diff options
Diffstat (limited to 'monkey/font.c')
-rw-r--r-- | monkey/font.c | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/monkey/font.c b/monkey/font.c new file mode 100644 index 000000000..759c3e935 --- /dev/null +++ b/monkey/font.c @@ -0,0 +1,96 @@ +/* + * Copyright 2011 Daniel Silverstone <dsilvers@digital-scurf.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 "css/css.h" +#include "render/font.h" +#include "desktop/options.h" +#include "utils/utf8.h" + + +static bool nsfont_width(const plot_font_style_t *fstyle, + const char *string, size_t length, + int *width) +{ + *width = (fstyle->size * utf8_bounded_length(string, length)) / FONT_SIZE_SCALE; + return true; +} + +/** + * Find the position in a string where an x coordinate falls. + * + * \param fstyle style for this text + * \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 plot_font_style_t *fstyle, + const char *string, size_t length, + int x, size_t *char_offset, int *actual_x) +{ + *char_offset = x / (fstyle->size / FONT_SIZE_SCALE); + if (*char_offset > length) + *char_offset = length; + *actual_x = *char_offset * (fstyle->size / FONT_SIZE_SCALE); + return true; +} + + +/** + * Find where to split a string to make it fit a width. + * + * \param fstyle style for this text + * \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 plot_font_style_t *fstyle, + const char *string, size_t length, + int x, size_t *char_offset, int *actual_x) +{ + + *char_offset = x / (fstyle->size / FONT_SIZE_SCALE); + if (*char_offset > length) { + *char_offset = length; + } else { + while (*char_offset > 0) { + if (string[*char_offset] == ' ') + break; + (*char_offset)--; + } + } + *actual_x = *char_offset * (fstyle->size / FONT_SIZE_SCALE); + return true; +} + +const struct font_functions nsfont = { + nsfont_width, + nsfont_position_in_string, + nsfont_split +}; |