move html and text content handlers where they belong

1 files changed, 1951 insertions, 0 deletions

diff --git a/content/handlers/html/html_redraw.c b/content/handlers/html/html_redraw.c
new file mode 100644
index 000000000..d05df8753
--- /dev/null
+++ b/content/handlers/html/html_redraw.c
@@ -0,0 +1,1951 @@
+/*
+ * Copyright 2004-2008 James Bursa <bursa@users.sourceforge.net>
+ * Copyright 2004-2007 John M Bell <jmb202@ecs.soton.ac.uk>
+ * Copyright 2004-2007 Richard Wilson <info@tinct.net>
+ * Copyright 2005-2006 Adrian Lees <adrianl@users.sourceforge.net>
+ * Copyright 2006 Rob Kendrick <rjek@netsurf-browser.org>
+ * Copyright 2008 Michael Drake <tlsa@netsurf-browser.org>
+ * Copyright 2009 Paul Blokus <paul_pl@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
+ *
+ * Redrawing CONTENT_HTML implementation.
+ */
+
+#include "utils/config.h"
+#include <assert.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <string.h>
+#include <math.h>
+#include <dom/dom.h>
+
+#include "utils/log.h"
+#include "utils/messages.h"
+#include "utils/utils.h"
+#include "utils/nsoption.h"
+#include "netsurf/content.h"
+#include "netsurf/browser_window.h"
+#include "netsurf/plotters.h"
+#include "netsurf/bitmap.h"
+#include "netsurf/layout.h"
+#include "content/content_protected.h"
+#include "css/utils.h"
+#include "desktop/selection.h"
+#include "desktop/print.h"
+#include "desktop/scrollbar.h"
+#include "desktop/textarea.h"
+#include "desktop/gui_internal.h"
+
+#include "html/box.h"
+#include "html/font.h"
+#include "html/form_internal.h"
+#include "html/html_internal.h"
+#include "html/layout.h"
+#include "html/search.h"
+
+
+bool html_redraw_debug = false;
+
+/**
+ * Determine if a box has a background that needs drawing
+ *
+ * \param box  Box to consider
+ * \return True if box has a background, false otherwise.
+ */
+static bool html_redraw_box_has_background(struct box *box)
+{
+	if (box->background != NULL)
+		return true;
+
+	if (box->style != NULL) {
+		css_color colour;
+
+		css_computed_background_color(box->style, &colour);
+
+		if (nscss_color_is_transparent(colour) == false)
+			return true;
+	}
+
+	return false;
+}
+
+/**
+ * Find the background box for a box
+ *
+ * \param box  Box to find background box for
+ * \return Pointer to background box, or NULL if there is none
+ */
+static struct box *html_redraw_find_bg_box(struct box *box)
+{
+	/* Thanks to backwards compatibility, CSS defines the following:
+	 *
+	 * + If the box is for the root element and it has a background,
+	 *   use that (and then process the body box with no special case)
+	 * + If the box is for the root element and it has no background,
+	 *   then use the background (if any) from the body element as if
+	 *   it were specified on the root. Then, when the box for the body
+	 *   element is processed, ignore the background.
+	 * + For any other box, just use its own styling.
+	 */
+	if (box->parent == NULL) {
+		/* Root box */
+		if (html_redraw_box_has_background(box))
+			return box;
+
+		/* No background on root box: consider body box, if any */
+		if (box->children != NULL) {
+			if (html_redraw_box_has_background(box->children))
+				return box->children;
+		}
+	} else if (box->parent != NULL && box->parent->parent == NULL) {
+		/* Body box: only render background if root has its own */
+		if (html_redraw_box_has_background(box) &&
+				html_redraw_box_has_background(box->parent))
+			return box;
+	} else {
+		/* Any other box */
+		if (html_redraw_box_has_background(box))
+			return box;
+	}
+
+	return NULL;
+}
+
+/**
+ * Redraw a short text string, complete with highlighting
+ * (for selection/search)
+ *
+ * \param utf8_text pointer to UTF-8 text string
+ * \param utf8_len  length of string, in bytes
+ * \param offset    byte offset within textual representation
+ * \param space     width of space that follows string (0 = no space)
+ * \param fstyle    text style to use (pass text size unscaled)
+ * \param x         x ordinate at which to plot text
+ * \param y         y ordinate at which to plot text
+ * \param clip      pointer to current clip rectangle
+ * \param height    height of text string
+ * \param scale     current display scale (1.0 = 100%)
+ * \param excluded  exclude this text string from the selection
+ * \param c         Content being redrawn.
+ * \param sel       Selection context
+ * \param search    Search context
+ * \param ctx	    current redraw context
+ * \return true iff successful and redraw should proceed
+ */
+
+static bool
+text_redraw(const char *utf8_text,
+	    size_t utf8_len,
+	    size_t offset,
+	    int space,
+	    const plot_font_style_t *fstyle,
+	    int x,
+	    int y,
+	    const struct rect *clip,
+	    int height,
+	    float scale,
+	    bool excluded,
+	    struct content *c,
+	    const struct selection *sel,
+	    struct search_context *search,
+	    const struct redraw_context *ctx)
+{
+	bool highlighted = false;
+	plot_font_style_t plot_fstyle = *fstyle;
+	nserror res;
+
+	/* Need scaled text size to pass to plotters */
+	plot_fstyle.size *= scale;
+
+	/* is this box part of a selection? */
+	if (!excluded && ctx->interactive == true) {
+		unsigned len = utf8_len + (space ? 1 : 0);
+		unsigned start_idx;
+		unsigned end_idx;
+
+		/* first try the browser window's current selection */
+		if (selection_defined(sel) && selection_highlighted(sel,
+					offset, offset + len,
+					&start_idx, &end_idx)) {
+			highlighted = true;
+		}
+
+		/* what about the current search operation, if any? */
+		if (!highlighted && (search != NULL) &&
+				search_term_highlighted(c,
+						offset, offset + len,
+						&start_idx, &end_idx,
+						search)) {
+			highlighted = true;
+		}
+
+		/* \todo make search terms visible within selected text */
+		if (highlighted) {
+			struct rect r;
+			unsigned endtxt_idx = end_idx;
+			bool clip_changed = false;
+			bool text_visible = true;
+			int startx, endx;
+			plot_style_t pstyle_fill_hback = *plot_style_fill_white;
+			plot_font_style_t fstyle_hback = plot_fstyle;
+
+			if (end_idx > utf8_len) {
+				/* adjust for trailing space, not present in
+				 * utf8_text */
+				assert(end_idx == utf8_len + 1);
+				endtxt_idx = utf8_len;
+			}
+
+			res = guit->layout->width(fstyle,
+						  utf8_text, start_idx,
+						  &startx);
+			if (res != NSERROR_OK) {
+				startx = 0;
+			}
+
+			res = guit->layout->width(fstyle,
+						  utf8_text, endtxt_idx,
+						  &endx);
+			if (res != NSERROR_OK) {
+				endx = 0;
+			}
+
+			/* is there a trailing space that should be highlighted
+			 * as well? */
+			if (end_idx > utf8_len) {
+					endx += space;
+			}
+
+			if (scale != 1.0) {
+				startx *= scale;
+				endx *= scale;
+			}
+
+			/* draw any text preceding highlighted portion */
+			if ((start_idx > 0) &&
+			    (ctx->plot->text(ctx,
+					     &plot_fstyle,
+					     x,
+					     y + (int)(height * 0.75 * scale),
+					     utf8_text,
+					     start_idx) != NSERROR_OK))
+				return false;
+
+			pstyle_fill_hback.fill_colour = fstyle->foreground;
+
+			/* highlighted portion */
+			r.x0 = x + startx;
+			r.y0 = y;
+			r.x1 = x + endx;
+			r.y1 = y + height * scale;
+			res = ctx->plot->rectangle(ctx, &pstyle_fill_hback, &r);
+			if (res != NSERROR_OK) {
+				return false;
+			}
+
+			if (start_idx > 0) {
+				int px0 = max(x + startx, clip->x0);
+				int px1 = min(x + endx, clip->x1);
+
+				if (px0 < px1) {
+					r.x0 = px0;
+					r.y0 = clip->y0;
+					r.x1 = px1;
+					r.y1 = clip->y1;
+					res = ctx->plot->clip(ctx, &r);
+					if (res != NSERROR_OK) {
+						return false;
+					}
+
+					clip_changed = true;
+				} else {
+					text_visible = false;
+				}
+			}
+
+			fstyle_hback.background =
+				pstyle_fill_hback.fill_colour;
+			fstyle_hback.foreground = colour_to_bw_furthest(
+				pstyle_fill_hback.fill_colour);
+
+			if (text_visible &&
+			    (ctx->plot->text(ctx,
+					     &fstyle_hback,
+					     x,
+					     y + (int)(height * 0.75 * scale),
+					     utf8_text,
+					     endtxt_idx) != NSERROR_OK)) {
+				return false;
+			}
+
+			/* draw any text succeeding highlighted portion */
+			if (endtxt_idx < utf8_len) {
+				int px0 = max(x + endx, clip->x0);
+				if (px0 < clip->x1) {
+
+					r.x0 = px0;
+					r.y0 = clip->y0;
+					r.x1 = clip->x1;
+					r.y1 = clip->y1;
+					res = ctx->plot->clip(ctx, &r);
+					if (res != NSERROR_OK) {
+						return false;
+					}
+
+					clip_changed = true;
+
+					res = ctx->plot->text(ctx,
+							      &plot_fstyle,
+							      x,
+							      y + (int)(height * 0.75 * scale),
+							      utf8_text,
+							      utf8_len);
+					if (res != NSERROR_OK) {
+						return false;
+					}
+				}
+			}
+
+			if (clip_changed &&
+			    (ctx->plot->clip(ctx, clip) != NSERROR_OK)) {
+				return false;
+			}
+		}
+	}
+
+	if (!highlighted) {
+		res = ctx->plot->text(ctx,
+				      &plot_fstyle,
+				      x,
+				      y + (int) (height * 0.75 * scale),
+				      utf8_text,
+				      utf8_len);
+		if (res != NSERROR_OK) {
+			return false;
+		}
+	}
+	return true;
+}
+
+
+/**
+ * Plot a checkbox.
