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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 #include <string.h>
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30
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31 #include "SDL_types.h"
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32 #include "SDL_video.h"
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33 #include "SDL_blit.h"
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34
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35 /* Functions to blit from bitmaps to other surfaces */
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36
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37 static void BlitBto1(SDL_BlitInfo *info)
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38 {
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39 int c;
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40 int width, height;
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41 Uint8 *src, *map, *dst;
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42 int srcskip, dstskip;
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43
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44 /* Set up some basic variables */
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45 width = info->d_width;
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46 height = info->d_height;
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47 src = info->s_pixels;
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48 srcskip = info->s_skip;
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49 dst = info->d_pixels;
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50 dstskip = info->d_skip;
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51 map = info->table;
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52 srcskip += width-(width+7)/8;
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53
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54 if ( map ) {
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55 while ( height-- ) {
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56 Uint8 byte = 0, bit;
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57 for ( c=0; c<width; ++c ) {
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58 if ( (c%8) == 0 ) {
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59 byte = *src++;
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60 }
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61 bit = (byte&0x80)>>7;
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62 if ( 1 ) {
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63 *dst = map[bit];
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64 }
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65 dst++;
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66 byte <<= 1;
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67 }
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68 src += srcskip;
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69 dst += dstskip;
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70 }
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71 } else {
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72 while ( height-- ) {
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73 Uint8 byte = 0, bit;
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74 for ( c=0; c<width; ++c ) {
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75 if ( (c%8) == 0 ) {
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76 byte = *src++;
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77 }
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78 bit = (byte&0x80)>>7;
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79 if ( 1 ) {
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80 *dst = bit;
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81 }
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82 dst++;
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83 byte <<= 1;
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84 }
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85 src += srcskip;
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86 dst += dstskip;
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87 }
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88 }
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89 }
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90 static void BlitBto2(SDL_BlitInfo *info)
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91 {
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92 int c;
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93 int width, height;
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94 Uint8 *src;
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95 Uint16 *map, *dst;
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96 int srcskip, dstskip;
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97
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98 /* Set up some basic variables */
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99 width = info->d_width;
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100 height = info->d_height;
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101 src = info->s_pixels;
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102 srcskip = info->s_skip;
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103 dst = (Uint16 *)info->d_pixels;
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104 dstskip = info->d_skip/2;
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105 map = (Uint16 *)info->table;
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106 srcskip += width-(width+7)/8;
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107
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108 while ( height-- ) {
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109 Uint8 byte = 0, bit;
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110 for ( c=0; c<width; ++c ) {
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111 if ( (c%8) == 0 ) {
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112 byte = *src++;
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113 }
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114 bit = (byte&0x80)>>7;
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115 if ( 1 ) {
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116 *dst = map[bit];
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117 }
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118 byte <<= 1;
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119 dst++;
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120 }
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121 src += srcskip;
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122 dst += dstskip;
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123 }
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124 }
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125 static void BlitBto3(SDL_BlitInfo *info)
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126 {
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127 int c, o;
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128 int width, height;
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129 Uint8 *src, *map, *dst;
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130 int srcskip, dstskip;
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131
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132 /* Set up some basic variables */
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133 width = info->d_width;
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134 height = info->d_height;
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135 src = info->s_pixels;
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136 srcskip = info->s_skip;
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137 dst = info->d_pixels;
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138 dstskip = info->d_skip;
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139 map = info->table;
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140 srcskip += width-(width+7)/8;
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141
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142 while ( height-- ) {
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143 Uint8 byte = 0, bit;
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144 for ( c=0; c<width; ++c ) {
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145 if ( (c%8) == 0 ) {
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146 byte = *src++;
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147 }
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148 bit = (byte&0x80)>>7;
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149 if ( 1 ) {
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150 o = bit * 4;
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151 dst[0] = map[o++];
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152 dst[1] = map[o++];
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153 dst[2] = map[o++];
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154 }
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155 byte <<= 1;
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156 dst += 3;
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157 }
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158 src += srcskip;
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159 dst += dstskip;
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160 }
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161 }
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162 static void BlitBto4(SDL_BlitInfo *info)
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163 {
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164 int width, height;
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165 Uint8 *src;
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166 Uint32 *map, *dst;
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167 int srcskip, dstskip;
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168 int c;
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169
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170 /* Set up some basic variables */
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171 width = info->d_width;
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172 height = info->d_height;
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173 src = info->s_pixels;
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174 srcskip = info->s_skip;
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175 dst = (Uint32 *)info->d_pixels;
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176 dstskip = info->d_skip/4;
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177 map = (Uint32 *)info->table;
