<commit_before>/****************************************************************************
**
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the QtQml module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia.  For licensing terms and
** conditions see http://qt.digia.com/licensing.  For further information
** use the contact form at http://qt.digia.com/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Digia gives you certain additional
** rights.  These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include <private/qsgadaptationlayer_p.h>
#include "qquickcanvasitem_p.h"
#include <private/qquickitem_p.h>
#include <private/qquickcanvascontext_p.h>
#include <private/qquickcontext2d_p.h>
#include <qsgsimpletexturenode.h>
#include <QtQuick/private/qquickpixmapcache_p.h>

#include <qqmlinfo.h>
#include <private/qqmlengine_p.h>
#include <QtCore/QBuffer>

QT_BEGIN_NAMESPACE

QQuickCanvasPixmap::QQuickCanvasPixmap(const QImage& image, QQuickWindow *window)
    : m_pixmap(0)
    , m_image(image)
    , m_texture(0)
    , m_window(window)
{

}

QQuickCanvasPixmap::QQuickCanvasPixmap(QQuickPixmap *pixmap, QQuickWindow *window)
    : m_pixmap(pixmap)
    , m_texture(0)
    , m_window(window)
{

}

QQuickCanvasPixmap::~QQuickCanvasPixmap()
{
    delete m_pixmap;
    if (m_texture)
        m_texture->deleteLater();
}

qreal QQuickCanvasPixmap::width() const
{
    if (m_pixmap)
        return m_pixmap->width();

    return m_image.width();
}

qreal QQuickCanvasPixmap::height() const
{
    if (m_pixmap)
        return m_pixmap->height();

    return m_image.height();
}

bool QQuickCanvasPixmap::isValid() const
{
    if (m_pixmap)
        return m_pixmap->isReady();
    return !m_image.isNull();
}

QSGTexture *QQuickCanvasPixmap::texture()
{
    if (!m_texture) {
        if (m_pixmap) {
            Q_ASSERT(m_pixmap->textureFactory());
            m_texture = m_pixmap->textureFactory()->createTexture(m_window);
        } else {
            m_texture = QQuickWindowPrivate::get(m_window)->context->createTexture(m_image);
        }
    }
    return m_texture;
}
QImage QQuickCanvasPixmap::image()
{
    if (m_image.isNull() && m_pixmap)
        m_image = m_pixmap->image();

    return m_image;
}

QHash<QQmlEngine *,QQuickContext2DRenderThread*> QQuickContext2DRenderThread::renderThreads;
QMutex QQuickContext2DRenderThread::renderThreadsMutex;

QQuickContext2DRenderThread::QQuickContext2DRenderThread(QQmlEngine *eng)
    : QThread(eng), m_engine(eng), m_eventLoopQuitHack(0)
{
    Q_ASSERT(eng);
    m_eventLoopQuitHack = new QObject;
    m_eventLoopQuitHack->moveToThread(this);
    connect(m_eventLoopQuitHack, SIGNAL(destroyed(QObject*)), SLOT(quit()), Qt::DirectConnection);
    start(QThread::IdlePriority);
}

QQuickContext2DRenderThread::~QQuickContext2DRenderThread()
{
    renderThreadsMutex.lock();
    renderThreads.remove(m_engine);
    renderThreadsMutex.unlock();

    m_eventLoopQuitHack->deleteLater();
    wait();
}

QQuickContext2DRenderThread *QQuickContext2DRenderThread::instance(QQmlEngine *engine)
{
    QQuickContext2DRenderThread *thread = 0;
    renderThreadsMutex.lock();
    if (renderThreads.contains(engine))
        thread = renderThreads.value(engine);
    else {
        thread = new QQuickContext2DRenderThread(engine);
        renderThreads.insert(engine, thread);
    }
    renderThreadsMutex.unlock();
    return thread;
}

class QQuickCanvasItemPrivate : public QQuickItemPrivate
{
public:
    QQuickCanvasItemPrivate();
    ~QQuickCanvasItemPrivate();
    QQuickCanvasContext *context;
    QSizeF canvasSize;
    QSize tileSize;
    QRectF canvasWindow;
    QRectF dirtyRect;
    uint hasCanvasSize :1;
    uint hasTileSize :1;
    uint hasCanvasWindow :1;
    uint available :1;
    QQuickCanvasItem::RenderTarget renderTarget;
    QQuickCanvasItem::RenderStrategy renderStrategy;
    QString contextType;
    QHash<QUrl, QQmlRefPointer<QQuickCanvasPixmap> > pixmaps;
    QUrl baseUrl;
    QMap<int, v8::Persistent<v8::Function> > animationCallbacks;
};

QQuickCanvasItemPrivate::QQuickCanvasItemPrivate()
    : QQuickItemPrivate()
    , context(0)
    , canvasSize(1, 1)
    , tileSize(1, 1)
    , hasCanvasSize(false)
    , hasTileSize(false)
    , hasCanvasWindow(false)
    , available(false)
    , renderTarget(QQuickCanvasItem::Image)
    , renderStrategy(QQuickCanvasItem::Cooperative)
{
    antialiasing = true;
}

QQuickCanvasItemPrivate::~QQuickCanvasItemPrivate()
{
    pixmaps.clear();
}


/*!
    \qmltype Canvas
    \instantiates QQuickCanvasItem
    \inqmlmodule QtQuick 2
    \since QtQuick 2.0
    \inherits Item
    \ingroup qtquick-canvas
    \ingroup qtquick-visual
    \brief Provides a 2D canvas item enabling drawing via JavaScript

    The Canvas item allows drawing of straight and curved lines, simple and
    complex shapes, graphs, and referenced graphic images.  It can also add
    text, colors, shadows, gradients, and patterns, and do low level pixel
    operations. The Canvas output may be saved as an image file or serialized
    to a URL.

