diff options
Diffstat (limited to 'src/declarative/graphicsitems/qdeclarativepainteditem.cpp')
| -rw-r--r-- | src/declarative/graphicsitems/qdeclarativepainteditem.cpp | 466 |
1 files changed, 466 insertions, 0 deletions
diff --git a/src/declarative/graphicsitems/qdeclarativepainteditem.cpp b/src/declarative/graphicsitems/qdeclarativepainteditem.cpp new file mode 100644 index 0000000..ab6007a --- /dev/null +++ b/src/declarative/graphicsitems/qdeclarativepainteditem.cpp @@ -0,0 +1,466 @@ +/**************************************************************************** +** +** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies). +** All rights reserved. +** Contact: Nokia Corporation (qt-info@nokia.com) +** +** This file is part of the QtDeclarative module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** No Commercial Usage +** This file contains pre-release code and may not be distributed. +** You may use this file in accordance with the terms and conditions +** contained in the Technology Preview License Agreement accompanying +** this package. +** +** 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, Nokia gives you certain additional +** rights. These rights are described in the Nokia Qt LGPL Exception +** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. +** +** If you have questions regarding the use of this file, please contact +** Nokia at qt-info@nokia.com. +** +** +** +** +** +** +** +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "qdeclarativepainteditem_p.h" +#include "qdeclarativepainteditem_p_p.h" + +#include <QDebug> +#include <QPen> +#include <QFile> +#include <QEvent> +#include <QApplication> +#include <QGraphicsSceneMouseEvent> +#include <QPainter> +#include <QPaintEngine> +#include <qmath.h> + +QT_BEGIN_NAMESPACE + +/*! + \class QDeclarativePaintedItem + \brief The QDeclarativePaintedItem class is an abstract base class for QDeclarativeView items that want cached painting. + \internal + + This is a convenience class for implementing items that paint their contents + using a QPainter. The contents of the item are cached behind the scenes. + The dirtyCache() function should be called if the contents change to + ensure the cache is refreshed the next time painting occurs. + + To subclass QDeclarativePaintedItem, you must reimplement drawContents() to draw + the contents of the item. +*/ + +/*! + \fn void QDeclarativePaintedItem::drawContents(QPainter *painter, const QRect &rect) + + This function is called when the cache needs to be refreshed. When + sub-classing QDeclarativePaintedItem this function should be implemented so as to + paint the contents of the item using the given \a painter for the + area of the contents specified by \a rect. +*/ + +/*! + \property QDeclarativePaintedItem::contentsSize + \brief The size of the contents + + The contents size is the size of the item in regards to how it is painted + using the drawContents() function. This is distinct from the size of the + item in regards to height() and width(). +*/ + +// XXX bug in WebKit - can call repaintRequested and other cache-changing functions from within render! +static int inpaint=0; +static int inpaint_clearcache=0; + +/*! + Marks areas of the cache that intersect with the given \a rect as dirty and + in need of being refreshed. + + \sa clearCache() +*/ +void QDeclarativePaintedItem::dirtyCache(const QRect& rect) +{ + Q_D(QDeclarativePaintedItem); + QRect srect(qCeil(rect.x()*d->contentsScale), + qCeil(rect.y()*d->contentsScale), + qCeil(rect.width()*d->contentsScale), + qCeil(rect.height()*d->contentsScale)); + for (int i=0; i < d->imagecache.count(); ) { + QDeclarativePaintedItemPrivate::ImageCacheItem *c = d->imagecache[i]; + QRect isect = (c->area & srect) | c->dirty; + if (isect == c->area && !inpaint) { + delete d->imagecache.takeAt(i); + } else { + c->dirty = isect; + ++i; + } + } +} + +/*! + Marks the entirety of the contents cache as dirty. + + \sa dirtyCache() +*/ +void QDeclarativePaintedItem::clearCache() +{ + if (inpaint) { + inpaint_clearcache=1; + return; + } + Q_D(QDeclarativePaintedItem); + qDeleteAll(d->imagecache); + d->imagecache.clear(); +} + +/*! + Returns the size of the contents. + + \sa setContentsSize() +*/ +QSize QDeclarativePaintedItem::contentsSize() const +{ + Q_D(const QDeclarativePaintedItem); + return d->contentsSize; +} + +/*! + Sets the size of the contents to the given \a size. + + \sa contentsSize() +*/ +void QDeclarativePaintedItem::setContentsSize(const QSize &size) +{ + Q_D(QDeclarativePaintedItem); + if (d->contentsSize == size) return; + d->contentsSize = size; + setImplicitWidth(size.width()*d->contentsScale); + setImplicitHeight(size.height()*d->contentsScale); + clearCache(); + update(); + emit contentsSizeChanged(); +} + +qreal QDeclarativePaintedItem::contentsScale() const +{ + Q_D(const QDeclarativePaintedItem); + return d->contentsScale; +} + +void QDeclarativePaintedItem::setContentsScale(qreal scale) +{ + Q_D(QDeclarativePaintedItem); + if (d->contentsScale == scale) return; + d->contentsScale = scale; + setImplicitWidth(d->contentsSize.width()*scale); + setImplicitHeight(d->contentsSize.height()*scale); + clearCache(); + update(); + emit contentsScaleChanged(); +} + + +/*! + Constructs a new QDeclarativePaintedItem with the given \a parent. +*/ +QDeclarativePaintedItem::QDeclarativePaintedItem(QDeclarativeItem *parent) + : QDeclarativeItem(*(new QDeclarativePaintedItemPrivate), parent) +{ + init(); +} + +/*! + \internal + Constructs a new QDeclarativePaintedItem with the given \a parent and + initialized private data member \a dd. +*/ +QDeclarativePaintedItem::QDeclarativePaintedItem(QDeclarativePaintedItemPrivate &dd, QDeclarativeItem *parent) + : QDeclarativeItem(dd, parent) +{ + init(); +} + +/*! + Destroys the image item. +*/ +QDeclarativePaintedItem::~QDeclarativePaintedItem() +{ + clearCache(); +} + +/*! + \internal +*/ +void QDeclarativePaintedItem::init() +{ + connect(this,SIGNAL(widthChanged()),this,SLOT(clearCache())); + connect(this,SIGNAL(heightChanged()),this,SLOT(clearCache())); + connect(this,SIGNAL(visibleChanged()),this,SLOT(clearCache())); +} + +void QDeclarativePaintedItem::setCacheFrozen(bool frozen) +{ + Q_D(QDeclarativePaintedItem); + if (d->cachefrozen == frozen) + return; + d->cachefrozen = frozen; + // XXX clear cache? +} + +/*! + \reimp +*/ +void QDeclarativePaintedItem::paint(QPainter *p, const QStyleOptionGraphicsItem *, QWidget *) +{ + Q_D(QDeclarativePaintedItem); + const QRect content(0,0,qCeil(d->contentsSize.width()*d->contentsScale), + qCeil(d->contentsSize.height()*d->contentsScale)); + if (content.width() <= 0 || content.height() <= 0) + return; + + ++inpaint; + + const QTransform &x = p->deviceTransform(); + QTransform xinv = x.inverted(); + QRegion effectiveClip; + QRegion sysClip = p->paintEngine()->systemClip(); + if (xinv.type() <= QTransform::TxScale && sysClip.numRects() < 5) { + // simple transform, region gets no more complicated... + effectiveClip = xinv.map(sysClip); + } else { + // do not make complicated regions... + effectiveClip = xinv.mapRect(sysClip.boundingRect()); + } + + QRegion topaint = p->clipRegion(); + if (topaint.isEmpty()) { + if (effectiveClip.isEmpty()) + topaint = QRect(0,0,p->device()->width(),p->device()->height()); + else + topaint = effectiveClip; + } else if (!effectiveClip.isEmpty()) { + topaint &= effectiveClip; + } + + topaint &= content; + QRegion uncached(content); + p->setRenderHints(QPainter::SmoothPixmapTransform, d->smooth); + + int cachesize=0; + for (int i=0; i<d->imagecache.count(); ++i) { + QRect area = d->imagecache[i]->area; + if (topaint.contains(area)) { + QRectF target(area.x(), area.y(), area.width(), area.height()); + if (!d->cachefrozen) { + if (!d->imagecache[i]->dirty.isNull() && topaint.contains(d->imagecache[i]->dirty)) { + QPainter qp(&d->imagecache[i]->image); + qp.setRenderHints(QPainter::HighQualityAntialiasing | QPainter::TextAntialiasing | QPainter::SmoothPixmapTransform, d->smoothCache); + qp.translate(-area.x(), -area.y()); + qp.scale(d->contentsScale,d->contentsScale); + QRect clip = d->imagecache[i]->dirty; + QRect sclip(qFloor(clip.x()/d->contentsScale), + qFloor(clip.y()/d->contentsScale), + qCeil(clip.width()/d->contentsScale+clip.x()/d->contentsScale-qFloor(clip.x()/d->contentsScale)), + qCeil(clip.height()/d->contentsScale+clip.y()/d->contentsScale-qFloor(clip.y()/d->contentsScale))); + qp.setClipRect(sclip); + if (d->fillColor.isValid()){ + if(d->fillColor.alpha() < 255){ + // ### Might not work outside of raster paintengine + QPainter::CompositionMode prev = qp.compositionMode(); + qp.setCompositionMode(QPainter::CompositionMode_Source); + qp.fillRect(sclip,d->fillColor); + qp.setCompositionMode(prev); + }else{ + qp.fillRect(sclip,d->fillColor); + } + } + drawContents(&qp, sclip); + d->imagecache[i]->dirty = QRect(); + } + } + p->drawPixmap(target.toRect(), d->imagecache[i]->image); + topaint -= area; + d->imagecache[i]->age=0; + } else { + d->imagecache[i]->age++; + } + cachesize += area.width()*area.height(); + uncached -= area; + } + + if (!topaint.isEmpty()) { + if (!d->cachefrozen) { + // Find a sensible larger area, otherwise will paint lots of tiny images. + QRect biggerrect = topaint.boundingRect().adjusted(-64,-64,128,128); + cachesize += biggerrect.width() * biggerrect.height(); + while (d->imagecache.count() && cachesize > d->max_imagecache_size) { + int oldest=-1; + int age=-1; + for (int i=0; i<d->imagecache.count(); ++i) { + int a = d->imagecache[i]->age; + if (a > age) { + oldest = i; + age = a; + } + } + cachesize -= d->imagecache[oldest]->area.width()*d->imagecache[oldest]->area.height(); + uncached += d->imagecache[oldest]->area; + delete d->imagecache.takeAt(oldest); + } + const QRegion bigger = QRegion(biggerrect) & uncached; + const QVector<QRect> rects = bigger.rects(); + for (int i = 0; i < rects.count(); ++i) { + const QRect &r = rects.at(i); + QPixmap img(r.size()); + if (d->fillColor.isValid()) + img.fill(d->fillColor); + { + QPainter qp(&img); + qp.setRenderHints(QPainter::HighQualityAntialiasing | QPainter::TextAntialiasing | QPainter::SmoothPixmapTransform, d->smoothCache); + + qp.translate(-r.x(),-r.y()); + qp.scale(d->contentsScale,d->contentsScale); + QRect sclip(qFloor(r.x()/d->contentsScale), + qFloor(r.y()/d->contentsScale), + qCeil(r.width()/d->contentsScale+r.x()/d->contentsScale-qFloor(r.x()/d->contentsScale)), + qCeil(r.height()/d->contentsScale+r.y()/d->contentsScale-qFloor(r.y()/d->contentsScale))); + drawContents(&qp, sclip); + } + QDeclarativePaintedItemPrivate::ImageCacheItem *newitem = new QDeclarativePaintedItemPrivate::ImageCacheItem; + newitem->area = r; + newitem->image = img; + d->imagecache.append(newitem); + p->drawPixmap(r, newitem->image); + } + } else { + const QVector<QRect> rects = uncached.rects(); + for (int i = 0; i < rects.count(); ++i) + p->fillRect(rects.at(i), Qt::lightGray); + } + } + + if (inpaint_clearcache) { + clearCache(); + inpaint_clearcache = 0; + } + + --inpaint; +} + +/*! + \qmlproperty int PaintedItem::pixelCacheSize + + This property holds the maximum number of pixels of image cache to + allow. The default is 0.1 megapixels. The cache will not be larger + than the (unscaled) size of the WebView. +*/ +/*! + \property QDeclarativePaintedItem::pixelCacheSize + + The maximum number of pixels of image cache to allow. The default + is 0.1 megapixels. The cache will not be larger than the (unscaled) + size of the QDeclarativePaintedItem. +*/ +int QDeclarativePaintedItem::pixelCacheSize() const +{ + Q_D(const QDeclarativePaintedItem); + return d->max_imagecache_size; +} + +void QDeclarativePaintedItem::setPixelCacheSize(int pixels) +{ + Q_D(QDeclarativePaintedItem); + if (pixels < d->max_imagecache_size) { + int cachesize=0; + for (int i=0; i<d->imagecache.count(); ++i) { + QRect area = d->imagecache[i]->area; + cachesize += area.width()*area.height(); + } + while (d->imagecache.count() && cachesize > pixels) { + int oldest=-1; + int age=-1; + for (int i=0; i<d->imagecache.count(); ++i) { + int a = d->imagecache[i]->age; + if (a > age) { + oldest = i; + age = a; + } + } + cachesize -= d->imagecache[oldest]->area.width()*d->imagecache[oldest]->area.height(); + delete d->imagecache.takeAt(oldest); + } + } + d->max_imagecache_size = pixels; +} + + + +/*! + \property QDeclarativePaintedItem::fillColor + + The color to be used to fill the item prior to calling drawContents(). + By default, this is Qt::transparent. + + Performance improvements can be achieved if subclasses call this with either an + invalid color (QColor()), or an appropriate solid color. +*/ +void QDeclarativePaintedItem::setFillColor(const QColor& c) +{ + Q_D(QDeclarativePaintedItem); + if (d->fillColor == c) + return; + d->fillColor = c; + emit fillColorChanged(); + update(); +} + +QColor QDeclarativePaintedItem::fillColor() const +{ + Q_D(const QDeclarativePaintedItem); + return d->fillColor; +} + +/*! + \qmlproperty bool PaintedItem::smoothCache + + Controls whether the cached tiles of which the item is composed are + rendered smoothly when they are generated. + + This is in addition toe Item::smooth, which controls the smooth painting of + the already-painted cached tiles under transformation. +*/ +bool QDeclarativePaintedItem::smoothCache() const +{ + Q_D(const QDeclarativePaintedItem); + return d->smoothCache; +} + +void QDeclarativePaintedItem::setSmoothCache(bool on) +{ + Q_D(QDeclarativePaintedItem); + if (d->smoothCache != on) { + d->smoothCache = on; + clearCache(); + } +} + + +QT_END_NAMESPACE |