San Mehat | a430b2b | 2014-09-23 08:30:51 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C)2009-2012 D. R. Commander. All Rights Reserved. |
| 3 | * |
| 4 | * Redistribution and use in source and binary forms, with or without |
| 5 | * modification, are permitted provided that the following conditions are met: |
| 6 | * |
| 7 | * - Redistributions of source code must retain the above copyright notice, |
| 8 | * this list of conditions and the following disclaimer. |
| 9 | * - Redistributions in binary form must reproduce the above copyright notice, |
| 10 | * this list of conditions and the following disclaimer in the documentation |
| 11 | * and/or other materials provided with the distribution. |
| 12 | * - Neither the name of the libjpeg-turbo Project nor the names of its |
| 13 | * contributors may be used to endorse or promote products derived from this |
| 14 | * software without specific prior written permission. |
| 15 | * |
| 16 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS", |
| 17 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 18 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 19 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE |
| 20 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 21 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 22 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 23 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| 24 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 25 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| 26 | * POSSIBILITY OF SUCH DAMAGE. |
| 27 | */ |
| 28 | |
| 29 | /* TurboJPEG/OSS: this implements the TurboJPEG API using libjpeg-turbo */ |
| 30 | |
| 31 | #include <stdio.h> |
| 32 | #include <stdlib.h> |
| 33 | #include <string.h> |
| 34 | #ifndef JCS_EXTENSIONS |
| 35 | #define JPEG_INTERNAL_OPTIONS |
| 36 | #endif |
| 37 | #include <jpeglib.h> |
| 38 | #include <jerror.h> |
| 39 | #include <setjmp.h> |
| 40 | #include "./turbojpeg.h" |
| 41 | |
| 42 | #define PAD(v, p) ((v+(p)-1)&(~((p)-1))) |
| 43 | |
| 44 | #define CSTATE_START 100 |
| 45 | #define DSTATE_START 200 |
| 46 | #define MEMZERO(ptr, size) memset(ptr, 0, size) |
| 47 | |
| 48 | #ifndef min |
| 49 | #define min(a,b) ((a)<(b)?(a):(b)) |
| 50 | #endif |
| 51 | |
| 52 | #ifndef max |
| 53 | #define max(a,b) ((a)>(b)?(a):(b)) |
| 54 | #endif |
| 55 | |
| 56 | |
| 57 | /* Error handling (based on example in example.c) */ |
| 58 | |
| 59 | static char errStr[JMSG_LENGTH_MAX]="No error"; |
| 60 | |
| 61 | struct my_error_mgr |
| 62 | { |
| 63 | struct jpeg_error_mgr pub; |
| 64 | jmp_buf setjmp_buffer; |
| 65 | }; |
| 66 | typedef struct my_error_mgr *my_error_ptr; |
| 67 | |
| 68 | static void my_error_exit(j_common_ptr cinfo) |
| 69 | { |
| 70 | my_error_ptr myerr=(my_error_ptr)cinfo->err; |
| 71 | (*cinfo->err->output_message)(cinfo); |
| 72 | longjmp(myerr->setjmp_buffer, 1); |
| 73 | } |
| 74 | |
| 75 | /* Based on output_message() in jerror.c */ |
| 76 | |
| 77 | static void my_output_message(j_common_ptr cinfo) |
| 78 | { |
| 79 | (*cinfo->err->format_message)(cinfo, errStr); |
| 80 | } |
| 81 | |
| 82 | |
| 83 | /* Global structures, macros, etc. */ |
| 84 | |
| 85 | enum {COMPRESS=1, DECOMPRESS=2}; |
| 86 | |
| 87 | typedef struct _tjinstance |
| 88 | { |
| 89 | struct jpeg_compress_struct cinfo; |
| 90 | struct jpeg_decompress_struct dinfo; |
| 91 | struct jpeg_destination_mgr jdst; |
| 92 | struct jpeg_source_mgr jsrc; |
| 93 | struct my_error_mgr jerr; |
| 94 | int init; |
| 95 | } tjinstance; |
| 96 | |
| 97 | static const int pixelsize[TJ_NUMSAMP]={3, 3, 3, 1, 3}; |
| 98 | |
| 99 | #define NUMSF 4 |
| 100 | static const tjscalingfactor sf[NUMSF]={ |
