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annotate src/video/SDL_draw.h @ 4605:0b3a509c53a0

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Respect environment variables.
author Sunny Sachanandani <sunnysachanandani@gmail.com>
date Mon, 19 Jul 2010 21:02:49 +0530
parents f7b03b6838cb
children e743b9c3f6d6
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2010 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(type) \
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33 *pixel = (type) color
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34
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35 #define DRAW_FASTSETPIXEL1 DRAW_FASTSETPIXEL(Uint8)
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36 #define DRAW_FASTSETPIXEL2 DRAW_FASTSETPIXEL(Uint16)
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37 #define DRAW_FASTSETPIXEL4 DRAW_FASTSETPIXEL(Uint32)
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38
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39 #define DRAW_FASTSETPIXELXY(x, y, type, bpp, color) \
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40 *(type *)((Uint8 *)dst->pixels + (y) * dst->pitch \
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41 + (x) * bpp) = (type) color
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42
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43 #define DRAW_FASTSETPIXELXY1(x, y) DRAW_FASTSETPIXELXY(x, y, Uint8, 1, color)
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44 #define DRAW_FASTSETPIXELXY2(x, y) DRAW_FASTSETPIXELXY(x, y, Uint16, 2, color)
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45 #define DRAW_FASTSETPIXELXY4(x, y) DRAW_FASTSETPIXELXY(x, y, Uint32, 4, color)
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46
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47 #define DRAW_SETPIXEL(setpixel) \
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48 do { \
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49 unsigned sr = r, sg = g, sb = b, sa = a; \
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50 setpixel; \
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51 } while (0)
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52
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53 #define DRAW_SETPIXEL_BLEND(getpixel, setpixel) \
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54 do { \
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55 unsigned sr, sg, sb, sa; sa; \
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56 getpixel; \
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57 sr = DRAW_MUL(inva, sr) + r; \
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58 sg = DRAW_MUL(inva, sg) + g; \
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59 sb = DRAW_MUL(inva, sb) + b; \
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60 setpixel; \
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61 } while (0)
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62
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63 #define DRAW_SETPIXEL_ADD(getpixel, setpixel) \
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64 do { \
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65 unsigned sr, sg, sb, sa; sa; \
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66 getpixel; \
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67 sr += r; if (sr > 0xff) sr = 0xff; \
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68 sg += g; if (sg > 0xff) sg = 0xff; \
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69 sb += b; if (sb > 0xff) sb = 0xff; \
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70 setpixel; \
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71 } while (0)
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72
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73 #define DRAW_SETPIXEL_MOD(getpixel, setpixel) \
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74 do { \
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75 unsigned sr, sg, sb, sa; sa; \
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76 getpixel; \
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77 sr = DRAW_MUL(sr, r); \
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78 sg = DRAW_MUL(sg, g); \
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79 sb = DRAW_MUL(sb, b); \
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80 setpixel; \
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81 } while (0)
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82
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83 #define DRAW_SETPIXELXY(x, y, type, bpp, op) \
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84 do { \
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85 type *pixel = (type *)((Uint8 *)dst->pixels + (y) * dst->pitch \
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86 + (x) * bpp); \
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87 op; \
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88 } while (0)
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89
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90 /*
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91 * Define draw operators for RGB555
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92 */
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93
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94 #define DRAW_SETPIXEL_RGB555 \
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95 DRAW_SETPIXEL(RGB555_FROM_RGB(*pixel, sr, sg, sb))
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96
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97 #define DRAW_SETPIXEL_BLEND_RGB555 \
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98 DRAW_SETPIXEL_BLEND(RGB_FROM_RGB555(*pixel, sr, sg, sb), \
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99 RGB555_FROM_RGB(*pixel, sr, sg, sb))
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100
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101 #define DRAW_SETPIXEL_ADD_RGB555 \
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102 DRAW_SETPIXEL_ADD(RGB_FROM_RGB555(*pixel, sr, sg, sb), \
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103 RGB555_FROM_RGB(*pixel, sr, sg, sb))
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104
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105 #define DRAW_SETPIXEL_MOD_RGB555 \
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106 DRAW_SETPIXEL_MOD(RGB_FROM_RGB555(*pixel, sr, sg, sb), \
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107 RGB555_FROM_RGB(*pixel, sr, sg, sb))
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108
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109 #define DRAW_SETPIXELXY_RGB555(x, y) \
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110 DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_RGB555)
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111
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112 #define DRAW_SETPIXELXY_BLEND_RGB555(x, y) \
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113 DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_BLEND_RGB555)
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114
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115 #define DRAW_SETPIXELXY_ADD_RGB555(x, y) \
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116 DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_ADD_RGB555)
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117
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118 #define DRAW_SETPIXELXY_MOD_RGB555(x, y) \
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119 DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_MOD_RGB555)
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120
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121 /*
