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turbojpeg-jni.c

/*
 * Copyright (C)2011 D. R. Commander.  All Rights Reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * - Redistributions of source code must retain the above copyright notice,
 *   this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright notice,
 *   this list of conditions and the following disclaimer in the documentation
 *   and/or other materials provided with the distribution.
 * - Neither the name of the libjpeg-turbo Project nor the names of its
 *   contributors may be used to endorse or promote products derived from this
 *   software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS",
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <stdlib.h>
#include <string.h>
#include "turbojpeg.h"
#include <jni.h>
#include "java/org_libjpegturbo_turbojpeg_TJCompressor.h"
#include "java/org_libjpegturbo_turbojpeg_TJDecompressor.h"
#include "java/org_libjpegturbo_turbojpeg_TJ.h"

#define _throw(msg) {  \
      jclass _exccls=(*env)->FindClass(env, "java/lang/Exception");  \
      if(!_exccls) goto bailout;  \
      (*env)->ThrowNew(env, _exccls, msg);  \
      goto bailout;  \
}

#define bailif0(f) {if(!(f)) goto bailout;}

#define gethandle()  \
      jclass _cls=(*env)->GetObjectClass(env, obj);  \
      jfieldID _fid;  \
      if(!_cls) goto bailout;  \
      bailif0(_fid=(*env)->GetFieldID(env, _cls, "handle", "J"));  \
      handle=(tjhandle)(jlong)(*env)->GetLongField(env, obj, _fid);  \

JNIEXPORT jint JNICALL Java_org_libjpegturbo_turbojpeg_TJ_bufSize
      (JNIEnv *env, jclass cls, jint width, jint height, jint jpegSubsamp)
{
      jint retval=(jint)tjBufSize(width, height, jpegSubsamp);
      if(retval==-1) _throw(tjGetErrorStr());

      bailout:
      return retval;
}

JNIEXPORT jint JNICALL Java_org_libjpegturbo_turbojpeg_TJ_bufSizeYUV
      (JNIEnv *env, jclass cls, jint width, jint height, jint subsamp)
{
      jint retval=(jint)tjBufSizeYUV(width, height, subsamp);
      if(retval==-1) _throw(tjGetErrorStr());

      bailout:
      return retval;
}

JNIEXPORT void JNICALL Java_org_libjpegturbo_turbojpeg_TJCompressor_init
      (JNIEnv *env, jobject obj)
{
      jclass cls;
      jfieldID fid;
      tjhandle handle;

      if((handle=tjInitCompress())==NULL)
            _throw(tjGetErrorStr());

      bailif0(cls=(*env)->GetObjectClass(env, obj));
      bailif0(fid=(*env)->GetFieldID(env, cls, "handle", "J"));
      (*env)->SetLongField(env, obj, fid, (jlong)handle);

      bailout:
      return;
}

JNIEXPORT jint JNICALL Java_org_libjpegturbo_turbojpeg_TJCompressor_compress___3BIIII_3BIII
      (JNIEnv *env, jobject obj, jbyteArray src, jint width, jint pitch,
            jint height, jint pf, jbyteArray dst, jint jpegSubsamp, jint jpegQual,
            jint flags)
{
      tjhandle handle=0;
      unsigned long jpegSize=0;  jsize arraySize=0;
      unsigned char *srcBuf=NULL, *jpegBuf=NULL;

      gethandle();

      if(pf<0 || pf>=org_libjpegturbo_turbojpeg_TJ_NUMPF || width<1 || height<1
            || pitch<0)
            _throw("Invalid argument in compress()");
      if(org_libjpegturbo_turbojpeg_TJ_NUMPF!=TJ_NUMPF)
            _throw("Mismatch between Java and C API");

      arraySize=(pitch==0)? width*tjPixelSize[pf]*height:pitch*height;
      if((*env)->GetArrayLength(env, src)<arraySize)
            _throw("Source buffer is not large enough");
      jpegSize=tjBufSize(width, height, jpegSubsamp);
      if((*env)->GetArrayLength(env, dst)<(jsize)jpegSize)
            _throw("Destination buffer is not large enough");