+ *
+ * \param  x	     left coordinate
+ * \param  y	     top coordinate
+ * \param  width     dimensions of checkbox
+ * \param  height    dimensions of checkbox
+ * \param  selected  the checkbox is selected
+ * \param  ctx	     current redraw context
+ * \return true if successful, false otherwise
+ */
+
+static bool html_redraw_checkbox(int x, int y, int width, int height,
+		bool selected, const struct redraw_context *ctx)
+{
+	double z;
+	nserror res;
+	struct rect rect;
+
+	z = width * 0.15;
+	if (z == 0) {
+		z = 1;
+	}
+
+	rect.x0 = x;
+	rect.y0 = y ;
+	rect.x1 = x + width;
+	rect.y1 = y + height;
+	res = ctx->plot->rectangle(ctx, plot_style_fill_wbasec, &rect);
+	if (res != NSERROR_OK) {
+		return false;
+	}
+
+	/* dark line across top */
+	rect.y1 = y;
+	res = ctx->plot->line(ctx, plot_style_stroke_darkwbasec, &rect);
+	if (res != NSERROR_OK) {
+		return false;
+	}
+
+	/* dark line across left */
+	rect.x1 = x;
+	rect.y1 = y + height;
+	res = ctx->plot->line(ctx, plot_style_stroke_darkwbasec, &rect);
+	if (res != NSERROR_OK) {
+		return false;
+	}
+
+	/* light line across right */
+	rect.x0 = x + width;
+	rect.x1 = x + width;
+	res = ctx->plot->line(ctx, plot_style_stroke_lightwbasec, &rect);
+	if (res != NSERROR_OK) {
+		return false;
+	}
+
+	/* light line across bottom */
+	rect.x0 = x;
+	rect.y0 = y + height;
+	res = ctx->plot->line(ctx, plot_style_stroke_lightwbasec, &rect);
+	if (res != NSERROR_OK) {
+		return false;
+	}
+
+	if (selected) {
+		if (width < 12 || height < 12) {
+			/* render a solid box instead of a tick */
+			rect.x0 = x + z + z;
+			rect.y0 = y + z + z;
+			rect.x1 = x + width - z;
+			rect.y1 = y + height - z;
+			res = ctx->plot->rectangle(ctx, plot_style_fill_wblobc, &rect);
+			if (res != NSERROR_OK) {
+				return false;
+			}
+		} else {
+			/* render a tick, as it'll fit comfortably */
+			rect.x0 = x + width - z;
+			rect.y0 = y + z;
+			rect.x1 = x + (z * 3);
+			rect.y1 = y + height - z;
+			res = ctx->plot->line(ctx, plot_style_stroke_wblobc, &rect);
+			if (res != NSERROR_OK) {
+				return false;
+			}
+
+			rect.x0 = x + (z * 3);
+			rect.y0 = y + height - z;
+			rect.x1 = x + z + z;
+			rect.y1 = y + (height / 2);
+			res = ctx->plot->line(ctx, plot_style_stroke_wblobc, &rect);
+			if (res != NSERROR_OK) {
+				return false;
+			}
+		}
+	}
+	return true;
+}
+
+
+/**
+ * Plot a radio icon.
+ *
+ * \param  x	     left coordinate
+ * \param  y	     top coordinate
+ * \param  width     dimensions of radio icon
+ * \param  height    dimensions of radio icon
+ * \param  selected  the radio icon is selected
+ * \param  ctx	     current redraw context
+ * \return true if successful, false otherwise
+ */
+static bool html_redraw_radio(int x, int y, int width, int height,
+		bool selected, const struct redraw_context *ctx)
+{
+	nserror res;
+
+	/* plot background of radio button */
+	res = ctx->plot->disc(ctx,
+			      plot_style_fill_wbasec,
+			      x + width * 0.5,
+			      y + height * 0.5,
+			      width * 0.5 - 1);
+	if (res != NSERROR_OK) {
+		return false;
+	}
+
+	/* plot dark arc */
+	res = ctx->plot->arc(ctx,
+			     plot_style_fill_darkwbasec,
+			     x + width * 0.5,
+			     y + height * 0.5,
+			     width * 0.5 - 1,
+			     45,
+			     225);
+	if (res != NSERROR_OK) {
+		return false;
+	}
+
+	/* plot light arc */
+	res = ctx->plot->arc(ctx,
+			     plot_style_fill_lightwbasec,
+			     x + width * 0.5,
+			     y + height * 0.5,
+			     width * 0.5 - 1,
+			     225,
+			     45);
+	if (res != NSERROR_OK) {
+		return false;
+	}
+
+	if (selected) {
+		/* plot selection blob */
+		res = ctx->plot->disc(ctx,
+				      plot_style_fill_wblobc,
+				      x + width * 0.5,
+				      y + height * 0.5,
+				      width * 0.3 - 1);
+		if (res != NSERROR_OK) {
+			return false;
+		}
+	}
+
+	return true;
+}
+
+
+/**
+ * Plot a file upload input.
+ *
+ * \param  x	     left coordinate
+ * \param  y	     top coordinate
+ * \param  width     dimensions of input
+ * \param  height    dimensions of input
+ * \param  box	     box of input
+ * \param  scale     scale for redraw
+ * \param  background_colour  current background colour
+ * \param  len_ctx   Length conversion context
+ * \param  ctx	     current redraw context
+ * \return true if successful, false otherwise
+ */
+
+static bool html_redraw_file(int x, int y, int width, int height,
+		struct box *box, float scale, colour background_colour,
+		const nscss_len_ctx *len_ctx,
+		const struct redraw_context *ctx)
+{
+	int text_width;
+	const char *text;
+	size_t length;
+	plot_font_style_t fstyle;
+	nserror res;
+
+	font_plot_style_from_css(len_ctx, box->style, &fstyle);
+	fstyle.background = background_colour;
+
+	if (box->gadget->value) {
+		text = box->gadget->value;
+	} else {
+		text = messages_get("Form_Drop");
+	}
+	length = strlen(text);
+
+	res = guit->layout->width(&fstyle, text, length, &text_width);
+	if (res != NSERROR_OK) {
+		return false;
+	}
+	text_width *= scale;
+	if (width < text_width + 8) {
+		x = x + width - text_width - 4;
+	} else {
+		x = x + 4;
+	}
+
+	res = ctx->plot->text(ctx, &fstyle, x, y + height * 0.75, text, length);
+	if (res != NSERROR_OK) {
+		return false;
+	}
+	return true;
+}
+
+
+/**
+ * Plot background images.
+ *
+ * The reason for the presence of \a background is the backwards compatibility
+ * mess that is backgrounds on &lt;body&gt;. The background will be drawn relative
+ * to \a box, using the background information contained within \a background.
