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annotate src/video/SDL_blit_slow.c @ 4590:1ad70fb49fcb

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Fix so many things that there is little place in this column to list them all but the result is that blending modes just work now for drawing primitives. Fixes involved: 1. Fix handling of alpha channel when SDL_BLENDMODE_NONE is set. 2. Make xrendercolor use floating-point values for color channels and then convert to 16 bit ints. 3. Fix handling of visuals in SDL_x11modes.c so that a 32 bit ARGB visual is used. 4. Fix the background pixel value in SDL_x11window.c so that the window background has an alpha value of 0xFF and not 0.
author Sunny Sachanandani <sunnysachanandani@gmail.com>
date Fri, 09 Jul 2010 21:36:41 +0530
parents f7b03b6838cb
children 791b3256fb22
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
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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
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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
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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
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27 /* The ONE TRUE BLITTER
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28 * This puppy has to handle all the unoptimized cases - yes, it's slow.
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29 */
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30 void
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31 SDL_Blit_Slow(SDL_BlitInfo * info)
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32 {
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33 const int flags = info->flags;
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34 const Uint32 modulateR = info->r;
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35 const Uint32 modulateG = info->g;
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36 const Uint32 modulateB = info->b;
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37 const Uint32 modulateA = info->a;
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38 Uint32 srcpixel;
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39 Uint32 srcR, srcG, srcB, srcA;
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40 Uint32 dstpixel;
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41 Uint32 dstR, dstG, dstB, dstA;
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42 int srcy, srcx;
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43 int posy, posx;
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44 int incy, incx;
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45 SDL_PixelFormat *src_fmt = info->src_fmt;
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46 SDL_PixelFormat *dst_fmt = info->dst_fmt;
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47 int srcbpp = src_fmt->BytesPerPixel;
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48 int dstbpp = dst_fmt->BytesPerPixel;
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49
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50 srcy = 0;
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51 posy = 0;
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52 incy = (info->src_h << 16) / info->dst_h;
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53 incx = (info->src_w << 16) / info->dst_w;
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54
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55 while (info->dst_h--) {
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56 Uint8 *src;
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57 Uint8 *dst = (Uint8 *) info->dst;
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58 int n = info->dst_w;
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59 srcx = -1;
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60 posx = 0x10000L;
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61 while (posy >= 0x10000L) {
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62 ++srcy;
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63 posy -= 0x10000L;
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64 }
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65 while (n--) {
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66 if (posx >= 0x10000L) {
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67 while (posx >= 0x10000L) {
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68 ++srcx;
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69 posx -= 0x10000L;
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70 }
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71 src =
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72 (info->src + (srcy * info->src_pitch) + (srcx * srcbpp));
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73 }
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74 if (src_fmt->Amask) {
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75 DISEMBLE_RGBA(src, srcbpp, src_fmt, srcpixel, srcR, srcG,
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76 srcB, srcA);
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77 } else {
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78 DISEMBLE_RGB(src, srcbpp, src_fmt, srcpixel, srcR, srcG,
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79 srcB);
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80 srcA = 0xFF;
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81 }
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82 if (flags & SDL_COPY_COLORKEY) {
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83 /* srcpixel isn't set for 24 bpp */
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84 if (srcbpp == 3) {
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85 srcpixel = (srcR << src_fmt->Rshift) |
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86 (srcG << src_fmt->Gshift) | (srcB << src_fmt->Bshift);
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87 }
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88 if (srcpixel == info->colorkey) {
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89 posx += incx;
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90 dst += dstbpp;
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91 continue;
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92 }
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93 }
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94 if (dst_fmt->Amask) {
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95 DISEMBLE_RGBA(dst, dstbpp, dst_fmt, dstpixel, dstR, dstG,
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96 dstB, dstA);
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97 } else {
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98 DISEMBLE_RGB(dst, dstbpp, dst_fmt, dstpixel, dstR, dstG,
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99 dstB);
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100 dstA = 0xFF;
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101 }
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102
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103 if (flags & SDL_COPY_MODULATE_COLOR) {
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104 srcR = (srcR * modulateR) / 255;
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105 srcG = (srcG * modulateG) / 255;
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106 srcB = (srcB * modulateB) / 255;
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107 }
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108 if (flags & SDL_COPY_MODULATE_ALPHA) {
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109 srcA = (srcA * modulateA) / 255;
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110 }
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111 if (flags & (SDL_COPY_BLEND | SDL_COPY_ADD)) {
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112 /* This goes away if we ever use premultiplied alpha */
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113 if (srcA < 255) {
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114 srcR = (srcR * srcA) / 255;
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115 srcG = (srcG * srcA) / 255;
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116 srcB = (srcB * srcA) / 255;
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117 }
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118 }
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119 switch (flags &
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120 (SDL_COPY_MASK | SDL_COPY_BLEND | SDL_COPY_ADD |
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121 SDL_COPY_MOD)) {
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122 case 0:
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123 dstR = srcR;
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124 dstG = srcG;
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125 dstB = srcB;
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126 dstA = srcA;
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127 break;
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128 case SDL_COPY_MASK:
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129 if (srcA) {
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130 dstR = srcR;
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131 dstG = srcG;
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132 dstB = srcB;
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133 }
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134 break;
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135 case SDL_COPY_BLEND:
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136 dstR = srcR + ((255 - srcA) * dstR) / 255;
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137 dstG = srcG + ((255 - srcA) * dstG) / 255;
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138 dstB = srcB + ((255 - srcA) * dstB) / 255;
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139 break;
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140 case SDL_COPY_ADD:
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141 dstR = srcR + dstR;
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142 if (dstR > 255)
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143 dstR = 255;
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144 dstG = srcG + dstG;
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145 if (dstG > 255)
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146 dstG = 255;
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147 dstB = srcB + dstB;
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148 if (dstB > 255)
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149 dstB = 255;
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150 break;
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151 case SDL_COPY_MOD:
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152 dstR = (srcR * dstR) / 255;
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153 dstG = (srcG * dstG) / 255;
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154 dstB = (srcB * dstB) / 255;
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155 break;
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156 }
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157 if (dst_fmt->Amask) {
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158 ASSEMBLE_RGBA(dst, dstbpp, dst_fmt, dstR, dstG, dstB, dstA);
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159 } else {
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160 ASSEMBLE_RGB(dst, dstbpp, dst_fmt, dstR, dstG, dstB);
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161 }
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162 posx += incx;
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163 dst += dstbpp;
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164 }
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165 posy += incy;
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166 info->dst += info->dst_pitch;
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167 }
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168 }
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e893d24ad8db Getting ready to add slow blitters. Everyone will love me. :)
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169
e893d24ad8db Getting ready to add slow blitters. Everyone will love me. :)
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170 /* vi: set ts=4 sw=4 expandtab: */