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SCI: Fixed bug #3037945 - "PQ3 : Graphical Glitch with White Mercedes on Freeway"

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svn-id: r54975
This commit is contained in:
Filippos Karapetis 2010-12-20 12:21:18 +00:00
parent d3340b0d0c
commit 4b836d611f
1 changed files with 14 additions and 1 deletions
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15
engines/sci/graphics/paint16.cpp
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@ -534,7 +534,20 @@ reg_t GfxPaint16::kernelDisplay(const char *text, int argc, reg_t *argv) {
case SCI_DISPLAY_RESTOREUNDER:
bitsGetRect(argv[0], &rect);
rect.translate(-_ports->getPort()->left, -_ports->getPort()->top);
bitsRestore(argv[0]);
if (g_sci->getGameId() == GID_PQ3 && g_sci->getEngineState()->currentRoomNumber() == 29) {
// WORKAROUND: PQ3 calls this without calling the associated
// kDisplay(SCI_DISPLAY_SAVEUNDER) call before. Theoretically,
// this would result in no rect getting restored. However, we
// still maintain a pointer from the previous room, resulting
// in invalidated content being restored on screen, and causing
// graphics glitches. Thus, we simply don't restore a rect in
// that room. The correct fix for this would be to erase hunk
// pointers when changing rooms, but this will suffice for now,
// as restoring from a totally invalid pointer is very rare.
// Fixes bug #3037945.
} else {
bitsRestore(argv[0]);
}
kernelGraphRedrawBox(rect);
// finishing loop
argc = 0;