turbojpeg.c 源码

于 2015-07-15 16:59:49 发布
阅读量1.2k 收藏
点赞数
分类专栏： C/C++
版权声明：本文为博主原创文章，遵循 CC 4.0 BY-SA 版权协议，转载请附上原文出处链接和本声明。
本文链接：https://blog.csdn.net/sandshaw/article/details/46895669
版权
本文档是 TurboJPEG 库的源代码，主要实现了 TurboJPEG API 的功能，利用 libjpeg-turbo 库进行 JPEG 图像的压缩和解压缩。源码中包含了错误处理、内存输入/输出源、颜色空间转换等核心功能。

摘要生成于 C知道 ，由 DeepSeek-R1 满血版支持， 前往体验 >

记录下来 备忘

点击(此处)折叠或打开

  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.  */

  29. /* TurboJPEG/OSS: this implements the TurboJPEG API using libjpeg-turbo */

  31. #include <stdio.h>
  32. #include <stdlib.h>
  33. #include <jinclude.h>
  34. #define JPEG_INTERNALS
  35. #include <jpeglib.h>
  36. #include <jerror.h>
  37. #include <setjmp.h>
  38. #include "./turbojpeg.h"
  39. #include "./tjutil.h"
  40. #include "transupp.h"

  42. extern void jpeg_mem_dest_tj(j_compress_ptr, unsigned char **,
  43.     unsigned long *, boolean);
  44. extern void jpeg_mem_src_tj(j_decompress_ptr, unsigned char *, unsigned long);

  46. #define PAD(v, p) ((v+(p)-1)&(~((p)-1)))


  49. /* Error handling (based on example in example.c) */

  51. static char errStr[JMSG_LENGTH_MAX]="No error";

  53. struct my_error_mgr
  54. {
  55.     struct jpeg_error_mgr pub;
  56.     jmp_buf setjmp_buffer;
  57. };
  58. typedef struct my_error_mgr *my_error_ptr;

  60. static void my_error_exit(j_common_ptr cinfo)
  61. {
  62.     my_error_ptr myerr=(my_error_ptr)cinfo->err;
  63.     (*cinfo->err->output_message)(cinfo);
  64.     longjmp(myerr->setjmp_buffer, 1);
  65. }

  67. /* Based on output_message() in jerror.c */

  69. static void my_output_message(j_common_ptr cinfo)
  70. {
  71.     (*cinfo->err->format_message)(cinfo, errStr);
  72. }


  75. /* Global structures, macros, etc. */

  77. enum {COMPRESS=1, DECOMPRESS=2};

  79. typedef struct _tjinstance
  80. {
  81.     struct jpeg_compress_struct cinfo;
  82.     struct jpeg_decompress_struct dinfo;
  83.     struct my_error_mgr jerr;
  84.     int init;
  85. } tjinstance;

  87. static const int pixelsize[TJ_NUMSAMP]={3, 3, 3, 1, 3};

  89. static const JXFORM_CODE xformtypes[TJ_NUMXOP]=
  90. {
  91.     JXFORM_NONE, JXFORM_FLIP_H, JXFORM_FLIP_V, JXFORM_TRANSPOSE,
  92.     JXFORM_TRANSVERSE, JXFORM_ROT_90, JXFORM_ROT_180, JXFORM_ROT_270
  93. };

  95. #define NUMSF 16
  96. static const tjscalingfactor sf[NUMSF]={
  97.     {2, 1},
  98.     {15, 8},
  99.     {7, 4},
  100.     {13, 8},
  101.     {3, 2},
  102.     {11, 8},
  103.     {5, 4},
  104.     {9, 8},
  105.     {1, 1},
  106.     {7, 8},
  107.     {3, 4},
  108.     {5, 8},
  109.     {1, 2},
  110.     {3, 8},
  111.     {1, 4},
  112.     {1, 8}
  113. };

  115. #define _throw(m) {snprintf(errStr, JMSG_LENGTH_MAX, "%s", m); \
  116.     retval=-1; goto bailout;}
  117. #define getinstance(handle) tjinstance *this=(tjinstance *)handle; \
  118.     j_compress_ptr cinfo=NULL; j_decompress_ptr dinfo=NULL; \
  119.     if(!this) {snprintf(errStr, JMSG_LENGTH_MAX, "Invalid handle"); \
  120.         return -1;} \
  121.     cinfo=&this->cinfo; dinfo=&this->dinfo;

  123. static int getPixelFormat(int pixelSize, int flags)
  124. {
  125.     if(pixelSize==1) return TJPF_GRAY;
  126.     if(pixelSize==3)
  127.     {
  128.         if(flags&TJ_BGR) return TJPF_BGR;
  129.         else return TJPF_RGB;
  130.     }
  131.     if(pixelSize==4)
  132.     {
  133.         if(flags&TJ_ALPHAFIRST)
  134.         {
  135.             if(flags&TJ_BGR) return TJPF_XBGR;
  136.             else return TJPF_XRGB;
  137.         }
  138.         else
  139.         {
  140.             if(flags&TJ_BGR) return TJPF_BGRX;
  141.             else return TJPF_RGBX;
  142.         }
  143.     }
  144.     return -1;
  145. }

  147. static int setCompDefaults(struct jpeg_compress_struct *cinfo,
  148.     int pixelFormat, int subsamp, int jpegQual, int flags)
  149. {
  150.     int retval=0;

  152.     switch(pixelFormat)
  153.     {
  154.         case TJPF_GRAY:
  155.             cinfo->in_color_space=JCS_GRAYSCALE; break;
  156.         #if JCS_EXTENSIONS==1
  157.         case TJPF_RGB:
  158.             cinfo->in_color_space=JCS_EXT_RGB; break;
  159.         case TJPF_BGR:
  160.             cinfo->in_color_space=JCS_EXT_BGR; break;
  161.         case TJPF_RGBX:
  162.         case TJPF_RGBA:
  163.             cinfo->in_color_space=JCS_EXT_RGBX; break;
  164.         case TJPF_BGRX:
  165.         case TJPF_BGRA:
  166.             cinfo->in_color_space=JCS_EXT_BGRX; break;
  167.         case TJPF_XRGB:
  168.         case TJPF_ARGB:
  169.             cinfo->in_color_space=JCS_EXT_XRGB; break;
  170.         case TJPF_XBGR:
  171.         case TJPF_ABGR:
  172.             cinfo->in_color_space=JCS_EXT_XBGR; break;
  173.         #else
  174.         case TJPF_RGB:
  175.         case TJPF_BGR:
  176.         case TJPF_RGBX:
  177.         case TJPF_BGRX:
  178.         case TJPF_XRGB:
  179.         case TJPF_XBGR:
  180.         case TJPF_RGBA:
  181.         case TJPF_BGRA:
  182.         case TJPF_ARGB:
  183.         case TJPF_ABGR:
  184.             cinfo->in_color_space=JCS_RGB; pixelFormat=TJPF_RGB;
  185.             break;
  186.         #endif
  187.     }

  189.     cinfo->input_components=tjPixelSize[pixelFormat];
  190.     jpeg_set_defaults(cinfo);
  191.     if(jpegQual>=0)
  192.     {
  193.         jpeg_set_quality(cinfo, jpegQual, TRUE);
  194.         if(jpegQual>=96 || flags&TJFLAG_ACCURATEDCT) cinfo->dct_method=JDCT_ISLOW;
  195.         else cinfo->dct_method=JDCT_FASTEST;
  196.     }
  197.     if(subsamp==TJSAMP_GRAY)
  198.         jpeg_set_colorspace(cinfo, JCS_GRAYSCALE);
  199.     else
  200.         jpeg_set_colorspace(cinfo, JCS_YCbCr);

  202.     cinfo->comp_info[0].h_samp_factor=tjMCUWidth[subsamp]/8;
  203.     cinfo->comp_info[1].h_samp_factor=1;
  204.     cinfo->comp_info[2].h_samp_factor=1;
  205.     cinfo->comp_info[0].v_samp_factor=tjMCUHeight[subsamp]/8;
  206.     cinfo->comp_info[1].v_samp_factor=1;
  207.     cinfo->comp_info[2].v_samp_factor=1;

