annotate src/video/SDL_blit_1.c @ 1684:c4aa1a2f48f1 SDL-1.3

Software YUV texture support in progress...
author Sam Lantinga <slouken@libsdl.org>
date Sun, 18 Jun 2006 06:35:41 +0000
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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 #include "SDL_config.h"
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23
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24 #include "SDL_video.h"
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25 #include "SDL_blit.h"
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26 #include "SDL_sysvideo.h"
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27 #include "SDL_endian.h"
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28
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29 /* Functions to blit from 8-bit surfaces to other surfaces */
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30
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31 static void
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32 Blit1to1(SDL_BlitInfo * info)
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33 {
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34 #ifndef USE_DUFFS_LOOP
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35 int c;
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36 #endif
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37 int width, height;
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38 Uint8 *src, *map, *dst;
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39 int srcskip, dstskip;
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40
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41 /* Set up some basic variables */
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42 width = info->d_width;
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43 height = info->d_height;
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44 src = info->s_pixels;
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45 srcskip = info->s_skip;
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46 dst = info->d_pixels;
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47 dstskip = info->d_skip;
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48 map = info->table;
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49
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50 while (height--) {
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51 #ifdef USE_DUFFS_LOOP
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52 /* *INDENT-OFF* */
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53 DUFFS_LOOP(
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54 {
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55 *dst = map[*src];
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56 }
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57 dst++;
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58 src++;
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59 , width);
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60 /* *INDENT-ON* */
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61 #else
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62 for (c = width; c; --c) {
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63 *dst = map[*src];
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64 dst++;
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65 src++;
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66 }
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67 #endif
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68 src += srcskip;
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69 dst += dstskip;
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70 }
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71 }
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72
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73 /* This is now endian dependent */
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74 #if ( SDL_BYTEORDER == SDL_LIL_ENDIAN )
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75 #define HI 1
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76 #define LO 0
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77 #else /* ( SDL_BYTEORDER == SDL_BIG_ENDIAN ) */
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78 #define HI 0
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79 #define LO 1
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80 #endif
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81 static void
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82 Blit1to2(SDL_BlitInfo * info)
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83 {
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84 #ifndef USE_DUFFS_LOOP
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85 int c;
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86 #endif
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87 int width, height;
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88 Uint8 *src, *dst;
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89 Uint16 *map;
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90 int srcskip, dstskip;
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91
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92 /* Set up some basic variables */
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93 width = info->d_width;
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94 height = info->d_height;
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95 src = info->s_pixels;
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96 srcskip = info->s_skip;
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97 dst = info->d_pixels;
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98 dstskip = info->d_skip;
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99 map = (Uint16 *) info->table;
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100
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101 #ifdef USE_DUFFS_LOOP
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102 while (height--) {
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103 /* *INDENT-OFF* */
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104 DUFFS_LOOP(
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105 {
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106 *(Uint16 *)dst = map[*src++];
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107 dst += 2;
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108 },
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109 width);
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110 /* *INDENT-ON* */
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111 src += srcskip;
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112 dst += dstskip;
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113 }
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114 #else
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115 /* Memory align at 4-byte boundary, if necessary */
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116 if ((long) dst & 0x03) {
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117 /* Don't do anything if width is 0 */
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118 if (width == 0) {
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119 return;
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120 }
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121 --width;
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122
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123 while (height--) {
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124 /* Perform copy alignment */
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125 *(Uint16 *) dst = map[*src++];
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126 dst += 2;
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127
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128 /* Copy in 4 pixel chunks */
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129 for (c = width / 4; c; --c) {
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130 *(Uint32 *) dst = (map[src[HI]] << 16) | (map[src[LO]]);
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131 src += 2;
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132 dst += 4;
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133 *(Uint32 *) dst = (map[src[HI]] << 16) | (map[src[LO]]);
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134 src += 2;
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135 dst += 4;
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136 }
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137 /* Get any leftovers */
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138 switch (width & 3) {
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139 case 3:
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140 *(Uint16 *) dst = map[*src++];
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141 dst += 2;
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142 case 2:
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143 *(Uint32 *) dst = (map[src[HI]] << 16) | (map[src[LO]]);
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144 src += 2;
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145 dst += 4;
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146 break;
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147 case 1:
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148 *(Uint16 *) dst = map[*src++];
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149 dst += 2;
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150 break;
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151 }
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152 src += srcskip;
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153 dst += dstskip;
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154 }
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155 } else {
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156 while (height--) {
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157 /* Copy in 4 pixel chunks */
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158 for (c = width / 4; c; --c) {
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159 *(Uint32 *) dst = (map[src[HI]] << 16) | (map[src[LO]]);
