include/SDL_pixels.h
author Ryan C. Gordon <icculus@icculus.org>
Sun, 10 Jan 2010 05:06:03 +0000
changeset 3623 9a73fecd9181
parent 3555 7549b986ccb1
child 3697 f7b03b6838cb
permissions -rw-r--r--
Reverted r5460 ... this was merged from 1.2, but was later reverted there.
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/*
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    SDL - Simple DirectMedia Layer
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    Copyright (C) 1997-2009 Sam Lantinga
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    This library is free software; you can redistribute it and/or
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    modify it under the terms of the GNU Lesser General Public
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    License as published by the Free Software Foundation; either
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    version 2.1 of the License, or (at your option) any later version.
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    This library is distributed in the hope that it will be useful,
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    but WITHOUT ANY WARRANTY; without even the implied warranty of
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    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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    Lesser General Public License for more details.
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    You should have received a copy of the GNU Lesser General Public
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    License along with this library; if not, write to the Free Software
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    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
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    Sam Lantinga
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    slouken@libsdl.org
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*/
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/**
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 *  \file SDL_pixels.h
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 *  
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 *  Header for the enumerated pixel format definitions.
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 */
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#ifndef _SDL_pixels_h
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#define _SDL_pixels_h
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#include "begin_code.h"
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/* Set up for C function definitions, even when using C++ */
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#ifdef __cplusplus
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/* *INDENT-OFF* */
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extern "C" {
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/* *INDENT-ON* */
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#endif
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/**
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 *  \name Transparency definitions
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 *  
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 *  These define alpha as the opacity of a surface.
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 */
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/*@{*/
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#define SDL_ALPHA_OPAQUE 255
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#define SDL_ALPHA_TRANSPARENT 0
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/*@}*/
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/** Pixel type. */
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enum
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{
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    SDL_PIXELTYPE_UNKNOWN,
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    SDL_PIXELTYPE_INDEX1,
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    SDL_PIXELTYPE_INDEX4,
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    SDL_PIXELTYPE_INDEX8,
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    SDL_PIXELTYPE_PACKED8,
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    SDL_PIXELTYPE_PACKED16,
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    SDL_PIXELTYPE_PACKED32,
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    SDL_PIXELTYPE_ARRAYU8,
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    SDL_PIXELTYPE_ARRAYU16,
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    SDL_PIXELTYPE_ARRAYU32,
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    SDL_PIXELTYPE_ARRAYF16,
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    SDL_PIXELTYPE_ARRAYF32
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};
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/** Bitmap pixel order, high bit -> low bit. */
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enum
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{
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    SDL_BITMAPORDER_NONE,
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    SDL_BITMAPORDER_4321,
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    SDL_BITMAPORDER_1234
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};
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/** Packed component order, high bit -> low bit. */
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enum
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{
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    SDL_PACKEDORDER_NONE,
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    SDL_PACKEDORDER_XRGB,
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    SDL_PACKEDORDER_RGBX,
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    SDL_PACKEDORDER_ARGB,
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    SDL_PACKEDORDER_RGBA,
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    SDL_PACKEDORDER_XBGR,
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    SDL_PACKEDORDER_BGRX,
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    SDL_PACKEDORDER_ABGR,
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    SDL_PACKEDORDER_BGRA
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};
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/** Array component order, low byte -> high byte. */
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enum
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{
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    SDL_ARRAYORDER_NONE,
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    SDL_ARRAYORDER_RGB,
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    SDL_ARRAYORDER_RGBA,
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    SDL_ARRAYORDER_ARGB,
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    SDL_ARRAYORDER_BGR,
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    SDL_ARRAYORDER_BGRA,
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    SDL_ARRAYORDER_ABGR
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};
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/** Packed component layout. */
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enum
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{
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    SDL_PACKEDLAYOUT_NONE,
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    SDL_PACKEDLAYOUT_332,
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    SDL_PACKEDLAYOUT_4444,
