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If a size change occurs, the sdl2-compat event handler will flush the renderer, which will cause the software renderer to re-acquire a surface that was invalidated due to the size change. However, if the OnWindowPixelSizeChanged handler is called afterward, the invalid flag will be set on the surface, causing presentation to fail. Check both for a null surface pointer and an invalid surface flag when checking surface validity in the software renderer.
Simple DirectMedia Layer (SDL for short) is a cross-platform library designed to make it easy to write multi-media software, such as games and emulators.
You can find the latest release and additional information at: https://www.libsdl.org/
Installation instructions and a quick introduction is available in INSTALL.md
This library is distributed under the terms of the zlib license, available in LICENSE.txt.
Enjoy!
Sam Lantinga (slouken@libsdl.org)