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160 src += 2;
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161 dst += 4;
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162 *(Uint32 *) dst = (map[src[HI]] << 16) | (map[src[LO]]);
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163 src += 2;
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164 dst += 4;
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165 }
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166 /* Get any leftovers */
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167 switch (width & 3) {
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168 case 3:
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169 *(Uint16 *) dst = map[*src++];
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170 dst += 2;
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171 case 2:
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172 *(Uint32 *) dst = (map[src[HI]] << 16) | (map[src[LO]]);
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173 src += 2;
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174 dst += 4;
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175 break;
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176 case 1:
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177 *(Uint16 *) dst = map[*src++];
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178 dst += 2;
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179 break;
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180 }
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181 src += srcskip;
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182 dst += dstskip;
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183 }
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184 }
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185 #endif /* USE_DUFFS_LOOP */
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186 }
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187 static void
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188 Blit1to3(SDL_BlitInfo * info)
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189 {
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190 #ifndef USE_DUFFS_LOOP
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191 int c;
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192 #endif
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193 int o;
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194 int width, height;
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195 Uint8 *src, *map, *dst;
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196 int srcskip, dstskip;
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197
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198 /* Set up some basic variables */
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199 width = info->d_width;
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200 height = info->d_height;
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201 src = info->s_pixels;
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202 srcskip = info->s_skip;
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203 dst = info->d_pixels;
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204 dstskip = info->d_skip;
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205 map = info->table;
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206
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207 while (height--) {
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208 #ifdef USE_DUFFS_LOOP
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209 /* *INDENT-OFF* */
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210 DUFFS_LOOP(
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211 {
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212 o = *src * 4;
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213 dst[0] = map[o++];
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214 dst[1] = map[o++];
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215 dst[2] = map[o++];
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216 }
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217 src++;
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218 dst += 3;
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219 , width);
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220 /* *INDENT-ON* */
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221 #else
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222 for (c = width; c; --c) {
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223 o = *src * 4;
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224 dst[0] = map[o++];
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225 dst[1] = map[o++];
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226 dst[2] = map[o++];
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227 src++;
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228 dst += 3;
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229 }
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230 #endif /* USE_DUFFS_LOOP */
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231 src += srcskip;
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232 dst += dstskip;
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233 }
0
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234 }
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235 static void
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236 Blit1to4(SDL_BlitInfo * info)
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237 {
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diff changeset
238 #ifndef USE_DUFFS_LOOP
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239 int c;
0
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240 #endif
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241 int width, height;
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242 Uint8 *src;
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243 Uint32 *map, *dst;
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244 int srcskip, dstskip;
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245
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246 /* Set up some basic variables */
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247 width = info->d_width;
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248 height = info->d_height;
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249 src = info->s_pixels;
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250 srcskip = info->s_skip;
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251 dst = (Uint32 *) info->d_pixels;
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252 dstskip = info->d_skip / 4;
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253 map = (Uint32 *) info->table;
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254
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255 while (height--) {
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256 #ifdef USE_DUFFS_LOOP
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257 /* *INDENT-OFF* */
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258 DUFFS_LOOP(
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259 *dst++ = map[*src++];
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260 , width);
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261 /* *INDENT-ON* */
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262 #else
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263 for (c = width / 4; c; --c) {
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264 *dst++ = map[*src++];
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265 *dst++ = map[*src++];
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266 *dst++ = map[*src++];
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267 *dst++ = map[*src++];
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268 }
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269 switch (width & 3) {
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270 case 3:
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271 *dst++ = map[*src++];
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272 case 2:
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273 *dst++ = map[*src++];
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274 case 1:
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275 *dst++ = map[*src++];
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276 }
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277 #endif /* USE_DUFFS_LOOP */
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278 src += srcskip;
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279 dst += dstskip;
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280 }
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281 }
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282
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283 static void
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284 Blit1to1Key(SDL_BlitInfo * info)
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285 {
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286 int width = info->d_width;
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287 int height = info->d_height;
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288 Uint8 *src = info->s_pixels;
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289 int srcskip = info->s_skip;
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290 Uint8 *dst = info->d_pixels;
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291 int dstskip = info->d_skip;
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292 Uint8 *palmap = info->table;
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293 Uint32 ckey = info->src->colorkey;
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294
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295 if (palmap) {
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296 while (height--) {
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297 /* *INDENT-OFF* */
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298 DUFFS_LOOP(
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299 {
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300 if ( *src != ckey ) {
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301 *dst = palmap[*src];