      bailif0(srcBuf=(*env)->GetPrimitiveArrayCritical(env, src, 0));
      bailif0(jpegBuf=(*env)->GetPrimitiveArrayCritical(env, dst, 0));

      if(tjCompress2(handle, srcBuf, width, pitch, height, pf, &jpegBuf,
            &jpegSize, jpegSubsamp, jpegQual, flags|TJFLAG_NOREALLOC)==-1)
      {
            (*env)->ReleasePrimitiveArrayCritical(env, dst, jpegBuf, 0);
            (*env)->ReleasePrimitiveArrayCritical(env, src, srcBuf, 0);
            jpegBuf=srcBuf=NULL;
            _throw(tjGetErrorStr());
      }

      bailout:
      if(jpegBuf) (*env)->ReleasePrimitiveArrayCritical(env, dst, jpegBuf, 0);
      if(srcBuf) (*env)->ReleasePrimitiveArrayCritical(env, src, srcBuf, 0);
      return (jint)jpegSize;
}

JNIEXPORT jint JNICALL Java_org_libjpegturbo_turbojpeg_TJCompressor_compress___3IIIII_3BIII
      (JNIEnv *env, jobject obj, jintArray src, jint width, jint pitch,
            jint height, jint pf, jbyteArray dst, jint jpegSubsamp, jint jpegQual,
            jint flags)
{
      tjhandle handle=0;
      unsigned long jpegSize=0;  jsize arraySize=0;
      unsigned char *srcBuf=NULL, *jpegBuf=NULL;

      gethandle();

      if(pf<0 || pf>=org_libjpegturbo_turbojpeg_TJ_NUMPF || width<1 || height<1
            || pitch<0)
            _throw("Invalid argument in compress()");
      if(org_libjpegturbo_turbojpeg_TJ_NUMPF!=TJ_NUMPF)
            _throw("Mismatch between Java and C API");
      if(tjPixelSize[pf]!=sizeof(jint))
            _throw("Pixel format must be 32-bit when compressing from an integer buffer.");

      arraySize=(pitch==0)? width*height:pitch*height;
      if((*env)->GetArrayLength(env, src)<arraySize)
            _throw("Source buffer is not large enough");
      jpegSize=tjBufSize(width, height, jpegSubsamp);
      if((*env)->GetArrayLength(env, dst)<(jsize)jpegSize)
            _throw("Destination buffer is not large enough");

      bailif0(srcBuf=(*env)->GetPrimitiveArrayCritical(env, src, 0));
      bailif0(jpegBuf=(*env)->GetPrimitiveArrayCritical(env, dst, 0));

      if(tjCompress2(handle, srcBuf, width, pitch*sizeof(jint), height, pf,
            &jpegBuf, &jpegSize, jpegSubsamp, jpegQual, flags|TJFLAG_NOREALLOC)==-1)
      {
            (*env)->ReleasePrimitiveArrayCritical(env, dst, jpegBuf, 0);
            (*env)->ReleasePrimitiveArrayCritical(env, src, srcBuf, 0);
            jpegBuf=srcBuf=NULL;
            _throw(tjGetErrorStr());
      }

      bailout:
      if(jpegBuf) (*env)->ReleasePrimitiveArrayCritical(env, dst, jpegBuf, 0);
      if(srcBuf) (*env)->ReleasePrimitiveArrayCritical(env, src, srcBuf, 0);
      return (jint)jpegSize;
}

JNIEXPORT void JNICALL Java_org_libjpegturbo_turbojpeg_TJCompressor_encodeYUV___3BIIII_3BII
      (JNIEnv *env, jobject obj, jbyteArray src, jint width, jint pitch,
            jint height, jint pf, jbyteArray dst, jint subsamp, jint flags)
{
      tjhandle handle=0;
      jsize arraySize=0;
      unsigned char *srcBuf=NULL, *dstBuf=NULL;

      gethandle();

      if(pf<0 || pf>=org_libjpegturbo_turbojpeg_TJ_NUMPF || width<1 || height<1
            || pitch<0)
            _throw("Invalid argument in encodeYUV()");
      if(org_libjpegturbo_turbojpeg_TJ_NUMPF!=TJ_NUMPF)
            _throw("Mismatch between Java and C API");

