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author | Vincent Sanders <vince@netsurf-browser.org> | 2018-05-10 11:34:26 +0100 |
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committer | Vincent Sanders <vince@kyllikki.org> | 2018-05-10 13:37:02 +0100 |
commit | 2a03ea30490892ac52b3da325ab78e1aa888f83e (patch) | |
tree | d041e4a2aab3b224ad41612d47ea2119895e27ac /render/layout.c | |
parent | 1b892391d7859398c212b9fda5b532308fa6e8fd (diff) | |
download | netsurf-2a03ea30490892ac52b3da325ab78e1aa888f83e.tar.gz netsurf-2a03ea30490892ac52b3da325ab78e1aa888f83e.tar.bz2 |
move html and text content handlers where they belong
Diffstat (limited to 'render/layout.c')
-rw-r--r-- | render/layout.c | 5432 |
1 files changed, 0 insertions, 5432 deletions
diff --git a/render/layout.c b/render/layout.c deleted file mode 100644 index 121137adc..000000000 --- a/render/layout.c +++ /dev/null @@ -1,5432 +0,0 @@ -/* - * Copyright 2005 Richard Wilson <info@tinct.net> - * Copyright 2006 James Bursa <bursa@users.sourceforge.net> - * Copyright 2008 Michael Drake <tlsa@netsurf-browser.org> - * Copyright 2003 Phil Mellor <monkeyson@users.sourceforge.net> - * - * This file is part of NetSurf, http://www.netsurf-browser.org/ - * - * NetSurf is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; version 2 of the License. - * - * NetSurf is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program. If not, see <http://www.gnu.org/licenses/>. - */ - -/** - * \file - * HTML layout implementation. - * - * Layout is carried out in two stages: - * - * 1. + calculation of minimum / maximum box widths, and - * + determination of whether block level boxes will have >zero height - * - * 2. + layout (position and dimensions) - * - * In most cases the functions for the two stages are a corresponding pair - * layout_minmax_X() and layout_X(). - */ - -#include <assert.h> -#include <limits.h> -#include <stdbool.h> -#include <stdio.h> -#include <stdlib.h> -#include <string.h> -#include <math.h> -#include <dom/dom.h> - -#include "utils/log.h" -#include "utils/talloc.h" -#include "utils/utils.h" -#include "utils/nsoption.h" -#include "netsurf/inttypes.h" -#include "netsurf/content.h" -#include "netsurf/browser_window.h" -#include "netsurf/layout.h" -#include "content/content_protected.h" -#include "css/utils.h" -#include "desktop/scrollbar.h" -#include "desktop/textarea.h" - -#include "render/box.h" -#include "render/font.h" -#include "render/form_internal.h" -#include "render/html_internal.h" -#include "render/layout.h" -#include "render/table.h" - -#define AUTO INT_MIN - -/* Fixed point percentage (a) of an integer (b), to an integer */ -#define FPCT_OF_INT_TOINT(a, b) (FIXTOINT(FDIV((a * b), F_100))) - -typedef uint8_t (*css_len_func)( - const css_computed_style *style, - css_fixed *length, css_unit *unit); -typedef uint8_t (*css_border_style_func)( - const css_computed_style *style); -typedef uint8_t (*css_border_color_func)( - const css_computed_style *style, - css_color *color); - -/** Array of per-side access functions for computed style margins. */ -static const css_len_func margin_funcs[4] = { - [TOP] = css_computed_margin_top, - [RIGHT] = css_computed_margin_right, - [BOTTOM] = css_computed_margin_bottom, - [LEFT] = css_computed_margin_left, -}; - -/** Array of per-side access functions for computed style paddings. */ -static const css_len_func padding_funcs[4] = { - [TOP] = css_computed_padding_top, - [RIGHT] = css_computed_padding_right, - [BOTTOM] = css_computed_padding_bottom, - [LEFT] = css_computed_padding_left, -}; - -/** Array of per-side access functions for computed style border_widths. */ -static const css_len_func border_width_funcs[4] = { - [TOP] = css_computed_border_top_width, - [RIGHT] = css_computed_border_right_width, - [BOTTOM] = css_computed_border_bottom_width, - [LEFT] = css_computed_border_left_width, -}; - -/** Array of per-side access functions for computed style border styles. */ -static const css_border_style_func border_style_funcs[4] = { - [TOP] = css_computed_border_top_style, - [RIGHT] = css_computed_border_right_style, - [BOTTOM] = css_computed_border_bottom_style, - [LEFT] = css_computed_border_left_style, -}; - -/** Array of per-side access functions for computed style border colors. */ -static const css_border_color_func border_color_funcs[4] = { - [TOP] = css_computed_border_top_color, - [RIGHT] = css_computed_border_right_color, - [BOTTOM] = css_computed_border_bottom_color, - [LEFT] = css_computed_border_left_color, -}; - -/* forward declaration to break cycles */ -static bool layout_block_context( - struct box *block, - int viewport_height, - html_content *content); -static void layout_minmax_block( - struct box *block, - const struct gui_layout_table *font_func, - const html_content *content); - - -/** - * Compute the size of replaced boxes with auto dimensions, according to - * content. - * - * \param box Box with object - * \param width Width value in px or AUTO. If AUTO, updated to value in px. - * \param height Height value in px or AUTO. If AUTO, updated to value in px. - * \param min_width Box's min width, as given by layout_find_dimensions. - * \param max_width Box's max width, as given by layout_find_dimensions. - * \param min_height Box's min height, as given by layout_find_dimensions. - * \param max_height Box's max height, as given by layout_find_dimensions. - * - * See CSS 2.1 sections 10.3 and 10.6. - */ -static void -layout_get_object_dimensions(struct box *box, - int *width, int *height, - int min_width, int max_width, - int min_height, int max_height) -{ - assert(box->object != NULL); - assert(width != NULL && height != NULL); - - if (*width == AUTO && *height == AUTO) { - /* No given dimensions */ - - bool scaled = false; - int intrinsic_width = content_get_width(box->object); - int intrinsic_height = content_get_height(box->object); - - /* use intrinsic dimensions */ - *width = intrinsic_width; - *height = intrinsic_height; - - /* Deal with min/max-width first */ - if (min_width > 0 && min_width > *width) { - *width = min_width; - scaled = true; - } - if (max_width >= 0 && max_width < *width) { - *width = max_width; - scaled = true; - } - - if (scaled && (intrinsic_width != 0)) { - /* Update height */ - *height = (*width * intrinsic_height) / - intrinsic_width; - } - - scaled = false; - /* Deal with min/max-height */ - if (min_height > 0 && min_height > *height) { - *height = min_height; - scaled = true; - } - if (max_height >= 0 && max_height < *height) { - *height = max_height; - scaled = true; - } - - if (scaled && (intrinsic_height != 0)) { - /* Update width */ - *width = (*height * intrinsic_width) / - intrinsic_height; - } - - } else if (*width == AUTO) { - /* Have given height; width is calculated from the given height - * and ratio of intrinsic dimensions */ - int intrinsic_width = content_get_width(box->object); - int intrinsic_height = content_get_height(box->object); - - if (intrinsic_height != 0) - *width = (*height * intrinsic_width) / - intrinsic_height; - else - *width = intrinsic_width; - - if (min_width > 0 && min_width > *width) - *width = min_width; - if (max_width >= 0 && max_width < *width) - *width = max_width; - - } else if (*height == AUTO) { - /* Have given width; height is calculated from the given width - * and ratio of intrinsic dimensions */ - int intrinsic_width = content_get_width(box->object); - int intrinsic_height = content_get_height(box->object); - - if (intrinsic_width != 0) - *height = (*width * intrinsic_height) / - intrinsic_width; - else - *height = intrinsic_height; - } -} - - -/** - * Calculate the text-indent length. - * - * \param style style of block - * \param width width of containing block - * \return length of indent - */ -static int layout_text_indent( - const nscss_len_ctx *len_ctx, - const css_computed_style *style, int width) -{ - css_fixed value = 0; - css_unit unit = CSS_UNIT_PX; - - css_computed_text_indent(style, &value, &unit); - - if (unit == CSS_UNIT_PCT) { - return FPCT_OF_INT_TOINT(value, width); - } else { - return FIXTOINT(nscss_len2px(len_ctx, value, unit, style)); - } -} - - -/** - * Determine width of margin, borders, and padding on one side of a box. - * - * \param len_ctx CSS length conversion context for document - * \param style style to measure - * \param side side of box to measure - * \param margin whether margin width is required - * \param border whether border width is required - * \param padding whether padding width is required - * \param fixed increased by sum of fixed margin, border, and padding - * \param frac increased by sum of fractional margin and padding - */ -static void -calculate_mbp_width(const nscss_len_ctx *len_ctx, - const css_computed_style *style, - unsigned int side, - bool margin, - bool border, - bool padding, - int *fixed, - float *frac) -{ - css_fixed value = 0; - css_unit unit = CSS_UNIT_PX; - - assert(style); - - /* margin */ - if (margin) { - enum css_margin_e type; - - type = margin_funcs[side](style, &value, &unit); - if (type == CSS_MARGIN_SET) { - if (unit == CSS_UNIT_PCT) { - *frac += FIXTOINT(FDIV(value, F_100)); - } else { - *fixed += FIXTOINT(nscss_len2px(len_ctx, - value, unit, style)); - } - } - } - - /* border */ - if (border) { - if (border_style_funcs[side](style) != - CSS_BORDER_STYLE_NONE) { - border_width_funcs[side](style, &value, &unit); - - *fixed += FIXTOINT(nscss_len2px(len_ctx, - value, unit, style)); - } - } - - /* padding */ - if (padding) { - padding_funcs[side](style, &value, &unit); - if (unit == CSS_UNIT_PCT) { - *frac += FIXTOINT(FDIV(value, F_100)); - } else { - *fixed += FIXTOINT(nscss_len2px(len_ctx, - value, unit, style)); - } - } -} - - -/** - * Calculate minimum and maximum width of a table. - * - * \param table box of type TABLE - * \param font_func Font functions - * \param content The HTML content we are laying out. - * \post table->min_width and table->max_width filled in, - * 0 <= table->min_width <= table->max_width - */ -static void layout_minmax_table(struct box *table, - const struct gui_layout_table *font_func, - const html_content *content) -{ - unsigned int i, j; - int border_spacing_h = 0; - int table_min = 0, table_max = 0; - int extra_fixed = 0; - float extra_frac = 0; - struct column *col; - struct box *row_group, *row, *cell; - enum css_width_e wtype; - css_fixed value = 0; - css_unit unit = CSS_UNIT_PX; - - /* check if the widths have already been calculated */ - if (table->max_width != UNKNOWN_MAX_WIDTH) - return; - - if (table_calculate_column_types(&content->len_ctx, table) == false) { - NSLOG(netsurf, WARNING, - "Could not establish table column types."); - return; - } - col = table->col; - - /* start with 0 except for fixed-width columns */ - for (i = 0; i != table->columns; i++) { - if (col[i].type == COLUMN_WIDTH_FIXED) - col[i].min = col[i].max = col[i].width; - else - col[i].min = col[i].max = 0; - } - - /* border-spacing is used in the separated borders model */ - if (css_computed_border_collapse(table->style) == - CSS_BORDER_COLLAPSE_SEPARATE) { - css_fixed h = 0, v = 0; - css_unit hu = CSS_UNIT_PX, vu = CSS_UNIT_PX; - - css_computed_border_spacing(table->style, &h, &hu, &v, &vu); - - border_spacing_h = FIXTOINT(nscss_len2px(&content->len_ctx, - h, hu, table->style)); - } - - /* 1st pass: consider cells with colspan 1 only */ - for (row_group = table->children; row_group; row_group =row_group->next) - for (row = row_group->children; row; row = row->next) - for (cell = row->children; cell; cell = cell->next) { - assert(cell->type == BOX_TABLE_CELL); - assert(cell->style); - /** TODO: Handle colspan="0" correctly. - * It's currently converted to 1 in box normaisation */ - assert(cell->columns != 0); - - if (cell->columns != 1) - continue; - - layout_minmax_block(cell, font_func, content); - i = cell->start_column; - - if (col[i].positioned) - continue; - - /* update column min, max widths using cell widths */ - if (col[i].min < cell->min_width) - col[i].min = cell->min_width; - if (col[i].max < cell->max_width) - col[i].max = cell->max_width; - } - - /* 2nd pass: cells which span multiple columns */ - for (row_group = table->children; row_group; row_group =row_group->next) - for (row = row_group->children; row; row = row->next) - for (cell = row->children; cell; cell = cell->next) { - unsigned int flexible_columns = 0; - int min = 0, max = 0, fixed_width = 0, extra; - - if (cell->columns == 1) - continue; - - layout_minmax_block(cell, font_func, content); - i = cell->start_column; - - /* find min width so far of spanned columns, and count - * number of non-fixed spanned columns and total fixed width */ - for (j = 0; j != cell->columns; j++) { - min += col[i + j].min; - if (col[i + j].type == COLUMN_WIDTH_FIXED) - fixed_width += col[i + j].width; - else - flexible_columns++; - } - min += (cell->columns - 1) * border_spacing_h; - - /* distribute extra min to spanned columns */ - if (min < cell->min_width) { - if (flexible_columns == 0) { - extra = 1 + (cell->min_width - min) / - cell->columns; - for (j = 0; j != cell->columns; j++) { - col[i + j].min += extra; - if (col[i + j].max < col[i + j].min) - col[i + j].max = col[i + j].min; - } - } else { - extra = 1 + (cell->min_width - min) / - flexible_columns; - for (j = 0; j != cell->columns; j++) { - if (col[i + j].type != - COLUMN_WIDTH_FIXED) { - col[i + j].min += extra; - if (col[i + j].max < - col[i + j].min) - col[i + j].max = - col[i + j].min; - } - } - } - } - - /* find max width so far of spanned columns */ - for (j = 0; j != cell->columns; j++) - max += col[i + j].max; - max += (cell->columns - 1) * border_spacing_h; - - /* distribute extra max to spanned columns */ - if (max < cell->max_width && flexible_columns) { - extra = 1 + (cell->max_width - max) / flexible_columns; - for (j = 0; j != cell->columns; j++) - if (col[i + j].type != COLUMN_WIDTH_FIXED) - col[i + j].max += extra; - } - } - - for (i = 0; i != table->columns; i++) { - if (col[i].max < col[i].min) { - box_dump(stderr, table, 0, true); - assert(0); - } - table_min += col[i].min; - table_max += col[i].max; - } - - /* fixed width takes priority, unless it is too narrow */ - wtype = css_computed_width(table->style, &value, &unit); - if (wtype == CSS_WIDTH_SET && unit != CSS_UNIT_PCT) { - int width = FIXTOINT(nscss_len2px(&content->len_ctx, - value, unit, table->style)); - if (table_min < width) - table_min = width; - if (table_max < width) - table_max = width; - } - - /* add margins, border, padding to min, max widths */ - calculate_mbp_width(&content->len_ctx, - table->style, LEFT, true, true, true, - &extra_fixed, &extra_frac); - calculate_mbp_width(&content->len_ctx, - table->style, RIGHT, true, true, true, - &extra_fixed, &extra_frac); - if (extra_fixed < 0) - extra_fixed = 0; - if (extra_frac < 0) - extra_frac = 0; - if (1.0 <= extra_frac) - extra_frac = 0.9; - table->min_width = (table_min + extra_fixed) / (1.0 - extra_frac); - table->max_width = (table_max + extra_fixed) / (1.0 - extra_frac); - table->min_width += (table->columns + 1) * border_spacing_h; - table->max_width += (table->columns + 1) * border_spacing_h; - - assert(0 <= table->min_width && table->min_width <= table->max_width); -} - -/** - * Helper to check if a box has percentage max width. - * - * \param[in] b Box to check. - * \return true iff box has percnetage max width. - */ -static inline bool box_has_percentage_max_width(struct box *b) -{ - css_unit unit = CSS_UNIT_PX; - enum css_max_width_e type; - css_fixed value = 0; - - assert(b != NULL); - - type = css_computed_max_width(b->style, &value, &unit); - return ((type == CSS_MAX_WIDTH_SET) && (unit == CSS_UNIT_PCT)); -} - -/** - * Calculate minimum and maximum width of a line. - * - * \param first a box in an inline container - * \param line_min updated to minimum width of line starting at first - * \param line_max updated to maximum width of line starting at first - * \param first_line true iff this is the first line in the inline container - * \param line_has_height updated to true or false, depending on line - * \param font_func Font functions. - * \return first box in next line, or 0 if no more lines - * \post 0 <= *line_min <= *line_max - */ -static struct box * -layout_minmax_line(struct box *first, - int *line_min, - int *line_max, - bool first_line, - bool *line_has_height, - const struct gui_layout_table *font_func, - const html_content *content) -{ - int min = 0, max = 0, width, height, fixed; - float frac; - size_t i, j; - struct box *b; - struct box *block; - plot_font_style_t fstyle; - bool no_wrap; - - assert(first->parent); - assert(first->parent->parent); - assert(first->parent->parent->style); - - block = first->parent->parent; - no_wrap = (css_computed_white_space(block->style) == - CSS_WHITE_SPACE_NOWRAP || - css_computed_white_space(block->style) == - CSS_WHITE_SPACE_PRE); - - *line_has_height = false; - - /* corresponds to the pass 1 loop in layout_line() */ - for (b = first; b; b = b->next) { - enum css_width_e wtype; - enum css_height_e htype; - enum css_box_sizing_e bs; - css_fixed value = 0; - css_unit unit = CSS_UNIT_PX; - - assert(b->type == BOX_INLINE || b->type == BOX_INLINE_BLOCK || - b->type == BOX_FLOAT_LEFT || - b->type == BOX_FLOAT_RIGHT || - b->type == BOX_BR || b->type == BOX_TEXT || - b->type == BOX_INLINE_END); - - NSLOG(layout, DEBUG, "%p: min %i, max %i", b, min, max); - - if (b->type == BOX_BR) { - b = b->next; - break; - } - - if (b->type == BOX_FLOAT_LEFT || b->type == BOX_FLOAT_RIGHT) { - assert(b->children); - if (b->children->type == BOX_BLOCK) - layout_minmax_block(b->children, font_func, - content); - else - layout_minmax_table(b->children, font_func, - content); - b->min_width = b->children->min_width; - b->max_width = b->children->max_width; - if (min < b->min_width) - min = b->min_width; - max += b->max_width; - continue; - } - - if (b->type == BOX_INLINE_BLOCK) { - layout_minmax_block(b, font_func, content); - if (min < b->min_width) - min = b->min_width; - max += b->max_width; - - if (b->flags & HAS_HEIGHT) - *line_has_height = true; - continue; - } - - assert(b->style); - font_plot_style_from_css(&content->len_ctx, b->style, &fstyle); - - if (b->type == BOX_INLINE && !b->object && - !(b->flags & REPLACE_DIM) && - !