File indexing completed on 2024-05-19 04:22:59

 /*
    Copyright (c) 2003-2007 Clarence Dang <dang@kde.org>
    Copyright (c) 2011 Martin Koller <kollix@aon.at>
    All rights reserved.
 
    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions
    are met:
 
    1. Redistributions of source code must retain the above copyright
       notice, this list of conditions and the following disclaimer.
    2. Redistributions in binary form must reproduce the above copyright
       notice, this list of conditions and the following disclaimer in the
       documentation and/or other materials provided with the distribution.
 
    THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
    IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
    OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
    IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
    INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
    NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
    DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
    THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
    (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
    THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 
 
 #define DEBUG_KP_SELECTION_DRAG 0
 
 
 #include "kpSelectionDrag.h"
 
 #include <QDataStream>
 #include <QImage>
 #include <QIODevice>
 #include <QUrl>
 
 #include "kpLogCategories.h"
 
 #include "kpSelectionFactory.h"
 #include "layers/selections/image/kpAbstractImageSelection.h"
 #include "layers/selections/image/kpRectangularImageSelection.h"
 
 //---------------------------------------------------------------------
 
 // public static
 const char * const kpSelectionDrag::SelectionMimeType =
     "application/x-kolourpaint-selection-400";
 
 //---------------------------------------------------------------------
 
 kpSelectionDrag::kpSelectionDrag (const kpAbstractImageSelection &sel)
 {
 #if DEBUG_KP_SELECTION_DRAG && 1
     qCDebug(kpLogLayers) << "kpSelectionDrag() w=" << sel.width ()
                << " h=" << sel.height ();
 #endif
 
     Q_ASSERT (sel.hasContent ());
 
     // Store as selection.
     QByteArray ba;
     {
         QDataStream stream (&ba, QIODevice::WriteOnly);
         stream << sel;
     }
     setData (QLatin1String(kpSelectionDrag::SelectionMimeType), ba);
 
     // Store as image (so that QMimeData::hasImage()) works).
     // OPT: an awful waste of memory storing image in both selection and QImage
     const QImage image = sel.baseImage ();
 #if DEBUG_KP_SELECTION_DRAG && 1
     qCDebug(kpLogLayers) << "\timage: w=" << image.width ()
                << " h=" << image.height ();
 #endif
     if (image.isNull ())
     {
         // TODO: proper error handling.
         qCCritical(kpLogLayers) << "kpSelectionDrag::setSelection() could not convert to image";
     }
     else {
         setImageData (image);
     }
 }
 
 //---------------------------------------------------------------------
 // public static
 
 bool kpSelectionDrag::canDecode(const QMimeData *mimeData)
 {
     Q_ASSERT(mimeData);
 
 #if DEBUG_KP_SELECTION_DRAG
     qCDebug(kpLogLayers) << "kpSelectionDrag::canDecode()"
              << "hasSel=" << mimeData->hasFormat(QLatin1String(kpSelectionDrag::SelectionMimeType))
              << "hasImage=" << mimeData->hasImage();
 #endif
 
     // mimeData->hasImage() would not check if the data is a valid image
     return mimeData->hasFormat(QLatin1String(kpSelectionDrag::SelectionMimeType)) ||
            !qvariant_cast<QImage>(mimeData->imageData()).isNull();
 }
 
 //---------------------------------------------------------------------
 // public static
 
 kpAbstractImageSelection *kpSelectionDrag::decode(const QMimeData *mimeData)
 {
 #if DEBUG_KP_SELECTION_DRAG
     qCDebug(kpLogLayers) << "kpSelectionDrag::decode(kpAbstractSelection)";
 #endif
     Q_ASSERT (mimeData);
 
     if (mimeData->hasFormat (QLatin1String(kpSelectionDrag::SelectionMimeType)))
     {
     #if DEBUG_KP_SELECTION_DRAG
         qCDebug(kpLogLayers) << "\tmimeSource hasFormat selection - just return it in QByteArray";
     #endif
         QByteArray data = mimeData->data (QLatin1String(kpSelectionDrag::SelectionMimeType));
         QDataStream stream (&data, QIODevice::ReadOnly);
 
         return kpSelectionFactory::FromStream (stream);
     }
 
 
 #if DEBUG_KP_SELECTION_DRAG
     qCDebug(kpLogLayers) << "\tmimeSource doesn't provide selection - try image";
 #endif
 
     QImage image = qvariant_cast <QImage> (mimeData->imageData ());
     if (!image.isNull ())
     {
 #if DEBUG_KP_SELECTION_DRAG
         qCDebug(kpLogLayers) << "\tok w=" << image.width () << " h=" << image.height ();
 #endif
 
         return new kpRectangularImageSelection (
                     QRect (0, 0, image.width (), image.height ()), image);
     }
 
     if ( mimeData->hasUrls() )  // no image, check for path to local image file
     {
         QList<QUrl> urls = mimeData->urls();
 
         if ( urls.count() && urls[0].isLocalFile() )
         {
             image.load(urls[0].toLocalFile());
 
             if ( !image.isNull() )
             {
                 return new kpRectangularImageSelection(
                             QRect(0, 0, image.width(), image.height()), image);
             }
         }
     }
 
       #if DEBUG_KP_SELECTION_DRAG
         qCDebug(kpLogLayers) << "kpSelectionDrag::decode(kpAbstractSelection) mimeSource had no sel "
                       "and could not decode to image";
       #endif
       return nullptr;
 
 }
 
 //---------------------------------------------------------------------
 
 #include "moc_kpSelectionDrag.cpp"