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Don't crash if the stretch routines are used on hardware surfaces

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This commit is contained in:
Sam Lantinga
2004-05-16 21:08:55 +00:00
parent 8cd47b4750
commit a6590f591a
1 changed files with 32 additions and 0 deletions
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32
src/video/SDL_stretch.c
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@@ -181,6 +181,8 @@ void copy_row3(Uint8 *src, int src_w, Uint8 *dst, int dst_w)
int SDL_SoftStretch(SDL_Surface *src, SDL_Rect *srcrect,
SDL_Surface *dst, SDL_Rect *dstrect)
{
int src_locked;
int dst_locked;
int pos, inc;
int dst_width;
int dst_maxrow;
@@ -229,6 +231,28 @@ int SDL_SoftStretch(SDL_Surface *src, SDL_Rect *srcrect,
dstrect = &full_dst;
}
/* Lock the destination if it's in hardware */
dst_locked = 0;
if ( SDL_MUSTLOCK(dst) ) {
if ( SDL_LockSurface(dst) < 0 ) {
SDL_SetError("Unable to lock destination surface");
return(-1);
}
dst_locked = 1;
}
/* Lock the source if it's in hardware */
src_locked = 0;
if ( SDL_MUSTLOCK(src) ) {
if ( SDL_LockSurface(src) < 0 ) {
if ( dst_locked ) {
SDL_UnlockSurface(dst);
}
SDL_SetError("Unable to lock source surface");
return(-1);
}
src_locked = 1;
}
/* Set up the data... */
pos = 0x10000;
inc = (srcrect->h << 16) / dstrect->h;
@@ -307,6 +331,14 @@ int SDL_SoftStretch(SDL_Surface *src, SDL_Rect *srcrect,
#endif
pos += inc;
}
/* We need to unlock the surfaces if they're locked */
if ( dst_locked ) {
SDL_UnlockSurface(dst);
}
if ( src_locked ) {
SDL_UnlockSurface(src);
}
return(0);
}