(b->flags & IFRAME)) { - fixed = frac = 0; - calculate_mbp_width(&content->len_ctx, - b->style, LEFT, true, true, true, - &fixed, &frac); - if (!b->inline_end) - calculate_mbp_width(&content->len_ctx, - b->style, RIGHT, - true, true, true, - &fixed, &frac); - if (0 < fixed) - max += fixed; - *line_has_height = true; - /* \todo update min width, consider fractional extra */ - } else if (b->type == BOX_INLINE_END) { - fixed = frac = 0; - calculate_mbp_width(&content->len_ctx, - b->inline_end->style, RIGHT, - true, true, true, - &fixed, &frac); - if (0 < fixed) - max += fixed; - - if (b->next) { - if (b->space == UNKNOWN_WIDTH) { - font_func->width(&fstyle, " ", 1, - &b->space); - } - max += b->space; - } - - *line_has_height = true; - continue; - } - - if (!b->object && !(b->flags & IFRAME) && !b->gadget && - !(b->flags & REPLACE_DIM)) { - /* inline non-replaced, 10.3.1 and 10.6.1 */ - bool no_wrap_box; - if (!b->text) - continue; - - no_wrap_box = (css_computed_white_space(b->style) == - CSS_WHITE_SPACE_NOWRAP || - css_computed_white_space(b->style) == - CSS_WHITE_SPACE_PRE); - - if (b->width == UNKNOWN_WIDTH) { - /** \todo handle errors */ - - /* If it's a select element, we must use the - * width of the widest option text */ - if (b->parent->parent->gadget && - b->parent->parent->gadget->type - == GADGET_SELECT) { - int opt_maxwidth = 0; - struct form_option *o; - - for (o = b->parent->parent->gadget-> - data.select.items; o; - o = o->next) { - int opt_width; - font_func->width(&fstyle, - o->text, - strlen(o->text), - &opt_width); - - if (opt_maxwidth < opt_width) - opt_maxwidth =opt_width; - } - - b->width = opt_maxwidth; - if (nsoption_bool(core_select_menu)) - b->width += SCROLLBAR_WIDTH; - - } else { - font_func->width(&fstyle, b->text, - b->length, &b->width); - b->flags |= MEASURED; - } - } - max += b->width; - if (b->next) { - if (b->space == UNKNOWN_WIDTH) { - font_func->width(&fstyle, " ", 1, - &b->space); - } - max += b->space; - } - - if (no_wrap) { - /* Don't wrap due to block style, - * so min is the same as max */ - min = max; - - } else if (no_wrap_box) { - /* This inline box can't be wrapped, - * for min, consider box's width */ - if (min < b->width) - min = b->width; - - } else if (b->parent->flags & NEED_MIN) { - /* If we care what the minimum width is, - * calculate it. (It's only needed if we're - * shrinking-to-fit.) */ - /* min = widest single word */ - i = 0; - do { - for (j = i; j != b->length && - b->text[j] != ' '; j++) - ; - font_func->width(&fstyle, b->text + i, - j - i, &width); - if (min < width) - min = width; - i = j + 1; - } while (j != b->length); - } - - *line_has_height = true; - - continue; - } - - /* inline replaced, 10.3.2 and 10.6.2 */ - assert(b->style); - - /* calculate box width */ - wtype = css_computed_width(b->style, &value, &unit); - bs = css_computed_box_sizing(block->style); - if (wtype == CSS_WIDTH_SET) { - if (unit == CSS_UNIT_PCT) { - width = AUTO; - } else { - width = FIXTOINT(nscss_len2px(&content->len_ctx, - value, unit, b->style)); - - if (bs == CSS_BOX_SIZING_BORDER_BOX) { - fixed = frac = 0; - calculate_mbp_width(&content->len_ctx, - block->style, LEFT, - false, true, true, - &fixed, &frac); - calculate_mbp_width(&content->len_ctx, - block->style, RIGHT, - false, true, true, - &fixed, &frac); - if (width < fixed) { - width = fixed; - } - } - if (width < 0) - width = 0; - } - } else { - width = AUTO; - } - - /* height */ - htype = css_computed_height(b->style, &value, &unit); - if (htype == CSS_HEIGHT_SET) { - height = FIXTOINT(nscss_len2px(&content->len_ctx, - value, unit, b->style)); - } else { - height = AUTO; - } - - if (b->object || (b->flags & REPLACE_DIM)) { - if (b->object) { - int temp_height = height; - layout_get_object_dimensions(b, - &width, &temp_height, - INT_MIN, INT_MAX, - INT_MIN, INT_MAX); - } - - fixed = frac = 0; - if (bs == CSS_BOX_SIZING_BORDER_BOX) { - calculate_mbp_width(&content->len_ctx, - b->style, LEFT, - true, false, false, - &fixed, &frac); - calculate_mbp_width(&content->len_ctx, - b->style, RIGHT, - true, false, false, - &fixed, &frac); - } else { - calculate_mbp_width(&content->len_ctx, - b->style, LEFT, - true, true, true, - &fixed, &frac); - calculate_mbp_width(&content->len_ctx, - b->style, RIGHT, - true, true, true, - &fixed, &frac); - } - if (0 < width + fixed) - width += fixed; - } else if (b->flags & IFRAME) { - /* TODO: handle percentage widths properly */ - if (width == AUTO) - width = 400; - - fixed = frac = 0; - if (bs == CSS_BOX_SIZING_BORDER_BOX) { - calculate_mbp_width(&content->len_ctx, - b->style, LEFT, - true, false, false, - &fixed, &frac); - calculate_mbp_width(&content->len_ctx, - b->style, RIGHT, - true, false, false, - &fixed, &frac); - } else { - calculate_mbp_width(&content->len_ctx, - b->style, LEFT, - true, true, true, - &fixed, &frac); - calculate_mbp_width(&content->len_ctx, - b->style, RIGHT, - true, true, true, - &fixed, &frac); - } - - if (0 < width + fixed) - width += fixed; - - } else { - /* form control with no object */ - if (width == AUTO) - width = FIXTOINT(nscss_len2px( - &content->len_ctx, - INTTOFIX(1), CSS_UNIT_EM, - b->style)); - } - - if (min < width && !box_has_percentage_max_width(b)) - min = width; - if (width > 0) - max += width; - - *line_has_height = true; - } - - if (first_line) { - /* todo: handle percentage values properly */ - /* todo: handle text-indent interaction with floats */ - int text_indent = layout_text_indent(&content->len_ctx, - first->parent->parent->style, 100); - min = (min + text_indent < 0) ? 0 : min + text_indent; - max = (max + text_indent < 0) ? 0 : max + text_indent; - } - - *line_min = min; - *line_max = max; - - NSLOG(layout, DEBUG, "line_min %i, line_max %i", min, max); - - assert(b != first); - assert(0 <= *line_min); - assert(*line_min <= *line_max); - return b; -} - - -/** - * Calculate minimum and maximum width of an inline container. - * - * \param inline_container box of type INLINE_CONTAINER - * \param[out] has_height set to true if container has height - * \param font_func Font functions. - * \post inline_container->min_width and inline_container->max_width filled in, - * 0 <= inline_container->min_width <= inline_container->max_width - */ -static void -layout_minmax_inline_container(struct box *inline_container, - bool *has_height, - const struct gui_layout_table *font_func, - const html_content *content) -{ - struct box *child; - int line_min = 0, line_max = 0; - int min = 0, max = 0; - bool first_line = true; - bool line_has_height; - - assert(inline_container->type == BOX_INLINE_CONTAINER); - - /* check if the widths have already been calculated */ - if (inline_container->max_width != UNKNOWN_MAX_WIDTH) - return; - - *has_height = false; - - for (child = inline_container->children; child; ) { - child = layout_minmax_line(child, &line_min, &line_max, - first_line, &line_has_height, font_func, - content); - if (min < line_min) - min = line_min; - if (max < line_max) - max = line_max; - first_line = false; - *has_height |= line_has_height; - } - - inline_container->min_width = min; - inline_container->max_width = max; - - assert(0 <= inline_container->min_width && - inline_container->min_width <= - inline_container->max_width); -} - - -/** - * Calculate minimum and maximum width of a block. - * - * \param block box of type BLOCK, INLINE_BLOCK, or TABLE_CELL - * \param font_func font functions - * \param content The HTML content being layed out. - * \post block->min_width and block->max_width filled in, - * 0 <= block->min_width <= block->max_width - */ -static void layout_minmax_block( - struct box *block, - const struct gui_layout_table *font_func, - const html_content *content) -{ - struct box *child; - int min = 0, max = 0; - int extra_fixed = 0; - float extra_frac = 0; - enum css_width_e wtype = CSS_WIDTH_AUTO; - css_fixed width = 0; - css_unit wunit = CSS_UNIT_PX; - enum css_height_e htype = CSS_HEIGHT_AUTO; - css_fixed height = 0; - css_unit hunit = CSS_UNIT_PX; - enum css_box_sizing_e bs = CSS_BOX_SIZING_CONTENT_BOX; - bool child_has_height = false; - - assert(block->type == BOX_BLOCK || - block->type == BOX_INLINE_BLOCK || - block->type == BOX_TABLE_CELL); - - /* check if the widths have already been calculated */ - if (block->max_width != UNKNOWN_MAX_WIDTH) - return; - - if (block->style != NULL) { - wtype = css_computed_width(block->style, &width, &wunit); - htype = css_computed_height(block->style, &height, &hunit); - bs = css_computed_box_sizing(block->style); - } - - /* set whether the minimum width is of any interest for this box */ - if (((block->parent && (block->parent->type == BOX_FLOAT_LEFT || - block->parent->type == BOX_FLOAT_RIGHT)) || - block->type == BOX_INLINE_BLOCK) && - wtype != CSS_WIDTH_SET) { - /* box shrinks to fit; need minimum width */ - block->flags |= NEED_MIN; - } else if (block->type == BOX_TABLE_CELL) { - /* box shrinks to fit; need minimum width */ - block->flags |= NEED_MIN; - } else if (block->parent && (block->parent->flags & NEED_MIN) && - wtype != CSS_WIDTH_SET) { - /* box inside shrink-to-fit context; need minimum width */ - block->flags |= NEED_MIN; - } - - if (block->gadget && (block->gadget->type == GADGET_TEXTBOX || - block->gadget->type == GADGET_PASSWORD || - block->gadget->type == GADGET_FILE || - block->gadget->type == GADGET_TEXTAREA) && - block->style && wtype == CSS_WIDTH_AUTO) { - css_fixed size = INTTOFIX(10); - css_unit unit = CSS_UNIT_EM; - - min = max = FIXTOINT(nscss_len2px(&content->len_ctx, - size, unit, block->style)); - - block->flags |= HAS_HEIGHT; - } - - if (block->gadget && (block->gadget->type == GADGET_RADIO || - block->gadget->type == GADGET_CHECKBOX) && - block->style && wtype == CSS_WIDTH_AUTO) { - css_fixed size = INTTOFIX(1); - css_unit unit = CSS_UNIT_EM; - - /* form checkbox or radio button - * if width is AUTO, set it to 1em */ - min = max = FIXTOINT(nscss_len2px(&content->len_ctx, - size, unit, block->style)); - - block->flags |= HAS_HEIGHT; - } - - if (block->object) { - if (content_get_type(block->object) == CONTENT_HTML) { - layout_minmax_block(html_get_box_tree(block->object), - font_func, content); - min = html_get_box_tree(block->object)->min_width; - max = html_get_box_tree(block->object)->max_width; - } else { - min = max = content_get_width(block->object); - } - - block->flags |= HAS_HEIGHT; - } else if (block->flags & IFRAME) { - /** \todo do we need to know the min/max width of the iframe's - * content? */ - block->flags |= HAS_HEIGHT; - } else { - /* recurse through children */ - for (child = block->children; child; child = child->next) { - switch (child->type) { - case BOX_BLOCK: - layout_minmax_block(child, font_func, - content); - if (child->flags & HAS_HEIGHT) - child_has_height = true; - break; - case BOX_INLINE_CONTAINER: - if (block->flags & NEED_MIN) - child->flags |= NEED_MIN; - - layout_minmax_inline_container(child, - &child_has_height, font_func, - content); - if (child_has_height && - child == - child->parent->children) { - block->flags |= MAKE_HEIGHT; - } - break; - case BOX_TABLE: - layout_minmax_table(child, font_func, - content); - /* todo: fix for zero height tables */ - child_has_height = true; - child->flags |= MAKE_HEIGHT; - break; - default: - assert(0); - } - assert(child->max_width != UNKNOWN_MAX_WIDTH); - - if (child->style && - (css_computed_position(child->style) == - CSS_POSITION_ABSOLUTE || - css_computed_position(child->style) == - CSS_POSITION_FIXED)) { - /* This child is positioned out of normal flow, - * so it will have no affect on width */ - continue; - } - - if (min < child->min_width) - min = child->min_width; - if (max < child->max_width) - max = child->max_width; - - if (child_has_height) - block->flags |= HAS_HEIGHT; - } - } - - if (max < min) { - box_dump(stderr, block, 0, true); - assert(0); - } - - /* fixed width takes priority */ - if (block->type != BOX_TABLE_CELL && wtype == CSS_WIDTH_SET && - wunit != CSS_UNIT_PCT) { - min = max = FIXTOINT(nscss_len2px(&content->len_ctx, - width, wunit, block->style)); - if (bs == CSS_BOX_SIZING_BORDER_BOX) { - int border_box_fixed = 0; - float border_box_frac = 0; - calculate_mbp_width(&content->len_ctx, - block->style, LEFT, - false, true, true, - &border_box_fixed, &border_box_frac); - calculate_mbp_width(&content->len_ctx, - block->style, RIGHT, - false, true, true, - &border_box_fixed, &border_box_frac); - if (min < border_box_fixed) { - min = max = border_box_fixed; - } - } - } - - if (htype == CSS_HEIGHT_SET && hunit != CSS_UNIT_PCT && - height > INTTOFIX(0)) { - block->flags |= MAKE_HEIGHT; - block->flags |= HAS_HEIGHT; - } - - /* add margins, border, padding to min, max widths */ - /* Note: we don't know available width here so percentage margin - * and paddings are wrong. */ - if (bs == CSS_BOX_SIZING_BORDER_BOX && wtype == CSS_WIDTH_SET) { - /* Border and padding included in width, so just get margin */ - calculate_mbp_width(&content->len_ctx, - block->style, LEFT, true, false, false, - &extra_fixed, &extra_frac); - calculate_mbp_width(&content->len_ctx, - block->style, RIGHT, true, false, false, - &extra_fixed, &extra_frac); - } else { - calculate_mbp_width(&content->len_ctx, - block->style, LEFT, true, true, true, - &extra_fixed, &extra_frac); - calculate_mbp_width(&content->len_ctx, - block->style, RIGHT, true, true, true, - &extra_fixed, &extra_frac); - } - if (extra_fixed < 0) - extra_fixed = 0; - if (extra_frac < 0) - extra_frac = 0; - if (1.0 <= extra_frac) - extra_frac = 0.9; - if (block->style != NULL && - (css_computed_float(block->style) == CSS_FLOAT_LEFT || - css_computed_float(block->style) == CSS_FLOAT_RIGHT)) { - /* floated boxs */ - block->min_width = min + extra_fixed; - block->max_width = max + extra_fixed; - } else { - /* not floated */ - block->min_width = (min + extra_fixed) / (1.0 - extra_frac); - block->max_width = (max + extra_fixed) / (1.0 - extra_frac); - } - - assert(0 <= block->min_width && block->min_width <= block->max_width); -} - - -/** - * Adjust a specified width or height for the box-sizing property. - * - * This turns the specified dimension into a content-box dimension. - * - * \param len_ctx Length conversion context - * \param box gadget to adjust dimensions of - * \param available_width width of containing block - * \param setwidth set true if the dimension to be tweaked is a width, - * else set false for a height - * \param dimension current value for given width/height dimension. - * updated to new value after consideration of - * gadget properties. - */ -static void layout_handle_box_sizing( - const nscss_len_ctx *len_ctx, - struct box *box, - int available_width, - bool setwidth, - int *dimension) -{ - enum css_box_sizing_e bs; - - assert(box && box->style); - - bs = css_computed_box_sizing(box->style); - - if (bs == CSS_BOX_SIZING_BORDER_BOX) { - int orig = *dimension; - int fixed = 0; - float frac = 0; - - calculate_mbp_width(len_ctx, box->style, - setwidth ? LEFT : TOP, - false, true, true, &fixed, &frac); - calculate_mbp_width(len_ctx, box->style, - setwidth ? RIGHT : BOTTOM, - false, true, true, &fixed, &frac); - orig -= frac * available_width + fixed; - *dimension = orig > 0 ? orig : 0; - } -} - - -/** - * Calculate width, height, and thickness of margins, paddings, and borders. - * - * \param len_ctx Length conversion context - * \param available_width width of containing block - * \param viewport_height height of viewport in pixels or -ve if unknown - * \param box current box - * \param style style giving width, height, margins, paddings, - * and borders - * \param width updated to width, may be NULL - * \param height updated to height, may be NULL - * \param max_width updated to max-width, may be NULL - * \param min_width updated to min-width, may be NULL - * \param max_height updated to max-height, may be NULL - * \param min_height updated to min-height, may be NULL - * \param margin filled with margins, may be NULL - * \param padding filled with paddings, may be NULL - * \param border filled with border widths, may be NULL - */ -static void -layout_find_dimensions(const nscss_len_ctx *len_ctx, - int available_width, - int viewport_height, - struct box *box, - const css_computed_style *style, - int *width, - int *height, - int *max_width, - int *min_width, - int *max_height, - int *min_height, - int margin[4], - int padding[4], - struct box_border border[4]) -{ - struct box *containing_block = NULL; - unsigned int i; - - if (width) { - enum css_width_e wtype; - css_fixed value = 0; - css_unit unit = CSS_UNIT_PX; - - wtype = css_computed_width(style, &value, &unit); - - if (wtype == CSS_WIDTH_SET) { - if (unit == CSS_UNIT_PCT) { - *width = FPCT_OF_INT_TOINT( - value, available_width); - } else { - *width = FIXTOINT(nscss_len2px(len_ctx, - value, unit, style)); - } - } else { - *width = AUTO; - } - - if (*width != AUTO) { - layout_handle_box_sizing(len_ctx, box, available_width, - true, width); - } - } - - if (height) { - enum css_height_e htype; - css_fixed value = 0; - css_unit unit = CSS_UNIT_PX; - - htype = css_computed_height(style, &value, &unit); - - if (htype == CSS_HEIGHT_SET) { - if (unit == CSS_UNIT_PCT) { - enum css_height_e cbhtype; - - if (css_computed_position(box->style) == - CSS_POSITION_ABSOLUTE && - box->parent) { - /* Box is absolutely positioned */ - assert(box->float_container); - containing_block = box->float_container; - } else if (box->float_container && - css_computed_position(box->style) != - CSS_POSITION_ABSOLUTE && - (css_computed_float(box->style) == - CSS_FLOAT_LEFT || - css_computed_float(box->style) == - CSS_FLOAT_RIGHT)) { - /* Box is a float */ - assert(box->parent && - box->parent->parent && - box->parent->parent->parent); - - containing_block = - box->parent->parent->parent; - } else if (box->parent && box->parent->type != - BOX_INLINE_CONTAINER) { - /* Box is a block level element */ - containing_block = box->parent; - } else if (box->parent && box->parent->type == - BOX_INLINE_CONTAINER) { - /* Box is an inline block */ - assert(box->parent->parent); - containing_block = box->parent->parent; - } - - if (containing_block) { - css_fixed f = 0; - css_unit u = CSS_UNIT_PX; - - cbhtype = css_computed_height( - containing_block->style, - &f, &u); - } - - if (containing_block && - containing_block->height != AUTO && - (css_computed_position(box->style) == - CSS_POSITION_ABSOLUTE || - cbhtype == CSS_HEIGHT_SET)) { - /* Box is absolutely positioned or its - * containing block has a valid - * specified height. - * (CSS 2.1 Section 10.5) */ - *height = FPCT_OF_INT_TOINT(value, - containing_block->height); - } else if ((!box->parent || - !box->parent->parent) && - viewport_height >= 0) { - /* If