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SDL Wiki

SDL_LockTextureToSurface

Lock a portion of the texture for write-only pixel access, and expose it as a SDL surface.

Syntax

int SDL_LockTextureToSurface(SDL_Texture *texture,
                    const SDL_Rect *rect,
                    SDL_Surface **surface);

Function Parameters

texture

the texture to lock for access, which was created with SDL_TEXTUREACCESS_STREAMING

rect

a pointer to the rectangle to lock for access. If the rect is NULL, the entire texture will be locked

surface

this is filled in with an SDL surface representing the locked area

Return Value

Returns 0 on success, or -1 if the texture is not valid or was not created with SDL_TEXTUREACCESS_STREAMING

Remarks

Besides providing an SDL_Surface instead of raw pixel data, this function operates like SDL_LockTexture.

As an optimization, the pixels made available for editing don't necessarily contain the old texture data. This is a write-only operation, and if you need to keep a copy of the texture data you should do that at the application level.

You must use SDL_UnlockTexture() to unlock the pixels and apply any changes.

The returned surface is freed internally after calling SDL_UnlockTexture() or SDL_DestroyTexture(). The caller should not free it.

SDL_LockTexture()
SDL_UnlockTexture()

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