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178 srcskip += width-(width+7)/8;
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179
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180 while ( height-- ) {
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181 Uint8 byte = 0, bit;
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182 for ( c=0; c<width; ++c ) {
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183 if ( (c%8) == 0 ) {
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184 byte = *src++;
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185 }
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186 bit = (byte&0x80)>>7;
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187 if ( 1 ) {
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188 *dst = map[bit];
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189 }
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190 byte <<= 1;
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191 dst++;
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192 }
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193 src += srcskip;
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194 dst += dstskip;
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195 }
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196 }
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197
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198 static void BlitBto1Key(SDL_BlitInfo *info)
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199 {
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200 int width = info->d_width;
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201 int height = info->d_height;
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202 Uint8 *src = info->s_pixels;
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203 Uint8 *dst = info->d_pixels;
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204 int srcskip = info->s_skip;
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205 int dstskip = info->d_skip;
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206 Uint32 ckey = info->src->colorkey;
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207 Uint8 *palmap = info->table;
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208 int c;
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209
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210 /* Set up some basic variables */
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211 srcskip += width-(width+7)/8;
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212
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213 if ( palmap ) {
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214 while ( height-- ) {
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215 Uint8 byte = 0, bit;
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216 for ( c=0; c<width; ++c ) {
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217 if ( (c%8) == 0 ) {
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218 byte = *src++;
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219 }
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220 bit = (byte&0x80)>>7;
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221 if ( bit != ckey ) {
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222 *dst = palmap[bit];
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223 }
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224 dst++;
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225 byte <<= 1;
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226 }
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227 src += srcskip;
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228 dst += dstskip;
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229 }
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230 } else {
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231 while ( height-- ) {
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232 Uint8 byte = 0, bit;
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233 for ( c=0; c<width; ++c ) {
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234 if ( (c%8) == 0 ) {
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235 byte = *src++;
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236 }
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237 bit = (byte&0x80)>>7;
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238 if ( bit != ckey ) {
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239 *dst = bit;
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240 }
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241 dst++;
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242 byte <<= 1;
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243 }
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244 src += srcskip;
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245 dst += dstskip;
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246 }
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247 }
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248 }
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249
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250 static void BlitBto2Key(SDL_BlitInfo *info)
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251 {
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252 int width = info->d_width;
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253 int height = info->d_height;
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254 Uint8 *src = info->s_pixels;
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255 Uint16 *dstp = (Uint16 *)info->d_pixels;
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256 int srcskip = info->s_skip;
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257 int dstskip = info->d_skip;
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258 Uint32 ckey = info->src->colorkey;
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259 Uint8 *palmap = info->table;
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260 int c;
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261
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262 /* Set up some basic variables */
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263 srcskip += width-(width+7)/8;
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264 dstskip /= 2;
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265
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266 while ( height-- ) {
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267 Uint8 byte = 0, bit;
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268 for ( c=0; c<width; ++c ) {
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269 if ( (c%8) == 0 ) {
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270 byte = *src++;
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271 }
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272 bit = (byte&0x80)>>7;
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273 if ( bit != ckey ) {
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274 *dstp=((Uint16 *)palmap)[bit];
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275 }
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276 byte <<= 1;
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277 dstp++;
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278 }
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279 src += srcskip;
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280 dstp += dstskip;
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281 }
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282 }
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283
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284 static void BlitBto3Key(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 Uint8 *dst = info->d_pixels;
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290 int srcskip = info->s_skip;
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291 int dstskip = info->d_skip;
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292 Uint32 ckey = info->src->colorkey;
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293 Uint8 *palmap = info->table;
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294 int c;
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295
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296 /* Set up some basic variables */
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297 srcskip += width-(width+7)/8;
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298
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299 while ( height-- ) {
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300 Uint8 byte = 0, bit;
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301 for ( c=0; c<width; ++c ) {
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302 if ( (c%8) == 0 ) {
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303 byte = *src++;
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304 }
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305 bit = (byte&0x80)>>7;
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306 if ( bit != ckey ) {
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307 memcpy(dst, &palmap[bit*4], 3);
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308 }
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309 byte <<= 1;
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310 dst += 3;
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311 }
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312 src += srcskip;
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313 dst += dstskip;
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314 }
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315 }
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316
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317 static void BlitBto4Key(SDL_BlitInfo *info)
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318 {
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319 int width = info->d_width;
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320 int height = info->d_height;
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321 Uint8 *src = info->s_pixels;
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322 Uint32 *dstp = (Uint32 *)info->d_pixels;
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323 int srcskip = info->s_skip;
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324 int dstskip = info->d_skip;
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325 Uint32 ckey = info->src->colorkey;
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326 Uint8 *palmap = info->table;
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327 int c;
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328
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329 /* Set up some basic variables */
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330 srcskip += width-(width+7)/8;