    To define a drawing area in the Canvas item set the \c width and \c height
    properties.  For example, the following code creates a Canvas item which
    has a drawing area with a height of 100 pixels and width of 200 pixels:
    \qml
    import QtQuick 2.0
    Canvas {
        id: mycanvas
        width: 100
        height: 200
    }
    \endqml

    Currently the Canvas item only supports the two-dimensional rendering context.

    \section1 Threaded Rendering and Render Target

    The Canvas item supports two render targets: \c Canvas.Image and
    \c Canvas.FramebufferObject.

    The \c Canvas.Image render target is a \a QImage object.  This render
    target supports background thread rendering, allowing complex or long
    running painting to be executed without blocking the UI.

    The Canvas.FramebufferObject render target utilizes OpenGL hardware
    acceleration rather than rendering into system memory, which in many cases
    results in faster rendering.

    The default render target is Canvas.Image and the default renderStrategy is
    Canvas.Cooperative.

    \section1 Tiled Canvas
    The Canvas item supports tiled rendering by setting \l canvasSize, \l tileSize
    and \l canvasWindow properties.

    Tiling allows efficient display of a very large virtual canvas via a smaller
    canvas window. The actual memory consumption is in relation to the canvas
    window size.  The painting code can draw within the virtual canvas without
    handling coordinate system transformations.

    The tiles overlapping with the canvas window may be cached eliminating the
    need to redraw, which can lead to significantly improved performance in
    some situations.

    \section1 Pixel Operations
    All HTML5 2D context pixel operations are supported. In order to ensure
    improved pixel reading/writing performance the \a Canvas.Image render
    target should be chosen. The \a Canvas.FramebufferObject render target
    requires the pixel data to be exchanged between the system memory and the
    graphic card, which is significantly more expensive.  Rendering may also be
    synchronized with the V-sync signal (to avoid
    \l{http://en.wikipedia.org/wiki/Screen_tearing}{screen tearing}) which will further
    impact pixel operations with \c Canvas.FrambufferObject render target.

    \section1 Tips for Porting Existing HTML5 Canvas applications

    Although the Canvas item is provides a HTML5 like API, HTML5 canvas
    applications need to be modified to run in the Canvas item:
    \list
    \li Replace all DOM API calls with QML property bindings or Canvas item methods.
    \li Replace all HTML event handlers with the MouseArea item.
    \li Change setInterval/setTimeout function calls with the \l Timer item or
       the use of requestAnimationFrame().
    \li Place painting code into the onPaint handler and trigger
       painting by calling the markDirty() or requestPaint() methods.
    \li To draw images, load them by calling the Canvas's loadImage() method and then request to paint
       them in the onImageLoaded handler.
    \endlist

    \sa Context2D
*/

QQuickCanvasItem::QQuickCanvasItem(QQuickItem *parent)
    : QQuickItem(*(new QQuickCanvasItemPrivate), parent)
{
    setFlag(ItemHasContents);
}

QQuickCanvasItem::~QQuickCanvasItem()
{
    Q_D(QQuickCanvasItem);
    delete d->context;
}

/*!
    \qmlproperty size QtQuick2::Canvas::available

    Indicates when Canvas is able to provide a drawing context to operate on.
*/

bool QQuickCanvasItem::isAvailable() const
{
    return d_func()->available;
}

/*!
    \qmlproperty string QtQuick2::Canvas::contextType
    The type of drawing context to use.

    This property is set to the name of the active context type.

    If set explicitly the canvas will attempt to create a context of the
    named type after becoming available.

    The type name is the same as used in the getContext() call, for the 2d
    canvas the value will be "2d".

    \sa getContext(), available
*/

QString QQuickCanvasItem::contextType() const
{
    return d_func()->contextType;
}

void QQuickCanvasItem::setContextType(const QString &contextType)
{
    Q_D(QQuickCanvasItem);

    if (contextType.compare(d->contextType, Qt::CaseInsensitive) == 0)
        return;

    if (d->context) {
        qmlInfo(this) << "Canvas already initialized with a different context type";
        return;
    }

    d->contextType = contextType;

    if (d->available)
        createContext(contextType);

    emit contextTypeChanged();
}

/*!
    \qmlproperty object QtQuick2::Canvas::context
    Holds the active drawing context.

    If the canvas is ready and there has been a successful call to getContext()
    or the contextType property has been set with a supported context type,
    this property will contain the current drawing context, otherwise null.
*/

QQmlV8Handle QQuickCanvasItem::context() const
{
    Q_D(const QQuickCanvasItem);
    if (d->context)
        return QQmlV8Handle::fromHandle(d->context->v8value());

    return QQmlV8Handle::fromHandle(v8::Null());
}

/*!
    \qmlproperty size QtQuick2::Canvas::canvasSize
    Holds the logical canvas size that the context paints on.

    By default, the canvas size is the same size as the current canvas item
    size.

