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annotate include/SDL_pixels.h @ 2806:938aa47f903a

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Fixed testalpha screen clear for screen formats with an alpha channel
author Sam Lantinga <slouken@libsdl.org>
date Sat, 29 Nov 2008 11:24:18 +0000
parents 204be4fc2726
children 99210400e8b9
rev   line source
1895
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Lesser General Public
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7 License as published by the Free Software Foundation; either
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8 version 2.1 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Lesser General Public License for more details.
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14
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15 You should have received a copy of the GNU Lesser General Public
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22
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23 /**
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24 * \file SDL_pixels.h
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25 *
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26 * Header for the enumerated pixel format definitions
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27 */
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28
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29 #ifndef _SDL_pixels_h
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30 #define _SDL_pixels_h
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31
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32 #include "begin_code.h"
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33 /* Set up for C function definitions, even when using C++ */
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34 #ifdef __cplusplus
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35 /* *INDENT-OFF* */
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36 extern "C" {
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37 /* *INDENT-ON* */
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38 #endif
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39
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40 /* Transparency definitions: These define alpha as the opacity of a surface */
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41 #define SDL_ALPHA_OPAQUE 255
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42 #define SDL_ALPHA_TRANSPARENT 0
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43
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44 enum
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45 { /* Pixel type */
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46 SDL_PIXELTYPE_UNKNOWN,
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47 SDL_PIXELTYPE_INDEX1,
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48 SDL_PIXELTYPE_INDEX4,
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49 SDL_PIXELTYPE_INDEX8,
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50 SDL_PIXELTYPE_PACKED8,
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51 SDL_PIXELTYPE_PACKED16,
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52 SDL_PIXELTYPE_PACKED32,
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53 SDL_PIXELTYPE_ARRAYU8,
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54 SDL_PIXELTYPE_ARRAYU16,
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55 SDL_PIXELTYPE_ARRAYU32,
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56 SDL_PIXELTYPE_ARRAYF16,
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57 SDL_PIXELTYPE_ARRAYF32
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58 };
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59
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60 enum
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61 { /* bitmap pixel order, high bit -> low bit */
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62 SDL_BITMAPORDER_NONE,
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63 SDL_BITMAPORDER_4321,
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64 SDL_BITMAPORDER_1234
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65 };
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66 enum
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67 { /* packed component order, high bit -> low bit */
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68 SDL_PACKEDORDER_NONE,
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69 SDL_PACKEDORDER_XRGB,
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70 SDL_PACKEDORDER_RGBX,
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71 SDL_PACKEDORDER_ARGB,
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72 SDL_PACKEDORDER_RGBA,
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73 SDL_PACKEDORDER_XBGR,
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74 SDL_PACKEDORDER_BGRX,
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75 SDL_PACKEDORDER_ABGR,
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76 SDL_PACKEDORDER_BGRA
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77 };
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78 enum
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79 { /* array component order, low byte -> high byte */
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80 SDL_ARRAYORDER_NONE,
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81 SDL_ARRAYORDER_RGB,
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82 SDL_ARRAYORDER_RGBA,
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83 SDL_ARRAYORDER_ARGB,
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84 SDL_ARRAYORDER_BGR,
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85 SDL_ARRAYORDER_BGRA,
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86 SDL_ARRAYORDER_ABGR
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87 };
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88
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89 enum
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90 { /* Packed component layout */
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91 SDL_PACKEDLAYOUT_NONE,
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92 SDL_PACKEDLAYOUT_332,
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93 SDL_PACKEDLAYOUT_4444,
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94 SDL_PACKEDLAYOUT_1555,
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95 SDL_PACKEDLAYOUT_5551,
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96 SDL_PACKEDLAYOUT_565,
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97 SDL_PACKEDLAYOUT_8888,
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98 SDL_PACKEDLAYOUT_2101010,