| 101 | {1, 1}, |
| 102 | {1, 2}, |
| 103 | {1, 4}, |
| 104 | {1, 8} |
| 105 | }; |
| 106 | |
| 107 | #define _throw(m) {snprintf(errStr, JMSG_LENGTH_MAX, "%s", m); \ |
| 108 | retval=-1; goto bailout;} |
| 109 | #define getinstance(handle) tjinstance *this=(tjinstance *)handle; \ |
| 110 | j_compress_ptr cinfo=NULL; j_decompress_ptr dinfo=NULL; \ |
| 111 | (void) cinfo; (void) dinfo; /* silence warnings */ \ |
| 112 | if(!this) {snprintf(errStr, JMSG_LENGTH_MAX, "Invalid handle"); \ |
| 113 | return -1;} \ |
| 114 | cinfo=&this->cinfo; dinfo=&this->dinfo; |
| 115 | |
| 116 | static int getPixelFormat(int pixelSize, int flags) |
| 117 | { |
| 118 | if(pixelSize==1) return TJPF_GRAY; |
| 119 | if(pixelSize==3) |
| 120 | { |
| 121 | if(flags&TJ_BGR) return TJPF_BGR; |
| 122 | else return TJPF_RGB; |
| 123 | } |
| 124 | if(pixelSize==4) |
| 125 | { |
| 126 | if(flags&TJ_ALPHAFIRST) |
| 127 | { |
| 128 | if(flags&TJ_BGR) return TJPF_XBGR; |
| 129 | else return TJPF_XRGB; |
| 130 | } |
| 131 | else |
| 132 | { |
| 133 | if(flags&TJ_BGR) return TJPF_BGRX; |
| 134 | else return TJPF_RGBX; |
| 135 | } |
| 136 | } |
| 137 | return -1; |
| 138 | } |
| 139 | |
| 140 | static int setCompDefaults(struct jpeg_compress_struct *cinfo, |
| 141 | int pixelFormat, int subsamp, int jpegQual) |
| 142 | { |
| 143 | int retval=0; |
| 144 | |
| 145 | switch(pixelFormat) |
| 146 | { |
| 147 | case TJPF_GRAY: |
| 148 | cinfo->in_color_space=JCS_GRAYSCALE; break; |
| 149 | #if JCS_EXTENSIONS==1 |
| 150 | case TJPF_RGB: |
| 151 | cinfo->in_color_space=JCS_EXT_RGB; break; |
| 152 | case TJPF_BGR: |
| 153 | cinfo->in_color_space=JCS_EXT_BGR; break; |
| 154 | case TJPF_RGBX: |
| 155 | case TJPF_RGBA: |
| 156 | cinfo->in_color_space=JCS_EXT_RGBX; break; |
| 157 | case TJPF_BGRX: |
| 158 | case TJPF_BGRA: |
| 159 | cinfo->in_color_space=JCS_EXT_BGRX; break; |
| 160 | case TJPF_XRGB: |
| 161 | case TJPF_ARGB: |
| 162 | cinfo->in_color_space=JCS_EXT_XRGB; break; |
| 163 | case TJPF_XBGR: |
| 164 | case TJPF_ABGR: |
| 165 | cinfo->in_color_space=JCS_EXT_XBGR; break; |
| 166 | #else |
| 167 | case TJPF_RGB: |
| 168 | case TJPF_BGR: |
| 169 | case TJPF_RGBX: |
| 170 | case TJPF_BGRX: |
| 171 | case TJPF_XRGB: |
| 172 | case TJPF_XBGR: |
| 173 | case TJPF_RGBA: |
| 174 | case TJPF_BGRA: |
| 175 | case TJPF_ARGB: |
| 176 | case TJPF_ABGR: |
| 177 | cinfo->in_color_space=JCS_RGB; pixelFormat=TJPF_RGB; |
| 178 | break; |
| 179 | #endif |
| 180 | } |
| 181 | |
| 182 | cinfo->input_components=tjPixelSize[pixelFormat]; |
| 183 | jpeg_set_defaults(cinfo); |
| 184 | if(jpegQual>=0) |
| 185 | { |
| 186 | jpeg_set_quality(cinfo, jpegQual, TRUE); |
| 187 | if(jpegQual>=96) cinfo->dct_method=JDCT_ISLOW; |
| 188 | else cinfo->dct_method=JDCT_FASTEST; |
| 189 | } |
| 190 | if(subsamp==TJSAMP_GRAY) |
| 191 | jpeg_set_colorspace(cinfo, JCS_GRAYSCALE); |
| 192 | else |
| 193 | jpeg_set_colorspace(cinfo, JCS_YCbCr); |
| 194 | |
| 195 | cinfo->comp_info[0].h_samp_factor=tjMCUWidth[subsamp]/8; |
| 196 | cinfo->comp_info[1].h_samp_factor=1; |
| 197 | cinfo->comp_info[2].h_samp_factor=1; |
| 198 | cinfo->comp_info[0].v_samp_factor=tjMCUHeight[subsamp]/8; |
| 199 | cinfo->comp_info[1].v_samp_factor=1; |
| 200 | cinfo->comp_info[2].v_samp_factor=1; |
| 201 | |
| 202 | return retval; |
| 203 | } |
| 204 | |
| 205 | static int setDecompDefaults(struct jpeg_decompress_struct *dinfo, |
| 206 | int pixelFormat) |
| 207 | { |
| 208 | int retval=0; |
| 209 | |
| 210 | switch(pixelFormat) |
| 211 | { |
| 212 | case TJPF_GRAY: |
| 213 | dinfo->out_color_space=JCS_GRAYSCALE; break; |
| 214 | #if JCS_EXTENSIONS==1 |
| 215 | case TJPF_RGB: |
| 216 | dinfo->out_color_space=JCS_EXT_RGB; break; |
