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annotate src/video/SDL_blendline.c @ 2899:a0c837a16e4c

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Added ARGB optimized case for Mac OS X
author Sam Lantinga <slouken@libsdl.org>
date Sun, 21 Dec 2008 08:55:06 +0000
parents e40448bc7727
children 3a9636c83849
rev   line source
2888
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
Sam Lantinga <slouken@libsdl.org>
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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
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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5 This library is free software; you can redistribute it and/or
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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6 modify it under the terms of the GNU Lesser General Public
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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7 License as published by the Free Software Foundation; either
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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8 version 2.1 of the License, or (at your option) any later version.
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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9
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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10 This library is distributed in the hope that it will be useful,
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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13 Lesser General Public License for more details.
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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14
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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15 You should have received a copy of the GNU Lesser General Public
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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16 License along with this library; if not, write to the Free Software
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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18
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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19 Sam Lantinga
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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20 slouken@libsdl.org
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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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_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 BRESENHAM(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 BRESENHAM(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 BRESENHAM(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 BRESENHAM(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 BRESENHAM(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 BRESENHAM(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 BRESENHAM(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 BRESENHAM(x1, y1, x2, y2, DRAW_SETPIXELXY2_RGB);
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139 break;
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parents: 2896
diff changeset
140 }
e40448bc7727 Share code between fill and line drawing
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diff changeset
141 return 0;
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diff changeset
142 case 4:
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diff changeset
143 switch (blendMode) {
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diff changeset
144 case SDL_BLENDMODE_BLEND:
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145 BRESENHAM(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 BRESENHAM(x1, y1, x2, y2, DRAW_SETPIXELXY4_ADD_RGB);
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149 break;
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diff changeset
150 case SDL_BLENDMODE_MOD:
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151 BRESENHAM(x1, y1, x2, y2, DRAW_SETPIXELXY4_MOD_RGB);
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152 break;
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diff changeset
153 default:
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diff changeset
154 BRESENHAM(x1, y1, x2, y2, DRAW_SETPIXELXY4_RGB);
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155 break;
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parents: 2896
diff changeset
156 }
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parents: 2896
diff changeset
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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parents: 2896
diff changeset
161 }
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parents: 2896
diff changeset
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
2898
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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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diff changeset
174 case SDL_BLENDMODE_BLEND:
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175 BRESENHAM(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 BRESENHAM(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 BRESENHAM(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 BRESENHAM(x1, y1, x2, y2, DRAW_SETPIXELXY4_RGBA);
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185 break;
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diff changeset
186 }
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diff changeset
187 return 0;
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diff changeset
188 default:
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diff changeset
189 SDL_Unsupported();
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190 return -1;
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parents: 2896
diff changeset
191 }
e40448bc7727 Share code between fill and line drawing
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diff changeset
192 }
2888
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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parents:
diff changeset
193
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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parents:
diff changeset
194 int
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parents:
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195 SDL_BlendLine(SDL_Surface * dst, int x1, int y1, int x2, int y2,
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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parents:
diff changeset
196 int blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
197 {
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diff changeset
198 SDL_PixelFormat *fmt = dst->format;
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199
2888
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parents:
diff changeset
200 /* This function doesn't work on surfaces < 8 bpp */
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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parents:
diff changeset
201 if (dst->format->BitsPerPixel < 8) {
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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parents:
