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0
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997, 1998, 1999, 2000, 2001 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 Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 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 Library 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 Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18
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19 Sam Lantinga
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20 slouken@devolution.com
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21 */
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22
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23 #ifdef SAVE_RCSID
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24 static char rcsid =
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25 "@(#) $Id$";
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26 #endif
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27
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28 #include <stdio.h>
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29
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30 #include "SDL_types.h"
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31 #include "SDL_video.h"
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32 #include "SDL_blit.h"
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33 #include "SDL_sysvideo.h"
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34 #include "SDL_endian.h"
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35
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36 /* Functions to blit from 8-bit surfaces to other surfaces */
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37
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38 static void Blit1to1(SDL_BlitInfo *info)
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39 {
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40 #ifndef USE_DUFFS_LOOP
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41 int c;
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42 #endif
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43 int width, height;
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44 Uint8 *src, *map, *dst;
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45 int srcskip, dstskip;
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46
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47 /* Set up some basic variables */
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48 width = info->d_width;
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49 height = info->d_height;
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50 src = info->s_pixels;
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51 srcskip = info->s_skip;
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52 dst = info->d_pixels;
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53 dstskip = info->d_skip;
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54 map = info->table;
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55
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56 while ( height-- ) {
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57 #ifdef USE_DUFFS_LOOP
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58 DUFFS_LOOP(
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59 {
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60 *dst = map[*src];
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61 }
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62 dst++;
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63 src++;
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64 , width);
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65 #else
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66 for ( c=width; c; --c ) {
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67 *dst = map[*src];
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68 dst++;
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69 src++;
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70 }
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71 #endif
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72 src += srcskip;
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73 dst += dstskip;
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74 }
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75 }
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76 /* This is now endian dependent */
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77 #if ( SDL_BYTEORDER == SDL_LIL_ENDIAN )
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78 #define HI 1
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79 #define LO 0
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80 #else /* ( SDL_BYTEORDER == SDL_BIG_ENDIAN ) */
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81 #define HI 0
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82 #define LO 1
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83 #endif
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84 static void Blit1to2(SDL_BlitInfo *info)
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85 {
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86 #ifndef USE_DUFFS_LOOP
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87 int c;
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88 #endif
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89 int width, height;
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90 Uint8 *src, *dst;
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91 Uint16 *map;
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92 int srcskip, dstskip;
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93
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94 /* Set up some basic variables */
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95 width = info->d_width;
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96 height = info->d_height;
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97 src = info->s_pixels;
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98 srcskip = info->s_skip;
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99 dst = info->d_pixels;
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100 dstskip = info->d_skip;
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101 map = (Uint16 *)info->table;
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102
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103 #ifdef USE_DUFFS_LOOP
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104 while ( height-- ) {
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105 DUFFS_LOOP(
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106 {
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107 *(Uint16 *)dst = map[*src++];
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108 dst += 2;
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109 },
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110 width);
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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 =
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131 (map[src[HI]]<<16)|(map[src[LO]]);
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132 src += 2;
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133 dst += 4;
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134 *(Uint32 *)dst =
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135 (map[src[HI]]<<16)|(map[src[LO]]);
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136 src += 2;
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137 dst += 4;
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138 }
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139 /* Get any leftovers */
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140 switch (width % 4) {
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141 case 3:
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142 *(Uint16 *)dst = map[*src++];
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143 dst += 2;
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144 case 2:
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145 *(Uint32 *)dst =
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146 (map[src[HI]]<<16)|(map[src[LO]]);
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147 src += 2;
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148 dst += 4;
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149 break;
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150 case 1:
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151 *(Uint16 *)dst = map[*src++];
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152 dst += 2;
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153 break;
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154 }
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155 src += srcskip;
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156 dst += dstskip;
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157 }
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158 } else {
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159 while ( height-- ) {
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160 /* Copy in 4 pixel chunks */
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161 for ( c=width/4; c; --c ) {
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162 *(Uint32 *)dst =
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163 (map[src[HI]]<<16)|(map[src[LO]]);
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164 src += 2;
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165 dst += 4;
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166 *(Uint32 *)dst =
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167 (map[src[HI]]<<16)|(map[src[LO]]);
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168 src += 2;
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169 dst += 4;
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170 }
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171 /* Get any leftovers */
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172 switch (width % 4) {
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173 case 3:
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174 *(Uint16 *)dst = map[*src++];
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175 dst += 2;
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176 case 2:
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177 *(Uint32 *)dst =
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178 (map[src[HI]]<<16)|(map[src[LO]]);
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179 src += 2;
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180 dst += 4;
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181 break;
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182 case 1:
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183 *(Uint16 *)dst = map[*src++];
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184 dst += 2;
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185 break;
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186 }
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187 src += srcskip;
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188 dst += dstskip;
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189 }
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190 }
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191 #endif /* USE_DUFFS_LOOP */
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192 }
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193 static void Blit1to3(SDL_BlitInfo *info)
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194 {
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195 #ifndef USE_DUFFS_LOOP
