Yeah, it looks like this will work quite well :)
Using either ShaderEffectSource or turning the item into a texture provider
using Item::layer::enabled is the way to do this prior to Qt 5.4.
cheers,
Gunnar
www.sletta.org
On 13 Sep 2014, at 16:28, manish sharma <83.man...@gmail.com> wrote:
> Hi,
>
> I found a way to get the QImage of an QQuickItem, I am aware of
> QQuickWindow::grabImage and QQuickItem::grabToImage will be available in
> Qt5.4. So far i am getting correct QImage and it seems to work quite well. I
> want to know what i am doing is correct.
>
> Flow:-
> - create ShaderEffectSource
> - on ShaderEffectSource::scheduledUpdateCompleted signal hook to
> afterRendering of window
> - inside afterRendering get the ShaderEffectSource::textureProvider::texture
> and use glGetTexImage to get an QImage.
>
> Code:-
> C++
> QuickWindow()
> {
> .....
> m_snapshotItem = root->findChild<QQuickItem*>("snapShotItem");
> connect (m_snapshotItem, SIGNAL(scheduledUpdateCompleted()), this,
> SLOT(takeSnapshot()));
> }
>
> private slots:
> void takeSnapshot()
> {
> connect(this, SIGNAL(afterRendering()), this, SLOT(getImage()),
> Qt::DirectConnection);
> }
>
> void getImage()
> {
> qDebug() << "taking snapshot..!";
> disconnect(this, SIGNAL(afterRendering()), this, SLOT(getImage()));
> QSGTexture *texture = m_snapshotItem->textureProvider()->texture();
> texture->bind();
> GLint internalFormat;
> glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_COMPONENTS,
> &internalFormat); // get internal format type of GL texture
> QImage img(texture->textureSize(), QImage::Format_RGBX8888);
> glGetTexImage(GL_TEXTURE_2D, 0, internalFormat, GL_UNSIGNED_BYTE,
> img.bits());
> img.save("c:\\temp\\snapshot.bmp");
> }
>
> QML
> Item {
> anchors.fill: parent
>
> Rectangle {
> id: rect
> anchors.fill: parent
> color: "green"
> }
>
> ShaderEffectSource {
> objectName: 'snapShotItem'
> anchors.fill: rect
> live: false
> recursive: false
> sourceItem: rect
> }
> }
>
> Regards,
> Manish
>
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