📄 sdlgetrgba.html

📁 VC5.6.7的一个扩展库。跟DirectX的功能差不多。
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<HTML><HEAD><TITLE>SDL_GetRGBA</TITLE><METANAME="GENERATOR"CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+"><LINKREL="HOME"TITLE="SDL Library Documentation"HREF="index.html"><LINKREL="UP"TITLE="Video"HREF="video.html"><LINKREL="PREVIOUS"TITLE="SDL_GetRGB"HREF="sdlgetrgb.html"><LINKREL="NEXT"TITLE="SDL_CreateRGBSurface"HREF="sdlcreatergbsurface.html"></HEAD><BODYCLASS="REFENTRY"BGCOLOR="#FFF8DC"TEXT="#000000"LINK="#0000ee"VLINK="#551a8b"ALINK="#ff0000"><DIVCLASS="NAVHEADER"><TABLESUMMARY="Header navigation table"WIDTH="100%"BORDER="0"CELLPADDING="0"CELLSPACING="0"><TR><THCOLSPAN="3"ALIGN="center">SDL Library Documentation</TH></TR><TR><TDWIDTH="10%"ALIGN="left"VALIGN="bottom"><AHREF="sdlgetrgb.html"ACCESSKEY="P">Prev</A></TD><TDWIDTH="80%"ALIGN="center"VALIGN="bottom"></TD><TDWIDTH="10%"ALIGN="right"VALIGN="bottom"><AHREF="sdlcreatergbsurface.html"ACCESSKEY="N">Next</A></TD></TR></TABLE><HRALIGN="LEFT"WIDTH="100%"></DIV><H1><ANAME="SDLGETRGBA"></A>SDL_GetRGBA</H1><DIVCLASS="REFNAMEDIV"><ANAME="AEN1747"></A><H2>Name</H2>SDL_GetRGBA&nbsp;--&nbsp;Get RGBA values from a pixel in the specified pixel format.</DIV><DIVCLASS="REFSYNOPSISDIV"><ANAME="AEN1750"></A><H2>Synopsis</H2><DIVCLASS="FUNCSYNOPSIS"><ANAME="AEN1751"></A><P></P><PRECLASS="FUNCSYNOPSISINFO">#include "SDL.h"</PRE><P><CODE><CODECLASS="FUNCDEF">void <BCLASS="FSFUNC">SDL_GetRGBA</B></CODE>(Uint32 pixel, SDL_PixelFormat *fmt, Uint8 *r, Uint8 *g, Uint8 *b, Uint8 *a);</CODE></P><P></P></DIV></DIV><DIVCLASS="REFSECT1"><ANAME="AEN1757"></A><H2>Description</H2><P>Get RGBA component values from a pixel stored in the specified pixel format.</P><P>This function uses the entire 8-bit [0..255] range when converting colorcomponents from pixel formats with less than 8-bits per RGB component(e.g., a completely white pixel in 16-bit RGB565 format would return[0xff, 0xff, 0xff] not [0xf8, 0xfc, 0xf8]).</P><P>If the surface has no alpha component, the alpha will be returned as 0xff(100% opaque).</P></DIV><DIVCLASS="REFSECT1"><ANAME="AEN1762"></A><H2>See Also</H2><P><AHREF="sdlgetrgb.html">SDL_GetRGB</A>,<AHREF="sdlmaprgb.html">SDL_MapRGB</A>,<AHREF="sdlmaprgba.html">SDL_MapRGBA</A>,<AHREF="sdlpixelformat.html">SDL_PixelFormat</A></P></DIV><DIVCLASS="NAVFOOTER"><HRALIGN="LEFT"WIDTH="100%"><TABLESUMMARY="Footer navigation table"WIDTH="100%"BORDER="0"CELLPADDING="0"CELLSPACING="0"><TR><TDWIDTH="33%"ALIGN="left"VALIGN="top"><AHREF="sdlgetrgb.html"ACCESSKEY="P">Prev</A></TD><TDWIDTH="34%"ALIGN="center"VALIGN="top"><AHREF="index.html"ACCESSKEY="H">Home</A></TD><TDWIDTH="33%"ALIGN="right"VALIGN="top"><AHREF="sdlcreatergbsurface.html"ACCESSKEY="N">Next</A></TD></TR><TR><TDWIDTH="33%"ALIGN="left"VALIGN="top">SDL_GetRGB</TD><TDWIDTH="34%"ALIGN="center"VALIGN="top"><AHREF="video.html"ACCESSKEY="U">Up</A></TD><TDWIDTH="33%"ALIGN="right"VALIGN="top">SDL_CreateRGBSurface</TD></TR></TABLE></DIV></BODY></HTML>
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