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122 * Define draw operators for RGB565
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123 */
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124
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125 #define DRAW_SETPIXEL_RGB565 \
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126 DRAW_SETPIXEL(RGB565_FROM_RGB(*pixel, sr, sg, sb))
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127
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128 #define DRAW_SETPIXEL_BLEND_RGB565 \
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129 DRAW_SETPIXEL_BLEND(RGB_FROM_RGB565(*pixel, sr, sg, sb), \
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130 RGB565_FROM_RGB(*pixel, sr, sg, sb))
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131
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132 #define DRAW_SETPIXEL_ADD_RGB565 \
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133 DRAW_SETPIXEL_ADD(RGB_FROM_RGB565(*pixel, sr, sg, sb), \
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134 RGB565_FROM_RGB(*pixel, sr, sg, sb))
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135
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136 #define DRAW_SETPIXEL_MOD_RGB565 \
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137 DRAW_SETPIXEL_MOD(RGB_FROM_RGB565(*pixel, sr, sg, sb), \
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138 RGB565_FROM_RGB(*pixel, sr, sg, sb))
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139
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140 #define DRAW_SETPIXELXY_RGB565(x, y) \
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141 DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_RGB565)
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142
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143 #define DRAW_SETPIXELXY_BLEND_RGB565(x, y) \
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144 DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_BLEND_RGB565)
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145
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146 #define DRAW_SETPIXELXY_ADD_RGB565(x, y) \
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147 DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_ADD_RGB565)
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148
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149 #define DRAW_SETPIXELXY_MOD_RGB565(x, y) \
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150 DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_MOD_RGB565)
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151
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152 /*
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153 * Define draw operators for RGB888
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154 */
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155
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156 #define DRAW_SETPIXEL_RGB888 \
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157 DRAW_SETPIXEL(RGB888_FROM_RGB(*pixel, sr, sg, sb))
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158
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159 #define DRAW_SETPIXEL_BLEND_RGB888 \
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160 DRAW_SETPIXEL_BLEND(RGB_FROM_RGB888(*pixel, sr, sg, sb), \
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161 RGB888_FROM_RGB(*pixel, sr, sg, sb))
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162
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163 #define DRAW_SETPIXEL_ADD_RGB888 \
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164 DRAW_SETPIXEL_ADD(RGB_FROM_RGB888(*pixel, sr, sg, sb), \
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165 RGB888_FROM_RGB(*pixel, sr, sg, sb))
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166
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167 #define DRAW_SETPIXEL_MOD_RGB888 \
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168 DRAW_SETPIXEL_MOD(RGB_FROM_RGB888(*pixel, sr, sg, sb), \
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169 RGB888_FROM_RGB(*pixel, sr, sg, sb))
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170
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171 #define DRAW_SETPIXELXY_RGB888(x, y) \
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172 DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_RGB888)
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173
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174 #define DRAW_SETPIXELXY_BLEND_RGB888(x, y) \
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175 DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_BLEND_RGB888)
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176
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177 #define DRAW_SETPIXELXY_ADD_RGB888(x, y) \
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178 DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_ADD_RGB888)
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179
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180 #define DRAW_SETPIXELXY_MOD_RGB888(x, y) \
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181 DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_MOD_RGB888)
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182
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183 /*
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184 * Define draw operators for ARGB8888
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185 */
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186
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187 #define DRAW_SETPIXEL_ARGB8888 \
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188 DRAW_SETPIXEL(ARGB8888_FROM_RGBA(*pixel, sr, sg, sb, sa))
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189
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190 #define DRAW_SETPIXEL_BLEND_ARGB8888 \
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191 DRAW_SETPIXEL_BLEND(RGBA_FROM_ARGB8888(*pixel, sr, sg, sb, sa), \
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192 ARGB8888_FROM_RGBA(*pixel, sr, sg, sb, sa))
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193
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194 #define DRAW_SETPIXEL_ADD_ARGB8888 \
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195 DRAW_SETPIXEL_ADD(RGBA_FROM_ARGB8888(*pixel, sr, sg, sb, sa), \
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196 ARGB8888_FROM_RGBA(*pixel, sr, sg, sb, sa))
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197
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198 #define DRAW_SETPIXEL_MOD_ARGB8888 \
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199 DRAW_SETPIXEL_MOD(RGBA_FROM_ARGB8888(*pixel, sr, sg, sb, sa), \
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200 ARGB8888_FROM_RGBA(*pixel, sr, sg, sb, sa))
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201
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202 #define DRAW_SETPIXELXY_ARGB8888(x, y) \
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203 DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_ARGB8888)
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204
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205 #define DRAW_SETPIXELXY_BLEND_ARGB8888(x, y) \
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206 DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_BLEND_ARGB8888)
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207
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208 #define DRAW_SETPIXELXY_ADD_ARGB8888(x, y) \
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209 DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_ADD_ARGB8888)
