1 /* Copyright (C)2004 Landmark Graphics Corporation 2 * Copyright (C)2005 Sun Microsystems, Inc. 3 * Copyright (C)2009 D. R. Commander 4 * 5 * This library is free software and may be redistributed and/or modified under 6 * the terms of the wxWindows Library License, Version 3.1 or (at your option) 7 * any later version. The full license is in the LICENSE.txt file included 8 * with this distribution. 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 13 * wxWindows Library License for more details. 14 */ 15 16 // This implements a JPEG compressor/decompressor using the libjpeg API 17 18 #include <stdio.h> 19 #include <stdlib.h> 20 #include <string.h> 21 #include <jpeglib.h> 22 #include <jerror.h> 23 #include <setjmp.h> 24 #include "./turbojpeg.h" 25 26 27 // Error handling 28 29 static char lasterror[JMSG_LENGTH_MAX]="No error"; 30 31 typedef struct _error_mgr 32 { 33 struct jpeg_error_mgr pub; 34 jmp_buf jb; 35 } error_mgr; 36 37 static void my_error_exit(j_common_ptr cinfo) 38 { 39 error_mgr *myerr = (error_mgr *)cinfo->err; 40 (*cinfo->err->output_message)(cinfo); 41 longjmp(myerr->jb, 1); 42 } 43 44 static void my_output_message(j_common_ptr cinfo) 45 { 46 (*cinfo->err->format_message)(cinfo, lasterror); 47 } 48 49 50 // Global structures, macros, etc. 51 52 typedef struct _jpgstruct 53 { 54 struct jpeg_compress_struct cinfo; 55 struct jpeg_decompress_struct dinfo; 56 struct jpeg_destination_mgr jdms; 57 struct jpeg_source_mgr jsms; 58 error_mgr jerr; 59 int initc, initd; 60 } jpgstruct; 61 62 static const int hsampfactor[NUMSUBOPT]={1, 2, 2, 1}; 63 static const int vsampfactor[NUMSUBOPT]={1, 1, 2, 1}; 64 65 #define _throw(c) {sprintf(lasterror, "%s", c); return -1;} 66 #define _catch(f) {if((f)==-1) return -1;} 67 #define checkhandle(h) jpgstruct *j=(jpgstruct *)h; \ 68 if(!j) _throw("Invalid handle"); 69 70 71 // CO 72 73 static boolean empty_output_buffer(struct jpeg_compress_struct *cinfo) 74 { 75 ERREXIT(cinfo, JERR_BUFFER_SIZE); 76 return TRUE; 77 } 78 79 static void destination_noop(struct jpeg_compress_struct *cinfo) 80 { 81 } 82 83 DLLEXPORT tjhandle DLLCALL tjInitCompress(void) 84 { 85 jpgstruct *j=NULL; 86 if((j=(jpgstruct *)malloc(sizeof(jpgstruct)))==NULL) 87 {sprintf(lasterror, "Memory allocation failure"); return NULL;} 88 memset(j, 0, sizeof(jpgstruct)); 89 j->cinfo.err=jpeg_std_error(&j->jerr.pub); 90 j->jerr.pub.error_exit=my_error_exit; 91 j->jerr.pub.output_message=my_output_message; 92 93 if(setjmp(j->jerr.jb)) 94 { // this will execute if LIBJPEG has an error 95 if(j) free(j); return NULL; 96 } 97 98 jpeg_create_compress(&j->cinfo); 99 j->cinfo.dest=&j->jdms; 100 j->jdms.init_destination=destination_noop; 101 j->jdms.empty_output_buffer=empty_output_buffer; 102 j->jdms.term_destination=destination_noop; 103 