view docs/man3/SDL_MapRGBA.3 @ 4145:f00b6b19d57e SDL-1.2

Date: Sat, 5 Apr 2008 19:54:28 -0700 From: "Chris Peterson" To: sdl@lists.libsdl.org Subject: [SDL] [PATCH] SDLMain.m: fix a bug and some warnings for Mac OS X Here are some small fixes for the src/main/macosx/SDLMain.m source file used by Mac OS X apps: 1. setupWorkingDirectory() called chdir() within an assert(), which gets compiled out in non-debug builds. 2. When some of gcc's optional warnings are enabled, it complains about some implicit casts and the use of #import in SDLMain.m.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 13 Apr 2008 04:50:17 +0000
parents 4e3b250c950e
children 1238da4a7112
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.TH "SDL_MapRGBA" "3" "Tue 11 Sep 2001, 23:01" "SDL" "SDL API Reference" 
.SH "NAME"
SDL_MapRGBA \- Map a RGBA color value to a pixel format\&.
.SH "SYNOPSIS"
.PP
\fB#include "SDL\&.h"
.sp
\fBUint32 \fBSDL_MapRGBA\fP\fR(\fBSDL_PixelFormat *fmt, Uint8 r, Uint8 g, Uint8 b, Uint8 a\fR);
.SH "DESCRIPTION"
.PP
Maps the RGBA color value to the specified pixel format and returns the pixel value as a 32-bit int\&.
.PP
If the format has a palette (8-bit) the index of the closest matching color in the palette will be returned\&.
.PP
If the specified pixel format has no alpha component the alpha value will be ignored (as it will be in formats with a palette)\&.
.SH "RETURN VALUE"
.PP
A pixel value best approximating the given RGBA color value for a given pixel format\&. If the pixel format bpp (color depth) is less than 32-bpp then the unused upper bits of the return value can safely be ignored (e\&.g\&., with a 16-bpp format the return value can be assigned to a \fBUint16\fP, and similarly a \fBUint8\fP for an 8-bpp format)\&.
.SH "SEE ALSO"
.PP
\fISDL_GetRGB\fR, \fISDL_GetRGBA\fR, \fISDL_MapRGB\fR, \fISDL_PixelFormat\fR
...\" created by instant / docbook-to-man, Tue 11 Sep 2001, 23:01