Mercurial > sdl-ios-xcode
annotate src/video/SDL_pixels.c @ 1551:02e19471a694
Fixed bug #4
[Note: I'm applying this patch since it's a cleaner version of what's already implemented, and supports this controller on older kernels. I'll ask to make sure this doesn't break on the new kernels where it's no longer necessary]
Date: Mon, 21 Mar 2005 09:41:11 -0500
From: Chris Nelson
Subject: SDL Patch
Hey, Ryan.
I submitted the following patch about a year ago. It's just a simple
patch for the linux port, to make multiple joysticks each appear to SDL
as their own device, if they are on the same USB port (specifically,
these guys
<http://www.consoleplus.co.uk/product_info.php?pName=super-joybox-5-quad-joypad-converter>,
which allow 4 Playstation2 controllers to be accessed via a single USB
port). Without this patch, SDL pretty much drops the ball, and reports
that there are 4 joysticks available when less than that number are
plugged in.
My work built upon the work of another person with the same device. When
I submitted the patch to the list, he tested it, but it didn't work for
him, so the patch was never accepted. Maybe about 3 times in the past
year, I've tried to email the guy, to see if he couldn't run my new
version, complete with debug code to diagnose the problem he was having.
He never got back to me.
So, I'm attaching the patch. I wish I knew why it didn't work for him,
but I've been using it for the last year with no problems. Let me know
if you need any more information, or have any ideas as to how I could
test it. I'd like to see it in the tree, but I want to make sure it works.
-Chris
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Sun, 19 Mar 2006 06:31:34 +0000 |
| parents | d910939febfa |
| children | 61c237f69076 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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3 Copyright (C) 1997-2006 Sam Lantinga |
| 0 | 4 |
| 5 This library is free software; you can redistribute it and/or | |
|
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6 modify it under the terms of the GNU Lesser General Public |
| 0 | 7 License as published by the Free Software Foundation; either |
|
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8 version 2.1 of the License, or (at your option) any later version. |
| 0 | 9 |
| 10 This library is distributed in the hope that it will be useful, | |
| 11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
|
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13 Lesser General Public License for more details. |
| 0 | 14 |
|
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15 You should have received a copy of the GNU Lesser General Public |
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16 License along with this library; if not, write to the Free Software |
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 0 | 18 |
| 19 Sam Lantinga | |
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20 slouken@libsdl.org |
| 0 | 21 */ |
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22 #include "SDL_config.h" |
| 0 | 23 |
| 24 /* General (mostly internal) pixel/color manipulation routines for SDL */ | |
| 25 | |
| 26 #include "SDL_endian.h" | |
| 27 #include "SDL_video.h" | |
| 28 #include "SDL_sysvideo.h" | |
| 29 #include "SDL_blit.h" | |
| 30 #include "SDL_pixels_c.h" | |
| 31 #include "SDL_RLEaccel_c.h" | |
| 32 | |
| 33 /* Helper functions */ | |
| 34 /* | |
| 35 * Allocate a pixel format structure and fill it according to the given info. | |
| 36 */ | |
| 37 SDL_PixelFormat *SDL_AllocFormat(int bpp, | |
| 38 Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask) | |
| 39 { | |
| 40 SDL_PixelFormat *format; | |
| 41 Uint32 mask; | |
| 42 | |
| 43 /* Allocate an empty pixel format structure */ | |
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44 format = SDL_malloc(sizeof(*format)); |
| 0 | 45 if ( format == NULL ) { |
| 46 SDL_OutOfMemory(); | |
| 47 return(NULL); | |
| 48 } | |
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49 SDL_memset(format, 0, sizeof(*format)); |
| 0 | 50 format->alpha = SDL_ALPHA_OPAQUE; |
| 51 | |
| 52 /* Set up the format */ | |
| 53 format->BitsPerPixel = bpp; | |
| 54 format->BytesPerPixel = (bpp+7)/8; | |
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55 if ( Rmask || Bmask || Gmask ) { /* Packed pixels with custom mask */ |
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56 format->palette = NULL; |
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57 format->Rshift = 0; |
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58 format->Rloss = 8; |
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59 if ( Rmask ) { |