diff changeset
202 SDL_SetError("SDL_BlendLine(): Unsupported surface format");
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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parents:
diff changeset
203 return (-1);
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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parents:
diff changeset
204 }
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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parents:
diff changeset
205
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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parents:
diff changeset
206 /* Perform clipping */
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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parents:
diff changeset
207 /* FIXME
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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parents:
diff changeset
208 if (!SDL_IntersectRect(dstrect, &dst->clip_rect, dstrect)) {
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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parents:
diff changeset
209 return (0);
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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parents:
diff changeset
210 }
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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parents:
diff changeset
211 */
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
212
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diff changeset
213 if ((blendMode == SDL_BLENDMODE_BLEND)
1ef2f1e75ff7 Date: Sat, 20 Dec 2008 23:25:19 +0100
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diff changeset
214 || (blendMode == SDL_BLENDMODE_ADD)) {
2898
e40448bc7727 Share code between fill and line drawing
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diff changeset
215 r = DRAW_MUL(r, a);
e40448bc7727 Share code between fill and line drawing
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diff changeset
216 g = DRAW_MUL(g, a);
e40448bc7727 Share code between fill and line drawing
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diff changeset
217 b = DRAW_MUL(b, a);
2896
1ef2f1e75ff7 Date: Sat, 20 Dec 2008 23:25:19 +0100
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diff changeset
218 }
2898
e40448bc7727 Share code between fill and line drawing
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diff changeset
219
e40448bc7727 Share code between fill and line drawing
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diff changeset
220 switch (fmt->BitsPerPixel) {
2896
1ef2f1e75ff7 Date: Sat, 20 Dec 2008 23:25:19 +0100
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parents: 2888
diff changeset
221 case 15:
2898
e40448bc7727 Share code between fill and line drawing
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diff changeset
222 switch (fmt->Rmask) {
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diff changeset
223 case 0x7C00:
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diff changeset
224 return SDL_BlendLine_RGB555(dst, x1, y1, x2, y2, blendMode, r, g,
e40448bc7727 Share code between fill and line drawing
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parents: 2896
diff changeset
225 b, a);
2896
1ef2f1e75ff7 Date: Sat, 20 Dec 2008 23:25:19 +0100
Sam Lantinga <slouken@libsdl.org>
parents: 2888
diff changeset
226 }
1ef2f1e75ff7 Date: Sat, 20 Dec 2008 23:25:19 +0100
Sam Lantinga <slouken@libsdl.org>
parents: 2888
diff changeset
227 break;
1ef2f1e75ff7 Date: Sat, 20 Dec 2008 23:25:19 +0100
Sam Lantinga <slouken@libsdl.org>
parents: 2888
diff changeset
228 case 16:
2898
e40448bc7727 Share code between fill and line drawing
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diff changeset
229 switch (fmt->Rmask) {
e40448bc7727 Share code between fill and line drawing
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parents: 2896
diff changeset
230 case 0xF800:
e40448bc7727 Share code between fill and line drawing
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parents: 2896
diff changeset
231 return SDL_BlendLine_RGB565(dst, x1, y1, x2, y2, blendMode, r, g,
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
232 b, a);
2896
1ef2f1e75ff7 Date: Sat, 20 Dec 2008 23:25:19 +0100
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parents: 2888
diff changeset
233 }
1ef2f1e75ff7 Date: Sat, 20 Dec 2008 23:25:19 +0100
Sam Lantinga <slouken@libsdl.org>
parents: 2888
diff changeset
234 break;
1ef2f1e75ff7 Date: Sat, 20 Dec 2008 23:25:19 +0100
Sam Lantinga <slouken@libsdl.org>
parents: 2888
diff changeset
235 case 32:
2898
e40448bc7727 Share code between fill and line drawing
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parents: 2896
diff changeset
236 switch (fmt->Rmask) {
e40448bc7727 Share code between fill and line drawing
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parents: 2896
diff changeset
237 case 0x00FF0000:
e40448bc7727 Share code between fill and line drawing
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parents: 2896
diff changeset
238 if (!fmt->Amask) {
e40448bc7727 Share code between fill and line drawing
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parents: 2896
diff changeset
239 return SDL_BlendLine_RGB888(dst, x1, y1, x2, y2, blendMode, r,
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
240 g, b, a);
2899
a0c837a16e4c Added ARGB optimized case for Mac OS X
Sam Lantinga <slouken@libsdl.org>
parents: 2898
diff changeset
241 } else {
a0c837a16e4c Added ARGB optimized case for Mac OS X
Sam Lantinga <slouken@libsdl.org>
parents: 2898
diff changeset
242 return SDL_BlendLine_ARGB8888(dst, x1, y1, x2, y2, blendMode,
a0c837a16e4c Added ARGB optimized case for Mac OS X
Sam Lantinga <slouken@libsdl.org>
parents: 2898
diff changeset
243 r, g, b, a);
2898
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
244 }
2896
1ef2f1e75ff7 Date: Sat, 20 Dec 2008 23:25:19 +0100
Sam Lantinga <slouken@libsdl.org>
parents: 2888
diff changeset
245 break;
1ef2f1e75ff7 Date: Sat, 20 Dec 2008 23:25:19 +0100
Sam Lantinga <slouken@libsdl.org>
parents: 2888
diff changeset
246 }
2898
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
247 default:
2896
1ef2f1e75ff7 Date: Sat, 20 Dec 2008 23:25:19 +0100
Sam Lantinga <slouken@libsdl.org>
parents: 2888
diff changeset
248 break;
1ef2f1e75ff7 Date: Sat, 20 Dec 2008 23:25:19 +0100
Sam Lantinga <slouken@libsdl.org>
parents: 2888
diff changeset
249 }
2898
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
250
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
251 if (!fmt->Amask) {
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
252 return SDL_BlendLine_RGB(dst, x1, y1, x2, y2, blendMode, r, g, b, a);
e40448bc7727 Share code between fill and line drawing
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parents: 2896
diff changeset
253 } else {
e40448bc7727 Share code between fill and line drawing
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parents: 2896
diff changeset
254 return SDL_BlendLine_RGBA(dst, x1, y1, x2, y2, blendMode, r, g, b, a);
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
255 }
2888
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
256 }
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
257
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
258 /* vi: set ts=4 sw=4 expandtab: */