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annotate src/video/SDL_blendrect.c @ 2898:e40448bc7727

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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>
date Sun, 21 Dec 2008 08:28:25 +0000
parents 1ef2f1e75ff7
children a0c837a16e4c
rev   line source
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32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
Sam Lantinga <slouken@libsdl.org>
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1 /*
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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2 SDL - Simple DirectMedia Layer
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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3 Copyright (C) 1997-2009 Sam Lantinga
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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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
Sam Lantinga <slouken@libsdl.org>
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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
Sam Lantinga <slouken@libsdl.org>
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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
Sam Lantinga <slouken@libsdl.org>
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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
Sam Lantinga <slouken@libsdl.org>
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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
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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18
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
Sam Lantinga <slouken@libsdl.org>
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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 */
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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22 #include "SDL_config.h"
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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23
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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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,
e40448bc7727 Share code between fill and line drawing
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29 Uint8 r, Uint8 g, Uint8 b, Uint8 a)
e40448bc7727 Share code between fill and line drawing
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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) {
e40448bc7727 Share code between fill and line drawing
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34 case SDL_BLENDMODE_BLEND:
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35 BLENDRECT(Uint16, DRAW_SETPIXEL_BLEND_RGB555);
e40448bc7727 Share code between fill and line drawing
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36 break;
e40448bc7727 Share code between fill and line drawing
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37 case SDL_BLENDMODE_ADD:
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38 BLENDRECT(Uint16, DRAW_SETPIXEL_ADD_RGB555);
e40448bc7727 Share code between fill and line drawing
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39 break;
e40448bc7727 Share code between fill and line drawing
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40 case SDL_BLENDMODE_MOD:
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41 BLENDRECT(Uint16, DRAW_SETPIXEL_MOD_RGB555);
e40448bc7727 Share code between fill and line drawing
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42 break;
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43 default:
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44 BLENDRECT(Uint16, DRAW_SETPIXEL_RGB555);
e40448bc7727 Share code between fill and line drawing
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45 break;
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46 }
e40448bc7727 Share code between fill and line drawing
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47 return 0;
e40448bc7727 Share code between fill and line drawing
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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,
e40448bc7727 Share code between fill and line drawing
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52 Uint8 r, Uint8 g, Uint8 b, Uint8 a)
e40448bc7727 Share code between fill and line drawing
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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 BLENDRECT(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 BLENDRECT(Uint16, DRAW_SETPIXEL_ADD_RGB565);
e40448bc7727 Share code between fill and line drawing
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62 break;
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63 case SDL_BLENDMODE_MOD:
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64 BLENDRECT(Uint16, DRAW_SETPIXEL_MOD_RGB565);
e40448bc7727 Share code between fill and line drawing
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65 break;
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66 default:
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67 BLENDRECT(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,
e40448bc7727 Share code between fill and line drawing
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75 Uint8 r, Uint8 g, Uint8 b, Uint8 a)
e40448bc7727 Share code between fill and line drawing
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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 BLENDRECT(Uint32, DRAW_SETPIXEL_BLEND_RGB888);
e40448bc7727 Share code between fill and line drawing
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82 break;
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83 case SDL_BLENDMODE_ADD:
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84 BLENDRECT(Uint32, DRAW_SETPIXEL_ADD_RGB888);
e40448bc7727 Share code between fill and line drawing
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85 break;
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86 case SDL_BLENDMODE_MOD:
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87 BLENDRECT(Uint32, DRAW_SETPIXEL_MOD_RGB888);
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88 break;
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89 default:
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90 BLENDRECT(Uint32, DRAW_SETPIXEL_RGB888);
e40448bc7727 Share code between fill and line drawing
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91 break;
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92 }
e40448bc7727 Share code between fill and line drawing
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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_RGB(SDL_Surface * dst, SDL_Rect * dstrect, int blendMode,
e40448bc7727 Share code between fill and line drawing
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98 Uint8 r, Uint8 g, Uint8 b, Uint8 a)
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99 {
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100 SDL_PixelFormat *fmt = dst->format;
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101 unsigned inva = 0xff - a;
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102
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103 switch (fmt->BytesPerPixel) {
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104 case 2:
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105 switch (blendMode) {
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106 case SDL_BLENDMODE_BLEND:
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107 BLENDRECT(Uint16, DRAW_SETPIXEL_BLEND_RGB);
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108 break;
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109 case SDL_BLENDMODE_ADD:
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110 BLENDRECT(Uint16, DRAW_SETPIXEL_ADD_RGB);
e40448bc7727 Share code between fill and line drawing
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111 break;
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112 case SDL_BLENDMODE_MOD:
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113 BLENDRECT(Uint16, DRAW_SETPIXEL_MOD_RGB);
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114 break;
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115 default:
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116 BLENDRECT(Uint16, DRAW_SETPIXEL_RGB);
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117 break;
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118 }
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119 return 0;
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120 case 4:
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121 switch (blendMode) {
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122 case SDL_BLENDMODE_BLEND:
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123 BLENDRECT(Uint32, DRAW_SETPIXEL_BLEND_RGB);