root element or it's child - * (HTML or BODY) */ - *height = FPCT_OF_INT_TOINT(value, - viewport_height); - } else { - /* precentage height not permissible - * treat height as auto */ - *height = AUTO; - } - } else { - *height = FIXTOINT(nscss_len2px(len_ctx, - value, unit, style)); - } - } else { - *height = AUTO; - } - - if (*height != AUTO) { - layout_handle_box_sizing(len_ctx, box, available_width, - false, height); - } - } - - if (max_width) { - enum css_max_width_e type; - css_fixed value = 0; - css_unit unit = CSS_UNIT_PX; - - type = css_computed_max_width(style, &value, &unit); - - if (type == CSS_MAX_WIDTH_SET) { - if (unit == CSS_UNIT_PCT) { - *max_width = FPCT_OF_INT_TOINT(value, - available_width); - } else { - *max_width = FIXTOINT(nscss_len2px(len_ctx, - value, unit, style)); - } - } else { - /* Inadmissible */ - *max_width = -1; - } - - if (*max_width != -1) { - layout_handle_box_sizing(len_ctx, box, available_width, - true, max_width); - } - } - - if (min_width) { - enum css_min_width_e type; - css_fixed value = 0; - css_unit unit = CSS_UNIT_PX; - - type = ns_computed_min_width(style, &value, &unit); - - if (type == CSS_MIN_WIDTH_SET) { - if (unit == CSS_UNIT_PCT) { - *min_width = FPCT_OF_INT_TOINT(value, - available_width); - } else { - *min_width = FIXTOINT(nscss_len2px(len_ctx, - value, unit, style)); - } - } else { - /* Inadmissible */ - *min_width = 0; - } - - if (*min_width != 0) { - layout_handle_box_sizing(len_ctx, box, available_width, - true, min_width); - } - } - - if (max_height) { - enum css_max_height_e type; - css_fixed value = 0; - css_unit unit = CSS_UNIT_PX; - - type = css_computed_max_height(style, &value, &unit); - - if (type == CSS_MAX_HEIGHT_SET) { - if (unit == CSS_UNIT_PCT) { - /* TODO: handle percentage */ - *max_height = -1; - } else { - *max_height = FIXTOINT(nscss_len2px(len_ctx, - value, unit, style)); - } - } else { - /* Inadmissible */ - *max_height = -1; - } - } - - if (min_height) { - enum css_min_height_e type; - css_fixed value = 0; - css_unit unit = CSS_UNIT_PX; - - type = ns_computed_min_height(style, &value, &unit); - - if (type == CSS_MIN_HEIGHT_SET) { - if (unit == CSS_UNIT_PCT) { - /* TODO: handle percentage */ - *min_height = 0; - } else { - *min_height = FIXTOINT(nscss_len2px(len_ctx, - value, unit, style)); - } - } else { - /* Inadmissible */ - *min_height = 0; - } - } - - for (i = 0; i != 4; i++) { - if (margin) { - enum css_margin_e type = CSS_MARGIN_AUTO; - css_fixed value = 0; - css_unit unit = CSS_UNIT_PX; - - type = margin_funcs[i](style, &value, &unit); - - if (type == CSS_MARGIN_SET) { - if (unit == CSS_UNIT_PCT) { - margin[i] = FPCT_OF_INT_TOINT(value, - available_width); - } else { - margin[i] = FIXTOINT(nscss_len2px( - len_ctx, - value, unit, style)); - } - } else { - margin[i] = AUTO; - } - } - - if (padding) { - css_fixed value = 0; - css_unit unit = CSS_UNIT_PX; - - padding_funcs[i](style, &value, &unit); - - if (unit == CSS_UNIT_PCT) { - padding[i] = FPCT_OF_INT_TOINT(value, - available_width); - } else { - padding[i] = FIXTOINT(nscss_len2px(len_ctx, - value, unit, style)); - } - } - - /* Table cell borders are populated in table.c */ - if (border && box->type != BOX_TABLE_CELL) { - enum css_border_style_e bstyle = CSS_BORDER_STYLE_NONE; - css_color color = 0; - css_fixed value = 0; - css_unit unit = CSS_UNIT_PX; - - border_width_funcs[i](style, &value, &unit); - bstyle = border_style_funcs[i](style); - border_color_funcs[i](style, &color); - - border[i].style = bstyle; - border[i].c = color; - - if (bstyle == CSS_BORDER_STYLE_HIDDEN || - bstyle == CSS_BORDER_STYLE_NONE) - /* spec unclear: following Mozilla */ - border[i].width = 0; - else - border[i].width = FIXTOINT(nscss_len2px(len_ctx, - value, unit, style)); - - /* Special case for border-collapse: make all borders - * on table/table-row-group/table-row zero width. */ - if (css_computed_border_collapse(style) == - CSS_BORDER_COLLAPSE_COLLAPSE && - (box->type == BOX_TABLE || - box->type == BOX_TABLE_ROW_GROUP || - box->type == BOX_TABLE_ROW)) - border[i].width = 0; - } - } -} - - -/** - * Find next block that current margin collapses to. - * - * \param len_ctx Length conversion context - * \param box box to start tree-order search from (top margin is included) - * \param block box responsible for current block fromatting context - * \param viewport_height height of viewport in px - * \param max_pos_margin updated to to maximum positive margin encountered - * \param max_neg_margin updated to to maximum negative margin encountered - * \return next box that current margin collapses to, or NULL if none. - */ -static struct box* -layout_next_margin_block(const nscss_len_ctx *len_ctx, - struct box *box, - struct box *block, - int viewport_height, - int *max_pos_margin, - int *max_neg_margin) -{ - assert(block != NULL); - - while (box != NULL) { - - if (box->type == BOX_INLINE_CONTAINER || (box->style && - (css_computed_position(box->style) != - CSS_POSITION_ABSOLUTE && - css_computed_position(box->style) != - CSS_POSITION_FIXED))) { - /* Not positioned */ - - /* Get margins */ - if (box->style) { - layout_find_dimensions(len_ctx, - box->parent->width, - viewport_height, box, - box->style, - NULL, NULL, NULL, NULL, - NULL, NULL, box->margin, - box->padding, box->border); - - /* Apply top margin */ - if (*max_pos_margin < box->margin[TOP]) - *max_pos_margin = box->margin[TOP]; - else if (*max_neg_margin < -box->margin[TOP]) - *max_neg_margin = -box->margin[TOP]; - } - - /* Check whether box is the box current margin collapses - * to */ - if (box->flags & MAKE_HEIGHT || - box->border[TOP].width || - box->padding[TOP] || - (box->style && - css_computed_overflow_y(box->style) != - CSS_OVERFLOW_VISIBLE) || - (box->type == BOX_INLINE_CONTAINER && - box != box->parent->children)) { - /* Collapse to this box; return it */ - return box; - } - } - - - /* Find next box */ - if (box->type == BOX_BLOCK && !box->object && box->children && - box->style && - css_computed_overflow_y(box->style) == - CSS_OVERFLOW_VISIBLE) { - /* Down into children. */ - box = box->children; - } else { - if (!box->next) { - /* No more siblings: - * Go up to first ancestor with a sibling. */ - do { - /* Apply bottom margin */ - if (*max_pos_margin < - box->margin[BOTTOM]) - *max_pos_margin = - box->margin[BOTTOM]; - else if (*max_neg_margin < - -box->margin[BOTTOM]) - *max_neg_margin = - -box->margin[BOTTOM]; - - box = box->parent; - } while (box != block && !box->next); - - if (box == block) { - /* Margins don't collapse with stuff - * outside the block formatting context - */ - return block; - } - } - - /* Apply bottom margin */ - if (*max_pos_margin < box->margin[BOTTOM]) - *max_pos_margin = box->margin[BOTTOM]; - else if (*max_neg_margin < -box->margin[BOTTOM]) - *max_neg_margin = -box->margin[BOTTOM]; - - /* To next sibling. */ - box = box->next; - - /* Get margins */ - if (box->style) { - layout_find_dimensions(len_ctx, - box->parent->width, - viewport_height, box, - box->style, - NULL, NULL, NULL, NULL, - NULL, NULL, box->margin, - box->padding, box->border); - } - } - } - - return NULL; -} - - -/** - * Find y coordinate which clears all floats on left and/or right. - * - * \param fl first float in float list - * \param clear type of clear - * \return y coordinate relative to ancestor box for floats - */ -static int layout_clear(struct box *fl, enum css_clear_e clear) -{ - int y = 0; - for (; fl; fl = fl->next_float) { - if ((clear == CSS_CLEAR_LEFT || clear == CSS_CLEAR_BOTH) && - fl->type == BOX_FLOAT_LEFT) - if (y < fl->y + fl->height) - y = fl->y + fl->height; - if ((clear == CSS_CLEAR_RIGHT || clear == CSS_CLEAR_BOTH) && - fl->type == BOX_FLOAT_RIGHT) - if (y < fl->y + fl->height) - y = fl->y + fl->height; - } - return y; -} - - -/** - * Find left and right edges in a vertical range. - * - * \param fl first float in float list - * \param y0 start of y range to search - * \param y1 end of y range to search - * \param x0 start left edge, updated to available left edge - * \param x1 start right edge, updated to available right edge - * \param left returns float on left if present - * \param right returns float on right if present - */ -static void -find_sides(struct box *fl, - int y0, int y1, - int *x0, int *x1, - struct box **left, - struct box **right) -{ - int fy0, fy1, fx0, fx1; - - NSLOG(layout, DEBUG, "y0 %i, y1 %i, x0 %i, x1 %i", y0, y1, *x0, *x1); - - *left = *right = 0; - for (; fl; fl = fl->next_float) { - fy1 = fl->y + fl->height; - if (fy1 < y0) { - /* Floats are sorted in order of decreasing bottom pos. - * Past here, all floats will be too high to concern us. - */ - return; - } - fy0 = fl->y; - if (y0 < fy1 && fy0 <= y1) { - if (fl->type == BOX_FLOAT_LEFT) { - fx1 = fl->x + fl->width; - if (*x0 < fx1) { - *x0 = fx1; - *left = fl; - } - } else { - fx0 = fl->x; - if (fx0 < *x1) { - *x1 = fx0; - *right = fl; - } - } - } - } - - NSLOG(layout, DEBUG, "x0 %i, x1 %i, left %p, right %p", *x0, *x1, - *left, *right); -} - - - - -/** - * Solve the width constraint as given in CSS 2.1 section 10.3.3. - * - * \param box Box to solve constraint for - * \param available_width Max width available in pixels - * \param width Current box width - * \param lm Min left margin required to avoid floats in px. - * zero if not applicable - * \param rm Min right margin required to avoid floats in px. - * zero if not applicable - * \param max_width Box max-width ( -ve means no max-width to apply) - * \param min_width Box min-width ( <=0 means no min-width to apply) - * \return New box width - * - * \post \a box's left/right margins will be updated. - */ -static int -layout_solve_width(struct box *box, - int available_width, - int width, - int lm, - int rm, - int max_width, - int min_width) -{ - bool auto_width = false; - - /* Increase specified left/right margins */ - if (box->margin[LEFT] != AUTO && box->margin[LEFT] < lm && - box->margin[LEFT] >= 0) - box->margin[LEFT] = lm; - if (box->margin[RIGHT] != AUTO && box->margin[RIGHT] < rm && - box->margin[RIGHT] >= 0) - box->margin[RIGHT] = rm; - - /* Find width */ - if (width == AUTO) { - int margin_left = box->margin[LEFT]; - int margin_right = box->margin[RIGHT]; - - if (margin_left == AUTO) { - margin_left = lm; - } - if (margin_right == AUTO) { - margin_right = rm; - } - - width = available_width - - (margin_left + box->border[LEFT].width + - box->padding[LEFT] + box->padding[RIGHT] + - box->border[RIGHT].width + margin_right); - width = width < 0 ? 0 : width; - auto_width = true; - } - - if (max_width >= 0 && width > max_width) { - /* max-width is admissable and width exceeds max-width */ - width = max_width; - auto_width = false; - } - - if (min_width > 0 && width < min_width) { - /* min-width is admissable and width is less than max-width */ - width = min_width; - auto_width = false; - } - - /* Width was auto, and unconstrained by min/max width, so we're done */ - if (auto_width) { - /* any other 'auto' become 0 or the minimum required values */ - if (box->margin[LEFT] == AUTO) { - box->margin[LEFT] = lm; - } - if (box->margin[RIGHT] == AUTO) { - box->margin[RIGHT] = rm; - } - return width; - } - - /* Width was not auto, or was constrained by min/max width - * Need to compute left/right margins */ - - /* HTML alignment (only applies to over-constrained boxes) */ - if (box->margin[LEFT] != AUTO && box->margin[RIGHT] != AUTO && - box->parent != NULL && box->parent->style != NULL) { - switch (css_computed_text_align(box->parent->style)) { - case CSS_TEXT_ALIGN_LIBCSS_RIGHT: - box->margin[LEFT] = AUTO; - box->margin[RIGHT] = 0; - break; - case CSS_TEXT_ALIGN_LIBCSS_CENTER: - box->margin[LEFT] = box->margin[RIGHT] = AUTO; - break; - case CSS_TEXT_ALIGN_LIBCSS_LEFT: - box->margin[LEFT] = 0; - box->margin[RIGHT] = AUTO; - break; - default: - /* Leave it alone; no HTML alignment */ - break; - } - } - - if (box->margin[LEFT] == AUTO && box->margin[RIGHT] == AUTO) { - /* make the margins equal, centering the element */ - box->margin[LEFT] = box->margin[RIGHT] = - (available_width - lm - rm - - (box->border[LEFT].width + box->padding[LEFT] + - width + box->padding[RIGHT] + - box->border[RIGHT].width)) / 2; - - if (box->margin[LEFT] < 0) { - box->margin[RIGHT] += box->margin[LEFT]; - box->margin[LEFT] = 0; - } - - box->margin[LEFT] += lm; - - } else if (box->margin[LEFT] == AUTO) { - box->margin[LEFT] = available_width - lm - - (box->border[LEFT].width + box->padding[LEFT] + - width + box->padding[RIGHT] + - box->border[RIGHT].width + box->margin[RIGHT]); - box->margin[LEFT] = box->margin[LEFT] < lm - ? lm : box->margin[LEFT]; - } else { - /* margin-right auto or "over-constrained" */ - box->margin[RIGHT] = available_width - rm - - (box->margin[LEFT] + box->border[LEFT].width + - box->padding[LEFT] + width + - box->padding[RIGHT] + - box->border[RIGHT].width); - } - - return width; -} - - -/** - * Compute dimensions of box, margins, paddings, and borders for a block-level - * element. - * - * \param len_ctx Length conversion context - * \param available_width Max width available in pixels - * \param viewport_height Height of viewport in pixels or -ve if unknown - * \param lm min left margin required to avoid floats in px. - * zero if not applicable - * \param rm min right margin required to avoid floats in px. - * zero if not applicable - * \param box box to find dimensions of. updated with new width, - * height, margins, borders and paddings - * - * See CSS 2.1 10.3.3, 10.3.4, 10.6.2, and 10.6.3. - */ -static void -layout_block_find_dimensions(const nscss_len_ctx *len_ctx, - int available_width, - int viewport_height, - int lm, - int rm, - struct box *box) -{ - int width, max_width, min_width; - int height, max_height, min_height; - int *margin = box->margin; - int *padding = box->padding; - struct box_border *border = box->border; - const css_computed_style *style = box->style; - - layout_find_dimensions(len_ctx, available_width, viewport_height, box, - style, &width, &height, &max_width, &min_width, - &max_height, &min_height, margin, padding, border); - - if (box->object && !(box->flags & REPLACE_DIM) && - content_get_type(box->object) != CONTENT_HTML) { - /* block-level replaced element, see 10.3.4 and 10.6.2 */ - layout_get_object_dimensions(box, &width, &height, - min_width, max_width, min_height, max_height); - } - - box->width = layout_solve_width(box, available_width, width, lm, rm, - max_width, min_width); - box->height = height; - - if (margin[TOP] == AUTO) - margin[TOP] = 0; - if (margin[BOTTOM] == AUTO) - margin[BOTTOM] = 0; -} - - -/** - * Manipulate a block's [RB]padding/height/width to accommodate scrollbars - * - * \param box Box to apply scrollbar space too. Must be BOX_BLOCK. - * \param which Which scrollbar to make space for. Must be RIGHT or BOTTOM. - */ -static void layout_block_add_scrollbar(struct box *box, int which) -{ - enum css_overflow_e overflow_x, overflow_y; - - assert(box->type == BOX_BLOCK && (which == RIGHT || which == BOTTOM)); - - if (box->style == NULL) - return; - - overflow_x = css_computed_overflow_x(box->style); - overflow_y = css_computed_overflow_y(box->style); - - if (which == BOTTOM && - (overflow_x == CSS_OVERFLOW_SCROLL || - overflow_x == CSS_OVERFLOW_AUTO || - (box->object && - content_get_type(box->object) == CONTENT_HTML))) { - /* make space for scrollbar, unless height is AUTO */ - if (box->height != AUTO && - (overflow_x == CSS_OVERFLOW_SCROLL || - box_hscrollbar_present(box))) { - box->padding[BOTTOM] += SCROLLBAR_WIDTH; - } - - } else if (which == RIGHT && - (overflow_y == CSS_OVERFLOW_SCROLL || - overflow_y == CSS_OVERFLOW_AUTO || - (box->object && - content_get_type(box->object) == CONTENT_HTML))) { - /* make space for scrollbars, unless width is AUTO */ - enum css_height_e htype; - css_fixed height = 0; - css_unit hunit = CSS_UNIT_PX; - htype = css_computed_height(box->style, &height, &hunit); - - if (which == RIGHT && box->width != AUTO && - htype == CSS_HEIGHT_SET && - (overflow_y == CSS_OVERFLOW_SCROLL || - box_vscrollbar_present(box))) { - box->width -= SCROLLBAR_WIDTH; - box->padding[RIGHT] += SCROLLBAR_WIDTH; - } - } -} - - -/** - * Moves the children of a box by a specified amount - * - * \param box top of tree of boxes - * \param x the amount to move children by horizontally - * \param y the amount to move children by vertically - */ -static void layout_move_children(struct box *box, int x, int y) -{ - assert(box); - - for (box = box->children; box; box = box->next) { - box->x += x; - box->y += y; - } -} - - -/** - * Layout a table. - * - * \param table table to layout - * \param available_width width of containing block - * \param content memory pool for any new boxes - * \return true on success, false on memory exhaustion - */ -static bool layout_table(struct box *table, int available_width, - html_content *content) -{ - unsigned int columns = table->columns; /* total columns */ - unsigned int i; - unsigned int *row_span; - int *excess_y; - int table_width, min_width = 0, max_width = 0; - int required_width = 0; - int x, remainder = 0, count = 0; - int table_height = 0; - int min_height = 0; - int *xs; /* array of column x positions */ - int auto_width; - int spare_width; - int relative_sum = 0; - int border_spacing_h = 0, border_spacing_v = 0; - int spare_height; - int positioned_columns = 0; - struct box *containing_block = NULL; - struct box *c; - struct box *row; - struct box *row_group; - struct box **row_span_cell; - struct column *col; - const css_computed_style *style = table->style; - enum css_width_e wtype; - enum css_height_e htype; - css_fixed value = 0; - css_unit unit = CSS_UNIT_PX; - - assert(table->type == BOX_TABLE); - assert(style); - assert(table->children && table->children->children); - assert(columns); - - /* allocate working buffers */ - col = malloc(columns * sizeof col[0]); - excess_y = malloc(columns * sizeof excess_y[0]); - row_span = malloc(columns * sizeof row_span[0]); - row_span_cell = malloc(columns * sizeof row_span_cell[0]); - xs = malloc((columns + 1) * sizeof xs[0]); - if (!col || !xs || !row_span || !excess_y || !row_span_cell) { - free(col); - free(excess_y); - free(row_span); - free(row_span_cell); - free(xs); - return false; - } - - memcpy(col, table->col, sizeof(col[0]) * columns); - - /* find margins, paddings, and borders for table and cells */ - layout_find_dimensions(&content->len_ctx, available_width, -1, table, - style, 0, 0, 0, 0, 0, 0, table->margin, table->padding, - table->border); - for (row_group = table->children; row_group; - row_group = row_group->next) { - for (row = row_group->children; row; row = row->next) { - for (c = row->children; c; c = c->next) { - enum css_overflow_e overflow_x; - enum css_overflow_e overflow_y; - - assert(c->style); - table_used_border_for_cell( - &content->len_ctx, c); - layout_find_dimensions(&content->len_ctx, - available_width, -1, c, - c->style, 0, 0, 0, 0, 0, 0, - 0, c->padding, c->border); - - overflow_x = css_computed_overflow_x(c->style); - overflow_y = css_computed_overflow_y(c->style); - - if (overflow_x == CSS_OVERFLOW_SCROLL || - overflow_x == - CSS_OVERFLOW_AUTO) { - c->padding[BOTTOM] += SCROLLBAR_WIDTH; - } - if (overflow_y == CSS_OVERFLOW_SCROLL || - overflow_y == - CSS_OVERFLOW_AUTO) { - c->padding[RIGHT] += SCROLLBAR_WIDTH; - } - } - } - } - - /* border-spacing is used in the separated borders model */ - if (css_computed_border_collapse(style) == - CSS_BORDER_COLLAPSE_SEPARATE) { - css_fixed h = 0, v = 0; - css_unit hu = CSS_UNIT_PX, vu = CSS_UNIT_PX; - - css_computed_border_spacing(style, &h, &hu, &v, &vu); - - border_spacing_h = FIXTOINT(nscss_len2px(&content->len_ctx, - h, hu, style)); - border_spacing_v = FIXTOINT(nscss_len2px(&content->len_ctx, - v, vu, style)); - } - - /* find specified table width, or available width if auto-width */ - wtype = css_computed_width(style, &value, &unit); - if (wtype == CSS_WIDTH_SET) { - if (unit == CSS_UNIT_PCT) { - table_width = FPCT_OF_INT_TOINT(value, available_width); - } else { - table_width = - FIXTOINT(nscss_len2px(&content->len_ctx, - value, unit, style)); - } - - /* specified width includes border */ - table_width -= table->border[LEFT].width + - table->border[RIGHT].width; - table_width = table_width < 0 ? 