annotate src/video/SDL_blit_A.c @ 252:e8157fcb3114

Updated the source with the correct e-mail address
author Sam Lantinga <slouken@libsdl.org>
date Fri, 14 Dec 2001 12:38:15 +0000
parents cf2af46e9e2a
children f6ffac90895c
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, 1998, 1999, 2000, 2001 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 Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 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
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13 Library 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 Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18
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19 Sam Lantinga
252
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20 slouken@libsdl.org
0
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21 */
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22
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23 #ifdef SAVE_RCSID
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24 static char rcsid =
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25 "@(#) $Id$";
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26 #endif
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27
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28 #include <stdio.h>
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29
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30 #include "SDL_types.h"
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31 #include "SDL_video.h"
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32 #include "SDL_blit.h"
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33
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34 /* Functions to perform alpha blended blitting */
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35
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36 /* N->1 blending with per-surface alpha */
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37 static void BlitNto1SurfaceAlpha(SDL_BlitInfo *info)
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38 {
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39 int width = info->d_width;
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40 int height = info->d_height;
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41 Uint8 *src = info->s_pixels;
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42 int srcskip = info->s_skip;
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43 Uint8 *dst = info->d_pixels;
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44 int dstskip = info->d_skip;
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45 Uint8 *palmap = info->table;
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46 SDL_PixelFormat *srcfmt = info->src;
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47 SDL_PixelFormat *dstfmt = info->dst;
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48 int srcbpp = srcfmt->BytesPerPixel;
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49
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50 const unsigned A = srcfmt->alpha;
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51
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52 while ( height-- ) {
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53 DUFFS_LOOP4(
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54 {
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55 Uint32 pixel;
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56 unsigned sR;
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57 unsigned sG;
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58 unsigned sB;
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59 unsigned dR;
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60 unsigned dG;
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61 unsigned dB;
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62 DISEMBLE_RGB(src, srcbpp, srcfmt, pixel, sR, sG, sB);
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63 dR = dstfmt->palette->colors[*dst].r;
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64 dG = dstfmt->palette->colors[*dst].g;
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65 dB = dstfmt->palette->colors[*dst].b;
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66 ALPHA_BLEND(sR, sG, sB, A, dR, dG, dB);
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67 dR &= 0xff;
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68 dG &= 0xff;
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69 dB &= 0xff;
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70 /* Pack RGB into 8bit pixel */
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71 if ( palmap == NULL ) {
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72 *dst =((dR>>5)<<(3+2))|
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73 ((dG>>5)<<(2))|
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74 ((dB>>6)<<(0));
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75 } else {
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76 *dst = palmap[((dR>>5)<<(3+2))|
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77 ((dG>>5)<<(2)) |
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78 ((dB>>6)<<(0))];
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79 }
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80 dst++;
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81 src += srcbpp;
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82 },
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83 width);
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84 src += srcskip;
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85 dst += dstskip;
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86 }
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87 }
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88
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89 /* N->1 blending with pixel alpha */
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90 static void BlitNto1PixelAlpha(SDL_BlitInfo *info)
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91 {
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92 int width = info->d_width;
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93 int height = info->d_height;
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94 Uint8 *src = info->s_pixels;
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95 int srcskip = info->s_skip;
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96 Uint8 *dst = info->d_pixels;
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97 int dstskip = info->d_skip;
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98 Uint8 *palmap = info->table;
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99 SDL_PixelFormat *srcfmt = info->src;
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100 SDL_PixelFormat *dstfmt = info->dst;
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101 int srcbpp = srcfmt->BytesPerPixel;
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102
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103 /* FIXME: fix alpha bit field expansion here too? */
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104 while ( height-- ) {
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105 DUFFS_LOOP4(
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106 {
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107 Uint32 pixel;
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108 unsigned sR;
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109 unsigned sG;
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110 unsigned sB;
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111 unsigned sA;
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112 unsigned dR;
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113 unsigned dG;
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114 unsigned dB;
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115 DISEMBLE_RGBA(src,srcbpp,srcfmt,pixel,sR,sG,sB,sA);
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116 dR = dstfmt->palette->colors[*dst].r;
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117 dG = dstfmt->palette->colors[*dst].g;
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118 dB = dstfmt->palette->colors[*dst].b;
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119 ALPHA_BLEND(sR, sG, sB, sA, dR, dG, dB);
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120 dR &= 0xff;
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121 dG &= 0xff;
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122 dB &= 0xff;
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123 /* Pack RGB into 8bit pixel */
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124 if ( palmap == NULL ) {
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125 *dst =((dR>>5)<<(3+2))|
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126 ((dG>>5)<<(2))|
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127 ((dB>>6)<<(0));
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128 } else {
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129 *dst = palmap[((dR>>5)<<(3+2))|
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130 ((dG>>5)<<(2)) |
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131 ((dB>>6)<<(0)) ];
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132 }
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133 dst++;
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134 src += srcbpp;
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135 },
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136 width);
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137 src += srcskip;
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138 dst += dstskip;
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139 }
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140 }
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141
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142 /* colorkeyed N->1 blending with per-surface alpha */
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143 static void BlitNto1SurfaceAlphaKey(SDL_BlitInfo *info)
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144 {
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145 int width = info->d_width;
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146 int height = info->d_height;