  209.     return retval;
  210. }

  212. static int setDecompDefaults(struct jpeg_decompress_struct *dinfo,
  213.     int pixelFormat, int flags)
  214. {
  215.     int retval=0;

  217.     switch(pixelFormat)
  218.     {
  219.         case TJPF_GRAY:
  220.             dinfo->out_color_space=JCS_GRAYSCALE; break;
  221.         #if JCS_EXTENSIONS==1
  222.         case TJPF_RGB:
  223.             dinfo->out_color_space=JCS_EXT_RGB; break;
  224.         case TJPF_BGR:
  225.             dinfo->out_color_space=JCS_EXT_BGR; break;
  226.         case TJPF_RGBX:
  227.             dinfo->out_color_space=JCS_EXT_RGBX; break;
  228.         case TJPF_BGRX:
  229.             dinfo->out_color_space=JCS_EXT_BGRX; break;
  230.         case TJPF_XRGB:
  231.             dinfo->out_color_space=JCS_EXT_XRGB; break;
  232.         case TJPF_XBGR:
  233.             dinfo->out_color_space=JCS_EXT_XBGR; break;
  234.         #if JCS_ALPHA_EXTENSIONS==1
  235.         case TJPF_RGBA:
  236.             dinfo->out_color_space=JCS_EXT_RGBA; break;
  237.         case TJPF_BGRA:
  238.             dinfo->out_color_space=JCS_EXT_BGRA; break;
  239.         case TJPF_ARGB:
  240.             dinfo->out_color_space=JCS_EXT_ARGB; break;
  241.         case TJPF_ABGR:
  242.             dinfo->out_color_space=JCS_EXT_ABGR; break;
  243.         #endif
  244.         #else
  245.         case TJPF_RGB:
  246.         case TJPF_BGR:
  247.         case TJPF_RGBX:
  248.         case TJPF_BGRX:
  249.         case TJPF_XRGB:
  250.         case TJPF_XBGR:
  251.         case TJPF_RGBA:
  252.         case TJPF_BGRA:
  253.         case TJPF_ARGB:
  254.         case TJPF_ABGR:
  255.             dinfo->out_color_space=JCS_RGB; break;
  256.         #endif
  257.         default:
  258.             _throw("Unsupported pixel format");
  259.     }

  261.     if(flags&TJFLAG_FASTDCT) dinfo->dct_method=JDCT_FASTEST;

  263.     bailout:
  264.     return retval;
  265. }


  268. static int getSubsamp(j_decompress_ptr dinfo)
  269. {
  270.     int retval=-1, i, k;
  271.     for(i=0; i<NUMSUBOPT; i++)
  272.     {
  273.         if(dinfo->num_components==pixelsize[i])
  274.         {
  275.             if(dinfo->comp_info[0].h_samp_factor==tjMCUWidth[i]/8
  276.                 && dinfo->comp_info[0].v_samp_factor==tjMCUHeight[i]/8)
  277.             {
  278.                 int match=0;
  279.                 for(k=1; k<dinfo->num_components; k++)
  280.                 {
  281.                     if(dinfo->comp_info[k].h_samp_factor==1
  282.                         && dinfo->comp_info[k].v_samp_factor==1)
  283.                         match++;
  284.                 }
  285.                 if(match==dinfo->num_components-1)
  286.                 {
  287.                     retval=i; break;
  288.                 }
  289.             }
  290.         }
  291.     }
  292.     return retval;
  293. }


  296. #ifndef JCS_EXTENSIONS

  298. /* Conversion functions to emulate the colorspace extensions. This allows the
  299.    TurboJPEG wrapper to be used with libjpeg */

  301. #define TORGB(PS, ROFFSET, GOFFSET, BOFFSET) { \
  302.     int rowPad=pitch-width*PS; \
  303.     while(height--) \
  304.     { \
  305.         unsigned char *endOfRow=src+width*PS; \
  306.         while(src<endOfRow) \
  307.         { \
  308.             dst[RGB_RED]=src[ROFFSET]; \
  309.             dst[RGB_GREEN]=src[GOFFSET]; \
  310.             dst[RGB_BLUE]=src[BOFFSET]; \
  311.             dst+=RGB_PIXELSIZE; src+=PS; \
  312.         } \
  313.         src+=rowPad; \
  314.     } \
  315. }

  317. static unsigned char *toRGB(unsigned char *src, int width, int pitch,
  318.     int height, int pixelFormat, unsigned char *dst)
  319. {
  320.     unsigned char *retval=src;
  321.     switch(pixelFormat)
  322.     {
  323.         case TJPF_RGB:
  324.             #if RGB_RED!=0 || RGB_GREEN!=1 || RGB_BLUE!=2 || RGB_PIXELSIZE!=3
  325.             retval=dst; TORGB(3, 0, 1, 2);
  326.             #endif
  327.             break;
  328.         case TJPF_BGR:
  329.             #if RGB_RED!=2 || RGB_GREEN!=1 || RGB_BLUE!=0 || RGB_PIXELSIZE!=3
  330.             retval=dst; TORGB(3, 2, 1, 0);
  331.             #endif
  332.             break;
  333.         case TJPF_RGBX:
  334.         case TJPF_RGBA:
  335.             #if RGB_RED!=0 || RGB_GREEN!=1 || RGB_BLUE!=2 || RGB_PIXELSIZE!=4
  336.             retval=dst; TORGB(4, 0, 1, 2);
  337.             #endif
  338.             break;
  339.         case TJPF_BGRX:
  340.         case TJPF_BGRA:
  341.             #if RGB_RED!=2 || RGB_GREEN!=1 || RGB_BLUE!=0 || RGB_PIXELSIZE!=4
  342.             retval=dst; TORGB(4, 2, 1, 0);
  343.             #endif
  344.             break;
  345.         case TJPF_XRGB:
  346.         case TJPF_ARGB:
  347.             #if RGB_RED!=1 || RGB_GREEN!=2 || RGB_BLUE!=3 || RGB_PIXELSIZE!=4
  348.             retval=dst; TORGB(4, 1, 2, 3);
  349.             #endif
  350.             break;
  351.         case TJPF_XBGR:
  352.         case TJPF_ABGR:
  353.             #if RGB_RED!=3 || RGB_GREEN!=2 || RGB_BLUE!=1 || RGB_PIXELSIZE!=4
  354.             retval=dst; TORGB(4, 3, 2, 1);
  355.             #endif
  356.             break;
  357.     }
  358.     return retval;
  359. }

  361. #define FROMRGB(PS, ROFFSET, GOFFSET, BOFFSET, SETALPHA) { \
  362.     int rowPad=pitch-width*PS; \
  363.     while(height--) \
  364.     { \
  365.         unsigned char *endOfRow=dst+width*PS; \
  366.         while(dst<endOfRow) \
  367.         { \
  368.             dst[ROFFSET]=src[RGB_RED]; \
  369.             dst[GOFFSET]=src[RGB_GREEN]; \
  370.             dst[BOFFSET]=src[RGB_BLUE]; \
  371.             SETALPHA \
  372.             dst+=PS; src+=RGB_PIXELSIZE; \
  373.         } \
  374.         dst+=rowPad; \
  375.     } \
  376. }

