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Diffstat (limited to 'src/widgets/effects/qpixmapfilter.cpp')
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diff --git a/src/widgets/effects/qpixmapfilter.cpp b/src/widgets/effects/qpixmapfilter.cpp new file mode 100644 index 0000000000..9cdedc19a3 --- /dev/null +++ b/src/widgets/effects/qpixmapfilter.cpp @@ -0,0 +1,1381 @@ +/**************************************************************************** +** +** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies). +** All rights reserved. +** Contact: Nokia Corporation (qt-info@nokia.com) +** +** This file is part of the QtGui module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** GNU Lesser General Public License Usage +** 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. +** +** 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. +** +** Other Usage +** Alternatively, this file may be used in accordance with the terms and +** conditions contained in a signed written agreement between you and Nokia. +** +** +** +** +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include <qglobal.h> + +#include <QDebug> + +#include "qpainter.h" +#include "qpixmap.h" +#include "qpixmapfilter_p.h" +#include "qvarlengtharray.h" + +#include "private/qguiapplication_p.h" +#include "private/qpaintengineex_p.h" +#include "private/qpaintengine_raster_p.h" +#include "qmath.h" +#include "private/qmath_p.h" +#include "private/qmemrotate_p.h" +#include "private/qdrawhelper_p.h" + +#ifndef QT_NO_GRAPHICSEFFECT +QT_BEGIN_NAMESPACE + +class QPixmapFilterPrivate : public QObjectPrivate +{ + Q_DECLARE_PUBLIC(QPixmapFilter) +public: + QPixmapFilter::FilterType type; +}; + +/*! + \class QPixmapFilter + \since 4.5 + \ingroup painting + + \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 BlurFilter A filter that is used to blur an image using + a simple blur radius. See QPixmapBlurFilter + 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 painting + + \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; +} + + +/*! + \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++; + } + delete[] fixedKernel; +} + +/*! + \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; + + if (src.isNull()) + return; + + QPixmapFilter *filter = painter->paintEngine() && painter->paintEngine()->isExtended() ? + static_cast<QPaintEngineEx *>(painter->paintEngine())->pixmapFilter(type(), this) : 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); + 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); + } +} + +/*! + \class QPixmapBlurFilter + \since 4.6 + \ingroup multimedia + + \brief The QPixmapBlurFilter class provides blur filtering + for pixmaps. + + QPixmapBlurFilter implements a blur pixmap filter, + which is applied when \l{QPixmapFilter::}{draw()} is called. + + The filter lets you specialize the radius of the blur as well + as hints as to whether to prefer performance or quality. + + By default, the blur effect is produced by applying an exponential + filter generated from the specified blurRadius(). Paint engines + may override this with a custom blur that is faster on the + underlying hardware. + + \sa {Pixmap Filters Example}, QPixmapConvolutionFilter, QPixmapDropShadowFilter + + \internal +*/ + +class QPixmapBlurFilterPrivate : public QPixmapFilterPrivate +{ +public: + QPixmapBlurFilterPrivate() : radius(5), hints(QGraphicsBlurEffect::PerformanceHint) {} + + qreal radius; + QGraphicsBlurEffect::BlurHints