Mercurial > sdl-ios-xcode
annotate src/video/SDL_blit.c @ 1240:3b8a43c428bb
From Bug #36:
There are a couple of issues with the selection of Altivec alpha-blitting
routines in CalculateAlphaBlit() in src/video/SDL_Blit_A.c.
1) There's no check for the presence of Altivec when checking if the
Blit32to565PixelAlphaAltivec() routine can be selected.
2) Altivec cannot be used in video memory, and there's no check if the
destination surface is a hardware surface. (Alpha-blitting to a hardware
surface with GPU support is a bad idea, but somebody's bound to do it anyway.)
Patch to fix these attached.
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Sun, 08 Jan 2006 21:18:15 +0000 |
| parents | b81f54c3963f |
| children | c9b51268668f |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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Updated copyright information for 2004 (Happy New Year!)
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3 Copyright (C) 1997-2004 Sam Lantinga |
| 0 | 4 |
| 5 This library is free software; you can redistribute it and/or | |
| 6 modify it under the terms of the GNU Library General Public | |
| 7 License as published by the Free Software Foundation; either | |
| 8 version 2 of the License, or (at your option) any later version. | |
| 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 | |
| 13 Library General Public License for more details. | |
| 14 | |
| 15 You should have received a copy of the GNU Library General Public | |
| 16 License along with this library; if not, write to the Free | |
| 17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| 18 | |
| 19 Sam Lantinga | |
|
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20 slouken@libsdl.org |
| 0 | 21 */ |
| 22 | |
| 23 #ifdef SAVE_RCSID | |
| 24 static char rcsid = | |
| 25 "@(#) $Id$"; | |
| 26 #endif | |
| 27 | |
| 28 #include <stdio.h> | |
| 29 #include <stdlib.h> | |
| 30 #include <string.h> | |
| 31 | |
| 32 #include "SDL_error.h" | |
| 33 #include "SDL_video.h" | |
| 34 #include "SDL_sysvideo.h" | |
| 35 #include "SDL_blit.h" | |
| 36 #include "SDL_RLEaccel_c.h" | |
| 37 #include "SDL_pixels_c.h" | |
| 38 #include "SDL_memops.h" | |
| 39 | |
|
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40 #if (defined(i386) || defined(__x86_64__)) && defined(__GNUC__) && defined(USE_ASMBLIT) |
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41 #define MMX_ASMBLIT |
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42 #endif |
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43 |
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44 #if defined(MMX_ASMBLIT) |
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45 #include "SDL_cpuinfo.h" |
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46 #include "mmx.h" |
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47 #endif |
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48 |
| 0 | 49 /* The general purpose software blit routine */ |
| 50 static int SDL_SoftBlit(SDL_Surface *src, SDL_Rect *srcrect, | |
| 51 SDL_Surface *dst, SDL_Rect *dstrect) | |
| 52 { | |
| 53 int okay; | |
| 54 int src_locked; | |
| 55 int dst_locked; | |
| 56 | |
| 57 /* Everything is okay at the beginning... */ | |
| 58 okay = 1; | |
| 59 | |
| 60 /* Lock the destination if it's in hardware */ | |
| 61 dst_locked = 0; | |
|
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62 if ( SDL_MUSTLOCK(dst) ) { |
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63 if ( SDL_LockSurface(dst) < 0 ) { |
| 0 | 64 okay = 0; |
| 65 } else { | |
| 66 dst_locked = 1; | |
| 67 } | |
| 68 } | |
| 69 /* Lock the source if it's in hardware */ | |
| 70 src_locked = 0; | |
|
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71 if ( SDL_MUSTLOCK(src) ) { |
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72 if ( SDL_LockSurface(src) < 0 ) { |
| 0 | 73 okay = 0; |
| 74 } else { | |
| 75 src_locked = 1; | |
| 76 } | |
| 77 } | |
| 78 | |
| 79 /* Set up source and destination buffer pointers, and BLIT! */ | |
| 80 if ( okay && srcrect->w && srcrect->h ) { | |
| 81 SDL_BlitInfo info; | |
| 82 SDL_loblit RunBlit; | |
| 83 | |
| 84 /* Set up the blit information */ | |
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85 info.s_pixels = (Uint8 *)src->pixels + |
| 0 | 86 (Uint16)srcrect->y*src->pitch + |