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147 Uint8 *src = info->s_pixels;
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148 int srcskip = info->s_skip;
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149 Uint8 *dst = info->d_pixels;
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150 int dstskip = info->d_skip;
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151 Uint8 *palmap = info->table;
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152 SDL_PixelFormat *srcfmt = info->src;
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153 SDL_PixelFormat *dstfmt = info->dst;
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154 int srcbpp = srcfmt->BytesPerPixel;
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155 Uint32 ckey = srcfmt->colorkey;
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156
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157 const int A = srcfmt->alpha;
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158
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159 while ( height-- ) {
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160 DUFFS_LOOP(
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161 {
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162 Uint32 pixel;
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163 unsigned sR;
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164 unsigned sG;
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165 unsigned sB;
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166 unsigned dR;
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167 unsigned dG;
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168 unsigned dB;
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169 DISEMBLE_RGB(src, srcbpp, srcfmt, pixel, sR, sG, sB);
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170 if ( pixel != ckey ) {
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171 dR = dstfmt->palette->colors[*dst].r;
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172 dG = dstfmt->palette->colors[*dst].g;
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173 dB = dstfmt->palette->colors[*dst].b;
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174 ALPHA_BLEND(sR, sG, sB, A, dR, dG, dB);
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175 dR &= 0xff;
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176 dG &= 0xff;
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177 dB &= 0xff;
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178 /* Pack RGB into 8bit pixel */
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179 if ( palmap == NULL ) {
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180 *dst =((dR>>5)<<(3+2))|
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181 ((dG>>5)<<(2)) |
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182 ((dB>>6)<<(0));
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183 } else {
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184 *dst = palmap[((dR>>5)<<(3+2))|
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185 ((dG>>5)<<(2)) |
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186 ((dB>>6)<<(0)) ];
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187 }
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188 }
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189 dst++;
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190 src += srcbpp;
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191 },
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192 width);
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193 src += srcskip;
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194 dst += dstskip;
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195 }
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196 }
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197
1
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198 /* fast RGB888->(A)RGB888 blending with surface alpha=128 special case */
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199 static void BlitRGBtoRGBSurfaceAlpha128(SDL_BlitInfo *info)
0
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200 {
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201 int width = info->d_width;
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202 int height = info->d_height;
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203 Uint32 *srcp = (Uint32 *)info->s_pixels;
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204 int srcskip = info->s_skip >> 2;
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205 Uint32 *dstp = (Uint32 *)info->d_pixels;
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206 int dstskip = info->d_skip >> 2;
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207
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208 while(height--) {
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209 DUFFS_LOOP4({
1
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210 Uint32 s = *srcp++;
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211 Uint32 d = *dstp;
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212 *dstp++ = ((((s & 0x00fefefe) + (d & 0x00fefefe)) >> 1)
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213 + (s & d & 0x00010101)) | 0xff000000;
0
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214 }, width);
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215 srcp += srcskip;
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216 dstp += dstskip;
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217 }
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218 }
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219
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220 /* fast RGB888->(A)RGB888 blending with surface alpha */
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221 static void BlitRGBtoRGBSurfaceAlpha(SDL_BlitInfo *info)
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222 {
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223 unsigned alpha = info->src->alpha;
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224 if(alpha == 128) {
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225 BlitRGBtoRGBSurfaceAlpha128(info);
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226 } else {
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227 int width = info->d_width;
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228 int height = info->d_height;
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229 Uint32 *srcp = (Uint32 *)info->s_pixels;
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230 int srcskip = info->s_skip >> 2;
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231 Uint32 *dstp = (Uint32 *)info->d_pixels;
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232 int dstskip = info->d_skip >> 2;
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233
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234 while(height--) {
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235 DUFFS_LOOP4({
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236 Uint32 s;
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237 Uint32 d;
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238 Uint32 s1;
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239 Uint32 d1;
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240 s = *srcp;
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241 d = *dstp;
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242 s1 = s & 0xff00ff;
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243 d1 = d & 0xff00ff;
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244 d1 = (d1 + ((s1 - d1) * alpha >> 8))
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245 & 0xff00ff;
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246 s &= 0xff00;
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247 d &= 0xff00;
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248 d = (d + ((s - d) * alpha >> 8)) & 0xff00;
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249 *dstp = d1 | d | 0xff000000;
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250 ++srcp;
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251 ++dstp;
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252 }, width);
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253 srcp += srcskip;
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254 dstp += dstskip;
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255 }
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256 }
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257 }
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258
0
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259 /* fast ARGB888->(A)RGB888 blending with pixel alpha */
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260 static void BlitRGBtoRGBPixelAlpha(SDL_BlitInfo *info)
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261 {
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262 int width = info->d_width;
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263 int height = info->d_height;
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264 Uint32 *srcp = (Uint32 *)info->s_pixels;
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265 int srcskip = info->s_skip >> 2;
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266 Uint32 *dstp = (Uint32 *)info->d_pixels;
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267 int dstskip = info->d_skip >> 2;
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268
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269 while(height--) {
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270 DUFFS_LOOP4({
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271 Uint32 dalpha;
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272 Uint32 d;
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273 Uint32 s1;
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274 Uint32 d1;
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275 Uint32 s = *srcp;
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276 Uint32 alpha = s >> 24;
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277 /* FIXME: Here we special-case opaque alpha since the
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278 compositioning used (>>8 instead of /255) doesn't handle
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279 it correctly. Also special-case alpha=0 for speed?