0 : table_width; - - auto_width = table_width; - } else { - table_width = AUTO; - auto_width = available_width - - ((table->margin[LEFT] == AUTO ? 0 : - table->margin[LEFT]) + - table->border[LEFT].width + - table->padding[LEFT] + - table->padding[RIGHT] + - table->border[RIGHT].width + - (table->margin[RIGHT] == AUTO ? 0 : - table->margin[RIGHT])); - } - - /* Find any table height specified within CSS/HTML */ - htype = css_computed_height(style, &value, &unit); - if (htype == CSS_HEIGHT_SET) { - if (unit == CSS_UNIT_PCT) { - /* This is the minimum height for the table - * (see 17.5.3) */ - if (css_computed_position(table->style) == - CSS_POSITION_ABSOLUTE) { - /* Table is absolutely positioned */ - assert(table->float_container); - containing_block = table->float_container; - } else if (table->float_container && - css_computed_position(table->style) != - CSS_POSITION_ABSOLUTE && - (css_computed_float(table->style) == - CSS_FLOAT_LEFT || - css_computed_float(table->style) == - CSS_FLOAT_RIGHT)) { - /* Table is a float */ - assert(table->parent && table->parent->parent && - table->parent->parent->parent); - containing_block = - table->parent->parent->parent; - } else if (table->parent && table->parent->type != - BOX_INLINE_CONTAINER) { - /* Table is a block level element */ - containing_block = table->parent; - } else if (table->parent && table->parent->type == - BOX_INLINE_CONTAINER) { - /* Table is an inline block */ - assert(table->parent->parent); - containing_block = table->parent->parent; - } - - if (containing_block) { - css_fixed ignored = 0; - - htype = css_computed_height( - containing_block->style, - &ignored, &unit); - } - - if (containing_block && - containing_block->height != AUTO && - (css_computed_position(table->style) == - CSS_POSITION_ABSOLUTE || - htype == CSS_HEIGHT_SET)) { - /* Table is absolutely positioned or its - * containing block has a valid specified - * height. (CSS 2.1 Section 10.5) */ - min_height = FPCT_OF_INT_TOINT(value, - containing_block->height); - } - } else { - /* This is the minimum height for the table - * (see 17.5.3) */ - min_height = FIXTOINT(nscss_len2px(&content->len_ctx, - value, unit, style)); - } - } - - /* calculate width required by cells */ - for (i = 0; i != columns; i++) { - - NSLOG(layout, DEBUG, - "table %p, column %u: type %s, width %i, min %i, max %i", - table, - i, - ((const char *[]){ - "UNKNOWN", - "FIXED", - "AUTO", - "PERCENT", - "RELATIVE", - })[col[i].type], - col[i].width, - col[i].min, - col[i].max); - - - if (col[i].positioned) { - positioned_columns++; - continue; - } else if (col[i].type == COLUMN_WIDTH_FIXED) { - if (col[i].width < col[i].min) - col[i].width = col[i].max = col[i].min; - else - col[i].min = col[i].max = col[i].width; - required_width += col[i].width; - } else if (col[i].type == COLUMN_WIDTH_PERCENT) { - int width = col[i].width * auto_width / 100; - required_width += col[i].min < width ? width : - col[i].min; - } else - required_width += col[i].min; - - NSLOG(layout, DEBUG, "required_width %i", required_width); - } - required_width += (columns + 1 - positioned_columns) * - border_spacing_h; - - NSLOG(layout, DEBUG, - "width %i, min %i, max %i, auto %i, required %i", table_width, - table->min_width, table->max_width, auto_width, required_width); - - if (auto_width < required_width) { - /* table narrower than required width for columns: - * treat percentage widths as maximums */ - for (i = 0; i != columns; i++) { - if (col[i].type == COLUMN_WIDTH_RELATIVE) - continue; - if (col[i].type == COLUMN_WIDTH_PERCENT) { - col[i].max = auto_width * col[i].width / 100; - if (col[i].max < col[i].min) - col[i].max = col[i].min; - } - min_width += col[i].min; - max_width += col[i].max; - } - } else { - /* take percentages exactly */ - for (i = 0; i != columns; i++) { - if (col[i].type == COLUMN_WIDTH_RELATIVE) - continue; - if (col[i].type == COLUMN_WIDTH_PERCENT) { - int width = auto_width * col[i].width / 100; - if (width < col[i].min) - width = col[i].min; - col[i].min = col[i].width = col[i].max = width; - col[i].type = COLUMN_WIDTH_FIXED; - } - min_width += col[i].min; - max_width += col[i].max; - } - } - - /* allocate relative widths */ - spare_width = auto_width; - for (i = 0; i != columns; i++) { - if (col[i].type == COLUMN_WIDTH_RELATIVE) - relative_sum += col[i].width; - else if (col[i].type == COLUMN_WIDTH_FIXED) - spare_width -= col[i].width; - else - spare_width -= col[i].min; - } - spare_width -= (columns + 1) * border_spacing_h; - if (relative_sum != 0) { - if (spare_width < 0) - spare_width = 0; - for (i = 0; i != columns; i++) { - if (col[i].type == COLUMN_WIDTH_RELATIVE) { - col[i].min = ceil(col[i].max = - (float) spare_width - * (float) col[i].width - / relative_sum); - min_width += col[i].min; - max_width += col[i].max; - } - } - } - min_width += (columns + 1) * border_spacing_h; - max_width += (columns + 1) * border_spacing_h; - - if (auto_width <= min_width) { - /* not enough space: minimise column widths */ - for (i = 0; i < columns; i++) { - col[i].width = col[i].min; - } - table_width = min_width; - } else if (max_width <= auto_width) { - /* more space than maximum width */ - if (table_width == AUTO) { - /* for auto-width tables, make columns max width */ - for (i = 0; i < columns; i++) { - col[i].width = col[i].max; - } - table_width = max_width; - } else { - /* for fixed-width tables, distribute the extra space - * too */ - unsigned int flexible_columns = 0; - for (i = 0; i != columns; i++) - if (col[i].type != COLUMN_WIDTH_FIXED) - flexible_columns++; - if (flexible_columns == 0) { - int extra = (table_width - max_width) / columns; - remainder = (table_width - max_width) - - (extra * columns); - for (i = 0; i != columns; i++) { - col[i].width = col[i].max + extra; - count -= remainder; - if (count < 0) { - col[i].width++; - count += columns; - } - } - - } else { - int extra = (table_width - max_width) / - flexible_columns; - remainder = (table_width - max_width) - - (extra * flexible_columns); - for (i = 0; i != columns; i++) - if (col[i].type != COLUMN_WIDTH_FIXED) { - col[i].width = col[i].max + - extra; - count -= remainder; - if (count < 0) { - col[i].width++; - count += flexible_columns; - } - } - } - } - } else { - /* space between min and max: fill it exactly */ - float scale = (float) (auto_width - min_width) / - (float) (max_width - min_width); - /* fprintf(stderr, "filling, scale %f\n", scale); */ - for (i = 0; i < columns; i++) { - col[i].width = col[i].min + (int) (0.5 + - (col[i].max - col[i].min) * scale); - } - table_width = auto_width; - } - - xs[0] = x = border_spacing_h; - for (i = 0; i != columns; i++) { - if (!col[i].positioned) - x += col[i].width + border_spacing_h; - xs[i + 1] = x; - row_span[i] = 0; - excess_y[i] = 0; - row_span_cell[i] = 0; - } - - /* position cells */ - table_height = border_spacing_v; - for (row_group = table->children; row_group; - row_group = row_group->next) { - int row_group_height = 0; - for (row = row_group->children; row; row = row->next) { - int row_height = 0; - - htype = css_computed_height(row->style, &value, &unit); - if (htype == CSS_HEIGHT_SET && unit != CSS_UNIT_PCT) { - row_height = FIXTOINT(nscss_len2px( - &content->len_ctx, - value, unit, row->style)); - } - for (c = row->children; c; c = c->next) { - assert(c->style); - c->width = xs[c->start_column + c->columns] - - xs[c->start_column] - - border_spacing_h - - c->border[LEFT].width - - c->padding[LEFT] - - c->padding[RIGHT] - - c->border[RIGHT].width; - c->float_children = 0; - c->cached_place_below_level = 0; - - c->height = AUTO; - if (!layout_block_context(c, -1, content)) { - free(col); - free(excess_y); - free(row_span); - free(row_span_cell); - free(xs); - return false; - } - /* warning: c->descendant_y0 and - * c->descendant_y1 used as temporary storage - * until after vertical alignment is complete */ - c->descendant_y0 = c->height; - c->descendant_y1 = c->padding[BOTTOM]; - - htype = css_computed_height(c->style, - &value, &unit); - - if (htype == CSS_HEIGHT_SET && - unit != CSS_UNIT_PCT) { - /* some sites use height="1" or similar - * to attempt to make cells as small as - * possible, so treat it as a minimum */ - int h = FIXTOINT(nscss_len2px( - &content->len_ctx, - value, unit, c->style)); - if (c->height < h) - c->height = h; - } - /* specified row height is treated as a minimum - */ - if (c->height < row_height) - c->height = row_height; - c->x = xs[c->start_column] + - c->border[LEFT].width; - c->y = c->border[TOP].width; - for (i = 0; i != c->columns; i++) { - row_span[c->start_column + i] = c->rows; - excess_y[c->start_column + i] = - c->border[TOP].width + - c->padding[TOP] + - c->height + - c->padding[BOTTOM] + - c->border[BOTTOM].width; - row_span_cell[c->start_column + i] = 0; - } - row_span_cell[c->start_column] = c; - c->padding[BOTTOM] = -border_spacing_v - - c->border[TOP].width - - c->padding[TOP] - - c->height - - c->border[BOTTOM].width; - } - for (i = 0; i != columns; i++) - if (row_span[i] != 0) - row_span[i]--; - else - row_span_cell[i] = 0; - if (row->next || row_group->next) { - /* row height is greatest excess of a cell - * which ends in this row */ - for (i = 0; i != columns; i++) - if (row_span[i] == 0 && row_height < - excess_y[i]) - row_height = excess_y[i]; - } else { - /* except in the last row */ - for (i = 0; i != columns; i++) - if (row_height < excess_y[i]) - row_height = excess_y[i]; - } - for (i = 0; i != columns; i++) { - if (row_height < excess_y[i]) - excess_y[i] -= row_height; - else - excess_y[i] = 0; - if (row_span_cell[i] != 0) - row_span_cell[i]->padding[BOTTOM] += - row_height + - border_spacing_v; - } - - row->x = 0; - row->y = row_group_height; - row->width = table_width; - row->height = row_height; - row_group_height += row_height + border_spacing_v; - } - row_group->x = 0; - row_group->y = table_height; - row_group->width = table_width; - row_group->height = row_group_height; - table_height += row_group_height; - } - /* Table height is either the height of the contents, or specified - * height if greater */ - table_height = max(table_height, min_height); - /** \todo distribute spare height over the row groups / rows / cells */ - - /* perform vertical alignment */ - for (row_group = table->children; row_group; - row_group = row_group->next) { - for (row = row_group->children; row; row = row->next) { - for (c = row->children; c; c = c->next) { - enum css_vertical_align_e vertical_align; - - /* unextended bottom padding is in - * c->descendant_y1, and unextended - * cell height is in c->descendant_y0 */ - spare_height = (c->padding[BOTTOM] - - c->descendant_y1) + - (c->height - c->descendant_y0); - - vertical_align = css_computed_vertical_align( - c->style, &value, &unit); - - switch (vertical_align) { - case CSS_VERTICAL_ALIGN_SUB: - case CSS_VERTICAL_ALIGN_SUPER: - case CSS_VERTICAL_ALIGN_TEXT_TOP: - case CSS_VERTICAL_ALIGN_TEXT_BOTTOM: - case CSS_VERTICAL_ALIGN_SET: - case CSS_VERTICAL_ALIGN_BASELINE: - /* todo: baseline alignment, for now - * just use ALIGN_TOP */ - case CSS_VERTICAL_ALIGN_TOP: - break; - case CSS_VERTICAL_ALIGN_MIDDLE: - c->padding[TOP] += spare_height / 2; - c->padding[BOTTOM] -= spare_height / 2; - layout_move_children(c, 0, - spare_height / 2); - break; - case CSS_VERTICAL_ALIGN_BOTTOM: - c->padding[TOP] += spare_height; - c->padding[BOTTOM] -= spare_height; - layout_move_children(c, 0, - spare_height); - break; - case CSS_VERTICAL_ALIGN_INHERIT: - assert(0); - break; - } - } - } - } - - /* Top and bottom margins of 'auto' are set to 0. CSS2.1 10.6.3 */ - if (table->margin[TOP] == AUTO) - table->margin[TOP] = 0; - if (table->margin[BOTTOM] == AUTO) - table->margin[BOTTOM] = 0; - - free(col); - free(excess_y); - free(row_span); - free(row_span_cell); - free(xs); - - table->width = table_width; - table->height = table_height; - - return true; -} - - -/** - * Manimpulate box height according to CSS min-height and max-height properties - * - * \param len_ctx CSS length conversion context for document. - * \param box block to modify with any min-height or max-height - * \param container containing block for absolutely positioned elements, or - * NULL for non absolutely positioned elements. - * \return whether the height has been changed - */ -static bool layout_apply_minmax_height( - const nscss_len_ctx *len_ctx, - struct box *box, - struct box *container) -{ - int h; - struct box *containing_block = NULL; - bool updated = false; - - /* Find containing block for percentage heights */ - if (box->style != NULL && css_computed_position(box->style) == - CSS_POSITION_ABSOLUTE) { - /* Box is absolutely positioned */ - assert(container); - containing_block = container; - } else if (box->float_container && box->style != NULL && - (css_computed_float(box->style) == CSS_FLOAT_LEFT || - css_computed_float(box->style) == CSS_FLOAT_RIGHT)) { - /* Box is a float */ - assert(box->parent && box->parent->parent && - box->parent->parent->parent); - containing_block = box->parent->parent->parent; - } else if (box->parent && box->parent->type != BOX_INLINE_CONTAINER) { - /* Box is a block level element */ - containing_block = box->parent; - } else if (box->parent && box->parent->type == BOX_INLINE_CONTAINER) { - /* Box is an inline block */ - assert(box->parent->parent); - containing_block = box->parent->parent; - } - - if (box->style) { - enum css_height_e htype = CSS_HEIGHT_AUTO; - css_fixed value = 0; - css_unit unit = CSS_UNIT_PX; - - if (containing_block) { - htype = css_computed_height(containing_block->style, - &value, &unit); - } - - /* max-height */ - if (css_computed_max_height(box->style, &value, &unit) == - CSS_MAX_HEIGHT_SET) { - if (unit == CSS_UNIT_PCT) { - if (containing_block && - containing_block->height != AUTO && - (css_computed_position(box->style) == - CSS_POSITION_ABSOLUTE || - htype == CSS_HEIGHT_SET)) { - /* Box is absolutely positioned or its - * containing block has a valid - * specified height. (CSS 2.1 - * Section 10.5) */ - h = FPCT_OF_INT_TOINT(value, - containing_block->height); - if (h < box->height) { - box->height = h; - updated = true; - } - } - } else { - h = FIXTOINT(nscss_len2px(len_ctx, - value, unit, box->style)); - if (h < box->height) { - box->height = h; - updated = true; - } - } - } - - /* min-height */ - if (ns_computed_min_height(box->style, &value, &unit) == - CSS_MIN_HEIGHT_SET) { - if (unit == CSS_UNIT_PCT) { - if (containing_block && - containing_block->height != AUTO && - (css_computed_position(box->style) == - CSS_POSITION_ABSOLUTE || - htype == CSS_HEIGHT_SET)) { - /* Box is absolutely positioned or its - * containing block has a valid - * specified height. (CSS 2.1 - * Section 10.5) */ - h = FPCT_OF_INT_TOINT(value, - containing_block->height); - if (h > box->height) { - box->height = h; - updated = true; - } - } - } else { - h = FIXTOINT(nscss_len2px(len_ctx, - value, unit, box->style)); - if (h > box->height) { - box->height = h; - updated = true; - } - } - } - } - return updated; -} - - -/** - * Layout a block which contains an object. - * - * \param block box of type BLOCK, INLINE_BLOCK, TABLE, or TABLE_CELL - * \return true on success, false on memory exhaustion - */ -static bool layout_block_object(struct box *block) -{ - assert(block); - assert(block->type == BOX_BLOCK || - block->type == BOX_INLINE_BLOCK || - block->type == BOX_TABLE || - block->type == BOX_TABLE_CELL); - assert(block->object); - - NSLOG(layout, DEBUG, "block %p, object %p, width %i", block, - hlcache_handle_get_url(block->object), block->width); - - if (content_get_type(block->object) == CONTENT_HTML) { - content_reformat(block->object, false, block->width, 1); - } else { - /* Non-HTML objects */ - /* this case handled already in - * layout_block_find_dimensions() */ - } - - return true; -} - - -/** - * Insert a float into a container. - * - * \param cont block formatting context block, used to contain float - * \param b box to add to float - * - * This sorts floats in order of descending bottom edges. - */ -static void add_float_to_container(struct box *cont, struct box *b) -{ - struct box *box = cont->float_children; - int b_bottom = b->y + b->height; - - assert(b->type == BOX_FLOAT_LEFT || b->type == BOX_FLOAT_RIGHT); - - if (box == NULL) { - /* No other float children */ - b->next_float = NULL; - cont->float_children = b; - return; - } else if (b_bottom >= box->y + box->height) { - /* Goes at start of list */ - b->next_float = cont->float_children; - cont->float_children = b; - } else { - struct box *prev = NULL; - while (box != NULL && b_bottom < box->y + box->height) { - prev = box; - box = box->next_float; - } - if (prev != NULL) { - b->next_float = prev->next_float; - prev->next_float = b; - } - } -} - - -/** - * Split a text box. - * - * \param content memory pool for any new boxes - * \param fstyle style for text in text box - * \param split_box box with text to split - * \param new_length new length for text in split_box, after splitting - * \param new_width new width for text in split_box, after splitting - * \return true on success, false on memory exhaustion - * - * A new box is created and inserted into the box tree after split_box, - * containing the text after new_length excluding the initial space character. - */ -static bool -layout_text_box_split(html_content *content, - plot_font_style_t *fstyle, - struct box *split_box, - size_t new_length, - int new_width) -{ - int space_width = split_box->space; - struct box *c2; - const struct gui_layout_table *font_func = content->font_func; - bool space = (split_box->text[new_length] == ' '); - int used_length = new_length + (space ? 