distrib/sdl-1.2.15/docs/html/sdlcreatergbsurface.html - platform/external/qemu - Git at Google

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 ><H1
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 >SDL_CreateRGBSurface</H1
 ><DIV
 CLASS="REFNAMEDIV"
 ><A
 NAME="AEN1773"
 ></A
 ><H2
 >Name</H2
 >SDL_CreateRGBSurface&nbsp;--&nbsp;Create an empty SDL_Surface</DIV
 ><DIV
 CLASS="REFSYNOPSISDIV"
 ><A
 NAME="AEN1776"
 ></A
 ><H2
 >Synopsis</H2
 ><DIV
 CLASS="FUNCSYNOPSIS"
 ><A
 NAME="AEN1777"
 ></A
 ><P
 ></P
 ><PRE
 CLASS="FUNCSYNOPSISINFO"
 >#include "SDL.h"</PRE
 ><P
 ><CODE
 ><CODE
 CLASS="FUNCDEF"
 >SDL_Surface *<B
 CLASS="FSFUNC"
 >SDL_CreateRGBSurface</B
 ></CODE
 >(Uint32 flags, int width, int height, int depth, Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask);</CODE
 ></P
 ><P
 ></P
 ></DIV
 ></DIV
 ><DIV
 CLASS="REFSECT1"
 ><A
 NAME="AEN1783"
 ></A
 ><H2
 >Description</H2
 ><P
 >Allocate an empty surface (must be called after <A
 HREF="sdlsetvideomode.html"
 >SDL_SetVideoMode</A
 >)</P
 ><P
 >If <TT
 CLASS="PARAMETER"
 ><I
 >depth</I
 ></TT
 > is 8 bits an empty palette is allocated for the surface, otherwise a 'packed-pixel' <A
 HREF="sdlpixelformat.html"
 ><SPAN
 CLASS="STRUCTNAME"
 >SDL_PixelFormat</SPAN
 ></A
 > is created using the <TT
 CLASS="PARAMETER"
 ><I
 >[RGBA]mask</I
 ></TT
 >'s provided (see <A
 HREF="sdlpixelformat.html"
 ><SPAN
 CLASS="STRUCTNAME"
 >SDL_PixelFormat</SPAN
 ></A
 >). The <TT
 CLASS="PARAMETER"
 ><I
 >flags</I
 ></TT
 > specifies the type of surface that should be created, it is an OR'd combination of the following possible values.</P
 ><DIV
 CLASS="INFORMALTABLE"
 ><A
 NAME="AEN1795"
 ></A
 ><P
 ></P
 ><TABLE
 BORDER="1"
 CLASS="CALSTABLE"
 ><TBODY
 ><TR
 ><TD
 ALIGN="LEFT"
 VALIGN="TOP"
 ><TT
 CLASS="LITERAL"
 >SDL_SWSURFACE</TT
 ></TD
 ><TD
 ALIGN="LEFT"
 VALIGN="TOP"
 >SDL will create the surface in system memory. This improves the performance of pixel level access, however you may not be able to take advantage of some types of hardware blitting.</TD
 ></TR
 ><TR
 ><TD
 ALIGN="LEFT"
 VALIGN="TOP"
 ><TT
 CLASS="LITERAL"
 >SDL_HWSURFACE</TT
 ></TD
 ><TD
 ALIGN="LEFT"
 VALIGN="TOP"
 >SDL will attempt to create the surface in video memory. This will allow SDL to take advantage of Video-&#62;Video blits (which are often accelerated).</TD
 ></TR
 ><TR
 ><TD
 ALIGN="LEFT"
 VALIGN="TOP"
 ><TT
 CLASS="LITERAL"
 >SDL_SRCCOLORKEY</TT
 ></TD
 ><TD
 ALIGN="LEFT"
 VALIGN="TOP"
 >This flag turns on colourkeying for blits from this surface. If
 <TT
 CLASS="LITERAL"
 >SDL_HWSURFACE</TT
 > is also specified and colourkeyed blits
 are hardware-accelerated, then SDL will attempt to place the surface in
 video memory.
 Use <A
 HREF="sdlsetcolorkey.html"
 ><TT
 CLASS="FUNCTION"
 >SDL_SetColorKey</TT
 ></A
 >
 to set or clear this flag after surface creation.</TD
 ></TR
 ><TR
 ><TD
 ALIGN="LEFT"
 VALIGN="TOP"
 ><TT
 CLASS="LITERAL"
 >SDL_SRCALPHA</TT
 ></TD
 ><TD
 ALIGN="LEFT"
 VALIGN="TOP"
 >This flag turns on alpha-blending for blits from this surface. If
 <TT
 CLASS="LITERAL"
 >SDL_HWSURFACE</TT
 > is also specified and alpha-blending blits
 are hardware-accelerated, then the surface will be placed in video memory if
 possible.
