mj2_video_source::get_graphics_mode

Identifies the raster operations which should be used to combine this track with others on the display. Tracks are added in the compositing order indicated by get_compositing_order.

One of the following values:

• 0x0000 → copy
• 0x0024 → blue screen the image using the supplied op-colour
• 0x0100 → alpha blend with existing contents
• 0x0101 → alpha blend, where compressed data has already been blended with white.
• 0x0102 → alpha blend, where compressed data has already been blended with black.

op_red [kdu_int16 &]

op_green [kdu_int16 &]

op_blue [kdu_int16 &]