Loading...

XML

Word

Printable

Details

Type: Bug
Resolution: Done
Priority: P2: Important
Fix Version/s: 5.9.2
Affects Version/s: 5.9.1
Component/s: Image formats
Labels:
None

Commits:
85ed63f825da57103c68f73af5adeebf67db0da9

Description

WebP animations stop running after the first loop, because QWebpHandler::canRead() returns true even if there are no more frames to read. Thus, QMovie attempts to read the next frame when it should jump back to the first frame, ends up reading a null-image, and the animation is interrupted.

Qt Widgets:

#include <QtWidgets>

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);

    QLabel label;
    label.resize(300, 300);
    label.setAlignment(Qt::AlignCenter);
    label.setMovie(new QMovie("path/to/busyindicator.webp"));
    label.movie()->start();
    label.show();

    return app.exec();
}

Qt Quick:

import QtQuick 2.9
import QtQuick.Window 2.2

Window {
    width: 300
    height: 300
    visible: true

    AnimatedImage {
        anchors.centerIn: parent
        source: "file:///path/to/busyindicator.webp"
    }
}