  378. static void fromRGB(unsigned char *src, unsigned char *dst, int width,
  379.     int pitch, int height, int pixelFormat)
  380. {
  381.     switch(pixelFormat)
  382.     {
  383.         case TJPF_RGB:
  384.             #if RGB_RED!=0 || RGB_GREEN!=1 || RGB_BLUE!=2 || RGB_PIXELSIZE!=3
  385.             FROMRGB(3, 0, 1, 2,);
  386.             #endif
  387.             break;
  388.         case TJPF_BGR:
  389.             #if RGB_RED!=2 || RGB_GREEN!=1 || RGB_BLUE!=0 || RGB_PIXELSIZE!=3
  390.             FROMRGB(3, 2, 1, 0,);
  391.             #endif
  392.             break;
  393.         case TJPF_RGBX:
  394.             #if RGB_RED!=0 || RGB_GREEN!=1 || RGB_BLUE!=2 || RGB_PIXELSIZE!=4
  395.             FROMRGB(4, 0, 1, 2,);
  396.             #endif
  397.             break;
  398.         case TJPF_RGBA:
  399.             #if RGB_RED!=0 || RGB_GREEN!=1 || RGB_BLUE!=2 || RGB_PIXELSIZE!=4
  400.             FROMRGB(4, 0, 1, 2, dst[3]=0xFF;);
  401.             #endif
  402.             break;
  403.         case TJPF_BGRX:
  404.             #if RGB_RED!=2 || RGB_GREEN!=1 || RGB_BLUE!=0 || RGB_PIXELSIZE!=4
  405.             FROMRGB(4, 2, 1, 0,);
  406.             #endif
  407.             break;
  408.         case TJPF_BGRA:
  409.             #if RGB_RED!=2 || RGB_GREEN!=1 || RGB_BLUE!=0 || RGB_PIXELSIZE!=4
  410.             FROMRGB(4, 2, 1, 0, dst[3]=0xFF;); return;
  411.             #endif
  412.             break;
  413.         case TJPF_XRGB:
  414.             #if RGB_RED!=1 || RGB_GREEN!=2 || RGB_BLUE!=3 || RGB_PIXELSIZE!=4
  415.             FROMRGB(4, 1, 2, 3,); return;
  416.             #endif
  417.             break;
  418.         case TJPF_ARGB:
  419.             #if RGB_RED!=1 || RGB_GREEN!=2 || RGB_BLUE!=3 || RGB_PIXELSIZE!=4
  420.             FROMRGB(4, 1, 2, 3, dst[0]=0xFF;); return;
  421.             #endif
  422.             break;
  423.         case TJPF_XBGR:
  424.             #if RGB_RED!=3 || RGB_GREEN!=2 || RGB_BLUE!=1 || RGB_PIXELSIZE!=4
  425.             FROMRGB(4, 3, 2, 1,); return;
  426.             #endif
  427.             break;
  428.         case TJPF_ABGR:
  429.             #if RGB_RED!=3 || RGB_GREEN!=2 || RGB_BLUE!=1 || RGB_PIXELSIZE!=4
  430.             FROMRGB(4, 3, 2, 1, dst[0]=0xFF;); return;
  431.             #endif
  432.             break;
  433.     }
  434. }

  436. #endif


  439. /* General API functions */

  441. DLLEXPORT char* DLLCALL tjGetErrorStr(void)
  442. {
  443.     return errStr;
  444. }


  447. DLLEXPORT int DLLCALL tjDestroy(tjhandle handle)
  448. {
  449.     getinstance(handle);
  450.     if(setjmp(this->jerr.setjmp_buffer)) return -1;
  451.     if(this->init&COMPRESS) jpeg_destroy_compress(cinfo);
  452.     if(this->init&DECOMPRESS) jpeg_destroy_decompress(dinfo);
  453.     free(this);
  454.     return 0;
  455. }


  458. /* These are exposed mainly because Windows can't malloc() and free() across
  459.    DLL boundaries except when the CRT DLL is used, and we don't use the CRT DLL
  460.    with turbojpeg.dll for compatibility reasons. However, these functions
  461.    can potentially be used for other purposes by different implementations. */

  463. DLLEXPORT void DLLCALL tjFree(unsigned char *buf)
  464. {
  465.     if(buf) free(buf);
  466. }


  469. DLLEXPORT unsigned char *DLLCALL tjAlloc(int bytes)
  470. {
  471.     return (unsigned char *)malloc(bytes);
  472. }


  475. /* Compressor */

  477. static tjhandle _tjInitCompress(tjinstance *this)
  478. {
  479.     unsigned char buffer[1], *buf=buffer; unsigned long size=1;

  481.     /* This is also straight out of example.c */
  482.     this->cinfo.err=jpeg_std_error(&this->jerr.pub);
  483.     this->jerr.pub.error_exit=my_error_exit;
  484.     this->jerr.pub.output_message=my_output_message;

  486.     if(setjmp(this->jerr.setjmp_buffer))
  487.     {
  488.         /* If we get here, the JPEG code has signaled an error. */
  489.         if(this) free(this); return NULL;
  490.     }

  492.     jpeg_create_compress(&this->cinfo);
  493.     /* Make an initial call so it will create the destination manager */
  494.     jpeg_mem_dest_tj(&this->cinfo, &buf, &size, 0);

  496.     this->init|=COMPRESS;
  497.     return (tjhandle)this;
  498. }

  500. DLLEXPORT tjhandle DLLCALL tjInitCompress(void)
  501. {
  502.     tjinstance *this=NULL;
  503.     if((this=(tjinstance *)malloc(sizeof(tjinstance)))==NULL)
  504.     {
  505.         snprintf(errStr, JMSG_LENGTH_MAX,
  506.             "tjInitCompress(): Memory allocation failure");
  507.         return NULL;
  508.     }
  509.     MEMZERO(this, sizeof(tjinstance));
  510.     return _tjInitCompress(this);
  511. }


  514. DLLEXPORT unsigned long DLLCALL tjBufSize(int width, int height,
  515.     int jpegSubsamp)
  516. {
  517.     unsigned long retval=0; int mcuw, mcuh, chromasf;
  518.     if(width<1 || height<1 || jpegSubsamp<0 || jpegSubsamp>=NUMSUBOPT)
  519.         _throw("tjBufSize(): Invalid argument");

  521.     // This allows for rare corner cases in which a JPEG image can actually be
  522.     // larger than the uncompressed input (we wouldn't mention it if it hadn't
  523.     // happened before.)
  524.     mcuw=tjMCUWidth[jpegSubsamp];
  525.     mcuh=tjMCUHeight[jpegSubsamp];
  526.     chromasf=jpegSubsamp==TJSAMP_GRAY? 0: 4*64/(mcuw*mcuh);
  527.     retval=PAD(width, mcuw) * PAD(height, mcuh) * (2 + chromasf) + 2048;

  529.     bailout:
  530.     return retval;
  531. }


  534. DLLEXPORT unsigned long DLLCALL TJBUFSIZE(int width, int height)
  535. {
  536.     unsigned long retval=0;
  537.     if(width<1 || height<1)
  538.         _throw("TJBUFSIZE(): Invalid argument");

  540.     // This allows for rare corner cases in which a JPEG image can actually be
  541.     // larger than the uncompressed input (we wouldn't mention it if it hadn't
  542.     // happened before.)
  543.     retval=PAD(width, 16) * PAD(height, 16) * 6 + 2048;

  545.     bailout:
  546.     return retval;
  547. }


  550. DLLEXPORT unsigned long DLLCALL tjBufSizeYUV(int width, int height,
  551.     int subsamp)
  552. {
  553.     unsigned long retval=0;
  554.     int pw, ph, cw, ch;
  555.     if(width<1 || height<1 || subsamp<0 || subsamp>=NUMSUBOPT)
  556.         _throw("tjBufSizeYUV(): Invalid argument");
  557.     pw=PAD(width, tjMCUWidth[subsamp]/8);
  558.     ph=PAD(height, tjMCUHeight[subsamp]/8);
  559.     cw=pw*8/tjMCUWidth[subsamp]; ch=ph*8/tjMCUHeight[subsamp];
  560.     retval=PAD(pw, 4)*ph + (subsamp==TJSAMP_GRAY? 0:PAD(cw, 4)*ch*2);

  562.     bailout:
  563.     return retval;
  564. }


  567. DLLEXPORT unsigned long DLLCALL TJBUFSIZEYUV(int width, int height,
  568.     int subsamp)
  569. {
  570.     return tjBufSizeYUV(width, height, subsamp);
  571. }


  574. DLLEXPORT int DLLCALL tjCompress2(tjhandle handle, unsigned char *srcBuf,
  575.     int width, int pitch, int height, int pixelFormat, unsigned char **jpegBuf,
  576.     unsigned long *jpegSize, int jpegSubsamp, int jpegQual, int flags)
  577. {
  578.     int i, retval=0, alloc=1; JSAMPROW *row_pointer=NULL;
  579.     #ifndef JCS_EXTENSIONS
  580.     unsigned char *rgbBuf=NULL;
  581.     #endif

