docs/html/sdlsetalpha.html - third_party/sdl - Git at Google

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 ><H1
 ><A
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 ></A
 >SDL_SetAlpha</H1
 ><DIV
 CLASS="REFNAMEDIV"
 ><A
 NAME="AEN2096"
 ></A
 ><H2
 >Name</H2
 >SDL_SetAlpha&nbsp;--&nbsp;Adjust the alpha properties of a surface</DIV
 ><DIV
 CLASS="REFSYNOPSISDIV"
 ><A
 NAME="AEN2099"
 ></A
 ><H2
 >Synopsis</H2
 ><DIV
 CLASS="FUNCSYNOPSIS"
 ><A
 NAME="AEN2100"
 ></A
 ><P
 ></P
 ><PRE
 CLASS="FUNCSYNOPSISINFO"
 >#include "SDL.h"</PRE
 ><P
 ><CODE
 ><CODE
 CLASS="FUNCDEF"
 >int <B
 CLASS="FSFUNC"
 >SDL_SetAlpha</B
 ></CODE
 >(SDL_Surface *surface, Uint32 flag, Uint8 alpha);</CODE
 ></P
 ><P
 ></P
 ></DIV
 ></DIV
 ><DIV
 CLASS="REFSECT1"
 ><A
 NAME="AEN2106"
 ></A
 ><H2
 >Description</H2
 ><DIV
 CLASS="NOTE"
 ><BLOCKQUOTE
 CLASS="NOTE"
 ><P
 ><B
 >Note: </B
 >This function and the semantics of SDL alpha blending have changed since version 1.1.4. Up until version 1.1.5, an alpha value of 0 was considered opaque and a value of 255 was considered transparent. This has now been inverted: 0 (<TT
 CLASS="LITERAL"
 >SDL_ALPHA_TRANSPARENT</TT
 >) is now considered transparent and 255 (<TT
 CLASS="LITERAL"
 >SDL_ALPHA_OPAQUE</TT
 >) is now considered opaque.</P
 ></BLOCKQUOTE
 ></DIV
 ><P
 ><TT
 CLASS="FUNCTION"
 >SDL_SetAlpha</TT
 > is used for setting the per-surface alpha
 value and/or enabling and disabling alpha blending.</P
 ><P
 >The<TT
 CLASS="PARAMETER"
 ><I
 >surface</I
 ></TT
 > parameter specifies which surface whose alpha
 attributes you wish to adjust. <TT
 CLASS="PARAMETER"
 ><I
 >flags</I
 ></TT
 > is used to specify
 whether alpha blending should be used (<TT
 CLASS="LITERAL"
 >SDL_SRCALPHA</TT
 >) and
 whether the surface should use RLE acceleration for blitting
 (<TT
 CLASS="LITERAL"
 >SDL_RLEACCEL</TT
 >). <TT
 CLASS="PARAMETER"
 ><I
 >flags</I
 ></TT
 > can be an OR'd
 combination of these two options, one of these options or 0. If
 <TT
 CLASS="LITERAL"
 >SDL_SRCALPHA</TT
 > is not passed as a flag then all alpha
 information is ignored when blitting the surface. The
 <TT
 CLASS="PARAMETER"
 ><I
 >alpha</I
 ></TT
 > parameter is the per-surface alpha value; a
 surface need not have an alpha channel to use per-surface alpha and blitting
 can still be accelerated with <TT
 CLASS="LITERAL"
 >SDL_RLEACCEL</TT
 >.</P
 ><DIV
 CLASS="NOTE"
 ><BLOCKQUOTE
 CLASS="NOTE"
 ><P
 ><B
 >Note: </B
 >The per-surface alpha value of 128 is considered a special case and
 is optimised, so it's much faster than other per-surface values.</P
 ></BLOCKQUOTE
 ></DIV
 ><P
 >Alpha effects surface blitting in the following ways:</P
 ><DIV
 CLASS="INFORMALTABLE"
 ><A
 NAME="AEN2126"
 ></A
 ><P
 ></P
 ><TABLE
 BORDER="0"
 CLASS="CALSTABLE"
 ><TBODY
 ><TR
 ><TD
 ALIGN="LEFT"
 VALIGN="TOP"
 >RGBA-&#62;RGB with <TT
 CLASS="LITERAL"
 >SDL_SRCALPHA</TT
 ></TD
 ><TD
 ALIGN="LEFT"
 VALIGN="TOP"
 ><P
 >The source is alpha-blended with the destination, using the alpha channel. <TT
 CLASS="LITERAL"
 >SDL_SRCCOLORKEY</TT
 > and the per-surface alpha are ignored.</P
 ></TD
 ></TR
 ><TR
 ><TD
 ALIGN="LEFT"
 VALIGN="TOP"
 >RGBA-&#62;RGB without <TT
 CLASS="LITERAL"
 >SDL_SRCALPHA</TT
