AOO410/main/svtools/source/filter/jpeg/jpegc.c

/**************************************************************
 * 
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 * 
 *************************************************************/

#include <stdio.h>
#include <stdlib.h>
#include "setjmp.h"
#include "jpeglib.h"
#include "jerror.h"
#include "jpeg.h"
#include "rtl/alloc.h"
#include "osl/diagnose.h"

struct my_error_mgr
{
	struct jpeg_error_mgr pub;
	jmp_buf setjmp_buffer;
};

void jpeg_svstream_src (j_decompress_ptr cinfo, void* infile);
void jpeg_svstream_dest (j_compress_ptr cinfo, void* outfile);

METHODDEF( void )
my_error_exit (j_common_ptr cinfo)
{
	my_error_ptr myerr = (my_error_ptr) cinfo->err;
	(*cinfo->err->output_message) (cinfo);
	longjmp(myerr->setjmp_buffer, 1);
}


METHODDEF( void )
my_output_message (j_common_ptr cinfo)
{
	char buffer[JMSG_LENGTH_MAX];
	(*cinfo->err->format_message) (cinfo, buffer);
}

/* TODO: when incompatible changes are possible again
   the preview size hint should be redone */
static int nPreviewWidth = 0;
static int nPreviewHeight = 0;
void SetJpegPreviewSizeHint( int nWidth, int nHeight )
{
    nPreviewWidth = nWidth;
    nPreviewHeight = nHeight;
}

void ReadJPEG( void* pJPEGReader, void* pIStm, long* pLines )
{
	struct jpeg_decompress_struct	cinfo;
	struct my_error_mgr				jerr;
    struct JPEGCreateBitmapParam    aCreateBitmapParam;
	HPBYTE							pDIB;
	HPBYTE							pTmp;
    long                            nWidth;
    long                            nHeight;
    long                            nAlignedWidth;
    JSAMPLE * range_limit;
    HPBYTE pScanLineBuffer = NULL;
    long nScanLineBufferComponents = 0;
    // declare bDecompCreated volatile because of gcc
    // warning: variable 'bDecompCreated' might be clobbered by `longjmp' or `vfork'
	volatile long					bDecompCreated = 0;

	/* Falls der Stream nicht ausreicht (IO_PENDING)
	 wird ueber ein longjmp in der Schleife nach Exit
	 gesprungen, wir geben dann die Anzahl
	 der bisher bearbeiteten Scanlines zurueck*/
	if ( setjmp( jerr.setjmp_buffer ) )
		goto Exit;

	cinfo.err = jpeg_std_error( &jerr.pub );
	jerr.pub.error_exit = my_error_exit;
	jerr.pub.output_message = my_output_message;

	jpeg_create_decompress( &cinfo );
	bDecompCreated = 1;
        jpeg_svstream_src( &cinfo, pIStm );
	jpeg_read_header( &cinfo, sal_True );

	cinfo.scale_num = 1;
	cinfo.scale_denom = 1;
	cinfo.output_gamma = 1.0;
	cinfo.raw_data_out = sal_False;
	cinfo.quantize_colors = sal_False;
	if ( cinfo.jpeg_color_space == JCS_YCbCr )
	    cinfo.out_color_space = JCS_RGB;
	else if ( cinfo.jpeg_color_space == JCS_YCCK )
	    cinfo.out_color_space = JCS_CMYK;

	OSL_ASSERT(cinfo.out_color_space == JCS_CMYK || cinfo.out_color_space == JCS_GRAYSCALE || cinfo.out_color_space == JCS_RGB);

    /* change scale for preview import */
    if( nPreviewWidth || nPreviewHeight )
    {
		if( nPreviewWidth == 0 ) {
			nPreviewWidth = ( cinfo.image_width*nPreviewHeight )/cinfo.image_height;
			if( nPreviewWidth <= 0 )
				nPreviewWidth = 1;
		} else if( nPreviewHeight == 0 ) {
			nPreviewHeight = ( cinfo.image_height*nPreviewWidth )/cinfo.image_width;
			if( nPreviewHeight <= 0 )
				nPreviewHeight = 1;
		}

        for( cinfo.scale_denom = 1; cinfo.scale_denom < 8; cinfo.scale_denom *= 2 )
        {
            if( cinfo.image_width < nPreviewWidth * cinfo.scale_denom )
                break;
            if( cinfo.image_height < nPreviewHeight * cinfo.scale_denom )
                break;
        }

        if( cinfo.scale_denom > 1 )
        {
            cinfo.dct_method            = JDCT_FASTEST;
            cinfo.do_fancy_upsampling   = sal_False;
            cinfo.do_block_smoothing    = sal_False;
        }
    }

	jpeg_start_decompress( &cinfo );

	nWidth = cinfo.output_width;
	nHeight = cinfo.output_height;
	aCreateBitmapParam.nWidth = nWidth;
	aCreateBitmapParam.nHeight = nHeight;

