Example #1
0
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);
}