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302 }
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303 dst++;
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304 src++;
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305 },
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306 width);
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307 /* *INDENT-ON* */
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308 src += srcskip;
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309 dst += dstskip;
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310 }
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311 } else {
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312 while (height--) {
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313 /* *INDENT-OFF* */
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314 DUFFS_LOOP(
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315 {
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316 if ( *src != ckey ) {
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317 *dst = *src;
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318 }
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319 dst++;
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320 src++;
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321 },
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322 width);
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323 /* *INDENT-ON* */
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324 src += srcskip;
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325 dst += dstskip;
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326 }
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327 }
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328 }
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329
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330 static void
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331 Blit1to2Key(SDL_BlitInfo * info)
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332 {
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333 int width = info->d_width;
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334 int height = info->d_height;
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335 Uint8 *src = info->s_pixels;
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336 int srcskip = info->s_skip;
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337 Uint16 *dstp = (Uint16 *) info->d_pixels;
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338 int dstskip = info->d_skip;
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339 Uint16 *palmap = (Uint16 *) info->table;
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340 Uint32 ckey = info->src->colorkey;
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341
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342 /* Set up some basic variables */
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343 dstskip /= 2;
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344
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345 while (height--) {
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346 /* *INDENT-OFF* */
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347 DUFFS_LOOP(
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348 {
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349 if ( *src != ckey ) {
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350 *dstp=palmap[*src];
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351 }
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352 src++;
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353 dstp++;
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354 },
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355 width);
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356 /* *INDENT-ON* */
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357 src += srcskip;
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358 dstp += dstskip;
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359 }
0
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360 }
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361
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362 static void
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363 Blit1to3Key(SDL_BlitInfo * info)
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364 {
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365 int width = info->d_width;
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366 int height = info->d_height;
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367 Uint8 *src = info->s_pixels;
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368 int srcskip = info->s_skip;
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369 Uint8 *dst = info->d_pixels;
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370 int dstskip = info->d_skip;
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371 Uint8 *palmap = info->table;
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372 Uint32 ckey = info->src->colorkey;
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373 int o;
0
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374
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375 while (height--) {
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376 /* *INDENT-OFF* */
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377 DUFFS_LOOP(
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378 {
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379 if ( *src != ckey ) {
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380 o = *src * 4;
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381 dst[0] = palmap[o++];
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382 dst[1] = palmap[o++];
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383 dst[2] = palmap[o++];
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384 }
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385 src++;
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386 dst += 3;
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387 },
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388 width);
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389 /* *INDENT-ON* */
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390 src += srcskip;
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391 dst += dstskip;
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392 }
0
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393 }
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394
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395 static void
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396 Blit1to4Key(SDL_BlitInfo * info)
0
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diff changeset
397 {
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diff changeset
398 int width = info->d_width;
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399 int height = info->d_height;
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400 Uint8 *src = info->s_pixels;
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401 int srcskip = info->s_skip;
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402 Uint32 *dstp = (Uint32 *) info->d_pixels;
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403 int dstskip = info->d_skip;
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404 Uint32 *palmap = (Uint32 *) info->table;
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405 Uint32 ckey = info->src->colorkey;
0
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406
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407 /* Set up some basic variables */
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408 dstskip /= 4;
0
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409
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410 while (height--) {
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411 /* *INDENT-OFF* */
0
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diff changeset
412 DUFFS_LOOP(
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413 {
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414 if ( *src != ckey ) {
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415 *dstp = palmap[*src];
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416 }
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417 src++;
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418 dstp++;
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419 },
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420 width);
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421 /* *INDENT-ON* */
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422 src += srcskip;
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423 dstp += dstskip;
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424 }
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425 }
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426
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427 static void
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428 Blit1toNAlpha(SDL_BlitInfo * info)
0
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429 {
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430 int width = info->d_width;
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431 int height = info->d_height;
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432 Uint8 *src = info->s_pixels;
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433 int srcskip = info->s_skip;
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434 Uint8 *dst = info->d_pixels;
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435 int dstskip = info->d_skip;
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436 SDL_PixelFormat *dstfmt = info->dst;
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437 const SDL_Color *srcpal = info->src->palette->colors;
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438 int dstbpp;
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439 const int A = info->src->alpha;
0
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440
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441 /* Set up some basic variables */
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442 dstbpp = dstfmt->BytesPerPixel;