      arraySize=(pitch==0)? width*tjPixelSize[pf]*height:pitch*height;
      if((*env)->GetArrayLength(env, src)<arraySize)
            _throw("Source buffer is not large enough");
      if((*env)->GetArrayLength(env, dst)
            <(jsize)tjBufSizeYUV(width, height, subsamp))
            _throw("Destination buffer is not large enough");

      bailif0(srcBuf=(*env)->GetPrimitiveArrayCritical(env, src, 0));
      bailif0(dstBuf=(*env)->GetPrimitiveArrayCritical(env, dst, 0));

      if(tjEncodeYUV2(handle, srcBuf, width, pitch, height, pf, dstBuf, subsamp,
            flags)==-1)
      {
            (*env)->ReleasePrimitiveArrayCritical(env, dst, dstBuf, 0);
            (*env)->ReleasePrimitiveArrayCritical(env, src, srcBuf, 0);
            dstBuf=srcBuf=NULL;
            _throw(tjGetErrorStr());
      }

      bailout:
      if(dstBuf) (*env)->ReleasePrimitiveArrayCritical(env, dst, dstBuf, 0);
      if(srcBuf) (*env)->ReleasePrimitiveArrayCritical(env, src, srcBuf, 0);
      return;
}

JNIEXPORT void JNICALL Java_org_libjpegturbo_turbojpeg_TJCompressor_encodeYUV___3IIIII_3BII
      (JNIEnv *env, jobject obj, jintArray src, jint width, jint pitch,
            jint height, jint pf, jbyteArray dst, jint subsamp, jint flags)
{
      tjhandle handle=0;
      jsize arraySize=0;
      unsigned char *srcBuf=NULL, *dstBuf=NULL;

      gethandle();

      if(pf<0 || pf>=org_libjpegturbo_turbojpeg_TJ_NUMPF || width<1 || height<1
            || pitch<0)
            _throw("Invalid argument in compress()");
      if(org_libjpegturbo_turbojpeg_TJ_NUMPF!=TJ_NUMPF)
            _throw("Mismatch between Java and C API");
      if(tjPixelSize[pf]!=sizeof(jint))
            _throw("Pixel format must be 32-bit when encoding from an integer buffer.");

      arraySize=(pitch==0)? width*height:pitch*height;
      if((*env)->GetArrayLength(env, src)<arraySize)
            _throw("Source buffer is not large enough");
      if((*env)->GetArrayLength(env, dst)
            <(jsize)tjBufSizeYUV(width, height, subsamp))
            _throw("Destination buffer is not large enough");

      bailif0(srcBuf=(*env)->GetPrimitiveArrayCritical(env, src, 0));
      bailif0(dstBuf=(*env)->GetPrimitiveArrayCritical(env, dst, 0));

      if(tjEncodeYUV2(handle, srcBuf, width, pitch*sizeof(jint), height, pf,
            dstBuf, subsamp, flags)==-1)
      {
            (*env)->ReleasePrimitiveArrayCritical(env, dst, dstBuf, 0);
            (*env)->ReleasePrimitiveArrayCritical(env, src, srcBuf, 0);
            dstBuf=srcBuf=NULL;
            _throw(tjGetErrorStr());
      }

      bailout:
      if(dstBuf) (*env)->ReleasePrimitiveArrayCritical(env, dst, dstBuf, 0);
      if(srcBuf) (*env)->ReleasePrimitiveArrayCritical(env, src, srcBuf, 0);
      return;
}

