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Diffstat (limited to 'css/utils.c')
| -rw-r--r-- | css/utils.c | 142 |
1 files changed, 0 insertions, 142 deletions
diff --git a/css/utils.c b/css/utils.c deleted file mode 100644 index 9bf743cac..000000000 --- a/css/utils.c +++ /dev/null @@ -1,142 +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 "css/utils.h" - -#include "utils/nsoption.h" -#include "utils/log.h" - -/** Screen DPI in fixed point units: defaults to 90, which RISC OS uses */ -css_fixed nscss_screen_dpi = F_90; - -/** - * Convert an absolute CSS length to points. - * - * \param length Length to convert - * \param unit Corresponding unit - * \return length in points - */ -css_fixed nscss_len2pt(css_fixed length, css_unit unit) -{ - /* Length must not be relative */ - assert(unit != CSS_UNIT_EM && unit != CSS_UNIT_EX); - - 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), nscss_screen_dpi); - /* 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))); - case CSS_UNIT_PT: return length; - /* 1pc = 12pt */ - case CSS_UNIT_PC: return FMUL(length, INTTOFIX(12)); - default: break; - } - - return 0; -} - - -/** - * Convert a CSS length to pixels. - * - * \param length Length to convert - * \param unit Corresponding unit - * \param style Computed style applying to length. May be NULL if unit is - * neither em nor ex - * \return length in pixels - */ -css_fixed nscss_len2px(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; - - assert(style != NULL || (unit != CSS_UNIT_EM && unit != CSS_UNIT_EX)); - - switch (unit) { - case CSS_UNIT_EM: - case CSS_UNIT_EX: - { - css_fixed font_size = 0; - css_unit font_unit = CSS_UNIT_PT; - - css_computed_font_size(style, &font_size, &font_unit); - - /* Convert to points */ - font_size = nscss_len2pt(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, nscss_screen_dpi), F_72); - - /* Scale ex units: we use a fixed ratio of 1ex = 0.6em */ - if (unit == CSS_UNIT_EX) - px_per_unit = FMUL(px_per_unit, FLTTOFIX(0.6)); - } - break; - case CSS_UNIT_PX: - px_per_unit = F_1; - break; - /* 1in = DPIpx */ - case CSS_UNIT_IN: - px_per_unit = nscss_screen_dpi; - break; - /* 1in = 2.54cm => 1cm = (DPI/2.54)px */ - case CSS_UNIT_CM: - px_per_unit = FDIV(nscss_screen_dpi, FLTTOFIX(2.54)); - break; - /* 1in = 25.4mm => 1mm = (DPI/25.4)px */ - case CSS_UNIT_MM: - px_per_unit = FDIV(nscss_screen_dpi, FLTTOFIX(25.4)); - break; - /* 1in = 72pt => 1pt = (DPI/72)px */ - case CSS_UNIT_PT: - px_per_unit = FDIV(nscss_screen_dpi, F_72); - break; - /* 1pc = 12pt => 1in = 6pc => 1pc = (DPI/6)px */ - case CSS_UNIT_PC: - px_per_unit = FDIV(nscss_screen_dpi, INTTOFIX(6)); - break; - default: - px_per_unit = 0; - break; - } - - /* 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)); -} - |