And make qquickviewcomparison able to demonstrate how to create a
partially transparent QQuickWidget.

Avoid also recreating the QQuickView/QQuickWidget multiple times
when switching between the radio buttons.

[ChangeLog] Added QQuickWidget::setClearColor() in order to support
semi-transparent QQuickWidgets.

Change-Id: I319ad4afbe909530274d09f2a7fcff23730d6ebd
Reviewed-by: Jørgen Lind <jorgen.lind@digia.com>

The enablers are already in. Now we just need to use the virtual in
QQuickWidgetPrivate and test it.

Task-number: QTBUG-39562
Change-Id: I1faf5a0a244ba4169fb8f9b0dae657304038b60e
Reviewed-by: Gunnar Sletta <gunnar.sletta@jollamobile.com>

Taking the persistent flags from the QQuickWindow was a bad idea. These
are not applicable to the case when an application drives the scene via
QQuickRenderControl. Once stop() is called, all resources must be
released since the context itself will typically be destroyed afterwards.

This is a backport of 0b0bb319

 in dev.

On top of this, stop() becomes invalidate() since the original
invalidate() function is never used by anyone. This naming is much cleaner
and is consistent with QSGContext and friends.

Task-number: QTBUG-40505
Task-number: QTBUG-40435
Change-Id: I398f1bda31f335c3508b238f0328305d3cd79ffd
Reviewed-by: Gunnar Sletta <gunnar.sletta@jollamobile.com>

To be consistent.

Change-Id: Ia78bf4a27e8ccb1a4f0a44865e810f1070c39e5d
Reviewed-by: Gunnar Sletta <gunnar.sletta@jollamobile.com>

This corrects two issues:

1. Recreating the fbo twice when the widget is shown. Calling
createFramebufferObject() is not necessary in this case since createContext()
will trigger this anyhow due to scenegraphInitialized().

2. Avoid recreating the fbo when the size is the same as before. Some platforms
are keen on sending resize events with the same size. These should be ignored.
What's worse, some platforms (cocoa) generate a resize on exitting (Cmd-Q)
and not ignoring the resize at that stage is dangerous since the scenegraph
is already invalidated.

Task-number: QTBUG-40505
Change-Id: I21ff418fde449aa15eef4d6593e7a518861fcde1
Reviewed-by: Gunnar Sletta <gunnar.sletta@jollamobile.com>

Change-Id: I438c33a1dc83fd0cd1ec08bb4e4a1257a3216ca2
Reviewed-by: Laszlo Agocs <laszlo.agocs@digia.com>

Resizing to an empty size followed by another resize leads to
sync() without having the context and the render control intialized.
This is wrong.

Task-number: QTBUG-39858
Change-Id: I5908723272165a656d192644cceb16ed253e6d3b
Reviewed-by: Jørgen Lind <jorgen.lind@digia.com>

This introduces the need for a grab function in QQuickWidget.
The render control has one already so there is no reason for not exposing
this in QQuickWidget too.

This also means that a relatively meaningful autotest can be now be added.

[ChangeLog][QtQuick] Added QQuickWidget::grabFramebuffer() for capturing the content into a QImage.

Task-number: QTBUG-37589
Change-Id: I5ca8192c0ef8dab4f076a4db27b64aebe3359bb8
Reviewed-by: Gunnar Sletta <gunnar.sletta@jollamobile.com>

QQuickRenderControl allows rendering Qt Quick 2 scenes into framebuffer
objects which can then be used in arbitrary ways in Qt-based or 3rd party
OpenGL renderers.

[ChangeLog][QtQuick] Introduced QQuickRenderControl as a public API.

Task-number: QTBUG-37944
Change-Id: I84262243b261b35cefdf67ec6bba8127a0f29275
Reviewed-by: Paul Olav Tvete <paul.tvete@digia.com>

Make text input functional out of the box.

Both QGraphicsView and QDeclarativeView (QQuick1) do this so there
is no reason to do this differently for QQuickWidget. For QQuickWindow
and QQuickView the issue does not exist in the first place, they will
accept the focus by default.

Task-number: QTBUG-39605
Change-Id: I74f01b85342df51aa3c0e80baf58ba1619c63438
Reviewed-by: Gunnar Sletta <gunnar.sletta@jollamobile.com>

This is a quick-fix. The real issue is that QWidget and QWindow
reacts differently when a QDragEnterEvent is rejected.

Change-Id: I3e3e50610c14acfaada9c1b243b88cfe9eae54b2
Reviewed-by: Laszlo Agocs <laszlo.agocs@digia.com>

Use a multisampled fbo when the requested format has samples > 0.
Resolving happens after each rendering of the scene.

