- pixel-format->int pixel-formatprocedure
pixel-format may be one of the following symbols:
- any
- any-no-alpha
- any-with-alpha
- any-15-no-alpha
- any-16-no-alpha
- any-16-with-alpha
- any-24-no-alpha
- any-32-no-alpha
- any-32-with-alpha
- argb-8888
- rgba-8888
- argb-4444
- rgb-888
- rgb-565
- rgb555
- rgba-5551
- argb-1555
- abgr-8888
- xbgr-8888
- bgr-888
- bgr-565
- bgr-555
- rgbx-8888
- xrgb-8888
- abgr-f32
- abgr-8888-le
- rgba-4444