  583.     getinstance(handle)
  584.     if((this->init&COMPRESS)==0)
  585.         _throw("tjCompress2(): Instance has not been initialized for compression");

  587.     if(srcBuf==NULL || width<=0 || pitch<0 || height<=0 || pixelFormat<0
  588.         || pixelFormat>=TJ_NUMPF || jpegBuf==NULL || jpegSize==NULL
  589.         || jpegSubsamp<0 || jpegSubsamp>=NUMSUBOPT || jpegQual<0 || jpegQual>100)
  590.         _throw("tjCompress2(): Invalid argument");

  592.     if(setjmp(this->jerr.setjmp_buffer))
  593.     {
  594.         /* If we get here, the JPEG code has signaled an error. */
  595.         retval=-1;
  596.         goto bailout;
  597.     }

  599.     if(pitch==0) pitch=width*tjPixelSize[pixelFormat];

  601.     #ifndef JCS_EXTENSIONS
  602.     if(pixelFormat!=TJPF_GRAY)
  603.     {
  604.         rgbBuf=(unsigned char *)malloc(width*height*RGB_PIXELSIZE);
  605.         if(!rgbBuf) _throw("tjCompress2(): Memory allocation failure");
  606.         srcBuf=toRGB(srcBuf, width, pitch, height, pixelFormat, rgbBuf);
  607.         pitch=width*RGB_PIXELSIZE;
  608.     }
  609.     #endif

  611.     cinfo->image_width=width;
  612.     cinfo->image_height=height;

  614.     if(flags&TJFLAG_FORCEMMX) putenv("JSIMD_FORCEMMX=1");
  615.     else if(flags&TJFLAG_FORCESSE) putenv("JSIMD_FORCESSE=1");
  616.     else if(flags&TJFLAG_FORCESSE2) putenv("JSIMD_FORCESSE2=1");

  618.     if(flags&TJFLAG_NOREALLOC)
  619.     {
  620.         alloc=0; *jpegSize=tjBufSize(width, height, jpegSubsamp);
  621.     }
  622.     jpeg_mem_dest_tj(cinfo, jpegBuf, jpegSize, alloc);
  623.     if(setCompDefaults(cinfo, pixelFormat, jpegSubsamp, jpegQual, flags)==-1)
  624.         return -1;

  626.     jpeg_start_compress(cinfo, TRUE);
  627.     if((row_pointer=(JSAMPROW *)malloc(sizeof(JSAMPROW)*height))==NULL)
  628.         _throw("tjCompress2(): Memory allocation failure");
  629.     for(i=0; i<height; i++)
  630.     {
  631.         if(flags&TJFLAG_BOTTOMUP) row_pointer[i]=&srcBuf[(height-i-1)*pitch];
  632.         else row_pointer[i]=&srcBuf[i*pitch];
  633.     }
  634.     while(cinfo->next_scanline<cinfo->image_height)
  635.     {
  636.         jpeg_write_scanlines(cinfo, &row_pointer[cinfo->next_scanline],
  637.             cinfo->image_height-cinfo->next_scanline);
  638.     }
  639.     jpeg_finish_compress(cinfo);

  641.     bailout:
  642.     if(cinfo->global_state>CSTATE_START) jpeg_abort_compress(cinfo);
  643.     #ifndef JCS_EXTENSIONS
  644.     if(rgbBuf) free(rgbBuf);
  645.     #endif
  646.     if(row_pointer) free(row_pointer);
  647.     return retval;
  648. }

  650. DLLEXPORT int DLLCALL tjCompress(tjhandle handle, unsigned char *srcBuf,
  651.     int width, int pitch, int height, int pixelSize, unsigned char *jpegBuf,
  652.     unsigned long *jpegSize, int jpegSubsamp, int jpegQual, int flags)
  653. {
  654.     int retval=0; unsigned long size;
  655.     if(flags&TJ_YUV)
  656.     {
  657.         size=tjBufSizeYUV(width, height, jpegSubsamp);
  658.         retval=tjEncodeYUV2(handle, srcBuf, width, pitch, height,
  659.             getPixelFormat(pixelSize, flags), jpegBuf, jpegSubsamp, flags);
  660.     }
  661.     else
  662.     {
  663.         retval=tjCompress2(handle, srcBuf, width, pitch, height,
  664.             getPixelFormat(pixelSize, flags), &jpegBuf, &size, jpegSubsamp, jpegQual,
  665.             flags|TJFLAG_NOREALLOC);
  666.     }
  667.     *jpegSize=size;
  668.     return retval;
  669. }


  672. DLLEXPORT int DLLCALL tjEncodeYUV2(tjhandle handle, unsigned char *srcBuf,
  673.     int width, int pitch, int height, int pixelFormat, unsigned char *dstBuf,
  674.     int subsamp, int flags)
  675. {
  676.     int i, retval=0; JSAMPROW *row_pointer=NULL;
  677.     JSAMPLE *_tmpbuf[MAX_COMPONENTS], *_tmpbuf2[MAX_COMPONENTS];
  678.     JSAMPROW *tmpbuf[MAX_COMPONENTS], *tmpbuf2[MAX_COMPONENTS];
  679.     JSAMPROW *outbuf[MAX_COMPONENTS];
  680.     int row, pw, ph, cw[MAX_COMPONENTS], ch[MAX_COMPONENTS];
  681.     JSAMPLE *ptr=dstBuf;
  682.     unsigned long yuvsize=0;
  683.     jpeg_component_info *compptr;
  684.     #ifndef JCS_EXTENSIONS
  685.     unsigned char *rgbBuf=NULL;
  686.     #endif

  688.     getinstance(handle);
  689.     if((this->init&COMPRESS)==0)
  690.         _throw("tjEncodeYUV2(): Instance has not been initialized for compression");

  692.     for(i=0; i<MAX_COMPONENTS; i++)
  693.     {
  694.         tmpbuf[i]=NULL; _tmpbuf[i]=NULL;
  695.         tmpbuf2[i]=NULL; _tmpbuf2[i]=NULL; outbuf[i]=NULL;
  696.     }

  698.     if(srcBuf==NULL || width<=0 || pitch<0 || height<=0 || pixelFormat<0
  699.         || pixelFormat>=TJ_NUMPF || dstBuf==NULL || subsamp<0
  700.         || subsamp>=NUMSUBOPT)
  701.         _throw("tjEncodeYUV2(): Invalid argument");

  703.     if(setjmp(this->jerr.setjmp_buffer))
  704.     {
  705.         /* If we get here, the JPEG code has signaled an error. */
  706.         retval=-1;
  707.         goto bailout;
  708.     }

  710.     if(pitch==0) pitch=width*tjPixelSize[pixelFormat];

  712.     #ifndef JCS_EXTENSIONS
  713.     if(pixelFormat!=TJPF_GRAY)
  714.     {
  715.         rgbBuf=(unsigned char *)malloc(width*height*RGB_PIXELSIZE);
  716.         if(!rgbBuf) _throw("tjEncodeYUV2(): Memory allocation failure");
  717.         srcBuf=toRGB(srcBuf, width, pitch, height, pixelFormat, rgbBuf);
  718.         pitch=width*RGB_PIXELSIZE;
  719.     }
  720.     #endif

  722.     cinfo->image_width=width;
  723.     cinfo->image_height=height;

  725.     if(flags&TJFLAG_FORCEMMX) putenv("JSIMD_FORCEMMX=1");
  726.     else if(flags&TJFLAG_FORCESSE) putenv("JSIMD_FORCESSE=1");
  727.     else if(flags&TJFLAG_FORCESSE2) putenv("JSIMD_FORCESSE2=1");

  729.     yuvsize=tjBufSizeYUV(width, height, subsamp);
  730.     jpeg_mem_dest_tj(cinfo, &dstBuf, &yuvsize, 0);
  731.     if(setCompDefaults(cinfo, pixelFormat, subsamp, -1, flags)==-1) return -1;