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99 SDL_PACKEDLAYOUT_1010102
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100 };
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101
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102 #define SDL_DEFINE_PIXELFOURCC(A, B, C, D) \
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103 ((A) | ((B) << 8) | ((C) << 16) | ((D) << 24))
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104
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105 #define SDL_DEFINE_PIXELFORMAT(type, order, layout, bits, bytes) \
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106 ((1 << 31) | ((type) << 24) | ((order) << 20) | ((layout) << 16) | \
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107 ((bits) << 8) | ((bytes) << 0))
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108
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109 #define SDL_PIXELTYPE(X) (((X) >> 24) & 0x0F)
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110 #define SDL_PIXELORDER(X) (((X) >> 20) & 0x0F)
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111 #define SDL_PIXELLAYOUT(X) (((X) >> 16) & 0x0F)
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112 #define SDL_BITSPERPIXEL(X) (((X) >> 8) & 0xFF)
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113 #define SDL_BYTESPERPIXEL(X) (((X) >> 0) & 0xFF)
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114
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115 #define SDL_ISPIXELFORMAT_INDEXED(format) \
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116 ((SDL_PIXELTYPE(format) == SDL_PIXELTYPE_INDEX1) || \
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117 (SDL_PIXELTYPE(format) == SDL_PIXELTYPE_INDEX4) || \
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118 (SDL_PIXELTYPE(format) == SDL_PIXELTYPE_INDEX8))
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119
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120 #define SDL_ISPIXELFORMAT_FOURCC(format) \
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121 ((format) && !((format) & 0x80000000))
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122
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123 enum
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124 {
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125 SDL_PIXELFORMAT_UNKNOWN,
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126 SDL_PIXELFORMAT_INDEX1LSB =
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127 SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_INDEX1, SDL_BITMAPORDER_1234, 0,
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128 1, 0),
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129 SDL_PIXELFORMAT_INDEX1MSB =
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130 SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_INDEX1, SDL_BITMAPORDER_4321, 0,
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131 1, 0),
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132 SDL_PIXELFORMAT_INDEX4LSB =
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133 SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_INDEX4, SDL_BITMAPORDER_1234, 0,
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134 2, 0),
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135 SDL_PIXELFORMAT_INDEX4MSB =
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136 SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_INDEX4, SDL_BITMAPORDER_4321, 0,
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137 2, 0),
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138 SDL_PIXELFORMAT_INDEX8 =
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139 SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_INDEX8, 0, 0, 8, 1),
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140 SDL_PIXELFORMAT_RGB332 =
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141 SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED8, SDL_PACKEDORDER_XRGB,
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142 SDL_PACKEDLAYOUT_332, 8, 1),
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143 SDL_PIXELFORMAT_RGB444 =
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144 SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED16, SDL_PACKEDORDER_XRGB,
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145 SDL_PACKEDLAYOUT_4444, 12, 2),
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146 SDL_PIXELFORMAT_RGB555 =
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147 SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED16, SDL_PACKEDORDER_XRGB,
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148 SDL_PACKEDLAYOUT_1555, 15, 2),
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149 SDL_PIXELFORMAT_BGR555 =
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150 SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED16, SDL_PACKEDORDER_XBGR,
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151 SDL_PACKEDLAYOUT_1555, 15, 2),
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152 SDL_PIXELFORMAT_ARGB4444 =
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153 SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED16, SDL_PACKEDORDER_ARGB,
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154 SDL_PACKEDLAYOUT_4444, 16, 2),
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155 SDL_PIXELFORMAT_ARGB1555 =
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156 SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED16, SDL_PACKEDORDER_ARGB,
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157 SDL_PACKEDLAYOUT_1555, 16, 2),
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158 SDL_PIXELFORMAT_ABGR1555 =
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159 SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED16, SDL_PACKEDORDER_ABGR,
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160 SDL_PACKEDLAYOUT_1555, 16, 2),
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161 SDL_PIXELFORMAT_RGB565 =
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diff changeset
162 SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED16, SDL_PACKEDORDER_XRGB,
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diff changeset
163 SDL_PACKEDLAYOUT_565, 16, 2),
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164 SDL_PIXELFORMAT_RGB24 =
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165 SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_ARRAYU8, SDL_ARRAYORDER_RGB, 0,
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166 24, 3),
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167 SDL_PIXELFORMAT_BGR24 =
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diff changeset
168 SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_ARRAYU8, SDL_ARRAYORDER_BGR, 0,