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280 Benchmark this! */
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281 if(alpha == SDL_ALPHA_OPAQUE) {
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282 *dstp = (s & 0x00ffffff) | (*dstp & 0xff000000);
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283 } else {
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284 /*
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285 * take out the middle component (green), and process
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286 * the other two in parallel. One multiply less.
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287 */
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288 d = *dstp;
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289 dalpha = d & 0xff000000;
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290 s1 = s & 0xff00ff;
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291 d1 = d & 0xff00ff;
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292 d1 = (d1 + ((s1 - d1) * alpha >> 8)) & 0xff00ff;
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293 s &= 0xff00;
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294 d &= 0xff00;
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295 d = (d + ((s - d) * alpha >> 8)) & 0xff00;
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296 *dstp = d1 | d | dalpha;
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297 }
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298 ++srcp;
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299 ++dstp;
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300 }, width);
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301 srcp += srcskip;
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302 dstp += dstskip;
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303 }
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304 }
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305
1
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306 /* 16bpp special case for per-surface alpha=50%: blend 2 pixels in parallel */
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307
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308 /* blend a single 16 bit pixel at 50% */
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309 #define BLEND16_50(d, s, mask) \
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310 ((((s & mask) + (d & mask)) >> 1) + (s & d & (~mask & 0xffff)))
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311
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312 /* blend two 16 bit pixels at 50% */
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313 #define BLEND2x16_50(d, s, mask) \
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314 (((s & (mask | mask << 16)) >> 1) + ((d & (mask | mask << 16)) >> 1) \
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315 + (s & d & (~(mask | mask << 16))))
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316
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317 static void Blit16to16SurfaceAlpha128(SDL_BlitInfo *info, Uint16 mask)
0
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318 {
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319 int width = info->d_width;
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320 int height = info->d_height;
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321 Uint16 *srcp = (Uint16 *)info->s_pixels;
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322 int srcskip = info->s_skip >> 1;
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diff changeset
323 Uint16 *dstp = (Uint16 *)info->d_pixels;
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diff changeset
324 int dstskip = info->d_skip >> 1;
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diff changeset
325
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diff changeset
326 while(height--) {
1
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diff changeset
327 if(((unsigned long)srcp ^ (unsigned long)dstp) & 2) {
cf2af46e9e2a Changes since SDL 1.2.0 release
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328 /*
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329 * Source and destination not aligned, pipeline it.
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330 * This is mostly a win for big blits but no loss for
cf2af46e9e2a Changes since SDL 1.2.0 release
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331 * small ones
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332 */
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333 Uint32 prev_sw;
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334 int w = width;
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335
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336 /* handle odd destination */
cf2af46e9e2a Changes since SDL 1.2.0 release
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337 if((unsigned long)dstp & 2) {
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338 Uint16 d = *dstp, s = *srcp;
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339 *dstp = BLEND16_50(d, s, mask);
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340 dstp++;
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341 srcp++;
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342 w--;
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343 }
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344 srcp++; /* srcp is now 32-bit aligned */
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345
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346 /* bootstrap pipeline with first halfword */
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347 prev_sw = ((Uint32 *)srcp)[-1];
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348
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349 while(w > 1) {
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350 Uint32 sw, dw, s;
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351 sw = *(Uint32 *)srcp;
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352 dw = *(Uint32 *)dstp;
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353 if(SDL_BYTEORDER == SDL_BIG_ENDIAN)
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354 s = (prev_sw << 16) + (sw >> 16);
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355 else
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356 s = (prev_sw >> 16) + (sw << 16);
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357 prev_sw = sw;
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358 *(Uint32 *)dstp = BLEND2x16_50(dw, s, mask);
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359 dstp += 2;
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360 srcp += 2;
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361 w -= 2;
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362 }
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363
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364 /* final pixel if any */
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365 if(w) {
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366 Uint16 d = *dstp, s;
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367 if(SDL_BYTEORDER == SDL_BIG_ENDIAN)
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368 s = prev_sw;
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369 else
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370 s = prev_sw >> 16;
cf2af46e9e2a Changes since SDL 1.2.0 release
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diff changeset
