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annotate src/video/SDL_draw.h @ 2900:3a9636c83849

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Make it possible to switch algorithms in the future
author Sam Lantinga <slouken@libsdl.org>
date Sun, 21 Dec 2008 08:59:56 +0000
parents a0c837a16e4c
children 133601e3b255
rev   line source
2898
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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_blit.h"
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25
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26 /* This code assumes that r, g, b, a are the source color,
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27 * and in the blend and add case, the RGB values are premultiplied by a.
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28 */
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29
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30 #define DRAW_MUL(_a, _b) (((unsigned)(_a)*(_b))/255)
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31
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32 #define DRAW_SETPIXEL(setpixel) \
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33 do { \
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34 unsigned sr = r, sg = g, sb = b, sa = a; \
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35 setpixel; \
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36 } while (0)
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37
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38 #define DRAW_SETPIXEL_BLEND(getpixel, setpixel) \
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39 do { \
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40 unsigned sr, sg, sb, sa; sa; \
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41 getpixel; \
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42 sr = DRAW_MUL(inva, sr) + r; \
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43 sg = DRAW_MUL(inva, sg) + g; \
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44 sb = DRAW_MUL(inva, sb) + b; \
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45 setpixel; \
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46 } while (0)
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47
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48 #define DRAW_SETPIXEL_ADD(getpixel, setpixel) \
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49 do { \
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50 unsigned sr, sg, sb, sa; sa; \
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51 getpixel; \
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52 sr += r; if (sr > 0xff) sr = 0xff; \
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53 sg += g; if (sg > 0xff) sg = 0xff; \
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54 sb += b; if (sb > 0xff) sb = 0xff; \
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55 setpixel; \
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56 } while (0)
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57
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58 #define DRAW_SETPIXEL_MOD(getpixel, setpixel) \
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59 do { \
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60 unsigned sr, sg, sb, sa; sa; \
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61 getpixel; \
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62 sr = DRAW_MUL(sr, r); \
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63 sg = DRAW_MUL(sg, g); \
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64 sb = DRAW_MUL(sb, b); \
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65 setpixel; \
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66 } while (0)
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67
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68 #define DRAW_SETPIXELXY(x, y, type, bpp, op) \
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69 do { \
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70 type *pixel = (type *)(dst->pixels + y * dst->pitch + x * bpp); \
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71 op; \
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72 } while (0)
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73
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74 /*
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75 * Define draw operators for RGB555
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76 */
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77
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78 #define DRAW_SETPIXEL_RGB555 \
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79 DRAW_SETPIXEL(RGB555_FROM_RGB(*pixel, sr, sg, sb))
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80
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81 #define DRAW_SETPIXEL_BLEND_RGB555 \
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82 DRAW_SETPIXEL_BLEND(RGB_FROM_RGB555(*pixel, sr, sg, sb), \
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83 RGB555_FROM_RGB(*pixel, sr, sg, sb))
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84
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85 #define DRAW_SETPIXEL_ADD_RGB555 \
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86 DRAW_SETPIXEL_ADD(RGB_FROM_RGB555(*pixel, sr, sg, sb), \
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87 RGB555_FROM_RGB(*pixel, sr, sg, sb))
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88
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89 #define DRAW_SETPIXEL_MOD_RGB555 \
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90 DRAW_SETPIXEL_MOD(RGB_FROM_RGB555(*pixel, sr, sg, sb), \
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91 RGB555_FROM_RGB(*pixel, sr, sg, sb))
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92
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93 #define DRAW_SETPIXELXY_RGB555(x, y) \
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94 DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_RGB555)
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95
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96 #define DRAW_SETPIXELXY_BLEND_RGB555(x, y) \
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97 DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_BLEND_RGB555)
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98
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99 #define DRAW_SETPIXELXY_ADD_RGB555(x, y) \
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100 DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_ADD_RGB555)
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101
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102 #define DRAW_SETPIXELXY_MOD_RGB555(x, y) \
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103 DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_MOD_RGB555)
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104
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105 /*
