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annotate src/video/SDL_blit_slow.c @ 4504:9faebccfefb3

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Amazingly the Windows code is almost identical to the Mac OS X code. :)
author Sam Lantinga <slouken@libsdl.org>
date Thu, 08 Jul 2010 23:07:34 -0700
parents 791b3256fb22
children e743b9c3f6d6
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2010 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Lesser General Public
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7 License as published by the Free Software Foundation; either
e893d24ad8db Getting ready to add slow blitters. Everyone will love me. :)
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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
e893d24ad8db Getting ready to add slow blitters. Everyone will love me. :)
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
e893d24ad8db Getting ready to add slow blitters. Everyone will love me. :)
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13 Lesser General Public License for more details.
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14
e893d24ad8db Getting ready to add slow blitters. Everyone will love me. :)
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15 You should have received a copy of the GNU Lesser General Public
e893d24ad8db Getting ready to add slow blitters. Everyone will love me. :)
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16 License along with this library; if not, write to the Free Software
e893d24ad8db Getting ready to add slow blitters. Everyone will love me. :)
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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_blit.h"
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26 #include "SDL_blit_slow.h"
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27
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28 /* The ONE TRUE BLITTER
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29 * This puppy has to handle all the unoptimized cases - yes, it's slow.
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30 */
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31 void
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32 SDL_Blit_Slow(SDL_BlitInfo * info)
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33 {
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34 const int flags = info->flags;
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35 const Uint32 modulateR = info->r;
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36 const Uint32 modulateG = info->g;
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37 const Uint32 modulateB = info->b;
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38 const Uint32 modulateA = info->a;
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39 Uint32 srcpixel;
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40 Uint32 srcR, srcG, srcB, srcA;
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41 Uint32 dstpixel;
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42 Uint32 dstR, dstG, dstB, dstA;
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43 int srcy, srcx;
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44 int posy, posx;
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45 int incy, incx;
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46 SDL_PixelFormat *src_fmt = info->src_fmt;
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47 SDL_PixelFormat *dst_fmt = info->dst_fmt;
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48 int srcbpp = src_fmt->BytesPerPixel;
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49 int dstbpp = dst_fmt->BytesPerPixel;
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50
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51 srcy = 0;
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52 posy = 0;
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53 incy = (info->src_h << 16) / info->dst_h;
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54 incx = (info->src_w << 16) / info->dst_w;
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55
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56 while (info->dst_h--) {
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57 Uint8 *src;
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58 Uint8 *dst = (Uint8 *) info->dst;
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59 int n = info->dst_w;
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60 srcx = -1;
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61 posx = 0x10000L;
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62 while (posy >= 0x10000L) {
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63 ++srcy;
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64 posy -= 0x10000L;
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65 }
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66 while (n--) {
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67 if (posx >= 0x10000L) {
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68 while (posx >= 0x10000L) {
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69 ++srcx;
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70 posx -= 0x10000L;
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71 }
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72 src =
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73 (info->src + (srcy * info->src_pitch) + (srcx * srcbpp));
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74 }
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75 if (src_fmt->Amask) {
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76 DISEMBLE_RGBA(src, srcbpp, src_fmt, srcpixel, srcR, srcG,
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77 srcB, srcA);
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78 } else {
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79 DISEMBLE_RGB(src, srcbpp, src_fmt, srcpixel, srcR, srcG,
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80 srcB);
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81 srcA = 0xFF;
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82 }
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83 if (flags & SDL_COPY_COLORKEY) {
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84 /* srcpixel isn't set for 24 bpp */
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85 if (srcbpp == 3) {
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86 srcpixel = (srcR << src_fmt->Rshift) |
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87 (srcG << src_fmt->Gshift) | (srcB << src_fmt->Bshift);
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88 }
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89 if (srcpixel == info->colorkey) {
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90 posx += incx;
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91 dst += dstbpp;
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92 continue;
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93 }
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94 }
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95 if (dst_fmt->Amask) {
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96 DISEMBLE_RGBA(dst, dstbpp, dst_fmt, dstpixel, dstR, dstG,
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97 dstB, dstA);
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98 } else {
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99 DISEMBLE_RGB(dst, dstbpp, dst_fmt, dstpixel, dstR, dstG,
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100 dstB);
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101 dstA = 0xFF;
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102 }
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103
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104 if (flags & SDL_COPY_MODULATE_COLOR) {
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105 srcR = (srcR * modulateR) / 255;
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106 srcG = (srcG * modulateG) / 255;
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107 srcB = (srcB * modulateB) / 255;
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108 }
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109 if (flags & SDL_COPY_MODULATE_ALPHA) {
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110 srcA = (srcA * modulateA) / 255;
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111 }
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112 if (flags & (SDL_COPY_BLEND | SDL_COPY_ADD)) {
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113 /* This goes away if we ever use premultiplied alpha */
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114 if (srcA < 255) {
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115 srcR = (srcR * srcA) / 255;
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116 srcG = (srcG * srcA) / 255;
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117 srcB = (srcB * srcA) / 255;
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118 }
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119 }
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120 switch (flags &
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121 (SDL_COPY_MASK | SDL_COPY_BLEND | SDL_COPY_ADD |
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122 SDL_COPY_MOD)) {
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123 case 0:
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124 dstR = srcR;
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125 dstG = srcG;
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126 dstB = srcB;
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127 dstA = srcA;
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128 break;
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129 case SDL_COPY_MASK:
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130 if (srcA) {
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131 dstR = srcR;
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132 dstG = srcG;
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133 dstB = srcB;
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134 }
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135 break;
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136 case SDL_COPY_BLEND:
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137 dstR = srcR + ((255 - srcA) * dstR) / 255;
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138 dstG = srcG + ((255 - srcA) * dstG) / 255;
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139 dstB = srcB + ((255 - srcA) * dstB) / 255;
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140 break;
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141 case SDL_COPY_ADD:
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142 dstR = srcR + dstR;
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143 if (dstR > 255)
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144 dstR = 255;
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145 dstG = srcG + dstG;
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146 if (dstG > 255)
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147 dstG = 255;
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148 dstB = srcB + dstB;
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149 if (dstB > 255)
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150 dstB = 255;
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151 break;
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152 case SDL_COPY_MOD:
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153 dstR = (srcR * dstR) / 255;
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154 dstG = (srcG * dstG) / 255;
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155 dstB = (srcB * dstB) / 255;
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156 break;
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157 }
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158 if (dst_fmt->Amask) {
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159 ASSEMBLE_RGBA(dst, dstbpp, dst_fmt, dstR, dstG, dstB, dstA);
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160 } else {
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161 ASSEMBLE_RGB(dst, dstbpp, dst_fmt, dstR, dstG, dstB);
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162 }
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163 posx += incx;
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164 dst += dstbpp;
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165 }
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166 posy += incy;
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167 info->dst += info->dst_pitch;
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168 }
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169 }
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e893d24ad8db Getting ready to add slow blitters. Everyone will love me. :)
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170
e893d24ad8db Getting ready to add slow blitters. Everyone will love me. :)
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171 /* vi: set ts=4 sw=4 expandtab: */