128 lines
3.9 KiB
C
128 lines
3.9 KiB
C
/*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program 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, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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/** \file
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* \ingroup blf
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*
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* Utility function to generate font preview images.
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*
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* Isolate since this needs to be called by #ImBuf code (bad level call).
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <ft2build.h>
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#include FT_FREETYPE_H
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#include "BLI_listbase.h"
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#include "BLI_rect.h"
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#include "BLI_threads.h"
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#include "BLI_utildefines.h"
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#include "blf_internal.h"
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#include "blf_internal_types.h"
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#include "BLF_api.h"
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#include "BLT_translation.h"
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#include "BLI_strict_flags.h"
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/**
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* This function is used for generating thumbnail previews.
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*
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* \note called from a thread, so it bypasses the normal BLF_* api (which isn't thread-safe).
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*/
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void BLF_thumb_preview(const char *filename,
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const char **draw_str,
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const char **i18n_draw_str,
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const unsigned char draw_str_lines,
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const float font_color[4],
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const int font_size,
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unsigned char *buf,
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int w,
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int h,
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int channels)
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{
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const unsigned int dpi = 72;
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const int font_size_min = 6;
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int font_size_curr;
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/* shrink 1/th each line */
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int font_shrink = 4;
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FontBLF *font;
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int i;
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/* Create a new blender font obj and fill it with default values */
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font = blf_font_new("thumb_font", filename);
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if (!font) {
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printf("Info: Can't load font '%s', no preview possible\n", filename);
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return;
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}
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/* Would be done via the BLF API, but we're not using a fontid here */
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font->buf_info.cbuf = buf;
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font->buf_info.ch = channels;
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font->buf_info.w = w;
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font->buf_info.h = h;
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/* Always create the image with a white font,
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* the caller can theme how it likes */
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memcpy(font->buf_info.col_init, font_color, sizeof(font->buf_info.col_init));
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font->pos[1] = (float)h;
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font_size_curr = font_size;
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blf_draw_buffer__start(font);
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for (i = 0; i < draw_str_lines; i++) {
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const char *draw_str_i18n = i18n_draw_str[i] != NULL ? i18n_draw_str[i] : draw_str[i];
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const size_t draw_str_i18n_len = strlen(draw_str_i18n);
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int draw_str_i18n_nbr = 0;
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blf_font_size(font, (unsigned int)MAX2(font_size_min, font_size_curr), dpi);
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/* font->glyph_cache remains NULL if blf_font_size() failed to set font size */
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if (!font->glyph_cache) {
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break;
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}
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/* decrease font size each time */
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font_size_curr -= (font_size_curr / font_shrink);
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font_shrink += 1;
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font->pos[1] -= font->glyph_cache->ascender * 1.1f;
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/* We fallback to default english strings in case not enough chars are available in current
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* font for given translated string (useful in non-latin i18n context, like Chinese,
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* since many fonts will then show nothing but ugly 'missing char' in their preview).
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* Does not handle all cases, but much better than nothing.
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*/
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if (blf_font_count_missing_chars(font, draw_str_i18n, draw_str_i18n_len, &draw_str_i18n_nbr) >
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(draw_str_i18n_nbr / 2)) {
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blf_font_draw_buffer(font, draw_str[i], strlen(draw_str[i]), NULL);
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}
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else {
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blf_font_draw_buffer(font, draw_str_i18n, draw_str_i18n_len, NULL);
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}
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}
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blf_draw_buffer__end();
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blf_font_free(font);
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}
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