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106 * Define draw operators for RGB565
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107 */
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108
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109 #define DRAW_SETPIXEL_RGB565 \
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110 DRAW_SETPIXEL(RGB565_FROM_RGB(*pixel, sr, sg, sb))
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111
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112 #define DRAW_SETPIXEL_BLEND_RGB565 \
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113 DRAW_SETPIXEL_BLEND(RGB_FROM_RGB565(*pixel, sr, sg, sb), \
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114 RGB565_FROM_RGB(*pixel, sr, sg, sb))
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115
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116 #define DRAW_SETPIXEL_ADD_RGB565 \
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117 DRAW_SETPIXEL_ADD(RGB_FROM_RGB565(*pixel, sr, sg, sb), \
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118 RGB565_FROM_RGB(*pixel, sr, sg, sb))
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119
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120 #define DRAW_SETPIXEL_MOD_RGB565 \
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121 DRAW_SETPIXEL_MOD(RGB_FROM_RGB565(*pixel, sr, sg, sb), \
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122 RGB565_FROM_RGB(*pixel, sr, sg, sb))
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123
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124 #define DRAW_SETPIXELXY_RGB565(x, y) \
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125 DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_RGB565)
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126
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127 #define DRAW_SETPIXELXY_BLEND_RGB565(x, y) \
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128 DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_BLEND_RGB565)
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129
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130 #define DRAW_SETPIXELXY_ADD_RGB565(x, y) \
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131 DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_ADD_RGB565)
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132
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133 #define DRAW_SETPIXELXY_MOD_RGB565(x, y) \
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134 DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_MOD_RGB565)
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135
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136 /*
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137 * Define draw operators for RGB888
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138 */
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139
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140 #define DRAW_SETPIXEL_RGB888 \
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141 DRAW_SETPIXEL(RGB888_FROM_RGB(*pixel, sr, sg, sb))
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142
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143 #define DRAW_SETPIXEL_BLEND_RGB888 \
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144 DRAW_SETPIXEL_BLEND(RGB_FROM_RGB888(*pixel, sr, sg, sb), \
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145 RGB888_FROM_RGB(*pixel, sr, sg, sb))
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146
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147 #define DRAW_SETPIXEL_ADD_RGB888 \
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148 DRAW_SETPIXEL_ADD(RGB_FROM_RGB888(*pixel, sr, sg, sb), \
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149 RGB888_FROM_RGB(*pixel, sr, sg, sb))
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150
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151 #define DRAW_SETPIXEL_MOD_RGB888 \
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152 DRAW_SETPIXEL_MOD(RGB_FROM_RGB888(*pixel, sr, sg, sb), \
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153 RGB888_FROM_RGB(*pixel, sr, sg, sb))
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154
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155 #define DRAW_SETPIXELXY_RGB888(x, y) \
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156 DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_RGB888)
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157
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158 #define DRAW_SETPIXELXY_BLEND_RGB888(x, y) \
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159 DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_BLEND_RGB888)
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160
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161 #define DRAW_SETPIXELXY_ADD_RGB888(x, y) \
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162 DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_ADD_RGB888)
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163
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164 #define DRAW_SETPIXELXY_MOD_RGB888(x, y) \
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165 DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_MOD_RGB888)
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166
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167 /*
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168 * Define draw operators for ARGB8888
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169 */
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170
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171 #define DRAW_SETPIXEL_ARGB8888 \
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172 DRAW_SETPIXEL(ARGB8888_FROM_RGBA(*pixel, sr, sg, sb, sa))
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173
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174 #define DRAW_SETPIXEL_BLEND_ARGB8888 \
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175 DRAW_SETPIXEL_BLEND(RGBA_FROM_ARGB8888(*pixel, sr, sg, sb, sa), \
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176 ARGB8888_FROM_RGBA(*pixel, sr, sg, sb, sa))
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177
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178 #define DRAW_SETPIXEL_ADD_ARGB8888 \
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179 DRAW_SETPIXEL_ADD(RGBA_FROM_ARGB8888(*pixel, sr, sg, sb, sa), \
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180 ARGB8888_FROM_RGBA(*pixel, sr, sg, sb, sa))
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181
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182 #define DRAW_SETPIXEL_MOD_ARGB8888 \
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183 DRAW_SETPIXEL_MOD(RGBA_FROM_ARGB8888(*pixel, sr, sg, sb, sa), \
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184 ARGB8888_FROM_RGBA(*pixel, sr, sg, sb, sa))
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185
