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annotate src/video/SDL_draw.h @ 5151:5429daf5e3f9

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The DrawRect API is implemented using lines
author Sam Lantinga <slouken@libsdl.org>
date Tue, 01 Feb 2011 20:50:04 -0800
parents e743b9c3f6d6
children
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_SETPIXELXY(x, y, type, bpp, op) \
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74 do { \
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75 type *pixel = (type *)((Uint8 *)dst->pixels + (y) * dst->pitch \
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76 + (x) * bpp); \
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77 op; \
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78 } while (0)
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79
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80 /*
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81 * Define draw operators for RGB555
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82 */
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83
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84 #define DRAW_SETPIXEL_RGB555 \
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85 DRAW_SETPIXEL(RGB555_FROM_RGB(*pixel, sr, sg, sb))
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86
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87 #define DRAW_SETPIXEL_BLEND_RGB555 \
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88 DRAW_SETPIXEL_BLEND(RGB_FROM_RGB555(*pixel, sr, sg, sb), \
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89 RGB555_FROM_RGB(*pixel, sr, sg, sb))
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90
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91 #define DRAW_SETPIXEL_ADD_RGB555 \
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92 DRAW_SETPIXEL_ADD(RGB_FROM_RGB555(*pixel, sr, sg, sb), \
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93 RGB555_FROM_RGB(*pixel, sr, sg, sb))
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94
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95 #define DRAW_SETPIXELXY_RGB555(x, y) \
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96 DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_RGB555)
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97
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98 #define DRAW_SETPIXELXY_BLEND_RGB555(x, y) \
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99 DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_BLEND_RGB555)
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100
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101 #define DRAW_SETPIXELXY_ADD_RGB555(x, y) \
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102 DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_ADD_RGB555)
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103
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104 /*
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105 * Define draw operators for RGB565
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106 */
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107
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108 #define DRAW_SETPIXEL_RGB565 \
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109 DRAW_SETPIXEL(RGB565_FROM_RGB(*pixel, sr, sg, sb))
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110
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111 #define DRAW_SETPIXEL_BLEND_RGB565 \
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112 DRAW_SETPIXEL_BLEND(RGB_FROM_RGB565(*pixel, sr, sg, sb), \
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113 RGB565_FROM_RGB(*pixel, sr, sg, sb))
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114
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115 #define DRAW_SETPIXEL_ADD_RGB565 \
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116 DRAW_SETPIXEL_ADD(RGB_FROM_RGB565(*pixel, sr, sg, sb), \
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117 RGB565_FROM_RGB(*pixel, sr, sg, sb))
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118
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119 #define DRAW_SETPIXELXY_RGB565(x, y) \
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120 DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_RGB565)
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121
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122 #define DRAW_SETPIXELXY_BLEND_RGB565(x, y) \
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123 DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_BLEND_RGB565)
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124
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125 #define DRAW_SETPIXELXY_ADD_RGB565(x, y) \
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126 DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_ADD_RGB565)
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127
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128 /*
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129 * Define draw operators for RGB888
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130 */
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131
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132 #define DRAW_SETPIXEL_RGB888 \
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133 DRAW_SETPIXEL(RGB888_FROM_RGB(*pixel, sr, sg, sb))
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134
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135 #define DRAW_SETPIXEL_BLEND_RGB888 \
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136 DRAW_SETPIXEL_BLEND(RGB_FROM_RGB888(*pixel, sr, sg, sb), \
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137 RGB888_FROM_RGB(*pixel, sr, sg, sb))
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138
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139 #define DRAW_SETPIXEL_ADD_RGB888 \
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140 DRAW_SETPIXEL_ADD(RGB_FROM_RGB888(*pixel, sr, sg, sb), \
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141 RGB888_FROM_RGB(*pixel, sr, sg, sb))
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142
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143 #define DRAW_SETPIXELXY_RGB888(x, y) \
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144 DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_RGB888)
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145
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146 #define DRAW_SETPIXELXY_BLEND_RGB888(x, y) \
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147 DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_BLEND_RGB888)
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148
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149 #define DRAW_SETPIXELXY_ADD_RGB888(x, y) \
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150 DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_ADD_RGB888)
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151
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152 /*
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153 * Define draw operators for ARGB8888
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154 */
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155
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156 #define DRAW_SETPIXEL_ARGB8888 \
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157 DRAW_SETPIXEL(ARGB8888_FROM_RGBA(*pixel, sr, sg, sb, sa))
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158
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159 #define DRAW_SETPIXEL_BLEND_ARGB8888 \
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160 DRAW_SETPIXEL_BLEND(RGBA_FROM_ARGB8888(*pixel, sr, sg, sb, sa), \
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161 ARGB8888_FROM_RGBA(*pixel, sr, sg, sb, sa))
