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annotate src/video/SDL_draw.h @ 2903:e426c4fc9cf7

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Working Bresenham line drawing algorithm. We can optimize later, if needed.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 21 Dec 2008 20:16:21 +0000
parents 133601e3b255
children bd518fc76f28
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2009 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_FASTSETPIXEL(x, y, type, bpp, color) \
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33 *(type *)(dst->pixels + y * dst->pitch + x * bpp) = (type) color
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34
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35 #define DRAW_FASTSETPIXEL1(x, y) DRAW_FASTSETPIXEL(x, y, Uint8, 1, color);
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36 #define DRAW_FASTSETPIXEL2(x, y) DRAW_FASTSETPIXEL(x, y, Uint16, 2, color);
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37 #define DRAW_FASTSETPIXEL4(x, y) DRAW_FASTSETPIXEL(x, y, Uint32, 4, color);
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38
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39 #define DRAW_SETPIXEL(setpixel) \
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40 do { \
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41 unsigned sr = r, sg = g, sb = b, sa = a; \
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42 setpixel; \
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43 } while (0)
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44
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45 #define DRAW_SETPIXEL_BLEND(getpixel, setpixel) \
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46 do { \
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47 unsigned sr, sg, sb, sa; sa; \
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48 getpixel; \
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49 sr = DRAW_MUL(inva, sr) + r; \
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50 sg = DRAW_MUL(inva, sg) + g; \
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51 sb = DRAW_MUL(inva, sb) + b; \
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52 setpixel; \
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53 } while (0)
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54
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55 #define DRAW_SETPIXEL_ADD(getpixel, setpixel) \
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56 do { \
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57 unsigned sr, sg, sb, sa; sa; \
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58 getpixel; \
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59 sr += r; if (sr > 0xff) sr = 0xff; \
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60 sg += g; if (sg > 0xff) sg = 0xff; \
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61 sb += b; if (sb > 0xff) sb = 0xff; \
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62 setpixel; \
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63 } while (0)
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64
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65 #define DRAW_SETPIXEL_MOD(getpixel, setpixel) \
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66 do { \
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67 unsigned sr, sg, sb, sa; sa; \
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68 getpixel; \
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69 sr = DRAW_MUL(sr, r); \
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70 sg = DRAW_MUL(sg, g); \
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71 sb = DRAW_MUL(sb, b); \
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72 setpixel; \
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73 } while (0)
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74
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75 #define DRAW_SETPIXELXY(x, y, type, bpp, op) \
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76 do { \
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77 type *pixel = (type *)(dst->pixels + y * dst->pitch + x * bpp); \
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78 op; \
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79 } while (0)
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80
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81 /*
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82 * Define draw operators for RGB555
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83 */
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84
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85 #define DRAW_SETPIXEL_RGB555 \
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86 DRAW_SETPIXEL(RGB555_FROM_RGB(*pixel, sr, sg, sb))
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87
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88 #define DRAW_SETPIXEL_BLEND_RGB555 \
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89 DRAW_SETPIXEL_BLEND(RGB_FROM_RGB555(*pixel, sr, sg, sb), \
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90 RGB555_FROM_RGB(*pixel, sr, sg, sb))
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91
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92 #define DRAW_SETPIXEL_ADD_RGB555 \
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93 DRAW_SETPIXEL_ADD(RGB_FROM_RGB555(*pixel, sr, sg, sb), \
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94 RGB555_FROM_RGB(*pixel, sr, sg, sb))
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95
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96 #define DRAW_SETPIXEL_MOD_RGB555 \
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97 DRAW_SETPIXEL_MOD(RGB_FROM_RGB555(*pixel, sr, sg, sb), \
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98 RGB555_FROM_RGB(*pixel, sr, sg, sb))
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99
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100 #define DRAW_SETPIXELXY_RGB555(x, y) \
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101 DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_RGB555)
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102
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103 #define DRAW_SETPIXELXY_BLEND_RGB555(x, y) \
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104 DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_BLEND_RGB555)
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105
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106 #define DRAW_SETPIXELXY_ADD_RGB555(x, y) \
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107 DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_ADD_RGB555)
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108
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109 #define DRAW_SETPIXELXY_MOD_RGB555(x, y) \
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110 DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_MOD_RGB555)
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111
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112 /*
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113 * Define draw operators for RGB565
