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annotate src/video/SDL_blendrect.c @ 3294:470d0a416aa7

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Fixed bug #714 fuzzyTew@gmail.com 2009-03-14 15:18:45 PDT patch to change HAVE_ICONV to HAVE_ICONV_H There are two separate iconv checks in configure -- one for the header file and one for the library. include/SDL_stdinc.h uses the library define to see whether or not it should reference the types defined in the header, which naturally breaks if the library exists and the header does not.
author Sam Lantinga <slouken@libsdl.org>
date Mon, 21 Sep 2009 11:04:01 +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
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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
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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
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141 }
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142 return 0;
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diff changeset
143 case 4:
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diff changeset
144 switch (blendMode) {
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145 case SDL_BLENDMODE_BLEND:
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146 FILLRECT(Uint32, DRAW_SETPIXEL_BLEND_RGB);
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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);
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150 break;
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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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154 default:
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155 FILLRECT(Uint32, DRAW_SETPIXEL_RGB);
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156 break;
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parents: 2896
diff changeset
157 }
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158 return 0;
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159 default:
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160 SDL_Unsupported();
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161 return -1;
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parents: 2896
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162 }
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parents: 2896
diff changeset
163 }
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164
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165 static int
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166 SDL_BlendRect_RGBA(SDL_Surface * dst, SDL_Rect * dstrect, int blendMode,
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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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diff changeset
172 switch (fmt->BytesPerPixel) {
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173 case 4:
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174 switch (blendMode) {
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175 case SDL_BLENDMODE_BLEND:
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176 FILLRECT(Uint32, DRAW_SETPIXEL_BLEND_RGBA);
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177 break;
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178 case SDL_BLENDMODE_ADD:
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179 FILLRECT(Uint32, DRAW_SETPIXEL_ADD_RGBA);
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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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183 break;
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184 default:
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185 FILLRECT(Uint32, DRAW_SETPIXEL_RGBA);
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186 break;
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187 }
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188 return 0;
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diff changeset
189 default:
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diff changeset
190 SDL_Unsupported();
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191 return -1;
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diff changeset
192 }
e40448bc7727 Share code between fill and line drawing
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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
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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 {
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diff changeset
199 SDL_PixelFormat *fmt = dst->format;
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diff changeset
200
2888
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parents:
diff changeset
201 /* This function doesn't work on surfaces < 8 bpp */
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diff changeset
202 if (fmt->BitsPerPixel < 8) {
2888
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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
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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
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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
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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
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1ef2f1e75ff7 Date: Sat, 20 Dec 2008 23:25:19 +0100
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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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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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diff changeset
221 b = DRAW_MUL(b, a);
2896
1ef2f1e75ff7 Date: Sat, 20 Dec 2008 23:25:19 +0100
Sam Lantinga <slouken@libsdl.org>
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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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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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diff changeset
226 switch (fmt->Rmask) {
e40448bc7727 Share code between fill and line drawing
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diff changeset
227 case 0x7C00:
e40448bc7727 Share code between fill and line drawing
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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
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parents: 2896
diff changeset
232 switch (fmt->Rmask) {
e40448bc7727 Share code between fill and line drawing
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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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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
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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
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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
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parents: 2896
diff changeset
254 return SDL_BlendRect_RGB(dst, dstrect, blendMode, r, g, b, a);
e40448bc7727 Share code between fill and line drawing
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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: */