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Added a helper function SDL_LockTextureToSurface()

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Similar to SDL_LockTexture(), except the locked area is exposed as a SDL surface.
This commit is contained in:
Sylvain Becker 2019-09-30 20:58:44 +02:00
parent f46ac1e9f7
commit 1ae61f1009
6 changed files with 77 additions and 0 deletions
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21
include/SDL_render.h
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@ -430,10 +430,31 @@ extern DECLSPEC int SDLCALL SDL_LockTexture(SDL_Texture * texture,
const SDL_Rect * rect,
void **pixels, int *pitch);
/**
* \brief Lock a portion of the texture for write-only pixel access.
* Expose it as a SDL surface.
*
* \param texture The texture to lock for access, which was created with
* ::SDL_TEXTUREACCESS_STREAMING.
* \param rect A pointer to the rectangle to lock for access. If the rect
* is NULL, the entire texture will be locked.
* \param surface This is filled in with a SDL surface representing the locked area
* Surface is freed internally after calling SDL_UnlockTexture or SDL_DestroyTexture.
*
* \return 0 on success, or -1 if the texture is not valid or was not created with ::SDL_TEXTUREACCESS_STREAMING.
*
* \sa SDL_UnlockTexture()
*/
extern DECLSPEC int SDLCALL SDL_LockTextureToSurface(SDL_Texture *texture,
const SDL_Rect *rect,
SDL_Surface **surface);
/**
* \brief Unlock a texture, uploading the changes to video memory, if needed.
* If SDL_LockTextureToSurface() was called for locking, the SDL surface is freed.
*
* \sa SDL_LockTexture()
* \sa SDL_LockTextureToSurface()
*/
extern DECLSPEC void SDLCALL SDL_UnlockTexture(SDL_Texture * texture);