Mercurial > sdl-ios-xcode
annotate src/video/SDL_draw.h @ 3443:7f477a22dff5
Trying to figure out why the OpenGL tests are failing...
author | Sam Lantinga <slouken@libsdl.org> |
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date | Wed, 18 Nov 2009 06:15:44 +0000 |
parents | 9f2482d6662c |
children | 0267b8b1595c |
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1 /* |
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2 SDL - Simple DirectMedia Layer |
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3 Copyright (C) 1997-2009 Sam Lantinga |
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4 |
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5 This library is free software; you can redistribute it and/or |
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6 modify it under the terms of the GNU Lesser General Public |
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7 License as published by the Free Software Foundation; either |
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8 version 2.1 of the License, or (at your option) any later version. |
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9 |
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10 This library is distributed in the hope that it will be useful, |
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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13 Lesser General Public License for more details. |
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14 |
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15 You should have received a copy of the GNU Lesser General Public |
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16 License along with this library; if not, write to the Free Software |
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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18 |
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19 Sam Lantinga |
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20 slouken@libsdl.org |
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21 */ |
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22 #include "SDL_config.h" |
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23 |
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24 #include "SDL_blit.h" |
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25 |
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26 /* This code assumes that r, g, b, a are the source color, |
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27 * and in the blend and add case, the RGB values are premultiplied by a. |
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28 */ |
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29 |
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30 #define DRAW_MUL(_a, _b) (((unsigned)(_a)*(_b))/255) |
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31 |
2901 | 32 #define DRAW_FASTSETPIXEL(x, y, type, bpp, color) \ |
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33 *(type *)((Uint8 *)dst->pixels + y * dst->pitch + x * bpp) = (type) color |
2901 | 34 |
35 #define DRAW_FASTSETPIXEL1(x, y) DRAW_FASTSETPIXEL(x, y, Uint8, 1, color); | |
36 #define DRAW_FASTSETPIXEL2(x, y) DRAW_FASTSETPIXEL(x, y, Uint16, 2, color); | |
37 #define DRAW_FASTSETPIXEL4(x, y) DRAW_FASTSETPIXEL(x, y, Uint32, 4, color); | |
38 | |
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39 #define DRAW_SETPIXEL(setpixel) \ |
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40 do { \ |
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41 unsigned sr = r, sg = g, sb = b, sa = a; \ |
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42 setpixel; \ |
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43 } while (0) |
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44 |
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45 #define DRAW_SETPIXEL_BLEND(getpixel, setpixel) \ |
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46 do { \ |
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47 unsigned sr, sg, sb, sa; sa; \ |
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48 getpixel; \ |
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49 sr = DRAW_MUL(inva, sr) + r; \ |
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50 sg = DRAW_MUL(inva, sg) + g; \ |
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51 sb = DRAW_MUL(inva, sb) + b; \ |
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52 setpixel; \ |
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53 } while (0) |
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54 |
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55 #define DRAW_SETPIXEL_ADD(getpixel, setpixel) \ |
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56 do { \ |
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57 unsigned sr, sg, sb, sa; sa; \ |
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58 getpixel; \ |
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59 sr += r; if (sr > 0xff) sr = 0xff; \ |
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60 sg += g; if (sg > 0xff) sg = 0xff; \ |
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61 sb += b; if (sb > 0xff) sb = 0xff; \ |
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62 setpixel; \ |
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63 } while (0) |
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64 |
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65 #define DRAW_SETPIXEL_MOD(getpixel, setpixel) \ |
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66 do { \ |
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67 unsigned sr, sg, sb, sa; sa; \ |
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68 getpixel; \ |
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69 sr = DRAW_MUL(sr, r); \ |
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70 sg = DRAW_MUL(sg, g); \ |
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71 sb = DRAW_MUL(sb, b); \ |
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72 setpixel; \ |
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73 } while (0) |
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74 |
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75 #define DRAW_SETPIXELXY(x, y, type, bpp, op) \ |
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76 do { \ |
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77 type *pixel = (type *)((Uint8 *)dst->pixels + y * dst->pitch + x * bpp); \ |
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78 op; \ |
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79 } while (0) |
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80 |
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81 /* |
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82 * Define draw operators for RGB555 |
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83 */ |
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84 |
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85 #define DRAW_SETPIXEL_RGB555 \ |
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86 DRAW_SETPIXEL(RGB555_FROM_RGB(*pixel, sr, sg, sb)) |
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87 |
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88 #define DRAW_SETPIXEL_BLEND_RGB555 \ |
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89 DRAW_SETPIXEL_BLEND(RGB_FROM_RGB555(*pixel, sr, sg, sb), \ |
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90 RGB555_FROM_RGB(*pixel, sr, sg, sb)) |
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91 |
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92 #define DRAW_SETPIXEL_ADD_RGB555 \ |
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93 DRAW_SETPIXEL_ADD(RGB_FROM_RGB555(*pixel, sr, sg, sb), \ |
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94 RGB555_FROM_RGB(*pixel, sr, sg, sb)) |
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95 |