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60 for ( mask = Rmask; !(mask&0x01); mask >>= 1 ) |
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61 ++format->Rshift; |
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62 for ( ; (mask&0x01); mask >>= 1 ) |
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63 --format->Rloss; |
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64 } |
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65 format->Gshift = 0; |
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66 format->Gloss = 8; |
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67 if ( Gmask ) { |
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68 for ( mask = Gmask; !(mask&0x01); mask >>= 1 ) |
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69 ++format->Gshift; |
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70 for ( ; (mask&0x01); mask >>= 1 ) |
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71 --format->Gloss; |
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72 } |
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73 format->Bshift = 0; |
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74 format->Bloss = 8; |
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75 if ( Bmask ) { |
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76 for ( mask = Bmask; !(mask&0x01); mask >>= 1 ) |
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77 ++format->Bshift; |
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78 for ( ; (mask&0x01); mask >>= 1 ) |
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79 --format->Bloss; |
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80 } |
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81 format->Ashift = 0; |
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82 format->Aloss = 8; |
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83 if ( Amask ) { |
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84 for ( mask = Amask; !(mask&0x01); mask >>= 1 ) |
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85 ++format->Ashift; |
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86 for ( ; (mask&0x01); mask >>= 1 ) |
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87 --format->Aloss; |
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88 } |
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89 format->Rmask = Rmask; |
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90 format->Gmask = Gmask; |
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91 format->Bmask = Bmask; |
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92 format->Amask = Amask; |
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93 } else if ( bpp > 8 ) { /* Packed pixels with standard mask */ |
| 0 | 94 /* R-G-B */ |
| 95 if ( bpp > 24 ) | |
| 96 bpp = 24; | |
| 97 format->Rloss = 8-(bpp/3); | |
| 98 format->Gloss = 8-(bpp/3)-(bpp%3); | |
| 99 format->Bloss = 8-(bpp/3); | |
| 100 format->Rshift = ((bpp/3)+(bpp%3))+(bpp/3); | |
| 101 format->Gshift = (bpp/3); | |
| 102 format->Bshift = 0; | |
| 103 format->Rmask = ((0xFF>>format->Rloss)<<format->Rshift); | |
| 104 format->Gmask = ((0xFF>>format->Gloss)<<format->Gshift); | |
| 105 format->Bmask = ((0xFF>>format->Bloss)<<format->Bshift); | |
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106 } else { |
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107 /* Palettized formats have no mask info */ |
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108 format->Rloss = 8; |
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109 format->Gloss = 8; |
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110 format->Bloss = 8; |
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111 format->Aloss = 8; |
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112 format->Rshift = 0; |
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113 format->Gshift = 0; |
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114 format->Bshift = 0; |
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115 format->Ashift = 0; |
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116 format->Rmask = 0; |
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117 format->Gmask = 0; |
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118 format->Bmask = 0; |
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119 format->Amask = 0; |
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120 } |
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121 if ( bpp <= 8 ) { /* Palettized mode */ |
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122 int ncolors = 1<<bpp; |