JNIEXPORT void JNICALL Java_org_libjpegturbo_turbojpeg_TJCompressor_destroy
      (JNIEnv *env, jobject obj)
{
      tjhandle handle=0;

      gethandle();

      if(tjDestroy(handle)==-1) _throw(tjGetErrorStr());
      (*env)->SetLongField(env, obj, _fid, 0);

      bailout:
      return;
}

JNIEXPORT void JNICALL Java_org_libjpegturbo_turbojpeg_TJDecompressor_init
      (JNIEnv *env, jobject obj)
{
      jclass cls;
      jfieldID fid;
      tjhandle handle;

      if((handle=tjInitDecompress())==NULL) _throw(tjGetErrorStr());

      bailif0(cls=(*env)->GetObjectClass(env, obj));
      bailif0(fid=(*env)->GetFieldID(env, cls, "handle", "J"));
      (*env)->SetLongField(env, obj, fid, (jlong)handle);

      bailout:
      return;
}

JNIEXPORT jobjectArray JNICALL Java_org_libjpegturbo_turbojpeg_TJ_getScalingFactors
      (JNIEnv *env, jclass cls)
{
  jclass sfcls=NULL;  jfieldID fid=0;
      tjscalingfactor *sf=NULL;  int n=0, i;
      jobject sfobj=NULL;
      jobjectArray sfjava=NULL;

      if((sf=tjGetScalingFactors(&n))==NULL || n==0)
            _throw(tjGetErrorStr());

      bailif0(sfcls=(*env)->FindClass(env, "org/libjpegturbo/turbojpeg/TJScalingFactor"));
      bailif0(sfjava=(jobjectArray)(*env)->NewObjectArray(env, n, sfcls, 0));

      for(i=0; i<n; i++)
      {
            bailif0(sfobj=(*env)->AllocObject(env, sfcls));
            bailif0(fid=(*env)->GetFieldID(env, sfcls, "num", "I"));
            (*env)->SetIntField(env, sfobj, fid, sf[i].num);
            bailif0(fid=(*env)->GetFieldID(env, sfcls, "denom", "I"));
            (*env)->SetIntField(env, sfobj, fid, sf[i].denom);
            (*env)->SetObjectArrayElement(env, sfjava, i, sfobj);
      }

      bailout:
      return sfjava;
}

JNIEXPORT void JNICALL Java_org_libjpegturbo_turbojpeg_TJDecompressor_decompressHeader
      (JNIEnv *env, jobject obj, jbyteArray src, jint jpegSize)
{
      tjhandle handle=0;
      unsigned char *jpegBuf=NULL;
      int width=0, height=0, jpegSubsamp=-1;

      gethandle();

      if((*env)->GetArrayLength(env, src)<jpegSize)
            _throw("Source buffer is not large enough");

      bailif0(jpegBuf=(*env)->GetPrimitiveArrayCritical(env, src, 0));

      if(tjDecompressHeader2(handle, jpegBuf, (unsigned long)jpegSize, 
            &width, &height, &jpegSubsamp)==-1)
      {
            (*env)->ReleasePrimitiveArrayCritical(env, src, jpegBuf, 0);
            _throw(tjGetErrorStr());
      }
      (*env)->ReleasePrimitiveArrayCritical(env, src, jpegBuf, 0);  jpegBuf=NULL;

      bailif0(_fid=(*env)->GetFieldID(env, _cls, "jpegSubsamp", "I"));
      (*env)->SetIntField(env, obj, _fid, jpegSubsamp);
      bailif0(_fid=(*env)->GetFieldID(env, _cls, "jpegWidth", "I"));
      (*env)->SetIntField(env, obj, _fid, width);
      bailif0(_fid=(*env)->GetFieldID(env, _cls, "jpegHeight", "I"));
      (*env)->SetIntField(env, obj, _fid, height);

      bailout:
      return;
}

JNIEXPORT void JNICALL Java_org_libjpegturbo_turbojpeg_TJDecompressor_decompress___3BI_3BIIIII
      (JNIEnv *env, jobject obj, jbyteArray src, jint jpegSize, jbyteArray dst,
            jint width, jint pitch, jint height, jint pf, jint flags)
{
      tjhandle handle=0;
      jsize arraySize=0;
      unsigned char *jpegBuf=NULL, *dstBuf=NULL;

      gethandle();

      if(pf<0 || pf>=org_libjpegturbo_turbojpeg_TJ_NUMPF)
            _throw("Invalid argument in decompress()");
      if(org_libjpegturbo_turbojpeg_TJ_NUMPF!=TJ_NUMPF)
            _throw("Mismatch between Java and C API");

