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- <title>"SDL_DisplayFormatAlpha"("3") manual page</title>
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- <a href='#toc'>Table of Contents</a><p>
-
- <h2><a name='sect0' href='#toc0'>Name</a></h2>
- SDL_DisplayFormatAlpha- Convert a surface to the display format
- <h2><a name='sect1' href='#toc1'>Synopsis</a></h2>
- <p>
- <b>#include
- "SDL.h" <p>
- </b><b>SDL_Surface *<b>SDL_DisplayFormatAlpha</b></b>(<b>SDL_Surface *surface</b>);
- <h2><a name='sect2' href='#toc2'>Description</a></h2>
- <p>
- This
- function takes a surface and copies it to a new surface of the pixel format
- and colors of the video framebuffer plus an alpha channel, suitable for
- fast blitting onto the display surface. It calls <i>SDL_ConvertSurface</i> <p>
- If you
- want to take advantage of hardware colorkey or alpha blit acceleration,
- you should set the colorkey and alpha value before calling this function.
- <p>
- This function can be used to convert a colourkey to an alpha channel, if
- the <b>SDL_SRCCOLORKEY</b> flag is set on the surface. The generated surface will
- then be transparent (alpha=0) where the pixels match the colourkey, and
- opaque (alpha=255) elsewhere.
- <h2><a name='sect3' href='#toc3'>Return Value</a></h2>
- <p>
- If the conversion fails or runs
- out of memory, it returns <b>NULL</b>
- <h2><a name='sect4' href='#toc4'>See Also</a></h2>
- <p>
- <i>SDL_ConvertSurface</i>, <i>SDL_SetAlpha</i>,
- <i>SDL_SetColorKey</i>, <i>SDL_DisplayFormat</i>, <i>SDL_Surface</i>
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- <a name='toc'><b>Table of Contents</b></a><p>
- <ul>
- <li><a name='toc0' href='#sect0'>Name</a></li>
- <li><a name='toc1' href='#sect1'>Synopsis</a></li>
- <li><a name='toc2' href='#sect2'>Description</a></li>
- <li><a name='toc3' href='#sect3'>Return Value</a></li>
- <li><a name='toc4' href='#sect4'>See Also</a></li>
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