1 : 0); - - if ((space && space_width == 0) || space_width == UNKNOWN_WIDTH) { - /* We're need to add a space, and we don't know how big - * it's to be, OR we have a space of unknown width anyway; - * Calculate space width */ - font_func->width(fstyle, " ", 1, &space_width); - } - - if (split_box->space == UNKNOWN_WIDTH) - split_box->space = space_width; - if (!space) - space_width = 0; - - /* Create clone of split_box, c2 */ - c2 = talloc_memdup(content->bctx, split_box, sizeof *c2); - if (!c2) - return false; - c2->flags |= CLONE; - - /* Set remaining text in c2 */ - c2->text += used_length; - - /* Set c2 according to the remaining text */ - c2->width -= new_width + space_width; - c2->flags &= ~MEASURED; /* width has been estimated */ - c2->length = split_box->length - used_length; - - /* Update split_box for its reduced text */ - split_box->width = new_width; - split_box->flags |= MEASURED; - split_box->length = new_length; - split_box->space = space_width; - - /* Insert c2 into box list */ - c2->next = split_box->next; - split_box->next = c2; - c2->prev = split_box; - if (c2->next) - c2->next->prev = c2; - else - c2->parent->last = c2; - - NSLOG(layout, DEBUG, - "split_box %p len: %" PRIsizet " \"%.*s\"", - split_box, - split_box->length, - (int)split_box->length, - split_box->text); - NSLOG(layout, DEBUG, - " new_box %p len: %" PRIsizet " \"%.*s\"", - c2, - c2->length, - (int)c2->length, - c2->text); - - return true; -} - - -/** - * Compute dimensions of box, margins, paddings, and borders for a floating - * element using shrink-to-fit. Also used for inline-blocks. - * - * \param len_ctx CSS length conversion context for document. - * \param available_width Max width available in pixels - * \param style Box's style - * \param box Box for which to find dimensions - * Box margins, borders, paddings, width and - * height are updated. - */ -static void -layout_float_find_dimensions( - const nscss_len_ctx *len_ctx, - int available_width, - const css_computed_style *style, - struct box *box) -{ - int width, height, max_width, min_width, max_height, min_height; - int *margin = box->margin; - int *padding = box->padding; - struct box_border *border = box->border; - enum css_overflow_e overflow_x = css_computed_overflow_x(style); - enum css_overflow_e overflow_y = css_computed_overflow_y(style); - int scrollbar_width_x = - (overflow_x == CSS_OVERFLOW_SCROLL || - overflow_x == CSS_OVERFLOW_AUTO) ? - SCROLLBAR_WIDTH : 0; - int scrollbar_width_y = - (overflow_y == CSS_OVERFLOW_SCROLL || - overflow_y == CSS_OVERFLOW_AUTO) ? - SCROLLBAR_WIDTH : 0; - - layout_find_dimensions(len_ctx, available_width, -1, box, style, - &width, &height, &max_width, &min_width, - &max_height, &min_height, margin, padding, border); - - if (margin[LEFT] == AUTO) - margin[LEFT] = 0; - if (margin[RIGHT] == AUTO) - margin[RIGHT] = 0; - - if (box->gadget == NULL) { - padding[RIGHT] += scrollbar_width_y; - padding[BOTTOM] += scrollbar_width_x; - } - - if (box->object && !(box->flags & REPLACE_DIM) && - content_get_type(box->object) != CONTENT_HTML) { - /* Floating replaced element, with intrinsic width or height. - * See 10.3.6 and 10.6.2 */ - layout_get_object_dimensions(box, &width, &height, - min_width, max_width, min_height, max_height); - } else if (box->gadget && (box->gadget->type == GADGET_TEXTBOX || - box->gadget->type == GADGET_PASSWORD || - box->gadget->type == GADGET_FILE || - box->gadget->type == GADGET_TEXTAREA)) { - css_fixed size = 0; - css_unit unit = CSS_UNIT_EM; - - /* Give sensible dimensions to gadgets, with auto width/height, - * that don't shrink to fit contained text. */ - assert(box->style); - - if (box->gadget->type == GADGET_TEXTBOX || - box->gadget->type == GADGET_PASSWORD || - box->gadget->type == GADGET_FILE) { - if (width == AUTO) { - size = INTTOFIX(10); - width = FIXTOINT(nscss_len2px(len_ctx, - size, unit, box->style)); - } - if (box->gadget->type == GADGET_FILE && - height == AUTO) { - size = FLTTOFIX(1.5); - height = FIXTOINT(nscss_len2px(len_ctx, - size, unit, box->style)); - } - } - if (box->gadget->type == GADGET_TEXTAREA) { - if (width == AUTO) { - size = INTTOFIX(10); - width = FIXTOINT(nscss_len2px(len_ctx, - size, unit, box->style)); - } - if (height == AUTO) { - size = INTTOFIX(4); - height = FIXTOINT(nscss_len2px(len_ctx, - size, unit, box->style)); - } - } - } else if (width == AUTO) { - /* CSS 2.1 section 10.3.5 */ - width = min(max(box->min_width, available_width), - box->max_width); - - /* width includes margin, borders and padding */ - if (width == available_width) { - width -= box->margin[LEFT] + box->border[LEFT].width + - box->padding[LEFT] + - box->padding[RIGHT] + - box->border[RIGHT].width + - box->margin[RIGHT]; - } else { - /* width was obtained from a min_width or max_width - * value, so need to use the same method for calculating - * mbp as was used in layout_minmax_block() */ - int fixed = 0; - float frac = 0; - calculate_mbp_width(len_ctx, box->style, LEFT, - true, true, true, &fixed, &frac); - calculate_mbp_width(len_ctx, box->style, RIGHT, - true, true, true, &fixed, &frac); - if (fixed < 0) - fixed = 0; - - width -= fixed; - } - - if (max_width >= 0 && width > max_width) width = max_width; - if (min_width > 0 && width < min_width) width = min_width; - - } else { - if (max_width >= 0 && width > max_width) width = max_width; - if (min_width > 0 && width < min_width) width = min_width; - width -= scrollbar_width_y; - } - - box->width = width; - box->height = height; - - if (margin[TOP] == AUTO) - margin[TOP] = 0; - if (margin[BOTTOM] == AUTO) - margin[BOTTOM] = 0; -} - - -/** - * Layout the contents of a float or inline block. - * - * \param b float or inline block box - * \param width available width - * \param content memory pool for any new boxes - * \return true on success, false on memory exhaustion - */ -static bool layout_float(struct box *b, int width, html_content *content) -{ - assert(b->type == BOX_TABLE || b->type == BOX_BLOCK || - b->type == BOX_INLINE_BLOCK); - layout_float_find_dimensions(&content->len_ctx, width, b->style, b); - if (b->type == BOX_TABLE) { - if (!layout_table(b, width, content)) - return false; - if (b->margin[LEFT] == AUTO) - b->margin[LEFT] = 0; - if (b->margin[RIGHT] == AUTO) - b->margin[RIGHT] = 0; - if (b->margin[TOP] == AUTO) - b->margin[TOP] = 0; - if (b->margin[BOTTOM] == AUTO) - b->margin[BOTTOM] = 0; - } else - return layout_block_context(b, -1, content); - return true; -} - - -/** - * Position a float in the first available space. - * - * \param c float box to position - * \param width available width - * \param cx x coordinate relative to cont to place float right of - * \param y y coordinate relative to cont to place float below - * \param cont ancestor box which defines horizontal space, for floats - */ -static void -place_float_below(struct box *c, int width, int cx, int y, struct box *cont) -{ - int x0, x1, yy; - struct box *left; - struct box *right; - - yy = y > cont->cached_place_below_level ? - y : cont->cached_place_below_level; - - NSLOG(layout, DEBUG, - "c %p, width %i, cx %i, y %i, cont %p", c, - width, cx, y, cont); - - do { - y = yy; - x0 = cx; - x1 = cx + width; - find_sides(cont->float_children, y, y + c->height, &x0, &x1, - &left, &right); - if (left != 0 && right != 0) { - yy = (left->y + left->height < - right->y + right->height ? - left->y + left->height : - right->y + right->height); - } else if (left == 0 && right != 0) { - yy = right->y + right->height; - } else if (left != 0 && right == 0) { - yy = left->y + left->height; - } - } while ((left != 0 || right != 0) && (c->width > x1 - x0)); - - if (c->type == BOX_FLOAT_LEFT) { - c->x = x0; - } else { - c->x = x1 - c->width; - } - c->y = y; - cont->cached_place_below_level = y; -} - - -/** - * Calculate line height from a style. - */ -static int line_height( - const nscss_len_ctx *len_ctx, - const css_computed_style *style) -{ - enum css_line_height_e lhtype; - css_fixed lhvalue = 0; - css_unit lhunit = CSS_UNIT_PX; - css_fixed line_height; - - assert(style); - - lhtype = css_computed_line_height(style, &lhvalue, &lhunit); - if (lhtype == CSS_LINE_HEIGHT_NORMAL) { - /* Normal => use a constant of 1.3 * font-size */ - lhvalue = FLTTOFIX(1.3); - lhtype = CSS_LINE_HEIGHT_NUMBER; - } - - if (lhtype == CSS_LINE_HEIGHT_NUMBER || - lhunit == CSS_UNIT_PCT) { - line_height = nscss_len2px(len_ctx, - lhvalue, CSS_UNIT_EM, style); - - if (lhtype != CSS_LINE_HEIGHT_NUMBER) - line_height = FDIV(line_height, F_100); - } else { - assert(lhunit != CSS_UNIT_PCT); - - line_height = nscss_len2px(len_ctx, - lhvalue, lhunit, style); - } - - return FIXTOINT(line_height); -} - - -/** - * Position a line of boxes in inline formatting context. - * - * \param first box at start of line - * \param width available width on input, updated with actual width on output - * (may be incorrect if the line gets split?) - * \param y coordinate of top of line, updated on exit to bottom - * \param cx coordinate of left of line relative to cont - * \param cy coordinate of top of line relative to cont - * \param cont ancestor box which defines horizontal space, for floats - * \param indent apply any first-line indent - * \param has_text_children at least one TEXT in the inline_container - * \param next_box updated to first box for next line, or 0 at end - * \param content memory pool for any new boxes - * \return true on success, false on memory exhaustion - */ -static bool -layout_line(struct box *first, - int *width, - int *y, - int cx, - int cy, - struct box *cont, - bool indent, - bool has_text_children, - html_content *content, - struct box **next_box) -{ - int height, used_height; - int x0 = 0; - int x1 = *width; - int x, h, x_previous; - int fy = cy; - struct box *left; - struct box *right; - struct box *b; - struct box *split_box = 0; - struct box *d; - struct box *br_box = 0; - bool move_y = false; - bool place_below = false; - int space_before = 0, space_after = 0; - unsigned int inline_count = 0; - unsigned int i; - const struct gui_layout_table *font_func = content->font_func; - plot_font_style_t fstyle; - - NSLOG(layout, DEBUG, - "first %p, first->text '%.*s', width %i, y %i, cx %i, cy %i", - first, - (int)first->length, - first->text, - *width, - *y, - cx, - cy); - - /* find sides at top of line */ - x0 += cx; - x1 += cx; - find_sides(cont->float_children, cy, cy, &x0, &x1, &left, &right); - x0 -= cx; - x1 -= cx; - - if (indent) - x0 += layout_text_indent(&content->len_ctx, - first->parent->parent->style, *width); - - if (x1 < x0) - x1 = x0; - - /* get minimum line height from containing block. - * this is the line-height if there are text children and also in the - * case of an initially empty text input */ - if (has_text_children || first->parent->parent->gadget) - used_height = height = line_height(&content->len_ctx, - first->parent->parent->style); - else - /* inline containers with no text are usually for layout and - * look better with no minimum line-height */ - used_height = height = 0; - - /* pass 1: find height of line assuming sides at top of line: loop - * body executed at least once - * keep in sync with the loop in layout_minmax_line() */ - - NSLOG(layout, DEBUG, "x0 %i, x1 %i, x1 - x0 %i", x0, x1, x1 - x0); - - - for (x = 0, b = first; x <= x1 - x0 && b != 0; b = b->next) { - int min_width, max_width, min_height, max_height; - - assert(b->type == BOX_INLINE || b->type == BOX_INLINE_BLOCK || - b->type == BOX_FLOAT_LEFT || - b->type == BOX_FLOAT_RIGHT || - b->type == BOX_BR || b->type == BOX_TEXT || - b->type == BOX_INLINE_END); - - - NSLOG(layout, DEBUG, "pass 1: b %p, x %i", b, x); - - - if (b->type == BOX_BR) - break; - - if (b->type == BOX_FLOAT_LEFT || b->type == BOX_FLOAT_RIGHT) - continue; - if (b->type == BOX_INLINE_BLOCK && - (css_computed_position(b->style) == - CSS_POSITION_ABSOLUTE || - css_computed_position(b->style) == - CSS_POSITION_FIXED)) - continue; - - assert(b->style != NULL); - font_plot_style_from_css(&content->len_ctx, b->style, &fstyle); - - x += space_after; - - if (b->type == BOX_INLINE_BLOCK) { - if (b->max_width != UNKNOWN_WIDTH) - if (!layout_float(b, *width, content)) - return false; - h = b->border[TOP].width + b->padding[TOP] + b->height + - b->padding[BOTTOM] + - b->border[BOTTOM].width; - if (height < h) - height = h; - x += b->margin[LEFT] + b->border[LEFT].width + - b->padding[LEFT] + b->width + - b->padding[RIGHT] + - b->border[RIGHT].width + - b->margin[RIGHT]; - space_after = 0; - continue; - } - - if (b->type == BOX_INLINE) { - /* calculate borders, margins, and padding */ - layout_find_dimensions(&content->len_ctx, - *width, -1, b, b->style, 0, 0, 0, 0, - 0, 0, b->margin, b->padding, b->border); - for (i = 0; i != 4; i++) - if (b->margin[i] == AUTO) - b->margin[i] = 0; - x += b->margin[LEFT] + b->border[LEFT].width + - b->padding[LEFT]; - if (b->inline_end) { - b->inline_end->margin[RIGHT] = b->margin[RIGHT]; - b->inline_end->padding[RIGHT] = - b->padding[RIGHT]; - b->inline_end->border[RIGHT] = - b->border[RIGHT]; - } else { - x += b->padding[RIGHT] + - b->border[RIGHT].width + - b->margin[RIGHT]; - } - } else if (b->type == BOX_INLINE_END) { - b->width = 0; - if (b->space == UNKNOWN_WIDTH) { - font_func->width(&fstyle, " ", 1, &b->space); - /** \todo handle errors */ - } - space_after = b->space; - - x += b->padding[RIGHT] + b->border[RIGHT].width + - b->margin[RIGHT]; - continue; - } - - if (!b->object && !(b->flags & IFRAME) && !b->gadget && - !(b->flags & REPLACE_DIM)) { - /* inline non-replaced, 10.3.1 and 10.6.1 */ - b->height = line_height(&content->len_ctx, - b->style ? b->style : - b->parent->parent->style); - if (height < b->height) - height = b->height; - - if (!b->text) { - b->width = 0; - space_after = 0; - continue; - } - - if (b->width == UNKNOWN_WIDTH) { - /** \todo handle errors */ - - /* If it's a select element, we must use the - * width of the widest option text */ - if (b->parent->parent->gadget && - b->parent->parent->gadget->type - == GADGET_SELECT) { - int opt_maxwidth = 0; - struct form_option *o; - - for (o = b->parent->parent->gadget-> - data.select.items; o; - o = o->next) { - int opt_width; - font_func->width(&fstyle, - o->text, - strlen(o->text), - &opt_width); - - if (opt_maxwidth < opt_width) - opt_maxwidth =opt_width; - } - b->width = opt_maxwidth; - if (nsoption_bool(core_select_menu)) - b->width += SCROLLBAR_WIDTH; - } else { - font_func->width(&fstyle, b->text, - b->length, &b->width); - b->flags |= MEASURED; - } - } - - /* If the current text has not been measured (i.e. its - * width was estimated after splitting), and it fits on - * the line, measure it properly, so next box is placed - * correctly. */ - if (b->text && (x + b->width < x1 - x0) && - !(b->flags & MEASURED) && - b->next) { - font_func->width(&fstyle, b->text, - b->length, &b->width); - b->flags |= MEASURED; - } - - x += b->width; - if (b->space == UNKNOWN_WIDTH) { - font_func->width(&fstyle, " ", 1, &b->space); - /** \todo handle errors */ - } - space_after = b->space; - continue; - } - - space_after = 0; - - /* inline replaced, 10.3.2 and 10.6.2 */ - assert(b->style); - - layout_find_dimensions(&content->len_ctx, - *width, -1, b, b->style, - &b->width, &b->height, - &max_width, &min_width, - &max_height, &min_height, - NULL, NULL, NULL); - - if (b->object && !