      if((*env)->GetArrayLength(env, src)<jpegSize)
            _throw("Source buffer is not large enough");
      arraySize=(pitch==0)? width*tjPixelSize[pf]*height:pitch*height;
      if((*env)->GetArrayLength(env, dst)<arraySize)
            _throw("Destination buffer is not large enough");

      bailif0(jpegBuf=(*env)->GetPrimitiveArrayCritical(env, src, 0));
      bailif0(dstBuf=(*env)->GetPrimitiveArrayCritical(env, dst, 0));

      if(tjDecompress2(handle, jpegBuf, (unsigned long)jpegSize, dstBuf, width,
            pitch, height, pf, flags)==-1)
      {
            (*env)->ReleasePrimitiveArrayCritical(env, dst, dstBuf, 0);
            (*env)->ReleasePrimitiveArrayCritical(env, src, jpegBuf, 0);
            dstBuf=jpegBuf=NULL;
            _throw(tjGetErrorStr());
      }

      bailout:
      if(dstBuf) (*env)->ReleasePrimitiveArrayCritical(env, dst, dstBuf, 0);
      if(jpegBuf) (*env)->ReleasePrimitiveArrayCritical(env, src, jpegBuf, 0);
      return;
}

JNIEXPORT void JNICALL Java_org_libjpegturbo_turbojpeg_TJDecompressor_decompress___3BI_3IIIIII
      (JNIEnv *env, jobject obj, jbyteArray src, jint jpegSize, jintArray dst,
            jint width, jint pitch, jint height, jint pf, jint flags)
{
      tjhandle handle=0;
      jsize arraySize=0;
      unsigned char *jpegBuf=NULL, *dstBuf=NULL;

      gethandle();

      if(pf<0 || pf>=org_libjpegturbo_turbojpeg_TJ_NUMPF)
            _throw("Invalid argument in decompress()");
      if(org_libjpegturbo_turbojpeg_TJ_NUMPF!=TJ_NUMPF)
            _throw("Mismatch between Java and C API");
      if(tjPixelSize[pf]!=sizeof(jint))
            _throw("Pixel format must be 32-bit when decompressing to an integer buffer.");

      if((*env)->GetArrayLength(env, src)<jpegSize)
            _throw("Source buffer is not large enough");
      arraySize=(pitch==0)? width*height:pitch*height;
      if((*env)->GetArrayLength(env, dst)<arraySize)
            _throw("Destination buffer is not large enough");

      bailif0(jpegBuf=(*env)->GetPrimitiveArrayCritical(env, src, 0));
      bailif0(dstBuf=(*env)->GetPrimitiveArrayCritical(env, dst, 0));

      if(tjDecompress2(handle, jpegBuf, (unsigned long)jpegSize, dstBuf, width,
            pitch*sizeof(jint), height, pf, flags)==-1)
      {
            (*env)->ReleasePrimitiveArrayCritical(env, dst, dstBuf, 0);
            (*env)->ReleasePrimitiveArrayCritical(env, src, jpegBuf, 0);
            dstBuf=jpegBuf=NULL;
            _throw(tjGetErrorStr());
      }

      bailout:
      if(dstBuf) (*env)->ReleasePrimitiveArrayCritical(env, dst, dstBuf, 0);
      if(jpegBuf) (*env)->ReleasePrimitiveArrayCritical(env, src, jpegBuf, 0);
      return;
}

JNIEXPORT void JNICALL Java_org_libjpegturbo_turbojpeg_TJDecompressor_decompressToYUV
      (JNIEnv *env, jobject obj, jbyteArray src, jint jpegSize, jbyteArray dst,
            jint flags)
{
      tjhandle handle=0;
      unsigned char *jpegBuf=NULL, *dstBuf=NULL;
      int jpegSubsamp=-1, jpegWidth=0, jpegHeight=0;

      gethandle();

