// $Id: jpgdest.cpp 1282 2006-06-09 09:46:49Z alex $ /* @@tag:xara-cn@@ DO NOT MODIFY THIS LINE ================================XARAHEADERSTART=========================== Xara LX, a vector drawing and manipulation program. Copyright (C) 1993-2006 Xara Group Ltd. Copyright on certain contributions may be held in joint with their respective authors. See AUTHORS file for details. LICENSE TO USE AND MODIFY SOFTWARE ---------------------------------- This file is part of Xara LX. Xara LX is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License version 2 as published by the Free Software Foundation. Xara LX and its component source files are distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 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Xara Group Ltd, Gaddesden Place, Hemel Hempstead, HP2 6EX, UK. http://www.xara.com/ =================================XARAHEADEREND============================ */ // #include "camtypes.h" //#include "ccfile.h" - in camtypes.h [AUTOMATICALLY REMOVED] //#include "jinclude.h" #include "jpglib_namespace.h" #include "jpgermgr.h" //#include "errors.h" - in camtypes.h [AUTOMATICALLY REMOVED] //#include "tim.h" // for _R(IDE_FILE_WRITE_ERROR) #include "jpgdest.h" // Place any IMPLEMENT type statements here CC_IMPLEMENT_MEMDUMP(JPEGDataDestination, CC_CLASS_MEMDUMP) // We want better memory tracking #define new CAM_DEBUG_NEW // Functions follow /******************************************************************************************** > JPEGDataDestination::JPEGDataDestination(j_compress_ptr cinfo, CCFile* pOutputFile) Author: Colin_Barfoot (Xara Group Ltd) Created: 29/10/96 Inputs: pOutputFile : a pointer to a CCFile providing the destination for the JPEG output Purpose: Default constructor ********************************************************************************************/ JPEGDataDestination::JPEGDataDestination(CCFile* pOutputFile) { ERROR3IF(pOutputFile == NULL || !pOutputFile->IS_KIND_OF(CCFile), "pOutputFile isn't"); m_DestMgr.pThis = this; m_DestMgr.init_destination = InitDestination; m_DestMgr.empty_output_buffer = EmptyOutputBuffer; m_DestMgr.term_destination = TerminateDestination; m_pOutputFile = pOutputFile; m_pBuffer = NULL; } /******************************************************************************************** > BOOL JPEGDataDestination::Init(j_compress_ptr cinfo) Author: Colin_Barfoot (Xara Group Ltd) Created: 29/10/96 Inputs: cinfo : a pointer to the IJG compression structure Purpose: Initializes the given compression structure with this JPEGDataDestination ********************************************************************************************/ BOOL JPEGDataDestination::Init(libJPEG::j_compress_ptr cinfo) { ERROR3IF(cinfo == NULL, "cinfo NULL"); cinfo->dest = &m_DestMgr; return TRUE; } /******************************************************************************************** > void JPEGDataDestination::InitDestination(j_compress_ptr cinfo) Author: Colin_Barfoot (Xara Group Ltd) Created: 29/10/96 Inputs: cinfo : a pointer to the IJG compression control structure Purpose: Callback for IJG destination file handler Initialize destination --- called by jpeg_start_compress before any data is actually written. ********************************************************************************************/ void JPEGDataDestination::InitDestination(libJPEG::j_compress_ptr cinfo) { using namespace libJPEG; JPEGDataDestination* pThis = GetThis(cinfo); /* Allocate the output buffer --- it will be released when done with image */ pThis->m_pBuffer = (JOCTET *)(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, OUTPUT_BUF_SIZE * sizeof(JOCTET)); pThis->m_DestMgr.next_output_byte = pThis->m_pBuffer; pThis->m_DestMgr.free_in_buffer = OUTPUT_BUF_SIZE; } /******************************************************************************************** > boolean JPEGDataDestination::EmptyOutputBuffer(j_compress_ptr cinfo) Author: Colin_Barfoot (Xara Group Ltd) Created: 29/10/96 Inputs: cinfo : a pointer to the IJG compression control structure Purpose: Callback for IJG destination file handler Empty the output buffer --- called whenever buffer fills up. Notes: Says IJG docs, "In typical applications, this should write the entire output buffer (ignoring the current state of next_output_byte & free_in_buffer), reset the pointer & count to the start of the buffer, and return TRUE indicating that the buffer has been dumped." Scope: static ********************************************************************************************/ libJPEG::boolean JPEGDataDestination::EmptyOutputBuffer(libJPEG::j_compress_ptr cinfo) { JPEGDataDestination* pThis = GetThis(cinfo); CCFile* pFile = pThis->GetFile(); // Write out the full buffer pFile->write(pThis->m_pBuffer, OUTPUT_BUF_SIZE); // Check written OK if (pFile->bad() || pFile->fail()) { JPEGErrorManager* pError = (JPEGErrorManager*)cinfo->err; pError->ThrowError(_R(IDE_FILE_WRITE_ERROR)); } pThis->m_DestMgr.next_output_byte = pThis->m_pBuffer; pThis->m_DestMgr.free_in_buffer = OUTPUT_BUF_SIZE; return TRUE; } /******************************************************************************************** > void JPEGDataDestination::TerminateDestination(j_compress_ptr cinfo) Author: Colin_Barfoot (Xara Group Ltd) Created: 29/10/96 Inputs: cinfo : a pointer to the IJG compression control structure Purpose: Terminate destination --- called by jpeg_finish_compress after all data has been written. Usually needs to flush buffer. Notes: *not* called by jpeg_abort or jpeg_destroy; surrounding application must deal with any cleanup that should happen even for error exit. ********************************************************************************************/ void JPEGDataDestination::TerminateDestination(libJPEG::j_compress_ptr cinfo) { JPEGDataDestination* pThis = GetThis(cinfo); CCFile* pFile = pThis->GetFile(); size_t DataCount = OUTPUT_BUF_SIZE - pThis->m_DestMgr.free_in_buffer; // Write any data remaining in the buffer if (DataCount > 0) { // Write out the full buffer pFile->write(pThis->m_pBuffer, DataCount); } pFile->flush(); // Make sure we wrote the output file OK if (pFile->bad() || pFile->fail()) { JPEGErrorManager* pError = (JPEGErrorManager*)cinfo->err; pError->ThrowError(_R(IDE_FILE_WRITE_ERROR)); } } /******************************************************************************************** > JPEGDataDestination* JPEGDataDestination::GetThis(j_compress_ptr cinfo) Author: Colin_Barfoot (Xara Group Ltd) Created: 29/10/96 Inputs: cinfo : a pointer to the IJG compression control structure Purpose: Helper function to return the this pointer buried in the cinfo structure ********************************************************************************************/ JPEGDataDestination* JPEGDataDestination::GetThis(libJPEG::j_compress_ptr cinfo) { JPEGDataDestination* pThis = ((IJGDestMgr*)(cinfo->dest))->pThis; ERROR3IF(!pThis->IS_KIND_OF(JPEGDataDestination), "GetThis - pThis isn't"); return pThis; } /******************************************************************************************** > CCFile* JPEGDataDestination::GetFile() const Author: Colin_Barfoot (Xara Group Ltd) Created: 29/10/96 Purpose: Helper function to return the CCFile associated with this JPEGDataDestination ********************************************************************************************/ CCFile* JPEGDataDestination::GetFile() const { return m_pOutputFile; }