annotate src/video/SDL_blit_0.c @ 1057:e9d23bb80140

Date: Mon, 02 May 2005 04:23:16 -0500 From: Jonathan Atkins Subject: Re: [PATCH] *CRITICAL* 8bit direct RGB palette not being created I think that SDL_AllocFormat should create the palette for all 8bit surfaces. And when the RGBAmasks match the normal 3:3:2:0 we need to apply the old behavior. If the mask doesn't match that, then we need to make the right palette assuming the masks are valid (I don't think we validate any masks for high color surfaces...so we wouldn't here) Then there's always a palette available for the 8bit surfaces. This restores the normal behavior and allows for masks to create palettes automatically for odd masks even, which would be a neato thing to have in there, as SDL never did this before.
author Sam Lantinga <slouken@libsdl.org>
date Mon, 16 May 2005 05:34:58 +0000
parents b8d311d90021
children e6c91fd1911e
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2004 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
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20 slouken@libsdl.org
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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 #include <string.h>
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30
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31 #include "SDL_types.h"
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32 #include "SDL_video.h"
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33 #include "SDL_blit.h"
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34
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35 /* Functions to blit from bitmaps to other surfaces */
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36
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37 static void BlitBto1(SDL_BlitInfo *info)
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38 {
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39 int c;
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40 int width, height;
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41 Uint8 *src, *map, *dst;
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42 int srcskip, dstskip;
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43
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44 /* Set up some basic variables */
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45 width = info->d_width;
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46 height = info->d_height;
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47 src = info->s_pixels;
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48 srcskip = info->s_skip;
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49 dst = info->d_pixels;
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50 dstskip = info->d_skip;
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51 map = info->table;
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52 srcskip += width-(width+7)/8;
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53
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54 if ( map ) {
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55 while ( height-- ) {
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56 Uint8 byte = 0, bit;
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57 for ( c=0; c<width; ++c ) {
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58 if ( (c&7) == 0 ) {
0
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59 byte = *src++;
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60 }
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61 bit = (byte&0x80)>>7;
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62 if ( 1 ) {
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63 *dst = map[bit];
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64 }
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65 dst++;
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66 byte <<= 1;
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67 }
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68 src += srcskip;
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69 dst += dstskip;
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70 }
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71 } else {
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72 while ( height-- ) {
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73 Uint8 byte = 0, bit;
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74 for ( c=0; c<width; ++c ) {
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75 if ( (c&7) == 0 ) {
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76 byte = *src++;
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77 }
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78 bit = (byte&0x80)>>7;
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79 if ( 1 ) {
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80 *dst = bit;
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81 }
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82 dst++;
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83 byte <<= 1;
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84 }
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85 src += srcskip;
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86 dst += dstskip;
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87 }
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88 }
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89 }
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90 static void BlitBto2(SDL_BlitInfo *info)
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91 {
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92 int c;
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93 int width, height;
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94 Uint8 *src;
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95 Uint16 *map, *dst;
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96 int srcskip, dstskip;
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97
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98 /* Set up some basic variables */
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99 width = info->d_width;
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100 height = info->d_height;
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101 src = info->s_pixels;
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102 srcskip = info->s_skip;
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103 dst = (Uint16 *)info->d_pixels;
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104 dstskip = info->d_skip/2;
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105 map = (Uint16 *)info->table;
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106 srcskip += width-(width+7)/8;
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107
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108 while ( height-- ) {
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109 Uint8 byte = 0, bit;
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110 for ( c=0; c<width; ++c ) {
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111 if ( (c&7) == 0 ) {
0
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112 byte = *src++;
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113 }
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114 bit = (byte&0x80)>>7;
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115 if ( 1 ) {
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116 *dst = map[bit];
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117 }
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118 byte <<= 1;
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119 dst++;
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120 }
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121 src += srcskip;
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122 dst += dstskip;
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123 }
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124 }
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125 static void BlitBto3(SDL_BlitInfo *info)
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126 {
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127 int c, o;
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128 int width, height;
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129 Uint8 *src, *map, *dst;
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130 int srcskip, dstskip;
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131
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132 /* Set up some basic variables */
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133 width = info->d_width;
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134 height = info->d_height;
