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netsurf/content/handlers/html/font.c
2021-05-30 11:52:33 +01:00

166 lines
3.9 KiB
C

/*
* 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/>.
*/
/**
* \file
*
* HTML internal font handling implementation.
*/
#include "utils/nsoption.h"
#include "netsurf/plot_style.h"
#include "css/utils.h"
#include "html/font.h"
/**
* Map a generic CSS font family to a generic plot font family
*
* \param css Generic CSS font family
* \return Plot font family
*/
static plot_font_generic_family_t
plot_font_generic_family(enum css_font_family_e css)
{
plot_font_generic_family_t plot;
switch (css) {
case CSS_FONT_FAMILY_SERIF:
plot = PLOT_FONT_FAMILY_SERIF;
break;
case CSS_FONT_FAMILY_MONOSPACE:
plot = PLOT_FONT_FAMILY_MONOSPACE;
break;
case CSS_FONT_FAMILY_CURSIVE:
plot = PLOT_FONT_FAMILY_CURSIVE;
break;
case CSS_FONT_FAMILY_FANTASY:
plot = PLOT_FONT_FAMILY_FANTASY;
break;
case CSS_FONT_FAMILY_SANS_SERIF:
default:
plot = PLOT_FONT_FAMILY_SANS_SERIF;
break;
}
return plot;
}
/**
* Map a CSS font weight to a plot weight value
*
* \param css CSS font weight
* \return Plot weight
*/
static int plot_font_weight(enum css_font_weight_e css)
{
int weight;
switch (css) {
case CSS_FONT_WEIGHT_100:
weight = 100;
break;
case CSS_FONT_WEIGHT_200:
weight = 200;
break;
case CSS_FONT_WEIGHT_300:
weight = 300;
break;
case CSS_FONT_WEIGHT_400:
case CSS_FONT_WEIGHT_NORMAL:
default:
weight = 400;
break;
case CSS_FONT_WEIGHT_500:
weight = 500;
break;
case CSS_FONT_WEIGHT_600:
weight = 600;
break;
case CSS_FONT_WEIGHT_700:
case CSS_FONT_WEIGHT_BOLD:
weight = 700;
break;
case CSS_FONT_WEIGHT_800:
weight = 800;
break;
case CSS_FONT_WEIGHT_900:
weight = 900;
break;
}
return weight;
}
/**
* Map a CSS font style and font variant to plot font flags
*
* \param style CSS font style
* \param variant CSS font variant
* \return Computed plot flags
*/
static plot_font_flags_t plot_font_flags(enum css_font_style_e style,
enum css_font_variant_e variant)
{
plot_font_flags_t flags = FONTF_NONE;
if (style == CSS_FONT_STYLE_ITALIC)
flags |= FONTF_ITALIC;
else if (style == CSS_FONT_STYLE_OBLIQUE)
flags |= FONTF_OBLIQUE;
if (variant == CSS_FONT_VARIANT_SMALL_CAPS)
flags |= FONTF_SMALLCAPS;
return flags;
}
/* exported function documented in html/font.h */
void font_plot_style_from_css(
const css_unit_ctx *unit_len_ctx,
const css_computed_style *css,
plot_font_style_t *fstyle)
{
lwc_string **families;
css_fixed length = 0;
css_unit unit = CSS_UNIT_PX;
css_color col;
fstyle->family = plot_font_generic_family(
css_computed_font_family(css, &families));
fstyle->families = families;
css_computed_font_size(css, &length, &unit);
fstyle->size = FIXTOINT(FMUL(css_unit_font_size_len2pt(css,
unit_len_ctx, length, unit),
INTTOFIX(PLOT_STYLE_SCALE)));
/* Clamp font size to configured minimum */
if (fstyle->size < (nsoption_int(font_min_size) * PLOT_STYLE_SCALE) / 10)
fstyle->size = (nsoption_int(font_min_size) * PLOT_STYLE_SCALE) / 10;
fstyle->weight = plot_font_weight(css_computed_font_weight(css));
fstyle->flags = plot_font_flags(css_computed_font_style(css),
css_computed_font_variant(css));
css_computed_color(css, &col);
fstyle->foreground = nscss_color_to_ns(col);
fstyle->background = 0;
}