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96 #define DRAW_SETPIXEL_MOD_RGB555 \ |
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97 DRAW_SETPIXEL_MOD(RGB_FROM_RGB555(*pixel, sr, sg, sb), \ |
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98 RGB555_FROM_RGB(*pixel, sr, sg, sb)) |
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99 |
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100 #define DRAW_SETPIXELXY_RGB555(x, y) \ |
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101 DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_RGB555) |
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102 |
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103 #define DRAW_SETPIXELXY_BLEND_RGB555(x, y) \ |
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104 DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_BLEND_RGB555) |
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105 |
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106 #define DRAW_SETPIXELXY_ADD_RGB555(x, y) \ |
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107 DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_ADD_RGB555) |
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108 |
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109 #define DRAW_SETPIXELXY_MOD_RGB555(x, y) \ |
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110 DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_MOD_RGB555) |
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111 |
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112 /* |
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113 * Define draw operators for RGB565 |
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114 */ |
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115 |
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116 #define DRAW_SETPIXEL_RGB565 \ |
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117 DRAW_SETPIXEL(RGB565_FROM_RGB(*pixel, sr, sg, sb)) |
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118 |
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119 #define DRAW_SETPIXEL_BLEND_RGB565 \ |
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120 DRAW_SETPIXEL_BLEND(RGB_FROM_RGB565(*pixel, sr, sg, sb), \ |
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121 RGB565_FROM_RGB(*pixel, sr, sg, sb)) |
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122 |
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123 #define DRAW_SETPIXEL_ADD_RGB565 \ |
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124 DRAW_SETPIXEL_ADD(RGB_FROM_RGB565(*pixel, sr, sg, sb), \ |
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125 RGB565_FROM_RGB(*pixel, sr, sg, sb)) |
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126 |
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127 #define DRAW_SETPIXEL_MOD_RGB565 \ |
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128 DRAW_SETPIXEL_MOD(RGB_FROM_RGB565(*pixel, sr, sg, sb), \ |
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129 RGB565_FROM_RGB(*pixel, sr, sg, sb)) |
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130 |
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131 #define DRAW_SETPIXELXY_RGB565(x, y) \ |
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132 DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_RGB565) |
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133 |
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134 #define DRAW_SETPIXELXY_BLEND_RGB565(x, y) \ |
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135 DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_BLEND_RGB565) |
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136 |
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137 #define DRAW_SETPIXELXY_ADD_RGB565(x, y) \ |
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138 DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_ADD_RGB565) |
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139 |
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140 #define DRAW_SETPIXELXY_MOD_RGB565(x, y) \ |
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141 DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_MOD_RGB565) |
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142 |
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143 /* |
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144 * Define draw operators for RGB888 |
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145 */ |
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146 |
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147 #define DRAW_SETPIXEL_RGB888 \ |
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148 DRAW_SETPIXEL(RGB888_FROM_RGB(*pixel, sr, sg, sb)) |
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149 |
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150 #define DRAW_SETPIXEL_BLEND_RGB888 \ |
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151 DRAW_SETPIXEL_BLEND(RGB_FROM_RGB888(*pixel, sr, sg, sb), \ |
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152 RGB888_FROM_RGB(*pixel, sr, sg, sb)) |
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153 |
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154 #define DRAW_SETPIXEL_ADD_RGB888 \ |
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155 DRAW_SETPIXEL_ADD(RGB_FROM_RGB888(*pixel, sr, sg, sb), \ |
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156 RGB888_FROM_RGB(*pixel, sr, sg, sb)) |
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157 |
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158 #define DRAW_SETPIXEL_MOD_RGB888 \ |
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159 DRAW_SETPIXEL_MOD(RGB_FROM_RGB888(*pixel, sr, sg, sb), \ |
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160 RGB888_FROM_RGB(*pixel, sr, sg, sb)) |
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161 |
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162 #define DRAW_SETPIXELXY_RGB888(x, y) \ |
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163 DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_RGB888) |
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164 |
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165 #define DRAW_SETPIXELXY_BLEND_RGB888(x, y) \ |
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166 DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_BLEND_RGB888) |
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167 |
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168 #define DRAW_SETPIXELXY_ADD_RGB888(x, y) \ |
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169 DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_ADD_RGB888) |
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170 |
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171 #define DRAW_SETPIXELXY_MOD_RGB888(x, y) \ |
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172 DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_MOD_RGB888) |
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173 |
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174 /* |
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175 * Define draw operators for ARGB8888 |
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176 */ |
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177 |
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178 #define DRAW_SETPIXEL_ARGB8888 \ |
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179 DRAW_SETPIXEL(ARGB8888_FROM_RGBA(*pixel, sr, sg, sb, sa)) |
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180 |
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181 #define DRAW_SETPIXEL_BLEND_ARGB8888 \ |
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182 DRAW_SETPIXEL_BLEND(RGBA_FROM_ARGB8888(*pixel, sr, sg, sb, sa), \ |
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183 ARGB8888_FROM_RGBA(*pixel, sr, sg, sb, sa)) |