 Use <A
 HREF="sdlsetalpha.html"
 ><TT
 CLASS="FUNCTION"
 >SDL_SetAlpha</TT
 ></A
 > to
 set or clear this flag after surface creation.</TD
 ></TR
 ></TBODY
 ></TABLE
 ><P
 ></P
 ></DIV
 ><DIV
 CLASS="NOTE"
 ><BLOCKQUOTE
 CLASS="NOTE"
 ><P
 ><B
 >Note: </B
 >If an alpha-channel is specified (that is, if <TT
 CLASS="PARAMETER"
 ><I
 >Amask</I
 ></TT
 > is
 nonzero), then the <TT
 CLASS="LITERAL"
 >SDL_SRCALPHA</TT
 > flag is automatically
 set. You may remove this flag by calling
 <A
 HREF="sdlsetalpha.html"
 ><TT
 CLASS="FUNCTION"
 >SDL_SetAlpha</TT
 ></A
 >
 after surface creation.</P
 ></BLOCKQUOTE
 ></DIV
 ></DIV
 ><DIV
 CLASS="REFSECT1"
 ><A
 NAME="AEN1826"
 ></A
 ><H2
 >Return Value</H2
 ><P
 >Returns the created surface, or <SPAN
 CLASS="RETURNVALUE"
 >NULL</SPAN
 > upon error.</P
 ></DIV
 ><DIV
 CLASS="REFSECT1"
 ><A
 NAME="AEN1830"
 ></A
 ><H2
 >Example</H2
 ><PRE
 CLASS="PROGRAMLISTING"
 >    /* Create a 32-bit surface with the bytes of each pixel in R,G,B,A order,
        as expected by OpenGL for textures */
     SDL_Surface *surface;
     Uint32 rmask, gmask, bmask, amask;

     /* SDL interprets each pixel as a 32-bit number, so our masks must depend
        on the endianness (byte order) of the machine */
 #if SDL_BYTEORDER == SDL_BIG_ENDIAN
     rmask = 0xff000000;
     gmask = 0x00ff0000;
     bmask = 0x0000ff00;
     amask = 0x000000ff;
 #else
     rmask = 0x000000ff;
     gmask = 0x0000ff00;
     bmask = 0x00ff0000;
     amask = 0xff000000;
 #endif

     surface = SDL_CreateRGBSurface(SDL_SWSURFACE, width, height, 32,
                                    rmask, gmask, bmask, amask);
     if(surface == NULL) {
         fprintf(stderr, "CreateRGBSurface failed: %s\n", SDL_GetError());
         exit(1);
     }</PRE
 ></DIV
 ><DIV
 CLASS="REFSECT1"
 ><A
 NAME="AEN1833"
 ></A
 ><H2
 >See Also</H2
 ><P
 ><A
 HREF="sdlcreatergbsurfacefrom.html"
 ><TT
 CLASS="FUNCTION"
 >SDL_CreateRGBSurfaceFrom</TT
 ></A
 >,
 <A
 HREF="sdlfreesurface.html"
 ><TT
 CLASS="FUNCTION"
 >SDL_FreeSurface</TT
 ></A
 >,
 <A
 HREF="sdlsetvideomode.html"
 ><TT
 CLASS="FUNCTION"
 >SDL_SetVideoMode</TT
 ></A
 >,
 <A
 HREF="sdllocksurface.html"
 ><TT
 CLASS="FUNCTION"
 >SDL_LockSurface</TT
 ></A
 >,
 <A
 HREF="sdlpixelformat.html"
 ><SPAN
 CLASS="STRUCTNAME"
 >SDL_PixelFormat</SPAN
 ></A
 >,
 <A
 HREF="sdlsurface.html"
 ><SPAN
 CLASS="STRUCTNAME"
 >SDL_Surface</SPAN
 ></A
 >
 <A
 HREF="sdlsetalpha.html"
 ><TT
 CLASS="FUNCTION"
 >SDL_SetAlpha</TT
 ></A
 >
 <A
 HREF="sdlsetcolorkey.html"
 ><TT
 CLASS="FUNCTION"
 >SDL_SetColorKey</TT
 ></A
 ></P
 ></DIV
 ><DIV
 CLASS="NAVFOOTER"
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 SUMMARY="Footer navigation table"
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 WIDTH="33%"
 ALIGN="left"
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 HREF="sdlgetrgba.html"
 ACCESSKEY="P"
 >Prev</A
 ></TD
 ><TD
 WIDTH="34%"
 ALIGN="center"
 VALIGN="top"
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 HREF="index.html"
 ACCESSKEY="H"
 >Home</A
 ></TD
 ><TD
 WIDTH="33%"
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 WIDTH="33%"
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 >SDL_CreateRGBSurfaceFrom</TD
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 ></HTML
 >
	<HTML
	><HEAD
	><TITLE
	>SDL_CreateRGBSurface</TITLE
