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Make sure the blit mapping is cleared when undoing RLE encoding

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This fixes a crash if a surface is RLE encoded, then locked and unlocked.

We also mark the surface as no longer needing to be locked after undoing RLE encoding
This commit is contained in:
Sam Lantinga
2025-11-08 15:24:49 -08:00
parent 089dc86bcf
commit 704ac98d3f
2 changed files with 8 additions and 2 deletions
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3
src/video/SDL_RLEaccel.c
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@@ -89,6 +89,7 @@
#include "SDL_sysvideo.h"
#include "SDL_surface_c.h"
#include "SDL_pixels_c.h"
#include "SDL_RLEaccel_c.h"
#define PIXEL_COPY(to, from, len, bpp) \
@@ -1385,6 +1386,8 @@ void SDL_UnRLESurface(SDL_Surface *surface)
SDL_free(surface->map.data);
surface->map.data = NULL;
SDL_InvalidateMap(&surface->map);
SDL_UpdateSurfaceLockFlag(surface);
}
}

7
src/video/SDL_surface.c
View File

@@ -50,7 +50,9 @@ bool SDL_SurfaceValid(SDL_Surface *surface)
void SDL_UpdateSurfaceLockFlag(SDL_Surface *surface)
{
if (surface->internal_flags & SDL_INTERNAL_SURFACE_RLEACCEL) {
// We need to mark the surface as needing unlock while locked
if ((surface->flags & SDL_SURFACE_LOCKED) ||
(surface->internal_flags & SDL_INTERNAL_SURFACE_RLEACCEL)) {
surface->flags |= SDL_SURFACE_LOCK_NEEDED;
} else {
surface->flags &= ~SDL_SURFACE_LOCK_NEEDED;
@@ -1726,7 +1728,6 @@ bool SDL_LockSurface(SDL_Surface *surface)
// Perform the lock
if (surface->internal_flags & SDL_INTERNAL_SURFACE_RLEACCEL) {
SDL_UnRLESurface(surface);
surface->flags |= SDL_SURFACE_LOCK_NEEDED;
}
#endif
}
@@ -1734,6 +1735,7 @@ bool SDL_LockSurface(SDL_Surface *surface)
// Increment the surface lock count, for recursive locks
++surface->locked;
surface->flags |= SDL_SURFACE_LOCKED;
SDL_UpdateSurfaceLockFlag(surface);
// Ready to go..
return true;
@@ -1754,6 +1756,7 @@ void SDL_UnlockSurface(SDL_Surface *surface)
}
surface->flags &= ~SDL_SURFACE_LOCKED;
SDL_UpdateSurfaceLockFlag(surface);
}
static bool SDL_FlipSurfaceHorizontal(SDL_Surface *surface)