File indexing completed on 2024-05-12 04:19:35

 // vim: set tabstop=4 shiftwidth=4 expandtab:
 /*
 Gwenview: an image viewer
 Copyright 2012 Aurélien Gâteau <agateau@kde.org>
 
 This program is free software; you can redistribute it and/or
 modify it under the terms of the GNU General Public License
 as published by the Free Software Foundation; either version 2
 of the License, or (at your option) any later version.
 
 This program is 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.
 
 You should have received a copy of the GNU General Public License
 along with this program; if not, write to the Free Software
 Foundation, Inc., 51 Franklin Street, Fifth Floor, Cambridge, MA 02110-1301, USA.
 
 */
 // Self
 #include "cmsprofile_png.h"
 
 // Local
 #include <gvdebug.h>
 #include "gwenview_lib_debug.h"
 
 // KF
 
 // Qt
 #include <QBuffer>
 
 // lcms
 #include <lcms2.h>
 
 // libpng
 #include <png.h>
 
 namespace Gwenview
 {
 
 namespace Cms
 {
 
 static void readPngChunk(png_structp png_ptr, png_bytep data, png_size_t length)
 {
     auto in = (QIODevice *)png_get_io_ptr(png_ptr);
 
     while (length) {
         int nr = in->read((char*)data, length);
         if (nr <= 0) {
             png_error(png_ptr, "Read Error");
             return;
         }
         length -= nr;
     }
 }
 
 cmsHPROFILE loadFromPngData(const QByteArray& data)
 {
     QBuffer buffer;
     buffer.setBuffer(const_cast<QByteArray*>(&data));
     buffer.open(QIODevice::ReadOnly);
 
     // Initialize the internal structures
     png_structp png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, nullptr, nullptr, nullptr);
     GV_RETURN_VALUE_IF_FAIL(png_ptr, nullptr);
 
     png_infop info_ptr = png_create_info_struct(png_ptr);
     if (!info_ptr) {
         png_destroy_read_struct(&png_ptr, (png_infopp)nullptr, (png_infopp)nullptr);
         qCWarning(GWENVIEW_LIB_LOG) << "Could not create info_struct";
         return nullptr;
     }
 
     png_infop end_info = png_create_info_struct(png_ptr);
     if (!end_info) {
         png_destroy_read_struct(&png_ptr, &info_ptr, (png_infopp)nullptr);
         qCWarning(GWENVIEW_LIB_LOG) << "Could not create info_struct2";
         return nullptr;
     }
 
     // Catch errors
     if (setjmp(png_jmpbuf(png_ptr))) {
         png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
         qCWarning(GWENVIEW_LIB_LOG) << "Error decoding png file";
         return nullptr;
     }
 
     // Initialize the special
     png_set_read_fn(png_ptr, &buffer, readPngChunk);
 
     // read all PNG info up to image data
     png_read_info(png_ptr, info_ptr);
 
     // Get profile
     png_charp profile_name;
 #if PNG_LIBPNG_VER_MAJOR >= 1 && PNG_LIBPNG_VER_MINOR >= 5
     png_bytep profile_data;
 #else
     png_charp profile_data;
 #endif
     int compression_type;
     png_uint_32 proflen;
 
     cmsHPROFILE profile = nullptr;
     if (png_get_iCCP(png_ptr, info_ptr, &profile_name, &compression_type, &profile_data, &proflen)) {
         profile = cmsOpenProfileFromMem(profile_data, proflen);
     }
     png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
     return profile;
 }
 
 } // namespace Cms
 } // namespace Gwenview