104 j->initc=1; 105 return (tjhandle)j; 106 } 107 108 DLLEXPORT unsigned long DLLCALL TJBUFSIZE(int width, int height) 109 { 110 // This allows enough room in case the image doesn't compress 111 return ((width+15)&(~15)) * ((height+15)&(~15)) * 6 + 2048; 112 } 113 114 DLLEXPORT int DLLCALL tjCompress(tjhandle h, 115 unsigned char *srcbuf, int width, int pitch, int height, int ps, 116 unsigned char *dstbuf, unsigned long *size, 117 int jpegsub, int qual, int flags) 118 { 119 int i; JSAMPROW *row_pointer=NULL; 120 121 checkhandle(h); 122 123 if(srcbuf==NULL || width<=0 || pitch<0 || height<=0 124 || dstbuf==NULL || size==NULL 125 || jpegsub<0 || jpegsub>=NUMSUBOPT || qual<0 || qual>100) 126 _throw("Invalid argument in tjCompress()"); 127 if(ps!=3 && ps!=4) _throw("This compressor can only take 24-bit or 32-bit RGB input"); 128 if(!j->initc) _throw("Instance has not been initialized for compression"); 129 130 if(pitch==0) pitch=width*ps; 131 132 j->cinfo.image_width = width; 133 j->cinfo.image_height = height; 134 j->cinfo.input_components = ps; 135 136 #if JCS_EXTENSIONS==1 137 j->cinfo.in_color_space = JCS_EXT_RGB; 138 if(ps==3 && (flags&TJ_BGR)) 139 j->cinfo.in_color_space = JCS_EXT_BGR; 140 else if(ps==4 && !(flags&TJ_BGR) && !(flags&TJ_ALPHAFIRST)) 141 j->cinfo.in_color_space = JCS_EXT_RGBX; 142 else if(ps==4 && (flags&TJ_BGR) && !(flags&TJ_ALPHAFIRST)) 143 j->cinfo.in_color_space = JCS_EXT_BGRX; 144 else if(ps==4 && (flags&TJ_BGR) && (flags&TJ_ALPHAFIRST)) 145 j->cinfo.in_color_space = JCS_EXT_XBGR; 146 else if(ps==4 && !(flags&TJ_BGR) && (flags&TJ_ALPHAFIRST)) 147 j->cinfo.in_color_space = JCS_EXT_XRGB; 148 #else 149 #error "TurboJPEG requires JPEG colorspace extensions" 150 #endif 151 152 if(flags&TJ_FORCEMMX) putenv("JSIMD_FORCEMMX=1"); 153 else if(flags&TJ_FORCESSE) putenv("JSIMD_FORCESSE=1"); 154 else if(flags&TJ_FORCESSE2) putenv("JSIMD_FORCESSE2=1"); 155 156 if(setjmp(j->jerr.jb)) 157 { // this will execute if LIBJPEG has an error 158 if(row_pointer) free(row_pointer); 159 return -1; 160 } 161 162 jpeg_set_defaults(&j->cinfo); 163 164 jpeg_set_quality(&j->cinfo, qual, TRUE); 165 if(jpegsub==TJ_GRAYSCALE) 166 jpeg_set_colorspace(&j->cinfo, JCS_GRAYSCALE); 167 else 168 jpeg_set_colorspace(&j->cinfo, JCS_YCbCr); 169 j->cinfo.dct_method = JDCT_FASTEST; 170 171 j->cinfo.comp_info[0].h_samp_factor=hsampfactor[jpegsub]; 172 j->cinfo.comp_info[1].h_samp_factor=1; 173 j->cinfo.comp_info[2].h_samp_factor=1; 174 j->cinfo.comp_info[0].v_samp_factor=vsampfactor[jpegsub]; 175 j->cinfo.comp_info[1].v_samp_factor=1; 176 j->cinfo.comp_info[2].v_samp_factor=1; 177 178 j->jdms.next_output_byte = dstbuf; 179 j->jdms.free_in_buffer = TJBUFSIZE(j->cinfo.image_width, j->cinfo.image_height); 180 181 if((row_pointer=(JSAMPROW *)malloc(sizeof(JSAMPROW)*height))==NULL) 