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