font_glyph_size
return font_glyph_size(font->width, font->height) * font->charcount;
memset(out, 0, font_glyph_size(width, height));
memset(out, 0, font_glyph_size(height, width)); /* flip width/height */
unsigned int s_cellsize = font_glyph_size(width, height);
d_cellsize = font_glyph_size(height, width); /* flip width/height */
memset(out, 0, font_glyph_size(height, width)); /* flip width/height */