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115 lines
3.3 KiB
C++
115 lines
3.3 KiB
C++
// vim: set tabstop=4 shiftwidth=4 expandtab:
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/*
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Gwenview: an image viewer
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Copyright 2008 Aurélien Gâteau <agateau@kde.org>
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Cambridge, MA 02110-1301, USA.
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*/
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// Self
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#include "iodevicejpegsourcemanager.h"
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// Qt
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#include <QIODevice>
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// KDE
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#include <KDebug>
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// libjpeg
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#include <stdio.h>
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#define XMD_H
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extern "C" {
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#include <jpeglib.h>
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}
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// Local
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namespace Gwenview
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{
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namespace IODeviceJpegSourceManager
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{
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#define SOURCE_MANAGER_BUFFER_SIZE 4096
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struct IODeviceJpegSourceManager : public jpeg_source_mgr
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{
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QIODevice* mIODevice;
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JOCTET mBuffer[SOURCE_MANAGER_BUFFER_SIZE];
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};
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static boolean fill_input_buffer(j_decompress_ptr cinfo)
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{
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IODeviceJpegSourceManager* src = static_cast<IODeviceJpegSourceManager*>(cinfo->src);
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Q_ASSERT(src->mIODevice);
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int readSize = src->mIODevice->read((char*)src->mBuffer, SOURCE_MANAGER_BUFFER_SIZE);
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if (readSize > 0) {
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src->next_input_byte = src->mBuffer;
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src->bytes_in_buffer = readSize;
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} else {
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/**
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* JPEG file is broken. We feed the decoder with fake EOI, as specified
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* in the libjpeg documentation.
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*/
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static JOCTET fakeEOI[2] = { JOCTET(0xFF), JOCTET(JPEG_EOI)};
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kWarning() << "Image is incomplete";
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cinfo->src->next_input_byte = fakeEOI;
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cinfo->src->bytes_in_buffer = 2;
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}
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return true;
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}
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static void init_source(j_decompress_ptr cinfo)
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{
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fill_input_buffer(cinfo);
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}
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static void skip_input_data(j_decompress_ptr cinfo, long num_bytes)
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{
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if (num_bytes > 0) {
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while (num_bytes > (long) cinfo->src->bytes_in_buffer) {
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num_bytes -= (long) cinfo->src->bytes_in_buffer;
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fill_input_buffer(cinfo);
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/**
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* we assume that fill_input_buffer will never return FALSE, so
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* suspension need not be handled.
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*/
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}
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cinfo->src->next_input_byte += (size_t) num_bytes;
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cinfo->src->bytes_in_buffer -= (size_t) num_bytes;
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}
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}
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static void term_source(j_decompress_ptr)
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{
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}
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void setup(j_decompress_ptr cinfo, QIODevice* ioDevice)
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{
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Q_ASSERT(!cinfo->src);
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IODeviceJpegSourceManager* src = (IODeviceJpegSourceManager*)
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(*cinfo->mem->alloc_small)((j_common_ptr) cinfo, JPOOL_PERMANENT,
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sizeof(IODeviceJpegSourceManager));
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cinfo->src = src;
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src->init_source = init_source;
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src->fill_input_buffer = fill_input_buffer;
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src->skip_input_data = skip_input_data;
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src->resync_to_restart = jpeg_resync_to_restart;
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src->term_source = term_source;
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src->mIODevice = ioDevice;
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}
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} // IODeviceJpegSourceManager namespace
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} // Gwenview namespace
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