Mercurial > sdl-ios-xcode
view docs/html/sdldisplayformatalpha.html @ 701:aaf3b8af6616
Date: Sat, 30 Aug 2003 16:28:10 +0300
From: "Mike Gorchak"
Subject: Re: SDL 1.2.6
- minor changes about shared library building under QNX6 into README.QNX
- added forgotten libSDLmain.a into distribution, SDL.qpg.in
- added header guards to the all headers.
- fixed fullscreen double buffered mode.
- fixed Photon crashes after/during using fullscreen OpenGL modes.
- added GL_MakeCurrent function.
- added SDL_VIDEOEXPOSE event, when OpenGL window have been resized
- added more HAVE_OPENGL checks to avoid dead code compilation without using OpenGL
- finished code reorganization (began into previous patches).
author | Sam Lantinga <slouken@libsdl.org> |
---|---|
date | Sat, 30 Aug 2003 17:07:59 +0000 |
parents | e5bc29de3f0a |
children | 355632dca928 |
line wrap: on
line source
<HTML ><HEAD ><TITLE >SDL_DisplayFormatAlpha</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.64 "><LINK REL="HOME" TITLE="SDL Library Documentation" HREF="index.html"><LINK REL="UP" TITLE="Video" HREF="video.html"><LINK REL="PREVIOUS" TITLE="SDL_DisplayFormat" HREF="sdldisplayformat.html"><LINK REL="NEXT" TITLE="SDL_WarpMouse" HREF="sdlwarpmouse.html"></HEAD ><BODY CLASS="REFENTRY" BGCOLOR="#FFF8DC" TEXT="#000000" LINK="#0000ee" VLINK="#551a8b" ALINK="#ff0000" ><DIV CLASS="NAVHEADER" ><TABLE WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="3" ALIGN="center" >SDL Library Documentation</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="sdldisplayformat.html" >Prev</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="sdlwarpmouse.html" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="SDLDISPLAYFORMATALPHA" >SDL_DisplayFormatAlpha</A ></H1 ><DIV CLASS="REFNAMEDIV" ><A NAME="AEN2048" ></A ><H2 >Name</H2 >SDL_DisplayFormatAlpha -- Convert a surface to the display format</DIV ><DIV CLASS="REFSYNOPSISDIV" ><A NAME="AEN2051" ></A ><H2 >Synopsis</H2 ><DIV CLASS="FUNCSYNOPSIS" ><A NAME="AEN2052" ></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="AEN2058" ></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="AEN2065" ></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="AEN2069" ></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 CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="sdldisplayformat.html" >Prev</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="index.html" >Home</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="sdlwarpmouse.html" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >SDL_DisplayFormat</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="video.html" >Up</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >SDL_WarpMouse</TD ></TR ></TABLE ></DIV ></BODY ></HTML >