IntPoint RenderLayerScrollableArea::lastKnownMousePosition() const
{
    return box().frame() ? box().frame()->eventHandler().lastKnownMousePosition() : IntPoint();
}

IntRect PluginProxy::pluginBounds()
{
    return IntRect(IntPoint(), m_pluginSize);
}

ScrollPosition ScrollableArea::scrollPositionFromOffset(ScrollOffset offset) const
{
    return IntPoint(toIntSize(offset) - toIntSize(m_scrollOrigin));
}

void PNGImageDecoder::rowAvailable(unsigned char* rowBuffer, unsigned rowIndex, int)
{
    if (m_frameBufferCache.isEmpty())
        return;

    // Initialize the framebuffer if needed.
    ImageFrame& buffer = m_frameBufferCache[0];
    if (buffer.status() == ImageFrame::FrameEmpty) {
        png_structp png = m_reader->pngPtr();
        if (!buffer.setSize(scaledSize().width(), scaledSize().height())) {
            longjmp(JMPBUF(png), 1);
            return;
        }

        unsigned colorChannels = m_reader->hasAlpha() ? 4 : 3;
        if (PNG_INTERLACE_ADAM7 == png_get_interlace_type(png, m_reader->infoPtr())) {
            m_reader->createInterlaceBuffer(colorChannels * size().width() * size().height());
            if (!m_reader->interlaceBuffer()) {
                longjmp(JMPBUF(png), 1);
                return;
            }
        }

#if USE(QCMSLIB)
        if (m_reader->colorTransform()) {
            m_reader->createRowBuffer(colorChannels * size().width());
            if (!m_reader->rowBuffer()) {
                longjmp(JMPBUF(png), 1);
                return;
            }
        }
#endif
        buffer.setStatus(ImageFrame::FramePartial);
        buffer.setHasAlpha(false);
        buffer.setColorProfile(m_colorProfile);

        // For PNGs, the frame always fills the entire image.
        buffer.setOriginalFrameRect(IntRect(IntPoint(), size()));
    }

    /* libpng comments (here to explain what follows).
     *
     * this function is called for every row in the image.  If the
     * image is interlacing, and you turned on the interlace handler,
     * this function will be called for every row in every pass.
     * Some of these rows will not be changed from the previous pass.
     * When the row is not changed, the new_row variable will be NULL.
     * The rows and passes are called in order, so you don't really
     * need the row_num and pass, but I'm supplying them because it
     * may make your life easier.
     */

    // Nothing to do if the row is unchanged, or the row is outside
    // the image bounds: libpng may send extra rows, ignore them to
    // make our lives easier.
    if (!rowBuffer)
        return;
    int y = !m_scaled ? rowIndex : scaledY(rowIndex);
    if (y < 0 || y >= scaledSize().height())
        return;

    /* libpng comments (continued).
     *
     * For the non-NULL rows of interlaced images, you must call
     * png_progressive_combine_row() passing in the row and the
     * old row.  You can call this function for NULL rows (it will
     * just return) and for non-interlaced images (it just does the
     * memcpy for you) if it will make the code easier.  Thus, you
     * can just do this for all cases:
     *
     *    png_progressive_combine_row(png_ptr, old_row, new_row);
     *
     * where old_row is what was displayed for previous rows.  Note
     * that the first pass (pass == 0 really) will completely cover
     * the old row, so the rows do not have to be initialized.  After
     * the first pass (and only for interlaced images), you will have
     * to pass the current row, and the function will combine the
     * old row and the new row.
     */

    bool hasAlpha = m_reader->hasAlpha();
    unsigned colorChannels = hasAlpha ? 4 : 3;
    png_bytep row = rowBuffer;

    if (png_bytep interlaceBuffer = m_reader->interlaceBuffer()) {
        row = interlaceBuffer + (rowIndex * colorChannels * size().width());
        png_progressive_combine_row(m_reader->pngPtr(), row, rowBuffer);
    }

#if USE(QCMSLIB)
    if (qcms_transform* transform = m_reader->colorTransform()) {
        qcms_transform_data(transform, row, m_reader->rowBuffer(), size().width());
        row = m_reader->rowBuffer();
    }
#endif

    // Write the decoded row pixels to the frame buffer.
    ImageFrame::PixelData* address = buffer.getAddr(0, y);
    int width = scaledSize().width();
    unsigned char nonTrivialAlphaMask = 0;
//.........这里部分代码省略.........