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123 #ifdef DEBUG_PALETTE |
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124 fprintf(stderr,"bpp=%d ncolors=%d\n",bpp,ncolors); |
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125 #endif |
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126 format->palette = (SDL_Palette *)SDL_malloc(sizeof(SDL_Palette)); |
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127 if ( format->palette == NULL ) { |
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128 SDL_FreeFormat(format); |
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129 SDL_OutOfMemory(); |
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130 return(NULL); |
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131 } |
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132 (format->palette)->ncolors = ncolors; |
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133 (format->palette)->colors = (SDL_Color *)SDL_malloc( |
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134 (format->palette)->ncolors*sizeof(SDL_Color)); |
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135 if ( (format->palette)->colors == NULL ) { |
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136 SDL_FreeFormat(format); |
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137 SDL_OutOfMemory(); |
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138 return(NULL); |
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139 } |
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140 if ( Rmask || Bmask || Gmask ) { |
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141 /* create palette according to masks */ |
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142 int i; |
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143 int Rm=0,Gm=0,Bm=0; |
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144 int Rw=0,Gw=0,Bw=0; |
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145 #ifdef ENABLE_PALETTE_ALPHA |
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146 int Am=0,Aw=0; |
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147 #endif |
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148 if(Rmask) |
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149 { |
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150 Rw=8-format->Rloss; |
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151 for(i=format->Rloss;i>0;i-=Rw) |
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152 Rm|=1<<i; |
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153 } |
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154 #ifdef DEBUG_PALETTE |
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155 fprintf(stderr,"Rw=%d Rm=0x%02X\n",Rw,Rm); |
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156 #endif |
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157 if(Gmask) |
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158 { |
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159 Gw=8-format->Gloss; |
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160 for(i=format->Gloss;i>0;i-=Gw) |
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161 Gm|=1<<i; |
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162 } |
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163 #ifdef DEBUG_PALETTE |
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164 fprintf(stderr,"Gw=%d Gm=0x%02X\n",Gw,Gm); |
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165 #endif |
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166 if(Bmask) |
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167 { |
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168 Bw=8-format->Bloss; |
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169 for(i=format->Bloss;i>0;i-=Bw) |
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170 Bm|=1<<i; |
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171 } |
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172 #ifdef DEBUG_PALETTE |
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173 fprintf(stderr,"Bw=%d Bm=0x%02X\n",Bw,Bm); |
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174 #endif |
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175 #ifdef ENABLE_PALETTE_ALPHA |
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176 if(Amask) |
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177 { |
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178 Aw=8-format->Aloss; |
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179 for(i=format->Aloss;i>0;i-=Aw) |
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180 Am|=1<<i; |
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181 } |
