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/* SPDX-License-Identifier: GPL-2.0-or-later */
/** \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"
void BLF_thumb_preview(const char *filepath,
const char **draw_str,
const char **i18n_draw_str,
const uchar draw_str_lines,
const float font_color[4],
const int font_size,
uchar *buf,
const int w,
const int h,
const int channels)
{
const uint dpi = 72;
const int font_size_min = 6;
int font_size_curr;
/* shrink 1/th each line */
int font_shrink = 4;
/* While viewing thumbnails in font directories this function can be called simultaneously from a
* greater number of threads than we want the FreeType cache to keep open at a time. Therefore
* pass own FT_Library to font creation so that it is not managed by the FreeType cache system.
*/
FT_Library ft_library = NULL;
if (FT_Init_FreeType(&ft_library) != FT_Err_Ok) {
return;
}
FontBLF *font = blf_font_new_ex("thumb_font", filepath, NULL, 0, ft_library);
if (!font) {
printf("Info: Can't load font '%s', no preview possible\n", filepath);
FT_Done_FreeType(ft_library);
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.dims[0] = w;
font->buf_info.dims[1] = 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] = h;
font_size_curr = font_size;
blf_draw_buffer__start(font);
for (int 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_i18_count = 0;
CLAMP_MIN(font_size_curr, font_size_min);
if (!blf_font_size(font, (float)font_size_curr, dpi)) {
break;
}
/* decrease font size each time */
font_size_curr -= (font_size_curr / font_shrink);
font_shrink += 1;
font->pos[1] -= (int)((float)blf_font_ascender(font) * 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_i18_count) >
(draw_str_i18_count / 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);
FT_Done_FreeType(ft_library);
}
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