loadTextureIo method
Load an image from an SDL data source into a GPU texture.
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).
If closeio is true, src will be closed before returning, whether this
function succeeds or not. SDL_image reads everything it needs from src
during this call in any case.
There is a separate function to read files from disk without having to deal
with SDL_IOStream: 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_IO(), 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().
\param renderer the SDL_Renderer to use to create the GPU texture. \param src an SDL_IOStream that data will be read from. \param closeio true to close/free the SDL_IOStream before returning, false to leave it open. \returns a new texture, or NULL on error.
\since This function is available since SDL_image 3.0.0.
\sa IMG_LoadTexture \sa IMG_LoadTextureTyped_IO \sa SDL_DestroyTexture
extern SDL_DECLSPEC SDL_Texture * SDLCALL IMG_LoadTexture_IO(SDL_Renderer *renderer, SDL_IOStream *src, bool closeio)
Implementation
Pointer<SdlTexture> loadTextureIo(Pointer<SdlIoStream> src, bool freesrc) {
return imgLoadTextureIo(this, src, freesrc);
}