371 *dstp = BLEND16_50(d, s, mask);
cf2af46e9e2a Changes since SDL 1.2.0 release
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372 srcp++;
cf2af46e9e2a Changes since SDL 1.2.0 release
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373 dstp++;
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diff changeset
374 }
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375 srcp += srcskip - 1;
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diff changeset
376 dstp += dstskip;
cf2af46e9e2a Changes since SDL 1.2.0 release
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diff changeset
377 } else {
cf2af46e9e2a Changes since SDL 1.2.0 release
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378 /* source and destination are aligned */
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379 int w = width;
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diff changeset
380
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diff changeset
381 /* first odd pixel? */
cf2af46e9e2a Changes since SDL 1.2.0 release
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diff changeset
382 if((unsigned long)srcp & 2) {
cf2af46e9e2a Changes since SDL 1.2.0 release
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diff changeset
383 Uint16 d = *dstp, s = *srcp;
cf2af46e9e2a Changes since SDL 1.2.0 release
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diff changeset
384 *dstp = BLEND16_50(d, s, mask);
cf2af46e9e2a Changes since SDL 1.2.0 release
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diff changeset
385 srcp++;
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diff changeset
386 dstp++;
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387 w--;
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388 }
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diff changeset
389 /* srcp and dstp are now 32-bit aligned */
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diff changeset
390
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diff changeset
391 while(w > 1) {
cf2af46e9e2a Changes since SDL 1.2.0 release
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diff changeset
392 Uint32 sw = *(Uint32 *)srcp;
cf2af46e9e2a Changes since SDL 1.2.0 release
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diff changeset
393 Uint32 dw = *(Uint32 *)dstp;
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diff changeset
394 *(Uint32 *)dstp = BLEND2x16_50(dw, sw, mask);
cf2af46e9e2a Changes since SDL 1.2.0 release
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diff changeset
395 srcp += 2;
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396 dstp += 2;
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397 w -= 2;
cf2af46e9e2a Changes since SDL 1.2.0 release
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398 }
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diff changeset
399
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diff changeset
400 /* last odd pixel? */
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diff changeset
401 if(w) {
cf2af46e9e2a Changes since SDL 1.2.0 release
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diff changeset
402 Uint16 d = *dstp, s = *srcp;
cf2af46e9e2a Changes since SDL 1.2.0 release
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diff changeset
403 *dstp = BLEND16_50(d, s, mask);
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diff changeset
404 srcp++;
cf2af46e9e2a Changes since SDL 1.2.0 release
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diff changeset
405 dstp++;
cf2af46e9e2a Changes since SDL 1.2.0 release
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diff changeset
406 }
cf2af46e9e2a Changes since SDL 1.2.0 release
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diff changeset
407 srcp += srcskip;
cf2af46e9e2a Changes since SDL 1.2.0 release
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diff changeset
408 dstp += dstskip;
cf2af46e9e2a Changes since SDL 1.2.0 release
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diff changeset
409 }
cf2af46e9e2a Changes since SDL 1.2.0 release
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diff changeset
410 }
cf2af46e9e2a Changes since SDL 1.2.0 release
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diff changeset
411 }
cf2af46e9e2a Changes since SDL 1.2.0 release
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diff changeset
412
cf2af46e9e2a Changes since SDL 1.2.0 release
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diff changeset
413 /* fast RGB565->RGB565 blending with surface alpha */
cf2af46e9e2a Changes since SDL 1.2.0 release
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diff changeset
414 static void Blit565to565SurfaceAlpha(SDL_BlitInfo *info)
cf2af46e9e2a Changes since SDL 1.2.0 release
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diff changeset
415 {
cf2af46e9e2a Changes since SDL 1.2.0 release
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416 unsigned alpha = info->src->alpha;
cf2af46e9e2a Changes since SDL 1.2.0 release
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diff changeset
417 if(alpha == 128) {
cf2af46e9e2a Changes since SDL 1.2.0 release
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diff changeset
418 Blit16to16SurfaceAlpha128(info, 0xf7de);
cf2af46e9e2a Changes since SDL 1.2.0 release
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diff changeset
419 } else {
cf2af46e9e2a Changes since SDL 1.2.0 release
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420 int width = info->d_width;
cf2af46e9e2a Changes since SDL 1.2.0 release
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diff changeset
421 int height = info->d_height;
cf2af46e9e2a Changes since SDL 1.2.0 release
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diff changeset
422 Uint16 *srcp = (Uint16 *)info->s_pixels;
cf2af46e9e2a Changes since SDL 1.2.0 release
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diff changeset
423 int srcskip = info->s_skip >> 1;
cf2af46e9e2a Changes since SDL 1.2.0 release
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diff changeset
424 Uint16 *dstp = (Uint16 *)info->d_pixels;
cf2af46e9e2a Changes since SDL 1.2.0 release
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diff changeset
425 int dstskip = info->d_skip >> 1;
cf2af46e9e2a Changes since SDL 1.2.0 release
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diff changeset
426 alpha >>= 3; /* downscale alpha to 5 bits */
cf2af46e9e2a Changes since SDL 1.2.0 release
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diff changeset
427
cf2af46e9e2a Changes since SDL 1.2.0 release
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diff changeset
428 while(height--) {
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diff changeset
429 DUFFS_LOOP4({
cf2af46e9e2a Changes since SDL 1.2.0 release
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diff changeset
430 Uint32 s = *srcp++;
cf2af46e9e2a Changes since SDL 1.2.0 release
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diff changeset
431 Uint32 d = *dstp;
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diff changeset
432 /*
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diff changeset
433 * shift out the middle component (green) to
cf2af46e9e2a Changes since SDL 1.2.0 release
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diff changeset
434 * the high 16 bits, and process all three RGB
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diff changeset
435 * components at the same time.