IntPoint ClipboardWx::dragLocation() const 
{ 
    notImplemented();
    return IntPoint(0,0);
}

void NetscapePlugin::geometryDidChange(const IntSize& pluginSize, const IntRect& clipRect, const AffineTransform& pluginToRootViewTransform)
{
    ASSERT(m_isStarted);

    if (pluginSize == m_pluginSize && m_clipRect == clipRect && m_pluginToRootViewTransform == pluginToRootViewTransform) {
        // Nothing to do.
        return;
    }

    bool shouldCallSetWindow = true;

    // If the plug-in doesn't want window relative coordinates, we don't need to call setWindow unless its size or clip rect changes.
    if (m_hasCalledSetWindow && wantsPluginRelativeNPWindowCoordinates() && m_pluginSize == pluginSize && m_clipRect == clipRect)
        shouldCallSetWindow = false;

    m_pluginSize = pluginSize;
    m_clipRect = clipRect;
    m_pluginToRootViewTransform = pluginToRootViewTransform;

    IntPoint frameRectLocationInWindowCoordinates = m_pluginToRootViewTransform.mapPoint(IntPoint());
    m_frameRectInWindowCoordinates = IntRect(frameRectLocationInWindowCoordinates, m_pluginSize);

    platformGeometryDidChange();

    if (!shouldCallSetWindow)
        return;

    callSetWindow();
}

IntRect Image::rect() const
{
    return IntRect(IntPoint(), size());
}

void PaintPropertyTreeBuilder::updateFramePropertiesAndContext(
    FrameView& frameView,
    PaintPropertyTreeBuilderContext& context) {
  if (RuntimeEnabledFeatures::rootLayerScrollingEnabled()) {
    // With root layer scrolling, the LayoutView (a LayoutObject) properties are
    // updated like other objects (see updatePropertiesAndContextForSelf and
    // updatePropertiesAndContextForChildren) instead of needing LayoutView-
    // specific property updates here.
    context.current.paintOffset.moveBy(frameView.location());
    context.current.renderingContextID = 0;
    context.current.shouldFlattenInheritedTransform = true;
    context.absolutePosition = context.current;
    context.containerForAbsolutePosition = nullptr;
    context.fixedPosition = context.current;
    return;
  }

  TransformationMatrix frameTranslate;
  frameTranslate.translate(frameView.x() + context.current.paintOffset.x(),
                           frameView.y() + context.current.paintOffset.y());
  updateFrameViewPreTranslation(frameView, context.current.transform,
                                frameTranslate, FloatPoint3D());

  FloatRoundedRect contentClip(
      IntRect(IntPoint(), frameView.visibleContentSize()));
  updateFrameViewContentClip(frameView, context.current.clip,
                             frameView.preTranslation(), contentClip);

  ScrollOffset scrollOffset = frameView.scrollOffset();
  if (frameView.isScrollable() || !scrollOffset.isZero()) {
    TransformationMatrix frameScroll;
    frameScroll.translate(-scrollOffset.width(), -scrollOffset.height());
    updateFrameViewScrollTranslation(frameView, frameView.preTranslation(),
                                     frameScroll, FloatPoint3D());