+ *
+ * \param  x	  coordinate of box
+ * \param  y	  coordinate of box
+ * \param  box	  box to draw background image of
+ * \param  scale  scale for redraw
+ * \param  clip   current clip rectangle
+ * \param  background_colour  current background colour
+ * \param  background  box containing background details (usually \a box)
+ * \param  len_ctx  Length conversion context
+ * \param  ctx      current redraw context
+ * \return true if successful, false otherwise
+ */
+
+static bool html_redraw_background(int x, int y, struct box *box, float scale,
+		const struct rect *clip, colour *background_colour,
+		struct box *background,
+		const nscss_len_ctx *len_ctx,
+		const struct redraw_context *ctx)
+{
+	bool repeat_x = false;
+	bool repeat_y = false;
+	bool plot_colour = true;
+	bool plot_content;
+	bool clip_to_children = false;
+	struct box *clip_box = box;
+	int ox = x, oy = y;
+	int width, height;
+	css_fixed hpos = 0, vpos = 0;
+	css_unit hunit = CSS_UNIT_PX, vunit = CSS_UNIT_PX;
+	struct box *parent;
+	struct rect r = *clip;
+	css_color bgcol;
+	plot_style_t pstyle_fill_bg = {
+		.fill_type = PLOT_OP_TYPE_SOLID,
+		.fill_colour = *background_colour,
+	};
+	nserror res;
+
+	if (ctx->background_images == false)
+		return true;
+
+	plot_content = (background->background != NULL);
+
+	if (plot_content) {
+		if (!box->parent) {
+			/* Root element, special case:
+			 * background origin calc. is based on margin box */
+			x -= box->margin[LEFT] * scale;
+			y -= box->margin[TOP] * scale;
+			width = box->margin[LEFT] + box->padding[LEFT] +
+					box->width + box->padding[RIGHT] +
+					box->margin[RIGHT];
+			height = box->margin[TOP] + box->padding[TOP] +
+					box->height + box->padding[BOTTOM] +
+					box->margin[BOTTOM];
+		} else {
+			width = box->padding[LEFT] + box->width +
+					box->padding[RIGHT];
+			height = box->padding[TOP] + box->height +
+					box->padding[BOTTOM];
+		}
+		/* handle background-repeat */
+		switch (css_computed_background_repeat(background->style)) {
+		case CSS_BACKGROUND_REPEAT_REPEAT:
+			repeat_x = repeat_y = true;
+			/* optimisation: only plot the colour if
+			 * bitmap is not opaque */
+			plot_colour = !content_get_opaque(background->background);
+			break;
+
+		case CSS_BACKGROUND_REPEAT_REPEAT_X:
+			repeat_x = true;
+			break;
+
+		case CSS_BACKGROUND_REPEAT_REPEAT_Y:
+			repeat_y = true;
+			break;
+
+		case CSS_BACKGROUND_REPEAT_NO_REPEAT:
+			break;
+
+		default:
+			break;
+		}
+
+		/* handle background-position */
+		css_computed_background_position(background->style,
+				&hpos, &hunit, &vpos, &vunit);
+		if (hunit == CSS_UNIT_PCT) {
+			x += (width -
+				content_get_width(background->background)) *
+				scale * FIXTOFLT(hpos) / 100.;
+		} else {
+			x += (int) (FIXTOFLT(nscss_len2px(len_ctx, hpos, hunit,
+					background->style)) * scale);
+		}
+
+		if (vunit == CSS_UNIT_PCT) {
+			y += (height -
+				content_get_height(background->background)) *
+				scale * FIXTOFLT(vpos) / 100.;
+		} else {
+			y += (int) (FIXTOFLT(nscss_len2px(len_ctx, vpos, vunit,
+					background->style)) * scale);
+		}
+	}
+
+	/* special case for table rows as their background needs
+	 * to be clipped to all the cells */
+	if (box->type == BOX_TABLE_ROW) {
+		css_fixed h = 0, v = 0;
+		css_unit hu = CSS_UNIT_PX, vu = CSS_UNIT_PX;
+
+		for (parent = box->parent;
+			((parent) && (parent->type != BOX_TABLE));
+				parent = parent->parent);
+		assert(parent && (parent->style));
+
+		css_computed_border_spacing(parent->style, &h, &hu, &v, &vu);
+
+		clip_to_children = (h > 0) || (v > 0);
+
+		if (clip_to_children)
+			clip_box = box->children;
+	}
+
+	for (; clip_box; clip_box = clip_box->next) {
+		/* clip to child boxes if needed */
+		if (clip_to_children) {
+			assert(clip_box->type == BOX_TABLE_CELL);
+
+			/* update clip.* to the child cell */
+			r.x0 = ox + (clip_box->x * scale);
+			r.y0 = oy + (clip_box->y * scale);
+			r.x1 = r.x0 + (clip_box->padding[LEFT] +
+					clip_box->width +
+					clip_box->padding[RIGHT]) * scale;
+			r.y1 = r.y0 + (clip_box->padding[TOP] +
+					clip_box->height +
+					clip_box->padding[BOTTOM]) * scale;
+
+			if (r.x0 < clip->x0) r.x0 = clip->x0;
+			if (r.y0 < clip->y0) r.y0 = clip->y0;
+			if (r.x1 > clip->x1) r.x1 = clip->x1;
+			if (r.y1 > clip->y1) r.y1 = clip->y1;
+
+			css_computed_background_color(clip_box->style, &bgcol);
+
+			/* <td> attributes override <tr> */
+			/* if the background content is opaque there
+			 * is no need to plot underneath it.
+			 */
+			if ((r.x0 >= r.x1) ||
+			    (r.y0 >= r.y1) ||
+			    (nscss_color_is_transparent(bgcol) == false) ||
+			    ((clip_box->background != NULL) &&
+			     content_get_opaque(clip_box->background)))
+				continue;
+		}
+
+		/* plot the background colour */
+		css_computed_background_color(background->style, &bgcol);
+
+		if (nscss_color_is_transparent(bgcol) == false) {
+			*background_colour = nscss_color_to_ns(bgcol);
+			pstyle_fill_bg.fill_colour = *background_colour;
+			if (plot_colour) {
+				res = ctx->plot->rectangle(ctx, &pstyle_fill_bg, &r);
+				if (res != NSERROR_OK) {
+					return false;
+				}
+			}
+		}
+		/* and plot the image */
+		if (plot_content) {
+			width = content_get_width(background->background);
+			height = content_get_height(background->background);
+
+			/* ensure clip area only as large as required */
+			if (!repeat_x) {
+				if (r.x0 < x)
+					r.x0 = x;
+				if (r.x1 > x + width * scale)
+					r.x1 = x + width * scale;
+			}
+			if (!repeat_y) {
+				if (r.y0 < y)
+					r.y0 = y;
+				if (r.y1 > y + height * scale)
+					r.y1 = y + height * scale;
+			}
+			/* valid clipping rectangles only */
+			if ((r.x0 < r.x1) && (r.y0 < r.y1)) {
+				struct content_redraw_data bg_data;
+
+				res = ctx->plot->clip(ctx, &r);
+				if (res != NSERROR_OK) {
+					return false;
+				}
+
+				bg_data.x = x;
+				bg_data.y = y;
+				bg_data.width = ceilf(width * scale);
+				bg_data.height = ceilf(height * scale);
+				bg_data.background_colour = *background_colour;
+				bg_data.scale = scale;
+				bg_data.repeat_x = repeat_x;
+				bg_data.repeat_y = repeat_y;
+
+				/* We just continue if redraw fails */
+				content_redraw(background->background,
+						&bg_data, &r, ctx);
+			}
+		}
+
+		/* only <tr> rows being clipped to child boxes loop */
+		if (!clip_to_children)
+			return true;
+	}
+	return true;
+}
+
+
+/**
+ * Plot an inline's background and/or background image.
