Merge branch '4.6'

Conflicts:
	examples/webkit/fancybrowser/main.cpp
	src/opengl/gl2paintengineex/qpaintengineex_opengl2.cpp
	tools/assistant/tools/assistant/bookmarkmanager.cpp

4 files changed, 353 insertions, 129 deletions

diff --git a/src/gui/image/qpixmap.cpp b/src/gui/image/qpixmap.cpp
index 406dc0b..30eb788 100644
--- a/src/gui/image/qpixmap.cpp
+++ b/src/gui/image/qpixmap.cpp
@@ -831,14 +831,13 @@ bool QPixmap::load(const QString &fileName, const char *format, Qt::ImageConvers
     if (QPixmapCache::find(key, *this))
         return true;
 
-    if (!data)
-        data = QPixmapData::create(0, 0, QPixmapData::PixmapType);
-
-    if (data->fromFile(fileName, format, flags)) {
+    QPixmapData *tmp = QPixmapData::create(0, 0, QPixmapData::PixmapType);
+    if (tmp->fromFile(fileName, format, flags)) {
+        data = tmp;
         QPixmapCache::insert(key, *this);
         return true;
     }
-
+    delete tmp;
     return false;
 }
 
diff --git a/src/gui/image/qpixmap_s60.cpp b/src/gui/image/qpixmap_s60.cpp
index dc33ade..8194db5 100644
--- a/src/gui/image/qpixmap_s60.cpp
+++ b/src/gui/image/qpixmap_s60.cpp
@@ -235,7 +235,7 @@ static CFbsBitmap* uncompress(CFbsBitmap* bitmap)
         QT_TRAP_THROWING(bitmapGc = CFbsBitGc::NewL());
         bitmapGc->Activate(bitmapDevice);
 
-        bitmapGc->DrawBitmap(TPoint(), bitmap);
+        bitmapGc->BitBlt(TPoint(), bitmap);
 
         delete bitmapGc;
         delete bitmapDevice;
@@ -346,8 +346,6 @@ QPixmap QPixmap::fromSymbianCFbsBitmap(CFbsBitmap *bitmap)
 QS60PixmapData::QS60PixmapData(PixelType type) : QRasterPixmapData(type),
     symbianBitmapDataAccess(new QSymbianBitmapDataAccess),
     cfbsBitmap(0),
-    bitmapDevice(0),
-    bitmapGc(0),
     pengine(0),
     bytes(0),
     formatLocked(false)
@@ -385,8 +383,6 @@ void QS60PixmapData::resize(int width, int height)
 
         if(cfbsBitmap->SizeInPixels() != newSize) {
             cfbsBitmap->Resize(TSize(width, height));
-            bitmapDevice->Resize(TSize(width, height));
-            bitmapGc->Resized();
             if(pengine) {
                 delete pengine;
                 pengine = 0;
@@ -397,21 +393,10 @@ void QS60PixmapData::resize(int width, int height)
     }
 }
 
-bool QS60PixmapData::initSymbianBitmapContext()
-{
-    QT_TRAP_THROWING(bitmapDevice = CFbsBitmapDevice::NewL(cfbsBitmap));
-    QT_TRAP_THROWING(bitmapGc = CFbsBitGc::NewL());
-    bitmapGc->Activate(bitmapDevice);
-
-    return true;
-}
-
 void QS60PixmapData::release()
 {
     if (cfbsBitmap) {
         QSymbianFbsHeapLock lock(QSymbianFbsHeapLock::Unlock);
-        delete bitmapGc;
-        delete bitmapDevice;
         delete cfbsBitmap;
         lock.relock();
     }
@@ -419,8 +404,6 @@ void QS60PixmapData::release()
     delete pengine;
     image = QImage();
     cfbsBitmap = 0;
-    bitmapGc = 0;
-    bitmapDevice = 0;
     pengine = 0;
     bytes = 0;
 }
@@ -428,42 +411,52 @@ void QS60PixmapData::release()
 /*!
  * Takes ownership of bitmap. Used by window surface
  */
-void QS60PixmapData::fromSymbianBitmap(CFbsBitmap* bitmap)
+void QS60PixmapData::fromSymbianBitmap(CFbsBitmap* bitmap, bool lockFormat)
 {
-	cfbsBitmap = bitmap;
-	formatLocked = true;
+    Q_ASSERT(bitmap);
 