  733.     jpeg_start_compress(cinfo, TRUE);
  734.     pw=PAD(width, cinfo->max_h_samp_factor);
  735.     ph=PAD(height, cinfo->max_v_samp_factor);

  737.     if((row_pointer=(JSAMPROW *)malloc(sizeof(JSAMPROW)*ph))==NULL)
  738.         _throw("tjEncodeYUV2(): Memory allocation failure");
  739.     for(i=0; i<height; i++)
  740.     {
  741.         if(flags&TJFLAG_BOTTOMUP) row_pointer[i]=&srcBuf[(height-i-1)*pitch];
  742.         else row_pointer[i]=&srcBuf[i*pitch];
  743.     }
  744.     if(height<ph)
  745.         for(i=height; i<ph; i++) row_pointer[i]=row_pointer[height-1];

  747.     for(i=0; i<cinfo->num_components; i++)
  748.     {
  749.         compptr=&cinfo->comp_info[i];
  750.         _tmpbuf[i]=(JSAMPLE *)malloc(
  751.             PAD((compptr->width_in_blocks*cinfo->max_h_samp_factor*DCTSIZE)
  752.                 /compptr->h_samp_factor, 16) * cinfo->max_v_samp_factor + 16);
  753.         if(!_tmpbuf[i]) _throw("tjEncodeYUV2(): Memory allocation failure");
  754.         tmpbuf[i]=(JSAMPROW *)malloc(sizeof(JSAMPROW)*cinfo->max_v_samp_factor);
  755.         if(!tmpbuf[i]) _throw("tjEncodeYUV2(): Memory allocation failure");
  756.         for(row=0; row<cinfo->max_v_samp_factor; row++)
  757.         {
  758.             unsigned char *_tmpbuf_aligned=
  759.                 (unsigned char *)PAD((size_t)_tmpbuf[i], 16);
  760.             tmpbuf[i][row]=&_tmpbuf_aligned[
  761.                 PAD((compptr->width_in_blocks*cinfo->max_h_samp_factor*DCTSIZE)
  762.                     /compptr->h_samp_factor, 16) * row];
  763.         }
  764.         _tmpbuf2[i]=(JSAMPLE *)malloc(PAD(compptr->width_in_blocks*DCTSIZE, 16)
  765.             * compptr->v_samp_factor + 16);
  766.         if(!_tmpbuf2[i]) _throw("tjEncodeYUV2(): Memory allocation failure");
  767.         tmpbuf2[i]=(JSAMPROW *)malloc(sizeof(JSAMPROW)*compptr->v_samp_factor);
  768.         if(!tmpbuf2[i]) _throw("tjEncodeYUV2(): Memory allocation failure");
  769.         for(row=0; row<compptr->v_samp_factor; row++)
  770.         {
  771.             unsigned char *_tmpbuf2_aligned=
  772.                 (unsigned char *)PAD((size_t)_tmpbuf2[i], 16);
  773.             tmpbuf2[i][row]=&_tmpbuf2_aligned[
  774.                 PAD(compptr->width_in_blocks*DCTSIZE, 16) * row];
  775.         }
  776.         cw[i]=pw*compptr->h_samp_factor/cinfo->max_h_samp_factor;
  777.         ch[i]=ph*compptr->v_samp_factor/cinfo->max_v_samp_factor;
  778.         outbuf[i]=(JSAMPROW *)malloc(sizeof(JSAMPROW)*ch[i]);
  779.         if(!outbuf[i]) _throw("tjEncodeYUV2(): Memory allocation failure");
  780.         for(row=0; row<ch[i]; row++)
  781.         {
  782.             outbuf[i][row]=ptr;
  783.             ptr+=PAD(cw[i], 4);
  784.         }
  785.     }
  786.     if(yuvsize!=(unsigned long)(ptr-dstBuf))
  787.         _throw("tjEncodeYUV2(): Generated image is not the correct size");

  789.     for(row=0; row<ph; row+=cinfo->max_v_samp_factor)
  790.     {
  791.         (*cinfo->cconvert->color_convert)(cinfo, &row_pointer[row], tmpbuf, 0,
  792.             cinfo->max_v_samp_factor);
  793.         (cinfo->downsample->downsample)(cinfo, tmpbuf, 0, tmpbuf2, 0);
  794.         for(i=0, compptr=cinfo->comp_info; i<cinfo->num_components; i++, compptr++)
  795.             jcopy_sample_rows(tmpbuf2[i], 0, outbuf[i],
  796.                 row*compptr->v_samp_factor/cinfo->max_v_samp_factor,
  797.                 compptr->v_samp_factor, cw[i]);
  798.     }
  799.     cinfo->next_scanline+=height;
  800.     jpeg_abort_compress(cinfo);

  802.     bailout:
  803.     if(cinfo->global_state>CSTATE_START) jpeg_abort_compress(cinfo);
  804.     #ifndef JCS_EXTENSIONS
  805.     if(rgbBuf) free(rgbBuf);
  806.     #endif
  807.     if(row_pointer) free(row_pointer);
  808.     for(i=0; i<MAX_COMPONENTS; i++)
  809.     {
  810.         if(tmpbuf[i]!=NULL) free(tmpbuf[i]);
  811.         if(_tmpbuf[i]!=NULL) free(_tmpbuf[i]);
  812.         if(tmpbuf2[i]!=NULL) free(tmpbuf2[i]);
  813.         if(_tmpbuf2[i]!=NULL) free(_tmpbuf2[i]);
  814.         if(outbuf[i]!=NULL) free(outbuf[i]);
  815.     }
  816.     return retval;
  817. }

  819. DLLEXPORT int DLLCALL tjEncodeYUV(tjhandle handle, unsigned char *srcBuf,
  820.     int width, int pitch, int height, int pixelSize, unsigned char *dstBuf,
  821.     int subsamp, int flags)
  822. {
  823.     return tjEncodeYUV2(handle, srcBuf, width, pitch, height,
  824.         getPixelFormat(pixelSize, flags), dstBuf, subsamp, flags);
  825. }


  828. /* Decompressor */

  830. static tjhandle _tjInitDecompress(tjinstance *this)
  831. {
  832.     unsigned char buffer[1];

  834.     /* This is also straight out of example.c */
  835.     this->dinfo.err=jpeg_std_error(&this->jerr.pub);
  836.     this->jerr.pub.error_exit=my_error_exit;
  837.     this->jerr.pub.output_message=my_output_message;

  839.     if(setjmp(this->jerr.setjmp_buffer))
  840.     {
  841.         /* If we get here, the JPEG code has signaled an error. */
  842.         if(this) free(this); return NULL;
  843.     }

  845.     jpeg_create_decompress(&this->dinfo);
  846.     /* Make an initial call so it will create the source manager */
  847.     jpeg_mem_src_tj(&this->dinfo, buffer, 1);

  849.     this->init|=DECOMPRESS;
  850.     return (tjhandle)this;
  851. }

  853. DLLEXPORT tjhandle DLLCALL tjInitDecompress(void)
  854. {
  855.     tjinstance *this;
  856.     if((this=(tjinstance *)malloc(sizeof(tjinstance)))==NULL)
  857.     {
  858.         snprintf(errStr, JMSG_LENGTH_MAX,
  859.             "tjInitDecompress(): Memory allocation failure");
  860.         return NULL;
  861.     }
  862.     MEMZERO(this, sizeof(tjinstance));
  863.     return _tjInitDecompress(this);
  864. }


  867. DLLEXPORT int DLLCALL tjDecompressHeader2(tjhandle handle,
  868.     unsigned char *jpegBuf, unsigned long jpegSize, int *width, int *height,
  869.     int *jpegSubsamp)
  870. {
  871.     int retval=0;

  873.     getinstance(handle);
  874.     if((this->init&DECOMPRESS)==0)
  875.         _throw("tjDecompressHeader2(): Instance has not been initialized for decompression");

  877.     if(jpegBuf==NULL || jpegSize<=0 || width==NULL || height==NULL
  878.         || jpegSubsamp==NULL)
  879.         _throw("tjDecompressHeader2(): Invalid argument");