 ></TD
 ><TD
 ALIGN="LEFT"
 VALIGN="TOP"
 ><P
 >The RGB data is copied from the source. The source alpha channel and the per-surface alpha value are ignored.</P
 ></TD
 ></TR
 ><TR
 ><TD
 ALIGN="LEFT"
 VALIGN="TOP"
 >RGB-&#62;RGBA with <TT
 CLASS="LITERAL"
 >SDL_SRCALPHA</TT
 ></TD
 ><TD
 ALIGN="LEFT"
 VALIGN="TOP"
 ><P
 >The source is alpha-blended with the destination using the per-surface alpha
 value. If <TT
 CLASS="LITERAL"
 >SDL_SRCCOLORKEY</TT
 > is set, only the pixels not
 matching the colorkey value are copied. The alpha channel of the copied pixels
 is set to opaque.</P
 ></TD
 ></TR
 ><TR
 ><TD
 ALIGN="LEFT"
 VALIGN="TOP"
 >RGB-&#62;RGBA without <TT
 CLASS="LITERAL"
 >SDL_SRCALPHA</TT
 ></TD
 ><TD
 ALIGN="LEFT"
 VALIGN="TOP"
 ><P
 >The RGB data is copied from the source and the alpha value of the copied pixels
 is set to opaque. If <TT
 CLASS="LITERAL"
 >SDL_SRCCOLORKEY</TT
 > is set, only the pixels
 not matching the colorkey value are copied. </P
 ></TD
 ></TR
 ><TR
 ><TD
 ALIGN="LEFT"
 VALIGN="TOP"
 >RGBA-&#62;RGBA with <TT
 CLASS="LITERAL"
 >SDL_SRCALPHA</TT
 ></TD
 ><TD
 ALIGN="LEFT"
 VALIGN="TOP"
 ><P
 >The source is alpha-blended with the destination using the source alpha
 channel. The alpha channel in the destination surface is left untouched.
 <TT
 CLASS="LITERAL"
 >SDL_SRCCOLORKEY</TT
 > is ignored.</P
 ></TD
 ></TR
 ><TR
 ><TD
 ALIGN="LEFT"
 VALIGN="TOP"
 >RGBA-&#62;RGBA without <TT
 CLASS="LITERAL"
 >SDL_SRCALPHA</TT
 ></TD
 ><TD
 ALIGN="LEFT"
 VALIGN="TOP"
 ><P
 >The RGBA data is copied to the destination surface. If <TT
 CLASS="LITERAL"
 >SDL_SRCCOLORKEY</TT
 > is set, only the pixels not matching the colorkey value are copied.</P
 ></TD
 ></TR
 ><TR
 ><TD
 ALIGN="LEFT"
 VALIGN="TOP"
 >RGB-&#62;RGB with <TT
 CLASS="LITERAL"
 >SDL_SRCALPHA</TT
 ></TD
 ><TD
 ALIGN="LEFT"
 VALIGN="TOP"
 ><P
 >The source is alpha-blended with the destination using the per-surface alpha value. If <TT
 CLASS="LITERAL"
 >SDL_SRCCOLORKEY</TT
 > is set, only the pixels not matching the colorkey value are copied.</P
 ></TD
 ></TR
 ><TR
 ><TD
 ALIGN="LEFT"
 VALIGN="TOP"
 >RGB-&#62;RGB without <TT
 CLASS="LITERAL"
 >SDL_SRCALPHA</TT
 ></TD
 ><TD
 ALIGN="LEFT"
 VALIGN="TOP"
 ><P
 >The RGB data is copied from the source. If <TT
 CLASS="LITERAL"
 >SDL_SRCCOLORKEY</TT
 > is set, only the pixels not matching the colorkey value are copied.</P
 ></TD
 ></TR
 ></TBODY
 ></TABLE
 ><P
 ></P
 ></DIV
 ><DIV
 CLASS="NOTE"
 ><BLOCKQUOTE
 CLASS="NOTE"
 ><P
 ><B
 >Note: </B
 > Note that RGBA-&#62;RGBA blits (with SDL_SRCALPHA set) keep the alpha
 of the destination surface. This means that you cannot compose two arbitrary
 RGBA surfaces this way and get the result you would expect from "overlaying"
 them; the destination alpha will work as a mask.</P
 ><P
 >Also note that per-pixel and per-surface alpha cannot be combined;
 the per-pixel alpha is always used if available</P
 ></BLOCKQUOTE
 ></DIV
 ></DIV
 ><DIV
 CLASS="REFSECT1"
 ><A
 NAME="AEN2179"
 ></A
 ><H2
 >Return Value</H2
 ><P
 >This function returns <SPAN
 CLASS="RETURNVALUE"
 >0</SPAN
 >, or
 <SPAN
 CLASS="RETURNVALUE"
 >-1</SPAN
 > if there was an error.</P
 ></DIV
 ><DIV
 CLASS="REFSECT1"
 ><A
 NAME="AEN2184"
 ></A