cf2af46e9e2a Changes since SDL 1.2.0 release
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diff changeset
436 */
cf2af46e9e2a Changes since SDL 1.2.0 release
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diff changeset
437 s = (s | s << 16) & 0x07e0f81f;
cf2af46e9e2a Changes since SDL 1.2.0 release
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diff changeset
438 d = (d | d << 16) & 0x07e0f81f;
cf2af46e9e2a Changes since SDL 1.2.0 release
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parents: 0
diff changeset
439 d += (s - d) * alpha >> 5;
cf2af46e9e2a Changes since SDL 1.2.0 release
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diff changeset
440 d &= 0x07e0f81f;
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diff changeset
441 *dstp++ = d | d >> 16;
cf2af46e9e2a Changes since SDL 1.2.0 release
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diff changeset
442 }, width);
cf2af46e9e2a Changes since SDL 1.2.0 release
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diff changeset
443 srcp += srcskip;
cf2af46e9e2a Changes since SDL 1.2.0 release
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diff changeset
444 dstp += dstskip;
cf2af46e9e2a Changes since SDL 1.2.0 release
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diff changeset
445 }
0
74212992fb08 Initial revision
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parents:
diff changeset
446 }
74212992fb08 Initial revision
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diff changeset
447 }
74212992fb08 Initial revision
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parents:
diff changeset
448
74212992fb08 Initial revision
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parents:
diff changeset
449 /* fast RGB555->RGB555 blending with surface alpha */
74212992fb08 Initial revision
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parents:
diff changeset
450 static void Blit555to555SurfaceAlpha(SDL_BlitInfo *info)
74212992fb08 Initial revision
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diff changeset
451 {
1
cf2af46e9e2a Changes since SDL 1.2.0 release
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diff changeset
452 unsigned alpha = info->src->alpha; /* downscale alpha to 5 bits */
cf2af46e9e2a Changes since SDL 1.2.0 release
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diff changeset
453 if(alpha == 128) {
cf2af46e9e2a Changes since SDL 1.2.0 release
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diff changeset
454 Blit16to16SurfaceAlpha128(info, 0xfbde);
cf2af46e9e2a Changes since SDL 1.2.0 release
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diff changeset
455 } else {
cf2af46e9e2a Changes since SDL 1.2.0 release
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diff changeset
456 int width = info->d_width;
cf2af46e9e2a Changes since SDL 1.2.0 release
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diff changeset
457 int height = info->d_height;
cf2af46e9e2a Changes since SDL 1.2.0 release
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diff changeset
458 Uint16 *srcp = (Uint16 *)info->s_pixels;
cf2af46e9e2a Changes since SDL 1.2.0 release
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diff changeset
459 int srcskip = info->s_skip >> 1;
cf2af46e9e2a Changes since SDL 1.2.0 release
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diff changeset
460 Uint16 *dstp = (Uint16 *)info->d_pixels;
cf2af46e9e2a Changes since SDL 1.2.0 release
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diff changeset
461 int dstskip = info->d_skip >> 1;
cf2af46e9e2a Changes since SDL 1.2.0 release
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diff changeset
462 alpha >>= 3; /* downscale alpha to 5 bits */
0
74212992fb08 Initial revision
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parents:
diff changeset
463
1
cf2af46e9e2a Changes since SDL 1.2.0 release
Sam Lantinga <slouken@lokigames.com>
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diff changeset
464 while(height--) {
cf2af46e9e2a Changes since SDL 1.2.0 release
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diff changeset
465 DUFFS_LOOP4({
cf2af46e9e2a Changes since SDL 1.2.0 release
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diff changeset
466 Uint32 s = *srcp++;
cf2af46e9e2a Changes since SDL 1.2.0 release
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diff changeset
467 Uint32 d = *dstp;
cf2af46e9e2a Changes since SDL 1.2.0 release
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diff changeset
468 /*
cf2af46e9e2a Changes since SDL 1.2.0 release
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469 * shift out the middle component (green) to
cf2af46e9e2a Changes since SDL 1.2.0 release
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diff changeset
470 * the high 16 bits, and process all three RGB
cf2af46e9e2a Changes since SDL 1.2.0 release
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diff changeset
471 * components at the same time.