hints; +}; + + +/*! + Constructs a pixmap blur filter. + + \internal +*/ +QPixmapBlurFilter::QPixmapBlurFilter(QObject *parent) + : QPixmapFilter(*new QPixmapBlurFilterPrivate, BlurFilter, parent) +{ +} + +/*! + Destructor of pixmap blur filter. + + \internal +*/ +QPixmapBlurFilter::~QPixmapBlurFilter() +{ +} + +/*! + Sets the radius of the blur filter. Higher radius produces increased blurriness. + + \internal +*/ +void QPixmapBlurFilter::setRadius(qreal radius) +{ + Q_D(QPixmapBlurFilter); + d->radius = radius; +} + +/*! + Gets the radius of the blur filter. + + \internal +*/ +qreal QPixmapBlurFilter::radius() const +{ + Q_D(const QPixmapBlurFilter); + return d->radius; +} + +/*! + Setting the blur hints to PerformanceHint causes the implementation + to trade off visual quality to blur the image faster. Setting the + blur hints to QualityHint causes the implementation to improve + visual quality at the expense of speed. + + AnimationHint causes the implementation to optimize for animating + the blur radius, possibly by caching blurred versions of the source + pixmap. + + The implementation is free to ignore this value if it only has a single + blur algorithm. + + \internal +*/ +void QPixmapBlurFilter::setBlurHints(QGraphicsBlurEffect::BlurHints hints) +{ + Q_D(QPixmapBlurFilter); + d->hints = hints; +} + +/*! + Gets the blur hints of the blur filter. + + \internal +*/ +QGraphicsBlurEffect::BlurHints QPixmapBlurFilter::blurHints() const +{ + Q_D(const QPixmapBlurFilter); + return d->hints; +} + +const qreal radiusScale = qreal(2.5); + +/*! + \internal +*/ +QRectF QPixmapBlurFilter::boundingRectFor(const QRectF &rect) const +{ + Q_D(const QPixmapBlurFilter); + const qreal delta = radiusScale * d->radius + 1; + return rect.adjusted(-delta, -delta, delta, delta); +} + +template <int shift> +inline int qt_static_shift(int value) +{ + if (shift == 0) + return value; + else if (shift > 0) + return value << (uint(shift) & 0x1f); + else + return value >> (uint(-shift) & 0x1f); +} + +template<int aprec, int zprec> +inline void qt_blurinner(uchar *bptr, int &zR, int &zG, int &zB, int &zA, int alpha) +{ + QRgb *pixel = (QRgb *)bptr; + +#define Z_MASK (0xff << zprec) + const int A_zprec = qt_static_shift<zprec - 24>(*pixel) & Z_MASK; + const int R_zprec = qt_static_shift<zprec - 16>(*pixel) & Z_MASK; + const int G_zprec = qt_static_shift<zprec - 8>(*pixel) & Z_MASK; + const int B_zprec = qt_static_shift<zprec>(*pixel) & Z_MASK; +#undef Z_MASK + + const int zR_zprec = zR >> aprec; + const int zG_zprec = zG >> aprec; + const int zB_zprec = zB >> aprec; + const int zA_zprec = zA >> aprec; + + zR += alpha * (R_zprec - zR_zprec); + zG += alpha * (G_zprec - zG_zprec); + zB += alpha * (B_zprec - zB_zprec); + zA += alpha * (A_zprec - zA_zprec); + +#define ZA_MASK (0xff << (zprec + aprec)) + *pixel = + qt_static_shift<24 - zprec - aprec>(zA & ZA_MASK) + | qt_static_shift<16 - zprec - aprec>(zR & ZA_MASK) + | qt_static_shift<8 - zprec - aprec>(zG & ZA_MASK) + | qt_static_shift<-zprec - aprec>(zB & ZA_MASK); +#undef ZA_MASK +} + +const int alphaIndex = (QSysInfo::ByteOrder == QSysInfo::BigEndian ? 