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114 */
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115
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116 #define DRAW_SETPIXEL_RGB565 \
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117 DRAW_SETPIXEL(RGB565_FROM_RGB(*pixel, sr, sg, sb))
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118
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119 #define DRAW_SETPIXEL_BLEND_RGB565 \
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120 DRAW_SETPIXEL_BLEND(RGB_FROM_RGB565(*pixel, sr, sg, sb), \
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121 RGB565_FROM_RGB(*pixel, sr, sg, sb))
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122
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123 #define DRAW_SETPIXEL_ADD_RGB565 \
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124 DRAW_SETPIXEL_ADD(RGB_FROM_RGB565(*pixel, sr, sg, sb), \
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125 RGB565_FROM_RGB(*pixel, sr, sg, sb))
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126
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127 #define DRAW_SETPIXEL_MOD_RGB565 \
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128 DRAW_SETPIXEL_MOD(RGB_FROM_RGB565(*pixel, sr, sg, sb), \
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129 RGB565_FROM_RGB(*pixel, sr, sg, sb))
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130
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131 #define DRAW_SETPIXELXY_RGB565(x, y) \
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132 DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_RGB565)
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133
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134 #define DRAW_SETPIXELXY_BLEND_RGB565(x, y) \
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135 DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_BLEND_RGB565)
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136
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137 #define DRAW_SETPIXELXY_ADD_RGB565(x, y) \
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138 DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_ADD_RGB565)
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139
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140 #define DRAW_SETPIXELXY_MOD_RGB565(x, y) \
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141 DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_MOD_RGB565)
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142
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143 /*
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144 * Define draw operators for RGB888
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145 */
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146
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147 #define DRAW_SETPIXEL_RGB888 \
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148 DRAW_SETPIXEL(RGB888_FROM_RGB(*pixel, sr, sg, sb))
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149
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150 #define DRAW_SETPIXEL_BLEND_RGB888 \
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151 DRAW_SETPIXEL_BLEND(RGB_FROM_RGB888(*pixel, sr, sg, sb), \
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152 RGB888_FROM_RGB(*pixel, sr, sg, sb))
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153
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154 #define DRAW_SETPIXEL_ADD_RGB888 \
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155 DRAW_SETPIXEL_ADD(RGB_FROM_RGB888(*pixel, sr, sg, sb), \
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156 RGB888_FROM_RGB(*pixel, sr, sg, sb))
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157
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158 #define DRAW_SETPIXEL_MOD_RGB888 \
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159 DRAW_SETPIXEL_MOD(RGB_FROM_RGB888(*pixel, sr, sg, sb), \
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160 RGB888_FROM_RGB(*pixel, sr, sg, sb))
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161
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162 #define DRAW_SETPIXELXY_RGB888(x, y) \
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163 DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_RGB888)
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164
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165 #define DRAW_SETPIXELXY_BLEND_RGB888(x, y) \
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166 DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_BLEND_RGB888)
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167
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168 #define DRAW_SETPIXELXY_ADD_RGB888(x, y) \
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169 DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_ADD_RGB888)
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170
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171 #define DRAW_SETPIXELXY_MOD_RGB888(x, y) \
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172 DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_MOD_RGB888)
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173
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174 /*
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175 * Define draw operators for ARGB8888
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176 */
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177
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178 #define DRAW_SETPIXEL_ARGB8888 \
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179 DRAW_SETPIXEL(ARGB8888_FROM_RGBA(*pixel, sr, sg, sb, sa))
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180
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181 #define DRAW_SETPIXEL_BLEND_ARGB8888 \
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182 DRAW_SETPIXEL_BLEND(RGBA_FROM_ARGB8888(*pixel, sr, sg, sb, sa), \
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183 ARGB8888_FROM_RGBA(*pixel, sr, sg, sb, sa))
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184
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185 #define DRAW_SETPIXEL_ADD_ARGB8888 \
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186 DRAW_SETPIXEL_ADD(RGBA_FROM_ARGB8888(*pixel, sr, sg, sb, sa), \
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187 ARGB8888_FROM_RGBA(*pixel, sr, sg, sb, sa))
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188
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189 #define DRAW_SETPIXEL_MOD_ARGB8888 \
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190 DRAW_SETPIXEL_MOD(RGBA_FROM_ARGB8888(*pixel, sr, sg, sb, sa), \
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191 ARGB8888_FROM_RGBA(*pixel, sr, sg, sb, sa))
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192
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193 #define DRAW_SETPIXELXY_ARGB8888(x, y) \
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194 DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_ARGB8888)
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195