(b->flags & REPLACE_DIM)) { - layout_get_object_dimensions(b, &b->width, &b->height, - min_width, max_width, - min_height, max_height); - } else if (b->flags & IFRAME) { - /* TODO: should we look at the content dimensions? */ - if (b->width == AUTO) - b->width = 400; - if (b->height == AUTO) - b->height = 300; - - /* We reformat the iframe browser window to new - * dimensions in pass 2 */ - } else { - /* form control with no object */ - if (b->width == AUTO) - b->width = FIXTOINT(nscss_len2px( - &content->len_ctx, INTTOFIX(1), - CSS_UNIT_EM, b->style)); - if (b->height == AUTO) - b->height = FIXTOINT(nscss_len2px( - &content->len_ctx, INTTOFIX(1), - CSS_UNIT_EM, b->style)); - } - - /* Reformat object to new box size */ - if (b->object && content_get_type(b->object) == CONTENT_HTML && - b->width != - content_get_available_width(b->object)) { - css_fixed value = 0; - css_unit unit = CSS_UNIT_PX; - enum css_height_e htype = css_computed_height(b->style, - &value, &unit); - - content_reformat(b->object, false, b->width, b->height); - - if (htype == CSS_HEIGHT_AUTO) - b->height = content_get_height(b->object); - } - - if (height < b->height) - height = b->height; - - x += b->width; - } - - /* find new sides using this height */ - x0 = cx; - x1 = cx + *width; - find_sides(cont->float_children, cy, cy + height, &x0, &x1, - &left, &right); - x0 -= cx; - x1 -= cx; - - if (indent) - x0 += layout_text_indent(&content->len_ctx, - first->parent->parent->style, *width); - - if (x1 < x0) - x1 = x0; - - space_after = space_before = 0; - - /* pass 2: place boxes in line: loop body executed at least once */ - - NSLOG(layout, DEBUG, "x0 %i, x1 %i, x1 - x0 %i", x0, x1, x1 - x0); - - for (x = x_previous = 0, b = first; x <= x1 - x0 && b; b = b->next) { - - NSLOG(layout, DEBUG, "pass 2: b %p, x %i", b, x); - - if (b->type == BOX_INLINE_BLOCK && - (css_computed_position(b->style) == - CSS_POSITION_ABSOLUTE || - css_computed_position(b->style) == - CSS_POSITION_FIXED)) { - b->x = x + space_after; - - } else if (b->type == BOX_INLINE || - b->type == BOX_INLINE_BLOCK || - b->type == BOX_TEXT || - b->type == BOX_INLINE_END) { - assert(b->width != UNKNOWN_WIDTH); - - x_previous = x; - x += space_after; - b->x = x; - - if ((b->type == BOX_INLINE && !b->inline_end) || - b->type == BOX_INLINE_BLOCK) { - b->x += b->margin[LEFT] + b->border[LEFT].width; - x = b->x + b->padding[LEFT] + b->width + - b->padding[RIGHT] + - b->border[RIGHT].width + - b->margin[RIGHT]; - } else if (b->type == BOX_INLINE) { - b->x += b->margin[LEFT] + b->border[LEFT].width; - x = b->x + b->padding[LEFT] + b->width; - } else if (b->type == BOX_INLINE_END) { - b->height = b->inline_end->height; - x += b->padding[RIGHT] + - b->border[RIGHT].width + - b->margin[RIGHT]; - } else { - x += b->width; - } - - space_before = space_after; - if (b->object || b->flags & REPLACE_DIM || - b->flags & IFRAME) - space_after = 0; - else if (b->text || b->type == BOX_INLINE_END) { - if (b->space == UNKNOWN_WIDTH) { - font_plot_style_from_css( - &content->len_ctx, - b->style, &fstyle); - /** \todo handle errors */ - font_func->width(&fstyle, " ", 1, - &b->space); - } - space_after = b->space; - } else { - space_after = 0; - } - split_box = b; - move_y = true; - inline_count++; - } else if (b->type == BOX_BR) { - b->x = x; - b->width = 0; - br_box = b; - b = b->next; - split_box = 0; - move_y = true; - break; - - } else { - /* float */ - NSLOG(layout, DEBUG, "float %p", b); - - d = b->children; - d->float_children = 0; - d->cached_place_below_level = 0; - b->float_container = d->float_container = cont; - - if (!layout_float(d, *width, content)) - return false; - - NSLOG(layout, DEBUG, - "%p : %d %d", - d, - d->margin[TOP], - d->border[TOP].width); - - d->x = d->margin[LEFT] + d->border[LEFT].width; - d->y = d->margin[TOP] + d->border[TOP].width; - b->width = d->margin[LEFT] + d->border[LEFT].width + - d->padding[LEFT] + d->width + - d->padding[RIGHT] + - d->border[RIGHT].width + - d->margin[RIGHT]; - b->height = d->margin[TOP] + d->border[TOP].width + - d->padding[TOP] + d->height + - d->padding[BOTTOM] + - d->border[BOTTOM].width + - d->margin[BOTTOM]; - - if (b->width > (x1 - x0) - x) - place_below = true; - if (d->style && (css_computed_clear(d->style) == - CSS_CLEAR_NONE || - (css_computed_clear(d->style) == - CSS_CLEAR_LEFT && left == 0) || - (css_computed_clear(d->style) == - CSS_CLEAR_RIGHT && - right == 0) || - (css_computed_clear(d->style) == - CSS_CLEAR_BOTH && - left == 0 && right == 0)) && - (!place_below || - (left == 0 && right == 0 && x == 0)) && - cy >= cont->clear_level && - cy >= cont->cached_place_below_level) { - /* + not cleared or, - * cleared and there are no floats to clear - * + fits without needing to be placed below or, - * this line is empty with no floats - * + current y, cy, is below the clear level - * - * Float affects current line */ - if (b->type == BOX_FLOAT_LEFT) { - b->x = cx + x0; - if (b->width > 0) - x0 += b->width; - left = b; - } else { - b->x = cx + x1 - b->width; - if (b->width > 0) - x1 -= b->width; - right = b; - } - b->y = cy; - } else { - /* cleared or doesn't fit on line */ - /* place below into next available space */ - int fcy = (cy > cont->clear_level) ? cy : - cont->clear_level; - fcy = (fcy > cont->cached_place_below_level) ? - fcy : - cont->cached_place_below_level; - fy = (fy > fcy) ? fy : fcy; - fy = (fy == cy) ? fy + height : fy; - - place_float_below(b, *width, cx, fy, cont); - fy = b->y; - if (d->style && ( - (css_computed_clear(d->style) == - CSS_CLEAR_LEFT && left != 0) || - (css_computed_clear(d->style) == - CSS_CLEAR_RIGHT && - right != 0) || - (css_computed_clear(d->style) == - CSS_CLEAR_BOTH && - (left != 0 || right != 0)))) { - /* to be cleared below existing - * floats */ - if (b->type == BOX_FLOAT_LEFT) - b->x = cx; - else - b->x = cx + *width - b->width; - - fcy = layout_clear(cont->float_children, - css_computed_clear(d->style)); - if (fcy > cont->clear_level) - cont->clear_level = fcy; - if (b->y < fcy) - b->y = fcy; - } - if (b->type == BOX_FLOAT_LEFT) - left = b; - else - right = b; - } - add_float_to_container(cont, b); - - split_box = 0; - } - } - - if (x1 - x0 < x && split_box) { - /* the last box went over the end */ - size_t split = 0; - int w; - bool no_wrap = css_computed_white_space( - split_box->style) == CSS_WHITE_SPACE_NOWRAP || - css_computed_white_space( - split_box->style) == CSS_WHITE_SPACE_PRE; - - x = x_previous; - - if (!no_wrap && - (split_box->type == BOX_INLINE || - split_box->type == BOX_TEXT) && - !split_box->object && - !(split_box->flags & REPLACE_DIM) && - !(split_box->flags & IFRAME) && - !split_box->gadget && split_box->text) { - - font_plot_style_from_css(&content->len_ctx, - split_box->style, &fstyle); - /** \todo handle errors */ - font_func->split(&fstyle, - split_box->text, - split_box->length, - x1 - x0 - x - space_before, - &split, - &w); - } - - /* split == 0 implies that text can't be split */ - - if (split == 0) - w = split_box->width; - - - NSLOG(layout, DEBUG, - "splitting: split_box %p \"%.*s\", spilt %zu, w %i, " - "left %p, right %p, inline_count %u", - split_box, - (int)split_box->length, - split_box->text, - split, - w, - left, - right, - inline_count); - - if ((split == 0 || x1 - x0 <= x + space_before + w) && - !left && !right && inline_count == 1) { - /* first word of box doesn't fit, but no floats and - * first box on line so force in */ - if (split == 0 || split == split_box->length) { - /* only one word in this box, or not text - * or white-space:nowrap */ - b = split_box->next; - } else { - /* cut off first word for this line */ - if (!layout_text_box_split(content, &fstyle, - split_box, split, w)) - return false; - b = split_box->next; - } - x += space_before + w; - - NSLOG(layout, DEBUG, "forcing"); - - } else if ((split == 0 || x1 - x0 <= x + space_before + w) && - inline_count == 1) { - /* first word of first box doesn't fit, but a float is - * taking some of the width so move below it */ - assert(left || right); - used_height = 0; - if (left) { - - NSLOG(layout, DEBUG, - "cy %i, left->y %i, left->height %i", - cy, - left->y, - left->height); - - used_height = left->y + left->height - cy + 1; - - NSLOG(layout, DEBUG, "used_height %i", - used_height); - - } - if (right && used_height < - right->y + right->height - cy + 1) - used_height = right->y + right->height - cy + 1; - - if (used_height < 0) - used_height = 0; - - b = split_box; - - NSLOG(layout, DEBUG, "moving below float"); - - } else if (split == 0 || x1 - x0 <= x + space_before + w) { - /* first word of box doesn't fit so leave box for next - * line */ - b = split_box; - - NSLOG(layout, DEBUG, "leaving for next line"); - - } else { - /* fit as many words as possible */ - assert(split != 0); - - NSLOG(layout, DEBUG, "'%.*s' %i %zu %i", - (int)split_box->length, split_box->text, - x1 - x0, split, w); - - if (split != split_box->length) { - if (!layout_text_box_split(content, &fstyle, - split_box, split, w)) - return false; - b = split_box->next; - } - x += space_before + w; - - NSLOG(layout, DEBUG, "fitting words"); - - } - move_y = true; - } - - /* set positions */ - switch (css_computed_text_align(first->parent->parent->style)) { - case CSS_TEXT_ALIGN_RIGHT: - case CSS_TEXT_ALIGN_LIBCSS_RIGHT: - x0 = x1 - x; - break; - case CSS_TEXT_ALIGN_CENTER: - case CSS_TEXT_ALIGN_LIBCSS_CENTER: - x0 = (x0 + (x1 - x)) / 2; - break; - case CSS_TEXT_ALIGN_LEFT: - case CSS_TEXT_ALIGN_LIBCSS_LEFT: - case CSS_TEXT_ALIGN_JUSTIFY: - /* leave on left */ - break; - case CSS_TEXT_ALIGN_DEFAULT: - /* None; consider text direction */ - switch (css_computed_direction(first->parent->parent->style)) { - case CSS_DIRECTION_LTR: - /* leave on left */ - break; - case CSS_DIRECTION_RTL: - x0 = x1 - x; - break; - } - break; - } - - for (d = first; d != b; d = d->next) { - d->flags &= ~NEW_LINE; - - if (d->type == BOX_INLINE_BLOCK && - (css_computed_position(d->style) == - CSS_POSITION_ABSOLUTE || - css_computed_position(d->style) == - CSS_POSITION_FIXED)) { - /* positioned inline-blocks: - * set static position (x,y) only, rest of positioning - * is handled later */ - d->x += x0; - d->y = *y; - continue; - } else if ((d->type == BOX_INLINE && - ((d->object || d->gadget) == false) && - !(d->flags & IFRAME) && - !(d->flags & REPLACE_DIM)) || - d->type == BOX_BR || - d->type == BOX_TEXT || - d->type == BOX_INLINE_END) { - /* regular (non-replaced) inlines */ - d->x += x0; - d->y = *y - d->padding[TOP]; - - if (d->type == BOX_TEXT && d->height > used_height) { - /* text */ - used_height = d->height; - } - } else if ((d->type == BOX_INLINE) || - d->type == BOX_INLINE_BLOCK) { - /* replaced inlines and inline-blocks */ - d->x += x0; - d->y = *y + d->border[TOP].width + d->margin[TOP]; - h = d->margin[TOP] + d->border[TOP].width + - d->padding[TOP] + d->height + - d->padding[BOTTOM] + - d->border[BOTTOM].width + - d->margin[BOTTOM]; - if (used_height < h) - used_height = h; - } - } - - first->flags |= NEW_LINE; - - assert(b != first || (move_y && 0 < used_height && (left || right))); - - /* handle vertical-align by adjusting box y values */ - /** \todo proper vertical alignment handling */ - for (d = first; d != b; d = d->next) { - if ((d->type == BOX_INLINE && d->inline_end) || - d->type == BOX_BR || - d->type == BOX_TEXT || - d->type == BOX_INLINE_END) { - css_fixed value = 0; - css_unit unit = CSS_UNIT_PX; - switch (css_computed_vertical_align(d->style, &value, - &unit)) { - case CSS_VERTICAL_ALIGN_SUPER: - case CSS_VERTICAL_ALIGN_TOP: - case CSS_VERTICAL_ALIGN_TEXT_TOP: - /* already at top */ - break; - case CSS_VERTICAL_ALIGN_SUB: - case CSS_VERTICAL_ALIGN_BOTTOM: - case CSS_VERTICAL_ALIGN_TEXT_BOTTOM: - d->y += used_height - d->height; - break; - default: - case CSS_VERTICAL_ALIGN_BASELINE: - d->y += 0.75 * (used_height - d->height); - break; - } - } - } - - /* handle clearance for br */ - if (br_box && css_computed_clear(br_box->style) != CSS_CLEAR_NONE) { - int clear_y = layout_clear(cont->float_children, - css_computed_clear(br_box->style)); - if (used_height < clear_y - cy) - used_height = clear_y - cy; - } - - if (move_y) - *y += used_height; - *next_box = b; - *width = x; /* return actual width */ - return true; -} - - -/** - * Layout lines of text or inline boxes with floats. - * - * \param box inline container box - * \param width horizontal space available - * \param cont ancestor box which defines horizontal space, for floats - * \param cx box position relative to cont - * \param cy box position relative to cont - * \param content memory pool for any new boxes - * \return true on success, false on memory exhaustion - */ -static bool layout_inline_container(struct box *inline_container, int width, - struct box *cont, int cx, int cy, html_content *content) -{ - bool first_line = true; - bool has_text_children; - struct box *c, *next; - int y = 0; - int curwidth,maxwidth = width; - - assert(inline_container->type == BOX_INLINE_CONTAINER); - - NSLOG(layout, DEBUG, - "inline_container %p, width %i, cont %p, cx %i, cy %i", - inline_container, - width, - cont, - cx, - cy); - - - has_text_children = false; - for (c = inline_container->children; c; c = c->next) { - bool is_pre = false; - - if (c->style) { - enum css_white_space_e whitespace; - - whitespace = css_computed_white_space(c->style); - - is_pre = (whitespace == CSS_WHITE_SPACE_PRE || - whitespace == CSS_WHITE_SPACE_PRE_LINE || - whitespace == CSS_WHITE_SPACE_PRE_WRAP); - } - - if ((!c->object && !(c->flags & REPLACE_DIM) && - !(c->flags & IFRAME) && - c->text && (c->length || is_pre)) || - c->type == BOX_BR) - has_text_children = true; - } - - /** \todo fix wrapping so that a box with horizontal scrollbar will - * shrink back to 'width' if no word is wider than 'width' (Or just set - * curwidth = width and have the multiword lines wrap to the min width) - */ - for (c = inline_container->children; c; ) { - - NSLOG(layout, DEBUG, "c %p", c); - - curwidth = inline_container->width; - if (!layout_line(c, &curwidth, &y, cx, cy + y, cont, first_line, - has_text_children, content, &next)) - return false; - maxwidth = max(maxwidth,curwidth); - c = next; - first_line = false; - } - - inline_container->width = maxwidth; - inline_container->height = y; - - return true; -} - - -/** - * Layout a block formatting context. - * - * \param block BLOCK, INLINE_BLOCK, or TABLE_CELL to layout - * \param viewport_height Height of viewport in pixels or -ve if unknown - * \param content Memory pool for any new boxes - * \return true on success, false on memory exhaustion - * - * This function carries out layout of a block and its children, as described - * in CSS 2.1 9.4.1. - */ -static bool -layout_block_context(struct box *block, - int viewport_height, - html_content *content) -{ - struct box *box; - int cx, cy; /**< current coordinates */ - int max_pos_margin = 0; - int max_neg_margin = 0; - int y = 0; - int lm, rm; - struct box *margin_collapse = NULL; - bool in_margin = false; - css_fixed gadget_size; - css_unit gadget_unit; /* Checkbox / radio buttons */ - - assert(block->type == BOX_BLOCK || - block->type == BOX_INLINE_BLOCK || - block->type == BOX_TABLE_CELL); - assert(block->width != UNKNOWN_WIDTH); - assert(block->width != AUTO); - - block->float_children = NULL; - block->cached_place_below_level = 0; - block->clear_level = 0; - - /* special case if the block contains an object */ - if (block->object) { - int temp_width = block->width; - if (!layout_block_object(block)) - return false; - layout_get_object_dimensions(block, &temp_width, - &block->height, INT_MIN, INT_MAX, - INT_MIN, INT_MAX); - return true; - } else if (block->flags & REPLACE_DIM) { - return true; - } - - /* special case if the block contains an radio button or checkbox */ - if (block->gadget && (block->gadget->type == GADGET_RADIO || - block->gadget->type == GADGET_CHECKBOX)) { - /* form checkbox or radio button - * if width or height is AUTO, set it to 1em */ - gadget_unit = CSS_UNIT_EM; - gadget_size = INTTOFIX(1); - if (block->height == AUTO) - block->height = FIXTOINT(nscss_len2px( - &content->len_ctx, gadget_size, - gadget_unit, block->style)); - } - - box = block->children; - /* set current coordinates to top-left of the block */ - cx = 0; - y = cy = block->padding[TOP]; - if (box) - box->y = block->padding[TOP]; - - /* Step through the descendants of the block in depth-first order, but - * not into the children of boxes which aren't blocks. For example, if - * the tree passed to this function looks like this (box->type shown): - * - * block -> BOX_BLOCK - * BOX_BLOCK * (1) - * BOX_INLINE_CONTAINER * (2) - * BOX_INLINE - * BOX_TEXT - * ... - * BOX_BLOCK * (3) - * BOX_TABLE * (4) - * BOX_TABLE_ROW - * BOX_TABLE_CELL - * ... - * BOX_TABLE_CELL - * ... - * BOX_BLOCK * (5) - * BOX_INLINE_CONTAINER * (6) - * BOX_TEXT - * ... - * then the while loop will visit each box marked with *, setting box - * to each in the order shown. */ - while (box) { - enum css_overflow_e overflow_x = CSS_OVERFLOW_VISIBLE; - enum css_overflow_e overflow_y = CSS_OVERFLOW_VISIBLE; - - assert(box->type == BOX_BLOCK || box->type == BOX_TABLE || - box->type == BOX_INLINE_CONTAINER); - - /* Tables are laid out before being positioned, because the - * position depends on the width which is calculated in - * table layout. Blocks and inline containers are positioned - * before being laid out, because width is not dependent on - * content, and the position is required during layout for - * correct handling of floats. - */ - - if (box->style && - (css_computed_position(box->style) == - CSS_POSITION_ABSOLUTE || - css_computed_position(box->style) == - CSS_POSITION_FIXED)) { - box->x = box->parent->padding[LEFT]; - /* absolute positioned; this element will establish - * its own block context when it gets laid out later, - * so no need to look at its children now. */ - goto advance_to_next_box; - } - - /* If we don't know which box the current margin collapses - * through to, find out. Update the pos/neg margin values. */ - if (margin_collapse == NULL) { - margin_collapse = layout_next_margin_block( - &content->len_ctx, box, block, - viewport_height, - &max_pos_margin, &max_neg_margin); - /* We have a margin that has not yet been applied. */ - in_margin = true; - } - - /* Clearance. */ - y = 0; - if (box->style && css_computed_clear(box->style) != - CSS_CLEAR_NONE) - y = layout_clear(block->float_children, - css_computed_clear(box->style)); - - /* Find box's overflow properties */ - if (box->style) { - overflow_x = css_computed_overflow_x(box->style); - overflow_y = css_computed_overflow_y(box->style); - } - - /* Blocks establishing a block formatting context get minimum - * left and right margins to avoid any floats. */ - lm = rm = 0; - - if (box->type == BOX_BLOCK || box->flags & IFRAME) { - if (!box->object && !(box->flags & IFRAME) && - !(box->flags & REPLACE_DIM) && - box->style && - (overflow_x != CSS_OVERFLOW_VISIBLE || - overflow_y != CSS_OVERFLOW_VISIBLE)) { - /* box establishes new block formatting context - * so available width may be diminished due to - * floats. */ - int x0, x1, top; - struct box *left, *right; - top = cy + max_pos_margin - max_neg_margin; - top = (top > y) ? top : y; - x0 = cx; - x1 = cx + box->parent->width - - box->parent->padding[LEFT] - - box->parent->padding[RIGHT]; - find_sides(block->float_children, top, top, - &x0, &x1, &left, &right); - /* calculate min required left & right margins - * needed to avoid floats */ - lm = x0 - cx; - rm = cx + box->parent->width - - box->parent->padding[LEFT] - - box->parent->padding[RIGHT] - - x1; - } - layout_block_find_dimensions(&content->len_ctx, - box->parent->width, - viewport_height, lm, rm, box); - if (box->type == BOX_BLOCK && !