    IntSize scrollClip = frameView.visibleContentSize();
    IntSize scrollBounds = frameView.contentsSize();
    bool userScrollableHorizontal =
        frameView.userInputScrollable(HorizontalScrollbar);
    bool userScrollableVertical =
        frameView.userInputScrollable(VerticalScrollbar);
    updateFrameViewScroll(frameView, context.current.scroll,
                          frameView.scrollTranslation(), scrollClip,
                          scrollBounds, userScrollableHorizontal,
                          userScrollableVertical);
  } else {
    // Ensure pre-existing properties are cleared when there is no scrolling.
    frameView.setScrollTranslation(nullptr);
    frameView.setScroll(nullptr);
  }

  // Initialize the context for current, absolute and fixed position cases.
  // They are the same, except that scroll translation does not apply to
  // fixed position descendants.
  const auto* fixedTransformNode = frameView.preTranslation()
                                       ? frameView.preTranslation()
                                       : context.current.transform;
  auto* fixedScrollNode = context.current.scroll;
  DCHECK(frameView.preTranslation());
  context.current.transform = frameView.preTranslation();
  DCHECK(frameView.contentClip());
  context.current.clip = frameView.contentClip();
  if (const auto* scrollTranslation = frameView.scrollTranslation())
    context.current.transform = scrollTranslation;
  if (auto* scroll = frameView.scroll())
    context.current.scroll = scroll;
  context.current.paintOffset = LayoutPoint();
  context.current.renderingContextID = 0;
  context.current.shouldFlattenInheritedTransform = true;
  context.absolutePosition = context.current;
  context.containerForAbsolutePosition = nullptr;
  context.fixedPosition = context.current;
  context.fixedPosition.transform = fixedTransformNode;
  context.fixedPosition.scroll = fixedScrollNode;

  std::unique_ptr<PropertyTreeState> contentsState(
      new PropertyTreeState(context.current.transform, context.current.clip,
                            context.currentEffect, context.current.scroll));
  frameView.setTotalPropertyTreeStateForContents(std::move(contentsState));
}

	void ScrollView::setPosition(int _left, int _top)
	{
		setPosition(IntPoint(_left, _top));
	}

	void ScrollView::setContentPosition(const IntPoint& _point)
	{
		if (mRealClient != nullptr)
			mRealClient->setPosition(IntPoint() - _point);
	}

	IntPoint ScrollView::getContentPosition()
	{
		return mRealClient == nullptr ? IntPoint() : (IntPoint() - mRealClient->getPosition());
	}

IntPoint WebChromeClient::screenToWindow(const IntPoint&) const
{
    notImplemented();
    return IntPoint();
}

IntRect::IntRect(const RECT& r)
    : m_location(IntPoint(r.left, r.top)), m_size(IntSize(r.right-r.left, r.bottom-r.top))
{
}

IntRect EllipsisBox::selectionRect()
{
    RenderStyle* style = renderer().style(isFirstLineStyle());
    const Font& font = style->font();
    return enclosingIntRect(font.selectionRectForText(constructTextRun(&renderer(), font, m_str, style, TextRun::AllowTrailingExpansion), IntPoint(logicalLeft(), logicalTop() + root().selectionTopAdjustedForPrecedingBlock()), root().selectionHeightAdjustedForPrecedingBlock()));
}

void ScrollAnimator::notifyPositionChanged()
{
    m_scrollableArea->setScrollOffsetFromAnimation(IntPoint(m_currentPosX, m_currentPosY));
}

void RenderFrameSet::positionFramesWithFlattening()
{
    RenderBox* child = firstChildBox();
    if (!child)
        return;

    int rows = frameSetElement().totalRows();
    int cols = frameSetElement().totalCols();

    int borderThickness = frameSetElement().border();
    bool repaintNeeded = false;

    // calculate frameset height based on actual content height to eliminate scrolling
    bool out = false;
    for (int r = 0; r < rows && !out; ++r) {
        int extra = 0;
        int height = m_rows.m_sizes[r];

        for (int c = 0; c < cols; ++c) {
            IntRect oldFrameRect = snappedIntRect(child->frameRect());

            int width = m_cols.m_sizes[c];

            bool fixedWidth = frameSetElement().colLengths() && frameSetElement().colLengths()[c].isFixed();
            bool fixedHeight = frameSetElement().rowLengths() && frameSetElement().rowLengths()[r].isFixed();

