KisFileIconCreator Class Reference

The KisFileIconCreator class creates a thumbnail from a file on disk. More...

#include <KisFileIconCreator.h>

Inheritance diagram for KisFileIconCreator:

Public Member Functions
bool	createFileIcon (QString path, QIcon &icon, qreal devicePixelRatioF, QSize iconSize) override
	createFileIcon creates an icon from the file on disk
Public Member Functions inherited from KisAbstractFileIconCreator
	KisAbstractFileIconCreator ()
virtual	~KisAbstractFileIconCreator ()

Detailed Description

The KisFileIconCreator class creates a thumbnail from a file on disk.

On Welcome Page and possibly other places there might be a need to show the user a thumbnail of a file. This class tries to open a file and create a thumbnail out of it.

In theory creating the object is not needed, so if you, dear future reader, want to convert the function inside to a static one, go ahead.

Definition at line 25 of file KisFileIconCreator.h.

Member Function Documentation

createFileIcon()

bool KisFileIconCreator::createFileIcon ( QString path, QIcon & icon, qreal devicePixelRatioF, QSize iconSize )

overridevirtual

createFileIcon creates an icon from the file on disk

Parameters

path	path to the file
icon	created icon
devicePixelRatioF	a result from devicePixelRatioF() called in a widget
iconSize	size of the icon

Returns

true if icon was created successfully, false if not (for example the file doesn't exist)

Implements KisAbstractFileIconCreator.

Definition at line 86 of file KisFileIconCreator.cpp.

{
    iconSize *= devicePixelRatioF;
    QFileInfo fi(path);
    if (fi.exists()) {
        QString mimeType = KisMimeDatabase::mimeTypeForFile(path);
        if (mimeType == KisDocument::nativeFormatMimeType()
               || mimeType == "application/x-krita-archive"
               || mimeType == "image/openraster") {
 
            QScopedPointer<KoStore> store(KoStore::createStore(path, KoStore::Read));
            if (store) {
                QString thumbnailpath;
                if (store->hasFile(QString("Thumbnails/thumbnail.png"))){
                    thumbnailpath = QString("Thumbnails/thumbnail.png");
                }
                else if (store->hasFile(QString("mergedimage.png"))) {
                    thumbnailpath = QString("mergedimage.png");
                }
                else if (store->hasFile(QString("preview.png"))) {
                    thumbnailpath = QString("preview.png");
                }
                if (!thumbnailpath.isEmpty() && store->open(thumbnailpath)) {
 
                    QByteArray bytes = store->read(store->size());
                    store->close();
                    QImage img;
                    img.loadFromData(bytes);
 
                    icon = createIcon(img, iconSize);
                    return true;
 
                } else {
                    return false;
                }
            } else {
                return false;
            }
        } else if (mimeType == "image/tiff" || mimeType == "image/x-tiff" || mimeType == "image/jxl") {
            // Workaround for a bug in Qt tiff QImageIO plugin
            // XXX: Also for JPEG-XL if KImageFormats haven't updated to accommodate libjxl >= v0.9.0 API changes.
            QScopedPointer<KisDocument> doc(KisPart::instance()->createTemporaryDocument());
            doc->setFileBatchMode(true);
            bool r = doc->openPath(path, KisDocument::DontAddToRecent);
            if (r) {
                KisPaintDeviceSP projection = doc->image()->projection();
                const QRect bounds = projection->exactBounds();
                QSize imageSize = bounds.size();
                if (imageSize.width() > iconSize.width() || imageSize.height() > iconSize.height()) {
                    imageSize.scale(iconSize, Qt::KeepAspectRatio);
                }
                const QImage &thumbnail = projection->createThumbnail(imageSize.width(), imageSize.height(), bounds);
                icon = createIcon(thumbnail, iconSize);
                return true;
            } else {
                return false;
            }
        } else {
            QImage img;
            img.load(path);
            if (!img.isNull()) {
                icon = createIcon(img, iconSize);
                return true;
            } else {
                return false;
            }
        }
    } else {
        return false;
    }
}

References bounds, KoStore::createStore(), KisPaintDevice::createThumbnail(), KisDocument::DontAddToRecent, KisPaintDevice::exactBounds(), iconSize(), KisPart::instance(), KisMimeDatabase::mimeTypeForFile(), KisDocument::nativeFormatMimeType(), and KoStore::Read.

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The documentation for this class was generated from the following files:

• libs/ui/utils/KisFileIconCreator.h
• libs/ui/utils/KisFileIconCreator.cpp