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- This example creates an SDL window and renderer, and draws a
- rotating texture to it, reads back the rendered pixels, converts them to
- black and white, and then draws the converted image to a corner of the
- screen.
- This isn't necessarily an efficient thing to do--in real life one might
- want to do this sort of thing with a render target--but it's just a visual
- example of how to use SDL_RenderReadPixels().
- A better, but less visual, use of SDL_RenderReadPixels() is to make
- screenshots: you grab the current contents of the screen, and save the pixels
- as a bitmap file or whatever.
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