mirror of
https://github.com/netsurf-browser/netsurf
synced 2024-11-28 17:23:09 +03:00
142 lines
4.1 KiB
C
142 lines
4.1 KiB
C
/*
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* Copyright 2005 James Bursa <bursa@users.sourceforge.net>
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* 2008 Vincent Sanders <vince@simtec.co.uk>
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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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#include <inttypes.h>
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#include <assert.h>
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#include "css/css.h"
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#include "render/font.h"
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#include "desktop/options.h"
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#include "utils/utf8.h"
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#include "framebuffer/gui.h"
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#include "framebuffer/font.h"
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bool fb_font_init(void)
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{
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return true;
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}
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const struct fb_font_desc*
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fb_get_font(const struct css_style *style)
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{
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return &font_vga_8x16;
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}
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utf8_convert_ret utf8_to_font_encoding(const struct fb_font_desc* font,
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const char *string,
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size_t len,
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char **result)
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{
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return utf8_to_enc(string, font->encoding, len, result);
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}
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utf8_convert_ret utf8_to_local_encoding(const char *string,
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size_t len,
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char **result)
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{
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return utf8_to_enc(string, "CP437", len, result);
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}
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static bool nsfont_width(const struct css_style *style,
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const char *string, size_t length,
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int *width)
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{
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const struct fb_font_desc* fb_font = fb_get_font(style);
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*width = fb_font->width * utf8_bounded_length(string, length);
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return true;
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}
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/**
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* Find the position in a string where an x coordinate falls.
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*
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* \param style css_style for this text, with style->font_size.size ==
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* CSS_FONT_SIZE_LENGTH
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* \param string UTF-8 string to measure
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* \param length length of string
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* \param x x coordinate to search for
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* \param char_offset updated to offset in string of actual_x, [0..length]
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* \param actual_x updated to x coordinate of character closest to x
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* \return true on success, false on error and error reported
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*/
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static bool nsfont_position_in_string(const struct css_style *style,
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const char *string, size_t length,
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int x, size_t *char_offset, int *actual_x)
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{
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const struct fb_font_desc* fb_font = fb_get_font(style);
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*char_offset = x / fb_font->width;
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if (*char_offset > length)
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*char_offset = length;
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*actual_x = *char_offset * fb_font->width;
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return true;
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}
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/**
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* Find where to split a string to make it fit a width.
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*
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* \param style css_style for this text, with style->font_size.size ==
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* CSS_FONT_SIZE_LENGTH
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* \param string UTF-8 string to measure
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* \param length length of string
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* \param x width available
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* \param char_offset updated to offset in string of actual_x, [0..length]
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* \param actual_x updated to x coordinate of character closest to x
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* \return true on success, false on error and error reported
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*
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* On exit, [char_offset == 0 ||
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* string[char_offset] == ' ' ||
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* char_offset == length]
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*/
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static bool nsfont_split(const struct css_style *style,
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const char *string, size_t length,
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int x, size_t *char_offset, int *actual_x)
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{
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const struct fb_font_desc* fb_font = fb_get_font(style);
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*char_offset = x / fb_font->width;
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if (*char_offset > length) {
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*char_offset = length;
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} else {
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while (*char_offset > 0) {
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if (string[*char_offset] == ' ')
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break;
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(*char_offset)--;
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}
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}
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*actual_x = *char_offset * fb_font->width;
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return true;
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}
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const struct font_functions nsfont = {
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nsfont_width,
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nsfont_position_in_string,
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nsfont_split
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};
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/*
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* Local Variables:
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* c-basic-offset:8
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* End:
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*/
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