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135 src = info->s_pixels;
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136 srcskip = info->s_skip;
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137 dst = info->d_pixels;
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138 dstskip = info->d_skip;
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139 map = info->table;
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140 srcskip += width-(width+7)/8;
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141
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142 while ( height-- ) {
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143 Uint8 byte = 0, bit;
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144 for ( c=0; c<width; ++c ) {
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145 if ( (c&7) == 0 ) {
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146 byte = *src++;
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147 }
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148 bit = (byte&0x80)>>7;
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149 if ( 1 ) {
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150 o = bit * 4;
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151 dst[0] = map[o++];
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152 dst[1] = map[o++];
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153 dst[2] = map[o++];
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154 }
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155 byte <<= 1;
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156 dst += 3;
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157 }
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158 src += srcskip;
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159 dst += dstskip;
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160 }
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161 }
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162 static void BlitBto4(SDL_BlitInfo *info)
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163 {
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164 int width, height;
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165 Uint8 *src;
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166 Uint32 *map, *dst;
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167 int srcskip, dstskip;
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168 int c;
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169
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170 /* Set up some basic variables */
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171 width = info->d_width;
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172 height = info->d_height;
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173 src = info->s_pixels;
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174 srcskip = info->s_skip;
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175 dst = (Uint32 *)info->d_pixels;
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176 dstskip = info->d_skip/4;
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177 map = (Uint32 *)info->table;
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178 srcskip += width-(width+7)/8;
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179
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180 while ( height-- ) {
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181 Uint8 byte = 0, bit;
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182 for ( c=0; c<width; ++c ) {
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183 if ( (c&7) == 0 ) {
0
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184 byte = *src++;
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185 }
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186 bit = (byte&0x80)>>7;
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187 if ( 1 ) {
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188 *dst = map[bit];
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189 }
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190 byte <<= 1;
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191 dst++;
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192 }
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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
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198 static void BlitBto1Key(SDL_BlitInfo *info)
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199 {
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200 int width = info->d_width;
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201 int height = info->d_height;
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202 Uint8 *src = info->s_pixels;
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203 Uint8 *dst = info->d_pixels;
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204 int srcskip = info->s_skip;
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205 int dstskip = info->d_skip;
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206 Uint32 ckey = info->src->colorkey;
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207 Uint8 *palmap = info->table;
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208 int c;
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209
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210 /* Set up some basic variables */
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211 srcskip += width-(width+7)/8;
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212
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213 if ( palmap ) {
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214 while ( height-- ) {
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215 Uint8 byte = 0, bit;
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216 for ( c=0; c<width; ++c ) {
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217 if ( (c&7) == 0 ) {
0
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218 byte = *src++;
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219 }
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220 bit = (byte&0x80)>>7;
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221 if ( bit != ckey ) {
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222 *dst = palmap[bit];
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223 }
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224 dst++;
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225 byte <<= 1;
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226 }
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227 src += srcskip;
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228 dst += dstskip;
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229 }
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230 } else {
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231 while ( height-- ) {
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232 Uint8 byte = 0, bit;
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233 for ( c=0; c<width; ++c ) {
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234 if ( (c&7) == 0 ) {
0
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235 byte = *src++;
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236 }
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237 bit = (byte&0x80)>>7;
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238 if ( bit != ckey ) {
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239 *dst = bit;
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240 }
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241 dst++;
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242 byte <<= 1;
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243 }
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244 src += srcskip;
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245 dst += dstskip;
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246 }
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247 }
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248 }
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249
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250 static void BlitBto2Key(SDL_BlitInfo *info)
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251 {
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252 int width = info->d_width;
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253 int height = info->d_height;
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254 Uint8 *src = info->s_pixels;
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255 Uint16 *dstp = (Uint16 *)info->d_pixels;
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256 int srcskip = info->s_skip;
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257 int dstskip = info->d_skip;