cf2af46e9e2a Changes since SDL 1.2.0 release
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472 */
cf2af46e9e2a Changes since SDL 1.2.0 release
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diff changeset
473 s = (s | s << 16) & 0x03e07c1f;
cf2af46e9e2a Changes since SDL 1.2.0 release
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474 d = (d | d << 16) & 0x03e07c1f;
cf2af46e9e2a Changes since SDL 1.2.0 release
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475 d += (s - d) * alpha >> 5;
cf2af46e9e2a Changes since SDL 1.2.0 release
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476 d &= 0x03e07c1f;
cf2af46e9e2a Changes since SDL 1.2.0 release
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diff changeset
477 *dstp++ = d | d >> 16;
cf2af46e9e2a Changes since SDL 1.2.0 release
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diff changeset
478 }, width);
cf2af46e9e2a Changes since SDL 1.2.0 release
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479 srcp += srcskip;
cf2af46e9e2a Changes since SDL 1.2.0 release
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diff changeset
480 dstp += dstskip;
cf2af46e9e2a Changes since SDL 1.2.0 release
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481 }
0
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482 }
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diff changeset
483 }
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diff changeset
484
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diff changeset
485 /* fast ARGB8888->RGB565 blending with pixel alpha */
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diff changeset
486 static void BlitARGBto565PixelAlpha(SDL_BlitInfo *info)
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diff changeset
487 {
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diff changeset
488 int width = info->d_width;
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489 int height = info->d_height;
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490 Uint32 *srcp = (Uint32 *)info->s_pixels;
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diff changeset
491 int srcskip = info->s_skip >> 2;
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492 Uint16 *dstp = (Uint16 *)info->d_pixels;
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493 int dstskip = info->d_skip >> 1;
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494
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495 while(height--) {
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496 DUFFS_LOOP4({
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497 Uint32 s = *srcp;
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diff changeset
498 unsigned alpha = s >> 27; /* downscale alpha to 5 bits */
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diff changeset
499 /* FIXME: Here we special-case opaque alpha since the
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diff changeset
500 compositioning used (>>8 instead of /255) doesn't handle
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parents:
diff changeset
501 it correctly. Also special-case alpha=0 for speed?
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502 Benchmark this! */
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503 if(alpha == (SDL_ALPHA_OPAQUE >> 3)) {
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504 *dstp = (s >> 8 & 0xf800) + (s >> 5 & 0x7e0)
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505 + (s >> 3 & 0x1f);
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506 } else {
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507 Uint32 d = *dstp;
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508 /*
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diff changeset
509 * convert source and destination to G0RAB65565
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510 * and blend all components at the same time
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diff changeset
511 */
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Sam Lantinga <slouken@lokigames.com>
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diff changeset
512 s = ((s & 0xfc00) << 11) + (s >> 8 & 0xf800)
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Sam Lantinga <slouken@lokigames.com>
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513 + (s >> 3 & 0x1f);
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diff changeset
514 d = (d | d << 16) & 0x07e0f81f;
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515 d += (s - d) * alpha >> 5;
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diff changeset
516 d &= 0x07e0f81f;
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diff changeset
517 *dstp = d | d >> 16;
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diff changeset
518 }
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519 srcp++;
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parents:
diff changeset
520 dstp++;
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diff changeset
521 }, width);
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522 srcp += srcskip;
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523 dstp += dstskip;
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Sam Lantinga <slouken@lokigames.com>
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diff changeset
524 }
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diff changeset
525 }
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Sam Lantinga <slouken@lokigames.com>
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diff changeset
526
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
527 /* fast ARGB8888->RGB555 blending with pixel alpha */
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
528 static void BlitARGBto555PixelAlpha(SDL_BlitInfo *info)
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
529 {
74212992fb08 Initial revision
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diff changeset
530 int width = info->d_width;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
531 int height = info->d_height;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
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532 Uint32 *srcp = (Uint32 *)info->s_pixels;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
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533 int srcskip = info->s_skip >> 2;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
534 Uint16 *dstp = (Uint16 *)info->d_pixels;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
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diff changeset
535 int dstskip = info->d_skip >> 1;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
536
74212992fb08 Initial revision
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parents:
diff changeset
537 while(height--) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
538 DUFFS_LOOP4({
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
539 unsigned alpha;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
540 Uint32 s = *srcp;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
541 alpha = s >> 27; /* downscale alpha to 5 bits */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
542 /* FIXME: Here we special-case opaque alpha since the
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
543 compositioning used (>>8 instead of /255) doesn't handle
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
544 it correctly. Also special-case alpha=0 for speed?
