Mercurial > sdl-ios-xcode
annotate src/video/SDL_blit.c @ 944:cdea7cbc3e23
Date: Wed, 28 Jul 2004 14:56:57 +0800
From: Aaron Perez
Subject: [SDL] Fwd: SDL not checking malloc returning NULL
I was reading through the code and i found that in several places does a
malloc and without checking if it is NULL just use the pointer.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Sat, 21 Aug 2004 13:10:58 +0000 |
| parents | 9301b429c99f |
| children | 68f607298ca9 |
| 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(char* to,char* 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(char* to,char* 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 } | |
| 283 | |
| 284 /* Get the blit function index, based on surface mode */ | |
| 285 /* { 0 = nothing, 1 = colorkey, 2 = alpha, 3 = colorkey+alpha } */ | |
| 286 blit_index = 0; | |
| 287 blit_index |= (!!(surface->flags & SDL_SRCCOLORKEY)) << 0; | |
| 288 if ( surface->flags & SDL_SRCALPHA | |
| 289 && (surface->format->alpha != SDL_ALPHA_OPAQUE | |
| 290 || surface->format->Amask) ) { | |
| 291 blit_index |= 2; | |
| 292 } | |
| 293 | |
| 294 /* Check for special "identity" case -- copy blit */ | |
| 295 if ( surface->map->identity && blit_index == 0 ) { | |
| 296 surface->map->sw_data->blit = SDL_BlitCopy; | |
| 297 | |
| 298 /* Handle overlapping blits on the same surface */ | |
| 299 if ( surface == surface->map->dst ) { | |
| 300 surface->map->sw_data->blit = SDL_BlitCopyOverlap; | |
| 301 } | |
| 302 } else { | |
| 303 if ( surface->format->BitsPerPixel < 8 ) { | |
| 304 surface->map->sw_data->blit = | |
| 305 SDL_CalculateBlit0(surface, blit_index); | |
| 306 } else { | |
| 307 switch ( surface->format->BytesPerPixel ) { | |
| 308 case 1: | |
| 309 surface->map->sw_data->blit = | |
| 310 SDL_CalculateBlit1(surface, blit_index); | |
| 311 break; | |
| 312 case 2: | |
| 313 case 3: | |
| 314 case 4: | |
| 315 surface->map->sw_data->blit = | |
| 316 SDL_CalculateBlitN(surface, blit_index); | |
| 317 break; | |
| 318 default: | |
| 319 surface->map->sw_data->blit = NULL; | |
| 320 break; | |
| 321 } | |
| 322 } | |
| 323 } | |
| 324 /* Make sure we have a blit function */ | |
| 325 if ( surface->map->sw_data->blit == NULL ) { | |
| 326 SDL_InvalidateMap(surface->map); | |
| 327 SDL_SetError("Blit combination not supported"); | |
| 328 return(-1); | |
| 329 } | |
| 330 | |
| 331 /* Choose software blitting function */ | |
| 332 if(surface->flags & SDL_RLEACCELOK | |
| 333 && (surface->flags & SDL_HWACCEL) != SDL_HWACCEL) { | |
| 334 | |
| 335 if(surface->map->identity | |
| 336 && (blit_index == 1 | |
| 337 || (blit_index == 3 && !surface->format->Amask))) { | |
| 338 if ( SDL_RLESurface(surface) == 0 ) | |
| 339 surface->map->sw_blit = SDL_RLEBlit; | |
| 340 } else if(blit_index == 2 && surface->format->Amask) { | |
| 341 if ( SDL_RLESurface(surface) == 0 ) | |
| 342 surface->map->sw_blit = SDL_RLEAlphaBlit; | |
| 343 } | |
| 344 } | |
| 345 | |
| 346 if ( surface->map->sw_blit == NULL ) { | |
| 347 surface->map->sw_blit = SDL_SoftBlit; | |
| 348 } | |
| 349 return(0); | |
| 350 } | |
| 351 |