(box->flags & IFRAME)) { - layout_block_add_scrollbar(box, RIGHT); - layout_block_add_scrollbar(box, BOTTOM); - } - } else if (box->type == BOX_TABLE) { - if (box->style != NULL) { - enum css_width_e wtype; - css_fixed width = 0; - css_unit unit = CSS_UNIT_PX; - - wtype = css_computed_width(box->style, &width, - &unit); - - if (wtype == CSS_WIDTH_AUTO) { - /* max available width may be - * diminished due to floats. */ - int x0, x1, top; - struct box *left, *right; - top = cy + max_pos_margin - - max_neg_margin; - top = (top > y) ? top : y; - x0 = cx; - x1 = cx + box->parent->width - - box->parent->padding[LEFT] - - box->parent->padding[RIGHT]; - find_sides(block->float_children, - top, top, &x0, &x1, - &left, &right); - /* calculate min required left & right - * margins needed to avoid floats */ - lm = x0 - cx; - rm = cx + box->parent->width - - box->parent->padding[LEFT] - - box->parent->padding[RIGHT] - - x1; - } - } - if (!layout_table(box, box->parent->width - lm - rm, - content)) - return false; - layout_solve_width(box, box->parent->width, box->width, - lm, rm, -1, -1); - } - - /* Position box: horizontal. */ - box->x = box->parent->padding[LEFT] + box->margin[LEFT] + - box->border[LEFT].width; - cx += box->x; - - /* Position box: vertical. */ - if (box->border[TOP].width) { - box->y += box->border[TOP].width; - cy += box->border[TOP].width; - } - - /* Vertical margin */ - if (((box->type == BOX_BLOCK && - (box->flags & HAS_HEIGHT)) || - box->type == BOX_TABLE || - (box->type == BOX_INLINE_CONTAINER && - box != box->parent->children) || - margin_collapse == box) && - in_margin == true) { - /* Margin goes above this box. */ - cy += max_pos_margin - max_neg_margin; - box->y += max_pos_margin - max_neg_margin; - - /* Current margin has been applied. */ - in_margin = false; - max_pos_margin = max_neg_margin = 0; - } - - /* Handle clearance */ - if (box->type != BOX_INLINE_CONTAINER && - (y > 0) && (cy < y)) { - /* box clears something*/ - box->y += y - cy; - cy = y; - } - - /* Unless the box has an overflow style of visible, the box - * establishes a new block context. */ - if (box->type == BOX_BLOCK && box->style && - (overflow_x != CSS_OVERFLOW_VISIBLE || - overflow_y != CSS_OVERFLOW_VISIBLE)) { - - layout_block_context(box, viewport_height, content); - - cy += box->padding[TOP]; - - if (box->height == AUTO) { - box->height = 0; - layout_block_add_scrollbar(box, BOTTOM); - } - - cx -= box->x; - cy += box->height + box->padding[BOTTOM] + - box->border[BOTTOM].width; - y = box->y + box->padding[TOP] + box->height + - box->padding[BOTTOM] + - box->border[BOTTOM].width; - - /* Skip children, because they are done in the new - * block context */ - goto advance_to_next_box; - } - - NSLOG(layout, DEBUG, "box %p, cx %i, cy %i", box, cx, cy); - - /* Layout (except tables). */ - if (box->object) { - if (!layout_block_object(box)) - return false; - - } else if (box->type == BOX_INLINE_CONTAINER) { - box->width = box->parent->width; - if (!layout_inline_container(box, box->width, block, - cx, cy, content)) - return false; - - } else if (box->type == BOX_TABLE) { - /* Move down to avoid floats if necessary. */ - int x0, x1; - struct box *left, *right; - y = cy; - while (1) { - enum css_width_e wtype; - css_fixed width = 0; - css_unit unit = CSS_UNIT_PX; - - wtype = css_computed_width(box->style, - &width, &unit); - - x0 = cx; - x1 = cx + box->parent->width; - find_sides(block->float_children, y, - y + box->height, - &x0, &x1, &left, &right); - if (wtype == CSS_WIDTH_AUTO) - break; - if (box->width <= x1 - x0) - break; - if (!left && !right) - break; - else if (!left) - y = right->y + right->height + 1; - else if (!right) - y = left->y + left->height + 1; - else if (left->y + left->height < - right->y + right->height) - y = left->y + left->height + 1; - else - y = right->y + right->height + 1; - } - box->x += x0 - cx; - cx = x0; - box->y += y - cy; - cy = y; - } - - /* Advance to next box. */ - if (box->type == BOX_BLOCK && !box->object && !(box->iframe) && - box->children) { - /* Down into children. */ - - if (box == margin_collapse) { - /* Current margin collapsed though to this box. - * Unset margin_collapse. */ - margin_collapse = NULL; - } - - y = box->padding[TOP]; - box = box->children; - box->y = y; - cy += y; - continue; - } else if (box->type == BOX_BLOCK || box->object || - box->flags & IFRAME) - cy += box->padding[TOP]; - - if (box->type == BOX_BLOCK && box->height == AUTO) { - box->height = 0; - layout_block_add_scrollbar(box, BOTTOM); - } - - cy += box->height + box->padding[BOTTOM] + - box->border[BOTTOM].width; - cx -= box->x; - y = box->y + box->padding[TOP] + box->height + - box->padding[BOTTOM] + - box->border[BOTTOM].width; - - advance_to_next_box: - if (!box->next) { - /* No more siblings: - * up to first ancestor with a sibling. */ - - do { - if (box == margin_collapse) { - /* Current margin collapsed though to - * this box. Unset margin_collapse. */ - margin_collapse = NULL; - } - - /* Apply bottom margin */ - if (max_pos_margin < box->margin[BOTTOM]) - max_pos_margin = box->margin[BOTTOM]; - else if (max_neg_margin < -box->margin[BOTTOM]) - max_neg_margin = -box->margin[BOTTOM]; - - box = box->parent; - if (box == block) - break; - - /* Margin is invalidated if this is a box - * margins can't collapse through. */ - if (box->type == BOX_BLOCK && - box->flags & MAKE_HEIGHT) { - margin_collapse = NULL; - in_margin = false; - max_pos_margin = max_neg_margin = 0; - } - - if (box->height == AUTO) { - box->height = y - box->padding[TOP]; - - if (box->type == BOX_BLOCK) - layout_block_add_scrollbar(box, - BOTTOM); - } else - cy += box->height - - (y - box->padding[TOP]); - - /* Apply any min-height and max-height to - * boxes in normal flow */ - if (box->style && - css_computed_position(box->style) != - CSS_POSITION_ABSOLUTE && - layout_apply_minmax_height( - &content->len_ctx, - box, NULL)) { - /* Height altered */ - /* Set current cy */ - cy += box->height - - (y - box->padding[TOP]); - } - - cy += box->padding[BOTTOM] + - box->border[BOTTOM].width; - cx -= box->x; - y = box->y + box->padding[TOP] + box->height + - box->padding[BOTTOM] + - box->border[BOTTOM].width; - - } while (box->next == NULL); - if (box == block) - break; - } - - /* To next sibling. */ - - if (box == margin_collapse) { - /* Current margin collapsed though to this box. - * Unset margin_collapse. */ - margin_collapse = NULL; - } - - if (max_pos_margin < box->margin[BOTTOM]) - max_pos_margin = box->margin[BOTTOM]; - else if (max_neg_margin < -box->margin[BOTTOM]) - max_neg_margin = -box->margin[BOTTOM]; - - box = box->next; - box->y = y; - } - - /* Account for bottom margin of last contained block */ - cy += max_pos_margin - max_neg_margin; - - /* Increase height to contain any floats inside (CSS 2.1 10.6.7). */ - for (box = block->float_children; box; box = box->next_float) { - y = box->y + box->height + box->padding[BOTTOM] + - box->border[BOTTOM].width + box->margin[BOTTOM]; - if (cy < y) - cy = y; - } - - if (block->height == AUTO) { - block->height = cy - block->padding[TOP]; - if (block->type == BOX_BLOCK) - layout_block_add_scrollbar(block, BOTTOM); - } - - if (block->style && css_computed_position(block->style) != - CSS_POSITION_ABSOLUTE) { - /* Block is in normal flow */ - layout_apply_minmax_height(&content->len_ctx, block, NULL); - } - - if (block->gadget && - (block->gadget->type == GADGET_TEXTAREA || - block->gadget->type == GADGET_PASSWORD || - block->gadget->type == GADGET_TEXTBOX)) { - plot_font_style_t fstyle; - int ta_width = block->padding[LEFT] + block->width + - block->padding[RIGHT]; - int ta_height = block->padding[TOP] + block->height + - block->padding[BOTTOM]; - font_plot_style_from_css(&content->len_ctx, - block->style, &fstyle); - fstyle.background = NS_TRANSPARENT; - textarea_set_layout(block->gadget->data.text.ta, - &fstyle, ta_width, ta_height, - block->padding[TOP], block->padding[RIGHT], - block->padding[BOTTOM], block->padding[LEFT]); - } - - return true; -} - - -/** - * Layout list markers. - */ -static void -layout_lists(struct box *box, - const struct gui_layout_table *font_func, - const nscss_len_ctx *len_ctx) -{ - struct box *child; - struct box *marker; - plot_font_style_t fstyle; - - for (child = box->children; child; child = child->next) { - if (child->list_marker) { - marker = child->list_marker; - if (marker->object) { - marker->width = - content_get_width(marker->object); - marker->x = -marker->width; - marker->height = - content_get_height(marker->object); - marker->y = (line_height(len_ctx, - marker->style) - - marker->height) / 2; - } else if (marker->text) { - if (marker->width == UNKNOWN_WIDTH) { - font_plot_style_from_css(len_ctx, - marker->style, &fstyle); - font_func->width(&fstyle, - marker->text, - marker->length, - &marker->width); - marker->flags |= MEASURED; - } - marker->x = -marker->width; - marker->y = 0; - marker->height = line_height(len_ctx, - marker->style); - } else { - marker->x = 0; - marker->y = 0; - marker->width = 0; - marker->height = 0; - } - /* Gap between marker and content */ - marker->x -= 4; - } - layout_lists(child, font_func, len_ctx); - } -} - - -/** - * Compute box offsets for a relatively or absolutely positioned box with - * respect to a box. - * - * \param len_ctx Length conversion context - * \param box box to compute offsets for - * \param containing_block box to compute percentages with respect to - * \param top updated to top offset, or AUTO - * \param right updated to right offset, or AUTO - * \param bottom updated to bottom offset, or AUTO - * \param left updated to left offset, or AUTO - * - * See CSS 2.1 9.3.2. containing_block must have width and height. - */ -static void -layout_compute_offsets(const nscss_len_ctx *len_ctx, - struct box *box, - struct box *containing_block, - int *top, - int *right, - int *bottom, - int *left) -{ - uint32_t type; - css_fixed value = 0; - css_unit unit = CSS_UNIT_PX; - - assert(containing_block->width != UNKNOWN_WIDTH && - containing_block->width != AUTO && - containing_block->height != AUTO); - - /* left */ - type = css_computed_left(box->style, &value, &unit); - if (type == CSS_LEFT_SET) { - if (unit == CSS_UNIT_PCT) { - *left = FPCT_OF_INT_TOINT(value, - containing_block->width); - } else { - *left = FIXTOINT(nscss_len2px(len_ctx, - value, unit, box->style)); - } - } else { - *left = AUTO; - } - - /* right */ - type = css_computed_right(box->style, &value, &unit); - if (type == CSS_RIGHT_SET) { - if (unit == CSS_UNIT_PCT) { - *right = FPCT_OF_INT_TOINT(value, - containing_block->width); - } else { - *right = FIXTOINT(nscss_len2px(len_ctx, - value, unit, box->style)); - } - } else { - *right = AUTO; - } - - /* top */ - type = css_computed_top(box->style, &value, &unit); - if (type == CSS_TOP_SET) { - if (unit == CSS_UNIT_PCT) { - *top = FPCT_OF_INT_TOINT(value, - containing_block->height); - } else { - *top = FIXTOINT(nscss_len2px(len_ctx, - value, unit, box->style)); - } - } else { - *top = AUTO; - } - - /* bottom */ - type = css_computed_bottom(box->style, &value, &unit); - if (type == CSS_BOTTOM_SET) { - if (unit == CSS_UNIT_PCT) { - *bottom = FPCT_OF_INT_TOINT(value, - containing_block->height); - } else { - *bottom = FIXTOINT(nscss_len2px(len_ctx, - value, unit, box->style)); - } - } else { - *bottom = AUTO; - } -} - - -/** - * Layout and position an absolutely positioned box. - * - * \param box absolute box to layout and position - * \param containing_block containing block - * \param cx position of box relative to containing_block - * \param cy position of box relative to containing_block - * \param content memory pool for any new boxes - * \return true on success, false on memory exhaustion - */ -static bool -layout_absolute(struct box *box, - struct box *containing_block, - int cx, int cy, - html_content *content) -{ - int static_left, static_top; /* static position */ - int top, right, bottom, left; - int width, height, max_width, min_width; - int *margin = box->margin; - int *padding = box->padding; - struct box_border *border = box->border; - int available_width = containing_block->width; - int space; - - assert(box->type == BOX_BLOCK || box->type == BOX_TABLE || - box->type == BOX_INLINE_BLOCK); - - /* The static position is where the box would be if it was not - * absolutely positioned. The x and y are filled in by - * layout_block_context(). */ - static_left = cx + box->x; - static_top = cy + box->y; - - if (containing_block->type == BOX_BLOCK || - containing_block->type == BOX_INLINE_BLOCK || - containing_block->type == BOX_TABLE_CELL) { - /* Block level container => temporarily increase containing - * block dimensions to include padding (we restore this - * again at the end) */ - containing_block->width += containing_block->padding[LEFT] + - containing_block->padding[RIGHT]; - containing_block->height += containing_block->padding[TOP] + - containing_block->padding[BOTTOM]; - } else { - /** \todo inline containers */ - } - - layout_compute_offsets(&content->len_ctx, box, containing_block, - &top, &right, &bottom, &left); - - /* Pass containing block into layout_find_dimensions via the float - * containing block box member. This is unused for absolutely positioned - * boxes because a box can't be floated and absolutely positioned. */ - box->float_container = containing_block; - layout_find_dimensions(&content->len_ctx, available_width, -1, - box, box->style, &width, &height, - &max_width, &min_width, 0, 0, - margin, padding, border); - box->float_container = NULL; - - /* 10.3.7 */ - NSLOG(layout, DEBUG, - "%i + %i + %i + %i + %i + %i + %i + %i + %i = %i", - left, margin[LEFT], border[LEFT].width, padding[LEFT], width, - padding[RIGHT], border[RIGHT].width, margin[RIGHT], right, - containing_block->width); - - - if (left == AUTO && width == AUTO && right == AUTO) { - if (margin[LEFT] == AUTO) - margin[LEFT] = 0; - if (margin[RIGHT] == AUTO) - margin[RIGHT] = 0; - left = static_left; - - width = min(max(box->min_width, available_width), - box->max_width); - width -= box->margin[LEFT] + box->border[LEFT].width + - box->padding[LEFT] + box->padding[RIGHT] + - box->border[RIGHT].width + box->margin[RIGHT]; - - /* Adjust for {min|max}-width */ - if (max_width >= 0 && width > max_width) width = max_width; - if (width < min_width) width = min_width; - - right = containing_block->width - - left - - margin[LEFT] - border[LEFT].width - padding[LEFT] - - width - - padding[RIGHT] - border[RIGHT].width - margin[RIGHT]; - } else if (left != AUTO && width != AUTO && right != AUTO) { - - /* Adjust for {min|max}-width */ - if (max_width >= 0 && width > max_width) width = max_width; - if (min_width > 0 && width < min_width) width = min_width; - - if (margin[LEFT] == AUTO && margin[RIGHT] == AUTO) { - space = containing_block->width - - left - border[LEFT].width - - padding[LEFT] - width - padding[RIGHT] - - border[RIGHT].width - right; - if (space < 0) { - margin[LEFT] = 0; - margin[RIGHT] = space; - } else { - margin[LEFT] = margin[RIGHT] = space / 2; - } - } else if (margin[LEFT] == AUTO) { - margin[LEFT] = containing_block->width - - left - border[LEFT].width - - padding[LEFT] - width - padding[RIGHT] - - border[RIGHT].width - margin[RIGHT] - - right; - } else if (margin[RIGHT] == AUTO) { - margin[RIGHT] = containing_block->width - - left - margin[LEFT] - - border[LEFT].width - - padding[LEFT] - width - padding[RIGHT] - - border[RIGHT].width - right; - } else { - right = containing_block->width - - left - margin[LEFT] - - border[LEFT].width - - padding[LEFT] - width - padding[RIGHT] - - border[RIGHT].width - margin[RIGHT]; - } - } else { - if (margin[LEFT] == AUTO) - margin[LEFT] = 0; - if (margin[RIGHT] == AUTO) - margin[RIGHT] = 0; - - if (left == AUTO && width == AUTO && right != AUTO) { - available_width -= right; - - width = min(max(box->min_width, available_width), - box->max_width); - width -= box->margin[LEFT] + box->border[LEFT].width + - box->padding[LEFT] + box->padding[RIGHT] + - box->border[RIGHT].width + box->margin[RIGHT]; - - /* Adjust for {min|max}-width */ - if (max_width >= 0 && width > max_width) - width = max_width; - if (width < min_width) - width = min_width; - - left = containing_block->width - - margin[LEFT] - border[LEFT].width - - padding[LEFT] - width - padding[RIGHT] - - border[RIGHT].width - margin[RIGHT] - - right; - } else if (left == AUTO && width != AUTO && right == AUTO) { - - /* Adjust for {min|max}-width */ - if (max_width >= 0 && width > max_width) - width = max_width; - if (min_width > 0 && width < min_width) - width = min_width; - - left = static_left; - right = containing_block->width - - left - margin[LEFT] - - border[LEFT].width - - padding[LEFT] - width - padding[RIGHT] - - border[RIGHT].width - margin[RIGHT]; - } else if (left != AUTO && width == AUTO && right == AUTO) { - available_width -= left; - - width = min(max(box->min_width, available_width), - box->max_width); - width -= box->margin[LEFT] + box->border[LEFT].width + - box->padding[LEFT] + box->padding[RIGHT] + - box->border[RIGHT].width + box->margin[RIGHT]; - - /* Adjust for {min|max}-width */ - if (max_width >= 0 && width > max_width) - width = max_width; - if (width < min_width) - width = min_width; - - right = containing_block->width - - left - margin[LEFT] - - border[LEFT].width - - padding[LEFT] - width - padding[RIGHT] - - border[RIGHT].width - margin[RIGHT]; - } else if (left == AUTO && width != AUTO && right != AUTO) { - - /* Adjust for {min|max}-width */ - if (max_width >= 0 && width > max_width) - width = max_width; - if (width < min_width) - width = min_width; - - left = containing_block->width - - margin[LEFT] - border[LEFT].width - - padding[LEFT] - width - padding[RIGHT] - - border[RIGHT].width - margin[RIGHT] - - right; - } else if (left != AUTO && width == AUTO && right != AUTO) { - width = containing_block->width - - left - margin[LEFT] - - border[LEFT].width - - padding[LEFT] - padding[RIGHT] - - border[RIGHT].width - margin[RIGHT] - - right; - - /* Adjust for {min|max}-width */ - if (max_width >= 0 && width > max_width) - width = max_width; - if (width < min_width) - width = min_width; - - } else if (left != AUTO && width != AUTO && right == AUTO) { - - /* Adjust for {min|max}-width */ - if (max_width >= 0 && width > max_width) - width = max_width; - if (width < min_width) - width = min_width; - - right = containing_block->width - - left - margin[LEFT] - - border[LEFT].width - - padding[LEFT] - width - padding[RIGHT] - - border[RIGHT].width - margin[RIGHT]; - } - } - - NSLOG(layout, DEBUG, - "%i + %i + %i + %i + %i + %i + %i + %i + %i = %i", - left, margin[LEFT], border[LEFT].width, padding[LEFT], width, - padding[RIGHT], border[RIGHT].width, margin[RIGHT], right, - containing_block->width); - - box->x = left + margin[LEFT] + border[LEFT].width - cx; - if (containing_block->type == BOX_BLOCK || - containing_block->type == BOX_INLINE_BLOCK || - containing_block->type == BOX_TABLE_CELL) { - /* Block-level ancestor => reset container's width */ - containing_block->width -= containing_block->padding[LEFT] + - containing_block->padding[RIGHT]; - } else { - /** \todo inline ancestors */ - } - box->width = width; - box->height = height; - - if (box->type == BOX_BLOCK || box->type == BOX_INLINE_BLOCK || - box->object || box->flags & IFRAME) { - if (!layout_block_context(box, -1, content)) - return false; - } else if (box->type == BOX_TABLE) { - /* layout_table