0 : 3); + +template<int aprec, int zprec> +inline void qt_blurinner_alphaOnly(uchar *bptr, int &z, int alpha) +{ + const int A_zprec = int(*(bptr)) << zprec; + const int z_zprec = z >> aprec; + z += alpha * (A_zprec - z_zprec); + *(bptr) = z >> (zprec + aprec); +} + +template<int aprec, int zprec, bool alphaOnly> +inline void qt_blurrow(QImage & im, int line, int alpha) +{ + uchar *bptr = im.scanLine(line); + + int zR = 0, zG = 0, zB = 0, zA = 0; + + if (alphaOnly && im.format() != QImage::Format_Indexed8) + bptr += alphaIndex; + + const int stride = im.depth() >> 3; + const int im_width = im.width(); + for (int index = 0; index < im_width; ++index) { + if (alphaOnly) + qt_blurinner_alphaOnly<aprec, zprec>(bptr, zA, alpha); + else + qt_blurinner<aprec, zprec>(bptr, zR, zG, zB, zA, alpha); + bptr += stride; + } + + bptr -= stride; + + for (int index = im_width - 2; index >= 0; --index) { + bptr -= stride; + if (alphaOnly) + qt_blurinner_alphaOnly<aprec, zprec>(bptr, zA, alpha); + else + qt_blurinner<aprec, zprec>(bptr, zR, zG, zB, zA, alpha); + } +} + +/* +* expblur(QImage &img, int radius) +* +* Based on exponential blur algorithm by Jani Huhtanen +* +* In-place blur of image 'img' with kernel +* of approximate radius 'radius'. +* +* Blurs with two sided exponential impulse +* response. +* +* aprec = precision of alpha parameter +* in fixed-point format 0.aprec +* +* zprec = precision of state parameters +* zR,zG,zB and zA in fp format 8.zprec +*/ +template <int aprec, int zprec, bool alphaOnly> +void expblur(QImage &img, qreal radius, bool improvedQuality = false, int transposed = 0) +{ + // halve the radius if we're using two passes + if (improvedQuality) + radius *= qreal(0.5); + + Q_ASSERT(img.format() == QImage::Format_ARGB32_Premultiplied + || img.format() == QImage::Format_RGB32 + || img.format() == QImage::Format_Indexed8); + + // choose the alpha such that pixels at radius distance from a fully + // saturated pixel will have an alpha component of no greater than + // the cutOffIntensity + const qreal cutOffIntensity = 2; + int alpha = radius <= qreal(1e-5) + ? ((1 << aprec)-1) + : qRound((1<<aprec)*(1 - qPow(cutOffIntensity * (1 / qreal(255)), 1 / radius))); + + int img_height = img.height(); + for (int row = 0; row < img_height; ++row) { + for (int i = 0; i <= int(improvedQuality); ++i) + qt_blurrow<aprec, zprec, alphaOnly>(img, row, alpha); + } + + QImage temp(img.height(), img.width(), img.format()); + if (transposed >= 0) { + if (img.depth() == 8) { + qt_memrotate270(reinterpret_cast<const quint8*>(img.bits()), + img.width(), img.height(), img.bytesPerLine(), + reinterpret_cast<quint8*>(temp.bits()), + temp.bytesPerLine()); + } else { + qt_memrotate270(reinterpret_cast<const quint32*>(img.bits()), + img.width(), img.height(), img.bytesPerLine(), + reinterpret_cast<quint32*>(temp.bits()), + temp.bytesPerLine()); + } + } else { + if (img.depth() == 8) { + qt_memrotate90(reinterpret_cast<const quint8*>(img.bits()), + img.width(), img.height(), img.bytesPerLine(), + reinterpret_cast<quint8*>(temp.bits()), + temp.bytesPerLine()); + } else { + qt_memrotate90(reinterpret_cast<const quint32*>(img.bits()), + img.width(), img.height(), img.bytesPerLine(), + reinterpret_cast<quint32*>(temp.bits()), + temp.bytesPerLine()); + } + } + + img_height = temp.height(); + for (int row = 0; row < img_height; ++row) { + for (int i = 0; i <= int(improvedQuality); ++i) + qt_blurrow<aprec, zprec, alphaOnly>(temp, row, alpha); + } + + if (transposed == 0) { + if (img.depth() == 8) { + qt_memrotate90(reinterpret_cast<const quint8*>(temp.bits()), + temp.width(), temp.height(), temp.bytesPerLine(), + reinterpret_cast<quint8*>(img.bits()), + img.bytesPerLine()); + } else { + qt_memrotate90(reinterpret_cast<const