-	 if(!initSymbianBitmapContext()) {
-		qWarning("Could not create CBitmapContext");
-		release();
-		return;
-	}
+    release();
+
+    cfbsBitmap = bitmap;
+    formatLocked = lockFormat;
 
-	setSerialNumber(cfbsBitmap->Handle());
+    setSerialNumber(cfbsBitmap->Handle());
 
-	UPDATE_BUFFER();
+    UPDATE_BUFFER();
 
-	// Create default palette if needed
-	if (cfbsBitmap->DisplayMode() == EGray2) {
-		image.setColorCount(2);
-		image.setColor(0, QColor(Qt::color0).rgba());
-		image.setColor(1, QColor(Qt::color1).rgba());
+    // Create default palette if needed
+    if (cfbsBitmap->DisplayMode() == EGray2) {
+        image.setColorCount(2);
+        image.setColor(0, QColor(Qt::color0).rgba());
+        image.setColor(1, QColor(Qt::color1).rgba());
 
         //Symbian thinks set pixels are white/transparent, Qt thinks they are foreground/solid
         //So invert mono bitmaps so that masks work correctly.
         image.invertPixels();
-	} else if (cfbsBitmap->DisplayMode() == EGray256) {
-		for (int i=0; i < 256; ++i)
-			image.setColor(i, qRgb(i, i, i));
-	}else if (cfbsBitmap->DisplayMode() == EColor256) {
-		const TColor256Util *palette = TColor256Util::Default();
-		for (int i=0; i < 256; ++i)
-			image.setColor(i, (QRgb)(palette->Color256(i).Value()));
-	}
+    } else if (cfbsBitmap->DisplayMode() == EGray256) {
+        for (int i=0; i < 256; ++i)
+            image.setColor(i, qRgb(i, i, i));
+    } else if (cfbsBitmap->DisplayMode() == EColor256) {
+        const TColor256Util *palette = TColor256Util::Default();
+        for (int i=0; i < 256; ++i)
+            image.setColor(i, (QRgb)(palette->Color256(i).Value()));
+    }
+}
+
+QImage QS60PixmapData::toImage(const QRect &r) const
+{
+    QS60PixmapData *that = const_cast<QS60PixmapData*>(this);
+    that->beginDataAccess();
+    QImage copy = that->image.copy(r);
+    that->endDataAccess();
+
+    return copy;
 }
 
 void QS60PixmapData::fromImage(const QImage &img, Qt::ImageConversionFlags flags)
 {
+    release();
+
     QImage sourceImage;
 
     if (pixelType() == BitmapType) {
@@ -517,8 +510,8 @@ void QS60PixmapData::fromImage(const QImage &img, Qt::ImageConversionFlags flags
     }
 
     cfbsBitmap = createSymbianCFbsBitmap(TSize(sourceImage.width(), sourceImage.height()), mode);
-    if (!(cfbsBitmap && initSymbianBitmapContext())) {
-        qWarning("Could not create CFbsBitmap and/or CBitmapContext");
+    if (!cfbsBitmap) {
+        qWarning("Could not create CFbsBitmap");
         release();
         return;
     }
@@ -544,17 +537,8 @@ void QS60PixmapData::fromImage(const QImage &img, Qt::ImageConversionFlags flags
 
 void QS60PixmapData::copy(const QPixmapData *data, const QRect &rect)
 {
-    if (data->pixelType() == BitmapType) {
-        QBitmap::fromImage(data->toImage().copy(rect));
-        return;
-    }
-
     const QS60PixmapData *s60Data = static_cast<const QS60PixmapData*>(data);
-
-    resize(rect.width(), rect.height());
-    cfbsBitmap->SetDisplayMode(s60Data->cfbsBitmap->DisplayMode());
-
-    bitmapGc->BitBlt(TPoint(0, 0), s60Data->cfbsBitmap, qt_QRect2TRect(rect));
+    fromImage(s60Data->toImage(rect), Qt::AutoColor | Qt::OrderedAlphaDither);
 }
 
 bool QS60PixmapData::scroll(int dx, int dy, const QRect &rect)
@@ -661,12 +645,7 @@ void QS60PixmapData::setAlphaChannel(const QPixmap &alphaChannel)
 
 QImage QS60PixmapData::toImage() const
 {
-    QS60PixmapData *that = const_cast<QS60PixmapData*>(this);
-    that->beginDataAccess();
-    QImage copy = that->image.copy();
-    that->endDataAccess();
-
-    return copy;
+    return toImage(QRect());
 }
 