0
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diff changeset
443
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diff changeset
444 while (height--) {
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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445 int sR, sG, sB;
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Sam Lantinga <slouken@libsdl.org>
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446 int dR, dG, dB;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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diff changeset
447 /* *INDENT-OFF* */
0
74212992fb08 Initial revision
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diff changeset
448 DUFFS_LOOP4(
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diff changeset
449 {
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diff changeset
450 Uint32 pixel;
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451 sR = srcpal[*src].r;
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452 sG = srcpal[*src].g;
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453 sB = srcpal[*src].b;
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diff changeset
454 DISEMBLE_RGB(dst, dstbpp, dstfmt,
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455 pixel, dR, dG, dB);
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diff changeset
456 ALPHA_BLEND(sR, sG, sB, A, dR, dG, dB);
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diff changeset
457 ASSEMBLE_RGB(dst, dstbpp, dstfmt, dR, dG, dB);
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diff changeset
458 src++;
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diff changeset
459 dst += dstbpp;
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diff changeset
460 },
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diff changeset
461 width);
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462 /* *INDENT-ON* */
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diff changeset
463 src += srcskip;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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diff changeset
464 dst += dstskip;
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465 }
0
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diff changeset
466 }
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diff changeset
467
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diff changeset
468 static void
1668
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diff changeset
469 Blit1toNAlphaKey(SDL_BlitInfo * info)
0
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diff changeset
470 {
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diff changeset
471 int width = info->d_width;
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472 int height = info->d_height;
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Sam Lantinga <slouken@libsdl.org>
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473 Uint8 *src = info->s_pixels;
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474 int srcskip = info->s_skip;
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diff changeset
475 Uint8 *dst = info->d_pixels;
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
476 int dstskip = info->d_skip;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
477 SDL_PixelFormat *srcfmt = info->src;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
478 SDL_PixelFormat *dstfmt = info->dst;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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diff changeset
479 const SDL_Color *srcpal = info->src->palette->colors;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
480 Uint32 ckey = srcfmt->colorkey;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
481 int dstbpp;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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diff changeset
482 const int A = srcfmt->alpha;
0
74212992fb08 Initial revision
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diff changeset
483
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
484 /* Set up some basic variables */
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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diff changeset
485 dstbpp = dstfmt->BytesPerPixel;
0
74212992fb08 Initial revision
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diff changeset
486
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782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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diff changeset
487 while (height--) {
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
488 int sR, sG, sB;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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diff changeset
489 int dR, dG, dB;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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diff changeset
490 /* *INDENT-OFF* */
0
74212992fb08 Initial revision
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diff changeset
491 DUFFS_LOOP(
74212992fb08 Initial revision
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diff changeset
492 {
74212992fb08 Initial revision
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diff changeset
493 if ( *src != ckey ) {
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diff changeset
494 Uint32 pixel;
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diff changeset
495 sR = srcpal[*src].r;
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diff changeset
496 sG = srcpal[*src].g;
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diff changeset
497 sB = srcpal[*src].b;
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diff changeset
498 DISEMBLE_RGB(dst, dstbpp, dstfmt,
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diff changeset
499 pixel, dR, dG, dB);
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diff changeset
500 ALPHA_BLEND(sR, sG, sB, A, dR, dG, dB);
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diff changeset
501 ASSEMBLE_RGB(dst, dstbpp, dstfmt, dR, dG, dB);
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
502 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
503 src++;
74212992fb08 Initial revision
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parents:
diff changeset
504 dst += dstbpp;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
505 },
74212992fb08 Initial revision
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diff changeset
506 width);
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
507 /* *INDENT-ON* */
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
508 src += srcskip;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
509 dst += dstskip;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
510 }
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
511 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
512
74212992fb08 Initial revision
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parents:
diff changeset
513 static SDL_loblit one_blit[] = {
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
514 NULL, Blit1to1, Blit1to2, Blit1to3, Blit1to4
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
515 };
74212992fb08 Initial revision
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parents:
diff changeset
516
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parents:
diff changeset
517 static SDL_loblit one_blitkey[] = {
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
518 NULL, Blit1to1Key, Blit1to2Key, Blit1to3Key, Blit1to4Key
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
519 };
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
520
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
521 SDL_loblit
1668
4da1ee79c9af more tweaking indent options
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parents: 1662
diff changeset
522 SDL_CalculateBlit1(SDL_Surface * surface, int blit_index)
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
523 {
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
524 int which;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
525 SDL_PixelFormat *dstfmt;
0
74212992fb08 Initial revision
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parents:
diff changeset
526
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
527 dstfmt = surface->map->dst->format;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
528 if (dstfmt->BitsPerPixel < 8) {
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
529 which = 0;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
530 } else {
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
531 which = dstfmt->BytesPerPixel;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
532 }
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
533 switch (blit_index) {
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
534 case 0: /* copy */
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
535 return one_blit[which];
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
536
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
537 case 1: /* colorkey */
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
538 return one_blitkey[which];
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
539
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
540 case 2: /* alpha */
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
541 /* Supporting 8bpp->8bpp alpha is doable but requires lots of
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
542 tables which consume space and takes time to precompute,
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
543 so is better left to the user */
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
544 return which >= 2 ? Blit1toNAlpha : NULL;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
545
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
546 case 3: /* alpha + colorkey */
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
547 return which >= 2 ? Blit1toNAlphaKey : NULL;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
548
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
549 }
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
550 return NULL;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
551 }
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
552
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
553 /* vi: set ts=4 sw=4 expandtab: */