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/*
* Copyright (C) 2010, 2011 Nokia Corporation and/or its subsidiary(-ies)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this program; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
#include "config.h"
#include "QtSGUpdateQueue.h"
#include "PassOwnPtr.h"
#include "QtSGTileNode.h"
#include <QtQuick/QQuickItem>
namespace WebKit {
struct NodeUpdateCreateTile : public NodeUpdate {
NodeUpdateCreateTile(int nodeID, float scale)
: NodeUpdate(CreateTile)
, nodeID(nodeID)
, scale(scale)
{ }
int nodeID;
float scale;
};
struct NodeUpdateRemoveTile : public NodeUpdate {
NodeUpdateRemoveTile(int nodeID)
: NodeUpdate(RemoveTile)
, nodeID(nodeID)
{ }
int nodeID;
};
struct NodeUpdateSetBackBuffer : public NodeUpdate {
NodeUpdateSetBackBuffer(int nodeID, const QImage& backBuffer, const QRect& sourceRect, const QRect& targetRect)
: NodeUpdate(SetBackBuffer)
, nodeID(nodeID)
, backBuffer(backBuffer)
, sourceRect(sourceRect)
, targetRect(targetRect)
{ }
int nodeID;
QImage backBuffer;
QRect sourceRect;
QRect targetRect;
};
struct NodeUpdateSwapTileBuffers : public NodeUpdate {
NodeUpdateSwapTileBuffers()
: NodeUpdate(SwapTileBuffers)
{ }
};
QtSGUpdateQueue::QtSGUpdateQueue(QQuickItem *item)
: item(item)
, lastScale(0)
, lastScaleNode(0)
, nextNodeID(1)
, m_isSwapPending(false)
{
}
int QtSGUpdateQueue::createTileNode(float scale)
{
int nodeID = nextNodeID++;
nodeUpdateQueue.append(adoptPtr(new NodeUpdateCreateTile(nodeID, scale)));
item->update();
return nodeID;
}
void QtSGUpdateQueue::removeTileNode(int nodeID)
{
nodeUpdateQueue.append(adoptPtr(new NodeUpdateRemoveTile(nodeID)));
item->update();
}
void QtSGUpdateQueue::setNodeBackBuffer(int nodeID, const QImage& backBuffer, const QRect& sourceRect, const QRect& targetRect)
{
nodeUpdateQueue.append(adoptPtr(new NodeUpdateSetBackBuffer(nodeID, backBuffer, sourceRect, targetRect)));
item->update();
}
void QtSGUpdateQueue::swapTileBuffers()
{
nodeUpdateQueue.append(adoptPtr(new NodeUpdateSwapTileBuffers()));
m_isSwapPending = true;
item->update();
}
void QtSGUpdateQueue::applyUpdates(QSGNode* itemNode)
{
while (!nodeUpdateQueue.isEmpty()) {
OwnPtr<NodeUpdate> nodeUpdate(nodeUpdateQueue.takeFirst());
switch (nodeUpdate->type) {
case NodeUpdate::CreateTile: {
NodeUpdateCreateTile* createTileUpdate = static_cast<NodeUpdateCreateTile*>(nodeUpdate.get());
QtSGTileNode* tileNode = new QtSGTileNode(item->sceneGraphEngine());
getScaleNode(createTileUpdate->scale, itemNode)->prependChildNode(tileNode);
nodes.set(createTileUpdate->nodeID, tileNode);
break;
}
case NodeUpdate::RemoveTile: {
NodeUpdateRemoveTile* removeUpdate = static_cast<NodeUpdateRemoveTile*>(nodeUpdate.get());
QSGNode* node = nodes.take(removeUpdate->nodeID);
QSGNode* scaleNode = node->parent();
scaleNode->removeChildNode(node);
if (!scaleNode->childCount()) {
if (scaleNode == lastScaleNode) {
lastScale = 0;
lastScaleNode = 0;
}
delete scaleNode;
}
delete node;
break;
}
case NodeUpdate::SetBackBuffer: {
NodeUpdateSetBackBuffer* setBackBufferUpdate = static_cast<NodeUpdateSetBackBuffer*>(nodeUpdate.get());
QtSGTileNode* tileNode = nodes.get(setBackBufferUpdate->nodeID);
tileNode->setBackBuffer(setBackBufferUpdate->backBuffer, setBackBufferUpdate->sourceRect, setBackBufferUpdate->targetRect);
break;
}
case NodeUpdate::SwapTileBuffers: {
HashMap<int, QtSGTileNode*>::iterator end = nodes.end();
for (HashMap<int, QtSGTileNode*>::iterator it = nodes.begin(); it != end; ++it)
it->second->swapBuffersIfNeeded();
m_isSwapPending = false;
break;
}
default:
ASSERT_NOT_REACHED();
}
}
}
QSGNode* QtSGUpdateQueue::getScaleNode(float scale, QSGNode* itemNode)
{
if (scale == lastScale)
return lastScaleNode;
QSGTransformNode* scaleNode = new QSGTransformNode;
QMatrix4x4 scaleMatrix;
// Use scale(float,float) to prevent scaling the Z component.
// Reverse the item's transform scale since our tiles were generated for this specific scale.
scaleMatrix.scale(1 / scale, 1 / scale);
scaleNode->setMatrix(scaleMatrix);
// Prepend instead of append to paint the new, incomplete, scale before/behind the previous one.
itemNode->prependChildNode(scaleNode);
lastScale = scale;
lastScaleNode = scaleNode;
return lastScaleNode;
}
}
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