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129 lines
4.3 KiB
C++
129 lines
4.3 KiB
C++
/* This file is part of the KDE project
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Copyright (C) 2022 Ivailo Monev <xakepa10@gmail.com>
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License version 2, as published by the Free Software Foundation.
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This library 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 GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public License
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along with this library; see the file COPYING.LIB. If not, write to
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the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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Boston, MA 02110-1301, USA.
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*/
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#include "djvucreator.h"
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#include <QImage>
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#include <QCoreApplication>
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#include <QThread>
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#include <kdebug.h>
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#include <kdemacros.h>
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#include <libdjvu/ddjvuapi.h>
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static const int s_eventstime = 250;
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static const int s_sleeptime = 100;
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extern "C"
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{
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KDE_EXPORT ThumbCreator *new_creator()
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{
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return new DjVuCreator();
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}
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}
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DjVuCreator::DjVuCreator()
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{
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}
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bool DjVuCreator::create(const QString &path, int width, int height, QImage &img)
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{
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const QByteArray pathbytes = path.toUtf8();
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ddjvu_context_t* djvuctx = ddjvu_context_create("djvucreator");
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if (!djvuctx) {
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kWarning() << "Could not create DjVu context";
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return false;
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}
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ddjvu_document_t* djvudoc = ddjvu_document_create_by_filename_utf8(djvuctx, pathbytes.constData(), FALSE);
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if (!djvudoc) {
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kWarning() << "Could not create DjVu document";
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ddjvu_context_release(djvuctx);
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return false;
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}
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kDebug() << "Waiting for document decoding to complete";
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while (!ddjvu_document_decoding_done(djvudoc)) {
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QCoreApplication::processEvents(QEventLoop::AllEvents, s_eventstime);
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QThread::msleep(s_sleeptime);
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}
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kDebug() << "Done waiting for document decoding to complete";
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ddjvu_page_t* djvupage = ddjvu_page_create_by_pageno(djvudoc, 0);
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if (!djvupage) {
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kWarning() << "Could not create DjVu page";
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ddjvu_document_release(djvudoc);
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ddjvu_context_release(djvuctx);
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return false;
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}
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kDebug() << "Waiting for page decoding to complete";
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while (!ddjvu_page_decoding_done(djvupage)) {
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QCoreApplication::processEvents(QEventLoop::AllEvents, s_eventstime);
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QThread::msleep(s_sleeptime);
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}
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kDebug() << "Done waiting for page decoding to complete";
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uint djvumask[4] = { 0x00ff0000, 0x0000ff00, 0x000000ff, 0xff000000 };
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int djvumasksize = 3; // sizeof(djvumask);
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ddjvu_format_t* djvuformat = ddjvu_format_create(DDJVU_FORMAT_RGBMASK32, djvumasksize, djvumask);
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if (!djvuformat) {
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kWarning() << "Could not create DjVu format";
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ddjvu_page_release(djvupage);
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ddjvu_document_release(djvudoc);
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ddjvu_context_release(djvuctx);
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return false;
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}
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ddjvu_format_set_row_order(djvuformat, 1);
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ddjvu_format_set_y_direction(djvuformat, 1);
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QSize pagesize(ddjvu_page_get_width(djvupage), ddjvu_page_get_height(djvupage));
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pagesize.scale(width, height, Qt::KeepAspectRatio);
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ddjvu_rect_t djvupagerect;
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djvupagerect.x = 0;
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djvupagerect.y = 0;
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djvupagerect.w = pagesize.width();
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djvupagerect.h = pagesize.height();
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ddjvu_rect_t djvurenderrect;
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djvurenderrect = djvupagerect;
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img = QImage(djvurenderrect.w, djvurenderrect.h, QImage::Format_RGB32);
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const int djvustatus = ddjvu_page_render(
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djvupage,
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DDJVU_RENDER_COLOR,
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&djvupagerect, &djvurenderrect,
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djvuformat,
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img.bytesPerLine(), reinterpret_cast<char*>(img.bits())
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);
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if (djvustatus == FALSE) {
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kWarning() << "Could not render DjVu page";
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ddjvu_format_release(djvuformat);
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ddjvu_page_release(djvupage);
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ddjvu_document_release(djvudoc);
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ddjvu_context_release(djvuctx);
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img = QImage();
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return false;
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}
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ddjvu_format_release(djvuformat);
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ddjvu_page_release(djvupage);
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ddjvu_document_release(djvudoc);
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ddjvu_context_release(djvuctx);
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return true;
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}
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ThumbCreator::Flags DjVuCreator::flags() const
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{
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return ThumbCreator::Flags(ThumbCreator::DrawFrame);
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}
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