 ><H2
 >See Also</H2
 ><P
 ><A
 HREF="sdlmaprgba.html"
 ><TT
 CLASS="FUNCTION"
 >SDL_MapRGBA</TT
 ></A
 >,
 <A
 HREF="sdlgetrgba.html"
 ><TT
 CLASS="FUNCTION"
 >SDL_GetRGBA</TT
 ></A
 >,
 <A
 HREF="sdldisplayformatalpha.html"
 ><TT
 CLASS="FUNCTION"
 >SDL_DisplayFormatAlpha</TT
 ></A
 >,
 <A
 HREF="sdlblitsurface.html"
 ><TT
 CLASS="FUNCTION"
 >SDL_BlitSurface</TT
 ></A
 ></P
 ></DIV
 ><DIV
 CLASS="NAVFOOTER"
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 ALIGN="LEFT"
 WIDTH="100%"><TABLE
 SUMMARY="Footer navigation table"
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 WIDTH="33%"
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 HREF="sdlsetcolorkey.html"
 ACCESSKEY="P"
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 WIDTH="34%"
 ALIGN="center"
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 HREF="index.html"
 ACCESSKEY="H"
 >Home</A
 ></TD
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 WIDTH="33%"
 ALIGN="right"
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	<HTML
	><HEAD
	><TITLE
	>SDL_SetAlpha</TITLE
	><META
	NAME="GENERATOR"
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	"><LINK
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	TITLE="SDL Library Documentation"
	HREF="index.html"><LINK
	REL="UP"
	TITLE="Video"
	HREF="video.html"><LINK
	REL="PREVIOUS"
	TITLE="SDL_SetColorKey"
	HREF="sdlsetcolorkey.html"><LINK
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	TITLE="SDL_SetClipRect"
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	><BODY
	CLASS="REFENTRY"
	BGCOLOR="#FFF8DC"
	TEXT="#000000"
	LINK="#0000ee"
	VLINK="#551a8b"
	ALINK="#ff0000"
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	CLASS="NAVHEADER"
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	>SDL Library Documentation</TH
	></TR
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	HREF="sdlsetcolorkey.html"
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	>Prev</A
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	HREF="sdlsetcliprect.html"
	ACCESSKEY="N"
	>Next</A
	></TD
	></TR
	></TABLE
	><HR
	ALIGN="LEFT"
	WIDTH="100%"></DIV
	><H1
	><A
	NAME="SDLSETALPHA"
	></A
	>SDL_SetAlpha</H1
	><DIV
	CLASS="REFNAMEDIV"
	><A
	NAME="AEN2096"
	></A
	><H2
	>Name</H2
	>SDL_SetAlpha -- Adjust the alpha properties of a surface</DIV
	><DIV
	CLASS="REFSYNOPSISDIV"
	><A
	NAME="AEN2099"
	></A
	><H2
	>Synopsis</H2
	><DIV
	CLASS="FUNCSYNOPSIS"
	><A
	NAME="AEN2100"
	></A
	><P
	></P
	><PRE
	CLASS="FUNCSYNOPSISINFO"
	>#include "SDL.h"</PRE
	><P
	><CODE
	><CODE
	CLASS="FUNCDEF"
	>int <B
	CLASS="FSFUNC"
	>SDL_SetAlpha</B
	></CODE
	>(SDL_Surface *surface, Uint32 flag, Uint8 alpha);</CODE
	></P
	><P
	></P
	></DIV
	></DIV
	><DIV
	CLASS="REFSECT1"
	><A
	NAME="AEN2106"
	></A
	><H2
	>Description</H2
	><DIV
	CLASS="NOTE"
	><BLOCKQUOTE
	CLASS="NOTE"
	><P
	><B
	>Note: </B
	>This function and the semantics of SDL alpha blending have changed since version 1.1.4. Up until version 1.1.5, an alpha value of 0 was considered opaque and a value of 255 was considered transparent. This has now been inverted: 0 (<TT
	CLASS="LITERAL"
	>SDL_ALPHA_TRANSPARENT</TT
	>) is now considered transparent and 255 (<TT
	CLASS="LITERAL"
	>SDL_ALPHA_OPAQUE</TT