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169 24, 3),
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170 SDL_PIXELFORMAT_RGB888 =
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diff changeset
171 SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED32, SDL_PACKEDORDER_XRGB,
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diff changeset
172 SDL_PACKEDLAYOUT_8888, 24, 4),
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173 SDL_PIXELFORMAT_BGR888 =
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diff changeset
174 SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED32, SDL_PACKEDORDER_XBGR,
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diff changeset
175 SDL_PACKEDLAYOUT_8888, 24, 4),
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diff changeset
176 SDL_PIXELFORMAT_ARGB8888 =
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diff changeset
177 SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED32, SDL_PACKEDORDER_ARGB,
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178 SDL_PACKEDLAYOUT_8888, 32, 4),
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179 SDL_PIXELFORMAT_RGBA8888 =
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diff changeset
180 SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED32, SDL_PACKEDORDER_RGBA,
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diff changeset
181 SDL_PACKEDLAYOUT_8888, 32, 4),
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diff changeset
182 SDL_PIXELFORMAT_ABGR8888 =
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diff changeset
183 SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED32, SDL_PACKEDORDER_ABGR,
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diff changeset
184 SDL_PACKEDLAYOUT_8888, 32, 4),
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185 SDL_PIXELFORMAT_BGRA8888 =
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diff changeset
186 SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED32, SDL_PACKEDORDER_BGRA,
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diff changeset
187 SDL_PACKEDLAYOUT_8888, 32, 4),
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diff changeset
188 SDL_PIXELFORMAT_ARGB2101010 =
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diff changeset
189 SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED32, SDL_PACKEDORDER_ARGB,
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diff changeset
190 SDL_PACKEDLAYOUT_2101010, 32, 4),
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191
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diff changeset
192 SDL_PIXELFORMAT_YV12 = /* Planar mode: Y + V + U (3 planes) */
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193 SDL_DEFINE_PIXELFOURCC('Y', 'V', '1', '2'),
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194 SDL_PIXELFORMAT_IYUV = /* Planar mode: Y + U + V (3 planes) */
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195 SDL_DEFINE_PIXELFOURCC('I', 'Y', 'U', 'V'),
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196 SDL_PIXELFORMAT_YUY2 = /* Packed mode: Y0+U0+Y1+V0 (1 plane) */
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197 SDL_DEFINE_PIXELFOURCC('Y', 'U', 'Y', '2'),
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198 SDL_PIXELFORMAT_UYVY = /* Packed mode: U0+Y0+V0+Y1 (1 plane) */
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199 SDL_DEFINE_PIXELFOURCC('U', 'Y', 'V', 'Y'),
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200 SDL_PIXELFORMAT_YVYU = /* Packed mode: Y0+V0+Y1+U0 (1 plane) */
2208
b03710fb0333 Fixed bug #467
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201 SDL_DEFINE_PIXELFOURCC('Y', 'V', 'Y', 'U')
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202 };
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203
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204 typedef struct SDL_Color
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205 {
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206 Uint8 r;
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diff changeset
207 Uint8 g;
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diff changeset
208 Uint8 b;
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209 Uint8 unused;
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210 } SDL_Color;
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211 #define SDL_Colour SDL_Color
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212
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213 typedef struct SDL_Palette SDL_Palette;
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214 typedef int (*SDL_PaletteChangedFunc) (void *userdata, SDL_Palette * palette);
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215
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216 typedef struct SDL_PaletteWatch
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217 {
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218 SDL_PaletteChangedFunc callback;
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219 void *userdata;
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220 struct SDL_PaletteWatch *next;
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221 } SDL_PaletteWatch;
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diff changeset
222
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223 struct SDL_Palette
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224 {
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225 int ncolors;
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226 SDL_Color *colors;
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227
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228 int refcount;
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229 SDL_PaletteWatch *watch;
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230 };
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231
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232 /* Everything in the pixel format structure is read-only */
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233 typedef struct SDL_PixelFormat
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234 {
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235 SDL_Palette *palette;
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236 Uint8 BitsPerPixel;
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237 Uint8 BytesPerPixel;
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diff changeset
238 Uint8 Rloss;
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diff changeset
239 Uint8 Gloss;
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diff changeset
240 Uint8 Bloss;
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diff changeset
241 Uint8 Aloss;
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parents:
diff changeset
