// $Id: pngfuncs.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============================ */ // Replacements for some libpng functions (pointers to these functions // are passed to libpng) #include "camtypes.h" #include "png.h" #include "pngprgrs.h" #include "pngutil.h" //#include "fixmem.h" - in camtypes.h [AUTOMATICALLY REMOVED] /******************************************************************* > void camelot_png_error(png_structp png_ptr, png_const_charp message) Author: Jonathan_Payne (Xara Group Ltd) Created: 29/8/2000 Inputs: png_ptr, error message Outputs: Error message Returns: void Purpose: Pointer to this function given to libpng to be called in case of error. *******************************************************************/ void camelot_png_error(png_structp png_ptr, png_const_charp message) { TRACEUSER( "Gavin", _T("PNG: libpng error: %s\n"), message); // Use the error handler in the PNG util function which assumes TRY CATCH block in // operation and CCFile present, in which case it will use the CCFile GotError function // PNGUtil::DefaultErrorHandler(MessageID, message); PNGUtil::DefaultErrorHandler(); } /******************************************************************* > void camelot_png_warning(png_structp png_ptr, png_const_charp message) Author: Jonathan_Payne (Xara Group Ltd) Created: 29/8/2000 Inputs: png_ptr, warning message Outputs: Nothing (except a trace message) Returns: void Purpose: Pointer to this function given to libpng to be called in case of warning. *******************************************************************/ void camelot_png_warning(png_structp png_ptr, png_const_charp message) { if (!png_ptr) return; TRACEUSER( "Gavin", _T("PNG: libpng warning: %s\n"), message); } /******************************************************************* > void camelot_png_read_data(png_structp png_ptr, png_bytep data, png_size_t length) Author: Jonathan_Payne (Xara Group Ltd) Created: 29/8/2000 Inputs: png_ptr, amount to be read Outputs: 'data' set to data from file Returns: void Purpose: Pointer to this function given to libpng to be called for reading data. *******************************************************************/ void camelot_png_read_data(png_structp png_ptr, png_bytep data, png_size_t length) { iostream *fp = (iostream *)png_get_io_ptr(png_ptr); png_uint_32 check = png_uint_32(length); if (fp) fp->read((char *) data, check ); else png_error(png_ptr, "Read Error"); if (check != length) { png_error(png_ptr, "Read Error"); } } /******************************************************************* > void camelot_png_write_data(png_structp png_ptr, png_bytep data, png_size_t length) Author: Jonathan_Payne (Xara Group Ltd) Created: 29/8/2000 Inputs: png_ptr, amount to be written, data Outputs: Data in file Returns: void Purpose: Pointer to this function given to libpng to be called for writting data. *******************************************************************/ void camelot_png_write_data(png_structp png_ptr, png_bytep data, png_size_t length) { iostream *fp = (iostream *)png_get_io_ptr(png_ptr); png_uint_32 check = png_uint_32(length); if (fp) fp->write((const char*)data, check); else png_error(png_ptr, "Write Error"); if (check != length) { png_error(png_ptr, "Write Error"); } } /******************************************************************* > void camelot_png_flush_data(png_structp png_ptr) Author: Jonathan_Payne (Xara Group Ltd) Created: 29/8/2000 Inputs: png_ptr Outputs: Output stream flushed Returns: void Purpose: Pointer to this function given to libpng to be called for flushing output stream on write. *******************************************************************/ void camelot_png_flush_data(png_structp png_ptr) { iostream *fp = (iostream *)png_get_io_ptr(png_ptr); if (fp) fp->flush(); } /******************************************************************* > void camelot_png_malloc(png_structp png_ptr, png_size_t size) Author: Jonathan_Payne (Xara Group Ltd) Created: 29/8/2000 Inputs: png_ptr, size of memory Outputs: Memory block Returns: void * to memory Purpose: Pointer to this function given to libpng to be called for allocing memory. *******************************************************************/ void *camelot_png_malloc(png_structp png_ptr, png_size_t size) { return (CCMalloc(size)); } /******************************************************************* > void camelot_png_free(png_structp png_ptr, png_voidp data) Author: Jonathan_Payne (Xara Group Ltd) Created: 29/8/2000 Inputs: png_ptr, &data Returns: void Purpose: Pointer to this function given to libpng to be called for freeing data. *******************************************************************/ void camelot_png_free(png_structp png_ptr, png_voidp data) { CCFree(data); } /******************************************************************* > void camelot_png_write_row_callback (png_structp png_ptr, png_uint_32 row_number, INT32 pass) Author: Jonathan_Payne (Xara Group Ltd) Created: 29/8/2000 Inputs: png_ptr, row, pass Outputs: Status bar update Returns: void Purpose: Pointer to this function given to libpng to be called when a row has been read. IMPORTANT NOTE: This function is not used, I have just included it for completness (the write code does its own status bar updates). *******************************************************************/ void camelot_png_write_row_callback (png_structp png_ptr, png_uint_32 row_number, INT32 pass) { }