| 217 | case TJPF_BGR: |
| 218 | dinfo->out_color_space=JCS_EXT_BGR; break; |
| 219 | case TJPF_RGBX: |
| 220 | dinfo->out_color_space=JCS_EXT_RGBX; break; |
| 221 | case TJPF_BGRX: |
| 222 | dinfo->out_color_space=JCS_EXT_BGRX; break; |
| 223 | case TJPF_XRGB: |
| 224 | dinfo->out_color_space=JCS_EXT_XRGB; break; |
| 225 | case TJPF_XBGR: |
| 226 | dinfo->out_color_space=JCS_EXT_XBGR; break; |
| 227 | #if JCS_ALPHA_EXTENSIONS==1 |
| 228 | case TJPF_RGBA: |
| 229 | dinfo->out_color_space=JCS_EXT_RGBA; break; |
| 230 | case TJPF_BGRA: |
| 231 | dinfo->out_color_space=JCS_EXT_BGRA; break; |
| 232 | case TJPF_ARGB: |
| 233 | dinfo->out_color_space=JCS_EXT_ARGB; break; |
| 234 | case TJPF_ABGR: |
| 235 | dinfo->out_color_space=JCS_EXT_ABGR; break; |
| 236 | #endif |
| 237 | #else |
| 238 | case TJPF_RGB: |
| 239 | case TJPF_BGR: |
| 240 | case TJPF_RGBX: |
| 241 | case TJPF_BGRX: |
| 242 | case TJPF_XRGB: |
| 243 | case TJPF_XBGR: |
| 244 | case TJPF_RGBA: |
| 245 | case TJPF_BGRA: |
| 246 | case TJPF_ARGB: |
| 247 | case TJPF_ABGR: |
| 248 | dinfo->out_color_space=JCS_RGB; break; |
| 249 | #endif |
| 250 | default: |
| 251 | _throw("Unsupported pixel format"); |
| 252 | } |
| 253 | |
| 254 | bailout: |
| 255 | return retval; |
| 256 | } |
| 257 | |
| 258 | |
| 259 | static int getSubsamp(j_decompress_ptr dinfo) |
| 260 | { |
| 261 | int retval=-1, i, k; |
| 262 | for(i=0; i<NUMSUBOPT; i++) |
| 263 | { |
| 264 | if(dinfo->num_components==pixelsize[i]) |
| 265 | { |
| 266 | if(dinfo->comp_info[0].h_samp_factor==tjMCUWidth[i]/8 |
| 267 | && dinfo->comp_info[0].v_samp_factor==tjMCUHeight[i]/8) |
| 268 | { |
| 269 | int match=0; |
| 270 | for(k=1; k<dinfo->num_components; k++) |
| 271 | { |
| 272 | if(dinfo->comp_info[k].h_samp_factor==1 |
| 273 | && dinfo->comp_info[k].v_samp_factor==1) |
| 274 | match++; |
| 275 | } |
| 276 | if(match==dinfo->num_components-1) |
| 277 | { |
| 278 | retval=i; break; |
| 279 | } |
| 280 | } |
| 281 | } |
| 282 | } |
| 283 | return retval; |
| 284 | } |
| 285 | |
| 286 | |
| 287 | #ifndef JCS_EXTENSIONS |
| 288 | |
| 289 | /* Conversion functions to emulate the colorspace extensions. This allows the |
| 290 | TurboJPEG wrapper to be used with libjpeg */ |
| 291 | |
| 292 | #define TORGB(PS, ROFFSET, GOFFSET, BOFFSET) { \ |
| 293 | int rowPad=pitch-width*PS; \ |
| 294 | while(height--) \ |
| 295 | { \ |
| 296 | unsigned char *endOfRow=src+width*PS; \ |
| 297 | while(src<endOfRow) \ |
| 298 | { \ |
| 299 | dst[RGB_RED]=src[ROFFSET]; \ |
| 300 | dst[RGB_GREEN]=src[GOFFSET]; \ |
| 301 | dst[RGB_BLUE]=src[BOFFSET]; \ |
| 302 | dst+=RGB_PIXELSIZE; src+=PS; \ |
| 303 | } \ |
| 304 | src+=rowPad; \ |
| 305 | } \ |
| 306 | } |
| 307 | |
| 308 | static unsigned char *toRGB(unsigned char *src, int width, int pitch, |
| 309 | int height, int pixelFormat, unsigned char *dst) |
| 310 | { |
| 311 | unsigned char *retval=src; |
| 312 | switch(pixelFormat) |
| 313 | { |
| 314 | case TJPF_RGB: |
| 315 | #if RGB_RED!=0 || RGB_GREEN!=1 || RGB_BLUE!=2 || RGB_PIXELSIZE!=3 |
| 316 | retval=dst; TORGB(3, 0, 1, 2); |
| 317 | #endif |
| 318 | break; |
| 319 | case TJPF_BGR: |
| 320 | #if RGB_RED!=2 || RGB_GREEN!=1 || RGB_BLUE!=0 || RGB_PIXELSIZE!=3 |
| 321 | retval=dst; TORGB(3, 2, 1, 0); |
| 322 | #endif |
| 323 | break; |
| 324 | case TJPF_RGBX: |
| 325 | case TJPF_RGBA: |
| 326 | #if RGB_RED!=0 || RGB_GREEN!=1 || RGB_BLUE!=2 || RGB_PIXELSIZE!=4 |
| 327 | retval=dst; TORGB(4, 0, 1, 2); |
| 328 | #endif |
| 329 | break; |
| 330 | case TJPF_BGRX: |
| 331 | case TJPF_BGRA: |
| 332 | #if RGB_RED!=2 || RGB_GREEN!=1 || RGB_BLUE!=0 || RGB_PIXELSIZE!=4 |
| 333 | retval=dst; TORGB(4, 2, 1, 0); |
| 334 | #endif |
| 335 | break; |
| 336 | case TJPF_XRGB: |