 QPaintEngine* QS60PixmapData::paintEngine() const
@@ -820,7 +799,9 @@ void* QS60PixmapData::toNativeType(NativeType type)
         if(displayMode == EGray2) {
             //Symbian thinks set pixels are white/transparent, Qt thinks they are foreground/solid
             //So invert mono bitmaps so that masks work correctly.
+            beginDataAccess();
             image.invertPixels();
+            endDataAccess();
             needsCopy = true;
         }
 
@@ -828,7 +809,9 @@ void* QS60PixmapData::toNativeType(NativeType type)
             QImage source;
 
             if (convertToArgb32) {
+                beginDataAccess();
                 source = image.convertToFormat(QImage::Format_ARGB32);
+                endDataAccess();
                 displayMode = EColor16MA;
             } else {
                 source = image;
@@ -858,7 +841,9 @@ void* QS60PixmapData::toNativeType(NativeType type)
 
         if(displayMode == EGray2) {
             // restore pixels
+            beginDataAccess();
             image.invertPixels();
+            endDataAccess();
         }
 
         return reinterpret_cast<void*>(bitmap);
diff --git a/src/gui/image/qpixmap_s60_p.h b/src/gui/image/qpixmap_s60_p.h
index 8631ebd..2d93622 100644
--- a/src/gui/image/qpixmap_s60_p.h
+++ b/src/gui/image/qpixmap_s60_p.h
@@ -109,14 +109,12 @@ public:
 
 private:
     void release();
-    void fromSymbianBitmap(CFbsBitmap* bitmap);
-    bool initSymbianBitmapContext();
+    void fromSymbianBitmap(CFbsBitmap* bitmap, bool lockFormat=false);
+    QImage toImage(const QRect &r) const;
 
     QSymbianBitmapDataAccess *symbianBitmapDataAccess;
 
     CFbsBitmap *cfbsBitmap;
-    CFbsBitmapDevice *bitmapDevice;
-    CFbsBitGc *bitmapGc;
     QPaintEngine *pengine;
     uchar* bytes;
 
diff --git a/src/gui/image/qpixmapfilter.cpp b/src/gui/image/qpixmapfilter.cpp
index 3723500..939b86d 100644
--- a/src/gui/image/qpixmapfilter.cpp
+++ b/src/gui/image/qpixmapfilter.cpp
@@ -52,6 +52,10 @@
 #include "private/qgraphicssystem_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
@@ -585,106 +589,338 @@ QGraphicsBlurEffect::BlurHints QPixmapBlurFilter::blurHints() const
     return d->hints;
 }
 
+const qreal radiusScale = qreal(2.5);
+
 /*!
     \internal
 */
 QRectF QPixmapBlurFilter::boundingRectFor(const QRectF &rect) const
 {
     Q_D(const QPixmapBlurFilter);
-    const qreal delta = d->radius + 1;
+    const qreal delta = radiusScale * d->radius + 1;
     return rect.adjusted(-delta, -delta, delta, delta);
 }
 
-// Blur the image according to the blur radius
-// Based on exponential blur algorithm by Jani Huhtanen
-// (maximum radius is set to 16)
-static QImage blurred(const QImage& image, const QRect& rect, int radius, bool alphaOnly = false)
+template <int shift>
+inline int qt_static_shift(int value)
 {
-    int tab[] = { 14, 10, 8, 6, 5, 5, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2 };
-    int alpha = (radius < 1)  ? 16 : (radius > 17) ? 1 : tab[radius-1];
+    if (shift == 0)
+        return value;
+    else if (shift > 0)
+        return value << (uint(shift) & 0x1f);
+    else
+        return value >> (uint(-shift) & 0x1f);
+}
 
-    QImage result = image.convertToFormat(QImage::Format_ARGB32_Premultiplied);
-    int r1 = rect.top();
-    int r2 = rect.bottom();
-    int c1 = rect.left();
-    int c2 = rect.right();
+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
+}
 
-    int bpl = result.bytesPerLine();
-    int rgba[4];
-    unsigned char* p;
+const int alphaIndex = (QSysInfo::ByteOrder == QSysInfo::BigEndian ? 0 : 3);
 
-    int i1 = 0;
-    int i2 = 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);
+}
 
-    if (alphaOnly)
-        i1 = i2 = (QSysInfo::ByteOrder == QSysInfo::BigEndian ? 0 : 3);
+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);
+
+    // 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 <= 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());
+        }
+    }
 
