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annotate src/video/SDL_blit_0.c @ 2025:7312feb88dad

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Allow grabing mouse by locking its position
author Patrice Mandin <patmandin@gmail.com>
date Tue, 12 Sep 2006 19:47:40 +0000
parents c121d94672cb
children 340942cfda48
rev   line source
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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
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27 /* Functions to blit from bitmaps to other surfaces */
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28
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29 static void
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30 BlitBto1(SDL_BlitInfo * info)
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31 {
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32 int c;
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33 int width, height;
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34 Uint8 *src, *map, *dst;
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35 int srcskip, dstskip;
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36
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37 /* Set up some basic variables */
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38 width = info->d_width;
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39 height = info->d_height;
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40 src = info->s_pixels;
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41 srcskip = info->s_skip;
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42 dst = info->d_pixels;
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43 dstskip = info->d_skip;
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44 map = info->table;
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45 srcskip += width - (width + 7) / 8;
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46
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47 if (map) {
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48 while (height--) {
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49 Uint8 byte = 0, bit;
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50 for (c = 0; c < width; ++c) {
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51 if ((c & 7) == 0) {
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52 byte = *src++;
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53 }
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54 bit = (byte & 0x80) >> 7;
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55 if (1) {
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56 *dst = map[bit];
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57 }
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58 dst++;
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59 byte <<= 1;
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60 }
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61 src += srcskip;
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62 dst += dstskip;
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63 }
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64 } else {
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65 while (height--) {
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66 Uint8 byte = 0, bit;
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67 for (c = 0; c < width; ++c) {
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68 if ((c & 7) == 0) {
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69 byte = *src++;
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70 }
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71 bit = (byte & 0x80) >> 7;
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72 if (1) {
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73 *dst = bit;
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74 }
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75 dst++;
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76 byte <<= 1;
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77 }
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78 src += srcskip;
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79 dst += dstskip;
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80 }
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81 }
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82 }
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83 static void
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84 BlitBto2(SDL_BlitInfo * info)
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85 {
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86 int c;
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87 int width, height;
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88 Uint8 *src;
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89 Uint16 *map, *dst;
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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 = (Uint16 *) info->d_pixels;
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98 dstskip = info->d_skip / 2;
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99 map = (Uint16 *) info->table;
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100 srcskip += width - (width + 7) / 8;
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101
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102 while (height--) {
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103 Uint8 byte = 0, bit;
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104 for (c = 0; c < width; ++c) {
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105 if ((c & 7) == 0) {
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106 byte = *src++;
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107 }
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108 bit = (byte & 0x80) >> 7;
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109 if (1) {
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110 *dst = map[bit];
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111 }
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112 byte <<= 1;
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113 dst++;
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114 }
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115 src += srcskip;
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116 dst += dstskip;
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117 }
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118 }
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119 static void
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120 BlitBto3(SDL_BlitInfo * info)
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121 {
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122 int c, o;
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123 int width, height;
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124 Uint8 *src, *map, *dst;
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125 int srcskip, dstskip;
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126
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127 /* Set up some basic variables */
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128 width = info->d_width;
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129 height = info->d_height;
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130 src = info->s_pixels;
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131 srcskip = info->s_skip;
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132 dst = info->d_pixels;
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133 dstskip = info->d_skip;
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134 map = info->table;
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135 srcskip += width - (width + 7) / 8;
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136
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137 while (height--) {
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138 Uint8 byte = 0, bit;
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139 for (c = 0; c < width; ++c) {
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140 if ((c & 7) == 0) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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141 byte = *src++;
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142 }
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143 bit = (byte & 0x80) >> 7;
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144 if (1) {
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145 o = bit * 4;
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146 dst[0] = map[o++];
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147 dst[1] = map[o++];
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148 dst[2] = map[o++];
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149 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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150 byte <<= 1;
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diff changeset
151 dst += 3;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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152 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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153 src += srcskip;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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154 dst += dstskip;