| 337 | case TJPF_ARGB: |
| 338 | #if RGB_RED!=1 || RGB_GREEN!=2 || RGB_BLUE!=3 || RGB_PIXELSIZE!=4 |
| 339 | retval=dst; TORGB(4, 1, 2, 3); |
| 340 | #endif |
| 341 | break; |
| 342 | case TJPF_XBGR: |
| 343 | case TJPF_ABGR: |
| 344 | #if RGB_RED!=3 || RGB_GREEN!=2 || RGB_BLUE!=1 || RGB_PIXELSIZE!=4 |
| 345 | retval=dst; TORGB(4, 3, 2, 1); |
| 346 | #endif |
| 347 | break; |
| 348 | } |
| 349 | return retval; |
| 350 | } |
| 351 | |
| 352 | #define FROMRGB(PS, ROFFSET, GOFFSET, BOFFSET, SETALPHA) { \ |
| 353 | int rowPad=pitch-width*PS; \ |
| 354 | while(height--) \ |
| 355 | { \ |
| 356 | unsigned char *endOfRow=dst+width*PS; \ |
| 357 | while(dst<endOfRow) \ |
| 358 | { \ |
| 359 | dst[ROFFSET]=src[RGB_RED]; \ |
| 360 | dst[GOFFSET]=src[RGB_GREEN]; \ |
| 361 | dst[BOFFSET]=src[RGB_BLUE]; \ |
| 362 | SETALPHA \ |
| 363 | dst+=PS; src+=RGB_PIXELSIZE; \ |
| 364 | } \ |
| 365 | dst+=rowPad; \ |
| 366 | } \ |
| 367 | } |
| 368 | |
| 369 | static void fromRGB(unsigned char *src, unsigned char *dst, int width, |
| 370 | int pitch, int height, int pixelFormat) |
| 371 | { |
| 372 | switch(pixelFormat) |
| 373 | { |
| 374 | case TJPF_RGB: |
| 375 | #if RGB_RED!=0 || RGB_GREEN!=1 || RGB_BLUE!=2 || RGB_PIXELSIZE!=3 |
| 376 | FROMRGB(3, 0, 1, 2,); |
| 377 | #endif |
| 378 | break; |
| 379 | case TJPF_BGR: |
| 380 | #if RGB_RED!=2 || RGB_GREEN!=1 || RGB_BLUE!=0 || RGB_PIXELSIZE!=3 |
| 381 | FROMRGB(3, 2, 1, 0,); |
| 382 | #endif |
| 383 | break; |
| 384 | case TJPF_RGBX: |
| 385 | #if RGB_RED!=0 || RGB_GREEN!=1 || RGB_BLUE!=2 || RGB_PIXELSIZE!=4 |
| 386 | FROMRGB(4, 0, 1, 2,); |
| 387 | #endif |
| 388 | break; |
| 389 | case TJPF_RGBA: |
| 390 | #if RGB_RED!=0 || RGB_GREEN!=1 || RGB_BLUE!=2 || RGB_PIXELSIZE!=4 |
| 391 | FROMRGB(4, 0, 1, 2, dst[3]=0xFF;); |
| 392 | #endif |
| 393 | break; |
| 394 | case TJPF_BGRX: |
| 395 | #if RGB_RED!=2 || RGB_GREEN!=1 || RGB_BLUE!=0 || RGB_PIXELSIZE!=4 |
| 396 | FROMRGB(4, 2, 1, 0,); |
| 397 | #endif |
| 398 | break; |
| 399 | case TJPF_BGRA: |
| 400 | #if RGB_RED!=2 || RGB_GREEN!=1 || RGB_BLUE!=0 || RGB_PIXELSIZE!=4 |
| 401 | FROMRGB(4, 2, 1, 0, dst[3]=0xFF;); return; |
| 402 | #endif |
| 403 | break; |
| 404 | case TJPF_XRGB: |
| 405 | #if RGB_RED!=1 || RGB_GREEN!=2 || RGB_BLUE!=3 || RGB_PIXELSIZE!=4 |
| 406 | FROMRGB(4, 1, 2, 3,); return; |
| 407 | #endif |
| 408 | break; |
| 409 | case TJPF_ARGB: |
| 410 | #if RGB_RED!=1 || RGB_GREEN!=2 || RGB_BLUE!=3 || RGB_PIXELSIZE!=4 |
| 411 | FROMRGB(4, 1, 2, 3, dst[0]=0xFF;); return; |
| 412 | #endif |
| 413 | break; |
| 414 | case TJPF_XBGR: |
| 415 | #if RGB_RED!=3 || RGB_GREEN!=2 || RGB_BLUE!=1 || RGB_PIXELSIZE!=4 |
| 416 | FROMRGB(4, 3, 2, 1,); return; |
| 417 | #endif |
| 418 | break; |
| 419 | case TJPF_ABGR: |
| 420 | #if RGB_RED!=3 || RGB_GREEN!=2 || RGB_BLUE!=1 || RGB_PIXELSIZE!=4 |
| 421 | FROMRGB(4, 3, 2, 1, dst[0]=0xFF;); return; |
| 422 | #endif |
| 423 | break; |
| 424 | } |
| 425 | } |
| 426 | |
| 427 | #endif |
| 428 | |
| 429 | |
| 430 | /* General API functions */ |
| 431 | |
| 432 | DLLEXPORT char* DLLCALL tjGetErrorStr(void) |
| 433 | { |
| 434 | return errStr; |
| 435 | } |
| 436 | |
| 437 | |
| 438 | DLLEXPORT int DLLCALL tjDestroy(tjhandle handle) |
| 439 | { |
| 440 | getinstance(handle); |
| 441 | if(setjmp(this->jerr.setjmp_buffer)) return -1; |
| 442 | if(this->init&COMPRESS) jpeg_destroy_compress(cinfo); |
| 443 | if(this->init&DECOMPRESS) jpeg_destroy_decompress(dinfo); |
| 444 | free(this); |
| 445 | return 0; |
| 446 | } |
| 447 | |
| 448 | |
| 449 | /* Compressor */ |
| 450 | |
| 451 | static boolean empty_output_buffer(j_compress_ptr cinfo) |
| 452 | { |
| 453 | ERREXIT(cinfo, JERR_BUFFER_SIZE); |
| 454 | return TRUE; |