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184 |
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185 #define DRAW_SETPIXEL_ADD_ARGB8888 \ |
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186 DRAW_SETPIXEL_ADD(RGBA_FROM_ARGB8888(*pixel, sr, sg, sb, sa), \ |
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187 ARGB8888_FROM_RGBA(*pixel, sr, sg, sb, sa)) |
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188 |
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189 #define DRAW_SETPIXEL_MOD_ARGB8888 \ |
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190 DRAW_SETPIXEL_MOD(RGBA_FROM_ARGB8888(*pixel, sr, sg, sb, sa), \ |
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191 ARGB8888_FROM_RGBA(*pixel, sr, sg, sb, sa)) |
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192 |
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193 #define DRAW_SETPIXELXY_ARGB8888(x, y) \ |
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194 DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_ARGB8888) |
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195 |
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196 #define DRAW_SETPIXELXY_BLEND_ARGB8888(x, y) \ |
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197 DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_BLEND_ARGB8888) |
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198 |
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199 #define DRAW_SETPIXELXY_ADD_ARGB8888(x, y) \ |
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200 DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_ADD_ARGB8888) |
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201 |
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202 #define DRAW_SETPIXELXY_MOD_ARGB8888(x, y) \ |
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203 DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_MOD_ARGB8888) |
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204 |
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205 /* |
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206 * Define draw operators for general RGB |
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207 */ |
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208 |
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209 #define DRAW_SETPIXEL_RGB \ |
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210 DRAW_SETPIXEL(PIXEL_FROM_RGB(*pixel, fmt, sr, sg, sb)) |
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211 |
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212 #define DRAW_SETPIXEL_BLEND_RGB \ |
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213 DRAW_SETPIXEL_BLEND(RGB_FROM_PIXEL(*pixel, fmt, sr, sg, sb), \ |
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214 PIXEL_FROM_RGB(*pixel, fmt, sr, sg, sb)) |
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215 |
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216 #define DRAW_SETPIXEL_ADD_RGB \ |
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217 DRAW_SETPIXEL_ADD(RGB_FROM_PIXEL(*pixel, fmt, sr, sg, sb), \ |
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218 PIXEL_FROM_RGB(*pixel, fmt, sr, sg, sb)) |
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219 |
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220 #define DRAW_SETPIXEL_MOD_RGB \ |
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221 DRAW_SETPIXEL_MOD(RGB_FROM_PIXEL(*pixel, fmt, sr, sg, sb), \ |
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222 PIXEL_FROM_RGB(*pixel, fmt, sr, sg, sb)) |
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223 |
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224 #define DRAW_SETPIXELXY2_RGB(x, y) \ |
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225 DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_RGB) |
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226 |
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227 #define DRAW_SETPIXELXY4_RGB(x, y) \ |
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228 DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_RGB) |
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229 |
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230 #define DRAW_SETPIXELXY2_BLEND_RGB(x, y) \ |
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231 DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_BLEND_RGB) |
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232 |
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233 #define DRAW_SETPIXELXY4_BLEND_RGB(x, y) \ |
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234 DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_BLEND_RGB) |
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235 |
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236 #define DRAW_SETPIXELXY2_ADD_RGB(x, y) \ |
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237 DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_ADD_RGB) |
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238 |
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239 #define DRAW_SETPIXELXY4_ADD_RGB(x, y) \ |
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240 DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_ADD_RGB) |
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241 |
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242 #define DRAW_SETPIXELXY2_MOD_RGB(x, y) \ |
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243 DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_MOD_RGB) |
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244 |
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245 #define DRAW_SETPIXELXY4_MOD_RGB(x, y) \ |
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246 DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_MOD_RGB) |
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247 |
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248 |
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249 /* |
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250 * Define draw operators for general RGBA |
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251 */ |
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252 |
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253 #define DRAW_SETPIXEL_RGBA \ |
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254 DRAW_SETPIXEL(PIXEL_FROM_RGBA(*pixel, fmt, sr, sg, sb, sa)) |
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255 |
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256 #define DRAW_SETPIXEL_BLEND_RGBA \ |
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257 DRAW_SETPIXEL_BLEND(RGBA_FROM_PIXEL(*pixel, fmt, sr, sg, sb, sa), \ |
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258 PIXEL_FROM_RGBA(*pixel, fmt, sr, sg, sb, sa)) |
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259 |
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260 #define DRAW_SETPIXEL_ADD_RGBA \ |
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261 DRAW_SETPIXEL_ADD(RGBA_FROM_PIXEL(*pixel, fmt, sr, sg, sb, sa), \ |
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262 PIXEL_FROM_RGBA(*pixel, fmt, sr, sg, sb, sa)) |
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263 |
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264 #define DRAW_SETPIXEL_MOD_RGBA \ |
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265 DRAW_SETPIXEL_MOD(RGBA_FROM_PIXEL(*pixel, fmt, sr, sg, sb, sa), \ |
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266 PIXEL_FROM_RGBA(*pixel, fmt, sr, sg, sb, sa)) |
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267 |
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268 #define DRAW_SETPIXELXY4_RGBA(x, y) \ |
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269 DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_RGBA) |
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270 |
