mirror of
https://github.com/netsurf-browser/netsurf
synced 2024-12-12 15:27:16 +03:00
17be8cf216
The netsurf core is driven from numerous operation tables most of which are now set through a common netsurf_register() interface. The font and plotting interfaces are currently separate and unlike all the other operation tables are modified for differing contexts. This change moves the font operations alongside all the other operations table and remove unnecessary interaction with the renderers font internals. Further this also removes the need for css internals to be visible in frontends.
107 lines
3.4 KiB
C
107 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 "utils/nsoption.h"
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#include "utils/utf8.h"
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#include "desktop/font.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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