| 87 (Uint16)srcrect->x*src->format->BytesPerPixel; | |
| 88 info.s_width = srcrect->w; | |
| 89 info.s_height = srcrect->h; | |
| 90 info.s_skip=src->pitch-info.s_width*src->format->BytesPerPixel; | |
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91 info.d_pixels = (Uint8 *)dst->pixels + |
| 0 | 92 (Uint16)dstrect->y*dst->pitch + |
| 93 (Uint16)dstrect->x*dst->format->BytesPerPixel; | |
| 94 info.d_width = dstrect->w; | |
| 95 info.d_height = dstrect->h; | |
| 96 info.d_skip=dst->pitch-info.d_width*dst->format->BytesPerPixel; | |
| 97 info.aux_data = src->map->sw_data->aux_data; | |
| 98 info.src = src->format; | |
| 99 info.table = src->map->table; | |
| 100 info.dst = dst->format; | |
| 101 RunBlit = src->map->sw_data->blit; | |
| 102 | |
| 103 /* Run the actual software blit */ | |
| 104 RunBlit(&info); | |
| 105 } | |
| 106 | |
| 107 /* We need to unlock the surfaces if they're locked */ | |
| 108 if ( dst_locked ) { | |
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109 SDL_UnlockSurface(dst); |
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110 } |
| 0 | 111 if ( src_locked ) { |
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112 SDL_UnlockSurface(src); |
| 0 | 113 } |
| 114 /* Blit is done! */ | |
| 115 return(okay ? 0 : -1); | |
| 116 } | |
| 117 | |
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118 #ifdef MMX_ASMBLIT |
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119 static __inline__ void SDL_memcpyMMX(Uint8 *to, const Uint8 *from, int len) |
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120 { |
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121 int i; |
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122 |
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123 for(i=0; i<len/8; i++) { |
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124 __asm__ __volatile__ ( |
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125 " movq (%0), %%mm0\n" |
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126 " movq %%mm0, (%1)\n" |
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127 : : "r" (from), "r" (to) : "memory"); |
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128 from+=8; |
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129 to+=8; |
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130 } |
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131 if (len&7) |
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132 SDL_memcpy(to, from, len&7); |
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133 } |
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134 |
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135 static __inline__ void SDL_memcpySSE(Uint8 *to, const Uint8 *from, int len) |
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136 { |
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137 int i; |
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138 |
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139 __asm__ __volatile__ ( |
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140 " prefetchnta (%0)\n" |
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141 " prefetchnta 64(%0)\n" |
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142 " prefetchnta 128(%0)\n" |
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143 " prefetchnta 192(%0)\n" |
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144 : : "r" (from) ); |
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145 |
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146 for(i=0; i<len/8; i++) { |
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147 __asm__ __volatile__ ( |
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148 " prefetchnta 256(%0)\n" |
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149 " movq (%0), %%mm0\n" |
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150 " movntq %%mm0, (%1)\n" |
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151 : : "r" (from), "r" (to) : "memory"); |
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152 from+=8; |
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153 to+=8; |
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154 } |
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155 if (len&7) |
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156 SDL_memcpy(to, from, len&7); |
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157 } |