| 455 | } |
| 456 | |
| 457 | static void dst_noop(j_compress_ptr cinfo) |
| 458 | { |
| 459 | } |
| 460 | |
| 461 | static tjhandle _tjInitCompress(tjinstance *this) |
| 462 | { |
| 463 | /* This is also straight out of example.c */ |
| 464 | this->cinfo.err=jpeg_std_error(&this->jerr.pub); |
| 465 | this->jerr.pub.error_exit=my_error_exit; |
| 466 | this->jerr.pub.output_message=my_output_message; |
| 467 | |
| 468 | if(setjmp(this->jerr.setjmp_buffer)) |
| 469 | { |
| 470 | /* If we get here, the JPEG code has signaled an error. */ |
| 471 | if(this) free(this); return NULL; |
| 472 | } |
| 473 | |
| 474 | jpeg_create_compress(&this->cinfo); |
| 475 | this->cinfo.dest=&this->jdst; |
| 476 | this->jdst.init_destination=dst_noop; |
| 477 | this->jdst.empty_output_buffer=empty_output_buffer; |
| 478 | this->jdst.term_destination=dst_noop; |
| 479 | |
| 480 | this->init|=COMPRESS; |
| 481 | return (tjhandle)this; |
| 482 | } |
| 483 | |
| 484 | DLLEXPORT tjhandle DLLCALL tjInitCompress(void) |
| 485 | { |
| 486 | tjinstance *this=NULL; |
| 487 | if((this=(tjinstance *)malloc(sizeof(tjinstance)))==NULL) |
| 488 | { |
| 489 | snprintf(errStr, JMSG_LENGTH_MAX, |
| 490 | "tjInitCompress(): Memory allocation failure"); |
| 491 | return NULL; |
| 492 | } |
| 493 | MEMZERO(this, sizeof(tjinstance)); |
| 494 | return _tjInitCompress(this); |
| 495 | } |
| 496 | |
| 497 | |
| 498 | DLLEXPORT unsigned long DLLCALL tjBufSize(int width, int height, |
| 499 | int jpegSubsamp) |
| 500 | { |
| 501 | unsigned long retval=0; int mcuw, mcuh, chromasf; |
| 502 | if(width<1 || height<1 || jpegSubsamp<0 || jpegSubsamp>=NUMSUBOPT) |
| 503 | _throw("tjBufSize(): Invalid argument"); |
| 504 | |
| 505 | // This allows for rare corner cases in which a JPEG image can actually be |
| 506 | // larger than the uncompressed input (we wouldn't mention it if it hadn't |
| 507 | // happened before.) |
| 508 | mcuw=tjMCUWidth[jpegSubsamp]; |
| 509 | mcuh=tjMCUHeight[jpegSubsamp]; |
| 510 | chromasf=jpegSubsamp==TJSAMP_GRAY? 0: 4*64/(mcuw*mcuh); |
| 511 | retval=PAD(width, mcuw) * PAD(height, mcuh) * (2 + chromasf) + 2048; |
| 512 | |
| 513 | bailout: |
| 514 | return retval; |
| 515 | } |
| 516 | |
| 517 | |
| 518 | DLLEXPORT unsigned long DLLCALL TJBUFSIZE(int width, int height) |
| 519 | { |
| 520 | unsigned long retval=0; |
| 521 | if(width<1 || height<1) |
| 522 | _throw("TJBUFSIZE(): Invalid argument"); |
| 523 | |
| 524 | // This allows for rare corner cases in which a JPEG image can actually be |
| 525 | // larger than the uncompressed input (we wouldn't mention it if it hadn't |
| 526 | // happened before.) |
| 527 | retval=PAD(width, 16) * PAD(height, 16) * 6 + 2048; |
| 528 | |
| 529 | bailout: |
| 530 | return retval; |
| 531 | } |
| 532 | |
| 533 | |
| 534 | DLLEXPORT int DLLCALL tjCompress2(tjhandle handle, unsigned char *srcBuf, |
| 535 | int width, int pitch, int height, int pixelFormat, unsigned char **jpegBuf, |
| 536 | unsigned long *jpegSize, int jpegSubsamp, int jpegQual, int flags) |
| 537 | { |
| 538 | int i, retval=0; JSAMPROW *row_pointer=NULL; |
| 539 | #ifndef JCS_EXTENSIONS |
| 540 | unsigned char *rgbBuf=NULL; |
| 541 | #endif |
| 542 | |
| 543 | getinstance(handle) |
| 544 | if((this->init&COMPRESS)==0) |
| 545 | _throw("tjCompress2(): Instance has not been initialized for compression"); |
| 546 | |
| 547 | if(srcBuf==NULL || width<=0 || pitch<0 || height<=0 || pixelFormat<0 |
| 548 | || pixelFormat>=TJ_NUMPF || jpegBuf==NULL || jpegSize==NULL |
| 549 | || jpegSubsamp<0 || jpegSubsamp>=NUMSUBOPT || jpegQual<0 || jpegQual>100) |
| 550 | _throw("tjCompress2(): Invalid argument"); |
| 551 | |
| 552 | if(setjmp(this->jerr.setjmp_buffer)) |