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162
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163 #define DRAW_SETPIXEL_ADD_ARGB8888 \
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164 DRAW_SETPIXEL_ADD(RGBA_FROM_ARGB8888(*pixel, sr, sg, sb, sa), \
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165 ARGB8888_FROM_RGBA(*pixel, sr, sg, sb, sa))
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166
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167 #define DRAW_SETPIXELXY_ARGB8888(x, y) \
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168 DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_ARGB8888)
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169
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170 #define DRAW_SETPIXELXY_BLEND_ARGB8888(x, y) \
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171 DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_BLEND_ARGB8888)
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172
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173 #define DRAW_SETPIXELXY_ADD_ARGB8888(x, y) \
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174 DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_ADD_ARGB8888)
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175
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176 /*
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177 * Define draw operators for general RGB
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178 */
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179
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180 #define DRAW_SETPIXEL_RGB \
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181 DRAW_SETPIXEL(PIXEL_FROM_RGB(*pixel, fmt, sr, sg, sb))
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182
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183 #define DRAW_SETPIXEL_BLEND_RGB \
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184 DRAW_SETPIXEL_BLEND(RGB_FROM_PIXEL(*pixel, fmt, sr, sg, sb), \
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185 PIXEL_FROM_RGB(*pixel, fmt, sr, sg, sb))
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186
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187 #define DRAW_SETPIXEL_ADD_RGB \
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188 DRAW_SETPIXEL_ADD(RGB_FROM_PIXEL(*pixel, fmt, sr, sg, sb), \
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189 PIXEL_FROM_RGB(*pixel, fmt, sr, sg, sb))
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190
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191 #define DRAW_SETPIXELXY2_RGB(x, y) \
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192 DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_RGB)
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193
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194 #define DRAW_SETPIXELXY4_RGB(x, y) \
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195 DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_RGB)
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196
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197 #define DRAW_SETPIXELXY2_BLEND_RGB(x, y) \
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198 DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_BLEND_RGB)
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199
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200 #define DRAW_SETPIXELXY4_BLEND_RGB(x, y) \
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201 DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_BLEND_RGB)
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202
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203 #define DRAW_SETPIXELXY2_ADD_RGB(x, y) \
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204 DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_ADD_RGB)
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205
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206 #define DRAW_SETPIXELXY4_ADD_RGB(x, y) \
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207 DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_ADD_RGB)
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208
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209
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210 /*
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211 * Define draw operators for general RGBA
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212 */
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213
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214 #define DRAW_SETPIXEL_RGBA \
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215 DRAW_SETPIXEL(PIXEL_FROM_RGBA(*pixel, fmt, sr, sg, sb, sa))
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216
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217 #define DRAW_SETPIXEL_BLEND_RGBA \
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218 DRAW_SETPIXEL_BLEND(RGBA_FROM_PIXEL(*pixel, fmt, sr, sg, sb, sa), \
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219 PIXEL_FROM_RGBA(*pixel, fmt, sr, sg, sb, sa))
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220
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221 #define DRAW_SETPIXEL_ADD_RGBA \
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222 DRAW_SETPIXEL_ADD(RGBA_FROM_PIXEL(*pixel, fmt, sr, sg, sb, sa), \
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223 PIXEL_FROM_RGBA(*pixel, fmt, sr, sg, sb, sa))
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224
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225 #define DRAW_SETPIXELXY4_RGBA(x, y) \
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226 DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_RGBA)
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227
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228 #define DRAW_SETPIXELXY4_BLEND_RGBA(x, y) \
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229 DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_BLEND_RGBA)
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230
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231 #define DRAW_SETPIXELXY4_ADD_RGBA(x, y) \
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232 DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_ADD_RGBA)
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233
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234 /*
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235 * Define line drawing macro
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236 */
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237
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238 #define ABS(_x) ((_x) < 0 ? -(_x) : (_x))
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239
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240 /* Horizontal line */
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241 #define HLINE(type, op, draw_end) \
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242 { \
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243 int length; \
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244 int pitch = (dst->pitch / dst->format->BytesPerPixel); \
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245 type *pixel; \
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246 if (x1 <= x2) { \
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247 pixel = (type *)dst->pixels + y1 * pitch + x1; \
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248 length = draw_end ? (x2-x1+1) : (x2-x1); \
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249 } else { \
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250 pixel = (type *)dst->pixels + y1 * pitch + x2; \
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251 if (!draw_end) { \
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252 ++pixel; \