            // has to be resized and itself resize its contents
            if (!fixedWidth)
                child->setWidth(width ? width + extra / (cols - c) : 0);
            else
                child->setWidth(width);
            child->setHeight(height);

            child->setNeedsLayout();

            if (is<RenderFrameSet>(*child))
                downcast<RenderFrameSet>(*child).layout();
            else
                downcast<RenderFrame>(*child).layoutWithFlattening(fixedWidth, fixedHeight);

            if (child->height() > m_rows.m_sizes[r])
                m_rows.m_sizes[r] = child->height();
            if (child->width() > m_cols.m_sizes[c])
                m_cols.m_sizes[c] = child->width();

            if (child->frameRect() != oldFrameRect)
                repaintNeeded = true;

            // difference between calculated frame width and the width it actually decides to have
            extra += width - m_cols.m_sizes[c];

            child = child->nextSiblingBox();
            if (!child) {
                out = true;
                break;
            }
        }
    }

    int xPos = 0;
    int yPos = 0;
    out = false;
    child = firstChildBox();
    for (int r = 0; r < rows && !out; ++r) {
        xPos = 0;
        for (int c = 0; c < cols; ++c) {
            // ensure the rows and columns are filled
            IntRect oldRect = snappedIntRect(child->frameRect());

            child->setLocation(IntPoint(xPos, yPos));
            child->setHeight(m_rows.m_sizes[r]);
            child->setWidth(m_cols.m_sizes[c]);

            if (child->frameRect() != oldRect) {
                repaintNeeded = true;

                // update to final size
                child->setNeedsLayout();
                if (is<RenderFrameSet>(*child))
                    downcast<RenderFrameSet>(*child).layout();
                else
                    downcast<RenderFrame>(*child).layoutWithFlattening(true, true);
            }

            xPos += m_cols.m_sizes[c] + borderThickness;
            child = child->nextSiblingBox();
            if (!child) {
                out = true;
                break;
            }
        }
        yPos += m_rows.m_sizes[r] + borderThickness;
    }

    setWidth(xPos - borderThickness);
    setHeight(yPos - borderThickness);

    if (repaintNeeded)
        repaint();

//.........这里部分代码省略.........

IntPoint Plugin::convertToRootView(const IntPoint&) const
{
    ASSERT_NOT_REACHED();
    return IntPoint();
}