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    SDL_PACKEDLAYOUT_1555,
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    SDL_PACKEDLAYOUT_5551,
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    SDL_PACKEDLAYOUT_565,
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    SDL_PACKEDLAYOUT_8888,
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    SDL_PACKEDLAYOUT_2101010,
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    SDL_PACKEDLAYOUT_1010102
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};
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#define SDL_DEFINE_PIXELFOURCC(A, B, C, D) \
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    ((A) | ((B) << 8) | ((C) << 16) | ((D) << 24))
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#define SDL_DEFINE_PIXELFORMAT(type, order, layout, bits, bytes) \
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    ((1 << 31) | ((type) << 24) | ((order) << 20) | ((layout) << 16) | \
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     ((bits) << 8) | ((bytes) << 0))
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#define SDL_PIXELTYPE(X)	(((X) >> 24) & 0x0F)
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#define SDL_PIXELORDER(X)	(((X) >> 20) & 0x0F)
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#define SDL_PIXELLAYOUT(X)	(((X) >> 16) & 0x0F)
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#define SDL_BITSPERPIXEL(X)	(((X) >> 8) & 0xFF)
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#define SDL_BYTESPERPIXEL(X)	(((X) >> 0) & 0xFF)
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#define SDL_ISPIXELFORMAT_INDEXED(format)   \
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    ((SDL_PIXELTYPE(format) == SDL_PIXELTYPE_INDEX1) || \
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     (SDL_PIXELTYPE(format) == SDL_PIXELTYPE_INDEX4) || \
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     (SDL_PIXELTYPE(format) == SDL_PIXELTYPE_INDEX8))
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#define SDL_ISPIXELFORMAT_ALPHA(format)   \
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    ((SDL_PIXELORDER(format) == SDL_PACKEDORDER_ARGB) || \
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     (SDL_PIXELORDER(format) == SDL_PACKEDORDER_RGBA) || \
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     (SDL_PIXELORDER(format) == SDL_PACKEDORDER_ABGR) || \
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     (SDL_PIXELORDER(format) == SDL_PACKEDORDER_BGRA))
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#define SDL_ISPIXELFORMAT_FOURCC(format)    \
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    ((format) && !((format) & 0x80000000))
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enum
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{
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    SDL_PIXELFORMAT_UNKNOWN,
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    SDL_PIXELFORMAT_INDEX1LSB =
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        SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_INDEX1, SDL_BITMAPORDER_1234, 0,
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                               1, 0),
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    SDL_PIXELFORMAT_INDEX1MSB =
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        SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_INDEX1, SDL_BITMAPORDER_4321, 0,
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                               1, 0),
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    SDL_PIXELFORMAT_INDEX4LSB =
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        SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_INDEX4, SDL_BITMAPORDER_1234, 0,
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                               4, 0),
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    SDL_PIXELFORMAT_INDEX4MSB =
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        SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_INDEX4, SDL_BITMAPORDER_4321, 0,
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                               4, 0),
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    SDL_PIXELFORMAT_INDEX8 =
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        SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_INDEX8, 0, 0, 8, 1),
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    SDL_PIXELFORMAT_RGB332 =
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        SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED8, SDL_PACKEDORDER_XRGB,
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                               SDL_PACKEDLAYOUT_332, 8, 1),
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    SDL_PIXELFORMAT_RGB444 =
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        SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED16, SDL_PACKEDORDER_XRGB,
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                               SDL_PACKEDLAYOUT_4444, 12, 2),
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    SDL_PIXELFORMAT_RGB555 =
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        SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED16, SDL_PACKEDORDER_XRGB,
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                               SDL_PACKEDLAYOUT_1555, 15, 2),
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    SDL_PIXELFORMAT_BGR555 =
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        SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED16, SDL_PACKEDORDER_XBGR,
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                               SDL_PACKEDLAYOUT_1555, 15, 2),
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    SDL_PIXELFORMAT_ARGB4444 =
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        SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED16, SDL_PACKEDORDER_ARGB,
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                               SDL_PACKEDLAYOUT_4444, 16, 2),
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    SDL_PIXELFORMAT_ABGR4444 =
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        SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED16, SDL_PACKEDORDER_ABGR,
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                               SDL_PACKEDLAYOUT_4444, 16, 2),
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    SDL_PIXELFORMAT_ARGB1555 =
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        SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED16, SDL_PACKEDORDER_ARGB,
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                               SDL_PACKEDLAYOUT_1555, 16, 2),
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    SDL_PIXELFORMAT_ABGR1555 =
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        SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED16, SDL_PACKEDORDER_ABGR,
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                               SDL_PACKEDLAYOUT_1555, 16, 2),
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    SDL_PIXELFORMAT_RGB565 =
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        SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED16, SDL_PACKEDORDER_XRGB,
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                               SDL_PACKEDLAYOUT_565, 16, 2),
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    SDL_PIXELFORMAT_BGR565 =
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        SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED16, SDL_PACKEDORDER_XBGR,
