Merge WebKit at r75993: Initial merge by git.

Change-Id: I602bbdc3974787a3b0450456a30a7868286921c3

1 files changed, 361 insertions, 0 deletions

diff --git a/Source/WebCore/rendering/svg/RenderSVGRoot.cpp b/Source/WebCore/rendering/svg/RenderSVGRoot.cpp
new file mode 100644
index 0000000..aa87b09
--- /dev/null
+++ b/Source/WebCore/rendering/svg/RenderSVGRoot.cpp
@@ -0,0 +1,361 @@
+/*
+ * Copyright (C) 2004, 2005, 2007 Nikolas Zimmermann <zimmermann@kde.org>
+ * Copyright (C) 2004, 2005, 2007, 2008, 2009 Rob Buis <buis@kde.org>
+ * Copyright (C) 2007 Eric Seidel <eric@webkit.org>
+ * Copyright (C) 2009 Google, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public License
+ * along with this library; see the file COPYING.LIB.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#include "config.h"
+
+#if ENABLE(SVG)
+#include "RenderSVGRoot.h"
+
+#include "GraphicsContext.h"
+#include "HitTestResult.h"
+#include "RenderSVGContainer.h"
+#include "RenderSVGResource.h"
+#include "RenderView.h"
+#include "SVGLength.h"
+#include "SVGRenderSupport.h"
+#include "SVGResources.h"
+#include "SVGSVGElement.h"
+#include "SVGStyledElement.h"
+#include "TransformState.h"
+
+#if ENABLE(FILTERS)
+#include "RenderSVGResourceFilter.h"
+#endif
+
+using namespace std;
+
+namespace WebCore {
+
+RenderSVGRoot::RenderSVGRoot(SVGStyledElement* node)
+    : RenderBox(node)
+    , m_isLayoutSizeChanged(false)
+    , m_needsBoundariesOrTransformUpdate(true)
+{
+    setReplaced(true);
+}
+
+RenderSVGRoot::~RenderSVGRoot()
+{
+}
+
+void RenderSVGRoot::computePreferredLogicalWidths()
+{
+    ASSERT(preferredLogicalWidthsDirty());
+
+    int borderAndPadding = borderAndPaddingWidth();
+    int width = computeReplacedLogicalWidth(false) + borderAndPadding;
+
+    if (style()->maxWidth().isFixed() && style()->maxWidth().value() != undefinedLength)
+        width = min(width, style()->maxWidth().value() + (style()->boxSizing() == CONTENT_BOX ? borderAndPadding : 0));
+
+    if (style()->width().isPercent() || (style()->width().isAuto() && style()->height().isPercent())) {
+        m_minPreferredLogicalWidth = 0;
+        m_maxPreferredLogicalWidth = width;
+    } else
+        m_minPreferredLogicalWidth = m_maxPreferredLogicalWidth = width;
+
+    setPreferredLogicalWidthsDirty(false);
+}
+
+int RenderSVGRoot::computeReplacedLogicalWidth(bool includeMaxWidth) const
+{
+    int replacedWidth = RenderBox::computeReplacedLogicalWidth(includeMaxWidth);
+    if (!style()->logicalWidth().isPercent())
+        return replacedWidth;
+
+    // FIXME: Investigate in size rounding issues
+    SVGSVGElement* svg = static_cast<SVGSVGElement*>(node());
+    return static_cast<int>(roundf(replacedWidth * svg->currentScale()));
+}
+
+int RenderSVGRoot::computeReplacedLogicalHeight() const
+{
+    int replacedHeight = RenderBox::computeReplacedLogicalHeight();
+    if (!style()->logicalHeight().isPercent())
+        return replacedHeight;
+
+    // FIXME: Investigate in size rounding issues
+    SVGSVGElement* svg = static_cast<SVGSVGElement*>(node());
+    return static_cast<int>(roundf(replacedHeight * svg->currentScale()));
+}
+
+void RenderSVGRoot::layout()
+{
+    ASSERT(needsLayout());
+
+    // Arbitrary affine transforms are incompatible with LayoutState.
