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Fixed bug 2441 - SDL_DuplicateSurface

Rainer Deyke

I've written a small patch that adds a small SDL_DuplicateSurface function to SDL.  I've written the function as part of a larger (as yet unfinished) patch, but I think this function is useful enough that it merits inclusion in SDL on its own.
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slouken committed Aug 14, 2017
1 parent 362d549 commit f142a7961e42d76bfde09ca20ee3b4e67366e9d6
Showing with 25 additions and 0 deletions.
  1. +5 −0 include/SDL_surface.h
  2. +1 −0 src/dynapi/SDL_dynapi_overrides.h
  3. +1 −0 src/dynapi/SDL_dynapi_procs.h
  4. +18 −0 src/video/SDL_surface.c
@@ -359,6 +359,11 @@ extern DECLSPEC SDL_bool SDLCALL SDL_SetClipRect(SDL_Surface * surface,
extern DECLSPEC void SDLCALL SDL_GetClipRect(SDL_Surface * surface,
SDL_Rect * rect);

/*
* Creates a new surface identical to the existing surface
*/
extern DECLSPEC SDL_Surface *SDLCALL SDL_DuplicateSurface(SDL_Surface * surface);

/**
* Creates a new surface of the specified format, and then copies and maps
* the given surface to it so the blit of the converted surface will be as
@@ -628,3 +628,4 @@
#define SDL_LoadFile_RW SDL_LoadFile_RW_REAL
#define SDL_wcscmp SDL_wcscmp_REAL
#define SDL_ComposeCustomBlendMode SDL_ComposeCustomBlendMode_REAL
#define SDL_DuplicateSurface SDL_DuplicateSurface_REAL
@@ -660,3 +660,4 @@ SDL_DYNAPI_PROC(size_t,SDL_utf8strlen,(const char *a),(a),return)
SDL_DYNAPI_PROC(void*,SDL_LoadFile_RW,(SDL_RWops *a, size_t *b, int c),(a,b,c),return)
SDL_DYNAPI_PROC(int,SDL_wcscmp,(const wchar_t *a, const wchar_t *b),(a,b),return)
SDL_DYNAPI_PROC(SDL_BlendMode,SDL_ComposeCustomBlendMode,(SDL_BlendFactor a, SDL_BlendFactor b, SDL_BlendOperation c, SDL_BlendFactor d, SDL_BlendFactor e, SDL_BlendOperation f),(a,b,c,d,e,f),return)
SDL_DYNAPI_PROC(SDL_Surface*,SDL_DuplicateSurface,(SDL_Surface *a),(a),return)
@@ -870,6 +870,15 @@ SDL_UnlockSurface(SDL_Surface * surface)
}
}

/*
* Creates a new surface identical to the existing surface
*/
SDL_Surface *
SDL_DuplicateSurface(SDL_Surface * surface)
{
return SDL_ConvertSurface(surface, surface->format, surface->flags);
}

/*
* Convert a surface into the specified pixel format.
*/
@@ -882,6 +891,15 @@ SDL_ConvertSurface(SDL_Surface * surface, const SDL_PixelFormat * format,
SDL_Color copy_color;
SDL_Rect bounds;

if (!surface) {
SDL_InvalidParamError("surface");
return NULL;
}
if (!format) {
SDL_InvalidParamError("format");
return NULL;
}

/* Check for empty destination palette! (results in empty image) */
if (format->palette != NULL) {
int i;

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