PlatformGestureEventBuilder::PlatformGestureEventBuilder(Widget* widget, const WebGestureEvent& e)
{
    float scale = widgetScaleFactor(widget);
    switch (e.type) {
    case WebInputEvent::GestureScrollBegin:
        m_type = PlatformEvent::GestureScrollBegin;
        break;
    case WebInputEvent::GestureScrollEnd:
        m_type = PlatformEvent::GestureScrollEnd;
        break;
    case WebInputEvent::GestureScrollUpdate:
        m_type = PlatformEvent::GestureScrollUpdate;
        m_deltaX = e.data.scrollUpdate.deltaX / scale;
        m_deltaY = e.data.scrollUpdate.deltaY / scale;
        break;
    case WebInputEvent::GestureScrollUpdateWithoutPropagation:
        m_type = PlatformEvent::GestureScrollUpdateWithoutPropagation;
        m_deltaX = e.data.scrollUpdate.deltaX / scale;
        m_deltaY = e.data.scrollUpdate.deltaY / scale;
        break;
    case WebInputEvent::GestureTap:
        m_type = PlatformEvent::GestureTap;
        m_area = expandedIntSize(FloatSize(e.data.tap.width / scale, e.data.tap.height / scale));
        // FIXME: PlatformGestureEvent deltaX is overloaded - wkb.ug/93123
        m_deltaX = static_cast<int>(e.data.tap.tapCount);
        break;
    case WebInputEvent::GestureTapUnconfirmed:
        m_type = PlatformEvent::GestureTapUnconfirmed;
        m_area = expandedIntSize(FloatSize(e.data.tap.width / scale, e.data.tap.height / scale));
        break;
    case WebInputEvent::GestureTapDown:
        m_type = PlatformEvent::GestureTapDown;
        m_area = expandedIntSize(FloatSize(e.data.tapDown.width / scale, e.data.tapDown.height / scale));
        break;
    case WebInputEvent::GestureTapCancel:
        m_type = PlatformEvent::GestureTapDownCancel;
        break;
    case WebInputEvent::GestureDoubleTap:
        // DoubleTap gesture is now handled as PlatformEvent::GestureTap with tap_count = 2. So no
        // need to convert to a Platfrom DoubleTap gesture. But in WebViewImpl::handleGestureEvent
        // all WebGestureEvent are converted to PlatformGestureEvent, for completeness and not reach
        // the ASSERT_NOT_REACHED() at the end, convert the DoubleTap to a NoType.
        m_type = PlatformEvent::NoType;
        break;
    case WebInputEvent::GestureTwoFingerTap:
        m_type = PlatformEvent::GestureTwoFingerTap;
        m_area = expandedIntSize(FloatSize(e.data.twoFingerTap.firstFingerWidth / scale, e.data.twoFingerTap.firstFingerHeight / scale));
        break;
    case WebInputEvent::GestureLongPress:
        m_type = PlatformEvent::GestureLongPress;
        m_area = expandedIntSize(FloatSize(e.data.longPress.width / scale, e.data.longPress.height / scale));
        break;
    case WebInputEvent::GestureLongTap:
        m_type = PlatformEvent::GestureLongTap;
        m_area = expandedIntSize(FloatSize(e.data.longPress.width / scale, e.data.longPress.height / scale));
        break;
    case WebInputEvent::GesturePinchBegin:
        m_type = PlatformEvent::GesturePinchBegin;
        break;
    case WebInputEvent::GesturePinchEnd:
        m_type = PlatformEvent::GesturePinchEnd;
        break;
    case WebInputEvent::GesturePinchUpdate:
        m_type = PlatformEvent::GesturePinchUpdate;
        // FIXME: PlatformGestureEvent deltaX is overloaded - wkb.ug/93123
        m_deltaX = e.data.pinchUpdate.scale;
        break;
    default:
        ASSERT_NOT_REACHED();
    }
    m_position = widget->convertFromContainingWindow(IntPoint(e.x / scale, e.y / scale));
    m_globalPosition = IntPoint(e.globalX, e.globalY);
    m_timestamp = e.timeStampSeconds;

    m_modifiers = 0;
    if (e.modifiers & WebInputEvent::ShiftKey)
        m_modifiers |= PlatformEvent::ShiftKey;
    if (e.modifiers & WebInputEvent::ControlKey)
        m_modifiers |= PlatformEvent::CtrlKey;
    if (e.modifiers & WebInputEvent::AltKey)
        m_modifiers |= PlatformEvent::AltKey;
    if (e.modifiers & WebInputEvent::MetaKey)
        m_modifiers |= PlatformEvent::MetaKey;
}

void InternalSettings::setPageScaleFactor(float scaleFactor, int x, int y, ExceptionCode& ec)
{
    InternalSettingsGuardForPage();
    page()->setPageScaleFactor(scaleFactor, IntPoint(x, y));
}

IntRect RenderLayerScrollableArea::visibleContentRect(IncludeScrollbarsInRect scrollbarInclusion) const
{
    return IntRect(IntPoint(scrollXOffset(), scrollYOffset()),
        IntSize(max(0, layer()->size().width()), max(0, layer()->size().height())));
}