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	TITLE="SDL_GetRGBA"
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	TITLE="SDL_CreateRGBSurfaceFrom"
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	><BODY
	CLASS="REFENTRY"
	BGCOLOR="#FFF8DC"
	TEXT="#000000"
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	>SDL Library Documentation</TH
	></TR
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	WIDTH="10%"
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	VALIGN="bottom"
	><A
	HREF="sdlgetrgba.html"
	ACCESSKEY="P"
	>Prev</A
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	HREF="sdlcreatergbsurfacefrom.html"
	ACCESSKEY="N"
	>Next</A
	></TD
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	></TABLE
	><HR
	ALIGN="LEFT"
	WIDTH="100%"></DIV
	><H1
	><A
	NAME="SDLCREATERGBSURFACE"
	></A
	>SDL_CreateRGBSurface</H1
	><DIV
	CLASS="REFNAMEDIV"
	><A
	NAME="AEN1773"
	></A
	><H2
	>Name</H2
	>SDL_CreateRGBSurface -- Create an empty SDL_Surface</DIV
	><DIV
	CLASS="REFSYNOPSISDIV"
	><A
	NAME="AEN1776"
	></A
	><H2
	>Synopsis</H2
	><DIV
	CLASS="FUNCSYNOPSIS"
	><A
	NAME="AEN1777"
	></A
	><P
	></P
	><PRE
	CLASS="FUNCSYNOPSISINFO"
	>#include "SDL.h"</PRE
	><P
	><CODE
	><CODE
	CLASS="FUNCDEF"
	>SDL_Surface *<B
	CLASS="FSFUNC"
	>SDL_CreateRGBSurface</B
	></CODE
	>(Uint32 flags, int width, int height, int depth, Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask);</CODE
	></P
	><P
	></P
	></DIV
	></DIV
	><DIV
	CLASS="REFSECT1"
	><A
	NAME="AEN1783"
	></A
	><H2
	>Description</H2
	><P
	>Allocate an empty surface (must be called after <A
	HREF="sdlsetvideomode.html"
	>SDL_SetVideoMode</A
	>)</P
	><P
	>If <TT
	CLASS="PARAMETER"
	><I
	>depth</I
	></TT
	> is 8 bits an empty palette is allocated for the surface, otherwise a 'packed-pixel' <A
	HREF="sdlpixelformat.html"
	><SPAN
	CLASS="STRUCTNAME"
	>SDL_PixelFormat</SPAN
	></A
	> is created using the <TT
	CLASS="PARAMETER"
	><I
	>[RGBA]mask</I
	></TT
	>'s provided (see <A
	HREF="sdlpixelformat.html"
	><SPAN
	CLASS="STRUCTNAME"
	>SDL_PixelFormat</SPAN
	></A
	>). The <TT
	CLASS="PARAMETER"
	><I
	>flags</I
	></TT
	> specifies the type of surface that should be created, it is an OR'd combination of the following possible values.</P
	><DIV
	CLASS="INFORMALTABLE"
	><A
	NAME="AEN1795"
	></A
	><P
	></P
	><TABLE
	BORDER="1"
	CLASS="CALSTABLE"
	><TBODY
	><TR
	><TD
	ALIGN="LEFT"
	VALIGN="TOP"
	><TT
	CLASS="LITERAL"
	>SDL_SWSURFACE</TT
	></TD
	><TD
	ALIGN="LEFT"
	VALIGN="TOP"
	>SDL will create the surface in system memory. This improves the performance of pixel level access, however you may not be able to take advantage of some types of hardware blitting.</TD
	></TR
	><TR
	><TD
	ALIGN="LEFT"
	VALIGN="TOP"
	><TT
	CLASS="LITERAL"
	>SDL_HWSURFACE</TT
	></TD
	><TD
	ALIGN="LEFT"
	VALIGN="TOP"
	>SDL will attempt to create the surface in video memory. This will allow SDL to take advantage of Video->Video blits (which are often accelerated).</TD
	></TR
	><TR
	><TD
	ALIGN="LEFT"
	VALIGN="TOP"
	><TT
	CLASS="LITERAL"
	>SDL_SRCCOLORKEY</TT
	></TD
	><TD
	ALIGN="LEFT"
	VALIGN="TOP"
	>This flag turns on colourkeying for blits from this surface. If
	<TT
	CLASS="LITERAL"
	>SDL_HWSURFACE</TT
	> is also specified and colourkeyed blits
	are hardware-accelerated, then SDL will attempt to place the surface in
	video memory.