+    view()->disableLayoutState();
+
+    bool needsLayout = selfNeedsLayout();
+    LayoutRepainter repainter(*this, checkForRepaintDuringLayout() && needsLayout);
+
+    IntSize oldSize(width(), height());
+    computeLogicalWidth();
+    computeLogicalHeight();
+    calcViewport();
+
+    SVGSVGElement* svg = static_cast<SVGSVGElement*>(node());
+    m_isLayoutSizeChanged = svg->hasRelativeLengths() && oldSize != size();
+
+    SVGRenderSupport::layoutChildren(this, needsLayout);
+    m_isLayoutSizeChanged = false;
+
+    // At this point LayoutRepainter already grabbed the old bounds,
+    // recalculate them now so repaintAfterLayout() uses the new bounds.
+    if (m_needsBoundariesOrTransformUpdate) {
+        updateCachedBoundaries();
+        m_needsBoundariesOrTransformUpdate = false;
+    }
+
+    repainter.repaintAfterLayout();
+
+    view()->enableLayoutState();
+    setNeedsLayout(false);
+}
+
+bool RenderSVGRoot::selfWillPaint()
+{
+#if ENABLE(FILTERS)
+    SVGResources* resources = SVGResourcesCache::cachedResourcesForRenderObject(this);
+    return resources && resources->filter();
+#else
+    return false;
+#endif
+}
+
+void RenderSVGRoot::paint(PaintInfo& paintInfo, int parentX, int parentY)
+{
+    if (paintInfo.context->paintingDisabled())
+        return;
+
+    bool isVisible = style()->visibility() == VISIBLE;
+    IntPoint parentOriginInContainer(parentX, parentY);
+    IntPoint borderBoxOriginInContainer = parentOriginInContainer + parentOriginToBorderBox();
+
+    if (hasBoxDecorations() && (paintInfo.phase == PaintPhaseBlockBackground || paintInfo.phase == PaintPhaseChildBlockBackground) && isVisible)
+        paintBoxDecorations(paintInfo, borderBoxOriginInContainer.x(), borderBoxOriginInContainer.y());
+
+    if (paintInfo.phase == PaintPhaseBlockBackground)
+        return;
+
+    // An empty viewport disables rendering.  FIXME: Should we still render filters?
+    if (m_viewportSize.isEmpty())
+        return;
+
+    // Don't paint if we don't have kids, except if we have filters we should paint those.
+    if (!firstChild() && !selfWillPaint())
+        return;
+
+    // Make a copy of the PaintInfo because applyTransform will modify the damage rect.
+    PaintInfo childPaintInfo(paintInfo);
+    childPaintInfo.context->save();
+
+    // Apply initial viewport clip - not affected by overflow handling
+    childPaintInfo.context->clip(overflowClipRect(borderBoxOriginInContainer.x(), borderBoxOriginInContainer.y()));
+
+    // Convert from container offsets (html renderers) to a relative transform (svg renderers).
+    // Transform from our paint container's coordinate system to our local coords.
