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Currently, all SDL_Surfaces with an indexed pixel format have an associated SDL_Palette. This palette either consists of entirely the colour black, or -- in the special case of 1-bit surfaces, black and white. When an indexed surface is blitted to another indexed surface, a 'map' is generated from the source surface's palette to the destination surfaces palette, in order to preserve the look of the image if the palettes differ. However, in most cases, applications will want to blit the raw index values, rather than translate to make the colours as similar as possible. For instance, the destination surface's palette may have been modified to fade the screen out. This change allows an indexed surface to have no associated palette. If either the source or destination surface of a blit do not have a palette, then the raw indices are copied (assuming both have an indexed format). This mimics better what happens with most other APIs (such as DirectDraw), where most users do not set a palette on any surface but the screen, whose palette is implicitly used for the whole application.
Simple DirectMedia Layer
Simple DirectMedia Layer is a cross-platform development library designed to provide low level access to audio, keyboard, mouse, joystick, and graphics hardware. It is used by video playback software, emulators, and popular games including Valve's award winning catalog and many Humble Bundle games.
SDL officially supports Windows, macOS, Linux, iOS, and Android. Support for other platforms may be found in the source code.
SDL is written in C, works natively with C++, and there are bindings available for several other languages, including C# and Python.
This library is distributed under the zlib license, which can be found in the file "LICENSE.txt".
Information on building SDL with CMake is available in README-cmake.md
The best way to learn how to use SDL is to check out the header files in the "include" subdirectory and the programs in the "test" subdirectory. The header files and test programs are well commented and always up to date.
Information on reporting bugs and contributing is available in README-contributing.md
More documentation and FAQs are available online at the wiki
If you need help with the library, or just want to discuss SDL related issues, you can join the SDL Discourse, which can be used as a web forum or a mailing list, at your preference.
If you want to report bugs or contribute patches, please submit them to our bug tracker
Enjoy!
Sam Lantinga mailto:slouken@libsdl.org