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158 #endif |
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159 |
| 0 | 160 static void SDL_BlitCopy(SDL_BlitInfo *info) |
| 161 { | |
| 162 Uint8 *src, *dst; | |
| 163 int w, h; | |
| 164 int srcskip, dstskip; | |
| 165 | |
| 166 w = info->d_width*info->dst->BytesPerPixel; | |
| 167 h = info->d_height; | |
| 168 src = info->s_pixels; | |
| 169 dst = info->d_pixels; | |
| 170 srcskip = w+info->s_skip; | |
| 171 dstskip = w+info->d_skip; | |
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172 #ifdef MMX_ASMBLIT |
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173 if(SDL_HasSSE()) |
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174 { |
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175 while ( h-- ) { |
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176 SDL_memcpySSE(dst, src, w); |
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177 src += srcskip; |
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178 dst += dstskip; |
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179 } |
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180 __asm__ __volatile__ ( |
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181 " emms\n" |
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182 ::); |
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183 } |
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184 else |
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185 if(SDL_HasMMX()) |
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186 { |
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187 while ( h-- ) { |
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188 SDL_memcpyMMX(dst, src, w); |
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189 src += srcskip; |
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190 dst += dstskip; |
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191 } |
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192 __asm__ __volatile__ ( |
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193 " emms\n" |
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194 ::); |
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195 } |
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196 else |
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197 #endif |
| 0 | 198 while ( h-- ) { |
| 199 SDL_memcpy(dst, src, w); | |
| 200 src += srcskip; | |
| 201 dst += dstskip; | |
| 202 } | |
| 203 } | |
| 204 | |
| 205 static void SDL_BlitCopyOverlap(SDL_BlitInfo *info) | |
| 206 { | |
| 207 Uint8 *src, *dst; | |
| 208 int w, h; | |
| 209 int srcskip, dstskip; | |
| 210 | |
| 211 w = info->d_width*info->dst->BytesPerPixel; | |
| 212 h = info->d_height; | |
| 213 src = info->s_pixels; | |
| 214 dst = info->d_pixels; | |
| 215 srcskip = w+info->s_skip; | |
| 216 dstskip = w+info->d_skip; | |
| 217 if ( dst < src ) { | |
| 218 while ( h-- ) { | |
| 219 SDL_memcpy(dst, src, w); | |
| 220 src += srcskip; | |
| 221 dst += dstskip; | |
| 222 } | |
| 223 } else { | |
| 224 src += ((h-1) * srcskip); | |
| 225 dst += ((h-1) * dstskip); | |
| 226 while ( h-- ) { | |
| 227 SDL_revcpy(dst, src, w); | |
| 228 src -= srcskip; | |
| 229 dst -= dstskip; | |
| 230 } | |
| 231 } | |
| 232 } | |
| 233 | |
| 234 /* Figure out which of many blit routines to set up on a surface */ | |
| 235 int SDL_CalculateBlit(SDL_Surface *surface) | |
| 236 { | |
| 237 int blit_index; | |
| 238 | |
| 239 /* Clean everything out to start */ | |
| 240 if ( (surface->flags & SDL_RLEACCEL) == SDL_RLEACCEL ) { | |
| 241 SDL_UnRLESurface(surface, 1); | |
| 242 } | |
| 243 surface->map->sw_blit = NULL; | |
| 244 | |
| 245 /* Figure out if an accelerated hardware blit is possible */ | |
| 246 surface->flags &= ~SDL_HWACCEL; | |
| 247 if ( surface->map->identity ) { | |
| 248 int hw_blit_ok; | |
| 249 | |
| 250 if ( (surface->flags & SDL_HWSURFACE) == SDL_HWSURFACE ) { | |
| 251 /* We only support accelerated blitting to hardware */ | |
| 252 if ( surface->map->dst->flags & SDL_HWSURFACE ) { | |
| 253 hw_blit_ok = current_video->info.blit_hw; | |
| 254 } else { | |
| 255 hw_blit_ok = 0; | |
| 256 } | |
| 257 if (hw_blit_ok && (surface->flags & SDL_SRCCOLORKEY)) { | |
| 258 hw_blit_ok = current_video->info.blit_hw_CC; | |
| 259 } | |