	Use <A
	HREF="sdlsetcolorkey.html"
	><TT
	CLASS="FUNCTION"
	>SDL_SetColorKey</TT
	></A
	>
	to set or clear this flag after surface creation.</TD
	></TR
	><TR
	><TD
	ALIGN="LEFT"
	VALIGN="TOP"
	><TT
	CLASS="LITERAL"
	>SDL_SRCALPHA</TT
	></TD
	><TD
	ALIGN="LEFT"
	VALIGN="TOP"
	>This flag turns on alpha-blending for blits from this surface. If
	<TT
	CLASS="LITERAL"
	>SDL_HWSURFACE</TT
	> is also specified and alpha-blending blits
	are hardware-accelerated, then the surface will be placed in video memory if
	possible.
	Use <A
	HREF="sdlsetalpha.html"
	><TT
	CLASS="FUNCTION"
	>SDL_SetAlpha</TT
	></A
	> to
	set or clear this flag after surface creation.</TD
	></TR
	></TBODY
	></TABLE
	><P
	></P
	></DIV
	><DIV
	CLASS="NOTE"
	><BLOCKQUOTE
	CLASS="NOTE"
	><P
	><B
	>Note: </B
	>If an alpha-channel is specified (that is, if <TT
	CLASS="PARAMETER"
	><I
	>Amask</I
	></TT
	> is
	nonzero), then the <TT
	CLASS="LITERAL"
	>SDL_SRCALPHA</TT
	> flag is automatically
	set. You may remove this flag by calling
	<A
	HREF="sdlsetalpha.html"
	><TT
	CLASS="FUNCTION"
	>SDL_SetAlpha</TT
	></A
	>
	after surface creation.</P
	></BLOCKQUOTE
	></DIV
	></DIV
	><DIV
	CLASS="REFSECT1"
	><A
	NAME="AEN1826"
	></A
	><H2
	>Return Value</H2
	><P
	>Returns the created surface, or <SPAN
	CLASS="RETURNVALUE"
	>NULL</SPAN
	> upon error.</P
	></DIV
	><DIV
	CLASS="REFSECT1"
	><A
	NAME="AEN1830"
	></A
	><H2
	>Example</H2
	><PRE
	CLASS="PROGRAMLISTING"
	> /* Create a 32-bit surface with the bytes of each pixel in R,G,B,A order,
	as expected by OpenGL for textures */
	SDL_Surface *surface;
	Uint32 rmask, gmask, bmask, amask;

	/* SDL interprets each pixel as a 32-bit number, so our masks must depend
	on the endianness (byte order) of the machine */
	#if SDL_BYTEORDER == SDL_BIG_ENDIAN
	rmask = 0xff000000;
	gmask = 0x00ff0000;
	bmask = 0x0000ff00;
	amask = 0x000000ff;
	#else
	rmask = 0x000000ff;
	gmask = 0x0000ff00;
	bmask = 0x00ff0000;
	amask = 0xff000000;
	#endif

	surface = SDL_CreateRGBSurface(SDL_SWSURFACE, width, height, 32,
	rmask, gmask, bmask, amask);
	if(surface == NULL) {
	fprintf(stderr, "CreateRGBSurface failed: %s\n", SDL_GetError());
	exit(1);
	}</PRE
	></DIV
	><DIV
	CLASS="REFSECT1"
	><A
	NAME="AEN1833"
	></A
	><H2
	>See Also</H2
	><P
	><A
	HREF="sdlcreatergbsurfacefrom.html"
	><TT
	CLASS="FUNCTION"
	>SDL_CreateRGBSurfaceFrom</TT
	></A
	>,
	<A
	HREF="sdlfreesurface.html"
	><TT
	CLASS="FUNCTION"
	>SDL_FreeSurface</TT
	></A
	>,
	<A
	HREF="sdlsetvideomode.html"
	><TT
	CLASS="FUNCTION"
	>SDL_SetVideoMode</TT
	></A
	>,
	<A
	HREF="sdllocksurface.html"
	><TT
	CLASS="FUNCTION"
	>SDL_LockSurface</TT
	></A
	>,
	<A
	HREF="sdlpixelformat.html"
	><SPAN
	CLASS="STRUCTNAME"
	>SDL_PixelFormat</SPAN
	></A
	>,
	<A
	HREF="sdlsurface.html"
	><SPAN
	CLASS="STRUCTNAME"
	>SDL_Surface</SPAN
	></A
	>
	<A
	HREF="sdlsetalpha.html"
	><TT
	CLASS="FUNCTION"
	>SDL_SetAlpha</TT
	></A
	>
	<A
	HREF="sdlsetcolorkey.html"
	><TT
	CLASS="FUNCTION"
	>SDL_SetColorKey</TT
	></A
	></P
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