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124 break;
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125 case SDL_BLENDMODE_ADD:
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126 BLENDRECT(Uint32, DRAW_SETPIXEL_ADD_RGB);
e40448bc7727 Share code between fill and line drawing
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127 break;
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128 case SDL_BLENDMODE_MOD:
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129 BLENDRECT(Uint32, DRAW_SETPIXEL_MOD_RGB);
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130 break;
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131 default:
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132 BLENDRECT(Uint32, DRAW_SETPIXEL_RGB);
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133 break;
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134 }
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135 return 0;
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136 default:
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137 SDL_Unsupported();
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138 return -1;
e40448bc7727 Share code between fill and line drawing
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139 }
e40448bc7727 Share code between fill and line drawing
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140 }
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141
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142 static int
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143 SDL_BlendRect_RGBA(SDL_Surface * dst, SDL_Rect * dstrect, int blendMode,
e40448bc7727 Share code between fill and line drawing
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144 Uint8 r, Uint8 g, Uint8 b, Uint8 a)
e40448bc7727 Share code between fill and line drawing
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145 {
e40448bc7727 Share code between fill and line drawing
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146 SDL_PixelFormat *fmt = dst->format;
e40448bc7727 Share code between fill and line drawing
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147 unsigned inva = 0xff - a;
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148
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149 switch (fmt->BytesPerPixel) {
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150 case 4:
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151 switch (blendMode) {
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152 case SDL_BLENDMODE_BLEND:
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153 BLENDRECT(Uint32, DRAW_SETPIXEL_BLEND_RGBA);
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154 break;
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155 case SDL_BLENDMODE_ADD:
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156 BLENDRECT(Uint32, DRAW_SETPIXEL_ADD_RGBA);
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157 break;
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158 case SDL_BLENDMODE_MOD:
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159 BLENDRECT(Uint32, DRAW_SETPIXEL_MOD_RGBA);
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160 break;
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161 default:
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162 BLENDRECT(Uint32, DRAW_SETPIXEL_RGBA);
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163 break;
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164 }
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165 return 0;
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166 default:
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167 SDL_Unsupported();
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168 return -1;
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169 }
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170 }
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171
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172 int
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173 SDL_BlendRect(SDL_Surface * dst, SDL_Rect * dstrect, int blendMode, Uint8 r,
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174 Uint8 g, Uint8 b, Uint8 a)
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175 {
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176 SDL_PixelFormat *fmt = dst->format;
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177
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178 /* This function doesn't work on surfaces < 8 bpp */
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179 if (fmt->BitsPerPixel < 8) {
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180 SDL_SetError("SDL_BlendRect(): Unsupported surface format");
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181 return (-1);
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182 }
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183
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184 /* If 'dstrect' == NULL, then fill the whole surface */
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185 if (dstrect) {
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186 /* Perform clipping */
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187 if (!SDL_IntersectRect(dstrect, &dst->clip_rect, dstrect)) {
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188 return (0);
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189 }
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190 } else {
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191 dstrect = &dst->clip_rect;
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192 }
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193
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194 if ((blendMode == SDL_BLENDMODE_BLEND)
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195 || (blendMode == SDL_BLENDMODE_ADD)) {
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196 r = DRAW_MUL(r, a);
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197 g = DRAW_MUL(g, a);
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198 b = DRAW_MUL(b, a);
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199 }
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200
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201 switch (fmt->BitsPerPixel) {
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202 case 15:
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203 switch (fmt->Rmask) {
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204 case 0x7C00:
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205 return SDL_BlendRect_RGB555(dst, dstrect, blendMode, r, g, b, a);
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206 }
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207 break;
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208 case 16:
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209 switch (fmt->Rmask) {
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210 case 0xF800:
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211 return SDL_BlendRect_RGB565(dst, dstrect, blendMode, r, g, b, a);
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212 }
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213 break;
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214 case 32:
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215 switch (fmt->Rmask) {
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216 case 0x00FF0000:
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217 if (!fmt->Amask) {
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218 return SDL_BlendRect_RGB888(dst, dstrect, blendMode, r, g, b,
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219 a);
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220 }
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221 break;
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222 }
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223 default:
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224 break;
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225 }
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226
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227 if (!fmt->Amask) {
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228 return SDL_BlendRect_RGB(dst, dstrect, blendMode, r, g, b, a);
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229 } else {
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230 return SDL_BlendRect_RGBA(dst, dstrect, blendMode, r, g, b, a);
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231 }
2888
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232 }
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233
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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234 /* vi: set ts=4 sw=4 expandtab: */