+ *
+ * \param  x	  coordinate of box
+ * \param  y	  coordinate of box
+ * \param  box	  BOX_INLINE which created the background
+ * \param  scale  scale for redraw
+ * \param  clip	  coordinates of clip rectangle
+ * \param  b	  coordinates of border edge rectangle
+ * \param  first  true if this is the first rectangle associated with the inline
+ * \param  last   true if this is the last rectangle associated with the inline
+ * \param  background_colour  updated to current background colour if plotted
+ * \param  len_ctx  Length conversion context
+ * \param  ctx      current redraw context
+ * \return true if successful, false otherwise
+ */
+
+static bool html_redraw_inline_background(int x, int y, struct box *box,
+		float scale, const struct rect *clip, struct rect b,
+		bool first, bool last, colour *background_colour,
+		const nscss_len_ctx *len_ctx,
+		const struct redraw_context *ctx)
+{
+	struct rect r = *clip;
+	bool repeat_x = false;
+	bool repeat_y = false;
+	bool plot_colour = true;
+	bool plot_content;
+	css_fixed hpos = 0, vpos = 0;
+	css_unit hunit = CSS_UNIT_PX, vunit = CSS_UNIT_PX;
+	css_color bgcol;
+	plot_style_t pstyle_fill_bg = {
+		.fill_type = PLOT_OP_TYPE_SOLID,
+		.fill_colour = *background_colour,
+	};
+	nserror res;
+
+	plot_content = (box->background != NULL);
+
+	if (html_redraw_printing && nsoption_bool(remove_backgrounds))
+		return true;
+
+	if (plot_content) {
+		/* handle background-repeat */
+		switch (css_computed_background_repeat(box->style)) {
+		case CSS_BACKGROUND_REPEAT_REPEAT:
+			repeat_x = repeat_y = true;
+			/* optimisation: only plot the colour if
+			 * bitmap is not opaque
+			 */
+			plot_colour = !content_get_opaque(box->background);
+			break;
+
+		case CSS_BACKGROUND_REPEAT_REPEAT_X:
+			repeat_x = true;
+			break;
+
+		case CSS_BACKGROUND_REPEAT_REPEAT_Y:
+			repeat_y = true;
+			break;
+
+		case CSS_BACKGROUND_REPEAT_NO_REPEAT:
+			break;
+
+		default:
+			break;
+		}
+
+		/* handle background-position */
+		css_computed_background_position(box->style,
+				&hpos, &hunit, &vpos, &vunit);
+		if (hunit == CSS_UNIT_PCT) {
+			x += (b.x1 - b.x0 -
+					content_get_width(box->background) *
+					scale) * FIXTOFLT(hpos) / 100.;
+
+			if (!repeat_x && ((hpos < 2 && !first) ||
+					(hpos > 98 && !last))){
+				plot_content = false;
+			}
+		} else {
+			x += (int) (FIXTOFLT(nscss_len2px(len_ctx, hpos, hunit,
+					box->style)) * scale);
+		}
+
+		if (vunit == CSS_UNIT_PCT) {
+			y += (b.y1 - b.y0 -
+					content_get_height(box->background) *
+					scale) * FIXTOFLT(vpos) / 100.;
+		} else {
+			y += (int) (FIXTOFLT(nscss_len2px(len_ctx, vpos, vunit,
+					box->style)) * scale);
+		}
+	}
+
+	/* plot the background colour */
+	css_computed_background_color(box->style, &bgcol);
+
+	if (nscss_color_is_transparent(bgcol) == false) {
+		*background_colour = nscss_color_to_ns(bgcol);
+		pstyle_fill_bg.fill_colour = *background_colour;
+
+		if (plot_colour) {
+			res = ctx->plot->rectangle(ctx, &pstyle_fill_bg, &r);
+			if (res != NSERROR_OK) {
+				return false;
+			}
+		}
+	}
+	/* and plot the image */
+	if (plot_content) {
+		int width = content_get_width(box->background);
+		int height = content_get_height(box->background);
+
+		if (!repeat_x) {
+			if (r.x0 < x)
+				r.x0 = x;
+			if (r.x1 > x + width * scale)
+				r.x1 = x + width * scale;
+		}
+		if (!repeat_y) {
+			if (r.y0 < y)
+				r.y0 = y;
+			if (r.y1 > y + height * scale)
+				r.y1 = y + height * scale;
+		}
+		/* valid clipping rectangles only */
+		if ((r.x0 < r.x1) && (r.y0 < r.y1)) {
+			struct content_redraw_data bg_data;
+
+			res = ctx->plot->clip(ctx, &r);
+			if (res != NSERROR_OK) {
+				return false;
+			}
+
+			bg_data.x = x;
+			bg_data.y = y;
+			bg_data.width = ceilf(width * scale);
+			bg_data.height = ceilf(height * scale);
+			bg_data.background_colour = *background_colour;
+			bg_data.scale = scale;
+			bg_data.repeat_x = repeat_x;
+			bg_data.repeat_y = repeat_y;
+
+			/* We just continue if redraw fails */
+			content_redraw(box->background, &bg_data, &r, ctx);
+		}
+	}
+
+	return true;
+}
+
+
+/**
+ * Plot text decoration for an inline box.
+ *
+ * \param  box     box to plot decorations for, of type BOX_INLINE
+ * \param  x       x coordinate of parent of box
+ * \param  y       y coordinate of parent of box
+ * \param  scale   scale for redraw
+ * \param  colour  colour for decorations
+ * \param  ratio   position of line as a ratio of line height
+ * \param  ctx	   current redraw context
+ * \return true if successful, false otherwise
+ */
+
+static bool
+html_redraw_text_decoration_inline(struct box *box,
+				   int x, int y,
+				   float scale,
+				   colour colour,
+				   float ratio,
+				   const struct redraw_context *ctx)
+{
+	struct box *c;
+	plot_style_t plot_style_box = {
+		.stroke_type = PLOT_OP_TYPE_SOLID,
+		.stroke_colour = colour,
+	};
+	nserror res;
+	struct rect rect;
+
+	for (c = box->next;
+	     c && c != box->inline_end;
+	     c = c->next) {
+		if (c->type != BOX_TEXT) {
+			continue;
+		}
+		rect.x0 = (x + c->x) * scale;
+		rect.y0 = (y + c->y + c->height * ratio) * scale;
+		rect.x1 = (x + c->x + c->width) * scale;
+		rect.y1 = (y + c->y + c->height * ratio) * scale;
+		res = ctx->plot->line(ctx, &plot_style_box, &rect);
+		if (res != NSERROR_OK) {
+			return false;
+		}
+	}
+	return true;
+}
+
+
+/**
+ * Plot text decoration for an non-inline box.
+ *
+ * \param  box     box to plot decorations for, of type other than BOX_INLINE
+ * \param  x       x coordinate of box
+ * \param  y       y coordinate of box
+ * \param  scale   scale for redraw
+ * \param  colour  colour for decorations
+ * \param  ratio   position of line as a ratio of line height
+ * \param  ctx	   current redraw context
+ * \return true if successful, false otherwise
+ */
+
+static bool
+html_redraw_text_decoration_block(struct box *box,
+				  int x, int y,
+				  float scale,
+				  colour colour,
+				  float ratio,
+				  const struct redraw_context *ctx)
+{
+	struct box *c;
+	plot_style_t plot_style_box = {
+		.stroke_type = PLOT_OP_TYPE_SOLID,
+		.stroke_colour = colour,
+	};
+	nserror res;
+	struct rect rect;
+
+	/* draw through text descendants */
+	for (c = box->children; c; c = c->next) {
+		if (c->type == BOX_TEXT) {
+			rect.x0 = (x + c->x) * scale;
+			rect.y0 = (y + c->y + c->height * ratio) * scale;
+			rect.x1 = (x + c->x + c->width) * scale;
+			rect.y1 = (y + c->y + c->height * ratio) * scale;
+			res = ctx->plot->line(ctx, &plot_style_box, &rect);
+			if (res != NSERROR_OK) {
+				return false;
+			}
+		} else if ((c->type == BOX_INLINE_CONTAINER) || (c->type == BOX_BLOCK)) {
+			if (!html_redraw_text_decoration_block(c,
+					x + c->x, y + c->y,
+					scale, colour, ratio, ctx))
+				return false;
+		}
+	}
+	return true;
+}
+
+
+/**
+ * Plot text decoration for a box.
+ *
+ * \param  box       box to plot decorations for
+ * \param  x_parent  x coordinate of parent of box
+ * \param  y_parent  y coordinate of parent of box
+ * \param  scale     scale for redraw
+ * \param  background_colour  current background colour
+ * \param  ctx	     current redraw context
+ * \return true if successful, false otherwise
+ */
+
+static bool html_redraw_text_decoration(struct box *box,
+		int x_parent, int y_parent, float scale,
+		colour background_colour, const struct redraw_context *ctx)
+{
+	static const enum css_text_decoration_e decoration[] = {
+		CSS_TEXT_DECORATION_UNDERLINE, CSS_TEXT_DECORATION_OVERLINE,
+		CSS_TEXT_DECORATION_LINE_THROUGH };
+	static const float line_ratio[] = { 0.9, 0.1, 0.5 };
+	colour fgcol;
+	unsigned int i;
+	css_color col;
+
+	css_computed_color(box->style, &col);
+	fgcol = nscss_color_to_ns(col);
+
+	/* antialias colour for under/overline */
+	if (html_redraw_printing == false)
+		fgcol = blend_colour(background_colour, fgcol);
+
+	if (box->type == BOX_INLINE) {
+		if (!box->inline_end)
+			return true;
+		for (i = 0; i != NOF_ELEMENTS(decoration); i++)
+			if (css_computed_text_decoration(box->style) &
+					decoration[i])
+				if (!html_redraw_text_decoration_inline(box,
+						x_parent, y_parent, scale,
+						fgcol, line_ratio[i], ctx))
+					return false;
+	} else {
+		for (i = 0; i != NOF_ELEMENTS(decoration); i++)
+			if (css_computed_text_decoration(box->style) &
+					decoration[i])
+				if (!html_redraw_text_decoration_block(box,
+						x_parent + box->x,
+						y_parent + box->y,
+						scale,
+						fgcol, line_ratio[i], ctx))
+					return false;
+	}
+
+	return true;
+}
+
+
+/**
+ * Redraw the text content of a box, possibly partially highlighted
+ * because the text has been selected, or matches a search operation.