quint32*>(temp.bits()), + temp.width(), temp.height(), temp.bytesPerLine(), + reinterpret_cast<quint32*>(img.bits()), + img.bytesPerLine()); + } + } else { + img = temp; + } +} +#define AVG(a,b) ( ((((a)^(b)) & 0xfefefefeUL) >> 1) + ((a)&(b)) ) +#define AVG16(a,b) ( ((((a)^(b)) & 0xf7deUL) >> 1) + ((a)&(b)) ) + +Q_WIDGETS_EXPORT QImage qt_halfScaled(const QImage &source) +{ + if (source.width() < 2 || source.height() < 2) + return QImage(); + + QImage srcImage = source; + + if (source.format() == QImage::Format_Indexed8) { + // assumes grayscale + QImage dest(source.width() / 2, source.height() / 2, srcImage.format()); + + const uchar *src = reinterpret_cast<const uchar*>(const_cast<const QImage &>(srcImage).bits()); + int sx = srcImage.bytesPerLine(); + int sx2 = sx << 1; + + uchar *dst = reinterpret_cast<uchar*>(dest.bits()); + int dx = dest.bytesPerLine(); + int ww = dest.width(); + int hh = dest.height(); + + for (int y = hh; y; --y, dst += dx, src += sx2) { + const uchar *p1 = src; + const uchar *p2 = src + sx; + uchar *q = dst; + for (int x = ww; x; --x, ++q, p1 += 2, p2 += 2) + *q = ((int(p1[0]) + int(p1[1]) + int(p2[0]) + int(p2[1])) + 2) >> 2; + } + + return dest; + } else if (source.format() == QImage::Format_ARGB8565_Premultiplied) { + QImage dest(source.width() / 2, source.height() / 2, srcImage.format()); + + const uchar *src = reinterpret_cast<const uchar*>(const_cast<const QImage &>(srcImage).bits()); + int sx = srcImage.bytesPerLine(); + int sx2 = sx << 1; + + uchar *dst = reinterpret_cast<uchar*>(dest.bits()); + int dx = dest.bytesPerLine(); + int ww = dest.width(); + int hh = dest.height(); + + for (int y = hh; y; --y, dst += dx, src += sx2) { + const uchar *p1 = src; + const uchar *p2 = src + sx; + uchar *q = dst; + for (int x = ww; x; --x, q += 3, p1 += 6, p2 += 6) { + // alpha + q[0] = AVG(AVG(p1[0], p1[3]), AVG(p2[0], p2[3])); + // rgb + const quint16 p16_1 = (p1[2] << 8) | p1[1]; + const quint16 p16_2 = (p1[5] << 8) | p1[4]; + const quint16 p16_3 = (p2[2] << 8) | p2[1]; + const quint16 p16_4 = (p2[5] << 8) | p2[4]; + const quint16 result = AVG16(AVG16(p16_1, p16_2), AVG16(p16_3, p16_4)); + q[1] = result & 0xff; + q[2] = result >> 8; + } + } + + return dest; + } else if (source.format() != QImage::Format_ARGB32_Premultiplied + && source.format() != QImage::Format_RGB32) + { + srcImage = source.convertToFormat(QImage::Format_ARGB32_Premultiplied); + } + + QImage dest(source.width() / 2, source.height() / 2, srcImage.format()); + + const quint32 *src = reinterpret_cast<const quint32*>(const_cast<const QImage &>(srcImage).bits()); + int sx = srcImage.bytesPerLine() >> 2; + int sx2 = sx << 1; + + quint32 *dst = reinterpret_cast<quint32*>(dest.bits()); + int dx = dest.bytesPerLine() >> 2; + int ww = dest.width(); + int hh = dest.height(); + + for (int y = hh; y; --y, dst += dx, src += sx2) { + const quint32 *p1 = src; + const quint32 *p2 = src + sx; + quint32 *q = dst; + for (int x = ww; x; --x, q++, p1 += 2, p2 += 2) + *q = AVG(AVG(p1[0], p1[1]), AVG(p2[0], p2[1])); + } + + return dest; +} + +Q_WIDGETS_EXPORT void qt_blurImage(QPainter *p, QImage &blurImage, qreal radius, bool quality, bool alphaOnly, int transposed = 0) +{ + if (blurImage.format() != QImage::Format_ARGB32_Premultiplied + && blurImage.format() != QImage::Format_RGB32) + { + blurImage = blurImage.convertToFormat(QImage::Format_ARGB32_Premultiplied); + } + + qreal scale = 1; + if (radius >= 4 && blurImage.width() >= 2 && blurImage.height() >= 