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253 } \
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254 length = draw_end ? (x1-x2+1) : (x1-x2); \
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255 } \
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256 while (length--) { \
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257 op; \
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258 ++pixel; \
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259 } \
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260 }
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261
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262 /* Vertical line */
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263 #define VLINE(type, op, draw_end) \
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264 { \
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265 int length; \
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266 int pitch = (dst->pitch / dst->format->BytesPerPixel); \
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267 type *pixel; \
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268 if (y1 <= y2) { \
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269 pixel = (type *)dst->pixels + y1 * pitch + x1; \
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270 length = draw_end ? (y2-y1+1) : (y2-y1); \
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271 } else { \
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272 pixel = (type *)dst->pixels + y2 * pitch + x1; \
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273 if (!draw_end) { \
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274 pixel += pitch; \
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275 } \
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276 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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277 } \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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diff changeset
278 while (length--) { \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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diff changeset
279 op; \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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diff changeset
280 pixel += pitch; \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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diff changeset
281 } \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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282 }
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283
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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diff changeset
284 /* Diagonal line */
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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diff changeset
285 #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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diff changeset
286 { \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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diff changeset
287 int length; \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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diff changeset
288 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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diff changeset
289 type *pixel; \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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diff changeset
290 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
291 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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diff changeset
292 if (x1 <= x2) { \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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diff changeset
293 ++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
294 } else { \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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diff changeset
295 --pitch; \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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diff changeset
296 } \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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diff changeset
297 length = (y2-y1); \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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diff changeset
298 } else { \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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diff changeset
299 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
300 if (x2 <= x1) { \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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diff changeset
301 ++pitch; \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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diff changeset
302 } else { \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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diff changeset
303 --pitch; \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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diff changeset
304 } \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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diff changeset
305 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
306 pixel += pitch; \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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diff changeset
307 } \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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diff changeset
308 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
309 } \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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diff changeset
310 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
311 ++length; \
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
312 } \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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diff changeset
313 while (length--) { \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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diff changeset
314 op; \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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diff changeset
315 pixel += pitch; \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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diff changeset
316 } \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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diff changeset
317 }
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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diff changeset
318
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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diff changeset
319 /* 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
320 #define BLINE(x1, y1, x2, y2, op, draw_end) \
2898
e40448bc7727 Share code between fill and line drawing
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diff changeset
321 { \
2903
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
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diff changeset
322 int i, deltax, deltay, numpixels; \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
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diff changeset
323 int d, dinc1, dinc2; \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
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diff changeset
324 int x, xinc1, xinc2; \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
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diff changeset
325 int y, yinc1, yinc2; \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
