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-rw-r--r--content/handlers/css/utils.c242
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diff --git a/content/handlers/css/utils.c b/content/handlers/css/utils.c
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--- a/content/handlers/css/utils.c
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@@ -1,242 +0,0 @@
-/*
- * Copyright 2004 James Bursa <james@netsurf-browser.org>
- * Copyright 2009 John-Mark Bell <jmb@netsurf-browser.org>
- *
- * 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/>.
- */
-
-#include <assert.h>
-
-#include "utils/nsoption.h"
-#include "utils/log.h"
-
-#include "css/utils.h"
-
-/** Screen DPI in fixed point units: defaults to 90, which RISC OS uses */
-css_fixed nscss_screen_dpi = F_90;
-
-/** Medium screen density for device viewing distance. */
-css_fixed nscss_baseline_pixel_density = F_96;
-
-/**
- * Map viewport-relative length units to either vh or vw.
- *
- * Non-viewport-relative units are unchanged.
- *
- * \param[in] ctx Length conversion context.
- * \param[in] unit Unit to map.
- * \return the mapped unit.
- */
-static inline css_unit css_utils__fudge_viewport_units(
- const nscss_len_ctx *ctx,
- css_unit unit)
-{
- switch (unit) {
- case CSS_UNIT_VI:
- assert(ctx->root_style != NULL);
- if (css_computed_writing_mode(ctx->root_style) ==
- CSS_WRITING_MODE_HORIZONTAL_TB) {
- unit = CSS_UNIT_VW;
- } else {
- unit = CSS_UNIT_VH;
- }
- break;
- case CSS_UNIT_VB:
- assert(ctx->root_style != NULL);
- if (css_computed_writing_mode(ctx->root_style) ==
- CSS_WRITING_MODE_HORIZONTAL_TB) {
- unit = CSS_UNIT_VH;
- } else {
- unit = CSS_UNIT_VW;
- }
- break;
- case CSS_UNIT_VMIN:
- if (ctx->vh < ctx->vw) {
- unit = CSS_UNIT_VH;
- } else {
- unit = CSS_UNIT_VW;
- }
- break;
- case CSS_UNIT_VMAX:
- if (ctx->vh > ctx->vw) {
- unit = CSS_UNIT_VH;
- } else {
- unit = CSS_UNIT_VW;
- }
- break;
- default: break;
- }
-
- return unit;
-}
-
-/* exported interface documented in content/handlers/css/utils.h */
-css_fixed nscss_len2pt(
- const nscss_len_ctx *ctx,
- css_fixed length,
- css_unit unit)
-{
- /* Length must not be relative */
- assert(unit != CSS_UNIT_EM &&
- unit != CSS_UNIT_EX &&
- unit != CSS_UNIT_CH &&
- unit != CSS_UNIT_REM);
-
- unit = css_utils__fudge_viewport_units(ctx, unit);
-
- switch (unit) {
- /* We assume the screen and any other output has the same dpi */
- /* 1in = DPIpx => 1px = (72/DPI)pt */
- case CSS_UNIT_PX: return FDIV(FMUL(length, F_72), F_96);
- /* 1in = 72pt */
- case CSS_UNIT_IN: return FMUL(length, F_72);
- /* 1in = 2.54cm => 1cm = (72/2.54)pt */
- case CSS_UNIT_CM: return FMUL(length,
- FDIV(F_72, FLTTOFIX(2.54)));
- /* 1in = 25.4mm => 1mm = (72/25.4)pt */
- case CSS_UNIT_MM: return FMUL(length,
- FDIV(F_72, FLTTOFIX(25.4)));
- /* 1in = 101.6q => 1mm = (72/101.6)pt */
- case CSS_UNIT_Q: return FMUL(length,
- FDIV(F_72, FLTTOFIX(101.6)));
- case CSS_UNIT_PT: return length;
- /* 1pc = 12pt */
- case CSS_UNIT_PC: return FMUL(length, INTTOFIX(12));
- case CSS_UNIT_VH: return FDIV(FMUL(FDIV(FMUL(length, ctx->vh), F_100), F_72), F_96);
- case CSS_UNIT_VW: return FDIV(FMUL(FDIV(FMUL(length,ctx->vw), F_100), F_72), F_96);
