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Diffstat (limited to 'kfaxview/faxrenderer.cpp')
| -rw-r--r-- | kfaxview/faxrenderer.cpp | 204 |
1 files changed, 204 insertions, 0 deletions
diff --git a/kfaxview/faxrenderer.cpp b/kfaxview/faxrenderer.cpp new file mode 100644 index 00000000..ec18d431 --- /dev/null +++ b/kfaxview/faxrenderer.cpp @@ -0,0 +1,204 @@ +/*************************************************************************** + * Copyright (C) 2005 by Stefan Kebekus * + * kebekus@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, Boston, MA 02110-1301, USA. * + ***************************************************************************/ + +#include <config.h> + +#include <kmessagebox.h> +#include <kdebug.h> +#include <klocale.h> +#include <qfileinfo.h> +#include <qpainter.h> + +#include "documentWidget.h" +#include "faxrenderer.h" +#include "faxmultipage.h" + +//#define KF_DEBUG + +FaxRenderer::FaxRenderer(QWidget* par) + : DocumentRenderer(par) +{ +#ifdef KF_DEBUG + kdError() << "FaxRenderer( parent=" << par << " )" << endl; +#endif +} + + + +FaxRenderer::~FaxRenderer() +{ +#ifdef KF_DEBUG + kdDebug() << "~FaxRenderer" << endl; +#endif + + // Wait for all access to this documentRenderer to finish + mutex.lock(); + mutex.unlock(); +} + + +void FaxRenderer::drawPage(double resolution, RenderedDocumentPage* page) +{ +#ifdef KF_DEBUG + kdDebug() << "FaxRenderer::drawPage(documentPage*) called, page number " << page->getPageNumber() << endl; +#endif + + // Paranoid safety checks + if (page == 0) { + kdError() << "FaxRenderer::drawPage(documentPage*) called with argument == 0" << endl; + return; + } + if (page->getPageNumber() == 0) { + kdError() << "FaxRenderer::drawPage(documentPage*) called for a documentPage with page number 0" << endl; + return; + } + + // Wait for all access to this documentRenderer to finish + mutex.lock(); + + // more paranoid safety checks + if (page->getPageNumber() > numPages) { + kdError() << "FaxRenderer::drawPage(documentPage*) called for a documentPage with page number " << page->getPageNumber() + << " but the current fax file has only " << numPages << " pages." << endl; + mutex.unlock(); + return; + } + + QImage img = fax.page(page->getPageNumber() - 1); + + SimplePageSize psize = pageSizes[page->getPageNumber() - 1]; + if (psize.isValid()) { + QPainter *foreGroundPaint = page->getPainter(); + if (foreGroundPaint != 0) { + // Compute an image for the page. + + // WARNING: It may be tempting to compute the image size in + // pixel, using page->height() and page->width(). DON'T DO + // THAT. KViewShell uses transformations e.g. to rotate the + // page, and sets the argument 'resolution' accordingly. Similar + // problems occur if KViewShell required a shrunken version of + // the page, e.g. to print multiple pages on one sheet of paper. + + int width_in_pixel = qRound(resolution * psize.width().getLength_in_inch()); + int height_in_pixel = qRound(resolution * psize.height().getLength_in_inch()); + + img = img.smoothScale(width_in_pixel, height_in_pixel); + foreGroundPaint->drawImage(0, 0, img); + page->returnPainter(foreGroundPaint); + } + } else + kdError() << "FaxRenderer::drawPage() called, but page size for page " << page->getPageNumber() << " is invalid." << endl; + + // To indicate that the page was drawn, we set the appropriate flas in the page structure + page->isEmpty = false; + + mutex.unlock(); +} + + +bool FaxRenderer::setFile(const QString &fname, const KURL &) +{ +#ifdef KF_DEBUG + kdDebug() << "FaxRenderer::setFile(" << fname << ") called" << endl; +#endif + + // Wait for all access to this documentRenderer to finish + mutex.lock(); + + // If fname is the empty string, then this means: "close". + if (fname.isEmpty()) { + kdDebug() << "FaxRenderer::setFile( ... ) called with empty filename. Closing the file." << endl; + mutex.unlock(); + return true; + } + + // Paranoid saftey checks: make sure the file actually exists, and + // that it is a file, not a directory. Otherwise, show an error + // message and exit.. + QFileInfo fi(fname); + QString filename = fi.absFilePath(); + if (!fi.exists() || fi.isDir()) { + KMessageBox::error( parentWidget, + i18n("<qt><strong>File error.</strong> The specified file '%1' does not exist.</qt>").arg(filename), + i18n("File Error")); + // the return value 'false' indicates that this operation was not successful. + mutex.unlock(); + return false; + } + + // Now we assume that the file is fine and load the file into the + // fax member. We abort on error and give an error message. + bool ok = fax.loadImage(filename); + + // It can happen that fax.loadImage() returns with 'ok == true', but + // still the file could NOT be loaded. This happens, e.g. for TIFF + // file that do NOT contain FAX, but other image formats. We handle + // that case here also. + if ( (!ok) || (fax.numPages() == 0)) { + // Unfortunately, it can happen that fax.loadImage() fails WITHOUT + // leaving an error message in fax.errorString(). We try to handle + // this case gracefully. + if (fax.errorString().isEmpty()) + KMessageBox::error( parentWidget, + i18n("<qt><strong>File error.</strong> The specified file '%1' could not be loaded.</qt>").arg(filename), + i18n("File Error")); + else + KMessageBox::detailedError( parentWidget, + i18n("<qt><strong>File error.</strong> The specified file '%1' could not be loaded.</qt>").arg(filename), + fax.errorString(), + i18n("File Error")); + clear(); + mutex.unlock(); + return false; + } + + // Set the number of pages page sizes + numPages = fax.numPages(); + + // Set the page size for the first page in the pageSizes array. + // The rest of the page sizes will be calculated on demand by the drawPage function. + pageSizes.resize(numPages); + Length w,h; + + if (numPages != 0) { + for(Q_UINT16 pg=0; pg < numPages; pg++) { + QSize pageSize = fax.page_size(pg); + QPoint dpi = fax.page_dpi(pg); + double dpix = dpi.x(); + double dpiy = dpi.y(); + + if (dpix*dpiy < 1.0) { + kdError() << "File invalid resolutions, dpi x = " << dpix << ", dpi y = " << dpiy << ". This information will be ignored and 75 DPI assumed." << endl; + dpix = dpiy = 75.0; + } + + w.setLength_in_inch(pageSize.width() / dpix); + h.setLength_in_inch(pageSize.height() / dpiy); + pageSizes[pg].setPageSize(w, h); + } + } + + // the return value 'true' indicates that this operation was not successful. + mutex.unlock(); + return true; +} + + +#include "faxrenderer.moc" |