242 Uint8 Rshift;
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diff changeset
243 Uint8 Gshift;
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244 Uint8 Bshift;
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245 Uint8 Ashift;
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246 Uint32 Rmask;
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diff changeset
247 Uint32 Gmask;
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248 Uint32 Bmask;
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249 Uint32 Amask;
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250 } SDL_PixelFormat;
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251
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diff changeset
252 /**
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253 * \fn SDL_bool SDL_PixelFormatEnumToMasks(Uint32 format, int *bpp, Uint32 * Rmask, Uint32 * Gmask, Uint32 * Bmask, Uint32 * Amask)
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254 *
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255 * \brief Convert one of the enumerated pixel formats to a bpp and RGBA masks.
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256 *
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257 * \return SDL_TRUE, or SDL_FALSE if the conversion wasn't possible.
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258 *
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259 * \sa SDL_MasksToPixelFormatEnum()
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260 */
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261 extern DECLSPEC SDL_bool SDLCALL SDL_PixelFormatEnumToMasks(Uint32 format,
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262 int *bpp,
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263 Uint32 * Rmask,
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264 Uint32 * Gmask,
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265 Uint32 * Bmask,
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266 Uint32 * Amask);
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267
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268 /**
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269 * \fn Uint32 SDL_MasksToPixelFormatEnum(int bpp, Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask)
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270 *
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271 * \brief Convert a bpp and RGBA masks to an enumerated pixel format.
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272 *
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273 * \return The pixel format, or SDL_PixelFormat_Unknown if the conversion wasn't possible.
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274 *
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275 * \sa SDL_PixelFormatEnumToMasks()
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276 */
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277 extern DECLSPEC Uint32 SDLCALL SDL_MasksToPixelFormatEnum(int bpp,
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278 Uint32 Rmask,
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279 Uint32 Gmask,
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280 Uint32 Bmask,
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281 Uint32 Amask);
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282
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283 /**
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284 * \fn SDL_Palette *SDL_AllocPalette(int ncolors)
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285 *
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286 * \brief Create a palette structure with the specified number of color entries.
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287 *
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288 * \return A new palette, or NULL if there wasn't enough memory
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289 *
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290 * \note The palette entries are initialized to white.
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291 *
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292 * \sa SDL_FreePalette()
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293 */
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294 extern DECLSPEC SDL_Palette *SDLCALL SDL_AllocPalette(int ncolors);
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295
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296 /**
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297 * \fn int SDL_AddPaletteWatch(SDL_Palette *palette, SDL_PaletteChangedFunc callback, void *userdata)
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298 *
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299 * \brief Add a callback function which is called when the palette changes.
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300 *
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301 * \sa SDL_DelPaletteWatch()
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302 */
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303 extern DECLSPEC int SDLCALL SDL_AddPaletteWatch(SDL_Palette * palette,
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304 SDL_PaletteChangedFunc
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305 callback, void *userdata);
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306
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307 /**
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308 * \fn void SDL_DelPaletteWatch(SDL_Palette *palette, SDL_PaletteChangedFunc callback, void *userdata)
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309 *
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310 * \brief Remove a callback function previously added with SDL_AddPaletteWatch()
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311 *
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312 * \sa SDL_AddPaletteWatch()
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313 */
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314 extern DECLSPEC void SDLCALL SDL_DelPaletteWatch(SDL_Palette * palette,
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315 SDL_PaletteChangedFunc
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316 callback, void *userdata);
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317
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318 /**
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319 * \fn int SDL_SetPaletteColors(SDL_Palette *palette, const SDL_Colors *colors, int firstcolor, int numcolors)
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320 *
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321 * \brief Set a range of colors in a palette.