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155 }
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156 }
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157 static void
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158 BlitBto4(SDL_BlitInfo * info)
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159 {
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160 int width, height;
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161 Uint8 *src;
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162 Uint32 *map, *dst;
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163 int srcskip, dstskip;
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164 int c;
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165
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166 /* Set up some basic variables */
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167 width = info->d_width;
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168 height = info->d_height;
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169 src = info->s_pixels;
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170 srcskip = info->s_skip;
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171 dst = (Uint32 *) info->d_pixels;
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172 dstskip = info->d_skip / 4;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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173 map = (Uint32 *) info->table;
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174 srcskip += width - (width + 7) / 8;
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175
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176 while (height--) {
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177 Uint8 byte = 0, bit;
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178 for (c = 0; c < width; ++c) {
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179 if ((c & 7) == 0) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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180 byte = *src++;
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181 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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182 bit = (byte & 0x80) >> 7;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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183 if (1) {
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diff changeset
184 *dst = map[bit];
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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185 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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186 byte <<= 1;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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187 dst++;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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188 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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189 src += srcskip;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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190 dst += dstskip;
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191 }
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192 }
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193
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194 static void
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195 BlitBto1Key(SDL_BlitInfo * info)
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196 {
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197 int width = info->d_width;
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198 int height = info->d_height;
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199 Uint8 *src = info->s_pixels;
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200 Uint8 *dst = info->d_pixels;
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201 int srcskip = info->s_skip;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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202 int dstskip = info->d_skip;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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203 Uint32 ckey = info->src->colorkey;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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204 Uint8 *palmap = info->table;
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205 int c;
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206
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diff changeset
207 /* Set up some basic variables */
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208 srcskip += width - (width + 7) / 8;
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209
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210 if (palmap) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
211 while (height--) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
212 Uint8 byte = 0, bit;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
213 for (c = 0; c < width; ++c) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
214 if ((c & 7) == 0) {
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diff changeset
215 byte = *src++;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
216 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
217 bit = (byte & 0x80) >> 7;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
218 if (bit != ckey) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
219 *dst = palmap[bit];
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
220 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
221 dst++;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
222 byte <<= 1;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
223 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
224 src += srcskip;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
225 dst += dstskip;
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diff changeset
226 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
227 } else {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
228 while (height--) {
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229 Uint8 byte = 0, bit;
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230 for (c = 0; c < width; ++c) {
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diff changeset
231 if ((c & 7) == 0) {
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diff changeset
232 byte = *src++;
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diff changeset
233 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
234 bit = (byte & 0x80) >> 7;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
235 if (bit != ckey) {
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diff changeset
236 *dst = bit;
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
237 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
238 dst++;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
239 byte <<= 1;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
240 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
241 src += srcskip;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
242 dst += dstskip;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
243 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
244 }
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diff changeset
245 }
74212992fb08 Initial revision
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diff changeset
246
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diff changeset
247 static void
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diff changeset
248 BlitBto2Key(SDL_BlitInfo * info)
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diff changeset
249 {
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diff changeset
250 int width = info->d_width;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
251 int height = info->d_height;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
252 Uint8 *src = info->s_pixels;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
253 Uint16 *dstp = (Uint16 *) info->d_pixels;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
254 int srcskip = info->s_skip;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
255 int dstskip = info->d_skip;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
256 Uint32 ckey = info->src->colorkey;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
257 Uint8 *palmap = info->table;
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diff changeset
258 int c;
0
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diff changeset
259
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diff changeset
260 /* Set up some basic variables */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
261 srcskip += width - (width + 7) / 8;
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262 dstskip /= 2;
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263
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diff changeset
264 while (height--) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
265 Uint8 byte = 0, bit;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