| 553 | { |
| 554 | /* If we get here, the JPEG code has signaled an error. */ |
| 555 | retval=-1; |
| 556 | goto bailout; |
| 557 | } |
| 558 | |
| 559 | if(pitch==0) pitch=width*tjPixelSize[pixelFormat]; |
| 560 | |
| 561 | #ifndef JCS_EXTENSIONS |
| 562 | if(pixelFormat!=TJPF_GRAY) |
| 563 | { |
| 564 | rgbBuf=(unsigned char *)malloc(width*height*RGB_PIXELSIZE); |
| 565 | if(!rgbBuf) _throw("tjCompress2(): Memory allocation failure"); |
| 566 | srcBuf=toRGB(srcBuf, width, pitch, height, pixelFormat, rgbBuf); |
| 567 | pitch=width*RGB_PIXELSIZE; |
| 568 | } |
| 569 | #endif |
| 570 | |
| 571 | cinfo->image_width=width; |
| 572 | cinfo->image_height=height; |
| 573 | |
| 574 | if(flags&TJFLAG_FORCEMMX) putenv("JSIMD_FORCEMMX=1"); |
| 575 | else if(flags&TJFLAG_FORCESSE) putenv("JSIMD_FORCESSE=1"); |
| 576 | else if(flags&TJFLAG_FORCESSE2) putenv("JSIMD_FORCESSE2=1"); |
| 577 | |
| 578 | if(setCompDefaults(cinfo, pixelFormat, jpegSubsamp, jpegQual)==-1) |
| 579 | return -1; |
| 580 | |
| 581 | this->jdst.next_output_byte=*jpegBuf; |
| 582 | this->jdst.free_in_buffer=tjBufSize(width, height, jpegSubsamp); |
| 583 | |
| 584 | jpeg_start_compress(cinfo, TRUE); |
| 585 | if((row_pointer=(JSAMPROW *)malloc(sizeof(JSAMPROW)*height))==NULL) |
| 586 | _throw("tjCompress2(): Memory allocation failure"); |
| 587 | for(i=0; i<height; i++) |
| 588 | { |
| 589 | if(flags&TJFLAG_BOTTOMUP) row_pointer[i]=&srcBuf[(height-i-1)*pitch]; |
| 590 | else row_pointer[i]=&srcBuf[i*pitch]; |
| 591 | } |
| 592 | while(cinfo->next_scanline<cinfo->image_height) |
| 593 | { |
| 594 | jpeg_write_scanlines(cinfo, &row_pointer[cinfo->next_scanline], |
| 595 | cinfo->image_height-cinfo->next_scanline); |
| 596 | } |
| 597 | jpeg_finish_compress(cinfo); |
| 598 | *jpegSize=tjBufSize(width, height, jpegSubsamp) |
| 599 | -(unsigned long)(this->jdst.free_in_buffer); |
| 600 | |
| 601 | bailout: |
| 602 | if(cinfo->global_state>CSTATE_START) jpeg_abort_compress(cinfo); |
| 603 | #ifndef JCS_EXTENSIONS |
| 604 | if(rgbBuf) free(rgbBuf); |
| 605 | #endif |
| 606 | if(row_pointer) free(row_pointer); |
| 607 | return retval; |
| 608 | } |
| 609 | |
| 610 | DLLEXPORT int DLLCALL tjCompress(tjhandle handle, unsigned char *srcBuf, |
| 611 | int width, int pitch, int height, int pixelSize, unsigned char *jpegBuf, |
| 612 | unsigned long *jpegSize, int jpegSubsamp, int jpegQual, int flags) |
| 613 | { |
| 614 | int retval=0; unsigned long size; |
| 615 | retval=tjCompress2(handle, srcBuf, width, pitch, height, |
| 616 | getPixelFormat(pixelSize, flags), &jpegBuf, &size, jpegSubsamp, jpegQual, |
| 617 | flags); |
| 618 | *jpegSize=size; |
| 619 | return retval; |
| 620 | } |
| 621 | |
| 622 | |
| 623 | /* Decompressor */ |
| 624 | |
| 625 | static boolean fill_input_buffer(j_decompress_ptr dinfo) |
| 626 | { |
| 627 | ERREXIT(dinfo, JERR_BUFFER_SIZE); |
| 628 | return TRUE; |
| 629 | } |
| 630 | |
| 631 | static void skip_input_data(j_decompress_ptr dinfo, long num_bytes) |
| 632 | { |
| 633 | dinfo->src->next_input_byte += (size_t) num_bytes; |
| 634 | dinfo->src->bytes_in_buffer -= (size_t) num_bytes; |
| 635 | } |
| 636 | |
| 637 | static void src_noop(j_decompress_ptr dinfo) |
| 638 | { |
| 639 | } |
| 640 | |
| 641 | static tjhandle _tjInitDecompress(tjinstance *this) |
| 642 | { |
| 643 | /* This is also straight out of example.c */ |
| 644 | this->dinfo.err=jpeg_std_error(&this->jerr.pub); |
| 645 | this->jerr.pub.error_exit=my_error_exit; |
| 646 | this->jerr.pub.output_message=my_output_message; |
| 647 | |
| 648 | if(setjmp(this->jerr.setjmp_buffer)) |
| 649 | { |
| 650 | /* If we get here, the JPEG code has signaled an error. */ |
| 651 | if(this) free(this); return NULL; |
