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+<HTML
+><HEAD
+><TITLE
+>SDL_DisplayFormatAlpha</TITLE
+><META
+NAME="GENERATOR"
+CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+
+"><LINK
+REL="HOME"
+TITLE="SDL Library Documentation"
+HREF="index.html"><LINK
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+TITLE="Video"
+HREF="video.html"><LINK
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+TITLE="SDL_DisplayFormat"
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+>SDL Library Documentation</TH
+></TR
+><TR
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+><A
+HREF="sdldisplayformat.html"
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+>Prev</A
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+>Next</A
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+><HR
+ALIGN="LEFT"
+WIDTH="100%"></DIV
+><H1
+><A
+NAME="SDLDISPLAYFORMATALPHA"
+></A
+>SDL_DisplayFormatAlpha</H1
+><DIV
+CLASS="REFNAMEDIV"
+><A
+NAME="AEN2432"
+></A
+><H2
+>Name</H2
+>SDL_DisplayFormatAlpha&nbsp;--&nbsp;Convert a surface to the display format</DIV
+><DIV
+CLASS="REFSYNOPSISDIV"
+><A
+NAME="AEN2435"
+></A
+><H2
+>Synopsis</H2
+><DIV
+CLASS="FUNCSYNOPSIS"
+><A
+NAME="AEN2436"
+></A
+><P
+></P
+><PRE
+CLASS="FUNCSYNOPSISINFO"
+>#include "SDL.h"</PRE
+><P
+><CODE
+><CODE
+CLASS="FUNCDEF"
+>SDL_Surface *<B
+CLASS="FSFUNC"
+>SDL_DisplayFormatAlpha</B
+></CODE
+>(SDL_Surface *surface);</CODE
+></P
+><P
+></P
+></DIV
+></DIV
+><DIV
+CLASS="REFSECT1"
+><A
+NAME="AEN2442"
+></A
+><H2
+>Description</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
+<A
+HREF="sdlconvertsurface.html"
+>SDL_ConvertSurface</A
+></P
+><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
+><P
+>This function can be used to convert a colourkey to an alpha channel,
+if the <TT
+CLASS="LITERAL"
+>SDL_SRCCOLORKEY</TT
+> 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.</P
+></DIV
+><DIV
+CLASS="REFSECT1"
+><A
+NAME="AEN2449"
+></A
+><H2
+>Return Value</H2
+><P
+>If the conversion fails or runs out of memory, it returns
+<SPAN
+CLASS="RETURNVALUE"
+>NULL</SPAN
+></P
+></DIV
+><DIV
+CLASS="REFSECT1"
+><A
+NAME="AEN2453"
+></A
+><H2
+>See Also</H2
+><P
+><A
+HREF="sdlconvertsurface.html"
+>SDL_ConvertSurface</A
+>,
+<A
+HREF="sdlsetalpha.html"
+>SDL_SetAlpha</A
+>,
+<A
+HREF="sdlsetcolorkey.html"
+>SDL_SetColorKey</A
+>,
+<A
+HREF="sdldisplayformat.html"
+>SDL_DisplayFormat</A
+>,
+<A
+HREF="sdlsurface.html"
+>SDL_Surface</A
+></P
+></DIV
+><DIV
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+ACCESSKEY="P"
+>Prev</A
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+>Home</A
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+>Up</A
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+>
+\ No newline at end of file