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annotate src/render/software/SDL_draw.h @ 5275:7aba0406c273

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Frank Zago to sdl The following patch fixes some of the bitrot for the Nintendo DS port. The support is still basic at the moment, but it allows to run the "general" test under the current head of tree (parent: 5269:11bd1585efb5 tip). Most of the patch is mine, but I integrated a couple changes that John Magnotti posted on Feb 1st.
author Sam Lantinga <slouken@libsdl.org>
date Sat, 12 Feb 2011 11:36:56 -0800
parents b530ef003506
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) 1997-2011 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 "../../video/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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diff changeset
271 PIXEL_FROM_RGBA(*pixel, fmt, sr, sg, sb, sa))
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272
5187
d976b67150c5 Restored SDL_BLENDMODE_MOD for MAME
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273 #define DRAW_SETPIXEL_MOD_RGBA \
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diff changeset
274 DRAW_SETPIXEL_MOD(RGBA_FROM_PIXEL(*pixel, fmt, sr, sg, sb, sa), \
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diff changeset
275 PIXEL_FROM_RGBA(*pixel, fmt, sr, sg, sb, sa))
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276
2898
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diff changeset
277 #define DRAW_SETPIXELXY4_RGBA(x, y) \
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diff changeset
278 DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_RGBA)
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279
e40448bc7727 Share code between fill and line drawing
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diff changeset
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
e40448bc7727 Share code between fill and line drawing
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diff changeset
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
5187
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diff changeset
286 #define DRAW_SETPIXELXY4_MOD_RGBA(x, y) \
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diff changeset
287 DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_MOD_RGBA)
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288
2898
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289 /*
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parents:
diff changeset
290 * Define line drawing macro
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diff changeset
291 */
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292
e40448bc7727 Share code between fill and line drawing
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diff changeset
293 #define ABS(_x) ((_x) < 0 ? -(_x) : (_x))
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294
3596
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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diff changeset
295 /* Horizontal line */
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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diff changeset
296 #define HLINE(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
297 { \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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diff changeset
298 int length; \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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parents: 3594
diff changeset
299 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
300 type *pixel; \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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parents: 3594
diff changeset
301 if (x1 <= x2) { \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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parents: 3594
diff changeset
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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parents: 3594
diff changeset
303 length = draw_end ? (x2-x1+1) : (x2-x1); \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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parents: 3594
diff changeset
304 } else { \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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parents: 3594
diff changeset
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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parents: 3594
diff changeset
306 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
307 ++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
308 } \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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parents: 3594
diff changeset
309 length = draw_end ? (x1-x2+1) : (x1-x2); \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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diff changeset
310 } \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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parents: 3594
diff changeset
311 while (length--) { \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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parents: 3594
diff changeset
312 op; \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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parents: 3594
diff changeset
313 ++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
314 } \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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parents: 3594
diff changeset
315 }
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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parents: 3594
diff changeset
316
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
317 /* Vertical 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
318 #define VLINE(type, op, 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
319 { \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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parents: 3594
diff changeset
320 int length; \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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parents: 3594
diff changeset
321 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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parents: 3594
diff changeset
322 type *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
323 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
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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parents: 3594
diff changeset
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.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
326 } 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
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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parents: 3594
diff changeset
328 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
329 pixel += pitch; \
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
330 } \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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parents: 3594
diff changeset
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.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
332 } \
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
333 while (length--) { \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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parents: 3594
diff changeset
334 op; \
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
335 pixel += pitch; \
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
336 } \
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
337 }
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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parents: 3594
diff changeset
338
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
339 /* Diagonal 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
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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parents: 3594
diff changeset
341 { \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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parents: 3594
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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parents: 3594
diff changeset
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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parents: 3594
diff changeset
344 type *pixel; \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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parents: 3594
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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parents: 3594
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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parents: 3594
diff changeset
347 if (x1 <= x2) { \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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parents: 3594
diff changeset
348 ++pitch; \
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
349 } else { \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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parents: 3594
diff changeset
350 --pitch; \
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
351 } \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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parents: 3594
diff changeset
352 length = (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
353 } else { \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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parents: 3594
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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parents: 3594
diff changeset
355 if (x2 <= x1) { \
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
356 ++pitch; \
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
357 } 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
358 --pitch; \
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
359 } \
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
360 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
361 pixel += pitch; \
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
362 } \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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parents: 3594