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210
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211 #define DRAW_SETPIXELXY_MOD_ARGB8888(x, y) \
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212 DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_MOD_ARGB8888)
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213
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214 /*
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215 * Define draw operators for general RGB
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216 */
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217
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218 #define DRAW_SETPIXEL_RGB \
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219 DRAW_SETPIXEL(PIXEL_FROM_RGB(*pixel, fmt, sr, sg, sb))
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220
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221 #define DRAW_SETPIXEL_BLEND_RGB \
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222 DRAW_SETPIXEL_BLEND(RGB_FROM_PIXEL(*pixel, fmt, sr, sg, sb), \
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223 PIXEL_FROM_RGB(*pixel, fmt, sr, sg, sb))
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224
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225 #define DRAW_SETPIXEL_ADD_RGB \
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226 DRAW_SETPIXEL_ADD(RGB_FROM_PIXEL(*pixel, fmt, sr, sg, sb), \
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227 PIXEL_FROM_RGB(*pixel, fmt, sr, sg, sb))
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228
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229 #define DRAW_SETPIXEL_MOD_RGB \
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230 DRAW_SETPIXEL_MOD(RGB_FROM_PIXEL(*pixel, fmt, sr, sg, sb), \
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231 PIXEL_FROM_RGB(*pixel, fmt, sr, sg, sb))
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232
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233 #define DRAW_SETPIXELXY2_RGB(x, y) \
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234 DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_RGB)
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235
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236 #define DRAW_SETPIXELXY4_RGB(x, y) \
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237 DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_RGB)
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238
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239 #define DRAW_SETPIXELXY2_BLEND_RGB(x, y) \
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240 DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_BLEND_RGB)
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241
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242 #define DRAW_SETPIXELXY4_BLEND_RGB(x, y) \
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243 DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_BLEND_RGB)
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244
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245 #define DRAW_SETPIXELXY2_ADD_RGB(x, y) \
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246 DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_ADD_RGB)
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247
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248 #define DRAW_SETPIXELXY4_ADD_RGB(x, y) \
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249 DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_ADD_RGB)
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250
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251 #define DRAW_SETPIXELXY2_MOD_RGB(x, y) \
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252 DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_MOD_RGB)
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253
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254 #define DRAW_SETPIXELXY4_MOD_RGB(x, y) \
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255 DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_MOD_RGB)
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256
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257
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258 /*
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259 * Define draw operators for general RGBA
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260 */
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261
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262 #define DRAW_SETPIXEL_RGBA \
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263 DRAW_SETPIXEL(PIXEL_FROM_RGBA(*pixel, fmt, sr, sg, sb, sa))
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264
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265 #define DRAW_SETPIXEL_BLEND_RGBA \
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266 DRAW_SETPIXEL_BLEND(RGBA_FROM_PIXEL(*pixel, fmt, sr, sg, sb, sa), \
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267 PIXEL_FROM_RGBA(*pixel, fmt, sr, sg, sb, sa))
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268
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269 #define DRAW_SETPIXEL_ADD_RGBA \
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270 DRAW_SETPIXEL_ADD(RGBA_FROM_PIXEL(*pixel, fmt, sr, sg, sb, sa), \
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271 PIXEL_FROM_RGBA(*pixel, fmt, sr, sg, sb, sa))
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272
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273 #define DRAW_SETPIXEL_MOD_RGBA \
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274 DRAW_SETPIXEL_MOD(RGBA_FROM_PIXEL(*pixel, fmt, sr, sg, sb, sa), \
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275 PIXEL_FROM_RGBA(*pixel, fmt, sr, sg, sb, sa))
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276
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277 #define DRAW_SETPIXELXY4_RGBA(x, y) \
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278 DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_RGBA)
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279
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280 #define DRAW_SETPIXELXY4_BLEND_RGBA(x, y) \
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281 DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_BLEND_RGBA)
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282
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283 #define DRAW_SETPIXELXY4_ADD_RGBA(x, y) \
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284 DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_ADD_RGBA)
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285
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286 #define DRAW_SETPIXELXY4_MOD_RGBA(x, y) \
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287 DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_MOD_RGBA)
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288
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289 /*
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290 * Define line drawing macro
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291 */
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292
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293 #define ABS(_x) ((_x) < 0 ? -(_x) : (_x))
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294
3596
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295 /* Horizontal line */
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296 #define HLINE(type, op, draw_end) \
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297 { \
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298 int length; \
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299 int pitch = (dst->pitch / dst->format->BytesPerPixel); \