+    childPaintInfo.applyTransform(localToRepaintContainerTransform(parentOriginInContainer));
+
+    bool continueRendering = true;
+    if (childPaintInfo.phase == PaintPhaseForeground)
+        continueRendering = SVGRenderSupport::prepareToRenderSVGContent(this, childPaintInfo);
+
+    if (continueRendering)
+        RenderBox::paint(childPaintInfo, 0, 0);
+
+    if (childPaintInfo.phase == PaintPhaseForeground)
+        SVGRenderSupport::finishRenderSVGContent(this, childPaintInfo, paintInfo.context);
+
+    childPaintInfo.context->restore();
+
+    if ((paintInfo.phase == PaintPhaseOutline || paintInfo.phase == PaintPhaseSelfOutline) && style()->outlineWidth() && isVisible)
+        paintOutline(paintInfo.context, borderBoxOriginInContainer.x(), borderBoxOriginInContainer.y(), width(), height());
+}
+
+void RenderSVGRoot::destroy()
+{
+    SVGResourcesCache::clientDestroyed(this);
+    RenderBox::destroy();
+}
+
+void RenderSVGRoot::styleWillChange(StyleDifference diff, const RenderStyle* newStyle)
+{
+    if (diff == StyleDifferenceLayout)
+        setNeedsBoundariesUpdate();
+    RenderBox::styleWillChange(diff, newStyle);
+}
+
+void RenderSVGRoot::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle)
+{
+    RenderBox::styleDidChange(diff, oldStyle);
+    SVGResourcesCache::clientStyleChanged(this, diff, style());
+}
+
+void RenderSVGRoot::updateFromElement()
+{
+    RenderBox::updateFromElement();
+    SVGResourcesCache::clientUpdatedFromElement(this, style());
+}
+
+void RenderSVGRoot::calcViewport()
+{
+    SVGSVGElement* svg = static_cast<SVGSVGElement*>(node());
+
+    if (!svg->hasSetContainerSize()) {
+        // In the normal case of <svg> being stand-alone or in a CSSBoxModel object we use
+        // RenderBox::width()/height() (which pulls data from RenderStyle)
+        m_viewportSize = FloatSize(width(), height());
+        return;
+    }
+
+    // In the SVGImage case grab the SVGLength values off of SVGSVGElement and use
+    // the special relativeWidthValue accessors which respect the specified containerSize
+    // FIXME: Check how SVGImage + zooming is supposed to be handled?
+    SVGLength width = svg->width();
+    SVGLength height = svg->height();
+    m_viewportSize = FloatSize(width.unitType() == LengthTypePercentage ? svg->relativeWidthValue() : width.value(svg),
+                               height.unitType() == LengthTypePercentage ? svg->relativeHeightValue() : height.value(svg));
+}
+
+// RenderBox methods will expect coordinates w/o any transforms in coordinates
+// relative to our borderBox origin.  This method gives us exactly that.
+AffineTransform RenderSVGRoot::localToBorderBoxTransform() const
+{
+    IntSize borderAndPadding = borderOriginToContentBox();
+    SVGSVGElement* svg = static_cast<SVGSVGElement*>(node());
+    float scale = svg->currentScale();
+    FloatPoint translate = svg->currentTranslate();
+    AffineTransform ctm(scale, 0, 0, scale, borderAndPadding.width() + translate.x(), borderAndPadding.height() + translate.y());
+    return svg->viewBoxToViewTransform(width() / scale, height() / scale) * ctm;
+}
+
+IntSize RenderSVGRoot::parentOriginToBorderBox() const
+{
+    return IntSize(x(), y());
+}
+
+IntSize RenderSVGRoot::borderOriginToContentBox() const
+{
+    return IntSize(borderLeft() + paddingLeft(), borderTop() + paddingTop());
+}
+
+AffineTransform RenderSVGRoot::localToRepaintContainerTransform(const IntPoint& parentOriginInContainer) const
+{
+    AffineTransform parentToContainer(localToParentTransform());
+    return parentToContainer.translateRight(parentOriginInContainer.x(), parentOriginInContainer.y());
+}
+
+const AffineTransform& RenderSVGRoot::localToParentTransform() const
+{
+    IntSize parentToBorderBoxOffset = parentOriginToBorderBox();
+
+    AffineTransform borderBoxOriginToParentOrigin(localToBorderBoxTransform());
+    borderBoxOriginToParentOrigin.translateRight(parentToBorderBoxOffset.width(), parentToBorderBoxOffset.height());
+
+    m_localToParentTransform = borderBoxOriginToParentOrigin;
+    return m_localToParentTransform;
+}
+
+IntRect RenderSVGRoot::clippedOverflowRectForRepaint(RenderBoxModelObject* repaintContainer)
+{
+    return SVGRenderSupport::clippedOverflowRectForRepaint(this, repaintContainer);
+}
+
+void RenderSVGRoot::computeRectForRepaint(RenderBoxModelObject* repaintContainer, IntRect& repaintRect, bool fixed)
+{
+    // Apply our local transforms (except for x/y translation), then our shadow, 
+    // and then call RenderBox's method to handle all the normal CSS Box model bits
+    repaintRect = localToBorderBoxTransform().mapRect(repaintRect);
+
+    // Apply initial viewport clip - not affected by overflow settings    
+    repaintRect.intersect(enclosingIntRect(FloatRect(FloatPoint(), m_viewportSize)));
+
+    const SVGRenderStyle* svgStyle = style()->svgStyle();
+    if (const ShadowData* shadow = svgStyle->shadow())
+        shadow->adjustRectForShadow(repaintRect);
+
+    RenderBox::computeRectForRepaint(repaintContainer, repaintRect, fixed);
+}
+
+void RenderSVGRoot::mapLocalToContainer(RenderBoxModelObject* repaintContainer, bool fixed , bool useTransforms, TransformState& transformState) const
+{
+    ASSERT(!fixed); // We should have no fixed content in the SVG rendering tree.