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182 # ifdef DEBUG_PALETTE |
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183 fprintf(stderr,"Aw=%d Am=0x%02X\n",Aw,Am); |
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184 # endif |
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185 #endif |
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186 for(i=0; i < ncolors; ++i) { |
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187 int r,g,b; |
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188 r=(i&Rmask)>>format->Rshift; |
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189 r=(r<<format->Rloss)|((r*Rm)>>Rw); |
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190 format->palette->colors[i].r=r; |
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191 |
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192 g=(i&Gmask)>>format->Gshift; |
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193 g=(g<<format->Gloss)|((g*Gm)>>Gw); |
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194 format->palette->colors[i].g=g; |
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195 |
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196 b=(i&Bmask)>>format->Bshift; |
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197 b=(b<<format->Bloss)|((b*Bm)>>Bw); |
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198 format->palette->colors[i].b=b; |
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199 |
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200 #ifdef ENABLE_PALETTE_ALPHA |
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201 a=(i&Amask)>>format->Ashift; |
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202 a=(a<<format->Aloss)|((a*Am)>>Aw); |
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203 format->palette->colors[i].unused=a; |
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204 #else |
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205 format->palette->colors[i].unused=0; |
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206 #endif |
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207 } |
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208 } else if ( ncolors == 2 ) { |
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209 /* Create a black and white bitmap palette */ |
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210 format->palette->colors[0].r = 0xFF; |
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211 format->palette->colors[0].g = 0xFF; |
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212 format->palette->colors[0].b = 0xFF; |
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213 format->palette->colors[1].r = 0x00; |
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214 format->palette->colors[1].g = 0x00; |
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215 format->palette->colors[1].b = 0x00; |
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216 } else { |
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217 /* Create an empty palette */ |
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218 SDL_memset((format->palette)->colors, 0, |
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219 (format->palette)->ncolors*sizeof(SDL_Color)); |
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220 } |
| 0 | 221 } |
| 222 return(format); | |
| 223 } | |
| 224 SDL_PixelFormat *SDL_ReallocFormat(SDL_Surface *surface, int bpp, | |
| 225 Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask) | |
| 226 { | |
| 227 if ( surface->format ) { | |
| 228 SDL_FreeFormat(surface->format); | |
| 229 SDL_FormatChanged(surface); | |
| 230 } | |
| 231 surface->format = SDL_AllocFormat(bpp, Rmask, Gmask, Bmask, Amask); | |
| 232 return surface->format; | |
| 233 } | |
| 234 | |
| 235 /* | |
| 236 * Change any previous mappings from/to the new surface format | |
| 237 */ | |
| 238 void SDL_FormatChanged(SDL_Surface *surface) | |
| 239 { | |
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240 static int format_version = 0; |
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241 ++format_version; |
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242 if ( format_version < 0 ) { /* It wrapped... */ |
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243 format_version = 1; |
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244 } |
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245 surface->format_version = format_version; |
| 0 | 246 SDL_InvalidateMap(surface->map); |
| 247 } | |
| 248 /* | |
| 249 * Free a previously allocated format structure | |
| 250 */ | |
| 251 void SDL_FreeFormat(SDL_PixelFormat *format) | |