2) { + blurImage = qt_halfScaled(blurImage); + scale = 2; + radius *= qreal(0.5); + } + + if (alphaOnly) + expblur<12, 10, true>(blurImage, radius, quality, transposed); + else + expblur<12, 10, false>(blurImage, radius, quality, transposed); + + if (p) { + p->scale(scale, scale); + p->setRenderHint(QPainter::SmoothPixmapTransform); + p->drawImage(QRect(0, 0, blurImage.width(), blurImage.height()), blurImage); + } +} + +Q_WIDGETS_EXPORT void qt_blurImage(QImage &blurImage, qreal radius, bool quality, int transposed = 0) +{ + if (blurImage.format() == QImage::Format_Indexed8) + expblur<12, 10, true>(blurImage, radius, quality, transposed); + else + expblur<12, 10, false>(blurImage, radius, quality, transposed); +} + +Q_GUI_EXPORT extern bool qt_scaleForTransform(const QTransform &transform, qreal *scale); + +/*! + \internal +*/ +void QPixmapBlurFilter::draw(QPainter *painter, const QPointF &p, const QPixmap &src, const QRectF &rect) const +{ + Q_D(const QPixmapBlurFilter); + if (!painter->isActive()) + return; + + if (src.isNull()) + return; + + QRectF srcRect = rect; + if (srcRect.isNull()) + srcRect = src.rect(); + + if (d->radius <= 1) { + painter->drawPixmap(srcRect.translated(p), src, srcRect); + return; + } + + qreal scaledRadius = radiusScale * d->radius; + qreal scale; + if (qt_scaleForTransform(painter->transform(), &scale)) + scaledRadius /= scale; + + QPixmapFilter *filter = painter->paintEngine() && painter->paintEngine()->isExtended() ? + static_cast<QPaintEngineEx *>(painter->paintEngine())->pixmapFilter(type(), this) : 0; + QPixmapBlurFilter *blurFilter = static_cast<QPixmapBlurFilter*>(filter); + if (blurFilter) { + blurFilter->setRadius(scaledRadius); + blurFilter->setBlurHints(d->hints); + blurFilter->draw(painter, p, src, srcRect); + return; + } + + QImage srcImage; + QImage destImage; + + if (srcRect == src.rect()) { + srcImage = src.toImage(); + } else { + QRect rect = srcRect.toAlignedRect().intersected(src.rect()); + srcImage = src.copy(rect).toImage(); + } + + QTransform transform = painter->worldTransform(); + painter->translate(p); + qt_blurImage(painter, srcImage, scaledRadius, (d->hints & QGraphicsBlurEffect::QualityHint), false); + painter->setWorldTransform(transform); +} + +// 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 painting + + \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; + qreal strength; + quint32 opaque : 1; + quint32 alphaBlend : 1; + quint32 padding : 30; +}; + +/*! + 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) +{ + Q_D(QPixmapColorizeFilter); + d->color = QColor(0, 0, 192); + d->strength = qreal(1); + d->opaque = true; + d->alphaBlend = false; +} + +/*! + 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; +} + +/*! + Gets the strength of the colorize filter, 1.0 means full colorized while + 0.0 equals to no filtering at all. + + \internal +*/ +qreal QPixmapColorizeFilter::strength() const +{ + Q_D(const QPixmapColorizeFilter); + return d->strength; +} + +/*! + Sets the strength of the colorize filter to \a strength. + + \internal +*/ +void QPixmapColorizeFilter::setStrength(qreal strength) +{ + Q_D(QPixmapColorizeFilter); + d->strength = qBound(qreal(0), strength, qreal(1)); + d->opaque = !qFuzzyIsNull(d->strength); + d->alphaBlend = !qFuzzyIsNull(d->strength - 1); +} + +/*! + \internal +*/ +void QPixmapColorizeFilter::draw(QPainter *painter, const QPointF &dest, const QPixmap &src, const QRectF &srcRect) const +{ + Q_D(const