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author | Max Horn | 2004-03-01 11:20:32 +0000 |
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committer | Max Horn | 2004-03-01 11:20:32 +0000 |
commit | 0603c3a11fc377f6b20b766e046d7b1373b12319 (patch) | |
tree | 1c94c59862170b68aed1e51e1b0b5b53186fad46 /backends/sdl/graphics.cpp | |
parent | 09198784082b797f4e0b862c0f86e2ab4f1fb63d (diff) | |
download | scummvm-rg350-0603c3a11fc377f6b20b766e046d7b1373b12319.tar.gz scummvm-rg350-0603c3a11fc377f6b20b766e046d7b1373b12319.tar.bz2 scummvm-rg350-0603c3a11fc377f6b20b766e046d7b1373b12319.zip |
Fix for bug #907280: Mouse glitches and crashes (Regression)
svn-id: r13123
Diffstat (limited to 'backends/sdl/graphics.cpp')
-rw-r--r-- | backends/sdl/graphics.cpp | 30 |
1 files changed, 25 insertions, 5 deletions
diff --git a/backends/sdl/graphics.cpp b/backends/sdl/graphics.cpp index 1d975b2b92..307caa724a 100644 --- a/backends/sdl/graphics.cpp +++ b/backends/sdl/graphics.cpp @@ -1074,12 +1074,32 @@ void OSystem_SDL::undraw_mouse() { if (SDL_LockSurface(_overlayVisible ? _tmpscreen : _screen) == -1) error("SDL_LockSurface failed: %s", SDL_GetError()); - const int old_mouse_x = _mouseCurState.x; - const int old_mouse_y = _mouseCurState.y; - const int old_mouse_w = _mouseCurState.w; - const int old_mouse_h = _mouseCurState.h; - int x, y; + int old_mouse_x = _mouseCurState.x - _mouseHotspotX; + int old_mouse_y = _mouseCurState.y - _mouseHotspotY; + int old_mouse_w = _mouseCurState.w; + int old_mouse_h = _mouseCurState.h; + + // clip the mouse rect, and addjust the src pointer accordingly + if (old_mouse_x < 0) { + old_mouse_w += old_mouse_x; + old_mouse_x = 0; + } + if (old_mouse_y < 0) { + old_mouse_h += old_mouse_y; + old_mouse_y = 0; + } + + if (old_mouse_w > _screenWidth - old_mouse_x) + old_mouse_w = _screenWidth - old_mouse_x; + if (old_mouse_h > _screenHeight - old_mouse_y) + old_mouse_h = _screenHeight - old_mouse_y; + // Quick check to see if anything has to be drawn at all + if (old_mouse_w <= 0 || old_mouse_h <= 0) + return; + + + int x, y; if (!_overlayVisible) { byte *dst, *bak = _mouseBackup; |