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196 #define DRAW_SETPIXELXY_BLEND_ARGB8888(x, y) \
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197 DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_BLEND_ARGB8888)
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198
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199 #define DRAW_SETPIXELXY_ADD_ARGB8888(x, y) \
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200 DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_ADD_ARGB8888)
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201
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202 #define DRAW_SETPIXELXY_MOD_ARGB8888(x, y) \
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203 DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_MOD_ARGB8888)
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204
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205 /*
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206 * Define draw operators for general RGB
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207 */
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208
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209 #define DRAW_SETPIXEL_RGB \
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210 DRAW_SETPIXEL(PIXEL_FROM_RGB(*pixel, fmt, sr, sg, sb))
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211
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212 #define DRAW_SETPIXEL_BLEND_RGB \
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213 DRAW_SETPIXEL_BLEND(RGB_FROM_PIXEL(*pixel, fmt, sr, sg, sb), \
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214 PIXEL_FROM_RGB(*pixel, fmt, sr, sg, sb))
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215
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216 #define DRAW_SETPIXEL_ADD_RGB \
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217 DRAW_SETPIXEL_ADD(RGB_FROM_PIXEL(*pixel, fmt, sr, sg, sb), \
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218 PIXEL_FROM_RGB(*pixel, fmt, sr, sg, sb))
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219
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220 #define DRAW_SETPIXEL_MOD_RGB \
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221 DRAW_SETPIXEL_MOD(RGB_FROM_PIXEL(*pixel, fmt, sr, sg, sb), \
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222 PIXEL_FROM_RGB(*pixel, fmt, sr, sg, sb))
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223
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224 #define DRAW_SETPIXELXY2_RGB(x, y) \
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225 DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_RGB)
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226
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227 #define DRAW_SETPIXELXY4_RGB(x, y) \
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228 DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_RGB)
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229
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230 #define DRAW_SETPIXELXY2_BLEND_RGB(x, y) \
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231 DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_BLEND_RGB)
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232
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233 #define DRAW_SETPIXELXY4_BLEND_RGB(x, y) \
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234 DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_BLEND_RGB)
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235
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236 #define DRAW_SETPIXELXY2_ADD_RGB(x, y) \
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237 DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_ADD_RGB)
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238
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239 #define DRAW_SETPIXELXY4_ADD_RGB(x, y) \
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240 DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_ADD_RGB)
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241
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242 #define DRAW_SETPIXELXY2_MOD_RGB(x, y) \
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243 DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_MOD_RGB)
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244
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245 #define DRAW_SETPIXELXY4_MOD_RGB(x, y) \
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246 DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_MOD_RGB)
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247
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248
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249 /*
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250 * Define draw operators for general RGBA
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251 */
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252
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253 #define DRAW_SETPIXEL_RGBA \
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254 DRAW_SETPIXEL(PIXEL_FROM_RGBA(*pixel, fmt, sr, sg, sb, sa))
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255
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256 #define DRAW_SETPIXEL_BLEND_RGBA \
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257 DRAW_SETPIXEL_BLEND(RGBA_FROM_PIXEL(*pixel, fmt, sr, sg, sb, sa), \
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258 PIXEL_FROM_RGBA(*pixel, fmt, sr, sg, sb, sa))
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259
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260 #define DRAW_SETPIXEL_ADD_RGBA \
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261 DRAW_SETPIXEL_ADD(RGBA_FROM_PIXEL(*pixel, fmt, sr, sg, sb, sa), \
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262 PIXEL_FROM_RGBA(*pixel, fmt, sr, sg, sb, sa))
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263
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264 #define DRAW_SETPIXEL_MOD_RGBA \
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265 DRAW_SETPIXEL_MOD(RGBA_FROM_PIXEL(*pixel, fmt, sr, sg, sb, sa), \
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266 PIXEL_FROM_RGBA(*pixel, fmt, sr, sg, sb, sa))
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267
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268 #define DRAW_SETPIXELXY4_RGBA(x, y) \
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269 DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_RGBA)
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270
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271 #define DRAW_SETPIXELXY4_BLEND_RGBA(x, y) \
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272 DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_BLEND_RGBA)
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273
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274 #define DRAW_SETPIXELXY4_ADD_RGBA(x, y) \
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275 DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_ADD_RGBA)
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276