diff changeset
363 length = (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
364 } \
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
365 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
366 ++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
367 } \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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parents: 3594
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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parents: 3594
diff changeset
369 op; \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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parents: 3594
diff changeset
370 pixel += pitch; \
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
371 } \
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
372 }
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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parents: 3594
diff changeset
373
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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parents: 3594
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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parents: 3594
diff changeset
375 #define BLINE(x1, y1, x2, y2, op, draw_end) \
2898
e40448bc7727 Share code between fill and line drawing
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parents:
diff changeset
376 { \
2903
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
Sam Lantinga <slouken@libsdl.org>
parents: 2901
diff changeset
377 int i, deltax, deltay, numpixels; \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
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parents: 2901
diff changeset
378 int d, dinc1, dinc2; \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
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parents: 2901
diff changeset
379 int x, xinc1, xinc2; \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
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parents: 2901
diff changeset
380 int y, yinc1, yinc2; \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
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parents: 2901
diff changeset
381 \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
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parents: 2901
diff changeset
382 deltax = ABS(x2 - x1); \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
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parents: 2901
diff changeset
383 deltay = ABS(y2 - y1); \
2898
e40448bc7727 Share code between fill and line drawing
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parents:
diff changeset
384 \
2903
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
Sam Lantinga <slouken@libsdl.org>
parents: 2901
diff changeset
385 if (deltax >= deltay) { \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
Sam Lantinga <slouken@libsdl.org>
parents: 2901
diff changeset
386 numpixels = deltax + 1; \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
Sam Lantinga <slouken@libsdl.org>
parents: 2901
diff changeset
387 d = (2 * deltay) - deltax; \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
Sam Lantinga <slouken@libsdl.org>
parents: 2901
diff changeset
388 dinc1 = deltay * 2; \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
Sam Lantinga <slouken@libsdl.org>
parents: 2901
diff changeset
389 dinc2 = (deltay - deltax) * 2; \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
Sam Lantinga <slouken@libsdl.org>
parents: 2901
diff changeset
390 xinc1 = 1; \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
Sam Lantinga <slouken@libsdl.org>
parents: 2901
diff changeset
391 xinc2 = 1; \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
Sam Lantinga <slouken@libsdl.org>
parents: 2901
diff changeset
392 yinc1 = 0; \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
Sam Lantinga <slouken@libsdl.org>
parents: 2901
diff changeset
393 yinc2 = 1; \
2898
e40448bc7727 Share code between fill and line drawing
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parents:
diff changeset
394 } else { \
2903
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
Sam Lantinga <slouken@libsdl.org>
parents: 2901
diff changeset
395 numpixels = deltay + 1; \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
Sam Lantinga <slouken@libsdl.org>
parents: 2901
diff changeset
396 d = (2 * deltax) - deltay; \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
Sam Lantinga <slouken@libsdl.org>
parents: 2901
diff changeset
397 dinc1 = deltax * 2; \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
Sam Lantinga <slouken@libsdl.org>
parents: 2901
diff changeset
398 dinc2 = (deltax - deltay) * 2; \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
Sam Lantinga <slouken@libsdl.org>
parents: 2901
diff changeset
399 xinc1 = 0; \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
Sam Lantinga <slouken@libsdl.org>
parents: 2901
diff changeset
400 xinc2 = 1; \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
Sam Lantinga <slouken@libsdl.org>
parents: 2901
diff changeset
401 yinc1 = 1; \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
Sam Lantinga <slouken@libsdl.org>
parents: 2901
diff changeset
402 yinc2 = 1; \
2898
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
403 } \
2903
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
Sam Lantinga <slouken@libsdl.org>
parents: 2901
diff changeset
404 \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
Sam Lantinga <slouken@libsdl.org>
parents: 2901
diff changeset
405 if (x1 > x2) { \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
Sam Lantinga <slouken@libsdl.org>
parents: 2901
diff changeset
406 xinc1 = -xinc1; \
e426c4fc9cf7 Working Bresenham line drawing algorithm. We can optimize later, if needed.
Sam Lantinga <slouken@libsdl.org>
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.
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521 weighting for the paired pixel */ \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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diff changeset
522 Weighting = ErrorAcc >> 8; \
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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523 { \
f638ded38b8a Added SDL_RenderClear() as a fast method of clearing the screen to the drawing color.
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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.
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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>
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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.
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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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parents: 3594
diff changeset
529 blend_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
530 } \
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
531 { \
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
532 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
533 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
534 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
535 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
536 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
537 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
538 } \
3593
b931bcfd94a0 In the process of adding rectangle drawing
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
539 } \
b931bcfd94a0 In the process of adding rectangle drawing
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
540 } \
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
541 }
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
542
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
543 #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
544 #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
545 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
546 #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
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.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
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.
Sam Lantinga <slouken@libsdl.org>
parents: 3594
diff changeset
549 #endif
3593
b931bcfd94a0 In the process of adding rectangle drawing
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
550
b931bcfd94a0 In the process of adding rectangle drawing
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
551 /*
b931bcfd94a0 In the process of adding rectangle drawing
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
552 * Define fill rect macro
2898
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
553 */
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
554
2900
3a9636c83849 Make it possible to switch algorithms in the future
Sam Lantinga <slouken@libsdl.org>
parents: 2899
diff changeset
555 #define FILLRECT(type, op) \
2898
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
556 do { \
3536
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 3063
diff changeset
557 int width = rect->w; \
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 3063
diff changeset
558 int height = rect->h; \
2898
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
559 int pitch = (dst->pitch / dst->format->BytesPerPixel); \
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
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
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
562 while (height--) { \
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
563 { int n = (width+3)/4; \
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
564 switch (width & 3) { \
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
565 case 0: do { op; pixel++; \
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
566 case 3: op; pixel++; \
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
567 case 2: op; pixel++; \
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
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
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
572 pixel += skip; \
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
573 } \
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
574 } while (0)
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
575
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
576 /* vi: set ts=4 sw=4 expandtab: */