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322 *
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323 * \param palette The palette to modify
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324 * \param colors An array of colors to copy into the palette
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325 * \param firstcolor The index of the first palette entry to modify
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326 * \param ncolors The number of entries to modify
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327 *
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328 * \return 0 on success, or -1 if not all of the colors could be set
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329 */
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330 extern DECLSPEC int SDLCALL SDL_SetPaletteColors(SDL_Palette * palette,
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331 const SDL_Color * colors,
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332 int firstcolor, int ncolors);
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333
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334 /**
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335 * \fn void SDL_FreePalette(SDL_Palette *palette)
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336 *
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337 * \brief Free a palette created with SDL_AllocPalette()
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338 *
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339 * \sa SDL_AllocPalette()
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340 */
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341 extern DECLSPEC void SDLCALL SDL_FreePalette(SDL_Palette * palette);
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342
2275
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343 /**
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344 * \fn Uint32 SDL_MapRGB(const SDL_PixelFormat *format,
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345 * Uint8 r, Uint8 g, Uint8 b)
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346 *
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347 * \brief Maps an RGB triple to an opaque pixel value for a given pixel format
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348 *
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349 * \sa SDL_MapRGBA
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350 */
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351 extern DECLSPEC Uint32 SDLCALL SDL_MapRGB(const SDL_PixelFormat * format,
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352 Uint8 r, Uint8 g, Uint8 b);
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353
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354 /**
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355 * \fn Uint32 SDL_MapRGBA(const SDL_PixelFormat *fmt,
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356 * Uint8 r, Uint8 g, Uint8 b, Uint8 a)
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357 *
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358 * \brief Maps an RGBA quadruple to a pixel value for a given pixel format
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359 *
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360 * \sa SDL_MapRGB
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361 */
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362 extern DECLSPEC Uint32 SDLCALL SDL_MapRGBA(const SDL_PixelFormat * format,
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363 Uint8 r, Uint8 g, Uint8 b,
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364 Uint8 a);
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365
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366 /**
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367 * \fn void SDL_GetRGB(Uint32 pixel, const SDL_PixelFormat * format,
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368 * Uint8 * r, Uint8 * g, Uint8 * b)
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369 *
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370 * \brief Maps a pixel value into the RGB components for a given pixel format
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371 *
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372 * \sa SDL_GetRGBA
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373 */
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374 extern DECLSPEC void SDLCALL SDL_GetRGB(Uint32 pixel,
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375 const SDL_PixelFormat * format,
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376 Uint8 * r, Uint8 * g, Uint8 * b);
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377
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378 /**
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379 * \fn void SDL_GetRGBA(Uint32 pixel, const SDL_PixelFormat * format,
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380 * Uint8 * r, Uint8 * g, Uint8 * b, Uint8 * a)
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381 *
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382 * \brief Maps a pixel value into the RGBA components for a given pixel format
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383 *
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384 * \sa SDL_GetRGB
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385 */
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386 extern DECLSPEC void SDLCALL SDL_GetRGBA(Uint32 pixel,
12ea0fdc0df2 Split out the SDL_rect and SDL_surface functions into their own headers.
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387 const SDL_PixelFormat * format,
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388 Uint8 * r, Uint8 * g, Uint8 * b,
12ea0fdc0df2 Split out the SDL_rect and SDL_surface functions into their own headers.
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389 Uint8 * a);
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390
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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391 /* Ends C function definitions when using C++ */
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392 #ifdef __cplusplus
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393 /* *INDENT-OFF* */
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394 }
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395 /* *INDENT-ON* */
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396 #endif
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397 #include "close_code.h"
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398
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399 #endif /* _SDL_pixels_h */
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400
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401 /* vi: set ts=4 sw=4 expandtab: */