    aCreateBitmapParam.density_unit = cinfo.density_unit;
    aCreateBitmapParam.X_density = cinfo.X_density;
    aCreateBitmapParam.Y_density = cinfo.Y_density;
    aCreateBitmapParam.bGray = cinfo.output_components == 1;
	pDIB = CreateBitmap( pJPEGReader, &aCreateBitmapParam );
    nAlignedWidth = aCreateBitmapParam.nAlignedWidth;
    range_limit=cinfo.sample_range_limit;

	if ( cinfo.out_color_space == JCS_CMYK )
	{
    		nScanLineBufferComponents = cinfo.output_width * 4;
		pScanLineBuffer = rtl_allocateMemory( nScanLineBufferComponents );
	}

	if( pDIB )
	{
		if( aCreateBitmapParam.bTopDown )
			pTmp = pDIB;
		else
		{
			pTmp = pDIB + ( nHeight - 1 ) * nAlignedWidth;
			nAlignedWidth = -nAlignedWidth;
		}

		for ( *pLines = 0; *pLines < nHeight; (*pLines)++ )
		{
		    if (pScanLineBuffer!=NULL) { // in other words cinfo.out_color_space == JCS_CMYK
			int i;
			int j;
			jpeg_read_scanlines( &cinfo, (JSAMPARRAY) &pScanLineBuffer, 1 );
			// convert CMYK to RGB
			for( i=0, j=0; i < nScanLineBufferComponents; i+=4, j+=3 )
			{
			    int c_=255-pScanLineBuffer[i+0];
			    int m_=255-pScanLineBuffer[i+1];
			    int y_=255-pScanLineBuffer[i+2];
			    int k_=255-pScanLineBuffer[i+3];
			    pTmp[j+0]=range_limit[ 255L - ( c_ + k_ ) ];
			    pTmp[j+1]=range_limit[ 255L - ( m_ + k_ ) ];
			    pTmp[j+2]=range_limit[ 255L - ( y_ + k_ ) ];
			}
		    } else {
			jpeg_read_scanlines( &cinfo, (JSAMPARRAY) &pTmp, 1 );
		    }
		    /* PENDING ??? */
		    if ( cinfo.err->msg_code == 113 )
			break;
		    
		    pTmp += nAlignedWidth;
		}
	}

    if ( pDIB )
    {
        jpeg_finish_decompress( &cinfo );
    }
    else
    {
        jpeg_abort_decompress( &cinfo );
    }

	if (pScanLineBuffer!=NULL) {
	    rtl_freeMemory( pScanLineBuffer );
	    pScanLineBuffer=NULL;
	}

Exit:

	if( bDecompCreated )
		jpeg_destroy_decompress( &cinfo );
}

long WriteJPEG( void* pJPEGWriter, void* pOStm,
				long nWidth, long nHeight, long bGreys,
				long nQualityPercent, void* pCallbackData )
{
	struct jpeg_compress_struct	cinfo;
	struct my_error_mgr			jerr;
	void*						pScanline;
	long						nY;
    // declare bCompCreated, bRet volatile because of gcc
    // warning: variable 'bCompCreated' might be clobbered by `longjmp' or `vfork'
	volatile long				bCompCreated = 0;
	volatile long				bRet = 0;

	if ( setjmp( jerr.setjmp_buffer ) )
		goto Exit;

	cinfo.err = jpeg_std_error( &jerr.pub );
	jerr.pub.error_exit = my_error_exit;
	jerr.pub.output_message = my_output_message;

	jpeg_create_compress( &cinfo );
	bCompCreated = 1;

	jpeg_svstream_dest( &cinfo, pOStm );

	cinfo.image_width = (JDIMENSION) nWidth;
	cinfo.image_height = (JDIMENSION) nHeight;
	if ( bGreys )
	{
		cinfo.input_components = 1;
		cinfo.in_color_space = JCS_GRAYSCALE;
	}
	else
	{
		cinfo.input_components = 3;
		cinfo.in_color_space = JCS_RGB;
	}

	jpeg_set_defaults( &cinfo );
	jpeg_set_quality( &cinfo, (int) nQualityPercent, sal_False );

	if ( ( nWidth > 128 ) || ( nHeight > 128 ) )
		jpeg_simple_progression( &cinfo );

	jpeg_start_compress( &cinfo, sal_True );

	for( nY = 0; nY < nHeight; nY++ )
	{
		pScanline = GetScanline( pJPEGWriter, nY );

		if( pScanline )
			jpeg_write_scanlines( &cinfo, (JSAMPARRAY) &pScanline, 1 );

		if( JPEGCallback( pCallbackData, nY * 100L / nHeight ) )
			goto Exit;
	}

	bRet = 1;

	jpeg_finish_compress(&cinfo);

Exit:

	if ( bCompCreated )
		jpeg_destroy_compress( &cinfo );

	return bRet;
}