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258 Uint32 ckey = info->src->colorkey;
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259 Uint8 *palmap = info->table;
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260 int c;
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261
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262 /* Set up some basic variables */
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263 srcskip += width-(width+7)/8;
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264 dstskip /= 2;
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265
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266 while ( height-- ) {
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267 Uint8 byte = 0, bit;
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268 for ( c=0; c<width; ++c ) {
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269 if ( (c&7) == 0 ) {
0
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270 byte = *src++;
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271 }
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272 bit = (byte&0x80)>>7;
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273 if ( bit != ckey ) {
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274 *dstp=((Uint16 *)palmap)[bit];
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275 }
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276 byte <<= 1;
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277 dstp++;
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278 }
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279 src += srcskip;
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280 dstp += dstskip;
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281 }
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282 }
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283
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284 static void BlitBto3Key(SDL_BlitInfo *info)
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285 {
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286 int width = info->d_width;
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287 int height = info->d_height;
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288 Uint8 *src = info->s_pixels;
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289 Uint8 *dst = info->d_pixels;
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290 int srcskip = info->s_skip;
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291 int dstskip = info->d_skip;
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292 Uint32 ckey = info->src->colorkey;
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293 Uint8 *palmap = info->table;
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294 int c;
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295
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296 /* Set up some basic variables */
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297 srcskip += width-(width+7)/8;
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298
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299 while ( height-- ) {
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300 Uint8 byte = 0, bit;
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301 for ( c=0; c<width; ++c ) {
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302 if ( (c&7) == 0 ) {
0
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303 byte = *src++;
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304 }
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305 bit = (byte&0x80)>>7;
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306 if ( bit != ckey ) {
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307 memcpy(dst, &palmap[bit*4], 3);
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308 }
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309 byte <<= 1;
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310 dst += 3;
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311 }
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312 src += srcskip;
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313 dst += dstskip;
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314 }
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315 }
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316
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317 static void BlitBto4Key(SDL_BlitInfo *info)
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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 Uint8 *src = info->s_pixels;
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322 Uint32 *dstp = (Uint32 *)info->d_pixels;
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323 int srcskip = info->s_skip;
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324 int dstskip = info->d_skip;
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325 Uint32 ckey = info->src->colorkey;
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326 Uint8 *palmap = info->table;
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327 int c;
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328
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329 /* Set up some basic variables */
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330 srcskip += width-(width+7)/8;
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331 dstskip /= 4;
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diff changeset
332
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333 while ( height-- ) {
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334 Uint8 byte = 0, bit;
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335 for ( c=0; c<width; ++c ) {
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336 if ( (c&7) == 0 ) {
0
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337 byte = *src++;
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338 }
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339 bit = (byte&0x80)>>7;
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parents:
diff changeset
340 if ( bit != ckey ) {
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parents:
diff changeset
341 *dstp=((Uint32 *)palmap)[bit];
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parents:
diff changeset
342 }
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
343 byte <<= 1;
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parents:
diff changeset
344 dstp++;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
345 }
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parents:
diff changeset
346 src += srcskip;
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parents:
diff changeset
347 dstp += dstskip;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
348 }
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
349 }
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
350
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parents:
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351 static void BlitBtoNAlpha(SDL_BlitInfo *info)
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parents:
diff changeset
352 {
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parents:
diff changeset
353 int width = info->d_width;
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parents:
diff changeset
354 int height = info->d_height;
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parents:
diff changeset
355 Uint8 *src = info->s_pixels;
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parents:
diff changeset
356 Uint8 *dst = info->d_pixels;
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Sam Lantinga <slouken@lokigames.com>
parents:
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357 int srcskip = info->s_skip;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
358 int dstskip = info->d_skip;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
359 const SDL_Color *srcpal = info->src->palette->colors;
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parents:
diff changeset
360 SDL_PixelFormat *dstfmt = info->dst;
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parents:
diff changeset
361 int dstbpp;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
362 int c;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
363 const int A = info->src->alpha;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
364
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
365 /* Set up some basic variables */
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parents:
diff changeset
366 dstbpp = dstfmt->BytesPerPixel;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
367 srcskip += width-(width+7)/8;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
368
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
369 while ( height-- ) {