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300 type *pixel; \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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diff changeset
301 if (x1 <= x2) { \
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302 pixel = (type *)dst->pixels + y1 * pitch + x1; \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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303 length = draw_end ? (x2-x1+1) : (x2-x1); \
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304 } else { \
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305 pixel = (type *)dst->pixels + y1 * pitch + x2; \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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306 if (!draw_end) { \
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diff changeset
307 ++pixel; \
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diff changeset
308 } \
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diff changeset
309 length = draw_end ? (x1-x2+1) : (x1-x2); \
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310 } \
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diff changeset
311 while (length--) { \
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312 op; \
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313 ++pixel; \
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314 } \
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315 }
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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316
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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317 /* Vertical line */
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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318 #define VLINE(type, op, draw_end) \
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319 { \
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320 int length; \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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321 int pitch = (dst->pitch / dst->format->BytesPerPixel); \
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322 type *pixel; \
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diff changeset
323 if (y1 <= y2) { \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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324 pixel = (type *)dst->pixels + y1 * pitch + x1; \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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325 length = draw_end ? (y2-y1+1) : (y2-y1); \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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diff changeset
326 } else { \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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327 pixel = (type *)dst->pixels + y2 * pitch + x1; \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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328 if (!draw_end) { \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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329 pixel += pitch; \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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330 } \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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331 length = draw_end ? (y1-y2+1) : (y1-y2); \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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332 } \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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diff changeset
333 while (length--) { \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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334 op; \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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335 pixel += pitch; \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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diff changeset
336 } \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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diff changeset
337 }
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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diff changeset
338
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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diff changeset
339 /* Diagonal line */
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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diff changeset
340 #define DLINE(type, op, draw_end) \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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341 { \
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diff changeset
342 int length; \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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343 int pitch = (dst->pitch / dst->format->BytesPerPixel); \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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344 type *pixel; \
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diff changeset
345 if (y1 <= y2) { \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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diff changeset
346 pixel = (type *)dst->pixels + y1 * pitch + x1; \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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347 if (x1 <= x2) { \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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348 ++pitch; \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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349 } else { \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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diff changeset
350 --pitch; \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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diff changeset
351 } \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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352 length = (y2-y1); \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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353 } else { \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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diff changeset
354 pixel = (type *)dst->pixels + y2 * pitch + x2; \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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diff changeset
355 if (x2 <= x1) { \
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diff changeset
356 ++pitch; \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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diff changeset
357 } else { \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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diff changeset
358 --pitch; \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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diff changeset
359 } \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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diff changeset
360 if (!draw_end) { \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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diff changeset
361 pixel += pitch; \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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diff changeset
362 } \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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diff changeset
363 length = (y1-y2); \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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diff changeset
364 } \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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diff changeset