The blit to the temporary non-multisampled fbo could be avoided,
in theory, by sending the fbo instead of the texture id down the
stack and performing a blit directly to fbo #0. This however
involves a number of potential issues, for example due to the
non-sharability of FBOs between contexts. Hence it is left as a
future exercise.

Task-number: QTBUG-39187
Change-Id: Iae98b969bcbc3bb57e6d73288496f5428913c826
Reviewed-by: Paul Olav Tvete <paul.tvete@digia.com>
Reviewed-by: Gunnar Sletta <gunnar.sletta@jollamobile.com>

Create the QOffscreenSurface together with, and after, the QOpenGLContext.
This is essential to get a surface that is compatible with the context and
is in line with the QOffscreenSurface usage recommendation from the docs.

Otherwise, if the offscreen surface gets created first, without
knowing what _actual_ format (e.g. EGL configuration) the context
will use, the result is an incompatible surface and context on
systems that offer a different set of configurations for window and
pbuffer surfaces.

This fixes QQuickWidget on EGL implementations that offer both 16 and 24
bit pbuffer configs, but only 24 (or 32) bit window configs.

Task-number: QTBUG-39474
Change-Id: I43925d2b25e28d26d172ce9d22651c25b281b832
Reviewed-by: Paul Olav Tvete <paul.tvete@digia.com>

This is not supported.

Change-Id: I19ed485ee629baa4f3631770ab0c730e0ef6748e
Reviewed-by: Paul Olav Tvete <paul.tvete@digia.com>

QQuickRenderControl needs a QQuickWindow in order to function. This
required the use of a private QQuickWindow constructor, meaning that
only friend classes of QQuickWindow could use QQuickRenderControl.

This change adds a factory function, QQuickRenderControl::createOffscreenWindow().

Task-number: QTBUG-38996
Change-Id: I92f6f1f60045934f3dd33c300352247852463c73
Reviewed-by: Gunnar Sletta <gunnar.sletta@jollamobile.com>

When creating the new FBO, it will try to restore the previous FBO
after initialization. The internal tracking of the current FBO goes
horribly wrong when a QOpenGLFramebufferObject is destroyed with
no context current. In 5.4 the problem is solved by removing the
tracking altogether. Here QQuickWidget is fixed to play nice and
destroy QOpenGLFramebufferObject always with the context current.

Task-number: QTBUG-39389
Change-Id: Ic6917696ed61f284d661a578c9c7f2e0673c412d
Reviewed-by: Gunnar Sletta <gunnar.sletta@jollamobile.com>

Make sure the context/surface are still alive and current while destroying
the render control.

Task-number: QTBUG-39034
Change-Id: I6ff0069985a9121a63025bfb165493b3f003391d
Reviewed-by: Gunnar Sletta <gunnar.sletta@jollamobile.com>

Relay drag/drop events to the offscreen QQuickWindow.

Task-number: QTBUG-39167
Change-Id: Iaf59fb899d16ac96fc94f1df8c3a939e9bd0f92f
Reviewed-by: Jørgen Lind <jorgen.lind@digia.com>

Change-Id: I9b8673fb3292c9d5ad2f9e8e63f56dc661699be6
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>

If the platform plugin does not support the features needed
for QQuickWidget, then don't try to use it. This is a minimal
change to stop applications from crashing: it does not give
the application a way to find out if QQuickWidget is supported,
since that would mean new API, which we can't do in a patch
release.

Task-number: QTBUG-38268
Change-Id: I975a03b105b1d5c21a1d8ae440a5802ce8c1967b
Reviewed-by: Laszlo Agocs <laszlo.agocs@digia.com>

Relay focus in/out events to the offscreen QQuickWindow, and also
make the offscreen window believe it has the focus when the
render window has it.

Task-number: QTBUG-39033
Change-Id: Ib50b134e635833ad3813693ca272f04607c525b8
Reviewed-by: Laszlo Agocs <laszlo.agocs@digia.com>

Task-number: QTBUG-38564
Change-Id: Ice1170339f7d650fcb6accfccf325471629343d6
Reviewed-by: Sean Harmer <sean.harmer@kdab.com>

When using a QQuickWidget, the QQuickWindow is hidden and the contents
are displayed in another window. Some components need to query the actual
window, e.g. when positioning a popup.

Task-number: QTBUG-38116
Change-Id: I34452be2179ccc9e216e4d89264dc700e0cf42a0
Reviewed-by: Gunnar Sletta <gunnar.sletta@jollamobile.com>

This removes QSGContext::sharedOpenGLContext and replace its uses
with QOpenGLContextPrivate::globalShareContext, which is also going
to be used by QOpenGLWidget and QQuickWidget.