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diff changeset
326 \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
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diff changeset
327 deltax = ABS(x2 - x1); \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
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diff changeset
328 deltay = ABS(y2 - y1); \
2898
e40448bc7727 Share code between fill and line drawing
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diff changeset
329 \
2903
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
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diff changeset
330 if (deltax >= deltay) { \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
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parents: 2901
diff changeset
331 numpixels = deltax + 1; \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
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parents: 2901
diff changeset
332 d = (2 * deltay) - deltax; \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
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parents: 2901
diff changeset
333 dinc1 = deltay * 2; \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
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diff changeset
334 dinc2 = (deltay - deltax) * 2; \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
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diff changeset
335 xinc1 = 1; \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
336 xinc2 = 1; \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
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diff changeset
337 yinc1 = 0; \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
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diff changeset
338 yinc2 = 1; \
2898
e40448bc7727 Share code between fill and line drawing
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parents:
diff changeset
339 } else { \
2903
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
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diff changeset
340 numpixels = deltay + 1; \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
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diff changeset
341 d = (2 * deltax) - deltay; \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
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diff changeset
342 dinc1 = deltax * 2; \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
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parents: 2901
diff changeset
343 dinc2 = (deltax - deltay) * 2; \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
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diff changeset
344 xinc1 = 0; \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
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diff changeset
345 xinc2 = 1; \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
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diff changeset
346 yinc1 = 1; \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
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diff changeset
347 yinc2 = 1; \
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e40448bc7727 Share code between fill and line drawing
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diff changeset
348 } \
2903
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
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diff changeset
349 \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
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diff changeset
350 if (x1 > x2) { \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
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diff changeset
351 xinc1 = -xinc1; \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
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diff changeset
352 xinc2 = -xinc2; \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
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diff changeset
353 } \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
Sam Lantinga <slouken@libsdl.org>
parents: 2901
diff changeset
354 if (y1 > y2) { \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
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parents: 2901
diff changeset
355 yinc1 = -yinc1; \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
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parents: 2901
diff changeset
356 yinc2 = -yinc2; \
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e40448bc7727 Share code between fill and line drawing
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diff changeset
357 } \
2903
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
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diff changeset
358 \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
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diff changeset
359 x = x1; \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
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parents: 2901
diff changeset
360 y = y1; \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
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diff changeset
361 \
3594
c8bed77b0386 Added SDL_DrawRect(), SDL_DrawRects(), SDL_BlendRect() and SDL_BlendRects()
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parents: 3593
diff changeset
362 if (!draw_end) { \
c8bed77b0386 Added SDL_DrawRect(), SDL_DrawRects(), SDL_BlendRect() and SDL_BlendRects()
Sam Lantinga <slouken@libsdl.org>
parents: 3593
diff changeset
363 --numpixels; \
c8bed77b0386 Added SDL_DrawRect(), SDL_DrawRects(), SDL_BlendRect() and SDL_BlendRects()
Sam Lantinga <slouken@libsdl.org>
parents: 3593
diff changeset
364 } \
3063
9f2482d6662c Fixed off by one error in line drawing code
Sam Lantinga <slouken@libsdl.org>
parents: 2918
diff changeset
365 for (i = 0; i < numpixels; ++i) { \
2903
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
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parents: 2901
diff changeset
366 op(x, y); \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
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parents: 2901
diff changeset
367 if (d < 0) { \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
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parents: 2901
diff changeset
368 d += dinc1; \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
Sam Lantinga <slouken@libsdl.org>
parents: 2901
diff changeset
369 x += xinc1; \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
370 y += yinc1; \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
Sam Lantinga <slouken@libsdl.org>
parents: 2901
diff changeset
371 } else { \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
Sam Lantinga <slouken@libsdl.org>
parents: 2901
diff changeset
372 d += dinc2; \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
Sam Lantinga <slouken@libsdl.org>
parents: 2901
diff changeset
373 x += xinc2; \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
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diff changeset
374 y += yinc2; \
2898
e40448bc7727 Share code between fill and line drawing
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diff changeset
375 } \
e40448bc7727 Share code between fill and line drawing
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parents:
diff changeset
376 } \
e40448bc7727 Share code between fill and line drawing
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parents:
diff changeset
377 }
e40448bc7727 Share code between fill and line drawing
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parents:
diff changeset
378
3596
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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diff changeset
379 /* 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
380 #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.