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
545 Benchmark this! */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
546 if(alpha == (SDL_ALPHA_OPAQUE >> 3)) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
547 *dstp = (s >> 9 & 0x7c00) + (s >> 6 & 0x3e0)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
548 + (s >> 3 & 0x1f);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
549 } else {
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
550 Uint32 d = *dstp;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
551 /*
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
552 * convert source and destination to G0RAB65565
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
553 * and blend all components at the same time
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
554 */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
555 s = ((s & 0xf800) << 10) + (s >> 9 & 0x7c00)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
556 + (s >> 3 & 0x1f);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
557 d = (d | d << 16) & 0x03e07c1f;
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parents:
diff changeset
558 d += (s - d) * alpha >> 5;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
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diff changeset
559 d &= 0x03e07c1f;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
560 *dstp = d | d >> 16;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
561 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
562 srcp++;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
563 dstp++;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
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diff changeset
564 }, width);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
565 srcp += srcskip;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
566 dstp += dstskip;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
567 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
568 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
569
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
570 /* General (slow) N->N blending with per-surface alpha */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
571 static void BlitNtoNSurfaceAlpha(SDL_BlitInfo *info)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
572 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
573 int width = info->d_width;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
574 int height = info->d_height;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
575 Uint8 *src = info->s_pixels;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
576 int srcskip = info->s_skip;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
577 Uint8 *dst = info->d_pixels;
74212992fb08 Initial revision
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parents:
diff changeset
578 int dstskip = info->d_skip;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
579 SDL_PixelFormat *srcfmt = info->src;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
580 SDL_PixelFormat *dstfmt = info->dst;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
581 int srcbpp = srcfmt->BytesPerPixel;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
582 int dstbpp = dstfmt->BytesPerPixel;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
583 unsigned sA = srcfmt->alpha;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
584 unsigned dA = dstfmt->Amask ? SDL_ALPHA_OPAQUE : 0;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
585
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
586 while ( height-- ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
587 DUFFS_LOOP4(
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
588 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
589 Uint32 pixel;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
590 unsigned sR;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
591 unsigned sG;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
592 unsigned sB;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
593 unsigned dR;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
594 unsigned dG;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
595 unsigned dB;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
596 DISEMBLE_RGB(src, srcbpp, srcfmt, pixel, sR, sG, sB);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
597 DISEMBLE_RGB(dst, dstbpp, dstfmt, pixel, dR, dG, dB);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
598 ALPHA_BLEND(sR, sG, sB, sA, dR, dG, dB);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
599 ASSEMBLE_RGBA(dst, dstbpp, dstfmt, dR, dG, dB, dA);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
600 src += srcbpp;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
601 dst += dstbpp;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
602 },
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
603 width);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
604 src += srcskip;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
605 dst += dstskip;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
606 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
607 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
608
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
609 /* General (slow) colorkeyed N->N blending with per-surface alpha */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
610 static void BlitNtoNSurfaceAlphaKey(SDL_BlitInfo *info)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
611 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
612 int width = info->d_width;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
613 int height = info->d_height;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
614 Uint8 *src = info->s_pixels;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
615 int srcskip = info->s_skip;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
616 Uint8 *dst = info->d_pixels;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
617 int dstskip = info->d_skip;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
618 SDL_PixelFormat *srcfmt = info->src;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
619 SDL_PixelFormat *dstfmt = info->dst;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
620 Uint32 ckey = srcfmt->colorkey;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
621 int srcbpp = srcfmt->BytesPerPixel;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
622 int dstbpp = dstfmt->BytesPerPixel;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
623 unsigned sA = srcfmt->alpha;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
624 unsigned dA = dstfmt->Amask ? SDL_ALPHA_OPAQUE : 0;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
625
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
626 while ( height-- ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
627 DUFFS_LOOP4(
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
628 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
629 Uint32 pixel;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
630 unsigned sR;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
631 unsigned sG;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
632 unsigned sB;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
633 unsigned dR;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
634 unsigned dG;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
635 unsigned dB;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
636 RETRIEVE_RGB_PIXEL(src, srcbpp, pixel);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
637 if(pixel != ckey) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
638 RGB_FROM_PIXEL(pixel, srcfmt, sR, sG, sB);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
639 DISEMBLE_RGB(dst, dstbpp, dstfmt, pixel, dR, dG, dB);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
640 ALPHA_BLEND(sR, sG, sB, sA, dR, dG, dB);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
641 ASSEMBLE_RGBA(dst, dstbpp, dstfmt, dR, dG, dB, dA);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
642 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
643 src += srcbpp;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
644 dst += dstbpp;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
645 },
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
646 width);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
647 src += srcskip;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
648 dst += dstskip;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
649 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
650 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
651
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
652 /* General (slow) N->N blending with pixel alpha */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
653 static void BlitNtoNPixelAlpha(SDL_BlitInfo *info)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
654 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
655 int width = info->d_width;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
656 int height = info->d_height;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
657 Uint8 *src = info->s_pixels;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
