Claw
1.7.0
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00001 /* 00002 CLAW - a C++ Library Absolutely Wonderful 00003 00004 CLAW is a free library without any particular aim but being useful to 00005 anyone. 00006 00007 Copyright (C) 2005-2011 Julien Jorge 00008 00009 This library is free software; you can redistribute it and/or 00010 modify it under the terms of the GNU Lesser General Public 00011 License as published by the Free Software Foundation; either 00012 version 2.1 of the License, or (at your option) any later version. 00013 00014 This library is distributed in the hope that it will be useful, 00015 but WITHOUT ANY WARRANTY; without even the implied warranty of 00016 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00017 Lesser General Public License for more details. 00018 00019 You should have received a copy of the GNU Lesser General Public 00020 License along with this library; if not, write to the Free Software 00021 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 00022 00023 contact: julien.jorge@gamned.org 00024 */ 00031 #include <claw/jpeg_error_manager.hpp> 00032 #include <claw/exception.hpp> 00033 00034 /*----------------------------------------------------------------------------*/ 00040 template<class Convert> 00041 void claw::graphic::jpeg::reader::read_data 00042 ( jpeg_decompress_struct& cinfo, const Convert& pixel_convert ) 00043 { 00044 const unsigned int pixel_size = cinfo.output_components; 00045 JSAMPLE* buffer = new JSAMPLE[cinfo.output_width * pixel_size]; 00046 00047 error_manager jerr; 00048 jpeg_error_mgr* jerr_saved = cinfo.err; 00049 00050 cinfo.err = jpeg_std_error(&jerr.pub); 00051 jerr.pub.error_exit = jpeg__error_manager__error_exit; 00052 00053 if ( setjmp(jerr.setjmp_buffer) ) 00054 { 00055 delete[] buffer; 00056 throw CLAW_EXCEPTION(jerr.error_string); 00057 } 00058 00059 while (cinfo.output_scanline < cinfo.output_height) 00060 { 00061 jpeg_read_scanlines(&cinfo, &buffer, 1); 00062 00063 scanline::iterator pixel = m_image[cinfo.output_scanline-1].begin(); 00064 00065 for ( unsigned int i=0; i!=pixel_size*m_image.width(); 00066 i+=pixel_size, ++pixel ) 00067 *pixel = pixel_convert( &buffer[i] ); 00068 } 00069 00070 delete[] buffer; 00071 cinfo.err = jerr_saved; 00072 } // jpeg::reader::read_data()