mirror of
https://github.com/netsurf-browser/netsurf
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108 lines
3.4 KiB
C
108 lines
3.4 KiB
C
/*
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* Copyright 2011 Daniel Silverstone <dsilvers@digital-scurf.org>
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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 "render/font.h"
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#include "utils/nsoption.h"
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#include "utils/utf8.h"
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static bool nsfont_width(const plot_font_style_t *fstyle,
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const char *string, size_t length,
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int *width)
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{
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*width = (fstyle->size * utf8_bounded_length(string, length)) / FONT_SIZE_SCALE;
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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 fstyle style for this text
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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 plot_font_style_t *fstyle,
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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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*char_offset = x / (fstyle->size / FONT_SIZE_SCALE);
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if (*char_offset > length)
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*char_offset = length;
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*actual_x = *char_offset * (fstyle->size / FONT_SIZE_SCALE);
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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 fstyle style for this text
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* \param string UTF-8 string to measure
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* \param length length of string, in bytes
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* \param x width available
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* \param char_offset updated to offset in string of actual_x, [1..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 indicates first character after split point.
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*
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* Note: char_offset of 0 should never be returned.
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*
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* Returns:
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* char_offset giving split point closest to x, where actual_x <= x
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* else
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* char_offset giving split point closest to x, where actual_x > x
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*
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* Returning char_offset == length means no split possible
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*/
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static bool nsfont_split(const plot_font_style_t *fstyle,
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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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int c_off = *char_offset = x / (fstyle->size / FONT_SIZE_SCALE);
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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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if (*char_offset == 0) {
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*char_offset = c_off;
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while (*char_offset < length && string[*char_offset] != ' ') {
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(*char_offset)++;
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}
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}
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}
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*actual_x = *char_offset * (fstyle->size / FONT_SIZE_SCALE);
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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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