658 int srcskip = info->s_skip;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
659 Uint8 *dst = info->d_pixels;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
660 int dstskip = info->d_skip;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
661 SDL_PixelFormat *srcfmt = info->src;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
662 SDL_PixelFormat *dstfmt = info->dst;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
663
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
664 int srcbpp;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
665 int dstbpp;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
666
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
667 /* Set up some basic variables */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
668 srcbpp = srcfmt->BytesPerPixel;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
669 dstbpp = dstfmt->BytesPerPixel;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
670
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
671 /* FIXME: for 8bpp source alpha, this doesn't get opaque values
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
672 quite right. for <8bpp source alpha, it gets them very wrong
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
673 (check all macros!)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
674 It is unclear whether there is a good general solution that doesn't
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
675 need a branch (or a divide). */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
676 while ( height-- ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
677 DUFFS_LOOP4(
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
678 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
679 Uint32 pixel;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
680 unsigned sR;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
681 unsigned sG;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
682 unsigned sB;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
683 unsigned dR;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
684 unsigned dG;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
685 unsigned dB;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
686 unsigned sA;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
687 unsigned dA;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
688 DISEMBLE_RGBA(src, srcbpp, srcfmt, pixel, sR, sG, sB, sA);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
689 DISEMBLE_RGBA(dst, dstbpp, dstfmt, pixel, dR, dG, dB, dA);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
690 ALPHA_BLEND(sR, sG, sB, sA, dR, dG, dB);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
691 ASSEMBLE_RGBA(dst, dstbpp, dstfmt, dR, dG, dB, dA);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
692 src += srcbpp;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
693 dst += dstbpp;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
694 },
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
695 width);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
696 src += srcskip;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
697 dst += dstskip;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
698 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
699 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
700
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
701
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
702 SDL_loblit SDL_CalculateAlphaBlit(SDL_Surface *surface, int blit_index)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
703 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
704 SDL_PixelFormat *sf = surface->format;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
705 SDL_PixelFormat *df = surface->map->dst->format;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
706
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
707 if(sf->Amask == 0) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
708 if((surface->flags & SDL_SRCCOLORKEY) == SDL_SRCCOLORKEY) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
709 if(df->BytesPerPixel == 1)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
710 return BlitNto1SurfaceAlphaKey;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
711 else
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
712 return BlitNtoNSurfaceAlphaKey;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
713 } else {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
714 /* Per-surface alpha blits */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
715 switch(df->BytesPerPixel) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
716 case 1:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
717 return BlitNto1SurfaceAlpha;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
718
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
719 case 2:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
720 if(surface->map->identity) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
721 if(df->Gmask == 0x7e0)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
722 return Blit565to565SurfaceAlpha;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
723 else if(df->Gmask == 0x3e0)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
724 return Blit555to555SurfaceAlpha;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
725 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
726 return BlitNtoNSurfaceAlpha;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
727
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
728 case 4:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
729 if(sf->Rmask == df->Rmask
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
730 && sf->Gmask == df->Gmask
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
731 && sf->Bmask == df->Bmask
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
732 && (sf->Rmask | sf->Gmask | sf->Bmask) == 0xffffff
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
733 && sf->BytesPerPixel == 4)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
734 return BlitRGBtoRGBSurfaceAlpha;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
735 else
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
736 return BlitNtoNSurfaceAlpha;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
737
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
738 case 3:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
739 default:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
740 return BlitNtoNSurfaceAlpha;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
741 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
742 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
743 } else {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
744 /* Per-pixel alpha blits */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
745 switch(df->BytesPerPixel) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
746 case 1:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
747 return BlitNto1PixelAlpha;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
748
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
749 case 2:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
750 if(sf->BytesPerPixel == 4 && sf->Amask == 0xff000000
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
751 && sf->Gmask == 0xff00
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
752 && ((sf->Rmask == 0xff && df->Rmask == 0x1f)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
753 || (sf->Bmask == 0xff && df->Bmask == 0x1f))) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
754 if(df->Gmask == 0x7e0)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
755 return BlitARGBto565PixelAlpha;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
756 else if(df->Gmask == 0x3e0)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
757 return BlitARGBto555PixelAlpha;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
758 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
759 return BlitNtoNPixelAlpha;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
760
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
761 case 4:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
762 if(sf->Amask == 0xff000000
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
763 && sf->Rmask == df->Rmask
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
764 && sf->Gmask == df->Gmask
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
765 && sf->Bmask == df->Bmask
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
766 && sf->BytesPerPixel == 4)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
767 return BlitRGBtoRGBPixelAlpha;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
768 return BlitNtoNPixelAlpha;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
769
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
770 case 3:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
771 default:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
772 return BlitNtoNPixelAlpha;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
773 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
774 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
775 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
776