GSOC: 16 bit game SDL surface
|Reported by:||SF/upthorn||Owned by:||sev-|
This adds a 16-bit surface to the SDL backend, for use by games... and modifies CopyRectToScreen et all to use it non-conditionally, to facilitate testing of the engine modules' support of 16-bit graphics. Do NOT incorporate this into trunk as it will break display of all games.
This patch was built against revision 40366
Ticket imported from: #2794727. Ticket imported from: patches/1124.