void BLF_draw_buffer_ex(
int fontid, const char *str, size_t len,
struct ResultBLF *r_info)
{
FontBLF *font = blf_get(fontid);
if (font && font->glyph_cache && (font->buf_info.fbuf || font->buf_info.cbuf)) {
blf_draw_buffer__start(font);
if (font->flags & BLF_WORD_WRAP) {
blf_font_draw_buffer__wrap(font, str, len, r_info);
}
else {
blf_font_draw_buffer(font, str, len, r_info);
}
blf_draw_buffer__end();
}
}
/**
* 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 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 = BLT_translate_do(BLT_I18NCONTEXT_DEFAULT, 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);
/* 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);
}