  881.     if(setjmp(this->jerr.setjmp_buffer))
  882.     {
  883.         /* If we get here, the JPEG code has signaled an error. */
  884.         return -1;
  885.     }

  887.     jpeg_mem_src_tj(dinfo, jpegBuf, jpegSize);
  888.     jpeg_read_header(dinfo, TRUE);

  890.     *width=dinfo->image_width;
  891.     *height=dinfo->image_height;
  892.     *jpegSubsamp=getSubsamp(dinfo);

  894.     jpeg_abort_decompress(dinfo);

  896.     if(*jpegSubsamp<0)
  897.         _throw("tjDecompressHeader2(): Could not determine subsampling type for JPEG image");
  898.     if(*width<1 || *height<1)
  899.         _throw("tjDecompressHeader2(): Invalid data returned in header");

  901.     bailout:
  902.     return retval;
  903. }

  905. DLLEXPORT int DLLCALL tjDecompressHeader(tjhandle handle,
  906.     unsigned char *jpegBuf, unsigned long jpegSize, int *width, int *height)
  907. {
  908.     int jpegSubsamp;
  909.     return tjDecompressHeader2(handle, jpegBuf, jpegSize, width, height,
  910.         &jpegSubsamp);
  911. }


  914. DLLEXPORT tjscalingfactor* DLLCALL tjGetScalingFactors(int *numscalingfactors)
  915. {
  916.     if(numscalingfactors==NULL)
  917.     {
  918.         snprintf(errStr, JMSG_LENGTH_MAX,
  919.             "tjGetScalingFactors(): Invalid argument");
  920.         return NULL;
  921.     }

  923.     *numscalingfactors=NUMSF;
  924.     return (tjscalingfactor *)sf;
  925. }


  928. DLLEXPORT int DLLCALL tjDecompress2(tjhandle handle, unsigned char *jpegBuf,
  929.     unsigned long jpegSize, unsigned char *dstBuf, int width, int pitch,
  930.     int height, int pixelFormat, int flags)
  931. {
  932.     int i, retval=0; JSAMPROW *row_pointer=NULL;
  933.     int jpegwidth, jpegheight, scaledw, scaledh;
  934.     #ifndef JCS_EXTENSIONS
  935.     unsigned char *rgbBuf=NULL;
  936.     unsigned char *_dstBuf=NULL; int _pitch=0;
  937.     #endif

  939.     getinstance(handle);
  940.     if((this->init&DECOMPRESS)==0)
  941.         _throw("tjDecompress2(): Instance has not been initialized for decompression");

  943.     if(jpegBuf==NULL || jpegSize<=0 || dstBuf==NULL || width<0 || pitch<0
  944.         || height<0 || pixelFormat<0 || pixelFormat>=TJ_NUMPF)
  945.         _throw("tjDecompress2(): Invalid argument");

  947.     if(flags&TJFLAG_FORCEMMX) putenv("JSIMD_FORCEMMX=1");
  948.     else if(flags&TJFLAG_FORCESSE) putenv("JSIMD_FORCESSE=1");
  949.     else if(flags&TJFLAG_FORCESSE2) putenv("JSIMD_FORCESSE2=1");

  951.     if(setjmp(this->jerr.setjmp_buffer))
  952.     {
  953.         /* If we get here, the JPEG code has signaled an error. */
  954.         retval=-1;
  955.         goto bailout;
  956.     }

  958.     jpeg_mem_src_tj(dinfo, jpegBuf, jpegSize);
  959.     jpeg_read_header(dinfo, TRUE);
  960.     if(setDecompDefaults(dinfo, pixelFormat, flags)==-1)
  961.     {
  962.         retval=-1; goto bailout;
  963.     }

  965.     if(flags&TJFLAG_FASTUPSAMPLE) dinfo->do_fancy_upsampling=FALSE;

  967.     jpegwidth=dinfo->image_width; jpegheight=dinfo->image_height;
  968.     if(width==0) width=jpegwidth;
  969.     if(height==0) height=jpegheight;
  970.     for(i=0; i<NUMSF; i++)
  971.     {
  972.         scaledw=TJSCALED(jpegwidth, sf[i]);
  973.         scaledh=TJSCALED(jpegheight, sf[i]);
  974.         if(scaledw<=width && scaledh<=height)
  975.                 break;
  976.     }
  977.     if(scaledw>width || scaledh>height)
  978.         _throw("tjDecompress2(): Could not scale down to desired image dimensions");
  979.     width=scaledw; height=scaledh;
  980.     dinfo->scale_num=sf[i].num;
  981.     dinfo->scale_denom=sf[i].denom;

  983.     jpeg_start_decompress(dinfo);
  984.     if(pitch==0) pitch=dinfo->output_width*tjPixelSize[pixelFormat];

  986.     #ifndef JCS_EXTENSIONS
  987.     if(pixelFormat!=TJPF_GRAY &&
  988.         (RGB_RED!=tjRedOffset[pixelFormat] ||
  989.             RGB_GREEN!=tjGreenOffset[pixelFormat] ||
  990.             RGB_BLUE!=tjBlueOffset[pixelFormat] ||
  991.             RGB_PIXELSIZE!=tjPixelSize[pixelFormat]))
  992.     {
  993.         rgbBuf=(unsigned char *)malloc(width*height*3);
  994.         if(!rgbBuf) _throw("tjDecompress2(): Memory allocation failure");
  995.         _pitch=pitch; pitch=width*3;
  996.         _dstBuf=dstBuf; dstBuf=rgbBuf;
  997.     }
  998.     #endif

  1000.     if((row_pointer=(JSAMPROW *)malloc(sizeof(JSAMPROW)
  1001.         *dinfo->output_height))==NULL)
  1002.         _throw("tjDecompress2(): Memory allocation failure");
  1003.     for(i=0; i<(int)dinfo->output_height; i++)
  1004.     {
  1005.         if(flags&TJFLAG_BOTTOMUP)
  1006.             row_pointer[i]=&dstBuf[(dinfo->output_height-i-1)*pitch];
  1007.         else row_pointer[i]=&dstBuf[i*pitch];
  1008.     }
  1009.     while(dinfo->output_scanline<dinfo->output_height)
  1010.     {
  1011.         jpeg_read_scanlines(dinfo, &row_pointer[dinfo->output_scanline],
  1012.             dinfo->output_height-dinfo->output_scanline);
  1013.     }
  1014.     jpeg_finish_decompress(dinfo);

  1016.     #ifndef JCS_EXTENSIONS
  1017.     fromRGB(rgbBuf, _dstBuf, width, _pitch, height, pixelFormat);
  1018.     #endif

  1020.     bailout:
  1021.     if(dinfo->global_state>DSTATE_START) jpeg_abort_decompress(dinfo);
  1022.     #ifndef JCS_EXTENSIONS
  1023.     if(rgbBuf) free(rgbBuf);
  1024.     #endif
  1025.     if(row_pointer) free(row_pointer);
  1026.     return retval;
  1027. }

  1029. DLLEXPORT int DLLCALL tjDecompress(tjhandle handle, unsigned char *jpegBuf,
  1030.     unsigned long jpegSize, unsigned char *dstBuf, int width, int pitch,
  1031.     int height, int pixelSize, int flags)
  1032. {
  1033.     if(flags&TJ_YUV)
  1034.         return tjDecompressToYUV(handle, jpegBuf, jpegSize, dstBuf, flags);
  1035.     else
  1036.         return tjDecompress2(handle, jpegBuf, jpegSize, dstBuf, width, pitch,
  1037.             height, getPixelFormat(pixelSize, flags), flags);
  1038. }


  1041. DLLEXPORT int DLLCALL tjDecompressToYUV(tjhandle handle,
  1042.     unsigned char *jpegBuf, unsigned long jpegSize, unsigned char *dstBuf,
  1043.     int flags)
  1044. {
  1045.     int i, row, retval=0; JSAMPROW *outbuf[MAX_COMPONENTS];
  1046.     int cw[MAX_COMPONENTS], ch[MAX_COMPONENTS], iw[MAX_COMPONENTS],
  1047.         tmpbufsize=0, usetmpbuf=0, th[MAX_COMPONENTS];
  1048.     JSAMPLE *_tmpbuf=NULL, *ptr=dstBuf; JSAMPROW *tmpbuf[MAX_COMPONENTS];