	>) is now considered opaque.</P
	></BLOCKQUOTE
	></DIV
	><P
	><TT
	CLASS="FUNCTION"
	>SDL_SetAlpha</TT
	> is used for setting the per-surface alpha
	value and/or enabling and disabling alpha blending.</P
	><P
	>The<TT
	CLASS="PARAMETER"
	><I
	>surface</I
	></TT
	> parameter specifies which surface whose alpha
	attributes you wish to adjust. <TT
	CLASS="PARAMETER"
	><I
	>flags</I
	></TT
	> is used to specify
	whether alpha blending should be used (<TT
	CLASS="LITERAL"
	>SDL_SRCALPHA</TT
	>) and
	whether the surface should use RLE acceleration for blitting
	(<TT
	CLASS="LITERAL"
	>SDL_RLEACCEL</TT
	>). <TT
	CLASS="PARAMETER"
	><I
	>flags</I
	></TT
	> can be an OR'd
	combination of these two options, one of these options or 0. If
	<TT
	CLASS="LITERAL"
	>SDL_SRCALPHA</TT
	> is not passed as a flag then all alpha
	information is ignored when blitting the surface. The
	<TT
	CLASS="PARAMETER"
	><I
	>alpha</I
	></TT
	> parameter is the per-surface alpha value; a
	surface need not have an alpha channel to use per-surface alpha and blitting
	can still be accelerated with <TT
	CLASS="LITERAL"
	>SDL_RLEACCEL</TT
	>.</P
	><DIV
	CLASS="NOTE"
	><BLOCKQUOTE
	CLASS="NOTE"
	><P
	><B
	>Note: </B
	>The per-surface alpha value of 128 is considered a special case and
	is optimised, so it's much faster than other per-surface values.</P
	></BLOCKQUOTE
	></DIV
	><P
	>Alpha effects surface blitting in the following ways:</P
	><DIV
	CLASS="INFORMALTABLE"
	><A
	NAME="AEN2126"
	></A
	><P
	></P
	><TABLE
	BORDER="0"
	CLASS="CALSTABLE"
	><TBODY
	><TR
	><TD
	ALIGN="LEFT"
	VALIGN="TOP"
	>RGBA->RGB with <TT
	CLASS="LITERAL"
	>SDL_SRCALPHA</TT
	></TD
	><TD
	ALIGN="LEFT"
	VALIGN="TOP"
	><P
	>The source is alpha-blended with the destination, using the alpha channel. <TT
	CLASS="LITERAL"
	>SDL_SRCCOLORKEY</TT
	> and the per-surface alpha are ignored.</P
	></TD
	></TR
	><TR
	><TD
	ALIGN="LEFT"
	VALIGN="TOP"
	>RGBA->RGB without <TT
	CLASS="LITERAL"
	>SDL_SRCALPHA</TT
	></TD
	><TD
	ALIGN="LEFT"
	VALIGN="TOP"
	><P
	>The RGB data is copied from the source. The source alpha channel and the per-surface alpha value are ignored.</P
	></TD
	></TR
	><TR
	><TD
	ALIGN="LEFT"
	VALIGN="TOP"
	>RGB->RGBA with <TT
	CLASS="LITERAL"
	>SDL_SRCALPHA</TT
	></TD
	><TD
	ALIGN="LEFT"
	VALIGN="TOP"
	><P
	>The source is alpha-blended with the destination using the per-surface alpha
	value. If <TT
	CLASS="LITERAL"
	>SDL_SRCCOLORKEY</TT
	> is set, only the pixels not
	matching the colorkey value are copied. The alpha channel of the copied pixels
	is set to opaque.</P
	></TD
	></TR
	><TR
	><TD
	ALIGN="LEFT"
	VALIGN="TOP"
	>RGB->RGBA without <TT
	CLASS="LITERAL"
	>SDL_SRCALPHA</TT
	></TD
	><TD
	ALIGN="LEFT"
	VALIGN="TOP"
	><P
	>The RGB data is copied from the source and the alpha value of the copied pixels
	is set to opaque. If <TT
	CLASS="LITERAL"
	>SDL_SRCCOLORKEY</TT
	> is set, only the pixels
	not matching the colorkey value are copied. </P
	></TD
	></TR
	><TR
	><TD
	ALIGN="LEFT"
	VALIGN="TOP"
	>RGBA->RGBA with <TT
	CLASS="LITERAL"
	>SDL_SRCALPHA</TT
	></TD
	><TD
	ALIGN="LEFT"
	VALIGN="TOP"
	><P
	>The source is alpha-blended with the destination using the source alpha
	channel. The alpha channel in the destination surface is left untouched.