+ *
+ * \param html The html content to redraw text within.
+ * \param  box      box with text content
+ * \param  x        x co-ord of box
+ * \param  y        y co-ord of box
+ * \param  clip     current clip rectangle
+ * \param  scale    current scale setting (1.0 = 100%)
+ * \param  current_background_color
+ * \param  ctx	    current redraw context
+ * \return true iff successful and redraw should proceed
+ */
+
+static bool html_redraw_text_box(const html_content *html, struct box *box,
+		int x, int y, const struct rect *clip, float scale,
+		colour current_background_color,
+		const struct redraw_context *ctx)
+{
+	bool excluded = (box->object != NULL);
+	plot_font_style_t fstyle;
+
+	font_plot_style_from_css(&html->len_ctx, box->style, &fstyle);
+	fstyle.background = current_background_color;
+
+	if (!text_redraw(box->text, box->length, box->byte_offset,
+			box->space, &fstyle, x, y,
+			clip, box->height, scale, excluded,
+			(struct content *)html, &html->sel,
+			html->search, ctx))
+		return false;
+
+	return true;
+}
+
+bool html_redraw_box(const html_content *html, struct box *box,
+		int x_parent, int y_parent,
+		const struct rect *clip, float scale,
+		colour current_background_color,
+		const struct redraw_context *ctx);
+
+/**
+ * Draw the various children of a box.
+ *
+ * \param  html	     html content
+ * \param  box	     box to draw children of
+ * \param  x_parent  coordinate of parent box
+ * \param  y_parent  coordinate of parent box
+ * \param  clip      clip rectangle
+ * \param  scale     scale for redraw
+ * \param  current_background_color  background colour under this box
+ * \param  ctx	     current redraw context
+ * \return true if successful, false otherwise
+ */
+
+static bool html_redraw_box_children(const html_content *html, struct box *box,
+		int x_parent, int y_parent,
+		const struct rect *clip, float scale,
+		colour current_background_color,
+		const struct redraw_context *ctx)
+{
+	struct box *c;
+
+	for (c = box->children; c; c = c->next) {
+
+		if (c->type != BOX_FLOAT_LEFT && c->type != BOX_FLOAT_RIGHT)
+			if (!html_redraw_box(html, c,
+					x_parent + box->x -
+					scrollbar_get_offset(box->scroll_x),
+					y_parent + box->y -
+					scrollbar_get_offset(box->scroll_y),
+					clip, scale, current_background_color,
+					ctx))
+				return false;
+	}
+	for (c = box->float_children; c; c = c->next_float)
+		if (!html_redraw_box(html, c,
+				x_parent + box->x -
+				scrollbar_get_offset(box->scroll_x),
+				y_parent + box->y -
+				scrollbar_get_offset(box->scroll_y),
+				clip, scale, current_background_color,
+				ctx))
+			return false;
+
+	return true;
+}
+
+/**
+ * Recursively draw a box.
+ *
+ * \param  html	     html content
+ * \param  box	     box to draw
+ * \param  x_parent  coordinate of parent box
+ * \param  y_parent  coordinate of parent box
+ * \param  clip      clip rectangle
+ * \param  scale     scale for redraw
+ * \param  current_background_color  background colour under this box
+ * \param  ctx	     current redraw context
+ * \return true if successful, false otherwise
+ *
+ * x, y, clip_[xy][01] are in target coordinates.
+ */
+
+bool html_redraw_box(const html_content *html, struct box *box,
+		int x_parent, int y_parent,
+		const struct rect *clip, const float scale,
+		colour current_background_color,
+		const struct redraw_context *ctx)
+{
+	const struct plotter_table *plot = ctx->plot;
+	int x, y;
+	int width, height;
+	int padding_left, padding_top, padding_width, padding_height;
+	int border_left, border_top, border_right, border_bottom;
+	struct rect r;
+	struct rect rect;
+	int x_scrolled, y_scrolled;
+	struct box *bg_box = NULL;
+	bool has_x_scroll, has_y_scroll;
+	css_computed_clip_rect css_rect;
+	enum css_overflow_e overflow_x = CSS_OVERFLOW_VISIBLE;
+	enum css_overflow_e overflow_y = CSS_OVERFLOW_VISIBLE;
+
+	if (html_redraw_printing && (box->flags & PRINTED))
+		return true;
+
+	if (box->style != NULL) {
+		overflow_x = css_computed_overflow_x(box->style);
+		overflow_y = css_computed_overflow_y(box->style);
+	}
+
+	/* avoid trivial FP maths */
+	if (scale == 1.0) {
+		x = x_parent + box->x;
+		y = y_parent + box->y;
+		width = box->width;
+		height = box->height;
+		padding_left = box->padding[LEFT];
+		padding_top = box->padding[TOP];
+		padding_width = padding_left + box->width + box->padding[RIGHT];
+		padding_height = padding_top + box->height +
+				box->padding[BOTTOM];
+		border_left = box->border[LEFT].width;
+		border_top = box->border[TOP].width;
+		border_right = box->border[RIGHT].width;
+		border_bottom = box->border[BOTTOM].width;
+	} else {
+		x = (x_parent + box->x) * scale;
+		y = (y_parent + box->y) * scale;
+		width = box->width * scale;
+		height = box->height * scale;
+		/* left and top padding values are normally zero,
+		 * so avoid trivial FP maths */
+		padding_left = box->padding[LEFT] ? box->padding[LEFT] * scale
+				: 0;
+		padding_top = box->padding[TOP] ? box->padding[TOP] * scale
+				: 0;
+		padding_width = (box->padding[LEFT] + box->width +
+				box->padding[RIGHT]) * scale;
+		padding_height = (box->padding[TOP] + box->height +
+				box->padding[BOTTOM]) * scale;
+		border_left = box->border[LEFT].width * scale;
+		border_top = box->border[TOP].width * scale;
+		border_right = box->border[RIGHT].width * scale;
+		border_bottom = box->border[BOTTOM].width * scale;
+	}
+
+	/* calculate rectangle covering this box and descendants */
+	if (box->style && overflow_x != CSS_OVERFLOW_VISIBLE &&
+			box->parent != NULL) {
+		/* box contents clipped to box size */
+		r.x0 = x - border_left;
+		r.x1 = x + padding_width + border_right;
+	} else {
+		/* box contents can hang out of the box; use descendant box */
+		if (scale == 1.0) {
+			r.x0 = x + box->descendant_x0;
+			r.x1 = x + box->descendant_x1 + 1;
+		} else {
+			r.x0 = x + box->descendant_x0 * scale;
+			r.x1 = x + box->descendant_x1 * scale + 1;
+		}
+		if (!box->parent) {
+			/* root element */
+			int margin_left, margin_right;
+			if (scale == 1.0) {
+				margin_left = box->margin[LEFT];
+				margin_right = box->margin[RIGHT];
+			} else {
+				margin_left = box->margin[LEFT] * scale;
+				margin_right = box->margin[RIGHT] * scale;
+			}
+			r.x0 = x - border_left - margin_left < r.x0 ?
+					x - border_left - margin_left : r.x0;
+			r.x1 = x + padding_width + border_right +
+					margin_right > r.x1 ?
+					x + padding_width + border_right +
+					margin_right : r.x1;
+		}
+	}
+
+	/* calculate rectangle covering this box and descendants */
+	if (box->style && overflow_y != CSS_OVERFLOW_VISIBLE &&
+			box->parent != NULL) {
+		/* box contents clipped to box size */
+		r.y0 = y - border_top;
+		r.y1 = y + padding_height + border_bottom;
+	} else {
+		/* box contents can hang out of the box; use descendant box */
+		if (scale == 1.0) {
+			r.y0 = y + box->descendant_y0;
+			r.y1 = y + box->descendant_y1 + 1;
+		} else {
+			r.y0 = y + box->descendant_y0 * scale;
+			r.y1 = y + box->descendant_y1 * scale + 1;
+		}
+		if (!box->parent) {
+			/* root element */
+			int margin_top, margin_bottom;
+			if (scale == 1.0) {
+				margin_top = box->margin[TOP];
+				margin_bottom = box->margin[BOTTOM];
+			} else {
+				margin_top = box->margin[TOP] * scale;
+				margin_bottom = box->margin[BOTTOM] * scale;
+			}
+			r.y0 = y - border_top - margin_top < r.y0 ?