  1050.     getinstance(handle);
  1051.     if((this->init&DECOMPRESS)==0)
  1052.         _throw("tjDecompressToYUV(): Instance has not been initialized for decompression");

  1054.     for(i=0; i<MAX_COMPONENTS; i++)
  1055.     {
  1056.         tmpbuf[i]=NULL; outbuf[i]=NULL;
  1057.     }

  1059.     if(jpegBuf==NULL || jpegSize<=0 || dstBuf==NULL)
  1060.         _throw("tjDecompressToYUV(): Invalid argument");

  1062.     if(flags&TJFLAG_FORCEMMX) putenv("JSIMD_FORCEMMX=1");
  1063.     else if(flags&TJFLAG_FORCESSE) putenv("JSIMD_FORCESSE=1");
  1064.     else if(flags&TJFLAG_FORCESSE2) putenv("JSIMD_FORCESSE2=1");

  1066.     if(setjmp(this->jerr.setjmp_buffer))
  1067.     {
  1068.         /* If we get here, the JPEG code has signaled an error. */
  1069.         retval=-1;
  1070.         goto bailout;
  1071.     }

  1073.     jpeg_mem_src_tj(dinfo, jpegBuf, jpegSize);
  1074.     jpeg_read_header(dinfo, TRUE);

  1076.     for(i=0; i<dinfo->num_components; i++)
  1077.     {
  1078.         jpeg_component_info *compptr=&dinfo->comp_info[i];
  1079.         int ih;
  1080.         iw[i]=compptr->width_in_blocks*DCTSIZE;
  1081.         ih=compptr->height_in_blocks*DCTSIZE;
  1082.         cw[i]=PAD(dinfo->image_width, dinfo->max_h_samp_factor)
  1083.             *compptr->h_samp_factor/dinfo->max_h_samp_factor;
  1084.         ch[i]=PAD(dinfo->image_height, dinfo->max_v_samp_factor)
  1085.             *compptr->v_samp_factor/dinfo->max_v_samp_factor;
  1086.         if(iw[i]!=cw[i] || ih!=ch[i]) usetmpbuf=1;
  1087.         th[i]=compptr->v_samp_factor*DCTSIZE;
  1088.         tmpbufsize+=iw[i]*th[i];
  1089.         if((outbuf[i]=(JSAMPROW *)malloc(sizeof(JSAMPROW)*ch[i]))==NULL)
  1090.             _throw("tjDecompressToYUV(): Memory allocation failure");
  1091.         for(row=0; row<ch[i]; row++)
  1092.         {
  1093.             outbuf[i][row]=ptr;
  1094.             ptr+=PAD(cw[i], 4);
  1095.         }
  1096.     }
  1097.     if(usetmpbuf)
  1098.     {
  1099.         if((_tmpbuf=(JSAMPLE *)malloc(sizeof(JSAMPLE)*tmpbufsize))==NULL)
  1100.             _throw("tjDecompressToYUV(): Memory allocation failure");
  1101.         ptr=_tmpbuf;
  1102.         for(i=0; i<dinfo->num_components; i++)
  1103.         {
  1104.             if((tmpbuf[i]=(JSAMPROW *)malloc(sizeof(JSAMPROW)*th[i]))==NULL)
  1105.                 _throw("tjDecompressToYUV(): Memory allocation failure");
  1106.             for(row=0; row<th[i]; row++)
  1107.             {
  1108.                 tmpbuf[i][row]=ptr;
  1109.                 ptr+=iw[i];
  1110.             }
  1111.         }
  1112.     }

  1114.     if(flags&TJFLAG_FASTUPSAMPLE) dinfo->do_fancy_upsampling=FALSE;
  1115.     if(flags&TJFLAG_FASTDCT) dinfo->dct_method=JDCT_FASTEST;
  1116.     dinfo->raw_data_out=TRUE;

  1118.     jpeg_start_decompress(dinfo);
  1119.     for(row=0; row<(int)dinfo->output_height;
  1120.         row+=dinfo->max_v_samp_factor*DCTSIZE)
  1121.     {
  1122.         JSAMPARRAY yuvptr[MAX_COMPONENTS];
  1123.         int crow[MAX_COMPONENTS];
  1124.         for(i=0; i<dinfo->num_components; i++)
  1125.         {
  1126.             jpeg_component_info *compptr=&dinfo->comp_info[i];
  1127.             crow[i]=row*compptr->v_samp_factor/dinfo->max_v_samp_factor;
  1128.             if(usetmpbuf) yuvptr[i]=tmpbuf[i];
  1129.             else yuvptr[i]=&outbuf[i][crow[i]];
  1130.         }
  1131.         jpeg_read_raw_data(dinfo, yuvptr, dinfo->max_v_samp_factor*DCTSIZE);
  1132.         if(usetmpbuf)
  1133.         {
  1134.             int j;
  1135.             for(i=0; i<dinfo->num_components; i++)
  1136.             {
  1137.                 for(j=0; j<min(th[i], ch[i]-crow[i]); j++)
  1138.                 {
  1139.                     memcpy(outbuf[i][crow[i]+j], tmpbuf[i][j], cw[i]);
  1140.                 }
  1141.             }
  1142.         }
  1143.     }
  1144.     jpeg_finish_decompress(dinfo);

  1146.     bailout:
  1147.     if(dinfo->global_state>DSTATE_START) jpeg_abort_decompress(dinfo);
  1148.     for(i=0; i<MAX_COMPONENTS; i++)
  1149.     {
  1150.         if(tmpbuf[i]) free(tmpbuf[i]);
  1151.         if(outbuf[i]) free(outbuf[i]);
  1152.     }
  1153.     if(_tmpbuf) free(_tmpbuf);
  1154.     return retval;
  1155. }


  1158. /* Transformer */

  1160. DLLEXPORT tjhandle DLLCALL tjInitTransform(void)
  1161. {
  1162.     tjinstance *this=NULL; tjhandle handle=NULL;
  1163.     if((this=(tjinstance *)malloc(sizeof(tjinstance)))==NULL)
  1164.     {
  1165.         snprintf(errStr, JMSG_LENGTH_MAX,
  1166.             "tjInitTransform(): Memory allocation failure");
  1167.         return NULL;
  1168.     }
  1169.     MEMZERO(this, sizeof(tjinstance));
  1170.     handle=_tjInitCompress(this);
  1171.     if(!handle) return NULL;
  1172.     handle=_tjInitDecompress(this);
  1173.     return handle;
  1174. }


  1177. DLLEXPORT int DLLCALL tjTransform(tjhandle handle, unsigned char *jpegBuf,
  1178.     unsigned long jpegSize, int n, unsigned char **dstBufs,
  1179.     unsigned long *dstSizes, tjtransform *t, int flags)
  1180. {
  1181.     jpeg_transform_info *xinfo=NULL;
  1182.     jvirt_barray_ptr *srccoefs, *dstcoefs;
  1183.     int retval=0, i, jpegSubsamp;

  1185.     getinstance(handle);
  1186.     if((this->init&COMPRESS)==0 || (this->init&DECOMPRESS)==0)
  1187.         _throw("tjTransform(): Instance has not been initialized for transformation");

  1189.     if(jpegBuf==NULL || jpegSize<=0 || n<1 || dstBufs==NULL || dstSizes==NULL
  1190.         || t==NULL || flags<0)
  1191.         _throw("tjTransform(): Invalid argument");

  1193.     if(flags&TJFLAG_FORCEMMX) putenv("JSIMD_FORCEMMX=1");
  1194.     else if(flags&TJFLAG_FORCESSE) putenv("JSIMD_FORCESSE=1");
  1195.     else if(flags&TJFLAG_FORCESSE2) putenv("JSIMD_FORCESSE2=1");

  1197.     if(setjmp(this->jerr.setjmp_buffer))
  1198.     {
  1199.         /* If we get here, the JPEG code has signaled an error. */
  1200.         retval=-1;
  1201.         goto bailout;
  1202.     }