also expects the containing block to be - * stored in the float_container field */ - box->float_container = containing_block; - /* \todo layout_table considers margins etc. again */ - if (!layout_table(box, width, content)) - return false; - box->float_container = NULL; - layout_solve_width(box, box->parent->width, box->width, 0, 0, - -1, -1); - } - - /* 10.6.4 */ - NSLOG(layout, DEBUG, - "%i + %i + %i + %i + %i + %i + %i + %i + %i = %i", - top, margin[TOP], border[TOP].width, padding[TOP], height, - padding[BOTTOM], border[BOTTOM].width, margin[BOTTOM], bottom, - containing_block->height); - - if (top == AUTO && height == AUTO && bottom == AUTO) { - top = static_top; - height = box->height; - if (margin[TOP] == AUTO) - margin[TOP] = 0; - if (margin[BOTTOM] == AUTO) - margin[BOTTOM] = 0; - bottom = containing_block->height - - top - margin[TOP] - border[TOP].width - - padding[TOP] - height - padding[BOTTOM] - - border[BOTTOM].width - margin[BOTTOM]; - } else if (top != AUTO && height != AUTO && bottom != AUTO) { - if (margin[TOP] == AUTO && margin[BOTTOM] == AUTO) { - space = containing_block->height - - top - border[TOP].width - padding[TOP] - - height - padding[BOTTOM] - - border[BOTTOM].width - bottom; - margin[TOP] = margin[BOTTOM] = space / 2; - } else if (margin[TOP] == AUTO) { - margin[TOP] = containing_block->height - - top - border[TOP].width - padding[TOP] - - height - padding[BOTTOM] - - border[BOTTOM].width - margin[BOTTOM] - - bottom; - } else if (margin[BOTTOM] == AUTO) { - margin[BOTTOM] = containing_block->height - - top - margin[TOP] - border[TOP].width - - padding[TOP] - height - - padding[BOTTOM] - border[BOTTOM].width - - bottom; - } else { - bottom = containing_block->height - - top - margin[TOP] - border[TOP].width - - padding[TOP] - height - - padding[BOTTOM] - border[BOTTOM].width - - margin[BOTTOM]; - } - } else { - if (margin[TOP] == AUTO) - margin[TOP] = 0; - if (margin[BOTTOM] == AUTO) - margin[BOTTOM] = 0; - if (top == AUTO && height == AUTO && bottom != AUTO) { - height = box->height; - top = containing_block->height - - margin[TOP] - border[TOP].width - - padding[TOP] - height - - padding[BOTTOM] - border[BOTTOM].width - - margin[BOTTOM] - bottom; - } else if (top == AUTO && height != AUTO && bottom == AUTO) { - top = static_top; - bottom = containing_block->height - - top - margin[TOP] - border[TOP].width - - padding[TOP] - height - - padding[BOTTOM] - border[BOTTOM].width - - margin[BOTTOM]; - } else if (top != AUTO && height == AUTO && bottom == AUTO) { - height = box->height; - bottom = containing_block->height - - top - margin[TOP] - border[TOP].width - - padding[TOP] - height - - padding[BOTTOM] - border[BOTTOM].width - - margin[BOTTOM]; - } else if (top == AUTO && height != AUTO && bottom != AUTO) { - top = containing_block->height - - margin[TOP] - border[TOP].width - - padding[TOP] - height - - padding[BOTTOM] - border[BOTTOM].width - - margin[BOTTOM] - bottom; - } else if (top != AUTO && height == AUTO && bottom != AUTO) { - height = containing_block->height - - top - margin[TOP] - border[TOP].width - - padding[TOP] - padding[BOTTOM] - - border[BOTTOM].width - margin[BOTTOM] - - bottom; - } else if (top != AUTO && height != AUTO && bottom == AUTO) { - bottom = containing_block->height - - top - margin[TOP] - border[TOP].width - - padding[TOP] - height - - padding[BOTTOM] - border[BOTTOM].width - - margin[BOTTOM]; - } - } - - NSLOG(layout, DEBUG, - "%i + %i + %i + %i + %i + %i + %i + %i + %i = %i", - top, margin[TOP], border[TOP].width, padding[TOP], height, - padding[BOTTOM], border[BOTTOM].width, margin[BOTTOM], bottom, - containing_block->height); - - box->y = top + margin[TOP] + border[TOP].width - cy; - if (containing_block->type == BOX_BLOCK || - containing_block->type == BOX_INLINE_BLOCK || - containing_block->type == BOX_TABLE_CELL) { - /* Block-level ancestor => reset container's height */ - containing_block->height -= containing_block->padding[TOP] + - containing_block->padding[BOTTOM]; - } else { - /** \todo Inline ancestors */ - } - box->height = height; - layout_apply_minmax_height(&content->len_ctx, box, containing_block); - - return true; -} - - -/** - * Recursively layout and position absolutely positioned boxes. - * - * \param box tree of boxes to layout - * \param containing_block current containing block - * \param cx position of box relative to containing_block - * \param cy position of box relative to containing_block - * \param content memory pool for any new boxes - * \return true on success, false on memory exhaustion - */ -static bool -layout_position_absolute(struct box *box, - struct box *containing_block, - int cx, int cy, - html_content *content) -{ - struct box *c; - - for (c = box->children; c; c = c->next) { - if ((c->type == BOX_BLOCK || c->type == BOX_TABLE || - c->type == BOX_INLINE_BLOCK) && - (css_computed_position(c->style) == - CSS_POSITION_ABSOLUTE || - css_computed_position(c->style) == - CSS_POSITION_FIXED)) { - if (!layout_absolute(c, containing_block, - cx, cy, content)) - return false; - if (!layout_position_absolute(c, c, 0, 0, content)) - return false; - } else if (c->style && css_computed_position(c->style) == - CSS_POSITION_RELATIVE) { - if (!layout_position_absolute(c, c, 0, 0, content)) - return false; - } else { - int px, py; - if (c->style && (css_computed_float(c->style) == - CSS_FLOAT_LEFT || - css_computed_float(c->style) == - CSS_FLOAT_RIGHT)) { - /* Float x/y coords are relative to nearest - * ansestor with float_children, rather than - * relative to parent. Need to get x/y relative - * to parent */ - struct box *p; - px = c->x; - py = c->y; - for (p = box->parent; p && !p->float_children; - p = p->parent) { - px -= p->x; - py -= p->y; - } - } else { - /* Not a float, so box x/y coords are relative - * to parent */ - px = c->x; - py = c->y; - } - if (!layout_position_absolute(c, containing_block, - cx + px, cy + py, content)) - return false; - } - } - - return true; -} - - -/** - * Compute a box's relative offset as per CSS 2.1 9.4.3 - * - * \param len_ctx Length conversion context - * \param box Box to compute relative offsets for. - * \param x Receives relative offset in x. - * \param y Receives relative offset in y. - */ -static void layout_compute_relative_offset( - const nscss_len_ctx *len_ctx, - struct box *box, - int *x, - int *y) -{ - int left, right, top, bottom; - struct box *containing_block; - - assert(box && box->parent && box->style && - css_computed_position(box->style) == - CSS_POSITION_RELATIVE); - - if (box->float_container && - (css_computed_float(box->style) == CSS_FLOAT_LEFT || - css_computed_float(box->style) == CSS_FLOAT_RIGHT)) { - containing_block = box->float_container; - } else { - containing_block = box->parent; - } - - layout_compute_offsets(len_ctx, box, containing_block, - &top, &right, &bottom, &left); - - if (left == AUTO && right == AUTO) - left = right = 0; - else if (left == AUTO) - /* left is auto => computed = -right */ - left = -right; - else if (right == AUTO) - /* right is auto => computed = -left */ - right = -left; - else { - /* over constrained => examine direction property - * of containing block */ - if (containing_block->style && - css_computed_direction( - containing_block->style) == - CSS_DIRECTION_RTL) { - /* right wins */ - left = -right; - } else { - /* assume LTR in all other cases */ - right = -left; - } - } - - assert(left == -right); - - if (top == AUTO && bottom == AUTO) { - top = bottom = 0; - } else if (top == AUTO) { - top = -bottom; - } else { - /* bottom is AUTO, or neither are AUTO */ - bottom = -top; - } - - NSLOG(layout, DEBUG, "left %i, right %i, top %i, bottom %i", left, - right, top, bottom); - - *x = left; - *y = top; -} - - -/** - * Adjust positions of relatively positioned boxes. - * - * \param len_ctx Length conversion context - * \param root box to adjust the position of - * \param fp box which forms the block formatting context for children of - * "root" which are floats - * \param fx x offset due to intervening relatively positioned boxes - * between current box, "root", and the block formatting context - * box, "fp", for float children of "root" - * \param fy y offset due to intervening relatively positioned boxes - * between current box, "root", and the block formatting context - * box, "fp", for float children of "root" - */ -static void -layout_position_relative( - const nscss_len_ctx *len_ctx, - struct box *root, - struct box *fp, - int fx, - int fy) -{ - struct box *box; /* for children of "root" */ - struct box *fn; /* for block formatting context box for children of - * "box" */ - struct box *fc; /* for float children of the block formatting context, - * "fp" */ - int x, y; /* for the offsets resulting from any relative - * positioning on the current block */ - int fnx, fny; /* for affsets which apply to flat children of "box" */ - - /**\todo ensure containing box is large enough after moving boxes */ - - assert(root); - - /* Normal children */ - for (box = root->children; box; box = box->next) { - - if (box->type == BOX_TEXT) - continue; - - /* If relatively positioned, get offsets */ - if (box->style && css_computed_position(box->style) == - CSS_POSITION_RELATIVE) - layout_compute_relative_offset( - len_ctx, box, &x, &y); - else - x = y = 0; - - /* Adjust float coordinates. - * (note float x and y are relative to their block formatting - * context box and not their parent) */ - if (box->style && (css_computed_float(box->style) == - CSS_FLOAT_LEFT || - css_computed_float(box->style) == - CSS_FLOAT_RIGHT) && - (fx != 0 || fy != 0)) { - /* box is a float and there is a float offset to - * apply */ - for (fc = fp->float_children; fc; fc = fc->next_float) { - if (box == fc->children) { - /* Box is floated in the block - * formatting context block, fp. - * Apply float offsets. */ - box->x += fx; - box->y += fy; - fx = fy = 0; - } - } - } - - if (box->float_children) { - fn = box; - fnx = fny = 0; - } else { - fn = fp; - fnx = fx + x; - fny = fy + y; - } - - /* recurse first */ - layout_position_relative(len_ctx, box, fn, fnx, fny); - - /* Ignore things we're not interested in. */ - if (!box->style || (box->style && - css_computed_position(box->style) != - CSS_POSITION_RELATIVE)) - continue; - - box->x += x; - box->y += y; - - /* Handle INLINEs - their "children" are in fact - * the sibling boxes between the INLINE and - * INLINE_END boxes */ - if (box->type == BOX_INLINE && box->inline_end) { - struct box *b; - for (b = box->next; b && b != box->inline_end; - b = b->next) { - b->x += x; - b->y += y; - } - } - } -} - - -/** - * Find a box's bounding box relative to itself, i.e. the box's border edge box - * - * \param len_ctx Length conversion context - * \param box box find bounding box of - * \param desc_x0 updated to left of box's bbox - * \param desc_y0 updated to top of box's bbox - * \param desc_x1 updated to right of box's bbox - * \param desc_y1 updated to bottom of box's bbox - */ -static void -layout_get_box_bbox( - const nscss_len_ctx *len_ctx, - struct box *box, - int *desc_x0, int *desc_y0, - int *desc_x1, int *desc_y1) -{ - *desc_x0 = -box->border[LEFT].width; - *desc_y0 = -box->border[TOP].width; - *desc_x1 = box->padding[LEFT] + box->width + box->padding[RIGHT] + - box->border[RIGHT].width; - *desc_y1 = box->padding[TOP] + box->height + box->padding[BOTTOM] + - box->border[BOTTOM].width; - - /* To stop the top of text getting clipped when css line-height is - * reduced, we increase the top of the descendant bbox. */ - if (box->type == BOX_BLOCK && box->style != NULL && - css_computed_overflow_y(box->style) == - CSS_OVERFLOW_VISIBLE && - box->object == NULL) { - css_fixed font_size = 0; - css_unit font_unit = CSS_UNIT_PT; - int text_height; - - css_computed_font_size(box->style, &font_size, &font_unit); - text_height = nscss_len2px(len_ctx, font_size, font_unit, - box->style); - text_height = FIXTOINT(text_height * 3 / 4); - *desc_y0 = (*desc_y0 < -text_height) ? *desc_y0 : -text_height; - } -} - - -/** - * Apply changes to box descendant_[xy][01] values due to given child. - * - * \param len_ctx Length conversion context - * \param box box to update - * \param child a box, which may affect box's descendant bbox - * \param off_x offset to apply to child->x coord to treat as child of box - * \param off_y offset to apply to child->y coord to treat as child of box - */ -static void -layout_update_descendant_bbox( - const nscss_len_ctx *len_ctx, - struct box *box, - struct box *child, - int off_x, - int off_y) -{ - int child_desc_x0, child_desc_y0, child_desc_x1, child_desc_y1; - - /* get coordinates of child relative to box */ - int child_x = child->x - off_x; - int child_y = child->y - off_y; - - bool html_object = (child->object && - content_get_type(child->object) == CONTENT_HTML); - - enum css_overflow_e overflow_x = CSS_OVERFLOW_VISIBLE; - enum css_overflow_e overflow_y = CSS_OVERFLOW_VISIBLE; - - if (child->style != NULL) { - overflow_x = css_computed_overflow_x(child->style); - overflow_y = css_computed_overflow_y(child->style); - } - - /* Get child's border edge */ - layout_get_box_bbox(len_ctx, child, - &child_desc_x0, &child_desc_y0, - &child_desc_x1, &child_desc_y1); - - if (overflow_x == CSS_OVERFLOW_VISIBLE && - html_object == false) { - /* get child's descendant bbox relative to box */ - child_desc_x0 = child->descendant_x0; - child_desc_x1 = child->descendant_x1; - } - if (overflow_y == CSS_OVERFLOW_VISIBLE && - html_object == false) { - /* get child's descendant bbox relative to box */ - child_desc_y0 = child->descendant_y0; - child_desc_y1 = child->descendant_y1; - } - - child_desc_x0 += child_x; - child_desc_y0 += child_y; - child_desc_x1 += child_x; - child_desc_y1 += child_y; - - /* increase box's descendant bbox to contain descendants */ - if (child_desc_x0 < box->descendant_x0) - box->descendant_x0 = child_desc_x0; - if (child_desc_y0 < box->descendant_y0) - box->descendant_y0 = child_desc_y0; - if (box->descendant_x1 < child_desc_x1) - box->descendant_x1 = child_desc_x1; - if (box->descendant_y1 < child_desc_y1) - box->descendant_y1 = child_desc_y1; -} - - -/** - * Recursively calculate the descendant_[xy][01] values for a laid-out box tree - * and inform iframe browser windows of their size and position. - * - * \param len_ctx Length conversion context - * \param box tree of boxes to update - */ -static void layout_calculate_descendant_bboxes( - const nscss_len_ctx *len_ctx, - struct box *box) -{ - struct box *child; - - assert(box->width != UNKNOWN_WIDTH); - assert(box->height != AUTO); - /* assert((box->width >= 0) && (box->height >= 0)); */ - - /* Initialise box's descendant box to border edge box */ - layout_get_box_bbox(len_ctx, box, - &box->descendant_x0, &box->descendant_y0, - &box->descendant_x1, &box->descendant_y1); - - /* Extend it to contain HTML contents if box is replaced */ - if (box->object && content_get_type(box->object) == CONTENT_HTML) { - if (box->descendant_x1 < content_get_width(box->object)) - box->descendant_x1 = content_get_width(box->object); - if (box->descendant_y1 < content_get_height(box->object)) - box->descendant_y1 = content_get_height(box->object); - } - - if (box->iframe != NULL) { - int x, y; - box_coords(box, &x, &y); - - browser_window_set_position(box->iframe, x, y); - browser_window_set_dimensions(box->iframe, - box->width, box->height); - browser_window_reformat(box->iframe, true, - box->width, box->height); - } - - if (box->type == BOX_INLINE || box->type == BOX_TEXT) - return; - - if (box->type == BOX_INLINE_END) { - box = box->inline_end; - for (child = box->next; child; - child = child->next) { - if (child->type == BOX_FLOAT_LEFT || - child->type == BOX_FLOAT_RIGHT) - continue; - - layout_update_descendant_bbox(len_ctx, box, child, - box->x, box->y); - - if (child == box->inline_end) - break; - } - return; - } - - if (box->flags & REPLACE_DIM) - /* Box's children aren't displayed if the box is replaced */ - return; - - for (child = box->children; child; child = child->next) { - if (child->type == BOX_FLOAT_LEFT || - child->type == BOX_FLOAT_RIGHT) - continue; - - layout_calculate_descendant_bboxes(len_ctx, child); - - if (box->style && css_computed_overflow_x(box->style) == - CSS_OVERFLOW_HIDDEN && - css_computed_overflow_y(box->style) == - CSS_OVERFLOW_HIDDEN) - continue; - - layout_update_descendant_bbox(len_ctx, box, child, 0, 0); - } - - for (child = box->float_children; child; child = child->next_float) { - assert(child->type == BOX_FLOAT_LEFT || - child->type == BOX_FLOAT_RIGHT); - - layout_calculate_descendant_bboxes(len_ctx, child); - - layout_update_descendant_bbox(len_ctx, box, child, 0, 0); - } - - if (box->list_marker) { - child = box->list_marker; - layout_calculate_descendant_bboxes(len_ctx, child); - - layout_update_descendant_bbox(len_ctx, box, child, 0, 0); - } -} - - -/* exported function documented in render/layout.h */ -bool layout_document(html_content *content, int width, int height) -{ - bool ret; - struct box *doc = content->layout; - const struct gui_layout_table *font_func = content->font_func; - - layout_minmax_block(doc, font_func, content); - - layout_block_find_dimensions(&content->len_ctx, - width, height, 0, 0, doc); - doc->x = doc->margin[LEFT] + doc->border[LEFT].width; - doc->y = doc->margin[TOP] + doc->border[TOP].width; - width -= doc->margin[LEFT] + doc->border[LEFT].width + - doc->padding[LEFT] + doc->padding[RIGHT] + - doc->border[RIGHT].width + doc->margin[RIGHT]; - if (width < 0) { - width = 0; - } - doc->width = width; - - ret = layout_block_context(doc, height, content); - - /* make <html> and <body> fill available height */ - if (doc->y + doc->padding[TOP] + doc->height + doc->padding[BOTTOM] + - doc->border[BOTTOM].width + doc->margin[BOTTOM] < - height) { - doc->height = height - (doc->y + doc->padding[TOP] + - doc->padding[BOTTOM] + - doc->border[BOTTOM].width + - doc->margin[BOTTOM]); - if (doc->children) - doc->children->height = doc->height - - (doc->children->margin[TOP] + - doc->children->border[TOP].width + - doc->children->padding[TOP] + - doc->children->padding[BOTTOM] + - doc->children->border[BOTTOM].width + - doc->children->margin[BOTTOM]); - } - - layout_lists(doc, font_func, &content->len_ctx); - layout_position_absolute(doc, doc, 0, 0, content); - layout_position_relative(&content->len_ctx, doc, doc, 0, 0); - - layout_calculate_descendant_bboxes(&content->len_ctx, doc); - - return ret; -} |