Mercurial > sdl-ios-xcode
annotate src/video/SDL_blendline.c @ 2898:e40448bc7727
Share code between fill and line drawing
Added general RGB surface format fallbacks to drawing code
Fixed issues with destination surface alpha channel
author | Sam Lantinga <slouken@libsdl.org> |
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date | Sun, 21 Dec 2008 08:28:25 +0000 |
parents | 1ef2f1e75ff7 |
children | a0c837a16e4c |
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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 BRESENHAM(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 BRESENHAM(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 BRESENHAM(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 BRESENHAM(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 BRESENHAM(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 BRESENHAM(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 BRESENHAM(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 BRESENHAM(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 BRESENHAM(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 BRESENHAM(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 BRESENHAM(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 BRESENHAM(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_RGB(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 SDL_PixelFormat *fmt = dst->format; |
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100 unsigned inva = 0xff - a; |
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101 |
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102 switch (fmt->BytesPerPixel) { |
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103 case 2: |
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104 switch (blendMode) { |
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105 case SDL_BLENDMODE_BLEND: |
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106 BRESENHAM(x1, y1, x2, y2, DRAW_SETPIXELXY2_BLEND_RGB); |
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107 break; |
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108 case SDL_BLENDMODE_ADD: |
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109 BRESENHAM(x1, y1, x2, y2, DRAW_SETPIXELXY2_ADD_RGB); |
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110 break; |
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111 case SDL_BLENDMODE_MOD: |
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112 BRESENHAM(x1, y1, x2, y2, DRAW_SETPIXELXY2_MOD_RGB); |
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113 break; |
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114 default: |
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115 BRESENHAM(x1, y1, x2, y2, DRAW_SETPIXELXY2_RGB); |
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116 break; |
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117 } |
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118 return 0; |
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119 case 4: |
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120 switch (blendMode) { |
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121 case SDL_BLENDMODE_BLEND: |
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122 BRESENHAM(x1, y1, x2, y2, DRAW_SETPIXELXY4_BLEND_RGB); |
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123 break; |
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124 case SDL_BLENDMODE_ADD: |
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125 BRESENHAM(x1, y1, x2, y2, DRAW_SETPIXELXY4_ADD_RGB); |
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126 break; |
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127 case SDL_BLENDMODE_MOD: |
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128 BRESENHAM(x1, y1, x2, y2, DRAW_SETPIXELXY4_MOD_RGB); |
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129 break; |
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130 default: |
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131 BRESENHAM(x1, y1, x2, y2, DRAW_SETPIXELXY4_RGB); |
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132 break; |
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133 } |
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134 return 0; |
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135 default: |
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136 SDL_Unsupported(); |
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137 return -1; |
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138 } |
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139 } |
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140 |
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141 static int |
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142 SDL_BlendLine_RGBA(SDL_Surface * dst, int x1, int y1, int x2, int y2, |
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143 int blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a) |
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144 { |
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145 SDL_PixelFormat *fmt = dst->format; |
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146 unsigned inva = 0xff - a; |
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147 |
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148 switch (fmt->BytesPerPixel) { |
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149 case 4: |
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150 switch (blendMode) { |
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151 case SDL_BLENDMODE_BLEND: |
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152 BRESENHAM(x1, y1, x2, y2, DRAW_SETPIXELXY4_BLEND_RGBA); |
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153 break; |
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154 case SDL_BLENDMODE_ADD: |
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155 BRESENHAM(x1, y1, x2, y2, DRAW_SETPIXELXY4_ADD_RGBA); |
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156 break; |
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157 case SDL_BLENDMODE_MOD: |
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158 BRESENHAM(x1, y1, x2, y2, DRAW_SETPIXELXY4_MOD_RGBA); |
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159 break; |
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160 default: |
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161 BRESENHAM(x1, y1, x2, y2, DRAW_SETPIXELXY4_RGBA); |
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162 break; |
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163 } |
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164 return 0; |
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165 default: |
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166 SDL_Unsupported(); |
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167 return -1; |
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168 } |
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169 } |
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170 |
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171 int |
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172 SDL_BlendLine(SDL_Surface * dst, int x1, int y1, int x2, int y2, |
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173 int blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a) |
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174 { |
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175 SDL_PixelFormat *fmt = dst->format; |
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176 |
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177 /* This function doesn't work on surfaces < 8 bpp */ |
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178 if (dst->format->BitsPerPixel < 8) { |
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179 SDL_SetError("SDL_BlendLine(): Unsupported surface format"); |
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180 return (-1); |
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181 } |
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182 |
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183 /* Perform clipping */ |
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184 /* FIXME |
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185 if (!SDL_IntersectRect(dstrect, &dst->clip_rect, dstrect)) { |
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186 return (0); |
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187 } |
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188 */ |
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189 |
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190 if ((blendMode == SDL_BLENDMODE_BLEND) |
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191 || (blendMode == SDL_BLENDMODE_ADD)) { |
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192 r = DRAW_MUL(r, a); |
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193 g = DRAW_MUL(g, a); |
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194 b = DRAW_MUL(b, a); |
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195 } |
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196 |
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197 switch (fmt->BitsPerPixel) { |
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198 case 15: |
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199 switch (fmt->Rmask) { |
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200 case 0x7C00: |
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201 return SDL_BlendLine_RGB555(dst, x1, y1, x2, y2, blendMode, r, g, |
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202 b, a); |
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203 } |
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204 break; |
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205 case 16: |
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206 switch (fmt->Rmask) { |
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207 case 0xF800: |
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208 return SDL_BlendLine_RGB565(dst, x1, y1, x2, y2, blendMode, r, g, |
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209 b, a); |
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210 } |
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211 break; |
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212 case 32: |
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213 switch (fmt->Rmask) { |
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214 case 0x00FF0000: |
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215 if (!fmt->Amask) { |
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216 return SDL_BlendLine_RGB888(dst, x1, y1, x2, y2, blendMode, r, |
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217 g, b, a); |
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218 } |
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219 break; |
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220 } |
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221 default: |
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222 break; |
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223 } |
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224 |
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225 if (!fmt->Amask) { |
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226 return SDL_BlendLine_RGB(dst, x1, y1, x2, y2, blendMode, r, g, b, a); |
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227 } else { |
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228 return SDL_BlendLine_RGBA(dst, x1, y1, x2, y2, blendMode, r, g, b, a); |
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229 } |
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230 } |
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231 |
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232 /* vi: set ts=4 sw=4 expandtab: */ |