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2901
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2009 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_draw.h"
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25
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26 static int
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27 SDL_BlendPoint_RGB555(SDL_Surface * dst, int x, int y, int blendMode, Uint8 r,
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28 Uint8 g, Uint8 b, Uint8 a)
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29 {
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30 unsigned inva = 0xff - a;
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31
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32 switch (blendMode) {
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33 case SDL_BLENDMODE_BLEND:
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34 DRAW_SETPIXELXY_BLEND_RGB555(x, y);
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35 break;
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36 case SDL_BLENDMODE_ADD:
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37 DRAW_SETPIXELXY_ADD_RGB555(x, y);
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38 break;
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39 case SDL_BLENDMODE_MOD:
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40 DRAW_SETPIXELXY_MOD_RGB555(x, y);
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41 break;
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42 default:
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43 DRAW_SETPIXELXY_RGB555(x, y);
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44 break;
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45 }
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46 return 0;
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47 }
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48
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49 static int
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50 SDL_BlendPoint_RGB565(SDL_Surface * dst, int x, int y, int blendMode, Uint8 r,
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51 Uint8 g, Uint8 b, Uint8 a)
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52 {
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53 unsigned inva = 0xff - a;
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54
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55 switch (blendMode) {
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56 case SDL_BLENDMODE_BLEND:
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57 DRAW_SETPIXELXY_BLEND_RGB565(x, y);
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58 break;
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59 case SDL_BLENDMODE_ADD:
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60 DRAW_SETPIXELXY_ADD_RGB565(x, y);
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61 break;
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62 case SDL_BLENDMODE_MOD:
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63 DRAW_SETPIXELXY_MOD_RGB565(x, y);
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64 break;
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65 default:
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66 DRAW_SETPIXELXY_RGB565(x, y);
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67 break;
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68 }
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69 return 0;
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70 }
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71
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72 static int
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73 SDL_BlendPoint_RGB888(SDL_Surface * dst, int x, int y, int blendMode, Uint8 r,
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74 Uint8 g, Uint8 b, Uint8 a)
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75 {
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76 unsigned inva = 0xff - a;
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77
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78 switch (blendMode) {
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79 case SDL_BLENDMODE_BLEND:
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80 DRAW_SETPIXELXY_BLEND_RGB888(x, y);
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81 break;
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82 case SDL_BLENDMODE_ADD:
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83 DRAW_SETPIXELXY_ADD_RGB888(x, y);
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84 break;
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85 case SDL_BLENDMODE_MOD:
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86 DRAW_SETPIXELXY_MOD_RGB888(x, y);
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87 break;
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88 default:
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89 DRAW_SETPIXELXY_RGB888(x, y);
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90 break;
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91 }
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92 return 0;
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93 }
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94
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95 static int
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96 SDL_BlendPoint_ARGB8888(SDL_Surface * dst, int x, int y, int blendMode,
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97 Uint8 r, Uint8 g, Uint8 b, Uint8 a)
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98 {
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99 unsigned inva = 0xff - a;
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100
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101 switch (blendMode) {
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102 case SDL_BLENDMODE_BLEND:
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103 DRAW_SETPIXELXY_BLEND_ARGB8888(x, y);
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104 break;
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105 case SDL_BLENDMODE_ADD:
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106 DRAW_SETPIXELXY_ADD_ARGB8888(x, y);
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107 break;
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108 case SDL_BLENDMODE_MOD:
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109 DRAW_SETPIXELXY_MOD_ARGB8888(x, y);
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110 break;
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111 default:
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112 DRAW_SETPIXELXY_ARGB8888(x, y);
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113 break;
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114 }
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115 return 0;
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116 }
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117
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118 static int
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119 SDL_BlendPoint_RGB(SDL_Surface * dst, int x, int y, int blendMode, Uint8 r,
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120 Uint8 g, Uint8 b, Uint8 a)
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121 {
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122 SDL_PixelFormat *fmt = dst->format;
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123 unsigned inva = 0xff - a;
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124
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125 switch (fmt->BytesPerPixel) {
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126 case 2:
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127 switch (blendMode) {
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128 case SDL_BLENDMODE_BLEND:
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129 DRAW_SETPIXELXY2_BLEND_RGB(x, y);
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130 break;
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131 case SDL_BLENDMODE_ADD:
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132 DRAW_SETPIXELXY2_ADD_RGB(x, y);
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133 break;
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134 case SDL_BLENDMODE_MOD:
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135 DRAW_SETPIXELXY2_MOD_RGB(x, y);
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136 break;
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137 default:
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138 DRAW_SETPIXELXY2_RGB(x, y);
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139 break;
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140 }