365 if (draw_end) { \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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diff changeset
366 ++length; \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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diff changeset
367 } \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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diff changeset
368 while (length--) { \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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diff changeset
369 op; \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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diff changeset
370 pixel += pitch; \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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parents: 3594
diff changeset
371 } \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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diff changeset
372 }
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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diff changeset
373
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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diff changeset
374 /* Bresenham's line algorithm */
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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diff changeset
375 #define BLINE(x1, y1, x2, y2, op, draw_end) \
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diff changeset
376 { \
2903
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
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diff changeset
377 int i, deltax, deltay, numpixels; \
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diff changeset
378 int d, dinc1, dinc2; \
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diff changeset
379 int x, xinc1, xinc2; \
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diff changeset
380 int y, yinc1, yinc2; \
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diff changeset
381 \
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diff changeset
382 deltax = ABS(x2 - x1); \
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diff changeset
383 deltay = ABS(y2 - y1); \
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diff changeset
384 \
2903
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diff changeset
385 if (deltax >= deltay) { \
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parents: 2901
diff changeset
386 numpixels = deltax + 1; \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
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diff changeset
387 d = (2 * deltay) - deltax; \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
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parents: 2901
diff changeset
388 dinc1 = deltay * 2; \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
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parents: 2901
diff changeset
389 dinc2 = (deltay - deltax) * 2; \
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diff changeset
390 xinc1 = 1; \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
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parents: 2901
diff changeset
391 xinc2 = 1; \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
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parents: 2901
diff changeset
392 yinc1 = 0; \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
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diff changeset
393 yinc2 = 1; \
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diff changeset
394 } else { \
2903
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diff changeset
395 numpixels = deltay + 1; \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
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diff changeset
396 d = (2 * deltax) - deltay; \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
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diff changeset
397 dinc1 = deltax * 2; \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
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diff changeset
398 dinc2 = (deltax - deltay) * 2; \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
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diff changeset
399 xinc1 = 0; \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
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diff changeset
400 xinc2 = 1; \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
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diff changeset
401 yinc1 = 1; \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
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diff changeset
402 yinc2 = 1; \
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parents:
diff changeset
403 } \
2903
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
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parents: 2901
diff changeset
404 \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
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parents: 2901
diff changeset
405 if (x1 > x2) { \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
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parents: 2901
diff changeset
406 xinc1 = -xinc1; \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
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parents: 2901
diff changeset
407 xinc2 = -xinc2; \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
Sam Lantinga <slouken@libsdl.org>
parents: 2901
diff changeset
408 } \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
Sam Lantinga <slouken@libsdl.org>
parents: 2901
diff changeset
409 if (y1 > y2) { \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
Sam Lantinga <slouken@libsdl.org>
parents: 2901
diff changeset
410 yinc1 = -yinc1; \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
Sam Lantinga <slouken@libsdl.org>
parents: 2901
diff changeset
411 yinc2 = -yinc2; \
2898
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
412 } \
2903
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
Sam Lantinga <slouken@libsdl.org>
parents: 2901
diff changeset
413 \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
Sam Lantinga <slouken@libsdl.org>
parents: 2901
diff changeset
414 x = x1; \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
Sam Lantinga <slouken@libsdl.org>
parents: 2901
diff changeset
415 y = y1; \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
Sam Lantinga <slouken@libsdl.org>
parents: 2901
diff changeset
416 \
3594
c8bed77b0386 Added SDL_DrawRect(), SDL_DrawRects(), SDL_BlendRect() and SDL_BlendRects()
Sam Lantinga <slouken@libsdl.org>
parents: 3593
diff changeset
417 if (!draw_end) { \
c8bed77b0386 Added SDL_DrawRect(), SDL_DrawRects(), SDL_BlendRect() and SDL_BlendRects()
Sam Lantinga <slouken@libsdl.org>
parents: 3593
diff changeset
418 --numpixels; \
c8bed77b0386 Added SDL_DrawRect(), SDL_DrawRects(), SDL_BlendRect() and SDL_BlendRects()
Sam Lantinga <slouken@libsdl.org>
parents: 3593
diff changeset
419 } \
3063
9f2482d6662c Fixed off by one error in line drawing code
Sam Lantinga <slouken@libsdl.org>
parents: 2918
diff changeset
420 for (i = 0; i < numpixels; ++i) { \
2903
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
Sam Lantinga <slouken@libsdl.org>
parents: 2901
diff changeset
421 op(x, y); \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
Sam Lantinga <slouken@libsdl.org>
parents: 2901
diff changeset
422 if (d < 0) { \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
Sam Lantinga <slouken@libsdl.org>
parents: 2901
diff changeset
423 d += dinc1; \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
Sam Lantinga <slouken@libsdl.org>
parents: 2901
diff changeset
424 x += xinc1; \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
Sam Lantinga <slouken@libsdl.org>
parents: 2901