    By setting the canvasSize, tileSize and canvasWindow, the Canvas item can
    act as a large virtual canvas with many separately rendered tile rectangles.
    Only those tiles within the current canvas window are painted by the Canvas
    render engine.

    \sa tileSize, canvasWindow
*/
QSizeF QQuickCanvasItem::canvasSize() const
{
    Q_D(const QQuickCanvasItem);
    return d->canvasSize;
}

void QQuickCanvasItem::setCanvasSize(const QSizeF & size)
{
    Q_D(QQuickCanvasItem);
    if (d->canvasSize != size) {
        d->hasCanvasSize = true;
        d->canvasSize = size;
        emit canvasSizeChanged();

        if (d->context)
            polish();
    }
}

/*!
    \qmlproperty size QtQuick2::Canvas::tileSize
    Holds the canvas rendering tile size.

    The Canvas item enters tiled mode by setting canvasSize, tileSize and the
    canvasWindow. This can improve rendering performance by rendering and
    caching tiles instead of rendering the whole canvas every time.

    Memory will be consumed only by those tiles within the current visible
    region.

    By default the tileSize is the same as the canvasSize.

    \sa canvasSize, canvasWindow
*/
QSize QQuickCanvasItem::tileSize() const
{
    Q_D(const QQuickCanvasItem);
    return d->tileSize;
}

void QQuickCanvasItem::setTileSize(const QSize & size)
{
    Q_D(QQuickCanvasItem);
    if (d->tileSize != size) {
        d->hasTileSize = true;
        d->tileSize = size;

        emit tileSizeChanged();

        if (d->context)
            polish();
    }
}

/*!
    \qmlproperty rect QtQuick2::Canvas::canvasWindow
     Holds the current canvas visible window.

     By default the canvasWindow size is the same as the Canvas item size with
     the top-left point as (0, 0).

     If the canvasSize is different to the Canvas item size, the Canvas item
     can display different visible areas by changing the canvas windowSize
     and/or position.

    \sa canvasSize, tileSize
*/
QRectF QQuickCanvasItem::canvasWindow() const
{
    Q_D(const QQuickCanvasItem);
    return d->canvasWindow;
}

void QQuickCanvasItem::setCanvasWindow(const QRectF& rect)
{
    Q_D(QQuickCanvasItem);
    if (d->canvasWindow != rect) {
        d->canvasWindow = rect;

        d->hasCanvasWindow = true;
        emit canvasWindowChanged();

        if (d->context)
            polish();
    }
}

/*!
    \qmlproperty enumeration QtQuick2::Canvas::renderTarget
    Holds the current canvas render target.

    \list
    \li Canvas.Image  - render to an in memory image buffer.
    \li Canvas.FramebufferObject - render to an OpenGL frame buffer
    \endlist

    This hint is supplied along with renderStrategy to the graphics context to
    determine the method of rendering. A renderStrategy, renderTarget or a
    combination may not be supported by a graphics context, in which case the
    context will choose appropriate options and Canvas will signal the change
    to the properties.

    The default render target is \c Canvas.FramebufferObject.
*/
QQuickCanvasItem::RenderTarget QQuickCanvasItem::renderTarget() const
{
    Q_D(const QQuickCanvasItem);
    return d->renderTarget;
}

void QQuickCanvasItem::setRenderTarget(QQuickCanvasItem::RenderTarget target)
{
    Q_D(QQuickCanvasItem);
    if (d->renderTarget != target) {
        if (d->context) {
            qmlInfo(this) << "Canvas:renderTarget not changeble once context is active.";
            return;
        }

        d->renderTarget = target;
        emit renderTargetChanged();
    }
}

/*!
    \qmlproperty enumeration QtQuick2::Canvas::renderStrategy
    Holds the current canvas rendering strategy.

    \list
    \li Canvas.Immediate - context will perform graphics commands immediately in the main UI thread.
    \li Canvas.Threaded - context will defer graphics commands to a private rendering thread.
    \li Canvas.Cooperative - context will defer graphics commands to the applications global render thread.
    \endlist

    This hint is supplied along with renderTarget to the graphics context to
    determine the method of rendering. A renderStrategy, renderTarget or a
    combination may not be supported by a graphics context, in which case the
    context will choose appropriate options and Canvas will signal the change
    to the properties.

    Configuration or runtime tests may cause the QML Scene Graph to render in
    the GUI thread.  Selecting \c Canvas.Cooperative, does not guarantee
    rendering will occur on a thread separate from the GUI thread.

    The default value is \c Canvas.Cooperative.

    \sa renderTarget
*/

QQuickCanvasItem::RenderStrategy QQuickCanvasItem::renderStrategy() const
{
    return d_func()->renderStrategy;
}

void QQuickCanvasItem::setRenderStrategy(QQuickCanvasItem::RenderStrategy strategy)
{
    Q_D(QQuickCanvasItem);
    if (d->renderStrategy != strategy) {
        if (d->context) {
            qmlInfo(this) << "Canvas:renderStrategy not changeable once context is active.";
            return;
        }
        d->renderStrategy = strategy;
        emit renderStrategyChanged();
    }
}