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271 #define DRAW_SETPIXELXY4_BLEND_RGBA(x, y) \ |
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272 DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_BLEND_RGBA) |
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273 |
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274 #define DRAW_SETPIXELXY4_ADD_RGBA(x, y) \ |
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275 DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_ADD_RGBA) |
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276 |
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277 #define DRAW_SETPIXELXY4_MOD_RGBA(x, y) \ |
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278 DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_MOD_RGBA) |
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279 |
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280 /* |
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281 * Define line drawing macro |
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282 */ |
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283 |
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284 #define ABS(_x) ((_x) < 0 ? -(_x) : (_x)) |
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285 |
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286 #define BRESENHAM(x1, y1, x2, y2, op) \ |
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287 { \ |
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288 int i, deltax, deltay, numpixels; \ |
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289 int d, dinc1, dinc2; \ |
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290 int x, xinc1, xinc2; \ |
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291 int y, yinc1, yinc2; \ |
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292 \ |
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293 deltax = ABS(x2 - x1); \ |
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294 deltay = ABS(y2 - y1); \ |
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295 \ |
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296 if (deltax >= deltay) { \ |
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297 numpixels = deltax + 1; \ |
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298 d = (2 * deltay) - deltax; \ |
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299 dinc1 = deltay * 2; \ |
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300 dinc2 = (deltay - deltax) * 2; \ |
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301 xinc1 = 1; \ |
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302 xinc2 = 1; \ |
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303 yinc1 = 0; \ |
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304 yinc2 = 1; \ |
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305 } else { \ |
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306 numpixels = deltay + 1; \ |
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307 d = (2 * deltax) - deltay; \ |
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308 dinc1 = deltax * 2; \ |
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309 dinc2 = (deltax - deltay) * 2; \ |
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310 xinc1 = 0; \ |
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311 xinc2 = 1; \ |
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312 yinc1 = 1; \ |
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313 yinc2 = 1; \ |
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314 } \ |
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315 \ |
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316 if (x1 > x2) { \ |
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317 xinc1 = -xinc1; \ |
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318 xinc2 = -xinc2; \ |
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319 } \ |
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320 if (y1 > y2) { \ |
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321 yinc1 = -yinc1; \ |
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322 yinc2 = -yinc2; \ |
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323 } \ |
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324 \ |
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325 x = x1; \ |
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326 y = y1; \ |
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327 \ |
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328 for (i = 0; i < numpixels; ++i) { \ |
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329 op(x, y); \ |
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330 if (d < 0) { \ |
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331 d += dinc1; \ |
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332 x += xinc1; \ |
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333 y += yinc1; \ |
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334 } else { \ |
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335 d += dinc2; \ |
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336 x += xinc2; \ |
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337 y += yinc2; \ |
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338 } \ |
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339 } \ |
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340 } |
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341 #define DRAWLINE(x0, y0, x1, y1, op) BRESENHAM(x0, y0, x1, y1, op) |
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342 |
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343 /* |
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344 * Define blend fill macro |
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345 */ |
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346 |
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347 #define FILLRECT(type, op) \ |
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348 do { \ |
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349 int width = dstrect->w; \ |
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350 int height = dstrect->h; \ |
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351 int pitch = (dst->pitch / dst->format->BytesPerPixel); \ |
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352 int skip = pitch - width; \ |
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353 type *pixel = (type *)dst->pixels + dstrect->y * pitch + dstrect->x; \ |
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354 while (height--) { \ |
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355 { int n = (width+3)/4; \ |
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356 switch (width & 3) { \ |
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357 case 0: do { op; pixel++; \ |
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358 case 3: op; pixel++; \ |
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359 case 2: op; pixel++; \ |
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360 case 1: op; pixel++; \ |
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361 } while ( --n > 0 ); \ |
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362 } \ |
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363 } \ |
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364 pixel += skip; \ |
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365 } \ |
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366 } while (0) |
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367 |
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368 /* |
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369 * Define blend line macro |
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370 */ |
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371 |
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372 /* vi: set ts=4 sw=4 expandtab: */ |