diff changeset
425 y += yinc1; \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
Sam Lantinga <slouken@libsdl.org>
parents: 2901
diff changeset
426 } else { \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
Sam Lantinga <slouken@libsdl.org>
parents: 2901
diff changeset
427 d += dinc2; \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
Sam Lantinga <slouken@libsdl.org>
parents: 2901
diff changeset
428 x += xinc2; \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
Sam Lantinga <slouken@libsdl.org>
parents: 2901
diff changeset
429 y += yinc2; \
2898
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
430 } \
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
431 } \
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
432 }
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
433
3596
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
434 /* Xiaolin Wu's line algorithm, based on Michael Abrash's implementation */
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
435 #define WULINE(x1, y1, x2, y2, opaque_op, blend_op, draw_end) \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
436 { \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
437 Uint16 ErrorAdj, ErrorAcc; \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
438 Uint16 ErrorAccTemp, Weighting; \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
439 int DeltaX, DeltaY, Temp, XDir; \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
440 unsigned r, g, b, a, inva; \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
441 \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
442 /* Draw the initial pixel, which is always exactly intersected by \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
443 the line and so needs no weighting */ \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
444 opaque_op(x1, y1); \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
445 \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
446 /* Draw the final pixel, which is always exactly intersected by the line \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
447 and so needs no weighting */ \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
448 if (draw_end) { \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
449 opaque_op(x2, y2); \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
450 } \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
451 \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
452 /* Make sure the line runs top to bottom */ \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
453 if (y1 > y2) { \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
454 Temp = y1; y1 = y2; y2 = Temp; \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
455 Temp = x1; x1 = x2; x2 = Temp; \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
456 } \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
457 DeltaY = y2 - y1; \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
458 \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
459 if ((DeltaX = x2 - x1) >= 0) { \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
460 XDir = 1; \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
461 } else { \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
462 XDir = -1; \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
463 DeltaX = -DeltaX; /* make DeltaX positive */ \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
464 } \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
465 \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
466 /* line is not horizontal, diagonal, or vertical */ \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
467 ErrorAcc = 0; /* initialize the line error accumulator to 0 */ \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
468 \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
469 /* Is this an X-major or Y-major line? */ \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
470 if (DeltaY > DeltaX) { \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
471 /* Y-major line; calculate 16-bit fixed-point fractional part of a \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
472 pixel that X advances each time Y advances 1 pixel, truncating the \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
473 result so that we won't overrun the endpoint along the X axis */ \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
474 ErrorAdj = ((unsigned long) DeltaX << 16) / (unsigned long) DeltaY; \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
475 /* Draw all pixels other than the first and last */ \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
476 while (--DeltaY) { \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
477 ErrorAccTemp = ErrorAcc; /* remember currrent accumulated error */ \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
478 ErrorAcc += ErrorAdj; /* calculate error for next pixel */ \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
479 if (ErrorAcc <= ErrorAccTemp) { \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
480 /* The error accumulator turned over, so advance the X coord */ \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
481 x1 += XDir; \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
482 } \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
483 y1++; /* Y-major, so always advance Y */ \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
484 /* The IntensityBits most significant bits of ErrorAcc give us the \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
485 intensity weighting for this pixel, and the complement of the \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
486 weighting for the paired pixel */ \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
487 Weighting = ErrorAcc >> 8; \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
488 { \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
489 a = DRAW_MUL(_a, (Weighting ^ 255)); \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
490 r = DRAW_MUL(_r, a); \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
491 g = DRAW_MUL(_g, a); \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
492 b = DRAW_MUL(_b, a); \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
493 inva = (a ^ 0xFF); \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
494 blend_op(x1, y1); \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
495 } \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
496 { \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
497 a = DRAW_MUL(_a, Weighting); \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
498 r = DRAW_MUL(_r, a); \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
499 g = DRAW_MUL(_g, a); \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
500 b = DRAW_MUL(_b, a); \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
501 inva = (a ^ 0xFF); \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
502 blend_op(x1 + XDir, y1); \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
503 } \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
504 } \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
505 } else { \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
506 /* X-major line; calculate 16-bit fixed-point fractional part of a \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
507 pixel that Y advances each time X advances 1 pixel, truncating the \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
508 result to avoid overrunning the endpoint along the X axis */ \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
509 ErrorAdj = ((unsigned long) DeltaY << 16) / (unsigned long) DeltaX; \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
510 /* Draw all pixels other than the first and last */ \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
511 while (--DeltaX) { \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