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141 return 0;
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142 case 4:
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143 switch (blendMode) {
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144 case SDL_BLENDMODE_BLEND:
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145 DRAW_SETPIXELXY4_BLEND_RGB(x, y);
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146 break;
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147 case SDL_BLENDMODE_ADD:
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148 DRAW_SETPIXELXY4_ADD_RGB(x, y);
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149 break;
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150 case SDL_BLENDMODE_MOD:
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151 DRAW_SETPIXELXY4_MOD_RGB(x, y);
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152 break;
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153 default:
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154 DRAW_SETPIXELXY4_RGB(x, y);
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155 break;
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156 }
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157 return 0;
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158 default:
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159 SDL_Unsupported();
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160 return -1;
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161 }
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162 }
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163
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164 static int
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165 SDL_BlendPoint_RGBA(SDL_Surface * dst, int x, int y, int blendMode, Uint8 r,
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166 Uint8 g, Uint8 b, Uint8 a)
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167 {
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168 SDL_PixelFormat *fmt = dst->format;
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169 unsigned inva = 0xff - a;
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170
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171 switch (fmt->BytesPerPixel) {
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172 case 4:
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173 switch (blendMode) {
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174 case SDL_BLENDMODE_BLEND:
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175 DRAW_SETPIXELXY4_BLEND_RGBA(x, y);
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176 break;
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177 case SDL_BLENDMODE_ADD:
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178 DRAW_SETPIXELXY4_ADD_RGBA(x, y);
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179 break;
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180 case SDL_BLENDMODE_MOD:
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181 DRAW_SETPIXELXY4_MOD_RGBA(x, y);
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182 break;
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183 default:
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184 DRAW_SETPIXELXY4_RGBA(x, y);
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185 break;
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186 }
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187 return 0;
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188 default:
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189 SDL_Unsupported();
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190 return -1;
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191 }
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192 }
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193
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194 int
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195 SDL_BlendPoint(SDL_Surface * dst, int x, int y, int blendMode, Uint8 r,
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196 Uint8 g, Uint8 b, Uint8 a)
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197 {
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198 SDL_PixelFormat *fmt = dst->format;
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199
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200 /* This function doesn't work on surfaces < 8 bpp */
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201 if (dst->format->BitsPerPixel < 8) {
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202 SDL_SetError("SDL_BlendPoint(): Unsupported surface format");
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203 return (-1);
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204 }
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205
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206 /* Perform clipping */
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207 if (x < dst->clip_rect.x || y < dst->clip_rect.y ||
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208 x >= (dst->clip_rect.x + dst->clip_rect.w) ||
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209 y >= (dst->clip_rect.y + dst->clip_rect.h)) {
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210 return 0;
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211 }
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212
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213 if ((blendMode == SDL_BLENDMODE_BLEND)
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214 || (blendMode == SDL_BLENDMODE_ADD)) {
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215 r = DRAW_MUL(r, a);
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216 g = DRAW_MUL(g, a);
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217 b = DRAW_MUL(b, a);
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218 }
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219
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220 switch (fmt->BitsPerPixel) {
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221 case 15:
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222 switch (fmt->Rmask) {
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223 case 0x7C00:
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224 return SDL_BlendPoint_RGB555(dst, x, y, blendMode, r, g, b, a);
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225 }
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226 break;
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227 case 16:
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228 switch (fmt->Rmask) {
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229 case 0xF800:
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230 return SDL_BlendPoint_RGB565(dst, x, y, blendMode, r, g, b, a);
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231 }
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232 break;
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233 case 32:
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234 switch (fmt->Rmask) {
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235 case 0x00FF0000:
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236 if (!fmt->Amask) {
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237 return SDL_BlendPoint_RGB888(dst, x, y, blendMode, r, g, b,
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238 a);
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239 } else {
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240 return SDL_BlendPoint_ARGB8888(dst, x, y, blendMode, r, g, b,
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241 a);
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242 }
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243 break;
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244 }
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245 default:
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246 break;
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247 }
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248
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249 if (!fmt->Amask) {
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250 return SDL_BlendPoint_RGB(dst, x, y, blendMode, r, g, b, a);
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251 } else {
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252 return SDL_BlendPoint_RGBA(dst, x, y, blendMode, r, g, b, a);
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253 }
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254 }
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255
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256 /* vi: set ts=4 sw=4 expandtab: */
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