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196 int c;
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197 #endif
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198 int o;
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199 int width, height;
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200 Uint8 *src, *map, *dst;
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201 int srcskip, dstskip;
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202
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203 /* Set up some basic variables */
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204 width = info->d_width;
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205 height = info->d_height;
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206 src = info->s_pixels;
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207 srcskip = info->s_skip;
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208 dst = info->d_pixels;
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209 dstskip = info->d_skip;
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210 map = info->table;
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211
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212 while ( height-- ) {
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213 #ifdef USE_DUFFS_LOOP
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214 DUFFS_LOOP(
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215 {
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216 o = *src * 4;
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217 dst[0] = map[o++];
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218 dst[1] = map[o++];
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219 dst[2] = map[o++];
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220 }
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221 src++;
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222 dst += 3;
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223 , width);
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224 #else
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225 for ( c=width; c; --c ) {
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226 o = *src * 4;
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227 dst[0] = map[o++];
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228 dst[1] = map[o++];
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229 dst[2] = map[o++];
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230 src++;
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231 dst += 3;
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232 }
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233 #endif /* USE_DUFFS_LOOP */
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234 src += srcskip;
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235 dst += dstskip;
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236 }
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237 }
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238 static void Blit1to4(SDL_BlitInfo *info)
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239 {
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240 #ifndef USE_DUFFS_LOOP
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241 int c;
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242 #endif
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243 int width, height;
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244 Uint8 *src;
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245 Uint32 *map, *dst;
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246 int srcskip, dstskip;
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247
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248 /* Set up some basic variables */
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249 width = info->d_width;
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250 height = info->d_height;
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251 src = info->s_pixels;
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252 srcskip = info->s_skip;
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253 dst = (Uint32 *)info->d_pixels;
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254 dstskip = info->d_skip/4;
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255 map = (Uint32 *)info->table;
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256
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257 while ( height-- ) {
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258 #ifdef USE_DUFFS_LOOP
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259 DUFFS_LOOP(
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260 *dst++ = map[*src++];
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261 , width);
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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 % 4 ) {
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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 Blit1to1Key(SDL_BlitInfo *info)
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284 {
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285 int width = info->d_width;
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286 int height = info->d_height;
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287 Uint8 *src = info->s_pixels;
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288 int srcskip = info->s_skip;
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289 Uint8 *dst = info->d_pixels;
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290 int dstskip = info->d_skip;
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291 Uint8 *palmap = info->table;
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292 Uint32 ckey = info->src->colorkey;
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293
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294 if ( palmap ) {
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295 while ( height-- ) {
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296 DUFFS_LOOP(
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297 {
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298 if ( *src != ckey ) {
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299 *dst = palmap[*src];
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300 }
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301 dst++;
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302 src++;
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303 },
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304 width);
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305 src += srcskip;
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306 dst += dstskip;
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307 }
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308 } else {
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309 while ( height-- ) {
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310 DUFFS_LOOP(
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311 {
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312 if ( *src != ckey ) {
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313 *dst = *src;
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314 }
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315 dst++;
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316 src++;
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317 },
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318 width);
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319 src += srcskip;
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320 dst += dstskip;
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321 }
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322 }
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323 }
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324
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325 static void Blit1to2Key(SDL_BlitInfo *info)
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326 {
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327 int width = info->d_width;
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328 int height = info->d_height;
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329 Uint8 *src = info->s_pixels;
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330 int srcskip = info->s_skip;
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331 Uint16 *dstp = (Uint16 *)info->d_pixels;
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332 int dstskip = info->d_skip;
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333 Uint16 *palmap = (Uint16 *)info->table;
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334 Uint32 ckey = info->src->colorkey;
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335
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336 /* Set up some basic variables */
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337 dstskip /= 2;
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338
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339 while ( height-- ) {
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340 DUFFS_LOOP(
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341 {
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342 if ( *src != ckey ) {
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343 *dstp=palmap[*src];
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344 }
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345 src++;
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346 dstp++;
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347 },
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348 width);
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349 src += srcskip;
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350 dstp += dstskip;
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351 }
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352 }
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353
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354 static void Blit1to3Key(SDL_BlitInfo *info)
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355 {
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356 int width = info->d_width;
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357 int height = info->d_height;
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358 Uint8 *src = info->s_pixels;
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359 int srcskip = info->s_skip;
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360 Uint8 *dst = info->d_pixels;
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361 int dstskip = info->d_skip;
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362 Uint8 *palmap = info->table;
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363 Uint32 ckey = info->src->colorkey;
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364 int o;
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365
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366 while ( height-- ) {
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367 DUFFS_LOOP(
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368 {
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369 if ( *src != ckey ) {
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370 o = *src * 4;
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371 dst[0] = palmap[o++];
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372 dst[1] = palmap[o++];
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373 dst[2] = palmap[o++];
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374 }
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375 src++;
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376 dst += 3;