266 for (c = 0; c < width; ++c) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1402
diff changeset
267 if ((c & 7) == 0) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1402
diff changeset
268 byte = *src++;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1402
diff changeset
269 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
270 bit = (byte & 0x80) >> 7;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
271 if (bit != ckey) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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272 *dstp = ((Uint16 *) palmap)[bit];
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
273 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
274 byte <<= 1;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
275 dstp++;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1402
diff changeset
276 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
277 src += srcskip;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
278 dstp += dstskip;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
279 }
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280 }
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281
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282 static void
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283 BlitBto3Key(SDL_BlitInfo * info)
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284 {
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285 int width = info->d_width;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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286 int height = info->d_height;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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287 Uint8 *src = info->s_pixels;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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288 Uint8 *dst = info->d_pixels;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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289 int srcskip = info->s_skip;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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290 int dstskip = info->d_skip;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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291 Uint32 ckey = info->src->colorkey;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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292 Uint8 *palmap = info->table;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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293 int c;
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294
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295 /* Set up some basic variables */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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296 srcskip += width - (width + 7) / 8;
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297
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298 while (height--) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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299 Uint8 byte = 0, bit;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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300 for (c = 0; c < width; ++c) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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301 if ((c & 7) == 0) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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302 byte = *src++;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
303 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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304 bit = (byte & 0x80) >> 7;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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305 if (bit != ckey) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
306 SDL_memcpy(dst, &palmap[bit * 4], 3);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1402
diff changeset
307 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
308 byte <<= 1;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
309 dst += 3;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
310 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
311 src += srcskip;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
312 dst += dstskip;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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313 }
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diff changeset
314 }
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diff changeset
315
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diff changeset
316 static void
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
317 BlitBto4Key(SDL_BlitInfo * info)
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diff changeset
318 {
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diff changeset
319 int width = info->d_width;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
320 int height = info->d_height;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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321 Uint8 *src = info->s_pixels;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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322 Uint32 *dstp = (Uint32 *) info->d_pixels;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
323 int srcskip = info->s_skip;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
324 int dstskip = info->d_skip;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
325 Uint32 ckey = info->src->colorkey;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
326 Uint8 *palmap = info->table;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
327 int c;
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328
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diff changeset
329 /* Set up some basic variables */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
330 srcskip += width - (width + 7) / 8;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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331 dstskip /= 4;
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diff changeset
332
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c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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333 while (height--) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
334 Uint8 byte = 0, bit;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
335 for (c = 0; c < width; ++c) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1402
diff changeset
336 if ((c & 7) == 0) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
337 byte = *src++;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
338 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
339 bit = (byte & 0x80) >> 7;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
340 if (bit != ckey) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
341 *dstp = ((Uint32 *) palmap)[bit];
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
342 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
343 byte <<= 1;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
344 dstp++;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
345 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
346 src += srcskip;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
347 dstp += dstskip;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
348 }
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diff changeset
349 }
74212992fb08 Initial revision
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diff changeset
350
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diff changeset
351 static void
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
352 BlitBtoNAlpha(SDL_BlitInfo * info)
0
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diff changeset
353 {
1895
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354 int width = info->d_width;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
355 int height = info->d_height;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
356 Uint8 *src = info->s_pixels;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
357 Uint8 *dst = info->d_pixels;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
358 int srcskip = info->s_skip;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
359 int dstskip = info->d_skip;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
360 const SDL_Color *srcpal = info->src->palette->colors;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
361 SDL_PixelFormat *dstfmt = info->dst;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
362 int dstbpp;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
363 int c;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
364 const int A = info->src->alpha;
0
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diff changeset
365
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
366 /* Set up some basic variables */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
367 dstbpp = dstfmt->BytesPerPixel;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
368 srcskip += width - (width + 7) / 8;
0
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diff changeset
369
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
370 while (height--) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