| 652 | } |
| 653 | |
| 654 | jpeg_create_decompress(&this->dinfo); |
| 655 | this->dinfo.src=&this->jsrc; |
| 656 | this->jsrc.init_source=src_noop; |
| 657 | this->jsrc.fill_input_buffer=fill_input_buffer; |
| 658 | this->jsrc.skip_input_data=skip_input_data; |
| 659 | this->jsrc.resync_to_restart=jpeg_resync_to_restart; |
| 660 | this->jsrc.term_source=src_noop; |
| 661 | |
| 662 | this->init|=DECOMPRESS; |
| 663 | return (tjhandle)this; |
| 664 | } |
| 665 | |
| 666 | DLLEXPORT tjhandle DLLCALL tjInitDecompress(void) |
| 667 | { |
| 668 | tjinstance *this; |
| 669 | if((this=(tjinstance *)malloc(sizeof(tjinstance)))==NULL) |
| 670 | { |
| 671 | snprintf(errStr, JMSG_LENGTH_MAX, |
| 672 | "tjInitDecompress(): Memory allocation failure"); |
| 673 | return NULL; |
| 674 | } |
| 675 | MEMZERO(this, sizeof(tjinstance)); |
| 676 | return _tjInitDecompress(this); |
| 677 | } |
| 678 | |
| 679 | |
| 680 | DLLEXPORT int DLLCALL tjDecompressHeader2(tjhandle handle, |
| 681 | unsigned char *jpegBuf, unsigned long jpegSize, int *width, int *height, |
| 682 | int *jpegSubsamp) |
| 683 | { |
| 684 | int retval=0; |
| 685 | |
| 686 | getinstance(handle); |
| 687 | if((this->init&DECOMPRESS)==0) |
| 688 | _throw("tjDecompressHeader2(): Instance has not been initialized for decompression"); |
| 689 | |
| 690 | if(jpegBuf==NULL || jpegSize<=0 || width==NULL || height==NULL |
| 691 | || jpegSubsamp==NULL) |
| 692 | _throw("tjDecompressHeader2(): Invalid argument"); |
| 693 | |
| 694 | if(setjmp(this->jerr.setjmp_buffer)) |
| 695 | { |
| 696 | /* If we get here, the JPEG code has signaled an error. */ |
| 697 | return -1; |
| 698 | } |
| 699 | |
| 700 | this->jsrc.bytes_in_buffer=jpegSize; |
| 701 | this->jsrc.next_input_byte=jpegBuf; |
| 702 | jpeg_read_header(dinfo, TRUE); |
| 703 | |
| 704 | *width=dinfo->image_width; |
| 705 | *height=dinfo->image_height; |
| 706 | *jpegSubsamp=getSubsamp(dinfo); |
| 707 | |
| 708 | jpeg_abort_decompress(dinfo); |
| 709 | |
| 710 | if(*jpegSubsamp<0) |
| 711 | _throw("tjDecompressHeader2(): Could not determine subsampling type for JPEG image"); |
| 712 | if(*width<1 || *height<1) |
| 713 | _throw("tjDecompressHeader2(): Invalid data returned in header"); |
| 714 | |
| 715 | bailout: |
| 716 | return retval; |
| 717 | } |
| 718 | |
| 719 | DLLEXPORT int DLLCALL tjDecompressHeader(tjhandle handle, |
| 720 | unsigned char *jpegBuf, unsigned long jpegSize, int *width, int *height) |
| 721 | { |
| 722 | int jpegSubsamp; |
| 723 | return tjDecompressHeader2(handle, jpegBuf, jpegSize, width, height, |
| 724 | &jpegSubsamp); |
| 725 | } |
| 726 | |
| 727 | |
| 728 | DLLEXPORT tjscalingfactor* DLLCALL tjGetScalingFactors(int *numscalingfactors) |
| 729 | { |
| 730 | if(numscalingfactors==NULL) |
| 731 | { |
| 732 | snprintf(errStr, JMSG_LENGTH_MAX, |
| 733 | "tjGetScalingFactors(): Invalid argument"); |
| 734 | return NULL; |
| 735 | } |
| 736 | |
| 737 | *numscalingfactors=NUMSF; |
| 738 | return (tjscalingfactor *)sf; |
| 739 | } |
| 740 | |
| 741 | |
| 742 | DLLEXPORT int DLLCALL tjDecompress2(tjhandle handle, unsigned char *jpegBuf, |
| 743 | unsigned long jpegSize, unsigned char *dstBuf, int width, int pitch, |
| 744 | int height, int pixelFormat, int flags) |
| 745 | { |
| 746 | int i, retval=0; JSAMPROW *row_pointer=NULL; |
| 747 | int jpegwidth, jpegheight, scaledw, scaledh; |
| 748 | #ifndef JCS_EXTENSIONS |
| 749 | unsigned char *rgbBuf=NULL; |
| 750 | unsigned char *_dstBuf=NULL; int _pitch=0; |
| 751 | #endif |
| 752 | |
| 753 | getinstance(handle); |
| 754 | if((this->init&DECOMPRESS)==0) |
| 755 | _throw("tjDecompress2(): Instance has not been initialized for decompression"); |
| 756 | |
