Mercurial > sdl-ios-xcode
annotate src/video/SDL_blendline.c @ 2909:3da0bb421d83
Added line clipping
author | Sam Lantinga <slouken@libsdl.org> |
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date | Tue, 23 Dec 2008 02:23:18 +0000 |
parents | 3a9636c83849 |
children | 27d8b12e0e8e |
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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_draw.h" |
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25 |
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26 static int |
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27 SDL_BlendLine_RGB555(SDL_Surface * dst, int x1, int y1, int x2, int y2, |
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28 int blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a) |
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29 { |
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30 unsigned inva = 0xff - a; |
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31 |
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32 switch (blendMode) { |
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33 case SDL_BLENDMODE_BLEND: |
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34 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY_BLEND_RGB555); |
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35 break; |
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36 case SDL_BLENDMODE_ADD: |
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37 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY_ADD_RGB555); |
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38 break; |
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39 case SDL_BLENDMODE_MOD: |
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40 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY_MOD_RGB555); |
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41 break; |
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42 default: |
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43 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY_RGB555); |
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44 break; |
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45 } |
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46 return 0; |
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47 } |
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48 |
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49 static int |
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50 SDL_BlendLine_RGB565(SDL_Surface * dst, int x1, int y1, int x2, int y2, |
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51 int blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a) |
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52 { |
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53 unsigned inva = 0xff - a; |
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54 |
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55 switch (blendMode) { |
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56 case SDL_BLENDMODE_BLEND: |
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57 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY_BLEND_RGB565); |
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58 break; |
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59 case SDL_BLENDMODE_ADD: |
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60 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY_ADD_RGB565); |
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61 break; |
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62 case SDL_BLENDMODE_MOD: |
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63 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY_MOD_RGB565); |
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64 break; |
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65 default: |
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66 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY_RGB565); |
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67 break; |
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68 } |
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69 return 0; |
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70 } |
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71 |
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72 static int |
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73 SDL_BlendLine_RGB888(SDL_Surface * dst, int x1, int y1, int x2, int y2, |
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74 int blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a) |
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75 { |
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76 unsigned inva = 0xff - a; |
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77 |
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78 switch (blendMode) { |
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79 case SDL_BLENDMODE_BLEND: |
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80 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY_BLEND_RGB888); |
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81 break; |
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82 case SDL_BLENDMODE_ADD: |
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83 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY_ADD_RGB888); |
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84 break; |
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85 case SDL_BLENDMODE_MOD: |
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86 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY_MOD_RGB888); |
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87 break; |
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88 default: |
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89 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY_RGB888); |
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90 break; |
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91 } |
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92 return 0; |
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93 } |
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94 |
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95 static int |
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96 SDL_BlendLine_ARGB8888(SDL_Surface * dst, int x1, int y1, int x2, int y2, |
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97 int blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a) |
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98 { |
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99 unsigned inva = 0xff - a; |
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100 |
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101 switch (blendMode) { |
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102 case SDL_BLENDMODE_BLEND: |
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103 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY_BLEND_ARGB8888); |
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104 break; |
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105 case SDL_BLENDMODE_ADD: |
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106 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY_ADD_ARGB8888); |
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107 break; |
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108 case SDL_BLENDMODE_MOD: |
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109 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY_MOD_ARGB8888); |
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110 break; |
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111 default: |
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112 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY_ARGB8888); |
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113 break; |
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114 } |
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115 return 0; |
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116 } |
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117 |
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118 static int |
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119 SDL_BlendLine_RGB(SDL_Surface * dst, int x1, int y1, int x2, int y2, |
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120 int blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a) |
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121 { |
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122 SDL_PixelFormat *fmt = dst->format; |
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123 unsigned inva = 0xff - a; |
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124 |
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125 switch (fmt->BytesPerPixel) { |
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126 case 2: |
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127 switch (blendMode) { |
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128 case SDL_BLENDMODE_BLEND: |
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129 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY2_BLEND_RGB); |
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130 break; |
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131 case SDL_BLENDMODE_ADD: |
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132 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY2_ADD_RGB); |
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133 break; |
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134 case SDL_BLENDMODE_MOD: |