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186 #define DRAW_SETPIXELXY_ARGB8888(x, y) \
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187 DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_ARGB8888)
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188
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189 #define DRAW_SETPIXELXY_BLEND_ARGB8888(x, y) \
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190 DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_BLEND_ARGB8888)
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191
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192 #define DRAW_SETPIXELXY_ADD_ARGB8888(x, y) \
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193 DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_ADD_ARGB8888)
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194
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195 #define DRAW_SETPIXELXY_MOD_ARGB8888(x, y) \
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196 DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_MOD_ARGB8888)
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197
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198 /*
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199 * Define draw operators for general RGB
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200 */
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201
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202 #define DRAW_SETPIXEL_RGB \
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203 DRAW_SETPIXEL(PIXEL_FROM_RGB(*pixel, fmt, sr, sg, sb))
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204
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205 #define DRAW_SETPIXEL_BLEND_RGB \
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206 DRAW_SETPIXEL_BLEND(RGB_FROM_PIXEL(*pixel, fmt, sr, sg, sb), \
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207 PIXEL_FROM_RGB(*pixel, fmt, sr, sg, sb))
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208
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209 #define DRAW_SETPIXEL_ADD_RGB \
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210 DRAW_SETPIXEL_ADD(RGB_FROM_PIXEL(*pixel, fmt, sr, sg, sb), \
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211 PIXEL_FROM_RGB(*pixel, fmt, sr, sg, sb))
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212
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213 #define DRAW_SETPIXEL_MOD_RGB \
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214 DRAW_SETPIXEL_MOD(RGB_FROM_PIXEL(*pixel, fmt, sr, sg, sb), \
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215 PIXEL_FROM_RGB(*pixel, fmt, sr, sg, sb))
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216
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217 #define DRAW_SETPIXELXY2_RGB(x, y) \
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218 DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_RGB)
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219
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220 #define DRAW_SETPIXELXY4_RGB(x, y) \
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221 DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_RGB)
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222
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223 #define DRAW_SETPIXELXY2_BLEND_RGB(x, y) \
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224 DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_BLEND_RGB)
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225
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226 #define DRAW_SETPIXELXY4_BLEND_RGB(x, y) \
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227 DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_BLEND_RGB)
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228
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229 #define DRAW_SETPIXELXY2_ADD_RGB(x, y) \
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230 DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_ADD_RGB)
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231
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232 #define DRAW_SETPIXELXY4_ADD_RGB(x, y) \
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233 DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_ADD_RGB)
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234
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235 #define DRAW_SETPIXELXY2_MOD_RGB(x, y) \
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236 DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_MOD_RGB)
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237
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238 #define DRAW_SETPIXELXY4_MOD_RGB(x, y) \
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239 DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_MOD_RGB)
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240
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241
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242 /*
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243 * Define draw operators for general RGBA
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244 */
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245
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246 #define DRAW_SETPIXEL_RGBA \
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247 DRAW_SETPIXEL(PIXEL_FROM_RGBA(*pixel, fmt, sr, sg, sb, sa))
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248
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249 #define DRAW_SETPIXEL_BLEND_RGBA \
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250 DRAW_SETPIXEL_BLEND(RGBA_FROM_PIXEL(*pixel, fmt, sr, sg, sb, sa), \
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251 PIXEL_FROM_RGBA(*pixel, fmt, sr, sg, sb, sa))
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252
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253 #define DRAW_SETPIXEL_ADD_RGBA \
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254 DRAW_SETPIXEL_ADD(RGBA_FROM_PIXEL(*pixel, fmt, sr, sg, sb, sa), \
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255 PIXEL_FROM_RGBA(*pixel, fmt, sr, sg, sb, sa))
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256
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257 #define DRAW_SETPIXEL_MOD_RGBA \
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258 DRAW_SETPIXEL_MOD(RGBA_FROM_PIXEL(*pixel, fmt, sr, sg, sb, sa), \
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259 PIXEL_FROM_RGBA(*pixel, fmt, sr, sg, sb, sa))
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260
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261 #define DRAW_SETPIXELXY4_RGBA(x, y) \
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262 DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_RGBA)
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263
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264 #define DRAW_SETPIXELXY4_BLEND_RGBA(x, y) \
