docs/man3/SDL_MapRGBA.3
author Sam Lantinga <slouken@libsdl.org>
Wed, 08 Mar 2006 18:30:12 +0000
changeset 1486 9d77fc9d0ace
parent 181 e5bc29de3f0a
child 2283 546f7c1eb755
permissions -rw-r--r--
Re-added C runtime support for Visual C++ 5,6
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.TH "SDL_MapRGBA" "3" "Tue 11 Sep 2001, 23:01" "SDL" "SDL API Reference" 
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.SH "NAME"
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SDL_MapRGBA\- Map a RGBA color value to a pixel format\&.
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.SH "SYNOPSIS"
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.PP
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\fB#include "SDL\&.h"
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.sp
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\fBUint32 \fBSDL_MapRGBA\fP\fR(\fBSDL_PixelFormat *fmt, Uint8 r, Uint8 g, Uint8 b, Uint8 a\fR);
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.SH "DESCRIPTION"
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.PP
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Maps the RGBA color value to the specified pixel format and returns the pixel value as a 32-bit int\&.
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.PP
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If the format has a palette (8-bit) the index of the closest matching color in the palette will be returned\&.
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.PP
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If the specified pixel format has no alpha component the alpha value will be ignored (as it will be in formats with a palette)\&.
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.SH "RETURN VALUE"
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.PP
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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)\&.
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.SH "SEE ALSO"
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.PP
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\fISDL_GetRGB\fR, \fISDL_GetRGBA\fR, \fISDL_MapRGB\fR, \fISDL_PixelFormat\fR
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...\" created by instant / docbook-to-man, Tue 11 Sep 2001, 23:01