  1204.     jpeg_mem_src_tj(dinfo, jpegBuf, jpegSize);

  1206.     if((xinfo=(jpeg_transform_info *)malloc(sizeof(jpeg_transform_info)*n))
  1207.         ==NULL)
  1208.         _throw("tjTransform(): Memory allocation failure");
  1209.     MEMZERO(xinfo, sizeof(jpeg_transform_info)*n);

  1211.     for(i=0; i<n; i++)
  1212.     {
  1213.         xinfo[i].transform=xformtypes[t[i].op];
  1214.         xinfo[i].perfect=(t[i].options&TJXOPT_PERFECT)? 1:0;
  1215.         xinfo[i].trim=(t[i].options&TJXOPT_TRIM)? 1:0;
  1216.         xinfo[i].force_grayscale=(t[i].options&TJXOPT_GRAY)? 1:0;
  1217.         xinfo[i].crop=(t[i].options&TJXOPT_CROP)? 1:0;
  1218.         if(n!=1 && t[i].op==TJXOP_HFLIP) xinfo[i].slow_hflip=1;
  1219.         else xinfo[i].slow_hflip=0;

  1221.         if(xinfo[i].crop)
  1222.         {
  1223.             xinfo[i].crop_xoffset=t[i].r.x; xinfo[i].crop_xoffset_set=JCROP_POS;
  1224.             xinfo[i].crop_yoffset=t[i].r.y; xinfo[i].crop_yoffset_set=JCROP_POS;
  1225.             if(t[i].r.w!=0)
  1226.             {
  1227.                 xinfo[i].crop_width=t[i].r.w; xinfo[i].crop_width_set=JCROP_POS;
  1228.             }
  1229.             else xinfo[i].crop_width=JCROP_UNSET;
  1230.             if(t[i].r.h!=0)
  1231.             {
  1232.                 xinfo[i].crop_height=t[i].r.h; xinfo[i].crop_height_set=JCROP_POS;
  1233.             }
  1234.             else xinfo[i].crop_height=JCROP_UNSET;
  1235.         }
  1236.     }

  1238.     jcopy_markers_setup(dinfo, JCOPYOPT_ALL);
  1239.     jpeg_read_header(dinfo, TRUE);
  1240.     jpegSubsamp=getSubsamp(dinfo);
  1241.     if(jpegSubsamp<0)
  1242.         _throw("tjTransform(): Could not determine subsampling type for JPEG image");

  1244.     for(i=0; i<n; i++)
  1245.     {
  1246.         if(!jtransform_request_workspace(dinfo, &xinfo[i]))
  1247.             _throw("tjTransform(): Transform is not perfect");

  1249.         if(xinfo[i].crop)
  1250.         {
  1251.             if((t[i].r.x%xinfo[i].iMCU_sample_width)!=0
  1252.                 || (t[i].r.y%xinfo[i].iMCU_sample_height)!=0)
  1253.             {
  1254.                 snprintf(errStr, JMSG_LENGTH_MAX,
  1255.                     "To crop this JPEG image, x must be a multiple of %d\n"
  1256.                     "and y must be a multiple of %d.\n",
  1257.                     xinfo[i].iMCU_sample_width, xinfo[i].iMCU_sample_height);
  1258.                 retval=-1; goto bailout;
  1259.             }
  1260.         }
  1261.     }

  1263.     srccoefs=jpeg_read_coefficients(dinfo);

  1265.     for(i=0; i<n; i++)
  1266.     {
  1267.         int w, h, alloc=1;
  1268.         if(!xinfo[i].crop)
  1269.         {
  1270.             w=dinfo->image_width; h=dinfo->image_height;
  1271.         }
  1272.         else
  1273.         {
  1274.             w=xinfo[i].crop_width; h=xinfo[i].crop_height;
  1275.         }
  1276.         if(flags&TJFLAG_NOREALLOC)
  1277.         {
  1278.             alloc=0; dstSizes[i]=tjBufSize(w, h, jpegSubsamp);
  1279.         }
  1280.         if(!(t[i].options&TJXOPT_NOOUTPUT))
  1281.             jpeg_mem_dest_tj(cinfo, &dstBufs[i], &dstSizes[i], alloc);
  1282.         jpeg_copy_critical_parameters(dinfo, cinfo);
  1283.         dstcoefs=jtransform_adjust_parameters(dinfo, cinfo, srccoefs,
  1284.             &xinfo[i]);
  1285.         if(!(t[i].options&TJXOPT_NOOUTPUT))
  1286.         {
  1287.             jpeg_write_coefficients(cinfo, dstcoefs);
  1288.             jcopy_markers_execute(dinfo, cinfo, JCOPYOPT_ALL);
  1289.         }
  1290.         else jinit_c_master_control(cinfo, TRUE);
  1291.         jtransform_execute_transformation(dinfo, cinfo, srccoefs,
  1292.             &xinfo[i]);
  1293.         if(t[i].customFilter)
  1294.         {
  1295.             int ci, y; JDIMENSION by;
  1296.             for(ci=0; ci<cinfo->num_components; ci++)
  1297.             {
  1298.                 jpeg_component_info *compptr=&cinfo->comp_info[ci];
  1299.                 tjregion arrayRegion={0, 0, compptr->width_in_blocks*DCTSIZE,
  1300.                     DCTSIZE};
  1301.                 tjregion planeRegion={0, 0, compptr->width_in_blocks*DCTSIZE,
  1302.                     compptr->height_in_blocks*DCTSIZE};
  1303.                 for(by=0; by<compptr->height_in_blocks; by+=compptr->v_samp_factor)
  1304.                 {
  1305.                     JBLOCKARRAY barray=(dinfo->mem->access_virt_barray)
  1306.                         ((j_common_ptr)dinfo, dstcoefs[ci], by, compptr->v_samp_factor,
  1307.                         TRUE);
  1308.                     for(y=0; y<compptr->v_samp_factor; y++)
  1309.                     {
  1310.                         if(t[i].customFilter(barray[y][0], arrayRegion, planeRegion,
  1311.                             ci, i, &t[i])==-1)
  1312.                             _throw("tjTransform(): Error in custom filter");
  1313.                         arrayRegion.y+=DCTSIZE;
  1314.                     }
  1315.                 }
  1316.             }
  1317.         }
  1318.         if(!(t[i].options&TJXOPT_NOOUTPUT)) jpeg_finish_compress(cinfo);
  1319.     }

  1321.     jpeg_finish_decompress(dinfo);

  1323.     bailout:
  1324.     if(cinfo->global_state>CSTATE_START) jpeg_abort_compress(cinfo);
  1325.     if(dinfo->global_state>DSTATE_START) jpeg_abort_decompress(dinfo);
  1326.     if(xinfo) free(xinfo);
  1327.     return retval;
  1328. }

<script>window._bd_share_config={"common":{"bdSnsKey":{},"bdText":"","bdMini":"2","bdMiniList":false,"bdPic":"","bdStyle":"0","bdSize":"16"},"share":{}};with(document)0[(getElementsByTagName('head')[0]||body).appendChild(createElement('script')).src='http://bdimg.share.baidu.com/static/api/js/share.js?v=89860593.js?cdnversion='+~(-new Date()/36e5)];</script>
阅读(248) | 评论(1) | 转发(0) |
0

上一篇：VIM 配置

下一篇：关于Linux IPC的一个系列的文章

相关热门文章
给主人留下些什么吧！~~

啦哆A梦2014-02-27 09:38:08

回复 | 举报
评论热议
评论
添加红包

请填写红包祝福语或标题

个

红包个数最小为10个

元

红包金额最低5元

当前余额3.43元 前往充值 >
需支付：10.00元
成就一亿技术人!
领取后你会自动成为博主和红包主的粉丝 规则
hope_wisdom
发出的红包
实付元
使用余额支付
点击重新获取
扫码支付
钱包余额 0

抵扣说明：

1.余额是钱包充值的虚拟货币，按照1:1的比例进行支付金额的抵扣。
2.余额无法直接购买下载，可以购买VIP、付费专栏及课程。

余额充值