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diff changeset
381 { \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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diff changeset
382 Uint16 ErrorAdj, ErrorAcc; \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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parents: 3594
diff changeset
383 Uint16 ErrorAccTemp, Weighting; \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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parents: 3594
diff changeset
384 int DeltaX, DeltaY, Temp, XDir; \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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parents: 3594
diff changeset
385 unsigned r, g, b, a, inva; \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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parents: 3594
diff changeset
386 \
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
387 /* 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
388 the line and so needs no weighting */ \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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parents: 3594
diff changeset
389 opaque_op(x1, y1); \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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parents: 3594
diff changeset
390 \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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parents: 3594
diff changeset
391 /* 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.
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parents: 3594
diff changeset
392 and so needs no weighting */ \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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parents: 3594
diff changeset
393 if (draw_end) { \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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parents: 3594
diff changeset
394 opaque_op(x2, y2); \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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parents: 3594
diff changeset
395 } \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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parents: 3594
diff changeset
396 \
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
397 /* 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
398 if (y1 > y2) { \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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parents: 3594
diff changeset
399 Temp = y1; y1 = y2; y2 = Temp; \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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parents: 3594
diff changeset
400 Temp = x1; x1 = x2; x2 = Temp; \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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parents: 3594
diff changeset
401 } \
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
402 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
403 \
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
404 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
405 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
406 } 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
407 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
408 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
409 } \
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
410 \
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
411 /* 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
412 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
413 \
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
414 /* 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
415 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
416 /* 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
417 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
418 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
419 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
420 /* 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
421 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
422 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
423 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
424 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
425 /* 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
426 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
427 } \
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
428 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
429 /* 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
430 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
431 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
432 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
433 { \
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 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
435 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
436 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
437 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
438 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
439 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
440 } \
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 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
443 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
444 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
445 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
446 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
447 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
448 } \
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 } \
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 } 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
451 /* 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
452 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
453 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
454 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
455 /* 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
456 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
457 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
458 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
459 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
460 /* 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
461 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
462 } \
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 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
464 /* 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
465 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
466 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
467 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
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 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
470 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
471 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
472 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
473 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
474 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
475 } \
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 { \
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 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
478 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
479 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
480 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
481 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
482 blend_op(x1, y1 + 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
483 } \
3593
b931bcfd94a0 In the process of adding rectangle drawing
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
484 } \
b931bcfd94a0 In the process of adding rectangle drawing
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
485 } \
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
486 }
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
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 #ifdef AA_LINES
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 #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.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
490 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
491 #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
492 #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.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
493 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.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
494 #endif
3593
b931bcfd94a0 In the process of adding rectangle drawing
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
495
b931bcfd94a0 In the process of adding rectangle drawing
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
496 /*
b931bcfd94a0 In the process of adding rectangle drawing
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
497 * Define fill rect macro
2898
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
498 */
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
499
2900
3a9636c83849 Make it possible to switch algorithms in the future
Sam Lantinga <slouken@libsdl.org>
parents: 2899
diff changeset
500 #define FILLRECT(type, op) \
2898
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
501 do { \
3536
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 3063
diff changeset
502 int width = rect->w; \
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 3063
diff changeset
503 int height = rect->h; \
2898
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
504 int pitch = (dst->pitch / dst->format->BytesPerPixel); \
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
505 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
506 type *pixel = (type *)dst->pixels + rect->y * pitch + rect->x; \
2898
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
507 while (height--) { \
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
508 { int n = (width+3)/4; \
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
509 switch (width & 3) { \
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
510 case 0: do { op; pixel++; \
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
511 case 3: op; pixel++; \
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
512 case 2: op; pixel++; \
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
513 case 1: op; pixel++; \
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
514 } while ( --n > 0 ); \
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
515 } \
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
516 } \
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
517 pixel += skip; \
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
518 } \
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
519 } while (0)
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
520
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
521 /* vi: set ts=4 sw=4 expandtab: */