Load an image from an SDL data source into a GPU texture.
int freesrc);SDL_Texture * IMG_LoadTexture_RW(SDL_Renderer *renderer, SDL_RWops *src,
|renderer||the SDL_Renderer to use to create the GPU texture.|
|src||an SDL_RWops that data will be read from.|
|freesrc||non-zero to close/free the SDL_RWops before returning, zero to leave it open.|
Returns a new texture, or NULL on error.
An SDL_Texture represents an image in GPU memory, usable by SDL's 2D Render API. This can be significantly more efficient than using a CPU-bound SDL_Surface if you don't need to manipulate the image directly after loading it.
If the loaded image has transparency or a colorkey, a texture with an alpha channel will be created. Otherwise, SDL_image will attempt to create an SDL_Texture in the most format that most reasonably represents the image data (but in many cases, this will just end up being 32-bit RGB or 32-bit RGBA).
freesrc is non-zero, the RWops will be closed before returning, whether this function succeeds or not. SDL_image reads everything it needs from the RWops during this call in any case.
There is a separate function to read files from disk without having to deal with SDL_RWops:
IMG_LoadTexture(renderer, "filename.jpg") will call this function and manage those details for you, determining the file type from the filename's extension.
There is also IMG_LoadTextureTyped_RW(), which is equivalent to this function except a file extension (like "BMP", "JPG", etc) can be specified, in case SDL_image cannot autodetect the file format.
If you would rather decode an image to an SDL_Surface (a buffer of pixels in CPU memory), call IMG_Load() instead.
When done with the returned texture, the app should dispose of it with a call to SDL_DestroyTexture().
This function is available since SDL_image 2.0.0.