      if((*env)->GetArrayLength(env, src)<jpegSize)
            _throw("Source buffer is not large enough");
      bailif0(_fid=(*env)->GetFieldID(env, _cls, "jpegSubsamp", "I"));
      jpegSubsamp=(int)(*env)->GetIntField(env, obj, _fid);
      bailif0(_fid=(*env)->GetFieldID(env, _cls, "jpegWidth", "I"));
      jpegWidth=(int)(*env)->GetIntField(env, obj, _fid);
      bailif0(_fid=(*env)->GetFieldID(env, _cls, "jpegHeight", "I"));
      jpegHeight=(int)(*env)->GetIntField(env, obj, _fid);
      if((*env)->GetArrayLength(env, dst)
            <(jsize)tjBufSizeYUV(jpegWidth, jpegHeight, jpegSubsamp))
            _throw("Destination buffer is not large enough");

      bailif0(jpegBuf=(*env)->GetPrimitiveArrayCritical(env, src, 0));
      bailif0(dstBuf=(*env)->GetPrimitiveArrayCritical(env, dst, 0));

      if(tjDecompressToYUV(handle, jpegBuf, (unsigned long)jpegSize, dstBuf,
            flags)==-1)
      {
            (*env)->ReleasePrimitiveArrayCritical(env, dst, dstBuf, 0);
            (*env)->ReleasePrimitiveArrayCritical(env, src, jpegBuf, 0);
            dstBuf=jpegBuf=NULL;
            _throw(tjGetErrorStr());
      }

      bailout:
      if(dstBuf) (*env)->ReleasePrimitiveArrayCritical(env, dst, dstBuf, 0);
      if(jpegBuf) (*env)->ReleasePrimitiveArrayCritical(env, src, jpegBuf, 0);
      return;
}

JNIEXPORT void JNICALL Java_org_libjpegturbo_turbojpeg_TJTransformer_init
      (JNIEnv *env, jobject obj)
{
      jclass cls;
      jfieldID fid;
      tjhandle handle;

      if((handle=tjInitTransform())==NULL) _throw(tjGetErrorStr());

      bailif0(cls=(*env)->GetObjectClass(env, obj));
      bailif0(fid=(*env)->GetFieldID(env, cls, "handle", "J"));
      (*env)->SetLongField(env, obj, fid, (jlong)handle);

      bailout:
      return;
}

JNIEXPORT jintArray JNICALL Java_org_libjpegturbo_turbojpeg_TJTransformer_transform
      (JNIEnv *env, jobject obj, jbyteArray jsrcBuf, jint jpegSize,
            jobjectArray dstobjs, jobjectArray tobjs, jint flags)
{
      tjhandle handle=0;  int i;
      unsigned char *jpegBuf=NULL, **dstBufs=NULL;  jsize n=0;
      unsigned long *dstSizes=NULL;  tjtransform *t=NULL;
      jbyteArray *jdstBufs=NULL;
      int jpegWidth=0, jpegHeight=0, jpegSubsamp;
      jintArray jdstSizes=0;  jint *dstSizesi=NULL;

      gethandle();

      if((*env)->GetArrayLength(env, jsrcBuf)<jpegSize)
            _throw("Source buffer is not large enough");
      bailif0(_fid=(*env)->GetFieldID(env, _cls, "jpegWidth", "I"));
      jpegWidth=(int)(*env)->GetIntField(env, obj, _fid);
      bailif0(_fid=(*env)->GetFieldID(env, _cls, "jpegHeight", "I"));
      jpegHeight=(int)(*env)->GetIntField(env, obj, _fid);
      bailif0(_fid=(*env)->GetFieldID(env, _cls, "jpegSubsamp", "I"));
      jpegSubsamp=(int)(*env)->GetIntField(env, obj, _fid);

      n=(*env)->GetArrayLength(env, dstobjs);
      if(n!=(*env)->GetArrayLength(env, tobjs))
            _throw("Mismatch between size of transforms array and destination buffers array");

      if((dstBufs=(unsigned char **)malloc(sizeof(unsigned char *)*n))==NULL)
            _throw("Memory allocation failure");
      if((jdstBufs=(jbyteArray *)malloc(sizeof(jbyteArray)*n))==NULL)
            _throw("Memory allocation failure");
      if((dstSizes=(unsigned long *)malloc(sizeof(unsigned long)*n))==NULL)
            _throw("Memory allocation failure");
      if((t=(tjtransform *)malloc(sizeof(tjtransform)*n))==NULL)
            _throw("Memory allocation failure");
      for(i=0; i<n; i++)
      {
            dstBufs[i]=NULL;  jdstBufs[i]=NULL;  dstSizes[i]=0;
            memset(&t[i], 0, sizeof(tjtransform));
      }

