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Diffstat (limited to 'content/handlers/html/font.c')
| -rw-r--r-- | content/handlers/html/font.c | 163 |
1 files changed, 163 insertions, 0 deletions
diff --git a/content/handlers/html/font.c b/content/handlers/html/font.c new file mode 100644 index 000000000..9dbf5922b --- /dev/null +++ b/content/handlers/html/font.c @@ -0,0 +1,163 @@ +/* + * 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 nscss_len_ctx *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)); + + css_computed_font_size(css, &length, &unit); + fstyle->size = FIXTOINT(FMUL(nscss_len2pt(len_ctx, length, unit), + INTTOFIX(FONT_SIZE_SCALE))); + + /* Clamp font size to configured minimum */ + if (fstyle->size < (nsoption_int(font_min_size) * FONT_SIZE_SCALE) / 10) + fstyle->size = (nsoption_int(font_min_size) * FONT_SIZE_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; +} |