512 ErrorAccTemp = ErrorAcc; /* remember currrent accumulated error */ \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
513 ErrorAcc += ErrorAdj; /* calculate error for next pixel */ \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
514 if (ErrorAcc <= ErrorAccTemp) { \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
515 /* The error accumulator turned over, so advance the Y coord */ \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
516 y1++; \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
517 } \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
518 x1 += XDir; /* X-major, so always advance X */ \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
519 /* The IntensityBits most significant bits of ErrorAcc give us the \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
520 intensity weighting for this pixel, and the complement of the \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
521 weighting for the paired pixel */ \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
522 Weighting = ErrorAcc >> 8; \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
523 { \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
524 a = DRAW_MUL(_a, (Weighting ^ 255)); \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
525 r = DRAW_MUL(_r, a); \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
526 g = DRAW_MUL(_g, a); \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
527 b = DRAW_MUL(_b, a); \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
528 inva = (a ^ 0xFF); \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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529 blend_op(x1, y1); \
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530 } \
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531 { \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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532 a = DRAW_MUL(_a, Weighting); \
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533 r = DRAW_MUL(_r, a); \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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534 g = DRAW_MUL(_g, a); \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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535 b = DRAW_MUL(_b, a); \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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536 inva = (a ^ 0xFF); \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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537 blend_op(x1, y1 + 1); \
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parents: 3594
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538 } \
3593
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539 } \
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parents: 3536
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540 } \
3596
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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parents: 3594
diff changeset
541 }
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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parents: 3594
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542
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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543 #ifdef AA_LINES
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544 #define AALINE(x1, y1, x2, y2, opaque_op, blend_op, draw_end) \
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545 WULINE(x1, y1, x2, y2, opaque_op, blend_op, draw_end)
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546 #else
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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diff changeset
547 #define AALINE(x1, y1, x2, y2, opaque_op, blend_op, draw_end) \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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diff changeset
548 BLINE(x1, y1, x2, y2, opaque_op, draw_end)
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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diff changeset
549 #endif
3593
b931bcfd94a0 In the process of adding rectangle drawing
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550
b931bcfd94a0 In the process of adding rectangle drawing
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parents: 3536
diff changeset
551 /*
b931bcfd94a0 In the process of adding rectangle drawing
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552 * Define fill rect macro
2898
e40448bc7727 Share code between fill and line drawing
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553 */
e40448bc7727 Share code between fill and line drawing
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parents:
diff changeset
554
2900
3a9636c83849 Make it possible to switch algorithms in the future
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parents: 2899
diff changeset
555 #define FILLRECT(type, op) \
2898
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parents:
diff changeset
556 do { \
3536
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
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parents: 3063
diff changeset
557 int width = rect->w; \
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
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diff changeset
558 int height = rect->h; \
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parents:
diff changeset
559 int pitch = (dst->pitch / dst->format->BytesPerPixel); \
e40448bc7727 Share code between fill and line drawing
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parents:
diff changeset
560 int skip = pitch - width; \
3536
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 3063
diff changeset
561 type *pixel = (type *)dst->pixels + rect->y * pitch + rect->x; \
2898
e40448bc7727 Share code between fill and line drawing
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parents:
diff changeset
562 while (height--) { \
e40448bc7727 Share code between fill and line drawing
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parents:
diff changeset
563 { int n = (width+3)/4; \
e40448bc7727 Share code between fill and line drawing
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parents:
diff changeset
564 switch (width & 3) { \
e40448bc7727 Share code between fill and line drawing
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parents:
diff changeset
565 case 0: do { op; pixel++; \
e40448bc7727 Share code between fill and line drawing
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parents:
diff changeset
566 case 3: op; pixel++; \
e40448bc7727 Share code between fill and line drawing
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diff changeset
567 case 2: op; pixel++; \
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
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diff changeset
568 case 1: op; pixel++; \
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
569 } while ( --n > 0 ); \
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
570 } \
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
571 } \
e40448bc7727 Share code between fill and line drawing
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parents:
diff changeset
572 pixel += skip; \
e40448bc7727 Share code between fill and line drawing
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parents:
diff changeset
573 } \
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
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diff changeset
574 } while (0)
e40448bc7727 Share code between fill and line drawing
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parents:
diff changeset
575
e40448bc7727 Share code between fill and line drawing
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parents:
diff changeset
576 /* vi: set ts=4 sw=4 expandtab: */