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annotate src/video/SDL_blendrect.c @ 2993:2fad80c77c17

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Technically more correct
author Sam Lantinga <slouken@libsdl.org>
date Sun, 04 Jan 2009 19:26:50 +0000
parents 3a9636c83849
children 0267b8b1595c
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2009 Sam Lantinga
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4
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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.
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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,
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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.
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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
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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_video.h"
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25 #include "SDL_draw.h"
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26
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27 static int
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28 SDL_BlendRect_RGB555(SDL_Surface * dst, SDL_Rect * dstrect, int blendMode,
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29 Uint8 r, Uint8 g, Uint8 b, Uint8 a)
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30 {
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31 unsigned inva = 0xff - a;
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32
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33 switch (blendMode) {
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34 case SDL_BLENDMODE_BLEND:
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35 FILLRECT(Uint16, DRAW_SETPIXEL_BLEND_RGB555);
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36 break;
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37 case SDL_BLENDMODE_ADD:
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38 FILLRECT(Uint16, DRAW_SETPIXEL_ADD_RGB555);
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39 break;
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40 case SDL_BLENDMODE_MOD:
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41 FILLRECT(Uint16, DRAW_SETPIXEL_MOD_RGB555);
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42 break;
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43 default:
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44 FILLRECT(Uint16, DRAW_SETPIXEL_RGB555);
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45 break;
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46 }
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47 return 0;
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48 }
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49
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50 static int
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51 SDL_BlendRect_RGB565(SDL_Surface * dst, SDL_Rect * dstrect, int blendMode,
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52 Uint8 r, Uint8 g, Uint8 b, Uint8 a)
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53 {
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54 unsigned inva = 0xff - a;
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55
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56 switch (blendMode) {
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57 case SDL_BLENDMODE_BLEND:
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58 FILLRECT(Uint16, DRAW_SETPIXEL_BLEND_RGB565);
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59 break;
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60 case SDL_BLENDMODE_ADD:
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61 FILLRECT(Uint16, DRAW_SETPIXEL_ADD_RGB565);
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62 break;
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63 case SDL_BLENDMODE_MOD:
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64 FILLRECT(Uint16, DRAW_SETPIXEL_MOD_RGB565);
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65 break;
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66 default:
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67 FILLRECT(Uint16, DRAW_SETPIXEL_RGB565);
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68 break;
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69 }
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70 return 0;
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71 }
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72
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73 static int
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74 SDL_BlendRect_RGB888(SDL_Surface * dst, SDL_Rect * dstrect, int blendMode,
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75 Uint8 r, Uint8 g, Uint8 b, Uint8 a)
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76 {
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77 unsigned inva = 0xff - a;
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78
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79 switch (blendMode) {
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80 case SDL_BLENDMODE_BLEND:
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81 FILLRECT(Uint32, DRAW_SETPIXEL_BLEND_RGB888);
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82 break;
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83 case SDL_BLENDMODE_ADD:
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84 FILLRECT(Uint32, DRAW_SETPIXEL_ADD_RGB888);
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85 break;
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86 case SDL_BLENDMODE_MOD:
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87 FILLRECT(Uint32, DRAW_SETPIXEL_MOD_RGB888);
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88 break;
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89 default:
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90 FILLRECT(Uint32, DRAW_SETPIXEL_RGB888);
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91 break;
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92 }
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93 return 0;
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94 }
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95
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96 static int
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97 SDL_BlendRect_ARGB8888(SDL_Surface * dst, SDL_Rect * dstrect, int blendMode,
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98 Uint8 r, Uint8 g, Uint8 b, Uint8 a)
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99 {
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100 unsigned inva = 0xff - a;
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101
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102 switch (blendMode) {
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103 case SDL_BLENDMODE_BLEND:
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104 FILLRECT(Uint32, DRAW_SETPIXEL_BLEND_ARGB8888);
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105 break;
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106 case SDL_BLENDMODE_ADD:
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107 FILLRECT(Uint32, DRAW_SETPIXEL_ADD_ARGB8888);
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108 break;
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109 case SDL_BLENDMODE_MOD:
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110 FILLRECT(Uint32, DRAW_SETPIXEL_MOD_ARGB8888);
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111 break;
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112 default:
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113 FILLRECT(Uint32, DRAW_SETPIXEL_ARGB8888);
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114 break;
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115 }
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116 return 0;
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117 }
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118
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119 static int
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120 SDL_BlendRect_RGB(SDL_Surface * dst, SDL_Rect * dstrect, int blendMode,
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121 Uint8 r, Uint8 g, Uint8 b, Uint8 a)
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122 {
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123 SDL_PixelFormat *fmt = dst->format;
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124 unsigned inva = 0xff - a;
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125
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126 switch (fmt->BytesPerPixel) {
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127 case 2:
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128 switch (blendMode) {
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129 case SDL_BLENDMODE_BLEND:
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130 FILLRECT(Uint16, DRAW_SETPIXEL_BLEND_RGB);
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131 break;
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132 case SDL_BLENDMODE_ADD:
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133 FILLRECT(Uint16, DRAW_SETPIXEL_ADD_RGB);
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134 break;
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135 case SDL_BLENDMODE_MOD:
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136 FILLRECT(Uint16, DRAW_SETPIXEL_MOD_RGB);
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137 break;
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138 default:
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139 FILLRECT(Uint16, DRAW_SETPIXEL_RGB);
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140 break;
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parents: 2896
diff changeset
141 }
e40448bc7727 Share code between fill and line drawing
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parents: 2896
diff changeset
142 return 0;
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parents: 2896
diff changeset
143 case 4:
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diff changeset
144 switch (blendMode) {
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diff changeset
145 case SDL_BLENDMODE_BLEND:
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146 FILLRECT(Uint32, DRAW_SETPIXEL_BLEND_RGB);
2898
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diff changeset
147 break;
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148 case SDL_BLENDMODE_ADD:
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149 FILLRECT(Uint32, DRAW_SETPIXEL_ADD_RGB);
2898
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150 break;
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diff changeset
151 case SDL_BLENDMODE_MOD:
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152 FILLRECT(Uint32, DRAW_SETPIXEL_MOD_RGB);
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153 break;
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diff changeset
154 default:
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155 FILLRECT(Uint32, DRAW_SETPIXEL_RGB);
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diff changeset
156 break;
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parents: 2896
diff changeset
157 }
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parents: 2896
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158 return 0;
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parents: 2896
diff changeset
159 default:
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parents: 2896
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160 SDL_Unsupported();
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diff changeset
161 return -1;
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parents: 2896
diff changeset
162 }
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parents: 2896
diff changeset
163 }
2896
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164
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165 static int
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diff changeset
166 SDL_BlendRect_RGBA(SDL_Surface * dst, SDL_Rect * dstrect, int blendMode,
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diff changeset
167 Uint8 r, Uint8 g, Uint8 b, Uint8 a)
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168 {
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169 SDL_PixelFormat *fmt = dst->format;
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170 unsigned inva = 0xff - a;
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171
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parents: 2896
diff changeset
172 switch (fmt->BytesPerPixel) {
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parents: 2896
diff changeset
173 case 4:
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diff changeset
174 switch (blendMode) {
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175 case SDL_BLENDMODE_BLEND:
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176 FILLRECT(Uint32, DRAW_SETPIXEL_BLEND_RGBA);
2898
e40448bc7727 Share code between fill and line drawing
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177 break;
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178 case SDL_BLENDMODE_ADD:
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diff changeset
179 FILLRECT(Uint32, DRAW_SETPIXEL_ADD_RGBA);
2898
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180 break;
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181 case SDL_BLENDMODE_MOD:
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182 FILLRECT(Uint32, DRAW_SETPIXEL_MOD_RGBA);
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diff changeset
183 break;
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diff changeset
184 default:
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185 FILLRECT(Uint32, DRAW_SETPIXEL_RGBA);
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diff changeset
186 break;
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parents: 2896
diff changeset
187 }
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diff changeset
188 return 0;
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parents: 2896
diff changeset
189 default:
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diff changeset
190 SDL_Unsupported();
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diff changeset
191 return -1;
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parents: 2896
diff changeset
192 }
e40448bc7727 Share code between fill and line drawing
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parents: 2896
diff changeset
193 }
2888
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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parents:
diff changeset
194
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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parents:
diff changeset
195 int