182 _throw("Memory allocation failed in tjInitCompress()"); 183 for(i=0; i<height; i++) 184 { 185 if(flags&TJ_BOTTOMUP) row_pointer[i]= &srcbuf[(height-i-1)*pitch]; 186 else row_pointer[i]= &srcbuf[i*pitch]; 187 } 188 jpeg_start_compress(&j->cinfo, TRUE); 189 while(j->cinfo.next_scanline<j->cinfo.image_height) 190 { 191 jpeg_write_scanlines(&j->cinfo, &row_pointer[j->cinfo.next_scanline], 192 j->cinfo.image_height-j->cinfo.next_scanline); 193 } 194 jpeg_finish_compress(&j->cinfo); 195 *size=TJBUFSIZE(j->cinfo.image_width, j->cinfo.image_height) 196 -(unsigned long)(j->jdms.free_in_buffer); 197 198 if(row_pointer) free(row_pointer); 199 return 0; 200 } 201 202 203 // DEC 204 205 static boolean fill_input_buffer (struct jpeg_decompress_struct *dinfo) 206 { 207 ERREXIT(dinfo, JERR_BUFFER_SIZE); 208 return TRUE; 209 } 210 211 static void skip_input_data (struct jpeg_decompress_struct *dinfo, long num_bytes) 212 { 213 dinfo->src->next_input_byte += (size_t) num_bytes; 214 dinfo->src->bytes_in_buffer -= (size_t) num_bytes; 215 } 216 217 static void source_noop (struct jpeg_decompress_struct *dinfo) 218 { 219 } 220 221 DLLEXPORT tjhandle DLLCALL tjInitDecompress(void) 222 { 223 jpgstruct *j; 224 if((j=(jpgstruct *)malloc(sizeof(jpgstruct)))==NULL) 225 {sprintf(lasterror, "Memory allocation failure"); return NULL;} 226 memset(j, 0, sizeof(jpgstruct)); 227 j->dinfo.err=jpeg_std_error(&j->jerr.pub); 228 j->jerr.pub.error_exit=my_error_exit; 229 j->jerr.pub.output_message=my_output_message; 230 231 if(setjmp(j->jerr.jb)) 232 { // this will execute if LIBJPEG has an error 233 free(j); return NULL; 234 } 235 236 jpeg_create_decompress(&j->dinfo); 237 j->dinfo.src=&j->jsms; 238 j->jsms.init_source=source_noop; 239 j->jsms.fill_input_buffer = fill_input_buffer; 240 j->jsms.skip_input_data = skip_input_data; 241 j->jsms.resync_to_restart = jpeg_resync_to_restart; 242 j->jsms.term_source = source_noop; 243 244 j->initd=1; 245 return (tjhandle)j; 246 } 247 248 249 DLLEXPORT int DLLCALL tjDecompressHeader(tjhandle h, 250 unsigned char *srcbuf, unsigned long size, 251 int *width, int *height) 252 { 253 checkhandle(h); 254 255 if(srcbuf==NULL || size<=0 || width==NULL || height==NULL) 256 _throw("Invalid argument in tjDecompressHeader()"); 257 if(!j->initd) _throw("Instance has not been initialized for decompression"); 258 259 if(setjmp(j->jerr.jb)) 260 { // this will execute if LIBJPEG has an error 261 return -1; 262 } 263 264 j->jsms.bytes_in_buffer = size; 265 j->jsms.next_input_byte = srcbuf; 266 267 jpeg_read_header(&j->dinfo, TRUE); 268 269 *width=j->dinfo.image_width; *height=j->dinfo.image_height; 270 271 jpeg_abort_decompress(&j->dinfo); 272 273 if(*width<1 || *height<1) _throw("Invalid data returned in header"); 274 return 0; 275 } 276 277 278 DLLEXPORT int DLLCALL tjDecompress(tjhandle h, 279 unsigned char *srcbuf, unsigned long size, 280 unsigned char *dstbuf, int width, int pitch, int height, int ps, 281 int flags) 282 { 283 int i; JSAMPROW *row_pointer=NULL; 284 285 checkhandle(h); 286 287 if(srcbuf==NULL || size<=0 288 || dstbuf==NULL || width<=0 || pitch<0 || height<=0) 289 _throw("Invalid argument in tjDecompress()"); 290 if(ps!