	<TT
	CLASS="LITERAL"
	>SDL_SRCCOLORKEY</TT
	> is ignored.</P
	></TD
	></TR
	><TR
	><TD
	ALIGN="LEFT"
	VALIGN="TOP"
	>RGBA->RGBA without <TT
	CLASS="LITERAL"
	>SDL_SRCALPHA</TT
	></TD
	><TD
	ALIGN="LEFT"
	VALIGN="TOP"
	><P
	>The RGBA data is copied to the destination surface. If <TT
	CLASS="LITERAL"
	>SDL_SRCCOLORKEY</TT
	> is set, only the pixels not matching the colorkey value are copied.</P
	></TD
	></TR
	><TR
	><TD
	ALIGN="LEFT"
	VALIGN="TOP"
	>RGB->RGB with <TT
	CLASS="LITERAL"
	>SDL_SRCALPHA</TT
	></TD
	><TD
	ALIGN="LEFT"
	VALIGN="TOP"
	><P
	>The source is alpha-blended with the destination using the per-surface alpha value. If <TT
	CLASS="LITERAL"
	>SDL_SRCCOLORKEY</TT
	> is set, only the pixels not matching the colorkey value are copied.</P
	></TD
	></TR
	><TR
	><TD
	ALIGN="LEFT"
	VALIGN="TOP"
	>RGB->RGB without <TT
	CLASS="LITERAL"
	>SDL_SRCALPHA</TT
	></TD
	><TD
	ALIGN="LEFT"
	VALIGN="TOP"
	><P
	>The RGB data is copied from the source. If <TT
	CLASS="LITERAL"
	>SDL_SRCCOLORKEY</TT
	> is set, only the pixels not matching the colorkey value are copied.</P
	></TD
	></TR
	></TBODY
	></TABLE
	><P
	></P
	></DIV
	><DIV
	CLASS="NOTE"
	><BLOCKQUOTE
	CLASS="NOTE"
	><P
	><B
	>Note: </B
	> Note that RGBA->RGBA blits (with SDL_SRCALPHA set) keep the alpha
	of the destination surface. This means that you cannot compose two arbitrary
	RGBA surfaces this way and get the result you would expect from "overlaying"
	them; the destination alpha will work as a mask.</P
	><P
	>Also note that per-pixel and per-surface alpha cannot be combined;
	the per-pixel alpha is always used if available</P
	></BLOCKQUOTE
	></DIV
	></DIV
	><DIV
	CLASS="REFSECT1"
	><A
	NAME="AEN2179"
	></A
	><H2
	>Return Value</H2
	><P
	>This function returns <SPAN
	CLASS="RETURNVALUE"
	>0</SPAN
	>, or
	<SPAN
	CLASS="RETURNVALUE"
	>-1</SPAN
	> if there was an error.</P
	></DIV
	><DIV
	CLASS="REFSECT1"
	><A
	NAME="AEN2184"
	></A
	><H2
	>See Also</H2
	><P
	><A
	HREF="sdlmaprgba.html"
	><TT
	CLASS="FUNCTION"
	>SDL_MapRGBA</TT
	></A
	>,
	<A
	HREF="sdlgetrgba.html"
	><TT
	CLASS="FUNCTION"
	>SDL_GetRGBA</TT
	></A
	>,
	<A
	HREF="sdldisplayformatalpha.html"
	><TT
	CLASS="FUNCTION"
	>SDL_DisplayFormatAlpha</TT
	></A
	>,
	<A
	HREF="sdlblitsurface.html"
	><TT
	CLASS="FUNCTION"
	>SDL_BlitSurface</TT
	></A
	></P
	></DIV
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