| 252 { | |
| 253 if ( format ) { | |
| 254 if ( format->palette ) { | |
| 255 if ( format->palette->colors ) { | |
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256 SDL_free(format->palette->colors); |
| 0 | 257 } |
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258 SDL_free(format->palette); |
| 0 | 259 } |
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260 SDL_free(format); |
| 0 | 261 } |
| 262 } | |
| 263 /* | |
| 264 * Calculate an 8-bit (3 red, 3 green, 2 blue) dithered palette of colors | |
| 265 */ | |
| 266 void SDL_DitherColors(SDL_Color *colors, int bpp) | |
| 267 { | |
| 268 int i; | |
| 269 if(bpp != 8) | |
| 270 return; /* only 8bpp supported right now */ | |
| 271 | |
| 272 for(i = 0; i < 256; i++) { | |
| 273 int r, g, b; | |
| 274 /* map each bit field to the full [0, 255] interval, | |
| 275 so 0 is mapped to (0, 0, 0) and 255 to (255, 255, 255) */ | |
| 276 r = i & 0xe0; | |
| 277 r |= r >> 3 | r >> 6; | |
| 278 colors[i].r = r; | |
| 279 g = (i << 3) & 0xe0; | |
| 280 g |= g >> 3 | g >> 6; | |
| 281 colors[i].g = g; | |
| 282 b = i & 0x3; | |
| 283 b |= b << 2; | |
| 284 b |= b << 4; | |
| 285 colors[i].b = b; | |
| 286 } | |
| 287 } | |
| 288 /* | |
| 289 * Calculate the pad-aligned scanline width of a surface | |
| 290 */ | |
| 291 Uint16 SDL_CalculatePitch(SDL_Surface *surface) | |
| 292 { | |
| 293 Uint16 pitch; | |
| 294 | |
| 295 /* Surface should be 4-byte aligned for speed */ | |
| 296 pitch = surface->w*surface->format->BytesPerPixel; | |
| 297 switch (surface->format->BitsPerPixel) { | |
| 298 case 1: | |
| 299 pitch = (pitch+7)/8; | |
| 300 break; | |
| 301 case 4: | |
| 302 pitch = (pitch+1)/2; | |
| 303 break; | |
| 304 default: | |
| 305 break; | |
| 306 } | |
| 307 pitch = (pitch + 3) & ~3; /* 4-byte aligning */ | |
| 308 return(pitch); | |
| 309 } | |
| 310 /* | |
| 311 * Match an RGB value to a particular palette index | |
| 312 */ | |
| 313 Uint8 SDL_FindColor(SDL_Palette *pal, Uint8 r, Uint8 g, Uint8 b) | |
| 314 { | |
| 315 /* Do colorspace distance matching */ | |
| 316 unsigned int smallest; | |
| 317 unsigned int distance; | |
| 318 int rd, gd, bd; | |
| 319 int i; | |
| 320 Uint8 pixel=0; | |
| 321 | |
| 322 smallest = ~0; | |
| 323 for ( i=0; i<pal->ncolors; ++i ) { | |
| 324 rd = pal->colors[i].r - r; | |
| 325 gd = pal->colors[i].g - g; | |
| 326 bd = pal->colors[i].b - b; | |
| 327 distance = (rd*rd)+(gd*gd)+(bd*bd); | |
| 328 if ( distance < smallest ) { | |
| 329 pixel = i; | |
| 330 if ( distance == 0 ) { /* Perfect match! */ | |
| 331 break; | |
| 332 } | |
| 333 smallest = distance; | |
| 334 } | |
| 335 } | |
| 336 return(pixel); | |
| 337 } | |
| 338 | |
| 339 /* Find the opaque pixel value corresponding to an RGB triple */ | |
| 340 Uint32 SDL_MapRGB(SDL_PixelFormat *format, Uint8 r, Uint8 g, Uint8 b) | |
| 341 { | |
| 342 if ( format->palette == NULL ) { | |
| 343 return (r >> format->Rloss) << format->Rshift | |
| 344 | (g >> format->Gloss) << format->Gshift | |
| 345 | (b >> format->Bloss) << format->Bshift | |
| 346 | format->Amask; | |
| 347 } else { | |
| 348 return SDL_FindColor(format->palette, r, g, b); | |
| 349 } | |
| 350 } | |
| 351 | |
| 352 /* Find the pixel value corresponding to an RGBA quadruple */ | |
| 353 Uint32 SDL_MapRGBA(SDL_PixelFormat *format, Uint8 r, Uint8 g, Uint8 b, Uint8 a) | |
| 354 { | |
| 355 if ( format->palette == NULL ) { | |
| 356 return (r >> format->Rloss) << format->Rshift | |
| 357 | (g >> format->Gloss) << format->Gshift | |
| 358 | (b >> format->Bloss) << format->Bshift | |
| 359 | ((a >> format->Aloss) << format->Ashift & format->Amask); | |
| 360 } else { | |
| 361 return SDL_FindColor(format->palette, r, g, b); | |
| 362 } | |
| 363 } | |
| 364 | |
| 365 void SDL_GetRGBA(Uint32 pixel, SDL_PixelFormat *fmt, | |
| 366 Uint8 *r, Uint8 *g, Uint8 *b, Uint8 *a) | |
| 367 { | |
| 368 if ( fmt->palette == NULL ) { | |
| 369 /* | |
| 370 * This makes sure that the result is mapped to the | |
| 371 * interval [0..255], and the maximum value for each | |
| 372 * component is 255. This is important to make sure | |
| 373 * that white is indeed reported as (255, 255, 255), | |
| 374 * and that opaque alpha is 255. | |
| 375 * This only works for RGB bit fields at least 4 bit | |
| 376 * wide, which is almost always the case. | |
| 377 */ | |
|
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378 unsigned v; |
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379 v = (pixel & fmt->Rmask) >> fmt->Rshift; |
|
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380 *r = (v << fmt->Rloss) + (v >> (8 - (fmt->Rloss << 1))); |