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                               SDL_PACKEDLAYOUT_565, 16, 2),
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    SDL_PIXELFORMAT_RGB24 =
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        SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_ARRAYU8, SDL_ARRAYORDER_RGB, 0,
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                               24, 3),
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    SDL_PIXELFORMAT_BGR24 =
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        SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_ARRAYU8, SDL_ARRAYORDER_BGR, 0,
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                               24, 3),
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    SDL_PIXELFORMAT_RGB888 =
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        SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED32, SDL_PACKEDORDER_XRGB,
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                               SDL_PACKEDLAYOUT_8888, 24, 4),
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    SDL_PIXELFORMAT_BGR888 =
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        SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED32, SDL_PACKEDORDER_XBGR,
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                               SDL_PACKEDLAYOUT_8888, 24, 4),
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    SDL_PIXELFORMAT_ARGB8888 =
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        SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED32, SDL_PACKEDORDER_ARGB,
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                               SDL_PACKEDLAYOUT_8888, 32, 4),
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    SDL_PIXELFORMAT_RGBA8888 =
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        SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED32, SDL_PACKEDORDER_RGBA,
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                               SDL_PACKEDLAYOUT_8888, 32, 4),
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    SDL_PIXELFORMAT_ABGR8888 =
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        SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED32, SDL_PACKEDORDER_ABGR,
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                               SDL_PACKEDLAYOUT_8888, 32, 4),
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    SDL_PIXELFORMAT_BGRA8888 =
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        SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED32, SDL_PACKEDORDER_BGRA,
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                               SDL_PACKEDLAYOUT_8888, 32, 4),
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    SDL_PIXELFORMAT_ARGB2101010 =
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        SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED32, SDL_PACKEDORDER_ARGB,
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                               SDL_PACKEDLAYOUT_2101010, 32, 4),
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    SDL_PIXELFORMAT_YV12 =      /**< Planar mode: Y + V + U  (3 planes) */
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        SDL_DEFINE_PIXELFOURCC('Y', 'V', '1', '2'),
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    SDL_PIXELFORMAT_IYUV =      /**< Planar mode: Y + U + V  (3 planes) */
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        SDL_DEFINE_PIXELFOURCC('I', 'Y', 'U', 'V'),
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    SDL_PIXELFORMAT_YUY2 =      /**< Packed mode: Y0+U0+Y1+V0 (1 plane) */
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        SDL_DEFINE_PIXELFOURCC('Y', 'U', 'Y', '2'),
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    SDL_PIXELFORMAT_UYVY =      /**< Packed mode: U0+Y0+V0+Y1 (1 plane) */
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        SDL_DEFINE_PIXELFOURCC('U', 'Y', 'V', 'Y'),
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    SDL_PIXELFORMAT_YVYU =      /**< Packed mode: Y0+V0+Y1+U0 (1 plane) */
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        SDL_DEFINE_PIXELFOURCC('Y', 'V', 'Y', 'U')
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};
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typedef struct SDL_Color
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{
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    Uint8 r;
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    Uint8 g;
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    Uint8 b;
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    Uint8 unused;
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} SDL_Color;
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#define SDL_Colour SDL_Color
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typedef struct SDL_Palette SDL_Palette;
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typedef int (*SDL_PaletteChangedFunc) (void *userdata, SDL_Palette * palette);
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typedef struct SDL_PaletteWatch SDL_PaletteWatch;
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struct SDL_Palette
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{
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    int ncolors;
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    SDL_Color *colors;
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    int refcount;
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    SDL_PaletteWatch *watch;
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};
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/**
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 *  \note Everything in the pixel format structure is read-only.
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 */
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typedef struct SDL_PixelFormat
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{
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    SDL_Palette *palette;
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    Uint8 BitsPerPixel;
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    Uint8 BytesPerPixel;
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    Uint8 Rloss;
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    Uint8 Gloss;
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    Uint8 Bloss;
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    Uint8 Aloss;
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    Uint8 Rshift;
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    Uint8 Gshift;
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    Uint8 Bshift;
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    Uint8 Ashift;
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    Uint32 Rmask;
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    Uint32 Gmask;
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    Uint32 Bmask;
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    Uint32 Amask;
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} SDL_PixelFormat;
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/**
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 *  \brief Convert one of the enumerated pixel formats to a bpp and RGBA masks.
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 *  
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 *  \return SDL_TRUE, or SDL_FALSE if the conversion wasn't possible.
