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Diffstat (limited to 'framebuffer/fb_font.c')
-rw-r--r-- | framebuffer/fb_font.c | 134 |
1 files changed, 134 insertions, 0 deletions
diff --git a/framebuffer/fb_font.c b/framebuffer/fb_font.c new file mode 100644 index 000000000..0f416e865 --- /dev/null +++ b/framebuffer/fb_font.c @@ -0,0 +1,134 @@ +/* + * Copyright 2005 James Bursa <bursa@users.sourceforge.net> + * 2008 Vincent Sanders <vince@simtec.co.uk> + * + * 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 <inttypes.h> + +#include <assert.h> +#include "css/css.h" +#include "render/font.h" +#include "desktop/options.h" +#include "utils/utf8.h" + +#include "framebuffer/fb_gui.h" +#include "framebuffer/fb_font.h" + +const struct fb_font_desc* +fb_get_font(const struct css_style *style) +{ + return &font_vga_8x16; +} + +utf8_convert_ret utf8_to_font_encoding(const struct fb_font_desc* font, + const char *string, + size_t len, + char **result) +{ + return utf8_to_enc(string, font->encoding, len, result); + +} + +utf8_convert_ret utf8_to_local_encoding(const char *string, + size_t len, + char **result) +{ + return utf8_to_enc(string, "CP437", len, result); + +} + +static bool nsfont_width(const struct css_style *style, + const char *string, size_t length, + int *width) +{ + const struct fb_font_desc* fb_font = fb_get_font(style); + *width = fb_font->width * length; + return true; +} + +/** + * Find the position in a string where an x coordinate falls. + * + * \param style css_style for this text, with style->font_size.size == + * CSS_FONT_SIZE_LENGTH + * \param string UTF-8 string to measure + * \param length length of string + * \param x x coordinate to search for + * \param char_offset updated to offset in string of actual_x, [0..length] + * \param actual_x updated to x coordinate of character closest to x + * \return true on success, false on error and error reported + */ + +static bool nsfont_position_in_string(const struct css_style *style, + const char *string, size_t length, + int x, size_t *char_offset, int *actual_x) +{ + const struct fb_font_desc* fb_font = fb_get_font(style); + *char_offset = x / fb_font->width; + *actual_x = *char_offset * fb_font->width; + return true; +} + + +/** + * Find where to split a string to make it fit a width. + * + * \param style css_style for this text, with style->font_size.size == + * CSS_FONT_SIZE_LENGTH + * \param string UTF-8 string to measure + * \param length length of string + * \param x width available + * \param char_offset updated to offset in string of actual_x, [0..length] + * \param actual_x updated to x coordinate of character closest to x + * \return true on success, false on error and error reported + * + * On exit, [char_offset == 0 || + * string[char_offset] == ' ' || + * char_offset == length] + */ + +static bool nsfont_split(const struct css_style *style, + const char *string, size_t length, + int x, size_t *char_offset, int *actual_x) +{ + + const struct fb_font_desc* fb_font = fb_get_font(style); + *char_offset = x / fb_font->width; + if (*char_offset > length) { + *char_offset = length; + } else { + while (*char_offset > 0) { + if (string[*char_offset] == ' ') + break; + (*char_offset)--; + } + } + *actual_x = *char_offset * fb_font->width; + return true; +} + +const struct font_functions nsfont = { + nsfont_width, + nsfont_position_in_string, + nsfont_split +}; + +/* + * Local Variables: + * c-basic-offset:8 + * End: + */ |