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381 v = (pixel & fmt->Gmask) >> fmt->Gshift; |
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382 *g = (v << fmt->Gloss) + (v >> (8 - (fmt->Gloss << 1))); |
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383 v = (pixel & fmt->Bmask) >> fmt->Bshift; |
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384 *b = (v << fmt->Bloss) + (v >> (8 - (fmt->Bloss << 1))); |
| 0 | 385 if(fmt->Amask) { |
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386 v = (pixel & fmt->Amask) >> fmt->Ashift; |
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387 *a = (v << fmt->Aloss) + (v >> (8 - (fmt->Aloss << 1))); |
| 695 | 388 } else { |
| 0 | 389 *a = SDL_ALPHA_OPAQUE; |
| 695 | 390 } |
| 0 | 391 } else { |
| 392 *r = fmt->palette->colors[pixel].r; | |
| 393 *g = fmt->palette->colors[pixel].g; | |
| 394 *b = fmt->palette->colors[pixel].b; | |
| 395 *a = SDL_ALPHA_OPAQUE; | |
| 396 } | |
| 397 } | |
| 398 | |
| 399 void SDL_GetRGB(Uint32 pixel, SDL_PixelFormat *fmt, Uint8 *r,Uint8 *g,Uint8 *b) | |
| 400 { | |
| 401 if ( fmt->palette == NULL ) { | |
| 402 /* the note for SDL_GetRGBA above applies here too */ | |
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403 unsigned v; |
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404 v = (pixel & fmt->Rmask) >> fmt->Rshift; |
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405 *r = (v << fmt->Rloss) + (v >> (8 - (fmt->Rloss << 1))); |
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406 v = (pixel & fmt->Gmask) >> fmt->Gshift; |
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407 *g = (v << fmt->Gloss) + (v >> (8 - (fmt->Gloss << 1))); |
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408 v = (pixel & fmt->Bmask) >> fmt->Bshift; |
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409 *b = (v << fmt->Bloss) + (v >> (8 - (fmt->Bloss << 1))); |
| 0 | 410 } else { |
| 411 *r = fmt->palette->colors[pixel].r; | |
| 412 *g = fmt->palette->colors[pixel].g; | |
| 413 *b = fmt->palette->colors[pixel].b; | |
| 414 } | |
| 415 } | |
| 416 | |
| 417 /* Apply gamma to a set of colors - this is easy. :) */ | |
| 418 void SDL_ApplyGamma(Uint16 *gamma, SDL_Color *colors, SDL_Color *output, | |
| 419 int ncolors) | |
| 420 { | |
| 421 int i; | |
| 422 | |
| 423 for ( i=0; i<ncolors; ++i ) { | |
| 424 output[i].r = gamma[0*256 + colors[i].r] >> 8; | |
| 425 output[i].g = gamma[1*256 + colors[i].g] >> 8; | |
| 426 output[i].b = gamma[2*256 + colors[i].b] >> 8; | |
| 427 } | |
| 428 } | |
| 429 | |
| 430 /* Map from Palette to Palette */ | |
| 431 static Uint8 *Map1to1(SDL_Palette *src, SDL_Palette *dst, int *identical) | |
| 432 { | |
| 433 Uint8 *map; | |
| 434 int i; | |
| 435 | |
| 436 if ( identical ) { | |
| 437 if ( src->ncolors <= dst->ncolors ) { | |
| 438 /* If an identical palette, no need to map */ | |
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439 if ( SDL_memcmp(src->colors, dst->colors, src->ncolors* |
| 0 | 440 sizeof(SDL_Color)) == 0 ) { |
| 441 *identical = 1; | |
| 442 return(NULL); | |
| 443 } | |
| 444 } | |
| 445 *identical = 0; | |
| 446 } | |
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447 map = (Uint8 *)SDL_malloc(src->ncolors); |
| 0 | 448 if ( map == NULL ) { |
| 449 SDL_OutOfMemory(); | |
| 450 return(NULL); | |
| 451 } | |
| 452 for ( i=0; i<src->ncolors; ++i ) { | |
| 453 map[i] = SDL_FindColor(dst, | |
| 454 src->colors[i].r, src->colors[i].g, src->colors[i].b); | |
| 455 } | |
| 456 return(map); | |
| 457 } | |
| 458 /* Map from Palette to BitField */ | |
| 459 static Uint8 *Map1toN(SDL_Palette *src, SDL_PixelFormat *dst) | |
| 460 { | |
| 461 Uint8 *map; | |
| 462 int i; | |
| 463 int bpp; | |
| 50 | 464 unsigned alpha; |
| 0 | 465 |
| 466 bpp = ((dst->BytesPerPixel == 3) ? 4 : dst->BytesPerPixel); | |
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467 map = (Uint8 *)SDL_malloc(src->ncolors*bpp); |
| 0 | 468 if ( map == NULL ) { |
| 469 SDL_OutOfMemory(); | |
| 470 return(NULL); | |
| 471 } | |
| 472 | |
| 50 | 473 alpha = dst->Amask ? SDL_ALPHA_OPAQUE : 0; |
| 0 | 474 /* We memory copy to the pixel map so the endianness is preserved */ |
| 475 for ( i=0; i<src->ncolors; ++i ) { | |
| 476 ASSEMBLE_RGBA(&map[i*bpp], dst->BytesPerPixel, dst, | |
| 477 src->colors[i].r, src->colors[i].g, | |
| 50 | 478 src->colors[i].b, alpha); |
| 0 | 479 } |
| 480 return(map); | |
| 481 } | |
| 482 /* Map from BitField to Dithered-Palette to Palette */ | |
| 483 static Uint8 *MapNto1(SDL_PixelFormat *src, SDL_Palette *dst, int *identical) | |
| 484 { | |
| 485 /* Generate a 256 color dither palette */ | |
