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SDL Wiki


Read pixels from the current rendering target to an array of pixels.


int SDL_RenderReadPixels(SDL_Renderer * renderer,
                         const SDL_Rect * rect,
                         Uint32 format,
                         void *pixels, int pitch);

Function Parameters


the rendering context


an SDL_Rect structure representing the area to read, or NULL for the entire render target


an SDL_PixelFormatEnum value of the desired format of the pixel data, or 0 to use the format of the rendering target


a pointer to the pixel data to copy into


the pitch of the pixels parameter

Return Value

Returns 0 on success or a negative error code on failure; call SDL_GetError() for more information.


WARNING: This is a very slow operation, and should not be used frequently.

pitch specifies the number of bytes between rows in the destination pixels data. This allows you to write to a subrectangle or have padded rows in the destination. Generally, pitch should equal the number of pixels per row in the pixels data times the number of bytes per pixel, but it might contain additional padding (for example, 24bit RGB Windows Bitmap data pads all rows to multiples of 4 bytes).

CategoryAPI, CategoryRender

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