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Diffstat (limited to 'src/gui/image/qpixmapfilter.cpp')
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diff --git a/src/gui/image/qpixmapfilter.cpp b/src/gui/image/qpixmapfilter.cpp new file mode 100644 index 0000000000..8631c8c2a2 --- /dev/null +++ b/src/gui/image/qpixmapfilter.cpp @@ -0,0 +1,849 @@ +/**************************************************************************** +** +** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). +** Contact: Qt Software Information (qt-info@nokia.com) +** +** This file is part of the QtGui 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 either Technology Preview License Agreement or the +** Beta Release License Agreement. +** +** 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 1.0, 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. +** +** If you are unsure which license is appropriate for your use, please +** contact the sales department at qt-sales@nokia.com. +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include <qglobal.h> + +#include <QDebug> + +#include "qpainter.h" +#include "qpixmap.h" +#include "qpixmapfilter_p.h" +#include "qvarlengtharray.h" + +#include "private/qapplication_p.h" +#include "private/qgraphicssystem_p.h" +#include "private/qpaintengineex_p.h" +#include "private/qpaintengine_raster_p.h" + +QT_BEGIN_NAMESPACE + +class QPixmapFilterPrivate : public QObjectPrivate +{ + Q_DECLARE_PUBLIC(QPixmapFilter) +public: + QPixmapFilter::FilterType type; +}; + +/*! + \class QPixmapFilter + \since 4.5 + \ingroup multimedia + + \brief The QPixmapFilter class provides the basic functionality for + pixmap filter classes. Pixmap filter can be for example colorize or blur. + + QPixmapFilter is the base class for every pixmap filter. QPixmapFilter is + an abstract class and cannot itself be instantiated. It provides a standard + interface for filter processing. + + \internal +*/ + +/*! + \enum QPixmapFilter::FilterType + + \internal + + This enum describes the types of filter that can be applied to pixmaps. + + \value ConvolutionFilter A filter that is used to calculate the convolution + of the image with a kernel. See + QPixmapConvolutionFilter for more information. + \value ColorizeFilter A filter that is used to change the overall color + of an image. See QPixmapColorizeFilter for more + information. + \value DropShadowFilter A filter that is used to add a drop shadow to an + image. See QPixmapDropShadowFilter for more + information. + + \value UserFilter The first filter type that can be used for + application-specific purposes. +*/ + + +/*! + Constructs a default QPixmapFilter with the given \a type. + + This constructor should be used when subclassing QPixmapFilter to + create custom user filters. + + \internal +*/ +QPixmapFilter::QPixmapFilter(FilterType type, QObject *parent) + : QObject(*new QPixmapFilterPrivate, parent) +{ + d_func()->type = type; +} + + + +/*! + \internal +*/ +QPixmapFilter::QPixmapFilter(QPixmapFilterPrivate&d, QPixmapFilter::FilterType type, QObject *parent) + : QObject(d, parent) +{ + d_func()->type = type; +} + + +/*! + Destroys the pixmap filter. + + \internal +*/ +QPixmapFilter::~QPixmapFilter() +{ +} + +/*! + Returns the type of the filter. All standard pixmap filter classes + are associated with a unique value. + + \internal +*/ +QPixmapFilter::FilterType QPixmapFilter::type() const +{ + Q_D(const QPixmapFilter); + return d->type; +} + +/*! + Returns the bounding rectangle that is affected by the pixmap + filter if the filter is applied to the specified \a rect. + + \internal +*/ +QRectF QPixmapFilter::boundingRectFor(const QRectF &rect) const +{ + return rect; +} + +/*! + \fn void QPixmapFilter::draw(QPainter *painter, const QPointF &p, const QPixmap &src, const QRectF& srcRect) const + + Uses \a painter to draw filtered result of \a src at the point + specified by \a p. If \a srcRect is specified the it will + be used as a source rectangle to only draw a part of the source. + + draw() will affect the area which boundingRectFor() returns. + + \internal +*/ + +/*! + \class QPixmapConvolutionFilter + \since 4.5 + \ingroup multimedia + + \brief The QPixmapConvolutionFilter class provides convolution + filtering for pixmaps. + + QPixmapConvolutionFilter implements a convolution pixmap filter, + which is applied when \l{QPixmapFilter::}{draw()} is called. A + convolution filter lets you distort an image by setting the values + of a matrix of qreal values called its + \l{setConvolutionKernel()}{kernel}. The matrix's values are + usually between -1.0 and 1.0. + + \omit + In convolution filtering, the pixel value is calculated from the + neighboring pixels based on the weighting convolution kernel. + This needs explaining to be useful. + \endomit + + Example: + \snippet doc/src/snippets/code/src_gui_image_qpixmapfilter.cpp 1 + + \sa {Pixmap Filters Example}, QPixmapColorizeFilter, QPixmapDropShadowFilter + + + \internal +*/ + +class QPixmapConvolutionFilterPrivate : public QPixmapFilterPrivate +{ +public: + QPixmapConvolutionFilterPrivate(): convolutionKernel(0), kernelWidth(0), kernelHeight(0), convoluteAlpha(false) {} + ~QPixmapConvolutionFilterPrivate() { + delete[] convolutionKernel; + } + + qreal *convolutionKernel; + int kernelWidth; + int kernelHeight; + bool convoluteAlpha; +}; + + +/*! + Constructs a pixmap convolution filter. + + By default there is no convolution kernel. + + \internal +*/ +QPixmapConvolutionFilter::QPixmapConvolutionFilter(QObject *parent) + : QPixmapFilter(*new QPixmapConvolutionFilterPrivate, ConvolutionFilter, parent) +{ + Q_D(QPixmapConvolutionFilter); + d->convoluteAlpha = true; +} + +/*! + Destructor of pixmap convolution filter. + + \internal +*/ +QPixmapConvolutionFilter::~QPixmapConvolutionFilter() +{ +} + +/*! + Sets convolution kernel with the given number of \a rows and \a columns. + Values from \a kernel are copied to internal data structure. + + To preserve the intensity of the pixmap, the sum of all the + values in the convolution kernel should add up to 1.0. A sum + greater than 1.0 produces a lighter result and a sum less than 1.0 + produces a darker and transparent result. + + \internal +*/ +void QPixmapConvolutionFilter::setConvolutionKernel(const qreal *kernel, int rows, int columns) +{ + Q_D(QPixmapConvolutionFilter); + delete [] d->convolutionKernel; + d->convolutionKernel = new qreal[rows * columns]; + memcpy(d->convolutionKernel, kernel, sizeof(qreal) * rows * columns); + d->kernelWidth = columns; + d->kernelHeight = rows; +} + +/*! + Gets the convolution kernel data. + + \internal +*/ +const qreal *QPixmapConvolutionFilter::convolutionKernel() const +{ + Q_D(const QPixmapConvolutionFilter); + return d->convolutionKernel; +} + +/*! + Gets the number of rows in the convolution kernel. + + \internal +*/ +int QPixmapConvolutionFilter::rows() const +{ + Q_D(const QPixmapConvolutionFilter); + return d->kernelHeight; +} + +/*! + Gets the number of columns in the convolution kernel. + + \internal +*/ +int QPixmapConvolutionFilter::columns() const +{ + Q_D(const QPixmapConvolutionFilter); + return d->kernelWidth; +} + + +/*! + \reimp + + \internal +*/ +QRectF QPixmapConvolutionFilter::boundingRectFor(const QRectF &rect) const +{ + Q_D(const QPixmapConvolutionFilter); + return rect.adjusted(-d->kernelWidth / 2, -d->kernelHeight / 2, (d->kernelWidth - 1) / 2, (d->kernelHeight - 1) / 2); +} + +// Convolutes the image +static void convolute( + QImage *destImage, + const QPointF &pos, + const QImage &srcImage, + const QRectF &srcRect, + QPainter::CompositionMode mode, + qreal *kernel, + int kernelWidth, + int kernelHeight ) +{ + const QImage processImage = (srcImage.format() != QImage::Format_ARGB32_Premultiplied ) ? srcImage.convertToFormat(QImage::Format_ARGB32_Premultiplied) : srcImage; + // TODO: support also other formats directly without copying + + int *fixedKernel = new int[kernelWidth*kernelHeight]; + for(int i = 0; i < kernelWidth*kernelHeight; i++) + { + fixedKernel[i] = (int)(65536 * kernel[i]); + } + QRectF trect = srcRect.isNull() ? processImage.rect() : srcRect; + trect.moveTo(pos); + QRectF bounded = trect.adjusted(-kernelWidth / 2, -kernelHeight / 2, (kernelWidth - 1) / 2, (kernelHeight - 1) / 2); + QRect rect = bounded.toAlignedRect(); + QRect targetRect = rect.intersected(destImage->rect()); + + QRectF srect = srcRect.isNull() ? processImage.rect() : srcRect; + QRectF sbounded = srect.adjusted(-kernelWidth / 2, -kernelHeight / 2, (kernelWidth - 1) / 2, (kernelHeight - 1) / 2); + QPoint srcStartPoint = sbounded.toAlignedRect().topLeft()+(targetRect.topLeft()-rect.topLeft()); + + const uint *sourceStart = (uint*)processImage.scanLine(0); + uint *outputStart = (uint*)destImage->scanLine(0); + + int yk = srcStartPoint.y(); + for (int y = targetRect.top(); y <= targetRect.bottom(); y++) { + uint* output = outputStart + (destImage->bytesPerLine()/sizeof(uint))*y+targetRect.left(); + int xk = srcStartPoint.x(); + for(int x = targetRect.left(); x <= targetRect.right(); x++) { + int r = 0; + int g = 0; + int b = 0; + int a = 0; + + // some out of bounds pre-checking to avoid inner-loop ifs + int kernely = -kernelHeight/2; + int starty = 0; + int endy = kernelHeight; + if(yk+kernely+endy >= srcImage.height()) + endy = kernelHeight-((yk+kernely+endy)-srcImage.height())-1; + if(yk+kernely < 0) + starty = -(yk+kernely); + + int kernelx = -kernelWidth/2; + int startx = 0; + int endx = kernelWidth; + if(xk+kernelx+endx >= srcImage.width()) + endx = kernelWidth-((xk+kernelx+endx)-srcImage.width())-1; + if(xk+kernelx < 0) + startx = -(xk+kernelx); + + for (int ys = starty; ys < endy; ys ++) { + const uint *pix = sourceStart + (processImage.bytesPerLine()/sizeof(uint))*(yk+kernely+ys) + ((xk+kernelx+startx)); + const uint *endPix = pix+endx-startx; + int kernelPos = ys*kernelWidth+startx; + while (pix < endPix) { + int factor = fixedKernel[kernelPos++]; + a += (((*pix) & 0xff000000)>>24) * factor; + r += (((*pix) & 0x00ff0000)>>16) * factor; + g += (((*pix) & 0x0000ff00)>>8 ) * factor; + b += (((*pix) & 0x000000ff) ) * factor; + pix++; + } + } + + r = qBound((int)0, r >> 16, (int)255); + g = qBound((int)0, g >> 16, (int)255); + b = qBound((int)0, b >> 16, (int)255); + a = qBound((int)0, a >> 16, (int)255); + // composition mode checking could be moved outside of loop + if(mode == QPainter::CompositionMode_Source) { + uint color = (a<<24)+(r<<16)+(g<<8)+b; + *output++ = color; + } else { + uint current = *output; + uchar ca = (current&0xff000000)>>24; + uchar cr = (current&0x00ff0000)>>16; + uchar cg = (current&0x0000ff00)>>8; + uchar cb = (current&0x000000ff); + uint color = + (((ca*(255-a) >> 8)+a) << 24)+ + (((cr*(255-a) >> 8)+r) << 16)+ + (((cg*(255-a) >> 8)+g) << 8)+ + (((cb*(255-a) >> 8)+b)); + *output++ = color;; + } + xk++; + } + yk++; + } +} + +/*! + \reimp + + \internal +*/ +void QPixmapConvolutionFilter::draw(QPainter *painter, const QPointF &p, const QPixmap &src, const QRectF& srcRect) const +{ + Q_D(const QPixmapConvolutionFilter); + if (!painter->isActive()) + return; + + if(d->kernelWidth<=0 || d->kernelHeight <= 0) + return; + + QPixmapFilter *filter = painter->paintEngine() && painter->paintEngine()->isExtended() ? + static_cast<QPaintEngineEx *>(painter->paintEngine())->createPixmapFilter(type()) : 