      for(i=0; i<n; i++)
      {
            jobject tobj;

            bailif0(tobj=(*env)->GetObjectArrayElement(env, tobjs, i));
            bailif0(_cls=(*env)->GetObjectClass(env, tobj));
            bailif0(_fid=(*env)->GetFieldID(env, _cls, "op", "I"));
            t[i].op=(*env)->GetIntField(env, tobj, _fid);
            bailif0(_fid=(*env)->GetFieldID(env, _cls, "options", "I"));
            t[i].options=(*env)->GetIntField(env, tobj, _fid);
            bailif0(_fid=(*env)->GetFieldID(env, _cls, "x", "I"));
            t[i].r.x=(*env)->GetIntField(env, tobj, _fid);
            bailif0(_fid=(*env)->GetFieldID(env, _cls, "y", "I"));
            t[i].r.y=(*env)->GetIntField(env, tobj, _fid);
            bailif0(_fid=(*env)->GetFieldID(env, _cls, "width", "I"));
            t[i].r.w=(*env)->GetIntField(env, tobj, _fid);
            bailif0(_fid=(*env)->GetFieldID(env, _cls, "height", "I"));
            t[i].r.h=(*env)->GetIntField(env, tobj, _fid);
      }

      bailif0(jpegBuf=(*env)->GetPrimitiveArrayCritical(env, jsrcBuf, 0));
      for(i=0; i<n; i++)
      {
            int w=jpegWidth, h=jpegHeight;
            if(t[i].r.w!=0) w=t[i].r.w;
            if(t[i].r.h!=0) h=t[i].r.h;
            bailif0(jdstBufs[i]=(*env)->GetObjectArrayElement(env, dstobjs, i));
            if((*env)->GetArrayLength(env, jdstBufs[i])<tjBufSize(w, h, jpegSubsamp))
                  _throw("Destination buffer is not large enough");
            bailif0(dstBufs[i]=(*env)->GetPrimitiveArrayCritical(env, jdstBufs[i], 0));
      }

      if(tjTransform(handle, jpegBuf, jpegSize, n, dstBufs, dstSizes, t,
            flags|TJFLAG_NOREALLOC)==-1)
      {
            (*env)->ReleasePrimitiveArrayCritical(env, jsrcBuf, jpegBuf, 0);
            jpegBuf=NULL;
            for(i=0; i<n; i++)
            {
                  (*env)->ReleasePrimitiveArrayCritical(env, jdstBufs[i], dstBufs[i], 0);
                  dstBufs[i]=NULL;
            }
            _throw(tjGetErrorStr());
      }

      jdstSizes=(*env)->NewIntArray(env, n);
      bailif0(dstSizesi=(*env)->GetIntArrayElements(env, jdstSizes, 0));
      for(i=0; i<n; i++) dstSizesi[i]=(int)dstSizes[i];

      bailout:
      if(jpegBuf) (*env)->ReleasePrimitiveArrayCritical(env, jsrcBuf, jpegBuf, 0);
      if(dstBufs)
      {
            for(i=0; i<n; i++)
            {
                  if(dstBufs[i] && jdstBufs && jdstBufs[i])
                        (*env)->ReleasePrimitiveArrayCritical(env, jdstBufs[i], dstBufs[i], 0);
            }
            free(dstBufs);
      }
      if(jdstBufs) free(jdstBufs);
      if(dstSizes) free(dstSizes);
      if(dstSizesi) (*env)->ReleaseIntArrayElements(env, jdstSizes, dstSizesi, 0);
      if(t) free(t);
      return jdstSizes;
}

JNIEXPORT void JNICALL Java_org_libjpegturbo_turbojpeg_TJDecompressor_destroy
      (JNIEnv *env, jobject obj)
{
      Java_org_libjpegturbo_turbojpeg_TJCompressor_destroy(env, obj);
}

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