QQuickCanvasContext* QQuickCanvasItem::rawContext() const
{
    return d_func()->context;
}

bool QQuickCanvasItem::isPaintConnected()
{
    IS_SIGNAL_CONNECTED(this, QQuickCanvasItem, paint, (const QRect &));
}

void QQuickCanvasItem::sceneGraphInitialized()
{
    Q_D(QQuickCanvasItem);

    d->available = true;
    connect(this, SIGNAL(visibleChanged()), SLOT(checkAnimationCallbacks()));
    QMetaObject::invokeMethod(this, "availableChanged", Qt::QueuedConnection);

    if (!d->contextType.isNull())
        QMetaObject::invokeMethod(this, "delayedCreate", Qt::QueuedConnection);
    else if (isPaintConnected())
        QMetaObject::invokeMethod(this, "requestPaint", Qt::QueuedConnection);
}

void QQuickCanvasItem::geometryChanged(const QRectF &newGeometry, const QRectF &oldGeometry)
{
    Q_D(QQuickCanvasItem);

    QQuickItem::geometryChanged(newGeometry, oldGeometry);

    QSizeF newSize = newGeometry.size();
    if (!d->hasCanvasSize && d->canvasSize != newSize) {
        d->canvasSize = newSize;
        emit canvasSizeChanged();
    }

    if (!d->hasTileSize && d->tileSize != newSize) {
        d->tileSize = newSize.toSize();
        emit tileSizeChanged();
    }

    const QRectF rect = QRectF(QPointF(0, 0), newSize);

    if (!d->hasCanvasWindow && d->canvasWindow != rect) {
        d->canvasWindow = rect;
        emit canvasWindowChanged();
    }

    if (d->available)
        requestPaint();
}

void QQuickCanvasItem::releaseResources()
{
    Q_D(QQuickCanvasItem);

    if (d->context) {
        delete d->context;
        d->context = 0;
    }
}

void QQuickCanvasItem::componentComplete()
{
    QQuickItem::componentComplete();

    Q_D(QQuickCanvasItem);
    d->baseUrl = qmlEngine(this)->contextForObject(this)->baseUrl();
}

void QQuickCanvasItem::itemChange(QQuickItem::ItemChange change, const QQuickItem::ItemChangeData &value)
{
    QQuickItem::itemChange(change, value);
    if (change != QQuickItem::ItemSceneChange)
        return;

    Q_D(QQuickCanvasItem);
    if (d->available)
        return;

    if (value.window== 0)
        return;

    d->window = value.window;
    if (d->window->openglContext() != 0) // available context == initialized
        sceneGraphInitialized();
    else
        connect(d->window, SIGNAL(sceneGraphInitialized()), SLOT(sceneGraphInitialized()));
}

void QQuickCanvasItem::updatePolish()
{
    QQuickItem::updatePolish();

    Q_D(QQuickCanvasItem);

    if (d->context)
        d->context->prepare(d->canvasSize.toSize(), d->tileSize, d->canvasWindow.toRect(), d->dirtyRect.toRect(), d->smooth, d->antialiasing);

    if (d->animationCallbacks.size() > 0 && isVisible()) {
        QMap<int, v8::Persistent<v8::Function> > animationCallbacks = d->animationCallbacks;
        d->animationCallbacks.clear();

        foreach (int key, animationCallbacks.keys()) {
            v8::HandleScope handle_scope;
            v8::Handle<v8::Object> self = QQmlEnginePrivate::getV8Engine(qmlEngine(this))->newQObject(this).As<v8::Object>();
            v8::Handle<v8::Value> args[] = { v8::Uint32::New(QDateTime::currentDateTimeUtc().toTime_t()) };
            v8::Persistent<v8::Function> f = animationCallbacks.value(key);
            f->Call(self, 1, args);
            f.Dispose();
        }
    }
    else {
        if (d->dirtyRect.isValid()) {
            if (d->hasTileSize && d->hasCanvasWindow)
                emit paint(tiledRect(d->canvasWindow.intersected(d->dirtyRect.toAlignedRect()), d->tileSize));
            else
                emit paint(d->dirtyRect.toRect());
            d->dirtyRect = QRectF();
        }
    }

    if (d->context) {
        if (d->renderStrategy == QQuickCanvasItem::Cooperative)
            update();
        else
            d->context->flush();
    }
}

QSGNode *QQuickCanvasItem::updatePaintNode(QSGNode *oldNode, UpdatePaintNodeData *)
{
    Q_D(QQuickCanvasItem);

    if (!d->context) {
        delete oldNode;
        return 0;
    }

    QSGSimpleTextureNode *node = static_cast<QSGSimpleTextureNode*>(oldNode);
    if (!node)
        node = new QSGSimpleTextureNode;

    if (d->smooth)
        node->setFiltering(QSGTexture::Linear);
    else
        node->setFiltering(QSGTexture::Nearest);

    if (d->renderStrategy == QQuickCanvasItem::Cooperative)
        d->context->flush();

    node->setTexture(d->context->texture());
    node->markDirty(QSGNode::DirtyMaterial);
    node->setRect(QRectF(QPoint(0, 0), d->canvasWindow.size()));
    return node;
}

/*!
    \qmlmethod object QtQuick2::Canvas::getContext(string contextId, any... args)

    Returns a drawing context or null if no context available.<commit_msg>Fix resizing canvas with renderStrategy == Cooperative<commit_after>/****************************************************************************
**
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the QtQml module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia.  For licensing terms and
** conditions see http://qt.digia.com/licensing.  For further information
** use the contact form at http://qt.digia.com/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Digia gives you certain additional
** rights.  These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include <private/qsgadaptationlayer_p.h>
#include "qquickcanvasitem_p.h"
#include <private/qquickitem_p.h>
#include <private/qquickcanvascontext_p.h>
#include <private/qquickcontext2d_p.h>
#include <qsgsimpletexturenode.h>
#include <QtQuick/private/qquickpixmapcache_p.h>