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277 #define DRAW_SETPIXELXY4_MOD_RGBA(x, y) \
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278 DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_MOD_RGBA)
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279
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280 /*
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281 * Define line drawing macro
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282 */
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283
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284 #define ABS(_x) ((_x) < 0 ? -(_x) : (_x))
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285
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286 #define BRESENHAM(x1, y1, x2, y2, op) \
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287 { \
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288 int i, deltax, deltay, numpixels; \
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289 int d, dinc1, dinc2; \
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290 int x, xinc1, xinc2; \
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291 int y, yinc1, yinc2; \
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292 \
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293 deltax = ABS(x2 - x1); \
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294 deltay = ABS(y2 - y1); \
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295 \
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296 if (deltax >= deltay) { \
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297 numpixels = deltax + 1; \
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298 d = (2 * deltay) - deltax; \
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299 dinc1 = deltay * 2; \
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300 dinc2 = (deltay - deltax) * 2; \
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301 xinc1 = 1; \
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302 xinc2 = 1; \
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303 yinc1 = 0; \
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304 yinc2 = 1; \
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305 } else { \
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306 numpixels = deltay + 1; \
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307 d = (2 * deltax) - deltay; \
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308 dinc1 = deltax * 2; \
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309 dinc2 = (deltax - deltay) * 2; \
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310 xinc1 = 0; \
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311 xinc2 = 1; \
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312 yinc1 = 1; \
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313 yinc2 = 1; \
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314 } \
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315 \
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316 if (x1 > x2) { \
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317 xinc1 = -xinc1; \
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318 xinc2 = -xinc2; \
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319 } \
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320 if (y1 > y2) { \
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321 yinc1 = -yinc1; \
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322 yinc2 = -yinc2; \
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323 } \
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324 \
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325 x = x1; \
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326 y = y1; \
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327 \
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328 for (i = 1; i < numpixels; ++i) { \
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329 op(x, y); \
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330 if (d < 0) { \
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331 d += dinc1; \
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332 x += xinc1; \
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333 y += yinc1; \
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334 } else { \
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335 d += dinc2; \
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336 x += xinc2; \
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337 y += yinc2; \
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338 } \
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339 } \
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340 }
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341 #define DRAWLINE(x0, y0, x1, y1, op) BRESENHAM(x0, y0, x1, y1, op)
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342
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343 /*
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344 * Define blend fill macro
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345 */
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346
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347 #define FILLRECT(type, op) \
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348 do { \
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349 int w; \
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350 int width = dstrect->w; \
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351 int height = dstrect->h; \
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352 int pitch = (dst->pitch / dst->format->BytesPerPixel); \
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353 int skip = pitch - width; \
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354 type *pixel = (type *)dst->pixels + dstrect->y * pitch + dstrect->x; \
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355 while (height--) { \
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356 { int n = (width+3)/4; \
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357 switch (width & 3) { \
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358 case 0: do { op; pixel++; \
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359 case 3: op; pixel++; \
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360 case 2: op; pixel++; \
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361 case 1: op; pixel++; \
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362 } while ( --n > 0 ); \
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363 } \
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364 } \
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365 pixel += skip; \
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366 } \
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367 } while (0)
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368
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369 /*
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370 * Define blend line macro
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371 */
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372
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373 /* vi: set ts=4 sw=4 expandtab: */