+    ASSERT(useTransforms); // mapping a point through SVG w/o respecting trasnforms is useless.
+
+    // Transform to our border box and let RenderBox transform the rest of the way.
+    transformState.applyTransform(localToBorderBoxTransform());
+    RenderBox::mapLocalToContainer(repaintContainer, fixed, useTransforms, transformState);
+}
+
+void RenderSVGRoot::updateCachedBoundaries()
+{
+    m_objectBoundingBox = FloatRect();
+    m_strokeBoundingBox = FloatRect();
+    m_repaintBoundingBox = FloatRect();
+
+    SVGRenderSupport::computeContainerBoundingBoxes(this, m_objectBoundingBox, m_strokeBoundingBox, m_repaintBoundingBox);
+    SVGRenderSupport::intersectRepaintRectWithResources(this, m_repaintBoundingBox);
+    m_repaintBoundingBox.inflate(borderAndPaddingWidth());
+}
+
+bool RenderSVGRoot::nodeAtPoint(const HitTestRequest& request, HitTestResult& result, int x, int y, int tx, int ty, HitTestAction hitTestAction)
+{
+    IntPoint pointInContainer(x, y);
+    IntSize containerToParentOffset(tx, ty);
+
+    IntPoint pointInParent = pointInContainer - containerToParentOffset;
+    IntPoint pointInBorderBox = pointInParent - parentOriginToBorderBox();
+
+    // Note: For now, we're ignoring hits to border and padding for <svg>
+    IntPoint pointInContentBox = pointInBorderBox - borderOriginToContentBox();
+    if (!contentBoxRect().contains(pointInContentBox))
+        return false;
+
+    IntPoint localPoint = localToParentTransform().inverse().mapPoint(pointInParent);
+
+    for (RenderObject* child = lastChild(); child; child = child->previousSibling()) {
+        if (child->nodeAtFloatPoint(request, result, localPoint, hitTestAction)) {
+            // FIXME: CSS/HTML assumes the local point is relative to the border box, right?
+            updateHitTestResult(result, pointInBorderBox);
+            // FIXME: nodeAtFloatPoint() doesn't handle rect-based hit tests yet.
+            result.addNodeToRectBasedTestResult(child->node(), x, y);
+            return true;
+        }
+    }
+
+    // If we didn't early exit above, we've just hit the container <svg> element. Unlike SVG 1.1, 2nd Edition allows container elements to be hit.
+    if (hitTestAction == HitTestBlockBackground) {
+        // Only return true here, if the last hit testing phase 'BlockBackground' is executed. If we'd return true in the 'Foreground' phase,
+        // hit testing would stop immediately. For SVG only trees this doesn't matter. Though when we have a <foreignObject> subtree we need
+        // to be able to detect hits on the background of a <div> element. If we'd return true here in the 'Foreground' phase, we are not able 
+        // to detect these hits anymore.
+        updateHitTestResult(result, roundedIntPoint(localPoint));
+        return true;
+    }
+
+    return false;
+}
+
+}
+
+#endif // ENABLE(SVG)