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Store the surface properties in the reserved pointer of a surface

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This prevents us from exposing the properties publicly and allows us to repurpose the pointer later if necessary.

Fixes https://github.com/libsdl-org/SDL/issues/8758
This commit is contained in:
Sam Lantinga
2023-12-29 08:17:06 -08:00
parent b6a92c113f
commit d71454da17
2 changed files with 12 additions and 10 deletions
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6
include/SDL3/SDL_surface.h
View File

@@ -104,11 +104,7 @@ typedef struct SDL_Surface
int pitch; /**< Read-only */ int pitch; /**< Read-only */
void *pixels; /**< Read-write */ void *pixels; /**< Read-write */
/** Application data associated with the surface */ void *reserved; /**< Private */
union {
void *reserved; /**< For ABI compatibility only, do not use */
SDL_PropertiesID props; /**< Read-only */
};
/** information needed for surfaces requiring locks */ /** information needed for surfaces requiring locks */
int locked; /**< Read-only */ int locked; /**< Read-only */

16
src/video/SDL_surface.c
View File

@@ -252,23 +252,28 @@ SDL_Surface *SDL_CreateSurfaceFrom(void *pixels, int width, int height, int pitc
SDL_PropertiesID SDL_GetSurfaceProperties(SDL_Surface *surface) SDL_PropertiesID SDL_GetSurfaceProperties(SDL_Surface *surface)
{ {
SDL_PropertiesID props;
if (!surface) { if (!surface) {
SDL_InvalidParamError("surface"); SDL_InvalidParamError("surface");
return 0; return 0;
} }
if (!(surface->flags & SDL_SURFACE_USES_PROPERTIES)) { if (surface->flags & SDL_SURFACE_USES_PROPERTIES) {
props = (SDL_PropertiesID)(uintptr_t)surface->reserved;
} else {
if (surface->reserved != NULL) { if (surface->reserved != NULL) {
SDL_SetError("Surface has userdata, incompatible with properties"); SDL_SetError("Surface has userdata, incompatible with properties");
return 0; return 0;
} }
surface->props = SDL_CreateProperties(); props = SDL_CreateProperties();
if (surface->props) { if (props) {
surface->reserved = (void *)(uintptr_t)props;
surface->flags |= SDL_SURFACE_USES_PROPERTIES; surface->flags |= SDL_SURFACE_USES_PROPERTIES;
} }
} }
return surface->props; return props;
} }
int SDL_SetSurfacePalette(SDL_Surface *surface, SDL_Palette *palette) int SDL_SetSurfacePalette(SDL_Surface *surface, SDL_Palette *palette)
@@ -1570,7 +1575,8 @@ void SDL_DestroySurface(SDL_Surface *surface)
} }
if (surface->flags & SDL_SURFACE_USES_PROPERTIES) { if (surface->flags & SDL_SURFACE_USES_PROPERTIES) {
SDL_DestroyProperties(surface->props); SDL_PropertiesID props = (SDL_PropertiesID)(uintptr_t)surface->reserved;
SDL_DestroyProperties(props);
} }
SDL_InvalidateMap(surface->map); SDL_InvalidateMap(surface->map);