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 *  
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 *  \sa SDL_MasksToPixelFormatEnum()
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 */
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extern DECLSPEC SDL_bool SDLCALL SDL_PixelFormatEnumToMasks(Uint32 format,
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                                                            int *bpp,
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                                                            Uint32 * Rmask,
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                                                            Uint32 * Gmask,
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                                                            Uint32 * Bmask,
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                                                            Uint32 * Amask);
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/**
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 *  \brief Convert a bpp and RGBA masks to an enumerated pixel format.
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 *  
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 *  \return The pixel format, or ::SDL_PIXELFORMAT_UNKNOWN if the conversion 
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 *          wasn't possible.
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 *  
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 *  \sa SDL_PixelFormatEnumToMasks()
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 */
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extern DECLSPEC Uint32 SDLCALL SDL_MasksToPixelFormatEnum(int bpp,
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                                                          Uint32 Rmask,
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                                                          Uint32 Gmask,
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                                                          Uint32 Bmask,
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                                                          Uint32 Amask);
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/**
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 *  \brief Create a palette structure with the specified number of color 
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 *         entries.
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 *  
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 *  \return A new palette, or NULL if there wasn't enough memory.
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 *  
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 *  \note The palette entries are initialized to white.
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 *  
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 *  \sa SDL_FreePalette()
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 */
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extern DECLSPEC SDL_Palette *SDLCALL SDL_AllocPalette(int ncolors);
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/**
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 *  \brief Add a callback function which is called when the palette changes.
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 *  
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 *  \sa SDL_DelPaletteWatch()
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 */
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extern DECLSPEC int SDLCALL SDL_AddPaletteWatch(SDL_Palette * palette,
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                                                SDL_PaletteChangedFunc
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                                                callback, void *userdata);
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/**
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 *  \brief Remove a callback function previously added with 
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 *         SDL_AddPaletteWatch().
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 *  
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 *  \sa SDL_AddPaletteWatch()
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 */
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extern DECLSPEC void SDLCALL SDL_DelPaletteWatch(SDL_Palette * palette,
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                                                 SDL_PaletteChangedFunc
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                                                 callback, void *userdata);
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/**
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 *  \brief Set a range of colors in a palette.
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 *  
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 *  \param palette    The palette to modify.
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 *  \param colors     An array of colors to copy into the palette.
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 *  \param firstcolor The index of the first palette entry to modify.
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 *  \param ncolors    The number of entries to modify.
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 *  
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 *  \return 0 on success, or -1 if not all of the colors could be set.
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 */
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extern DECLSPEC int SDLCALL SDL_SetPaletteColors(SDL_Palette * palette,
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                                                 const SDL_Color * colors,
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                                                 int firstcolor, int ncolors);
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/**
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 *  \brief Free a palette created with SDL_AllocPalette().
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 *  
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 *  \sa SDL_AllocPalette()
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 */
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extern DECLSPEC void SDLCALL SDL_FreePalette(SDL_Palette * palette);
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/**
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 *  \brief Maps an RGB triple to an opaque pixel value for a given pixel format.
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 *  
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 *  \sa SDL_MapRGBA
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 */
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extern DECLSPEC Uint32 SDLCALL SDL_MapRGB(const SDL_PixelFormat * format,
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                                          Uint8 r, Uint8 g, Uint8 b);
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/**
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 *  \brief Maps an RGBA quadruple to a pixel value for a given pixel format.
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 *  
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 *  \sa SDL_MapRGB
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 */
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extern DECLSPEC Uint32 SDLCALL SDL_MapRGBA(const SDL_PixelFormat * format,
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                                           Uint8 r, Uint8 g, Uint8 b,
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                                           Uint8 a);
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/**
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 *  \brief Get the RGB components from a pixel of the specified format.
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 *  
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 *  \sa SDL_GetRGBA
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 */
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extern DECLSPEC void SDLCALL SDL_GetRGB(Uint32 pixel,
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                                        const SDL_PixelFormat * format,
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                                        Uint8 * r, Uint8 * g, Uint8 * b);
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/**
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 *  \brief Get the RGBA components from a pixel of the specified format.
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 *  
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 *  \sa SDL_GetRGB
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 */
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extern DECLSPEC void SDLCALL SDL_GetRGBA(Uint32 pixel,
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                                         const SDL_PixelFormat * format,
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                                         Uint8 * r, Uint8 * g, Uint8 * b,
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                                         Uint8 * a);
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/* Ends C function definitions when using C++ */
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#ifdef __cplusplus
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/* *INDENT-OFF* */
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}
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/* *INDENT-ON* */
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#endif
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#include "close_code.h"
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#endif /* _SDL_pixels_h */
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/* vi: set ts=4 sw=4 expandtab: */