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331 dstskip /= 4;
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332
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333 while ( height-- ) {
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334 Uint8 byte = 0, bit;
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335 for ( c=0; c<width; ++c ) {
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336 if ( (c%8) == 0 ) {
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337 byte = *src++;
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338 }
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339 bit = (byte&0x80)>>7;
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340 if ( bit != ckey ) {
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341 *dstp=((Uint32 *)palmap)[bit];
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342 }
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343 byte <<= 1;
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344 dstp++;
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345 }
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346 src += srcskip;
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347 dstp += dstskip;
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348 }
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349 }
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350
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351 static void BlitBtoNAlpha(SDL_BlitInfo *info)
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352 {
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353 int width = info->d_width;
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354 int height = info->d_height;
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355 Uint8 *src = info->s_pixels;
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356 Uint8 *dst = info->d_pixels;
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357 int srcskip = info->s_skip;
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358 int dstskip = info->d_skip;
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359 const SDL_Color *srcpal = info->src->palette->colors;
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360 SDL_PixelFormat *dstfmt = info->dst;
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361 int dstbpp;
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362 int c;
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363 const int A = info->src->alpha;
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364
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365 /* Set up some basic variables */
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366 dstbpp = dstfmt->BytesPerPixel;
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367 srcskip += width-(width+7)/8;
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368
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369 while ( height-- ) {
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370 Uint8 byte = 0, bit;
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371 for ( c=0; c<width; ++c ) {
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372 if ( (c%8) == 0 ) {
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373 byte = *src++;
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374 }
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375 bit = (byte&0x80)>>7;
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376 if ( 1 ) {
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377 Uint32 pixel;
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378 unsigned sR, sG, sB;
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379 unsigned dR, dG, dB;
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380 sR = srcpal[bit].r;
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381 sG = srcpal[bit].g;
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382 sB = srcpal[bit].b;
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383 DISEMBLE_RGB(dst, dstbpp, dstfmt,
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384 pixel, dR, dG, dB);
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385 ALPHA_BLEND(sR, sG, sB, A, dR, dG, dB);
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386 ASSEMBLE_RGB(dst, dstbpp, dstfmt, dR, dG, dB);
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387 }
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388 byte <<= 1;
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389 dst += dstbpp;
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390 }
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391 src += srcskip;
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392 dst += dstskip;
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393 }
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394 }
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395
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396 static void BlitBtoNAlphaKey(SDL_BlitInfo *info)
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397 {
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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 Uint8 *dst = info->d_pixels;
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402 int srcskip = info->s_skip;
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403 int dstskip = info->d_skip;
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404 SDL_PixelFormat *srcfmt = info->src;
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405 SDL_PixelFormat *dstfmt = info->dst;
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406 const SDL_Color *srcpal = srcfmt->palette->colors;
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407 int dstbpp;
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408 int c;
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409 const int A = srcfmt->alpha;
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410 Uint32 ckey = srcfmt->colorkey;
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411
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412 /* Set up some basic variables */
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413 dstbpp = dstfmt->BytesPerPixel;
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414 srcskip += width-(width+7)/8;
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415
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416 while ( height-- ) {
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417 Uint8 byte = 0, bit;
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418 for ( c=0; c<width; ++c ) {
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419 if ( (c%8) == 0 ) {
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420 byte = *src++;
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421 }
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422 bit = (byte&0x80)>>7;
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423 if ( bit != ckey ) {
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424 int sR, sG, sB;
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425 int dR, dG, dB;
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426 Uint32 pixel;
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427 sR = srcpal[bit].r;
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428 sG = srcpal[bit].g;
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429 sB = srcpal[bit].b;
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430 DISEMBLE_RGB(dst, dstbpp, dstfmt,
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431 pixel, dR, dG, dB);
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432 ALPHA_BLEND(sR, sG, sB, A, dR, dG, dB);
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433 ASSEMBLE_RGB(dst, dstbpp, dstfmt, dR, dG, dB);
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434 }
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435 byte <<= 1;
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436 dst += dstbpp;
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437 }
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438 src += srcskip;
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439 dst += dstskip;
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440 }
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441 }
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442
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443 static SDL_loblit bitmap_blit[] = {
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444 NULL, BlitBto1, BlitBto2, BlitBto3, BlitBto4
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445 };
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446
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447 static SDL_loblit colorkey_blit[] = {
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448 NULL, BlitBto1Key, BlitBto2Key, BlitBto3Key, BlitBto4Key
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449 };
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450
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451 SDL_loblit SDL_CalculateBlit0(SDL_Surface *surface, int blit_index)
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452 {
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453 int which;
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454
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455 if ( surface->map->dst->format->BitsPerPixel < 8 ) {
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456 which = 0;
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457 } else {
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458 which = surface->map->dst->format->BytesPerPixel;
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459 }
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460 switch(blit_index) {
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461 case 0: /* copy */
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462 return bitmap_blit[which];
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463
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464 case 1: /* colorkey */
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465 return colorkey_blit[which];
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466
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467 case 2: /* alpha */
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468 return which >= 2 ? BlitBtoNAlpha : NULL;
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469
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470 case 4: /* alpha + colorkey */
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471 return which >= 2 ? BlitBtoNAlphaKey : NULL;
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472 }
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473 return NULL;
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474 }
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475
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