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
370 Uint8 byte = 0, bit;
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parents:
diff changeset
371 for ( c=0; c<width; ++c ) {
91
e85e03f195b4 From: "Markus F.X.J. Oberhumer"
Sam Lantinga <slouken@lokigames.com>
parents: 0
diff changeset
372 if ( (c&7) == 0 ) {
0
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parents:
diff changeset
373 byte = *src++;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
374 }
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
375 bit = (byte&0x80)>>7;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
376 if ( 1 ) {
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
377 Uint32 pixel;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
378 unsigned sR, sG, sB;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
379 unsigned dR, dG, dB;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
380 sR = srcpal[bit].r;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
381 sG = srcpal[bit].g;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
382 sB = srcpal[bit].b;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
383 DISEMBLE_RGB(dst, dstbpp, dstfmt,
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
384 pixel, dR, dG, dB);
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
385 ALPHA_BLEND(sR, sG, sB, A, dR, dG, dB);
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
386 ASSEMBLE_RGB(dst, dstbpp, dstfmt, dR, dG, dB);
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
387 }
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
388 byte <<= 1;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
389 dst += dstbpp;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
390 }
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
391 src += srcskip;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
392 dst += dstskip;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
393 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
394 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
395
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
396 static void BlitBtoNAlphaKey(SDL_BlitInfo *info)
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
397 {
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
398 int width = info->d_width;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
399 int height = info->d_height;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
400 Uint8 *src = info->s_pixels;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
401 Uint8 *dst = info->d_pixels;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
402 int srcskip = info->s_skip;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
403 int dstskip = info->d_skip;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
404 SDL_PixelFormat *srcfmt = info->src;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
405 SDL_PixelFormat *dstfmt = info->dst;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
406 const SDL_Color *srcpal = srcfmt->palette->colors;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
407 int dstbpp;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
408 int c;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
409 const int A = srcfmt->alpha;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
410 Uint32 ckey = srcfmt->colorkey;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
411
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
412 /* Set up some basic variables */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
413 dstbpp = dstfmt->BytesPerPixel;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
414 srcskip += width-(width+7)/8;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
415
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
416 while ( height-- ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
417 Uint8 byte = 0, bit;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
418 for ( c=0; c<width; ++c ) {
91
e85e03f195b4 From: "Markus F.X.J. Oberhumer"
Sam Lantinga <slouken@lokigames.com>
parents: 0
diff changeset
419 if ( (c&7) == 0 ) {
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
420 byte = *src++;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
421 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
422 bit = (byte&0x80)>>7;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
423 if ( bit != ckey ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
424 int sR, sG, sB;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
425 int dR, dG, dB;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
426 Uint32 pixel;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
427 sR = srcpal[bit].r;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
428 sG = srcpal[bit].g;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
429 sB = srcpal[bit].b;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
430 DISEMBLE_RGB(dst, dstbpp, dstfmt,
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
431 pixel, dR, dG, dB);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
432 ALPHA_BLEND(sR, sG, sB, A, dR, dG, dB);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
433 ASSEMBLE_RGB(dst, dstbpp, dstfmt, dR, dG, dB);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
434 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
435 byte <<= 1;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
436 dst += dstbpp;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
437 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
438 src += srcskip;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
439 dst += dstskip;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
440 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
441 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
442
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
443 static SDL_loblit bitmap_blit[] = {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
444 NULL, BlitBto1, BlitBto2, BlitBto3, BlitBto4
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
445 };
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
446
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
447 static SDL_loblit colorkey_blit[] = {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
448 NULL, BlitBto1Key, BlitBto2Key, BlitBto3Key, BlitBto4Key
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
449 };
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
450
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
451 SDL_loblit SDL_CalculateBlit0(SDL_Surface *surface, int blit_index)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
452 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
453 int which;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
454
1057
e9d23bb80140 Date: Mon, 02 May 2005 04:23:16 -0500
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
455 if ( surface->format->BitsPerPixel > 1 ) {
e9d23bb80140 Date: Mon, 02 May 2005 04:23:16 -0500
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
456 /* We don't support sub 8-bit packed pixel modes */
e9d23bb80140 Date: Mon, 02 May 2005 04:23:16 -0500
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
457 return NULL;
e9d23bb80140 Date: Mon, 02 May 2005 04:23:16 -0500
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
458 }
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
459 if ( surface->map->dst->format->BitsPerPixel < 8 ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
460 which = 0;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
461 } else {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
462 which = surface->map->dst->format->BytesPerPixel;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
463 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
464 switch(blit_index) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
465 case 0: /* copy */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
466 return bitmap_blit[which];
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
467
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
468 case 1: /* colorkey */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
469 return colorkey_blit[which];
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
470
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
471 case 2: /* alpha */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
472 return which >= 2 ? BlitBtoNAlpha : NULL;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
473
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
474 case 4: /* alpha + colorkey */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
475 return which >= 2 ? BlitBtoNAlphaKey : NULL;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
476 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
477 return NULL;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
478 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
479