QPixmapColorizeFilter); + + if (src.isNull()) + return; + + QPixmapFilter *filter = painter->paintEngine() && painter->paintEngine()->isExtended() ? + static_cast<QPaintEngineEx *>(painter->paintEngine())->pixmapFilter(type(), this) : 0; + QPixmapColorizeFilter *colorizeFilter = static_cast<QPixmapColorizeFilter*>(filter); + if (colorizeFilter) { + colorizeFilter->setColor(d->color); + colorizeFilter->setStrength(d->strength); + colorizeFilter->draw(painter, dest, src, srcRect); + return; + } + + // falling back to raster implementation + + if (!d->opaque) { + painter->drawPixmap(dest, src, srcRect); + return; + } + + 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 (d->alphaBlend) { + // alpha blending srcImage and destImage + QImage buffer = srcImage; + QPainter bufPainter(&buffer); + bufPainter.setOpacity(d->strength); + bufPainter.drawImage(0, 0, destImage); + bufPainter.end(); + destImage = buffer; + } + + if (srcImage.hasAlphaChannel()) + destImage.setAlphaChannel(srcImage.alphaChannel()); + + painter->drawImage(dest, destImage); +} + +class QPixmapDropShadowFilterPrivate : public QPixmapFilterPrivate +{ +public: + QPixmapDropShadowFilterPrivate() + : offset(8, 8), color(63, 63, 63, 180), radius(1) {} + + QPointF offset; + QColor color; + qreal radius; +}; + +/*! + \class QPixmapDropShadowFilter + \since 4.5 + \ingroup painting + + \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) +{ +} + +/*! + Destroys drop shadow filter. + + \internal +*/ +QPixmapDropShadowFilter::~QPixmapDropShadowFilter() +{ +} + +/*! + 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; +} + +/*! + 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 +*/ + +/*! + \internal + */ +QRectF QPixmapDropShadowFilter::boundingRectFor(const QRectF &rect) const +{ + Q_D(const QPixmapDropShadowFilter); + return rect.united(rect.translated(d->offset).adjusted(-d->radius, -d->radius, d->radius, d->radius)); +} + +/*! + \internal + */ +void QPixmapDropShadowFilter::draw(QPainter *p, + const QPointF &pos, + const QPixmap &px, + const QRectF &src) const +{ + Q_D(const QPixmapDropShadowFilter); + + if (px.isNull()) + return; + + QPixmapFilter *filter = p->paintEngine() && p->paintEngine()->isExtended() ? + static_cast<QPaintEngineEx *>(p->paintEngine())->pixmapFilter(type(), this) : 0; + QPixmapDropShadowFilter *dropShadowFilter = static_cast<QPixmapDropShadowFilter*>(filter); + if (dropShadowFilter) { + dropShadowFilter->setColor(d->color); + dropShadowFilter->setBlurRadius(d->radius); + dropShadowFilter->setOffset(d->offset); + dropShadowFilter->draw(p, pos, px, src); + return; + } + + QImage tmp(px.size(), QImage::Format_ARGB32_Premultiplied); + tmp.fill(0); + QPainter tmpPainter(&tmp); + tmpPainter.setCompositionMode(QPainter::CompositionMode_Source); + tmpPainter.drawPixmap(d->offset, px); + tmpPainter.end(); + + // blur the alpha channel + QImage blurred(tmp.size(), QImage::Format_ARGB32_Premultiplied); + blurred.fill(0); + QPainter blurPainter(&blurred); + qt_blurImage(&blurPainter, tmp, d->radius, false, true); + blurPainter.end(); + + tmp = blurred; + + // blacken the image... + tmpPainter.begin(&tmp); + tmpPainter.setCompositionMode(QPainter::CompositionMode_SourceIn); + tmpPainter.fillRect(tmp.rect(), d->color); + tmpPainter.end(); + + // draw the blurred drop shadow... + p->drawImage(pos, tmp); + + // Draw the actual pixmap... + p->drawPixmap(pos, px, src); +} + +QT_END_NAMESPACE + +#endif //QT_NO_GRAPHICSEFFECT |