#include <qqmlinfo.h>
#include <private/qqmlengine_p.h>
#include <QtCore/QBuffer>

QT_BEGIN_NAMESPACE

QQuickCanvasPixmap::QQuickCanvasPixmap(const QImage& image, QQuickWindow *window)
    : m_pixmap(0)
    , m_image(image)
    , m_texture(0)
    , m_window(window)
{

}

QQuickCanvasPixmap::QQuickCanvasPixmap(QQuickPixmap *pixmap, QQuickWindow *window)
    : m_pixmap(pixmap)
    , m_texture(0)
    , m_window(window)
{

}

QQuickCanvasPixmap::~QQuickCanvasPixmap()
{
    delete m_pixmap;
    if (m_texture)
        m_texture->deleteLater();
}

qreal QQuickCanvasPixmap::width() const
{
    if (m_pixmap)
        return m_pixmap->width();

    return m_image.width();
}

qreal QQuickCanvasPixmap::height() const
{
    if (m_pixmap)
        return m_pixmap->height();

    return m_image.height();
}

bool QQuickCanvasPixmap::isValid() const
{
    if (m_pixmap)
        return m_pixmap->isReady();
    return !m_image.isNull();
}

QSGTexture *QQuickCanvasPixmap::texture()
{
    if (!m_texture) {
        if (m_pixmap) {
            Q_ASSERT(m_pixmap->textureFactory());
            m_texture = m_pixmap->textureFactory()->createTexture(m_window);
        } else {
            m_texture = QQuickWindowPrivate::get(m_window)->context->createTexture(m_image);
        }
    }
    return m_texture;
}
QImage QQuickCanvasPixmap::image()
{
    if (m_image.isNull() && m_pixmap)
        m_image = m_pixmap->image();

    return m_image;
}

QHash<QQmlEngine *,QQuickContext2DRenderThread*> QQuickContext2DRenderThread::renderThreads;
QMutex QQuickContext2DRenderThread::renderThreadsMutex;

QQuickContext2DRenderThread::QQuickContext2DRenderThread(QQmlEngine *eng)
    : QThread(eng), m_engine(eng), m_eventLoopQuitHack(0)
{
    Q_ASSERT(eng);
    m_eventLoopQuitHack = new QObject;
    m_eventLoopQuitHack->moveToThread(this);
    connect(m_eventLoopQuitHack, SIGNAL(destroyed(QObject*)), SLOT(quit()), Qt::DirectConnection);
    start(QThread::IdlePriority);
}

QQuickContext2DRenderThread::~QQuickContext2DRenderThread()
{
    renderThreadsMutex.lock();
    renderThreads.remove(m_engine);
    renderThreadsMutex.unlock();

    m_eventLoopQuitHack->deleteLater();
    wait();
}

QQuickContext2DRenderThread *QQuickContext2DRenderThread::instance(QQmlEngine *engine)
{
    QQuickContext2DRenderThread *thread = 0;
    renderThreadsMutex.lock();
    if (renderThreads.contains(engine))
        thread = renderThreads.value(engine);
    else {
        thread = new QQuickContext2DRenderThread(engine);
        renderThreads.insert(engine, thread);
    }
    renderThreadsMutex.unlock();
    return thread;
}

class QQuickCanvasItemPrivate : public QQuickItemPrivate
{
public:
    QQuickCanvasItemPrivate();
    ~QQuickCanvasItemPrivate();
    QQuickCanvasContext *context;
    QSizeF canvasSize;
    QSize tileSize;
    QRectF canvasWindow;
    QRectF dirtyRect;
    uint hasCanvasSize :1;
    uint hasTileSize :1;
    uint hasCanvasWindow :1;
    uint available :1;
    QQuickCanvasItem::RenderTarget renderTarget;
    QQuickCanvasItem::RenderStrategy renderStrategy;
    QString contextType;
    QHash<QUrl, QQmlRefPointer<QQuickCanvasPixmap> > pixmaps;
    QUrl baseUrl;
    QMap<int, v8::Persistent<v8::Function> > animationCallbacks;
};

QQuickCanvasItemPrivate::QQuickCanvasItemPrivate()
    : QQuickItemPrivate()
    , context(0)
    , canvasSize(1, 1)
    , tileSize(1, 1)
    , hasCanvasSize(false)
    , hasTileSize(false)
    , hasCanvasWindow(false)
    , available(false)
    , renderTarget(QQuickCanvasItem::Image)
    , renderStrategy(QQuickCanvasItem::Cooperative)
{
    antialiasing = true;
}

QQuickCanvasItemPrivate::~QQuickCanvasItemPrivate()
{
    pixmaps.clear();
}


/*!
    \qmltype Canvas
    \instantiates QQuickCanvasItem
    \inqmlmodule QtQuick 2
    \since QtQuick 2.0
    \inherits Item
    \ingroup qtquick-canvas
    \ingroup qtquick-visual
    \brief Provides a 2D canvas item enabling drawing via JavaScript

    The Canvas item allows drawing of straight and curved lines, simple and
    complex shapes, graphs, and referenced graphic images.  It can also add
    text, colors, shadows, gradients, and patterns, and do low level pixel
    operations. The Canvas output may be saved as an image file or serialized
    to a URL.

