GitLab

Fix plotting of RISC OS 5 type sprites and masks. Fix hang when attempting to report "alpha mask not supported" error. Fix reading/writing of alpha mask pixels.

Detail:
  s/vdu/vdugrafg - Fixed PutSprite and PlotMask to correctly deal with RISC OS 5 type sprite mode words. Fix infinite loops in PutSpriWideMaskErr casued by R14 getting trashed.
  s/vdu/vdugrafh - Fixed SpriteMaskAddr malfunctioning when trying to calculate addresses in alpha masks. Minor ReadPixelMask & WritePixelMask optimisations.
  s/vdu/vduswis - Fixed OS_ScreenMode 13 & 14 to count "G2" as a valid colour specifier.
Admin:
  Tested on BB-xM
  Should hopefully fix the random hangs reported on the forums when trying to use sprites with alpha masks


Version 5.35, 4.79.2.197. Tagged as 'Kernel-5_35-4_79_2_197'