=3 && ps!=4) _throw("This compressor can only take 24-bit or 32-bit RGB input"); 291 if(!j->initd) _throw("Instance has not been initialized for decompression"); 292 293 if(pitch==0) pitch=width*ps; 294 295 if(flags&TJ_FORCEMMX) putenv("JSIMD_FORCEMMX=1"); 296 else if(flags&TJ_FORCESSE) putenv("JSIMD_FORCESSE=1"); 297 else if(flags&TJ_FORCESSE2) putenv("JSIMD_FORCESSE2=1"); 298 299 if(setjmp(j->jerr.jb)) 300 { // this will execute if LIBJPEG has an error 301 if(row_pointer) free(row_pointer); 302 return -1; 303 } 304 305 j->jsms.bytes_in_buffer = size; 306 j->jsms.next_input_byte = srcbuf; 307 308 jpeg_read_header(&j->dinfo, TRUE); 309 310 if((row_pointer=(JSAMPROW *)malloc(sizeof(JSAMPROW)*height))==NULL) 311 _throw("Memory allocation failed in tjInitDecompress()"); 312 for(i=0; i<height; i++) 313 { 314 if(flags&TJ_BOTTOMUP) row_pointer[i]= &dstbuf[(height-i-1)*pitch]; 315 else row_pointer[i]= &dstbuf[i*pitch]; 316 } 317 318 #if JCS_EXTENSIONS==1 319 j->dinfo.out_color_space = JCS_EXT_RGB; 320 if(ps==3 && (flags&TJ_BGR)) 321 j->dinfo.out_color_space = JCS_EXT_BGR; 322 else if(ps==4 && !(flags&TJ_BGR) && !(flags&TJ_ALPHAFIRST)) 323 j->dinfo.out_color_space = JCS_EXT_RGBX; 324 else if(ps==4 && (flags&TJ_BGR) && !(flags&TJ_ALPHAFIRST)) 325 j->dinfo.out_color_space = JCS_EXT_BGRX; 326 else if(ps==4 && (flags&TJ_BGR) && (flags&TJ_ALPHAFIRST)) 327 j->dinfo.out_color_space = JCS_EXT_XBGR; 328 else if(ps==4 && !(flags&TJ_BGR) && (flags&TJ_ALPHAFIRST)) 329 j->dinfo.out_color_space = JCS_EXT_XRGB; 330 #else 331 #error "TurboJPEG requires JPEG colorspace extensions" 332 #endif 333 if(flags&TJ_FASTUPSAMPLE) j->dinfo.do_fancy_upsampling=FALSE; 334 335 jpeg_start_decompress(&j->dinfo); 336 while(j->dinfo.output_scanline<j->dinfo.output_height) 337 { 338 jpeg_read_scanlines(&j->dinfo, &row_pointer[j->dinfo.output_scanline], 339 j->dinfo.output_height-j->dinfo.output_scanline); 340 } 341 jpeg_finish_decompress(&j->dinfo); 342 343 if(row_pointer) free(row_pointer); 344 return 0; 345 } 346 347 348 // General 349 350 DLLEXPORT char* DLLCALL tjGetErrorStr(void) 351 { 352 return lasterror; 353 } 354 355 DLLEXPORT int DLLCALL tjDestroy(tjhandle h) 356 { 357 checkhandle(h); 358 if(setjmp(j->jerr.jb)) return -1; 359 if(j->initc) jpeg_destroy_compress(&j->cinfo); 360 if(j->initd) jpeg_destroy_decompress(&j->dinfo); 361 free(j); 362 return 0; 363 } 364
