GitLab

Detail:
  This locally replicates what ColourTrans 1.96 did, without the side effects
  which that caused. When stamping/tinting with a translucent shade of a sprite
  into a <= 256 colour target which has no palette, temporarily add one.
  As memory moving an entire sprite file is expensive, instead
  1. clone the sprite header on the stack
  2. append a palette
  3. fix up the pointers to point at the original sprite/mask data
  4. do the paint operation
  5. adjust the pointers back to the original (unpaletted) sprite header
  Also remove the test of ColourTrans 1.96 since this is no longer needed.