+					y - border_top - margin_top : r.y0;
+			r.y1 = y + padding_height + border_bottom +
+					margin_bottom > r.y1 ?
+					y + padding_height + border_bottom +
+					margin_bottom : r.y1;
+		}
+	}
+
+	/* return if the rectangle is completely outside the clip rectangle */
+	if (clip->y1 < r.y0 || r.y1 < clip->y0 ||
+			clip->x1 < r.x0 || r.x1 < clip->x0)
+		return true;
+
+	/*if the rectangle is under the page bottom but it can fit in a page,
+	don't print it now*/
+	if (html_redraw_printing) {
+		if (r.y1 > html_redraw_printing_border) {
+			if (r.y1 - r.y0 <= html_redraw_printing_border &&
+					(box->type == BOX_TEXT ||
+					box->type == BOX_TABLE_CELL
+					|| box->object || box->gadget)) {
+				/*remember the highest of all points from the
+				not printed elements*/
+				if (r.y0 < html_redraw_printing_top_cropped)
+					html_redraw_printing_top_cropped = r.y0;
+				return true;
+			}
+		}
+		else box->flags |= PRINTED; /*it won't be printed anymore*/
+	}
+
+	/* if visibility is hidden render children only */
+	if (box->style && css_computed_visibility(box->style) ==
+			CSS_VISIBILITY_HIDDEN) {
+		if ((ctx->plot->group_start) &&
+		    (ctx->plot->group_start(ctx, "hidden box") != NSERROR_OK))
+			return false;
+		if (!html_redraw_box_children(html, box, x_parent, y_parent,
+				&r, scale, current_background_color, ctx))
+			return false;
+		return ((!ctx->plot->group_end) || (ctx->plot->group_end(ctx) == NSERROR_OK));
+	}
+
+	if ((ctx->plot->group_start) &&
+	    (ctx->plot->group_start(ctx,"vis box") != NSERROR_OK)) {
+		return false;
+	}
+
+	if (box->style != NULL &&
+			css_computed_position(box->style) ==
+					CSS_POSITION_ABSOLUTE &&
+			css_computed_clip(box->style, &css_rect) ==
+					CSS_CLIP_RECT) {
+		/* We have an absolutly positioned box with a clip rect */
+		if (css_rect.left_auto == false)
+			r.x0 = x - border_left + FIXTOINT(nscss_len2px(
+					&html->len_ctx,
+					css_rect.left, css_rect.lunit,
+					box->style));
+
+		if (css_rect.top_auto == false)
+			r.y0 = y - border_top + FIXTOINT(nscss_len2px(
+					&html->len_ctx,
+					css_rect.top, css_rect.tunit,
+					box->style));
+
+		if (css_rect.right_auto == false)
+			r.x1 = x - border_left + FIXTOINT(nscss_len2px(
+					&html->len_ctx,
+					css_rect.right, css_rect.runit,
+					box->style));
+
+		if (css_rect.bottom_auto == false)
+			r.y1 = y - border_top + FIXTOINT(nscss_len2px(
+					&html->len_ctx,
+					css_rect.bottom, css_rect.bunit,
+					box->style));
+
+		/* find intersection of clip rectangle and box */
+		if (r.x0 < clip->x0) r.x0 = clip->x0;
+		if (r.y0 < clip->y0) r.y0 = clip->y0;
+		if (clip->x1 < r.x1) r.x1 = clip->x1;
+		if (clip->y1 < r.y1) r.y1 = clip->y1;
+		/* Nothing to do for invalid rectangles */
+		if (r.x0 >= r.x1 || r.y0 >= r.y1)
+			/* not an error */
+			return ((!ctx->plot->group_end) ||
+				(ctx->plot->group_end(ctx) == NSERROR_OK));
+		/* clip to it */
+		if (ctx->plot->clip(ctx, &r) != NSERROR_OK)
+			return false;
+
+	} else if (box->type == BOX_BLOCK || box->type == BOX_INLINE_BLOCK ||
+			box->type == BOX_TABLE_CELL || box->object) {
+		/* find intersection of clip rectangle and box */
+		if (r.x0 < clip->x0) r.x0 = clip->x0;
+		if (r.y0 < clip->y0) r.y0 = clip->y0;
+		if (clip->x1 < r.x1) r.x1 = clip->x1;
+		if (clip->y1 < r.y1) r.y1 = clip->y1;
+		/* no point trying to draw 0-width/height boxes */
+		if (r.x0 == r.x1 || r.y0 == r.y1)
+			/* not an error */
+			return ((!ctx->plot->group_end) ||
+				(ctx->plot->group_end(ctx) == NSERROR_OK));
+		/* clip to it */
+		if (ctx->plot->clip(ctx, &r) != NSERROR_OK)
+			return false;
+	} else {
+		/* clip box is fine, clip to it */
+		r = *clip;
+		if (ctx->plot->clip(ctx, &r) != NSERROR_OK)
+			return false;
+	}
+
+	/* background colour and image for block level content and replaced
+	 * inlines */
+
+	bg_box = html_redraw_find_bg_box(box);
+
+	/* bg_box == NULL implies that this box should not have
+	* its background rendered. Otherwise filter out linebreaks,
+	* optimize away non-differing inlines, only plot background
+	* for BOX_TEXT it's in an inline */
+	if (bg_box && bg_box->type != BOX_BR &&
+			bg_box->type != BOX_TEXT &&
+			bg_box->type != BOX_INLINE_END &&
+			(bg_box->type != BOX_INLINE || bg_box->object ||
+			bg_box->flags & IFRAME || box->flags & REPLACE_DIM ||
+			(bg_box->gadget != NULL &&
+			(bg_box->gadget->type == GADGET_TEXTAREA ||
+			bg_box->gadget->type == GADGET_TEXTBOX ||
+			bg_box->gadget->type == GADGET_PASSWORD)))) {
+		/* find intersection of clip box and border edge */
+		struct rect p;
+		p.x0 = x - border_left < r.x0 ? r.x0 : x - border_left;
+		p.y0 = y - border_top < r.y0 ? r.y0 : y - border_top;
+		p.x1 = x + padding_width + border_right < r.x1 ?
+				x + padding_width + border_right : r.x1;
+		p.y1 = y + padding_height + border_bottom < r.y1 ?