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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parents:
diff changeset
196 SDL_BlendRect(SDL_Surface * dst, SDL_Rect * dstrect, int blendMode, Uint8 r,
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
197 Uint8 g, Uint8 b, Uint8 a)
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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parents:
diff changeset
198 {
2898
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diff changeset
199 SDL_PixelFormat *fmt = dst->format;
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diff changeset
200
2888
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
201 /* This function doesn't work on surfaces < 8 bpp */
2898
e40448bc7727 Share code between fill and line drawing
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diff changeset
202 if (fmt->BitsPerPixel < 8) {
2888
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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parents:
diff changeset
203 SDL_SetError("SDL_BlendRect(): Unsupported surface format");
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
204 return (-1);
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
205 }
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
206
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
207 /* If 'dstrect' == NULL, then fill the whole surface */
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
208 if (dstrect) {
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
209 /* Perform clipping */
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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parents:
diff changeset
210 if (!SDL_IntersectRect(dstrect, &dst->clip_rect, dstrect)) {
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
211 return (0);
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
212 }
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
213 } else {
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
214 dstrect = &dst->clip_rect;
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
215 }
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
216
2896
1ef2f1e75ff7 Date: Sat, 20 Dec 2008 23:25:19 +0100
Sam Lantinga <slouken@libsdl.org>
parents: 2888
diff changeset
217 if ((blendMode == SDL_BLENDMODE_BLEND)
1ef2f1e75ff7 Date: Sat, 20 Dec 2008 23:25:19 +0100
Sam Lantinga <slouken@libsdl.org>
parents: 2888
diff changeset
218 || (blendMode == SDL_BLENDMODE_ADD)) {
2898
e40448bc7727 Share code between fill and line drawing
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parents: 2896
diff changeset
219 r = DRAW_MUL(r, a);
e40448bc7727 Share code between fill and line drawing
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diff changeset
220 g = DRAW_MUL(g, a);
e40448bc7727 Share code between fill and line drawing
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parents: 2896
diff changeset
221 b = DRAW_MUL(b, a);
2896
1ef2f1e75ff7 Date: Sat, 20 Dec 2008 23:25:19 +0100
Sam Lantinga <slouken@libsdl.org>
parents: 2888
diff changeset
222 }
2898
e40448bc7727 Share code between fill and line drawing
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diff changeset
223
e40448bc7727 Share code between fill and line drawing
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parents: 2896
diff changeset
224 switch (fmt->BitsPerPixel) {
2896
1ef2f1e75ff7 Date: Sat, 20 Dec 2008 23:25:19 +0100
Sam Lantinga <slouken@libsdl.org>
parents: 2888
diff changeset
225 case 15:
2898
e40448bc7727 Share code between fill and line drawing
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parents: 2896
diff changeset
226 switch (fmt->Rmask) {
e40448bc7727 Share code between fill and line drawing
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parents: 2896
diff changeset
227 case 0x7C00:
e40448bc7727 Share code between fill and line drawing
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parents: 2896
diff changeset
228 return SDL_BlendRect_RGB555(dst, dstrect, blendMode, r, g, b, a);
2896
1ef2f1e75ff7 Date: Sat, 20 Dec 2008 23:25:19 +0100
Sam Lantinga <slouken@libsdl.org>
parents: 2888
diff changeset
229 }
1ef2f1e75ff7 Date: Sat, 20 Dec 2008 23:25:19 +0100
Sam Lantinga <slouken@libsdl.org>
parents: 2888
diff changeset
230 break;
1ef2f1e75ff7 Date: Sat, 20 Dec 2008 23:25:19 +0100
Sam Lantinga <slouken@libsdl.org>
parents: 2888
diff changeset
231 case 16:
2898
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
232 switch (fmt->Rmask) {
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
233 case 0xF800:
e40448bc7727 Share code between fill and line drawing
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parents: 2896
diff changeset
234 return SDL_BlendRect_RGB565(dst, dstrect, blendMode, r, g, b, a);
2896
1ef2f1e75ff7 Date: Sat, 20 Dec 2008 23:25:19 +0100
Sam Lantinga <slouken@libsdl.org>
parents: 2888
diff changeset
235 }
1ef2f1e75ff7 Date: Sat, 20 Dec 2008 23:25:19 +0100
Sam Lantinga <slouken@libsdl.org>
parents: 2888
diff changeset
236 break;
1ef2f1e75ff7 Date: Sat, 20 Dec 2008 23:25:19 +0100
Sam Lantinga <slouken@libsdl.org>
parents: 2888
diff changeset
237 case 32:
2898
e40448bc7727 Share code between fill and line drawing
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parents: 2896
diff changeset
238 switch (fmt->Rmask) {
e40448bc7727 Share code between fill and line drawing
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parents: 2896
diff changeset
239 case 0x00FF0000:
e40448bc7727 Share code between fill and line drawing
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parents: 2896
diff changeset
240 if (!fmt->Amask) {
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
241 return SDL_BlendRect_RGB888(dst, dstrect, blendMode, r, g, b,
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
242 a);
2899
a0c837a16e4c Added ARGB optimized case for Mac OS X
Sam Lantinga <slouken@libsdl.org>
parents: 2898
diff changeset
243 } else {
a0c837a16e4c Added ARGB optimized case for Mac OS X
Sam Lantinga <slouken@libsdl.org>
parents: 2898
diff changeset
244 return SDL_BlendRect_ARGB8888(dst, dstrect, blendMode, r, g,
a0c837a16e4c Added ARGB optimized case for Mac OS X
Sam Lantinga <slouken@libsdl.org>
parents: 2898
diff changeset
245 b, a);
2898
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
246 }
2896
1ef2f1e75ff7 Date: Sat, 20 Dec 2008 23:25:19 +0100
Sam Lantinga <slouken@libsdl.org>
parents: 2888
diff changeset
247 break;
1ef2f1e75ff7 Date: Sat, 20 Dec 2008 23:25:19 +0100
Sam Lantinga <slouken@libsdl.org>
parents: 2888
diff changeset
248 }
2898
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
249 default:
2896
1ef2f1e75ff7 Date: Sat, 20 Dec 2008 23:25:19 +0100
Sam Lantinga <slouken@libsdl.org>
parents: 2888
diff changeset
250 break;
1ef2f1e75ff7 Date: Sat, 20 Dec 2008 23:25:19 +0100
Sam Lantinga <slouken@libsdl.org>
parents: 2888
diff changeset
251 }
2898
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
252
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
253 if (!fmt->Amask) {
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
254 return SDL_BlendRect_RGB(dst, dstrect, blendMode, r, g, b, a);
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
255 } else {
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
256 return SDL_BlendRect_RGBA(dst, dstrect, blendMode, r, g, b, a);
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
257 }
2888
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
258 }
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
259
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
260 /* vi: set ts=4 sw=4 expandtab: */