| 260 if ( hw_blit_ok && (surface->flags & SDL_SRCALPHA) ) { | |
| 261 hw_blit_ok = current_video->info.blit_hw_A; | |
| 262 } | |
| 263 } else { | |
| 264 /* We only support accelerated blitting to hardware */ | |
| 265 if ( surface->map->dst->flags & SDL_HWSURFACE ) { | |
| 266 hw_blit_ok = current_video->info.blit_sw; | |
| 267 } else { | |
| 268 hw_blit_ok = 0; | |
| 269 } | |
| 270 if (hw_blit_ok && (surface->flags & SDL_SRCCOLORKEY)) { | |
| 271 hw_blit_ok = current_video->info.blit_sw_CC; | |
| 272 } | |
| 273 if ( hw_blit_ok && (surface->flags & SDL_SRCALPHA) ) { | |
| 274 hw_blit_ok = current_video->info.blit_sw_A; | |
| 275 } | |
| 276 } | |
| 277 if ( hw_blit_ok ) { | |
| 278 SDL_VideoDevice *video = current_video; | |
| 279 SDL_VideoDevice *this = current_video; | |
| 280 video->CheckHWBlit(this, surface, surface->map->dst); | |
| 281 } | |
| 282 } | |
|
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283 |
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284 /* if an alpha pixel format is specified, we can accelerate alpha blits */ |
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285 if (((surface->flags & SDL_HWSURFACE) == SDL_HWSURFACE )&&(current_video->displayformatalphapixel)) |
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286 { |
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287 if ( (surface->flags & SDL_SRCALPHA) ) |
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288 if ( current_video->info.blit_hw_A ) { |
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289 SDL_VideoDevice *video = current_video; |
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290 SDL_VideoDevice *this = current_video; |
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291 video->CheckHWBlit(this, surface, surface->map->dst); |
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292 } |
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293 } |
| 0 | 294 |
| 295 /* Get the blit function index, based on surface mode */ | |
| 296 /* { 0 = nothing, 1 = colorkey, 2 = alpha, 3 = colorkey+alpha } */ | |
| 297 blit_index = 0; | |
| 298 blit_index |= (!!(surface->flags & SDL_SRCCOLORKEY)) << 0; | |
| 299 if ( surface->flags & SDL_SRCALPHA | |
| 300 && (surface->format->alpha != SDL_ALPHA_OPAQUE | |
| 301 || surface->format->Amask) ) { | |
| 302 blit_index |= 2; | |
| 303 } | |
| 304 | |
| 305 /* Check for special "identity" case -- copy blit */ | |
| 306 if ( surface->map->identity && blit_index == 0 ) { | |
| 307 surface->map->sw_data->blit = SDL_BlitCopy; | |
| 308 | |
| 309 /* Handle overlapping blits on the same surface */ | |
| 310 if ( surface == surface->map->dst ) { | |
| 311 surface->map->sw_data->blit = SDL_BlitCopyOverlap; | |
| 312 } | |
| 313 } else { | |
| 314 if ( surface->format->BitsPerPixel < 8 ) { | |
| 315 surface->map->sw_data->blit = | |
| 316 SDL_CalculateBlit0(surface, blit_index); | |
| 317 } else { | |
| 318 switch ( surface->format->BytesPerPixel ) { | |
| 319 case 1: | |
| 320 surface->map->sw_data->blit = | |
| 321 SDL_CalculateBlit1(surface, blit_index); | |
| 322 break; | |
| 323 case 2: | |
| 324 case 3: | |
| 325 case 4: | |
| 326 surface->map->sw_data->blit = | |
| 327 SDL_CalculateBlitN(surface, blit_index); | |
| 328 break; | |
| 329 default: | |
| 330 surface->map->sw_data->blit = NULL; | |
| 331 break; | |
| 332 } | |
| 333 } | |
| 334 } | |
| 335 /* Make sure we have a blit function */ | |
| 336 if ( surface->map->sw_data->blit == NULL ) { | |
| 337 SDL_InvalidateMap(surface->map); | |
| 338 SDL_SetError("Blit combination not supported"); | |
| 339 return(-1); | |
| 340 } | |
| 341 | |
| 342 /* Choose software blitting function */ | |
| 343 if(surface->flags & SDL_RLEACCELOK | |
| 344 && (surface->flags & SDL_HWACCEL) != SDL_HWACCEL) { | |
| 345 | |
| 346 if(surface->map->identity | |
| 347 && (blit_index == 1 | |
| 348 || (blit_index == 3 && !surface->format->Amask))) { | |
| 349 if ( SDL_RLESurface(surface) == 0 ) | |
| 350 surface->map->sw_blit = SDL_RLEBlit; | |
| 351 } else if(blit_index == 2 && surface->format->Amask) { | |
| 352 if ( SDL_RLESurface(surface) == 0 ) | |
| 353 surface->map->sw_blit = SDL_RLEAlphaBlit; | |
| 354 } | |
| 355 } | |
| 356 | |
| 357 if ( surface->map->sw_blit == NULL ) { | |
| 358 surface->map->sw_blit = SDL_SoftBlit; | |
| 359 } | |
| 360 return(0); | |
| 361 } | |
| 362 |