+				y + padding_height + border_bottom : r.y1;
+		if (!box->parent) {
+			/* Root element, special case:
+			 * background covers margins too */
+			int m_left, m_top, m_right, m_bottom;
+			if (scale == 1.0) {
+				m_left = box->margin[LEFT];
+				m_top = box->margin[TOP];
+				m_right = box->margin[RIGHT];
+				m_bottom = box->margin[BOTTOM];
+			} else {
+				m_left = box->margin[LEFT] * scale;
+				m_top = box->margin[TOP] * scale;
+				m_right = box->margin[RIGHT] * scale;
+				m_bottom = box->margin[BOTTOM] * scale;
+			}
+			p.x0 = p.x0 - m_left < r.x0 ? r.x0 : p.x0 - m_left;
+			p.y0 = p.y0 - m_top < r.y0 ? r.y0 : p.y0 - m_top;
+			p.x1 = p.x1 + m_right < r.x1 ? p.x1 + m_right : r.x1;
+			p.y1 = p.y1 + m_bottom < r.y1 ? p.y1 + m_bottom : r.y1;
+		}
+		/* valid clipping rectangles only */
+		if ((p.x0 < p.x1) && (p.y0 < p.y1)) {
+			/* plot background */
+			if (!html_redraw_background(x, y, box, scale, &p,
+					&current_background_color, bg_box,
+					&html->len_ctx, ctx))
+				return false;
+			/* restore previous graphics window */
+			if (ctx->plot->clip(ctx, &r) != NSERROR_OK)
+				return false;
+		}
+	}
+
+	/* borders for block level content and replaced inlines */
+	if (box->style &&
+	    box->type != BOX_TEXT &&
+	    box->type != BOX_INLINE_END &&
+	    (box->type != BOX_INLINE || box->object ||
+	     box->flags & IFRAME || box->flags & REPLACE_DIM ||
+	     (box->gadget != NULL &&
+	      (box->gadget->type == GADGET_TEXTAREA ||
+	       box->gadget->type == GADGET_TEXTBOX ||
+	       box->gadget->type == GADGET_PASSWORD))) &&
+	    (border_top || border_right || border_bottom || border_left)) {
+		if (!html_redraw_borders(box, x_parent, y_parent,
+				padding_width, padding_height, &r,
+				scale, ctx))
+			return false;
+	}
+
+	/* backgrounds and borders for non-replaced inlines */
+	if (box->style && box->type == BOX_INLINE && box->inline_end &&
+			(html_redraw_box_has_background(box) ||
+			border_top || border_right ||
+			border_bottom || border_left)) {
+		/* inline backgrounds and borders span other boxes and may
+		 * wrap onto separate lines */
+		struct box *ib;
+		struct rect b; /* border edge rectangle */
+		struct rect p; /* clipped rect */
+		bool first = true;
+		int ib_x;
+		int ib_y = y;
+		int ib_p_width;
+		int ib_b_left, ib_b_right;
+
+		b.x0 = x - border_left;
+		b.x1 = x + padding_width + border_right;
+		b.y0 = y - border_top;
+		b.y1 = y + padding_height + border_bottom;
+
+		p.x0 = b.x0 < r.x0 ? r.x0 : b.x0;
+		p.x1 = b.x1 < r.x1 ? b.x1 : r.x1;
+		p.y0 = b.y0 < r.y0 ? r.y0 : b.y0;
+		p.y1 = b.y1 < r.y1 ? b.y1 : r.y1;
+		for (ib = box; ib; ib = ib->next) {
+			/* to get extents of rectangle(s) associated with
+			 * inline, cycle though all boxes in inline, skipping
+			 * over floats */
+			if (ib->type == BOX_FLOAT_LEFT ||
+					ib->type == BOX_FLOAT_RIGHT)
+				continue;
+			if (scale == 1.0) {
+				ib_x = x_parent + ib->x;
+				ib_y = y_parent + ib->y;
+				ib_p_width = ib->padding[LEFT] + ib->width +
+						ib->padding[RIGHT];
+				ib_b_left = ib->border[LEFT].width;
+				ib_b_right = ib->border[RIGHT].width;
+			} else {
+				ib_x = (x_parent + ib->x) * scale;
+				ib_y = (y_parent + ib->y) * scale;
+				ib_p_width = (ib->padding[LEFT] + ib->width +
+						ib->padding[RIGHT]) * scale;
+				ib_b_left = ib->border[LEFT].width * scale;
+				ib_b_right = ib->border[RIGHT].width * scale;
+			}
+
+			if ((ib->flags & NEW_LINE) && ib != box) {
+				/* inline element has wrapped, plot background
+				 * and borders */
+				if (!html_redraw_inline_background(
+						x, y, box, scale, &p, b,
+						first, false,
+						&current_background_color,
+						&html->len_ctx, ctx))
+					return false;
+				/* restore previous graphics window */
+				if (ctx->plot->clip(ctx, &r) != NSERROR_OK)
+					return false;
+				if (!html_redraw_inline_borders(box, b, &r,
+						scale, first, false, ctx))
+					return false;
+				/* reset coords */
+				b.x0 = ib_x - ib_b_left;
+				b.y0 = ib_y - border_top - padding_top;
+				b.y1 = ib_y + padding_height - padding_top +
+						border_bottom;
+
+				p.x0 = b.x0 < r.x0 ? r.x0 : b.x0;
+				p.y0 = b.y0 < r.y0 ? r.y0 : b.y0;
+				p.y1 = b.y1 < r.y1 ? b.y1 : r.y1;
+
+				first = false;
+			}
+
+			/* increase width for current box */
+			b.x1 = ib_x + ib_p_width + ib_b_right;
+			p.x1 = b.x1 < r.x1 ? b.x1 : r.x1;
+
+			if (ib == box->inline_end)
+				/* reached end of BOX_INLINE span */
+				break;
+		}
+		/* plot background and borders for last rectangle of
+		 * the inline */
+		if (!html_redraw_inline_background(x, ib_y, box, scale, &p, b,
+				first, true, &current_background_color,
+				&html->len_ctx, ctx))
+			return false;
+		/* restore previous graphics window */
+		if (ctx->plot->clip(ctx, &r) != NSERROR_OK)
+			return false;
+		if (!html_redraw_inline_borders(box, b, &r, scale, first, true,
+				ctx))
+			return false;
+
+	}
+
+	/* Debug outlines */
+	if (html_redraw_debug) {
+		int margin_left, margin_right;
+		int margin_top, margin_bottom;
+		if (scale == 1.0) {
+			/* avoid trivial fp maths */
+			margin_left = box->margin[LEFT];
+			margin_top = box->margin[TOP];
+			margin_right = box->margin[RIGHT];
+			margin_bottom = box->margin[BOTTOM];
+		} else {
+			margin_left = box->margin[LEFT] * scale;
+			margin_top = box->margin[TOP] * scale;
+			margin_right = box->margin[RIGHT] * scale;
+			margin_bottom = box->margin[BOTTOM] * scale;
+		}
+		/* Content edge -- blue */
+		rect.x0 = x + padding_left;
+		rect.y0 = y + padding_top;
+		rect.x1 = x + padding_left + width;
+		rect.y1 = y + padding_top + height;
+		if (ctx->plot->rectangle(ctx, plot_style_content_edge, &rect) != NSERROR_OK)
+			return false;
+
+		/* Padding edge -- red */
+		rect.x0 = x;
+		rect.y0 = y;
+		rect.x1 = x + padding_width;
+		rect.y1 = y + padding_height;
+		if (ctx->plot->rectangle(ctx, plot_style_padding_edge, &rect) != NSERROR_OK)
+			return false;
+
+		/* Margin edge -- yellow */
+		rect.x0 = x - border_left - margin_left;
+		rect.y0 = y - border_top - margin_top;
+		rect.x1 = x + padding_width + border_right + margin_right;
+		rect.y1 = y + padding_height + border_bottom + margin_bottom;
+		if (ctx->plot->rectangle(ctx, plot_style_margin_edge, &rect) != NSERROR_OK)
+			return false;
+	}
+
+	/* clip to the padding edge for objects, or boxes with overflow hidden
+	 * or scroll, unless it's the root element */
+	if (box->parent != NULL) {
+		bool need_clip = false;
+		if (box->object || box->flags & IFRAME ||
+				(overflow_x != CSS_OVERFLOW_VISIBLE &&
+				 overflow_y != CSS_OVERFLOW_VISIBLE)) {
+			r.x0 = x;
+			r.y0 = y;
+			r.x1 = x + padding_width;
+			r.y1 = y + padding_height;
+			if (r.x0 < clip->x0) r.x0 = clip->x0;
+			if (r.y0 < clip->y0) r.y0 = clip->y0;
+			if (clip->x1 < r.x1) r.x1 = clip->x1;
+			if (clip->y1 < r.y1) r.y1 = clip->y1;
+			if (r.x1 <= r.x0 || r.y1 <= r.y0) {
+				return (!ctx->plot->group_end ||
+					(ctx->plot->group_end(ctx) == NSERROR_OK));
+			}
+			need_clip = true;
+
+		} else if (overflow_x != CSS_OVERFLOW_VISIBLE) {
+			r.x0 = x;
+			r.y0 = clip->y0;
+			r.x1 = x + padding_width;
+			r.y1 = clip->y1;
+			if (r.x0 < clip->x0) r.x0 = clip->x0;
+			if (clip->x1 < r.x1) r.x1 = clip->x1;
+			if (r.x1 <= r.x0) {
+				return (!ctx->plot->group_end ||
+					(ctx->plot->group_end(ctx) == NSERROR_OK));
+			}
+			need_clip = true;
+
+		} else if (overflow_y != CSS_OVERFLOW_VISIBLE) {
+			r.x0 = clip->x0;
+			r.y0 = y;
+			r.x1 = clip->x1;
+			r.y1 = y + padding_height;
+			if (r.y0 < clip->y0) r.y0 = clip->y0;
