mirror of
https://github.com/netsurf-browser/netsurf
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177 lines
4.1 KiB
C
177 lines
4.1 KiB
C
/*
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* Copyright 2009 John-Mark Bell <jmb@netsurf-browser.org>
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*
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* This file is part of NetSurf, http://www.netsurf-browser.org/
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*
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* NetSurf is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* NetSurf is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef NETSURF_CSS_UTILS_H_
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#define NETSURF_CSS_UTILS_H_
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#include <libcss/libcss.h>
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#include "netsurf/css.h"
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/** DPI of the screen, in fixed point units */
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extern css_fixed nscss_screen_dpi;
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/** Medium screen density for device viewing distance. */
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extern css_fixed nscss_baseline_pixel_density;
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/**
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* Length conversion context data.
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*/
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typedef struct nscss_len_ctx {
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/**
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* Viewport width in px.
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* Only used if unit is vh, vw, vi, vb, vmin, or vmax.
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*/
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int vw;
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/**
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* Viewport height in px.
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* Only used if unit is vh, vw, vi, vb, vmin, or vmax.
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*/
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int vh;
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/**
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* Computed style for the document root element.
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* May be NULL if unit is not rem, or rlh.
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*/
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const css_computed_style *root_style;
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} nscss_len_ctx;
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/**
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* Convert an absolute CSS length to points.
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*
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* \param[in] ctx Length conversion context.
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* \param[in] length Absolute CSS length.
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* \param[in] unit Unit of the length.
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* \return length in points
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*/
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css_fixed nscss_len2pt(
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const nscss_len_ctx *ctx,
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css_fixed length,
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css_unit unit);
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/**
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* Convert a CSS length to pixels.
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*
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* \param[in] ctx Length conversion context.
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* \param[in] length Length to convert.
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* \param[in] unit Corresponding unit.
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* \param[in] style Computed style applying to length.
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* May be NULL if unit is not em, ex, cap, ch, or ic.
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* \return length in pixels
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*/
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css_fixed nscss_len2px(
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const nscss_len_ctx *ctx,
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css_fixed length,
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css_unit unit,
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const css_computed_style *style);
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/**
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* Convert css pixels to physical pixels.
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*
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* \param[in] css_pixels Length in css pixels.
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* \return length in physical pixels
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*/
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static inline css_fixed nscss_pixels_css_to_physical(
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css_fixed css_pixels)
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{
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return FDIV(FMUL(css_pixels, nscss_screen_dpi),
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nscss_baseline_pixel_density);
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}
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/**
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* Convert physical pixels to css pixels.
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*
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* \param[in] physical_pixels Length in physical pixels.
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* \return length in css pixels
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*/
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static inline css_fixed nscss_pixels_physical_to_css(
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css_fixed physical_pixels)
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{
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return FDIV(FMUL(physical_pixels, nscss_baseline_pixel_density),
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nscss_screen_dpi);
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}
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/**
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* Temporary helper wrappers for for libcss computed style getter, while
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* we don't support flexbox related property values.
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*/
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static inline uint8_t ns_computed_display(
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const css_computed_style *style, bool root)
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{
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uint8_t value = css_computed_display(style, root);
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if (value == CSS_DISPLAY_FLEX) {
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return CSS_DISPLAY_BLOCK;
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} else if (value == CSS_DISPLAY_INLINE_FLEX) {
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return CSS_DISPLAY_INLINE_BLOCK;
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}
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return value;
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}
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static inline uint8_t ns_computed_display_static(
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const css_computed_style *style)
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{
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uint8_t value = css_computed_display_static(style);
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if (value == CSS_DISPLAY_FLEX) {
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return CSS_DISPLAY_BLOCK;
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} else if (value == CSS_DISPLAY_INLINE_FLEX) {
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return CSS_DISPLAY_INLINE_BLOCK;
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}
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return value;
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}
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static inline uint8_t ns_computed_min_height(
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const css_computed_style *style,
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css_fixed *length, css_unit *unit)
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{
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uint8_t value = css_computed_min_height(style, length, unit);
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if (value == CSS_MIN_HEIGHT_AUTO) {
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value = CSS_MIN_HEIGHT_SET;
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*length = 0;
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*unit = CSS_UNIT_PX;
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}
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return value;
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}
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static inline uint8_t ns_computed_min_width(
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const css_computed_style *style,
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css_fixed *length, css_unit *unit)
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{
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uint8_t value = css_computed_min_width(style, length, unit);
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if (value == CSS_MIN_WIDTH_AUTO) {
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value = CSS_MIN_WIDTH_SET;
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*length = 0;
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*unit = CSS_UNIT_PX;
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}
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return value;
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}
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#endif
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