-    for (int col = c1; col <= c2; col++) {
-        p = result.scanLine(r1) + col * 4;
-        for (int i = i1; i <= i2; i++)
-            rgba[i] = p[i] << 4;
+    img_height = temp.height();
+    for (int row = 0; row < img_height; ++row) {
+        for (int i = 0; i <= improvedQuality; ++i)
+            qt_blurrow<aprec, zprec, alphaOnly>(temp, row, alpha);
+    }
 
-        p += bpl;
-        for (int j = r1; j < r2; j++, p += bpl)
-            for (int i = i1; i <= i2; i++)
-                p[i] = (rgba[i] += ((p[i] << 4) - rgba[i]) * alpha / 16) >> 4;
+    if (transposed == 0) {
+        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)) )
 
-    for (int row = r1; row <= r2; row++) {
-        p = result.scanLine(row) + c1 * 4;
-        for (int i = i1; i <= i2; i++)
-            rgba[i] = p[i] << 4;
+Q_GUI_EXPORT QImage qt_halfScaled(const QImage &source)
+{
+    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;
+            }
+        }
 
-        p += 4;
-        for (int j = c1; j < c2; j++, p += 4)
-            for (int i = i1; i <= i2; i++)
-                p[i] = (rgba[i] += ((p[i] << 4) - rgba[i]) * alpha / 16) >> 4;
+        return dest;
+    } else if (source.format() != QImage::Format_ARGB32_Premultiplied
+               && source.format() != QImage::Format_RGB32)
+    {
+        srcImage = source.convertToFormat(QImage::Format_ARGB32_Premultiplied);
     }
 
-    for (int col = c1; col <= c2; col++) {
-        p = result.scanLine(r2) + col * 4;
-        for (int i = i1; i <= i2; i++)
-            rgba[i] = p[i] << 4;
+    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();
 
-        p -= bpl;
-        for (int j = r1; j < r2; j++, p -= bpl)
-            for (int i = i1; i <= i2; i++)
-                p[i] = (rgba[i] += ((p[i] << 4) - rgba[i]) * alpha / 16) >> 4;
+    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]));
     }
 
-    for (int row = r1; row <= r2; row++) {
-        p = result.scanLine(row) + c2 * 4;
-        for (int i = i1; i <= i2; i++)
-            rgba[i] = p[i] << 4;
+    return dest;
+}
 
-        p -= 4;
-        for (int j = c1; j < c2; j++, p -= 4)
-            for (int i = i1; i <= i2; i++)
-                p[i] = (rgba[i] += ((p[i] << 4) - rgba[i]) * alpha / 16) >> 4;
+Q_GUI_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);
     }
 
-    return result;
+    qreal scale = 1;
+    if (radius >= 4) {
+        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_GUI_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);
 }
 
+bool qt_scaleForTransform(const QTransform &transform, qreal *scale);
+
 /*!
     \internal
 */
-void QPixmapBlurFilter::draw(QPainter *painter, const QPointF &p, const QPixmap &src, const QRectF &srcRect) const
+void QPixmapBlurFilter::draw(QPainter *painter, const QPointF &p, const QPixmap &src, const QRectF &rect) const
 {
     Q_D(const QPixmapBlurFilter);
     if (!painter->isActive())
         return;
 
-    if (d->radius <= 0) {
+    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(d->radius);
+        blurFilter->setRadius(scaledRadius);
         blurFilter->setBlurHints(d->hints);
         blurFilter->draw(painter, p, src, srcRect);
         return;
@@ -693,17 +929,17 @@ void QPixmapBlurFilter::draw(QPainter *painter, const QPointF &p, const QPixmap
     QImage srcImage;
     QImage destImage;
 
-    if (srcRect.isNull()) {
+    if (srcRect == src.rect()) {
         srcImage = src.toImage();
-        destImage = blurred(srcImage, srcImage.rect(), qRound(d->radius));
     } else {
         QRect rect = srcRect.toAlignedRect().intersected(src.rect());
-
         srcImage = src.copy(rect).toImage();
-        destImage = blurred(srcImage, srcImage.rect(), qRound(d->radius));
     }
 
-    painter->drawImage(p, destImage);
+    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
@@ -1095,7 +1331,13 @@ void QPixmapDropShadowFilter::draw(QPainter *p,
     tmpPainter.end();
 
     // blur the alpha channel
-    tmp = blurred(tmp, tmp.rect(), qRound(d->radius), true);
+    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);