| 486 SDL_Palette dithered; | |
| 487 SDL_Color colors[256]; | |
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488 |
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489 /* SDL_DitherColors does not initialize the 'unused' component of colors, |
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490 but Map1to1 compares it against dst, so we should initialize it. */ |
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491 SDL_memset(colors, 0, sizeof(colors)); |
| 0 | 492 |
| 493 dithered.ncolors = 256; | |
| 494 SDL_DitherColors(colors, 8); | |
| 495 dithered.colors = colors; | |
| 496 return(Map1to1(&dithered, dst, identical)); | |
| 497 } | |
| 498 | |
| 499 SDL_BlitMap *SDL_AllocBlitMap(void) | |
| 500 { | |
| 501 SDL_BlitMap *map; | |
| 502 | |
| 503 /* Allocate the empty map */ | |
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504 map = (SDL_BlitMap *)SDL_malloc(sizeof(*map)); |
| 0 | 505 if ( map == NULL ) { |
| 506 SDL_OutOfMemory(); | |
| 507 return(NULL); | |
| 508 } | |
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509 SDL_memset(map, 0, sizeof(*map)); |
| 0 | 510 |
| 511 /* Allocate the software blit data */ | |
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512 map->sw_data = (struct private_swaccel *)SDL_malloc(sizeof(*map->sw_data)); |
| 0 | 513 if ( map->sw_data == NULL ) { |
| 514 SDL_FreeBlitMap(map); | |
| 515 SDL_OutOfMemory(); | |
| 516 return(NULL); | |
| 517 } | |
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518 SDL_memset(map->sw_data, 0, sizeof(*map->sw_data)); |
| 0 | 519 |
| 520 /* It's ready to go */ | |
| 521 return(map); | |
| 522 } | |
| 523 void SDL_InvalidateMap(SDL_BlitMap *map) | |
| 524 { | |
| 525 if ( ! map ) { | |
| 526 return; | |
| 527 } | |
| 528 map->dst = NULL; | |
| 529 map->format_version = (unsigned int)-1; | |
| 530 if ( map->table ) { | |
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531 SDL_free(map->table); |
| 0 | 532 map->table = NULL; |
| 533 } | |
| 534 } | |
| 535 int SDL_MapSurface (SDL_Surface *src, SDL_Surface *dst) | |
| 536 { | |
| 537 SDL_PixelFormat *srcfmt; | |
| 538 SDL_PixelFormat *dstfmt; | |
| 539 SDL_BlitMap *map; | |
| 540 | |
| 541 /* Clear out any previous mapping */ | |
| 542 map = src->map; | |
| 543 if ( (src->flags & SDL_RLEACCEL) == SDL_RLEACCEL ) { | |
| 544 SDL_UnRLESurface(src, 1); | |
| 545 } | |
| 546 SDL_InvalidateMap(map); | |
| 547 | |
| 548 /* Figure out what kind of mapping we're doing */ | |
| 549 map->identity = 0; | |
| 550 srcfmt = src->format; | |
| 551 dstfmt = dst->format; | |
| 552 switch (srcfmt->BytesPerPixel) { | |
| 553 case 1: | |
| 554 switch (dstfmt->BytesPerPixel) { | |
| 555 case 1: | |
| 556 /* Palette --> Palette */ | |
| 557 /* If both SDL_HWSURFACE, assume have same palette */ | |
| 558 if ( ((src->flags & SDL_HWSURFACE) == SDL_HWSURFACE) && | |
| 559 ((dst->flags & SDL_HWSURFACE) == SDL_HWSURFACE) ) { | |
| 560 map->identity = 1; | |
| 561 } else { | |
| 562 map->table = Map1to1(srcfmt->palette, | |
| 563 dstfmt->palette, &map->identity); | |
| 564 } | |
| 565 if ( ! map->identity ) { | |
| 566 if ( map->table == NULL ) { | |
| 567 return(-1); | |
| 568 } | |
| 569 } | |
| 570 if (srcfmt->BitsPerPixel!=dstfmt->BitsPerPixel) | |
| 571 map->identity = 0; | |
| 572 break; | |
| 573 | |
| 574 default: | |
| 575 /* Palette --> BitField */ | |
| 576 map->table = Map1toN(srcfmt->palette, dstfmt); | |
| 577 if ( map->table == NULL ) { | |
| 578 return(-1); | |
| 579 } | |
| 580 break; | |
| 581 } | |
| 582 break; | |
| 583 default: | |
| 584 switch (dstfmt->BytesPerPixel) { | |
| 585 case 1: | |
| 586 /* BitField --> Palette */ | |
| 587 map->table = MapNto1(srcfmt, | |
| 588 dstfmt->palette, &map->identity); | |
| 589 if ( ! map->identity ) { | |
| 590 if ( map->table == NULL ) { | |
| 591 return(-1); | |
| 592 } | |
| 593 } | |
| 594 map->identity = 0; /* Don't optimize to copy */ | |
| 595 break; | |
| 596 default: | |
| 597 /* BitField --> BitField */ | |
| 598 if ( FORMAT_EQUAL(srcfmt, dstfmt) ) | |
| 599 map->identity = 1; | |
| 600 break; | |
| 601 } | |
| 602 break; | |
| 603 } | |
| 604 | |
| 605 map->dst = dst; | |
| 606 map->format_version = dst->format_version; | |
| 607 | |
| 608 /* Choose your blitters wisely */ | |
| 609 return(SDL_CalculateBlit(src)); | |
| 610 } | |
| 611 void SDL_FreeBlitMap(SDL_BlitMap *map) | |
| 612 { | |
| 613 if ( map ) { | |
| 614 SDL_InvalidateMap(map); | |
| 615 if ( map->sw_data != NULL ) { | |
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616 SDL_free(map->sw_data); |
| 0 | 617 } |
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618 SDL_free(map); |
| 0 | 619 } |
| 620 } |