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377 },
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378 width);
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379 src += srcskip;
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380 dst += dstskip;
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381 }
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382 }
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383
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384 static void Blit1to4Key(SDL_BlitInfo *info)
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385 {
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386 int width = info->d_width;
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387 int height = info->d_height;
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388 Uint8 *src = info->s_pixels;
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389 int srcskip = info->s_skip;
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390 Uint32 *dstp = (Uint32 *)info->d_pixels;
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391 int dstskip = info->d_skip;
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392 Uint32 *palmap = (Uint32 *)info->table;
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393 Uint32 ckey = info->src->colorkey;
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394
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395 /* Set up some basic variables */
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396 dstskip /= 4;
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397
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398 while ( height-- ) {
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399 DUFFS_LOOP(
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400 {
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401 if ( *src != ckey ) {
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402 *dstp = palmap[*src];
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403 }
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404 src++;
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405 dstp++;
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406 },
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407 width);
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408 src += srcskip;
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409 dstp += dstskip;
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410 }
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411 }
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412
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413 static void Blit1toNAlpha(SDL_BlitInfo *info)
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414 {
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415 int width = info->d_width;
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416 int height = info->d_height;
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417 Uint8 *src = info->s_pixels;
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418 int srcskip = info->s_skip;
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419 Uint8 *dst = info->d_pixels;
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420 int dstskip = info->d_skip;
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421 SDL_PixelFormat *dstfmt = info->dst;
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422 const SDL_Color *srcpal = info->src->palette->colors;
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423 int dstbpp;
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424 const int A = info->src->alpha;
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425
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426 /* Set up some basic variables */
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427 dstbpp = dstfmt->BytesPerPixel;
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428
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429 while ( height-- ) {
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430 int sR, sG, sB;
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431 int dR, dG, dB;
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432 DUFFS_LOOP4(
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433 {
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434 Uint32 pixel;
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435 sR = srcpal[*src].r;
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436 sG = srcpal[*src].g;
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437 sB = srcpal[*src].b;
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438 DISEMBLE_RGB(dst, dstbpp, dstfmt,
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439 pixel, dR, dG, dB);
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440 ALPHA_BLEND(sR, sG, sB, A, dR, dG, dB);
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441 ASSEMBLE_RGB(dst, dstbpp, dstfmt, dR, dG, dB);
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442 src++;
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443 dst += dstbpp;
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444 },
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445 width);
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446 src += srcskip;
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447 dst += dstskip;
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448 }
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449 }
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450
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451 static void Blit1toNAlphaKey(SDL_BlitInfo *info)
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452 {
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453 int width = info->d_width;
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454 int height = info->d_height;
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455 Uint8 *src = info->s_pixels;
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456 int srcskip = info->s_skip;
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457 Uint8 *dst = info->d_pixels;
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458 int dstskip = info->d_skip;
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459 SDL_PixelFormat *srcfmt = info->src;
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460 SDL_PixelFormat *dstfmt = info->dst;
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461 const SDL_Color *srcpal = info->src->palette->colors;
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462 Uint32 ckey = srcfmt->colorkey;
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463 int dstbpp;
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464 const int A = srcfmt->alpha;
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465
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466 /* Set up some basic variables */
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467 dstbpp = dstfmt->BytesPerPixel;
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468
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469 while ( height-- ) {
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470 int sR, sG, sB;
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471 int dR, dG, dB;
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472 DUFFS_LOOP(
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473 {
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474 if ( *src != ckey ) {
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475 Uint32 pixel;
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476 sR = srcpal[*src].r;
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477 sG = srcpal[*src].g;
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478 sB = srcpal[*src].b;
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479 DISEMBLE_RGB(dst, dstbpp, dstfmt,
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480 pixel, dR, dG, dB);
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481 ALPHA_BLEND(sR, sG, sB, A, dR, dG, dB);
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482 ASSEMBLE_RGB(dst, dstbpp, dstfmt, dR, dG, dB);
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483 }
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484 src++;
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485 dst += dstbpp;
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486 },
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487 width);
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488 src += srcskip;
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489 dst += dstskip;
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490 }
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491 }
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492
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493 static SDL_loblit one_blit[] = {
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494 NULL, Blit1to1, Blit1to2, Blit1to3, Blit1to4
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495 };
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496
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497 static SDL_loblit one_blitkey[] = {
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498 NULL, Blit1to1Key, Blit1to2Key, Blit1to3Key, Blit1to4Key
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499 };
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500
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501 SDL_loblit SDL_CalculateBlit1(SDL_Surface *surface, int blit_index)
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502 {
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503 int which;
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504 SDL_PixelFormat *dstfmt;
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505
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506 dstfmt = surface->map->dst->format;
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507 if ( dstfmt->BitsPerPixel < 8 ) {
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508 which = 0;
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509 } else {
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510 which = dstfmt->BytesPerPixel;
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511 }
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512 switch(blit_index) {
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513 case 0: /* copy */
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514 return one_blit[which];
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515
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516 case 1: /* colorkey */
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517 return one_blitkey[which];
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518
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519 case 2: /* alpha */
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520 /* Supporting 8bpp->8bpp alpha is doable but requires lots of
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521 tables which consume space and takes time to precompute,
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522 so is better left to the user */
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523 return which >= 2 ? Blit1toNAlpha : NULL;
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524
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525 case 3: /* alpha + colorkey */
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526 return which >= 2 ? Blit1toNAlphaKey : NULL;
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527
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528 }
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529 return NULL;
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|
530 }
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