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265 DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_BLEND_RGBA)
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266
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267 #define DRAW_SETPIXELXY4_ADD_RGBA(x, y) \
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268 DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_ADD_RGBA)
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269
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270 #define DRAW_SETPIXELXY4_MOD_RGBA(x, y) \
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271 DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_MOD_RGBA)
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272
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273 /*
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274 * Define line drawing macro
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275 */
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276
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277 #define ABS(_x) ((_x) < 0 ? -(_x) : (_x))
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278
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279 #define SWAP(_x, _y) do { int tmp; tmp = _x; _x = _y; _y = tmp; } while (0)
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280
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281 #define BRESENHAM(x0, y0, x1, y1, op) \
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282 { \
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283 int deltax, deltay, steep, error, xstep, ystep, x, y; \
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284 \
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285 deltax = ABS(x1 - x0); \
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286 deltay = ABS(y1 - y0); \
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287 steep = (deltay > deltax); \
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288 if (steep) { \
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289 SWAP(x0, y0); \
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290 SWAP(x1, y1); \
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291 SWAP(deltax, deltay); \
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292 } \
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293 error = (x1 - x0) / 2; \
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294 y = y0; \
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295 if (x0 > x1) { \
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296 xstep = -1; \
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297 } else { \
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298 xstep = 1; \
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299 } \
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300 if (y0 < y1) { \
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301 ystep = 1; \
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302 } else { \
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303 ystep = -1; \
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304 } \
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305 if (!steep) { \
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306 for (x = x0; x != x1; x += xstep) { \
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307 op(x, y); \
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308 error -= deltay; \
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309 if (error < 0) { \
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310 y += ystep; \
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311 error += deltax; \
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312 } \
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313 } \
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314 } else { \
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315 for (x = x0; x != x1; x += xstep) { \
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316 op(y, x); \
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317 error -= deltay; \
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318 if (error < 0) { \
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319 y += ystep; \
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320 error += deltax; \
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321 } \
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322 } \
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323 } \
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324 }
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325 #define DRAWLINE(x0, y0, x1, y1, op) BRESENHAM(x0, y0, x1, y1, op)
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326
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327 /*
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328 * Define blend fill macro
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329 */
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330
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331 #define FILLRECT(type, op) \
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332 do { \
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333 int w; \
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334 int width = dstrect->w; \
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335 int height = dstrect->h; \
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336 int pitch = (dst->pitch / dst->format->BytesPerPixel); \
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337 int skip = pitch - width; \
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338 type *pixel = (type *)dst->pixels + dstrect->y * pitch + dstrect->x; \
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339 while (height--) { \
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340 { int n = (width+3)/4; \
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341 switch (width & 3) { \
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342 case 0: do { op; pixel++; \
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343 case 3: op; pixel++; \
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344 case 2: op; pixel++; \
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345 case 1: op; pixel++; \
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346 } while ( --n > 0 ); \
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347 } \
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348 } \
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349 pixel += skip; \
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350 } \
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351 } while (0)
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352
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353 /*
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354 * Define blend line macro
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355 */
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356
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357 /* vi: set ts=4 sw=4 expandtab: */