- default: break;
- }
-
- return 0;
-}
-
-/* exported interface documented in content/handlers/css/utils.h */
-css_fixed nscss_len2px(
- const nscss_len_ctx *ctx,
- css_fixed length,
- css_unit unit,
- const css_computed_style *style)
-{
- /* We assume the screen and any other output has the same dpi */
- css_fixed px_per_unit;
-
- unit = css_utils__fudge_viewport_units(ctx, unit);
-
- switch (unit) {
- case CSS_UNIT_EM:
- case CSS_UNIT_EX:
- case CSS_UNIT_CH:
- {
- css_fixed font_size = 0;
- css_unit font_unit = CSS_UNIT_PT;
-
- assert(style != NULL);
-
- css_computed_font_size(style, &font_size, &font_unit);
-
- /* Convert to points */
- font_size = nscss_len2pt(ctx, font_size, font_unit);
-
- /* Clamp to configured minimum */
- if (font_size < FDIV(INTTOFIX(nsoption_int(font_min_size)), F_10)) {
- font_size = FDIV(INTTOFIX(nsoption_int(font_min_size)), F_10);
- }
-
- /* Convert to pixels (manually, to maximise precision)
- * 1in = 72pt => 1pt = (DPI/72)px */
- px_per_unit = FDIV(FMUL(font_size, F_96), F_72);
-
- /* Scale non-em units to em. We have fixed ratios. */
- switch (unit) {
- case CSS_UNIT_EX:
- px_per_unit = FMUL(px_per_unit, FLTTOFIX(0.6));
- break;
- case CSS_UNIT_CH:
- px_per_unit = FMUL(px_per_unit, FLTTOFIX(0.4));
- break;
- default: break;
- }
- }
- break;
- case CSS_UNIT_PX:
- px_per_unit = F_1;
- break;
- /* 1in = 96 CSS pixels */
- case CSS_UNIT_IN:
- px_per_unit = F_96;
- break;
- /* 1in = 2.54cm => 1cm = (DPI/2.54)px */
- case CSS_UNIT_CM:
- px_per_unit = FDIV(F_96, FLTTOFIX(2.54));
- break;
- /* 1in = 25.4mm => 1mm = (DPI/25.4)px */
- case CSS_UNIT_MM:
- px_per_unit = FDIV(F_96, FLTTOFIX(25.4));
- break;
- /* 1in = 101.6q => 1q = (DPI/101.6)px */
- case CSS_UNIT_Q:
- px_per_unit = FDIV(F_96, FLTTOFIX(101.6));
- break;
- /* 1in = 72pt => 1pt = (DPI/72)px */
- case CSS_UNIT_PT:
- px_per_unit = FDIV(F_96, F_72);
- break;
- /* 1pc = 12pt => 1in = 6pc => 1pc = (DPI/6)px */
- case CSS_UNIT_PC:
- px_per_unit = FDIV(F_96, INTTOFIX(6));
- break;
- case CSS_UNIT_REM:
- {
- css_fixed font_size = 0;
- css_unit font_unit = CSS_UNIT_PT;
-
- assert(ctx->root_style != NULL);
-
- css_computed_font_size(ctx->root_style,
- &font_size, &font_unit);
-
- /* Convert to points */
- font_size = nscss_len2pt(ctx, font_size, font_unit);
-
- /* Clamp to configured minimum */
- if (font_size < FDIV(INTTOFIX(nsoption_int(font_min_size)), F_10)) {
- font_size = FDIV(INTTOFIX(nsoption_int(font_min_size)), F_10);
- }
-
- /* Convert to pixels (manually, to maximise precision)
- * 1in = 72pt => 1pt = (DPI/72)px */
- px_per_unit = FDIV(FMUL(font_size, F_96), F_72);
- break;
- }
- case CSS_UNIT_VH:
- px_per_unit = FDIV(ctx->vh, F_100);
- break;
- case CSS_UNIT_VW:
- px_per_unit = FDIV(ctx->vw, F_100);
- break;
- default:
- px_per_unit = 0;
- break;
- }
-
- px_per_unit = nscss_pixels_css_to_physical(px_per_unit);
-
- /* Ensure we round px_per_unit to the nearest whole number of pixels:
- * the use of FIXTOINT() below will truncate. */
- px_per_unit += F_0_5;
-
- /* Calculate total number of pixels */
- return FMUL(length, TRUNCATEFIX(px_per_unit));
-}
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