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135 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY2_MOD_RGB); |
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136 break; |
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137 default: |
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138 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY2_RGB); |
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139 break; |
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140 } |
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141 return 0; |
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142 case 4: |
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143 switch (blendMode) { |
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144 case SDL_BLENDMODE_BLEND: |
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145 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY4_BLEND_RGB); |
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146 break; |
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147 case SDL_BLENDMODE_ADD: |
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148 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY4_ADD_RGB); |
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149 break; |
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150 case SDL_BLENDMODE_MOD: |
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151 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY4_MOD_RGB); |
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152 break; |
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153 default: |
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154 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY4_RGB); |
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155 break; |
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156 } |
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157 return 0; |
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158 default: |
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159 SDL_Unsupported(); |
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160 return -1; |
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161 } |
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162 } |
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163 |
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164 static int |
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165 SDL_BlendLine_RGBA(SDL_Surface * dst, int x1, int y1, int x2, int y2, |
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166 int blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a) |
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167 { |
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168 SDL_PixelFormat *fmt = dst->format; |
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169 unsigned inva = 0xff - a; |
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170 |
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171 switch (fmt->BytesPerPixel) { |
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172 case 4: |
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173 switch (blendMode) { |
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174 case SDL_BLENDMODE_BLEND: |
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175 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY4_BLEND_RGBA); |
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176 break; |
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177 case SDL_BLENDMODE_ADD: |
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178 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY4_ADD_RGBA); |
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179 break; |
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180 case SDL_BLENDMODE_MOD: |
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181 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY4_MOD_RGBA); |
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182 break; |
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183 default: |
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184 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY4_RGBA); |
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185 break; |
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186 } |
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187 return 0; |
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188 default: |
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189 SDL_Unsupported(); |
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190 return -1; |
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191 } |
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192 } |
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193 |
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194 int |
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195 SDL_BlendLine(SDL_Surface * dst, int x1, int y1, int x2, int y2, |
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196 int blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a) |
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197 { |
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198 SDL_PixelFormat *fmt = dst->format; |
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199 |
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200 /* This function doesn't work on surfaces < 8 bpp */ |
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201 if (dst->format->BitsPerPixel < 8) { |
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202 SDL_SetError("SDL_BlendLine(): Unsupported surface format"); |
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203 return (-1); |
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204 } |
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205 |
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206 /* Perform clipping */ |
2909 | 207 if (!SDL_IntersectRectAndLine(&dst->clip_rect, &x1, &x2, &y1, &y2)) { |
208 return (0); | |
209 } | |
210 | |
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211 |
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212 if ((blendMode == SDL_BLENDMODE_BLEND) |
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213 || (blendMode == SDL_BLENDMODE_ADD)) { |
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214 r = DRAW_MUL(r, a); |
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215 g = DRAW_MUL(g, a); |
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216 b = DRAW_MUL(b, a); |
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217 } |
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218 |
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219 switch (fmt->BitsPerPixel) { |
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220 case 15: |
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221 switch (fmt->Rmask) { |
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222 case 0x7C00: |
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223 return SDL_BlendLine_RGB555(dst, x1, y1, x2, y2, blendMode, r, g, |
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224 b, a); |
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225 } |
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226 break; |
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227 case 16: |
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228 switch (fmt->Rmask) { |
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229 case 0xF800: |
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230 return SDL_BlendLine_RGB565(dst, x1, y1, x2, y2, blendMode, r, g, |
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231 b, a); |
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232 } |
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233 break; |
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234 case 32: |
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235 switch (fmt->Rmask) { |
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236 case 0x00FF0000: |
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237 if (!fmt->Amask) { |
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238 return SDL_BlendLine_RGB888(dst, x1, y1, x2, y2, blendMode, r, |
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239 g, b, a); |
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240 } else { |
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241 return SDL_BlendLine_ARGB8888(dst, x1, y1, x2, y2, blendMode, |
a0c837a16e4c
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242 r, g, b, a); |
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243 } |
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244 break; |
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245 } |
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246 default: |
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247 break; |
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248 } |
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249 |
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250 if (!fmt->Amask) { |
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251 return SDL_BlendLine_RGB(dst, x1, y1, x2, y2, blendMode, r, g, b, a); |
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252 } else { |
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253 return SDL_BlendLine_RGBA(dst, x1, y1, x2, y2, blendMode, r, g, b, a); |
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254 } |
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255 } |
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256 |
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257 /* vi: set ts=4 sw=4 expandtab: */ |