Change-Id: I1e296c3e6832f717caaf31ba7d7b27c06249219b
Reviewed-by: Laszlo Agocs <laszlo.agocs@digia.com>

Although the documentation is part of Qt Quick, a separate
module page with a \qtvariable command is still needed to
have correct information about which module to link against.

Task-number: QTBUG-37272
Change-Id: Ie00e9418be4feec299cb36c526ca366504c89008
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
Reviewed-by: Jerome Pasion <jerome.pasion@digia.com>
Reviewed-by: Lars Knoll <lars.knoll@digia.com>

Change-Id: I5d4b3e26742202c4b634d0001fd3658c7263c50a
Reviewed-by: Alan Alpert <aalpert@blackberry.com>

There were two problems: 1) QWidget does not have a default size of (0,0)
or (1,1), but uses WA_Resized. 2) event() would eat timer events without
checking the timerId.

Change-Id: I355acbb10d3d5073e117c29de18bb94857881141
Reviewed-by: Laszlo Agocs <laszlo.agocs@digia.com>

Change-Id: I3cc584e8ff980cd4328639a5e98241713a13cb04
Reviewed-by: Paul Olav Tvete <paul.tvete@digia.com>

Change-Id: Id72a042588e37832a0d3757bad935c531ef8275a
Reviewed-by: Jędrzej Nowacki <jedrzej.nowacki@digia.com>

Because QtQuickWidgets is part of Qt Quick module documentation,
its examples need to also be moved under the examples/quick
directory structure.

This change moves the example, creates minimal documentation
for it, and adds a link to it from the QQuickWidget class
reference.

Task-number: QTBUG-37272
Change-Id: Iffb67849f150b9aaf0edaef5852364e93f7752b8
Reviewed-by: Jerome Pasion <jerome.pasion@digia.com>
Reviewed-by: Lars Knoll <lars.knoll@digia.com>

Add QQuickWidget::sceneGraphError() equivalent to
QQuickWindow::sceneGraphError(), move message formatting code
to QQuickWindowPrivate.

Change-Id: I18cd4d7e0f6ee1011c29375218dc6a044b0d2cf2
Reviewed-by: Laszlo Agocs <laszlo.agocs@digia.com>

forceRendering was introduced for QQuickWidget, but QQuickWidget
now has full control of when the rendering functions are called. It
makes more sense to not call the QQuickRenderControl functions, than to
set a flag on QQuickWidget that decides whether those functions have any
effect.

Change-Id: I69819b13000120c04cecd1a467c08e8df9330df8
Reviewed-by: Gunnar Sletta <gunnar.sletta@jollamobile.com>

Fix qdoc warnings, do some editing and cross-link between
QQuickWidget and QQuickView class references.

Task-number: QTBUG-37272
Change-Id: I48d3a01e7c6315be329e24a5c5f7635697629316
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
Reviewed-by: Jerome Pasion <jerome.pasion@digia.com>

Resizing to an empty size needs to be handled as if the widget was
hidden. Restoring to a non-empty size is like a show, except that we
are rendering synchronously.

Task-number: QTBUG-37046
Change-Id: I572e4763c4a28bfe7347868e109acca5b357db50
Reviewed-by: Laszlo Agocs <laszlo.agocs@digia.com>
Reviewed-by: Gunnar Sletta <gunnar.sletta@jollamobile.com>

When the toplevel window changes, QQuickWidget needs to recreate
the context so it is compatible with the new window.

Change-Id: Ic7c3410061a33f223e20e3d1f93437917abcff18
Reviewed-by: Laszlo Agocs <laszlo.agocs@digia.com>

We cannot be sure that the toplevel widget has the correct GL format,
and we do not want to force depth and stencil buffers on surfaces that
do not need them. Therefore, we have to create an offscreen surface for
the FBO.

Change-Id: I7dfc3a6f84bf79125f3ab811a204972e95e245a3
Reviewed-by: Laszlo Agocs <laszlo.agocs@digia.com>

Task-number: QTBUG-37062
Change-Id: I3763385168eaa0ccd009ada563f56ea0251029a5
Reviewed-by: Gunnar Sletta <gunnar.sletta@jollamobile.com>

Task-number: QTBUG-36935
Change-Id: I498561f6bbd5a9b279034d16ef5ae4fb36607ed3
Reviewed-by: Laszlo Agocs <laszlo.agocs@digia.com>

Change-Id: Idb444cbc62491469230c5a1f624d71cf20bce492
Reviewed-by: Paul Olav Tvete <paul.tvete@digia.com>

Change-Id: I34f2015d63d3052b401a82bb4ac7340af94dca8c
Reviewed-by: Paul Olav Tvete <paul.tvete@digia.com>