| 757 | if(jpegBuf==NULL || jpegSize<=0 || dstBuf==NULL || width<0 || pitch<0 |
| 758 | || height<0 || pixelFormat<0 || pixelFormat>=TJ_NUMPF) |
| 759 | _throw("tjDecompress2(): Invalid argument"); |
| 760 | |
| 761 | if(flags&TJFLAG_FORCEMMX) putenv("JSIMD_FORCEMMX=1"); |
| 762 | else if(flags&TJFLAG_FORCESSE) putenv("JSIMD_FORCESSE=1"); |
| 763 | else if(flags&TJFLAG_FORCESSE2) putenv("JSIMD_FORCESSE2=1"); |
| 764 | |
| 765 | if(setjmp(this->jerr.setjmp_buffer)) |
| 766 | { |
| 767 | /* If we get here, the JPEG code has signaled an error. */ |
| 768 | retval=-1; |
| 769 | goto bailout; |
| 770 | } |
| 771 | |
| 772 | this->jsrc.bytes_in_buffer=jpegSize; |
| 773 | this->jsrc.next_input_byte=jpegBuf; |
| 774 | jpeg_read_header(dinfo, TRUE); |
| 775 | if(setDecompDefaults(dinfo, pixelFormat)==-1) |
| 776 | { |
| 777 | retval=-1; goto bailout; |
| 778 | } |
| 779 | |
| 780 | if(flags&TJFLAG_FASTUPSAMPLE) dinfo->do_fancy_upsampling=FALSE; |
| 781 | |
| 782 | jpegwidth=dinfo->image_width; jpegheight=dinfo->image_height; |
| 783 | if(width==0) width=jpegwidth; |
| 784 | if(height==0) height=jpegheight; |
| 785 | for(i=0; i<NUMSF; i++) |
| 786 | { |
| 787 | scaledw=TJSCALED(jpegwidth, sf[i]); |
| 788 | scaledh=TJSCALED(jpegheight, sf[i]); |
| 789 | if(scaledw<=width && scaledh<=height) |
| 790 | break; |
| 791 | } |
| 792 | if(scaledw>width || scaledh>height) |
| 793 | _throw("tjDecompress2(): Could not scale down to desired image dimensions"); |
| 794 | width=scaledw; height=scaledh; |
| 795 | dinfo->scale_num=sf[i].num; |
| 796 | dinfo->scale_denom=sf[i].denom; |
| 797 | |
| 798 | jpeg_start_decompress(dinfo); |
| 799 | if(pitch==0) pitch=dinfo->output_width*tjPixelSize[pixelFormat]; |
| 800 | |
| 801 | #ifndef JCS_EXTENSIONS |
| 802 | if(pixelFormat!=TJPF_GRAY && |
| 803 | (RGB_RED!=tjRedOffset[pixelFormat] || |
| 804 | RGB_GREEN!=tjGreenOffset[pixelFormat] || |
| 805 | RGB_BLUE!=tjBlueOffset[pixelFormat] || |
| 806 | RGB_PIXELSIZE!=tjPixelSize[pixelFormat])) |
| 807 | { |
| 808 | rgbBuf=(unsigned char *)malloc(width*height*3); |
| 809 | if(!rgbBuf) _throw("tjDecompress2(): Memory allocation failure"); |
| 810 | _pitch=pitch; pitch=width*3; |
| 811 | _dstBuf=dstBuf; dstBuf=rgbBuf; |
| 812 | } |
| 813 | #endif |
| 814 | |
| 815 | if((row_pointer=(JSAMPROW *)malloc(sizeof(JSAMPROW) |
| 816 | *dinfo->output_height))==NULL) |
| 817 | _throw("tjDecompress2(): Memory allocation failure"); |
| 818 | for(i=0; i<(int)dinfo->output_height; i++) |
| 819 | { |
| 820 | if(flags&TJFLAG_BOTTOMUP) |
| 821 | row_pointer[i]=&dstBuf[(dinfo->output_height-i-1)*pitch]; |
| 822 | else row_pointer[i]=&dstBuf[i*pitch]; |
| 823 | } |
| 824 | while(dinfo->output_scanline<dinfo->output_height) |
| 825 | { |
| 826 | jpeg_read_scanlines(dinfo, &row_pointer[dinfo->output_scanline], |
| 827 | dinfo->output_height-dinfo->output_scanline); |
| 828 | } |
| 829 | jpeg_finish_decompress(dinfo); |
| 830 | |
| 831 | #ifndef JCS_EXTENSIONS |
| 832 | fromRGB(rgbBuf, _dstBuf, width, _pitch, height, pixelFormat); |
| 833 | #endif |
| 834 | |
| 835 | bailout: |
| 836 | if(dinfo->global_state>DSTATE_START) jpeg_abort_decompress(dinfo); |
| 837 | #ifndef JCS_EXTENSIONS |
| 838 | if(rgbBuf) free(rgbBuf); |
| 839 | #endif |
| 840 | if(row_pointer) free(row_pointer); |
| 841 | return retval; |
| 842 | } |
| 843 | |
| 844 | DLLEXPORT int DLLCALL tjDecompress(tjhandle handle, unsigned char *jpegBuf, |
| 845 | unsigned long jpegSize, unsigned char *dstBuf, int width, int pitch, |
| 846 | int height, int pixelSize, int flags) |
| 847 | { |
| 848 | return tjDecompress2(handle, jpegBuf, jpegSize, dstBuf, width, pitch, |
| 849 | height, getPixelFormat(pixelSize, flags), flags); |
| 850 | } |