371 Uint8 byte = 0, bit;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
372 for (c = 0; c < width; ++c) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
373 if ((c & 7) == 0) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
374 byte = *src++;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
375 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
376 bit = (byte & 0x80) >> 7;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
377 if (1) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
378 Uint32 pixel;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
379 unsigned sR, sG, sB;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
380 unsigned dR, dG, dB;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
381 sR = srcpal[bit].r;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
382 sG = srcpal[bit].g;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
383 sB = srcpal[bit].b;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
384 DISEMBLE_RGB(dst, dstbpp, dstfmt, pixel, dR, dG, dB);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
385 ALPHA_BLEND(sR, sG, sB, A, dR, dG, dB);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
386 ASSEMBLE_RGB(dst, dstbpp, dstfmt, dR, dG, dB);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
387 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
388 byte <<= 1;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
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
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397 BlitBtoNAlphaKey(SDL_BlitInfo * info)
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398 {
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399 int width = info->d_width;
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400 int height = info->d_height;
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401 Uint8 *src = info->s_pixels;
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402 Uint8 *dst = info->d_pixels;
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403 int srcskip = info->s_skip;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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404 int dstskip = info->d_skip;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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405 SDL_PixelFormat *srcfmt = info->src;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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406 SDL_PixelFormat *dstfmt = info->dst;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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407 const SDL_Color *srcpal = srcfmt->palette->colors;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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408 int dstbpp;
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409 int c;
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410 const int A = srcfmt->alpha;
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411 Uint32 ckey = srcfmt->colorkey;
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412
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413 /* Set up some basic variables */
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414 dstbpp = dstfmt->BytesPerPixel;
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415 srcskip += width - (width + 7) / 8;
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416
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417 while (height--) {
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418 Uint8 byte = 0, bit;
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419 for (c = 0; c < width; ++c) {
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420 if ((c & 7) == 0) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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421 byte = *src++;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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422 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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423 bit = (byte & 0x80) >> 7;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
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424 if (bit != ckey) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1402
diff changeset
425 int sR, sG, sB;
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426 int dR, dG, dB;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
427 Uint32 pixel;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
428 sR = srcpal[bit].r;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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429 sG = srcpal[bit].g;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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430 sB = srcpal[bit].b;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1402
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431 DISEMBLE_RGB(dst, dstbpp, dstfmt, pixel, dR, dG, dB);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
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432 ALPHA_BLEND(sR, sG, sB, A, dR, dG, dB);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
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433 ASSEMBLE_RGB(dst, dstbpp, dstfmt, dR, dG, dB);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
434 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
435 byte <<= 1;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
436 dst += dstbpp;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
437 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
438 src += srcskip;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
439 dst += dstskip;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
440 }
0
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diff changeset
441 }
74212992fb08 Initial revision
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diff changeset
442
74212992fb08 Initial revision
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443 static SDL_loblit bitmap_blit[] = {
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
444 NULL, BlitBto1, BlitBto2, BlitBto3, BlitBto4
0
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diff changeset
445 };
74212992fb08 Initial revision
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diff changeset
446
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diff changeset
447 static SDL_loblit colorkey_blit[] = {
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diff changeset
448 NULL, BlitBto1Key, BlitBto2Key, BlitBto3Key, BlitBto4Key
74212992fb08 Initial revision
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parents:
diff changeset
449 };
74212992fb08 Initial revision
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diff changeset
450
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
451 SDL_loblit
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
452 SDL_CalculateBlit0(SDL_Surface * surface, int blit_index)
0
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diff changeset
453 {
1895
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diff changeset
454 int which;
0
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diff changeset
455
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diff changeset
456 if (surface->format->BitsPerPixel != 1) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
457 /* We don't support sub 8-bit packed pixel modes */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
458 return NULL;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
459 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
460 if (surface->map->dst->format->BitsPerPixel < 8) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
461 which = 0;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
462 } else {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
463 which = surface->map->dst->format->BytesPerPixel;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
464 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
465 switch (blit_index) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
466 case 0: /* copy */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
467 return bitmap_blit[which];
0
74212992fb08 Initial revision
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parents:
diff changeset
468
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
469 case 1: /* colorkey */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
470 return colorkey_blit[which];
0
74212992fb08 Initial revision
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parents:
diff changeset
471
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
472 case 2: /* alpha */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
473 return which >= 2 ? BlitBtoNAlpha : NULL;
0
74212992fb08 Initial revision
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diff changeset
474
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
475 case 4: /* alpha + colorkey */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
476 return which >= 2 ? BlitBtoNAlphaKey : NULL;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
477 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
478 return NULL;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
479 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
480
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
481 /* vi: set ts=4 sw=4 expandtab: */