Poor perfomance when drawing text

[dlech]

Glyphs are not cached but rather loaded from disk each time a character is rendered, leading to poor performance.

grx/src/text/drawtext.c

Lines 91 to 117 in 09177aa

	for (; (c = g_utf8_get_char(text)) != '\0'; text = g_utf8_next_char(text)) {
	index = FT_Get_Char_Index(options->font->face, c);
	ret = FT_Load_Glyph(options->font->face, index, FT_LOAD_DEFAULT);
	if (ret) {
	continue;
	}
	// ret = FT_Render_Glyph(slot, FT_RENDER_MODE_NORMAL);
	// if (ret) {
	// continue;
	// }
	if (slot->format != FT_GLYPH_FORMAT_BITMAP) {
	continue;
	}
	if (slot->bitmap.pixel_mode != FT_PIXEL_MODE_MONO) {
	continue;
	}
	mem.plane0 = slot->bitmap.buffer;
	grx_context_new_full(GRX_FRAME_MODE_RAM_1BPP, slot->bitmap.pitch * 8,
	slot->bitmap.rows, &mem, &ctx);
	grx_bit_blt_1bpp(x + slot->bitmap_left - x_offset,
	y - slot->bitmap_top + y_offset, &ctx, 0, 0,
	slot->bitmap.width, slot->bitmap.rows,
	options->fg_color, options->bg_color);
	x += slot->advance.x >> 6;
	y += slot->advance.y >> 6;
	}
	}

https://freetype.org/freetype2/docs/reference/ft2-cache_subsystem.html