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Store the surface properties in the reserved pointer of a surface 

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
main
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 */
void *pixels; /**< Read-write */
/** Application data associated with the surface */
union {
void *reserved; /**< For ABI compatibility only, do not use */
SDL_PropertiesID props; /**< Read-only */
};
void *reserved; /**< Private */
/** information needed for surfaces requiring locks */
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 props;
if (!surface) {
SDL_InvalidParamError("surface");
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) {
SDL_SetError("Surface has userdata, incompatible with properties");
return 0;
}
surface->props = SDL_CreateProperties();
if (surface->props) {
props = SDL_CreateProperties();
if (props) {
surface->reserved = (void *)(uintptr_t)props;
surface->flags |= SDL_SURFACE_USES_PROPERTIES;
}
}
return surface->props;
return props;
}
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) {
SDL_DestroyProperties(surface->props);
SDL_PropertiesID props = (SDL_PropertiesID)(uintptr_t)surface->reserved;
SDL_DestroyProperties(props);
}
SDL_InvalidateMap(surface->map);