Quick: Support reparenting

To support reparenting, we make the compositing surface independent of
the window by using gfx::TEXTURE_TRANSPORT. We also need to be able to
keep frame data across window changes so we can reconstruct the QSGNode
tree in a new context, so extract that data into DelegatedFrameNodeData
class. Any context-specific data is still stored in DelegatedFrameNode.

Also hook up window changes to WebContents::WasShown/Hidden for Quick.
Remove checking of Qt isVisible state, this mechanism is used to sync
Chromium with Qt, not the other way around. WasShown/Hidden is
orthogonal to Show/Hide, and can use different triggers. However for
Widgets it probably makes sense to hook both up to widget visibility.

Change-Id: I1ef4b50cd61b8e54b791e03f0b41929c42fec8bf
Reviewed-by: Jocelyn Turcotte <jocelyn.turcotte@digia.com>

1 files changed, 12 insertions, 2 deletions

diff --git a/src/core/delegated_frame_node.h b/src/core/delegated_frame_node.h
index b73370874..2a4ae53d0 100644
--- a/src/core/delegated_frame_node.h
+++ b/src/core/delegated_frame_node.h
@@ -42,9 +42,11 @@
 #ifndef DELEGATED_FRAME_NODE_H
 #define DELEGATED_FRAME_NODE_H
 
+#include "base/memory/scoped_ptr.h"
 #include "cc/resources/transferable_resource.h"
 #include <QMutex>
 #include <QSGNode>
+#include <QSharedData>
 #include <QSharedPointer>
 #include <QWaitCondition>
 
@@ -61,17 +63,25 @@ class DelegatedFrameData;
 class MailboxTexture;
 class RenderPassTexture;
 
+// Separating this data allows another DelegatedFrameNode to reconstruct the QSGNode tree from the mailbox textures
+// and render pass information.
+class DelegatedFrameNodeData : public QSharedData {
+public:
+    QHash<unsigned, QSharedPointer<MailboxTexture> > mailboxTextures;
+    scoped_ptr<cc::DelegatedFrameData> frameData;
+};
+
 class DelegatedFrameNode : public QSGNode {
 public:
     DelegatedFrameNode(QQuickWindow *window);
     ~DelegatedFrameNode();
     void preprocess();
-    void commit(cc::DelegatedFrameData *frameData, cc::TransferableResourceArray *resourcesToRelease);
+    void commit(DelegatedFrameNodeData* data, cc::ReturnedResourceArray *resourcesToRelease);
 
 private:
+    QExplicitlySharedDataPointer<DelegatedFrameNodeData> m_data;
     QQuickWindow *m_window;
     QList<QSharedPointer<RenderPassTexture> > m_renderPassTextures;
-    QMap<int, QSharedPointer<MailboxTexture> > m_mailboxTextures;
     int m_numPendingSyncPoints;
     QWaitCondition m_mailboxesFetchedWaitCond;
     QMutex m_mutex;