    To define a drawing area in the Canvas item set the \c width and \c height
    properties.  For example, the following code creates a Canvas item which
    has a drawing area with a height of 100 pixels and width of 200 pixels:
    \qml
    import QtQuick 2.0
    Canvas {
        id: mycanvas
        width: 100
        height: 200
    }
    \endqml

    Currently the Canvas item only supports the two-dimensional rendering context.

    \section1 Threaded Rendering and Render Target

    The Canvas item supports two render targets: \c Canvas.Image and
    \c Canvas.FramebufferObject.

    The \c Canvas.Image render target is a \a QImage object.  This render
    target supports background thread rendering, allowing complex or long
    running painting to be executed without blocking the UI.

    The Canvas.FramebufferObject render target utilizes OpenGL hardware
    acceleration rather than rendering into system memory, which in many cases
    results in faster rendering.

    The default render target is Canvas.Image and the default renderStrategy is
    Canvas.Cooperative.

    \section1 Tiled Canvas
    The Canvas item supports tiled rendering by setting \l canvasSize, \l tileSize
    and \l canvasWindow properties.

    Tiling allows efficient display of a very large virtual canvas via a smaller
    canvas window. The actual memory consumption is in relation to the canvas
    window size.  The painting code can draw within the virtual canvas without
    handling coordinate system transformations.

    The tiles overlapping with the canvas window may be cached eliminating the
    need to redraw, which can lead to significantly improved performance in
    some situations.

    \section1 Pixel Operations
    All HTML5 2D context pixel operations are supported. In order to ensure
    improved pixel reading/writing performance the \a Canvas.Image render
    target should be chosen. The \a Canvas.FramebufferObject render target
    requires the pixel data to be exchanged between the system memory and the
    graphic card, which is significantly more expensive.  Rendering may also be
    synchronized with the V-sync signal (to avoid
    \l{http://en.wikipedia.org/wiki/Screen_tearing}{screen tearing}) which will further
    impact pixel operations with \c Canvas.FrambufferObject render target.

    \section1 Tips for Porting Existing HTML5 Canvas applications

    Although the Canvas item is provides a HTML5 like API, HTML5 canvas
    applications need to be modified to run in the Canvas item:
    \list
    \li Replace all DOM API calls with QML property bindings or Canvas item methods.
    \li Replace all HTML event handlers with the MouseArea item.
    \li Change setInterval/setTimeout function calls with the \l Timer item or
       the use of requestAnimationFrame().
    \li Place painting code into the onPaint handler and trigger
       painting by calling the markDirty() or requestPaint() methods.
    \li To draw images, load them by calling the Canvas's loadImage() method and then request to paint
       them in the onImageLoaded handler.
    \endlist

    \sa Context2D
*/

QQuickCanvasItem::QQuickCanvasItem(QQuickItem *parent)
    : QQuickItem(*(new QQuickCanvasItemPrivate), parent)
{
    setFlag(ItemHasContents);
}

QQuickCanvasItem::~QQuickCanvasItem()
{
    Q_D(QQuickCanvasItem);
    delete d->context;
}

/*!
    \qmlproperty size QtQuick2::Canvas::available

    Indicates when Canvas is able to provide a drawing context to operate on.
*/

bool QQuickCanvasItem::isAvailable() const
{
    return d_func()->available;
}

/*!
    \qmlproperty string QtQuick2::Canvas::contextType
    The type of drawing context to use.

    This property is set to the name of the active context type.

    If set explicitly the canvas will attempt to create a context of the
    named type after becoming available.

    The type name is the same as used in the getContext() call, for the 2d
    canvas the value will be "2d".

    \sa getContext(), available
*/

QString QQuickCanvasItem::contextType() const
{
    return d_func()->contextType;
}

void QQuickCanvasItem::setContextType(const QString &contextType)
{
    Q_D(QQuickCanvasItem);

    if (contextType.compare(d->contextType, Qt::CaseInsensitive) == 0)
        return;

    if (d->context) {
        qmlInfo(this) << "Canvas already initialized with a different context type";
        return;
    }

    d->contextType = contextType;

    if (d->available)
        createContext(contextType);

    emit contextTypeChanged();
}

/*!
    \qmlproperty object QtQuick2::Canvas::context
    Holds the active drawing context.

    If the canvas is ready and there has been a successful call to getContext()
    or the contextType property has been set with a supported context type,
    this property will contain the current drawing context, otherwise null.
*/

QQmlV8Handle QQuickCanvasItem::context() const
{
    Q_D(const QQuickCanvasItem);
    if (d->context)
        return QQmlV8Handle::fromHandle(d->context->v8value());

    return QQmlV8Handle::fromHandle(v8::Null());
}

/*!
    \qmlproperty size QtQuick2::Canvas::canvasSize
    Holds the logical canvas size that the context paints on.

    By default, the canvas size is the same size as the current canvas item
    size.

    By setting the canvasSize, tileSize and canvasWindow, the Canvas item can
    act as a large virtual canvas with many separately rendered tile rectangles.
    Only those tiles within the current canvas window are painted by the Canvas
    render engine.

