Remove old dead code

Nothing references this, not even commented out debug code, and some
functions doesn't even have implementations.

Change-Id: I344de26a650b1180f0da78eaece5bd5688fdcd95
Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>

src/gui/painting/qpaintengine_raster.cpp

@@ -552,35 +552,6 @@ bool QRasterPaintEngine::end()
     return true;
 }
 
-/*!
-    \internal
-*/
-void QRasterPaintEngine::releaseBuffer()
-{
-    Q_D(QRasterPaintEngine);
-    d->rasterBuffer.reset(new QRasterBuffer);
-}
-
-/*!
-    \internal
-*/
-QSize QRasterPaintEngine::size() const
-{
-    Q_D(const QRasterPaintEngine);
-    return QSize(d->rasterBuffer->width(), d->rasterBuffer->height());
-}
-
-/*!
-    \internal
-*/
-#ifndef QT_NO_DEBUG
-void QRasterPaintEngine::saveBuffer(const QString &s) const
-{
-    Q_D(const QRasterPaintEngine);
-    d->rasterBuffer->bufferImage().save(s, "PNG");
-}
-#endif
-
 /*!
     \internal
 */
@@ -3845,11 +3816,6 @@ QImage::Format QRasterBuffer::prepare(QImage *image)
     return format;
 }
 
-void QRasterBuffer::resetBuffer(int val)
-{
-    memset(m_buffer, val, m_height*bytes_per_line);
-}
-
 QClipData::QClipData(int height)
 {
     clipSpanHeight = height;
@@ -4272,48 +4238,6 @@ static void qt_span_clip(int count, const QSpan *spans, void *userData)
     }
 }
 
-#ifndef QT_NO_DEBUG
-QImage QRasterBuffer::bufferImage() const
-{
-    QImage image(m_width, m_height, QImage::Format_ARGB32_Premultiplied);
-
-    for (int y = 0; y < m_height; ++y) {
-        uint *span = (uint *)const_cast<QRasterBuffer *>(this)->scanLine(y);
-
-        for (int x=0; x<m_width; ++x) {
-            uint argb = span[x];
-            image.setPixel(x, y, argb);
-        }
-    }
-    return image;
-}
-#endif
-
-
-void QRasterBuffer::flushToARGBImage(QImage *target) const
-{
-    int w = qMin(m_width, target->width());
-    int h = qMin(m_height, target->height());
-
-    for (int y=0; y<h; ++y) {
-        uint *sourceLine = (uint *)const_cast<QRasterBuffer *>(this)->scanLine(y);
-        QRgb *dest = (QRgb *) target->scanLine(y);
-        for (int x=0; x<w; ++x) {
-            QRgb pixel = sourceLine[x];
-            int alpha = qAlpha(pixel);
-            if (!alpha) {
-                dest[x] = 0;
-            } else {
-                dest[x] = (alpha << 24)
-                        | ((255*qRed(pixel)/alpha) << 16)
-                        | ((255*qGreen(pixel)/alpha) << 8)
-                        | ((255*qBlue(pixel)/alpha) << 0);
-            }
-        }
-    }
-}
-
-
 class QGradientCache
 {
 public:

src/gui/painting/qpaintengine_raster_p.h

@@ -208,15 +208,6 @@ public:
     ClipType clipType() const;
     QRect clipBoundingRect() const;
 
-    void releaseBuffer();
-
-    QSize size() const;
-
-#ifndef QT_NO_DEBUG
-    void saveBuffer(const QString &s) const;
-#endif
-
-
 #ifdef Q_OS_WIN
     void setDC(HDC hdc);
     HDC getDC() const;
@@ -442,20 +433,9 @@ public:
     void init();
 
     QImage::Format prepare(QImage *image);
-    QImage::Format prepare(QPixmap *pix);
-    void prepare(int w, int h);
-    void prepareBuffer(int w, int h);
-
-    void resetBuffer(int val=0);
 
     uchar *scanLine(int y) { Q_ASSERT(y>=0); Q_ASSERT(y<m_height); return m_buffer + y * bytes_per_line; }
 
-#ifndef QT_NO_DEBUG
-    QImage bufferImage() const;
-#endif
-
-    void flushToARGBImage(QImage *image) const;
-
     int width() const { return m_width; }
     int height() const { return m_height; }
     int bytesPerLine() const { return bytes_per_line; }

src/widgets/kernel/qwidgetbackingstore.cpp

@@ -310,12 +310,6 @@ bool QWidgetBackingStore::bltRect(const QRect &rect, int dx, int dy, QWidget *wi
     return store->scroll(tlwRect, dx, dy);
 }
 
-void QWidgetBackingStore::releaseBuffer()
-{
-    if (store)
-        store->resize(QSize());
-}
-
 /*!
     Prepares the window surface to paint a\ toClean region of the \a widget and
     updates the BeginPaintInfo struct accordingly.

src/widgets/kernel/qwidgetbackingstore_p.h

@@ -151,7 +151,6 @@ private:
 
     void doSync();
     bool bltRect(const QRect &rect, int dx, int dy, QWidget *widget);
-    void releaseBuffer();
 
     void beginPaint(QRegion &toClean, QWidget *widget, QBackingStore *backingStore,
                     BeginPaintInfo *returnInfo, bool toCleanIsInTopLevelCoordinates = true);