+			if (clip->y1 < r.y1) r.y1 = clip->y1;
+			if (r.y1 <= r.y0) {
+				return (!ctx->plot->group_end ||
+					(ctx->plot->group_end(ctx) == NSERROR_OK));
+			}
+			need_clip = true;
+		}
+
+		if (need_clip &&
+		    (box->type == BOX_BLOCK ||
+		     box->type == BOX_INLINE_BLOCK ||
+		     box->type == BOX_TABLE_CELL || box->object)) {
+			if (ctx->plot->clip(ctx, &r) != NSERROR_OK)
+				return false;
+		}
+	}
+
+	/* text decoration */
+	if ((box->type != BOX_TEXT) &&
+	    box->style &&
+	    css_computed_text_decoration(box->style) !=	CSS_TEXT_DECORATION_NONE) {
+		if (!html_redraw_text_decoration(box, x_parent, y_parent,
+				scale, current_background_color, ctx))
+			return false;
+	}
+
+	if (box->object && width != 0 && height != 0) {
+		struct content_redraw_data obj_data;
+
+		x_scrolled = x - scrollbar_get_offset(box->scroll_x) * scale;
+		y_scrolled = y - scrollbar_get_offset(box->scroll_y) * scale;
+
+		obj_data.x = x_scrolled + padding_left;
+		obj_data.y = y_scrolled + padding_top;
+		obj_data.width = width;
+		obj_data.height = height;
+		obj_data.background_colour = current_background_color;
+		obj_data.scale = scale;
+		obj_data.repeat_x = false;
+		obj_data.repeat_y = false;
+
+		if (content_get_type(box->object) == CONTENT_HTML) {
+			obj_data.x /= scale;
+			obj_data.y /= scale;
+		}
+
+		if (!content_redraw(box->object, &obj_data, &r, ctx)) {
+			/* Show image fail */
+			/* Unicode (U+FFFC) 'OBJECT REPLACEMENT CHARACTER' */
+			const char *obj = "\xef\xbf\xbc";
+			int obj_width;
+			int obj_x = x + padding_left;
+			nserror res;
+
+			rect.x0 = x + padding_left;
+			rect.y0 = y + padding_top;
+			rect.x1 = x + padding_left + width - 1;
+			rect.y1 = y + padding_top + height - 1;
+			res = ctx->plot->rectangle(ctx, plot_style_broken_object, &rect);
+			if (res != NSERROR_OK) {
+				return false;
+			}
+
+			res = guit->layout->width(plot_fstyle_broken_object,
+						  obj,
+						  sizeof(obj) - 1,
+						  &obj_width);
+			if (res != NSERROR_OK) {
+				obj_x += 1;
+			} else {
+				obj_x += width / 2 - obj_width / 2;
+			}
+
+			if (ctx->plot->text(ctx,
+					    plot_fstyle_broken_object,
+					    obj_x, y + padding_top + (int)(height * 0.75),
+					    obj, sizeof(obj) - 1) != NSERROR_OK)
+				return false;
+		}
+
+	} else if (box->iframe) {
+		/* Offset is passed to browser window redraw unscaled */
+		browser_window_redraw(box->iframe,
+				(x + padding_left) / scale,
+				(y + padding_top) / scale, &r, ctx);
+
+	} else if (box->gadget && box->gadget->type == GADGET_CHECKBOX) {
+		if (!html_redraw_checkbox(x + padding_left, y + padding_top,
+				width, height, box->gadget->selected, ctx))
+			return false;
+
+	} else if (box->gadget && box->gadget->type == GADGET_RADIO) {
+		if (!html_redraw_radio(x + padding_left, y + padding_top,
+				width, height, box->gadget->selected, ctx))
+			return false;
+
+	} else if (box->gadget && box->gadget->type == GADGET_FILE) {
+		if (!html_redraw_file(x + padding_left, y + padding_top,
+				width, height, box, scale,
+				current_background_color, &html->len_ctx, ctx))
+			return false;
+
+	} else if (box->gadget &&
+			(box->gadget->type == GADGET_TEXTAREA ||
+			box->gadget->type == GADGET_PASSWORD ||
+			box->gadget->type == GADGET_TEXTBOX)) {
+		textarea_redraw(box->gadget->data.text.ta, x, y,
+				current_background_color, scale, &r, ctx);
+
+	} else if (box->text) {
+		if (!html_redraw_text_box(html, box, x, y, &r, scale,
+				current_background_color, ctx))
+			return false;
+
+	} else {
+		if (!html_redraw_box_children(html, box, x_parent, y_parent, &r,
+				scale, current_background_color, ctx))
+			return false;
+	}
+
+	if (box->type == BOX_BLOCK || box->type == BOX_INLINE_BLOCK ||
+			box->type == BOX_TABLE_CELL || box->type == BOX_INLINE)
+		if (ctx->plot->clip(ctx, clip) != NSERROR_OK)
+			return false;
+
+	/* list marker */
+	if (box->list_marker) {
+		if (!html_redraw_box(html, box->list_marker,
+				x_parent + box->x -
+				scrollbar_get_offset(box->scroll_x),
+				y_parent + box->y -
+				scrollbar_get_offset(box->scroll_y),
+				clip, scale, current_background_color, ctx))
+			return false;
+	}
+
+	/* scrollbars */
+	if (((box->style && box->type != BOX_BR &&
+			box->type != BOX_TABLE && box->type != BOX_INLINE &&
+			(overflow_x == CSS_OVERFLOW_SCROLL ||
+			 overflow_x == CSS_OVERFLOW_AUTO ||
+			 overflow_y == CSS_OVERFLOW_SCROLL ||
+			 overflow_y == CSS_OVERFLOW_AUTO)) ||
+			(box->object && content_get_type(box->object) ==
+			CONTENT_HTML)) && box->parent != NULL) {
+
+		has_x_scroll = box_hscrollbar_present(box);
+		has_y_scroll = box_vscrollbar_present(box);
+
+		if (!box_handle_scrollbars((struct content *)html,
+				box, has_x_scroll, has_y_scroll))
+			return false;
+
+		if (box->scroll_x != NULL)
+			scrollbar_redraw(box->scroll_x,
+					x_parent + box->x,
+					y_parent + box->y + box->padding[TOP] +
+					box->height + box->padding[BOTTOM] -
+					SCROLLBAR_WIDTH, clip, scale, ctx);
+		if (box->scroll_y != NULL)
+			scrollbar_redraw(box->scroll_y,
+					x_parent + box->x + box->padding[LEFT] +
+					box->width + box->padding[RIGHT] -
+					SCROLLBAR_WIDTH,
+					y_parent + box->y, clip, scale, ctx);
+	}
+
+	if (box->type == BOX_BLOCK || box->type == BOX_INLINE_BLOCK ||
+	    box->type == BOX_TABLE_CELL || box->type == BOX_INLINE) {
+		if (ctx->plot->clip(ctx, clip) != NSERROR_OK)
+			return false;
+	}
+
+	return ((!plot->group_end) || (ctx->plot->group_end(ctx) == NSERROR_OK));
+}
+
+/**
+ * Draw a CONTENT_HTML using the current set of plotters (plot).
+ *
+ * \param  c	 content of type CONTENT_HTML
+ * \param  data	 redraw data for this content redraw
+ * \param  clip	 current clip region
+ * \param  ctx	 current redraw context
+ * \return true if successful, false otherwise
+ *
+ * x, y, clip_[xy][01] are in target coordinates.
+ */
+
+bool html_redraw(struct content *c, struct content_redraw_data *data,
+		const struct rect *clip, const struct redraw_context *ctx)
+{
+	html_content *html = (html_content *) c;
+	struct box *box;
+	bool result = true;
+	bool select, select_only;
+	plot_style_t pstyle_fill_bg = {
+		.fill_type = PLOT_OP_TYPE_SOLID,
+		.fill_colour = data->background_colour,
+	};
+
+	box = html->layout;
+	assert(box);
+
+	/* The select menu needs special treating because, when opened, it
+	 * reaches beyond its layout box.
+	 */
+	select = false;
+	select_only = false;
+	if (ctx->interactive && html->visible_select_menu != NULL) {
+		struct form_control *control = html->visible_select_menu;
+		select = true;
+		/* check if the redraw rectangle is completely inside of the
+		   select menu */
+		select_only = form_clip_inside_select_menu(control,
+				data->scale, clip);
+	}
+
+	if (!select_only) {
+		/* clear to background colour */
+		result = (ctx->plot->clip(ctx, clip) == NSERROR_OK);
+
+		if (html->background_colour != NS_TRANSPARENT)
+			pstyle_fill_bg.fill_colour = html->background_colour;
+
+		result &= (ctx->plot->rectangle(ctx, &pstyle_fill_bg, clip) == NSERROR_OK);
+
+		result &= html_redraw_box(html, box, data->x, data->y, clip,
+				data->scale, pstyle_fill_bg.fill_colour, ctx);
+	}
+
+	if (select) {
+		int menu_x, menu_y;
+		box = html->visible_select_menu->box;
+		box_coords(box, &menu_x, &menu_y);
+
+		menu_x -= box->border[LEFT].width;
+		menu_y += box->height + box->border[BOTTOM].width +
+				box->padding[BOTTOM] + box->padding[TOP];
+		result &= form_redraw_select_menu(html->visible_select_menu,
+				data->x + menu_x, data->y + menu_y,
+				data->scale, clip, ctx);
+	}
+
+	return result;
+
+}