    \sa tileSize, canvasWindow
*/
QSizeF QQuickCanvasItem::canvasSize() const
{
    Q_D(const QQuickCanvasItem);
    return d->canvasSize;
}

void QQuickCanvasItem::setCanvasSize(const QSizeF & size)
{
    Q_D(QQuickCanvasItem);
    if (d->canvasSize != size) {
        d->hasCanvasSize = true;
        d->canvasSize = size;
        emit canvasSizeChanged();

        if (d->context)
            polish();
    }
}

/*!
    \qmlproperty size QtQuick2::Canvas::tileSize
    Holds the canvas rendering tile size.

    The Canvas item enters tiled mode by setting canvasSize, tileSize and the
    canvasWindow. This can improve rendering performance by rendering and
    caching tiles instead of rendering the whole canvas every time.

    Memory will be consumed only by those tiles within the current visible
    region.

    By default the tileSize is the same as the canvasSize.

    \sa canvasSize, canvasWindow
*/
QSize QQuickCanvasItem::tileSize() const
{
    Q_D(const QQuickCanvasItem);
    return d->tileSize;
}

void QQuickCanvasItem::setTileSize(const QSize & size)
{
    Q_D(QQuickCanvasItem);
    if (d->tileSize != size) {
        d->hasTileSize = true;
        d->tileSize = size;

        emit tileSizeChanged();

        if (d->context)
            polish();
    }
}

/*!
    \qmlproperty rect QtQuick2::Canvas::canvasWindow
     Holds the current canvas visible window.

     By default the canvasWindow size is the same as the Canvas item size with
     the top-left point as (0, 0).

     If the canvasSize is different to the Canvas item size, the Canvas item
     can display different visible areas by changing the canvas windowSize
     and/or position.

    \sa canvasSize, tileSize
*/
QRectF QQuickCanvasItem::canvasWindow() const
{
    Q_D(const QQuickCanvasItem);
    return d->canvasWindow;
}

void QQuickCanvasItem::setCanvasWindow(const QRectF& rect)
{
    Q_D(QQuickCanvasItem);
    if (d->canvasWindow != rect) {
        d->canvasWindow = rect;

        d->hasCanvasWindow = true;
        emit canvasWindowChanged();

        if (d->context)
            polish();
    }
}

/*!
    \qmlproperty enumeration QtQuick2::Canvas::renderTarget
    Holds the current canvas render target.

    \list
    \li Canvas.Image  - render to an in memory image buffer.
    \li Canvas.FramebufferObject - render to an OpenGL frame buffer
    \endlist

    This hint is supplied along with renderStrategy to the graphics context to
    determine the method of rendering. A renderStrategy, renderTarget or a
    combination may not be supported by a graphics context, in which case the
    context will choose appropriate options and Canvas will signal the change
    to the properties.

    The default render target is \c Canvas.FramebufferObject.
*/
QQuickCanvasItem::RenderTarget QQuickCanvasItem::renderTarget() const
{
    Q_D(const QQuickCanvasItem);
    return d->renderTarget;
}

void QQuickCanvasItem::setRenderTarget(QQuickCanvasItem::RenderTarget target)
{
    Q_D(QQuickCanvasItem);
    if (d->renderTarget != target) {
        if (d->context) {
            qmlInfo(this) << "Canvas:renderTarget not changeble once context is active.";
            return;
        }

        d->renderTarget = target;
        emit renderTargetChanged();
    }
}

/*!
    \qmlproperty enumeration QtQuick2::Canvas::renderStrategy
    Holds the current canvas rendering strategy.

    \list
    \li Canvas.Immediate - context will perform graphics commands immediately in the main UI thread.
    \li Canvas.Threaded - context will defer graphics commands to a private rendering thread.
    \li Canvas.Cooperative - context will defer graphics commands to the applications global render thread.
    \endlist

    This hint is supplied along with renderTarget to the graphics context to
    determine the method of rendering. A renderStrategy, renderTarget or a
    combination may not be supported by a graphics context, in which case the
    context will choose appropriate options and Canvas will signal the change
    to the properties.

    Configuration or runtime tests may cause the QML Scene Graph to render in
    the GUI thread.  Selecting \c Canvas.Cooperative, does not guarantee
    rendering will occur on a thread separate from the GUI thread.

    The default value is \c Canvas.Cooperative.

    \sa renderTarget
*/

QQuickCanvasItem::RenderStrategy QQuickCanvasItem::renderStrategy() const
{
    return d_func()->renderStrategy;
}

void QQuickCanvasItem::setRenderStrategy(QQuickCanvasItem::RenderStrategy strategy)
{
    Q_D(QQuickCanvasItem);
    if (d->renderStrategy != strategy) {
        if (d->context) {
            qmlInfo(this) << "Canvas:renderStrategy not changeable once context is active.";
            return;
        }
        d->renderStrategy = strategy;
        emit renderStrategyChanged();
    }
}

QQuickCanvasContext* QQuickCanvasItem::rawContext() const
{
    return d_func()->context;
}

bool QQuickCanvasItem::isPaintConnected()
{
    IS_SIGNAL_CONNECTED(this, QQuickCanvasItem, paint, (const QRect &));
}

void QQuickCanvasItem::sceneGraphInitialized()
{
    Q_D(QQuickCanvasItem);

    d->available = true;
    connect(this, SIGNAL(visibleChanged()), SLOT(checkAnimationCallbacks()));
    QMetaObject::invokeMethod(this, "availableChanged", Qt::QueuedConnection);

    if (!d->contextType.isNull())
        QMetaObject::invokeMethod(this, "delayedCreate", Qt::QueuedConnection);
    else if (isPaintConnected())
        QMetaObject::invokeMethod(this, "requestPaint", Qt::QueuedConnection);
}

void QQuickCanvasItem::geometryChanged(const QRectF &newGeometry, const QRectF &oldGeometry)
{
    Q_D(QQuickCanvasItem);