0; + QPixmapConvolutionFilter *convolutionFilter = static_cast<QPixmapConvolutionFilter*>(filter); + if (convolutionFilter) { + convolutionFilter->setConvolutionKernel(d->convolutionKernel, d->kernelWidth, d->kernelHeight); + convolutionFilter->d_func()->convoluteAlpha = d->convoluteAlpha; + convolutionFilter->draw(painter, p, src, srcRect); + delete convolutionFilter; + return; + } + + // falling back to raster implementation + + QImage *target = 0; + if (painter->paintEngine()->paintDevice()->devType() == QInternal::Image) { + target = static_cast<QImage *>(painter->paintEngine()->paintDevice()); + + QTransform mat = painter->combinedTransform(); + + if (mat.type() > QTransform::TxTranslate) { + // Disabled because of transformation... + target = 0; + } else { + QRasterPaintEngine *pe = static_cast<QRasterPaintEngine *>(painter->paintEngine()); + if (pe->clipType() == QRasterPaintEngine::ComplexClip) + // disabled because of complex clipping... + target = 0; + else { + QRectF clip = pe->clipBoundingRect(); + QRectF rect = boundingRectFor(srcRect.isEmpty() ? src.rect() : srcRect); + QTransform x = painter->deviceTransform(); + if (!clip.contains(rect.translated(x.dx() + p.x(), x.dy() + p.y()))) { + target = 0; + } + + } + } + } + + if (target) { + QTransform x = painter->deviceTransform(); + QPointF offset(x.dx(), x.dy()); + + convolute(target, p+offset, src.toImage(), srcRect, QPainter::CompositionMode_SourceOver, d->convolutionKernel, d->kernelWidth, d->kernelHeight); + } else { + QRect srect = srcRect.isNull() ? src.rect() : srcRect.toRect(); + QRect rect = boundingRectFor(srect).toRect(); + QImage result = QImage(rect.size(), QImage::Format_ARGB32_Premultiplied); + QPoint offset = srect.topLeft() - rect.topLeft(); + convolute(&result, + offset, + src.toImage(), + srect, + QPainter::CompositionMode_Source, + d->convolutionKernel, + d->kernelWidth, + d->kernelHeight); + painter->drawImage(p - offset, result); + } +} + +// grayscales the image to dest (could be same). If rect isn't defined +// destination image size is used to determine the dimension of grayscaling +// process. +static void grayscale(const QImage &image, QImage &dest, const QRect& rect = QRect()) +{ + QRect destRect = rect; + QRect srcRect = rect; + if (rect.isNull()) { + srcRect = dest.rect(); + destRect = dest.rect(); + } + if (image != dest) { + destRect.moveTo(QPoint(0, 0)); + } + + unsigned int *data = (unsigned int *)image.bits(); + unsigned int *outData = (unsigned int *)dest.bits(); + + if (dest.size() == image.size() && image.rect() == srcRect) { + // a bit faster loop for grayscaling everything + int pixels = dest.width() * dest.height(); + for (int i = 0; i < pixels; ++i) { + int val = qGray(data[i]); + outData[i] = qRgba(val, val, val, qAlpha(data[i])); + } + } else { + int yd = destRect.top(); + for (int y = srcRect.top(); y <= srcRect.bottom() && y < image.height(); y++) { + data = (unsigned int*)image.scanLine(y); + outData = (unsigned int*)dest.scanLine(yd++); + int xd = destRect.left(); + for (int x = srcRect.left(); x <= srcRect.right() && x < image.width(); x++) { + int val = qGray(data[x]); + outData[xd++] = qRgba(val, val, val, qAlpha(data[x])); + } + } + } +} + +/*! + \class QPixmapColorizeFilter + \since 4.5 + \ingroup multimedia + + \brief The QPixmapColorizeFilter class provides colorizing + filtering for pixmaps. + + A colorize filter gives the pixmap a tint of its color(). The + filter first grayscales the pixmap and then converts those to + colorized values using QPainter::CompositionMode_Screen with the + chosen color. The alpha-channel is not changed. + + Example: + \snippet doc/src/snippets/code/src_gui_image_qpixmapfilter.cpp 0 + + \sa QPainter::CompositionMode + + \internal +*/ +class QPixmapColorizeFilterPrivate : public QPixmapFilterPrivate +{ + Q_DECLARE_PUBLIC(QPixmapColorizeFilter) +public: + QColor color; +}; + +/*! + Constructs an pixmap colorize filter. + + Default color value for colorizing is QColor(0, 0, 192). + + \internal +*/ +QPixmapColorizeFilter::QPixmapColorizeFilter(QObject *parent) + : QPixmapFilter(*new QPixmapColorizeFilterPrivate, ColorizeFilter, parent) +{ + d_func()->color = QColor(0, 0, 192); +} + +/*! + Gets the color of the colorize filter. + + \internal +*/ +QColor QPixmapColorizeFilter::color() const +{ + Q_D(const QPixmapColorizeFilter); + return d->color; +} + +/*! + Sets the color of the colorize filter to the \a color specified. + + \internal +*/ +void QPixmapColorizeFilter::setColor(const QColor &color) +{ + Q_D(QPixmapColorizeFilter); + d->color = color; +} + +/*! + \reimp + + \internal +*/ +void QPixmapColorizeFilter::draw(QPainter *painter, const QPointF &dest, const QPixmap &src, const QRectF &srcRect) const +{ + Q_D(const QPixmapColorizeFilter); + QPixmapFilter *filter = painter->paintEngine() && painter->paintEngine()->isExtended() ? + static_cast<QPaintEngineEx *>(painter->paintEngine())->createPixmapFilter(type()) : 0; + QPixmapColorizeFilter *colorizeFilter = static_cast<QPixmapColorizeFilter*>(filter); + if (colorizeFilter) { + colorizeFilter->setColor(d->color); + colorizeFilter->draw(painter, dest, src, srcRect); + delete colorizeFilter; + return; + } + + // falling back to raster implementation + + QImage srcImage; + QImage destImage; + + if (srcRect.isNull()) { + srcImage = src.toImage(); + srcImage = srcImage.convertToFormat(srcImage.hasAlphaChannel() ? QImage::Format_ARGB32_Premultiplied : QImage::Format_RGB32); + destImage = QImage(srcImage.size(), srcImage.format()); + } else { + QRect rect = srcRect.toAlignedRect().intersected(src.rect()); + + srcImage = src.copy(rect).toImage(); + srcImage = srcImage.convertToFormat(srcImage.hasAlphaChannel() ? QImage::Format_ARGB32_Premultiplied : QImage::Format_RGB32); + destImage = QImage(rect.size(), srcImage.format()); + } + + // do colorizing + QPainter destPainter(&destImage); + grayscale(srcImage, destImage, srcImage.rect()); + destPainter.setCompositionMode(QPainter::CompositionMode_Screen); + destPainter.fillRect(srcImage.rect(), d->color); + destPainter.end(); + + if (srcImage.hasAlphaChannel()) + destImage.setAlphaChannel(srcImage.alphaChannel()); + + painter->drawImage(dest, destImage); +} + +class QPixmapDropShadowFilterPrivate : public QPixmapFilterPrivate +{ +public: + QPixmapDropShadowFilterPrivate() + : offset(8, 8), + radius(1), + color(63, 63, 63, 255) { + } + + QPointF offset; + qreal radius; + QColor color; + + QPixmapConvolutionFilter *convolution; +}; + +/*! + \class QPixmapDropShadowFilter + \since 4.5 + \ingroup multimedia + + \brief The QPixmapDropShadowFilter class is a convenience class + for drawing pixmaps with drop shadows. + + The drop shadow is produced by taking a copy of the source pixmap + and applying a color to the copy using a + QPainter::CompositionMode_DestinationIn operation. This produces a + homogeneously-colored pixmap which is then drawn using a + QPixmapConvolutionFilter at an offset. The original pixmap is + drawn on top. + + The QPixmapDropShadowFilter class provides some customization + options to specify how the drop shadow should appear. The color of + the drop shadow can be modified using the setColor() function, the + drop shadow offset can be modified using the setOffset() function, + and the blur radius of the drop shadow can be changed through the + setBlurRadius() function. + + By default, the drop shadow is a dark gray shadow, blurred with a + radius of 1 at an offset of 8 pixels towards the lower right. + + Example: + \snippet doc/src/snippets/code/src_gui_image_qpixmapfilter.cpp 2 + + \sa QPixmapColorizeFilter, QPixmapConvolutionFilter + + \internal + */ + +/*! + Constructs drop shadow filter. + + \internal +*/ +QPixmapDropShadowFilter::QPixmapDropShadowFilter(QObject *parent) + : QPixmapFilter(*new QPixmapDropShadowFilterPrivate, DropShadowFilter, parent) +{ + Q_D(QPixmapDropShadowFilter); + d->convolution = new QPixmapConvolutionFilter; + + setBlurRadius(1); +} + +/*! + Destroys drop shadow filter. + + \internal +*/ +QPixmapDropShadowFilter::~QPixmapDropShadowFilter() +{ + Q_D(QPixmapDropShadowFilter); + delete d->convolution; +} + +/*! + Returns the radius in pixels of the blur on the drop shadow. + + A smaller radius results in a sharper shadow. + + \sa color(), offset() + + \internal +*/ +qreal QPixmapDropShadowFilter::blurRadius() const +{ + Q_D(const QPixmapDropShadowFilter); + return d->radius; +} + +/*! + Sets the radius in pixels of the blur on the drop shadow to the \a radius specified. + + Using a smaller radius results in a sharper shadow. + + \sa setColor(), setOffset() + + \internal +*/ +void QPixmapDropShadowFilter::setBlurRadius(qreal radius) +{ + Q_D(QPixmapDropShadowFilter); + + d->radius = radius; + + int dim = 2 * qRound(radius) + 1; + QVarLengthArray<qreal> arr(dim * dim); + qreal f = 1 / qreal(dim * dim); + for (int i = 0; i < dim * dim; ++i) + arr[i] = f; + d->convolution->setConvolutionKernel(arr.data(), dim, dim); +} + +/*! + Returns the color of the drop shadow. + + \sa blurRadius(), offset() + + \internal +*/ +QColor QPixmapDropShadowFilter::color() const +{ + Q_D(const QPixmapDropShadowFilter); + return d->color; +} + +/*! + Sets the color of the drop shadow to the \a color specified. + + \sa setBlurRadius(), setOffset() + + \internal +*/ +void QPixmapDropShadowFilter::setColor(const QColor &color) +{ + Q_D(QPixmapDropShadowFilter); + d->color = color; +} + +/*! + Returns the shadow offset in pixels. + + \sa blurRadius(), color() + + \internal +*/ +QPointF QPixmapDropShadowFilter::offset() const +{ + Q_D(const QPixmapDropShadowFilter); + return d->offset; +} + +/*! + Sets the shadow offset in pixels to the \a offset specified. + + \sa setBlurRadius(), setColor() + + \internal +*/ +void QPixmapDropShadowFilter::setOffset(const QPointF &offset) +{ + Q_D(QPixmapDropShadowFilter); + d->offset = offset; +} + +/*! + \fn void QPixmapDropShadowFilter::setOffset(qreal dx, qreal dy) + \overload + + Sets the shadow offset in pixels to be the displacement specified by the + horizontal \a dx and vertical \a dy coordinates. + + \sa setBlurRadius(), setColor() + + \internal +*/ + +/*! + \reimp + + \internal + */ +QRectF QPixmapDropShadowFilter::boundingRectFor(const QRectF &rect) const +{ + Q_D(const QPixmapDropShadowFilter); + + qreal x1 = qMin(rect.left(), rect.left() + d->offset.x() - d->radius); + qreal y1 = qMin(rect.top(), rect.top() + d->offset.y() - d->radius); + qreal x2 = qMax(rect.right(), rect.right() + d->offset.x() + d->radius); + qreal y2 = qMax(rect.bottom(), rect.bottom() + d->offset.y() + d->radius); + + return QRectF(x1, y1, x2 - x1, y2 - y1); +} + +/*! + \reimp + + \internal + */ +void QPixmapDropShadowFilter::draw(QPainter *p, + const QPointF &pos, + const QPixmap &px, + const QRectF &src) const +{ + Q_D(const QPixmapDropShadowFilter); + + QPixmap tmp = src.isNull() ? px : px.copy(src.toRect()); + QPainter tmpPainter(&tmp); + + // blacken the image... + tmpPainter.setCompositionMode(QPainter::CompositionMode_SourceIn); + tmpPainter.fillRect(0, 0, tmp.width(), tmp.height(), d->color); + tmpPainter.end(); + + // draw the blurred drop shadow... + d->convolution->draw(p, pos + d->offset, tmp); + + // Draw the actual pixmap... + p->drawPixmap(pos, px, src); +} +QT_END_NAMESPACE |