    QQuickItem::geometryChanged(newGeometry, oldGeometry);

    QSizeF newSize = newGeometry.size();
    if (!d->hasCanvasSize && d->canvasSize != newSize) {
        d->canvasSize = newSize;
        emit canvasSizeChanged();
    }

    if (!d->hasTileSize && d->tileSize != newSize) {
        d->tileSize = newSize.toSize();
        emit tileSizeChanged();
    }

    const QRectF rect = QRectF(QPointF(0, 0), newSize);

    if (!d->hasCanvasWindow && d->canvasWindow != rect) {
        d->canvasWindow = rect;
        emit canvasWindowChanged();
    }

    if (d->available)
        requestPaint();
}

void QQuickCanvasItem::releaseResources()
{
    Q_D(QQuickCanvasItem);

    if (d->context) {
        delete d->context;
        d->context = 0;
    }
}

void QQuickCanvasItem::componentComplete()
{
    QQuickItem::componentComplete();

    Q_D(QQuickCanvasItem);
    d->baseUrl = qmlEngine(this)->contextForObject(this)->baseUrl();
}

void QQuickCanvasItem::itemChange(QQuickItem::ItemChange change, const QQuickItem::ItemChangeData &value)
{
    QQuickItem::itemChange(change, value);
    if (change != QQuickItem::ItemSceneChange)
        return;

    Q_D(QQuickCanvasItem);
    if (d->available)
        return;

    if (value.window== 0)
        return;

    d->window = value.window;
    if (d->window->openglContext() != 0) // available context == initialized
        sceneGraphInitialized();
    else
        connect(d->window, SIGNAL(sceneGraphInitialized()), SLOT(sceneGraphInitialized()));
}

void QQuickCanvasItem::updatePolish()
{
    QQuickItem::updatePolish();

    Q_D(QQuickCanvasItem);

    if (d->context && d->renderStrategy != QQuickCanvasItem::Cooperative)
        d->context->prepare(d->canvasSize.toSize(), d->tileSize, d->canvasWindow.toRect(), d->dirtyRect.toRect(), d->smooth, d->antialiasing);

    if (d->animationCallbacks.size() > 0 && isVisible()) {
        QMap<int, v8::Persistent<v8::Function> > animationCallbacks = d->animationCallbacks;
        d->animationCallbacks.clear();

        foreach (int key, animationCallbacks.keys()) {
            v8::HandleScope handle_scope;
            v8::Handle<v8::Object> self = QQmlEnginePrivate::getV8Engine(qmlEngine(this))->newQObject(this).As<v8::Object>();
            v8::Handle<v8::Value> args[] = { v8::Uint32::New(QDateTime::currentDateTimeUtc().toTime_t()) };
            v8::Persistent<v8::Function> f = animationCallbacks.value(key);
            f->Call(self, 1, args);
            f.Dispose();
        }
    }
    else {
        if (d->dirtyRect.isValid()) {
            if (d->hasTileSize && d->hasCanvasWindow)
                emit paint(tiledRect(d->canvasWindow.intersected(d->dirtyRect.toAlignedRect()), d->tileSize));
            else
                emit paint(d->dirtyRect.toRect());
            d->dirtyRect = QRectF();
        }
    }

    if (d->context) {
        if (d->renderStrategy == QQuickCanvasItem::Cooperative)
            update();
        else
            d->context->flush();
    }
}

QSGNode *QQuickCanvasItem::updatePaintNode(QSGNode *oldNode, UpdatePaintNodeData *)
{
    Q_D(QQuickCanvasItem);

    if (!d->context) {
        delete oldNode;
        return 0;
    }

    QSGSimpleTextureNode *node = static_cast<QSGSimpleTextureNode*>(oldNode);
    if (!node)
        node = new QSGSimpleTextureNode;

    if (d->smooth)
        node->setFiltering(QSGTexture::Linear);
    else
        node->setFiltering(QSGTexture::Nearest);

    if (d->renderStrategy == QQuickCanvasItem::Cooperative) {
        d->context->prepare(d->canvasSize.toSize(), d->tileSize, d->canvasWindow.toRect(), d->dirtyRect.toRect(), d->smooth, d->antialiasing);
        d->context->flush();
    }

    node->setTexture(d->context->texture());
    node->markDirty(QSGNode::DirtyMaterial);
    node->setRect(QRectF(QPoint(0, 0), d->canvasWindow.size()));
    return node;
}

/*!
    \qmlmethod object QtQuick2::Canvas::getContext(string contextId, any... args)

    Returns a drawing context or null if no context available.
{'fraction_non_alphanumeric': 0.09987086657750312, 'fraction_numerical': 0.0053036941382650004, 'mean_word_length': 3.522577953905517, 'pattern_counts': {'":': 0, '<': 57, '<?xml version=': 0, '>': 272, 'https://': 0, 'lorem ipsum': 0, 'www.': 6, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
{'dir': 'git-commits-cleaned', 'id': '4546937', 'n_tokens_mistral': 12684, 'n_tokens_neox': 12321, 'n_words': 3816}