| /* |
| * Copyright (C) 2004, 2005, 2007, 2008 Nikolas Zimmermann <zimmermann@kde.org> |
| * Copyright (C) 2004, 2005, 2006, 2007, 2008 Rob Buis <buis@kde.org> |
| * Copyright (C) Research In Motion Limited 2009-2010. All rights reserved. |
| * Copyright (C) 2011 Dirk Schulze <krit@webkit.org> |
| * |
| * 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 "core/layout/svg/LayoutSVGResourceClipper.h" |
| |
| #include "core/SVGNames.h" |
| #include "core/dom/ElementTraversal.h" |
| #include "core/layout/HitTestResult.h" |
| #include "core/layout/svg/SVGLayoutSupport.h" |
| #include "core/paint/PaintInfo.h" |
| #include "core/svg/SVGGeometryElement.h" |
| #include "core/svg/SVGUseElement.h" |
| #include "platform/RuntimeEnabledFeatures.h" |
| #include "platform/graphics/paint/SkPictureBuilder.h" |
| #include "third_party/skia/include/core/SkPicture.h" |
| #include "third_party/skia/include/pathops/SkPathOps.h" |
| |
| namespace blink { |
| |
| LayoutSVGResourceClipper::LayoutSVGResourceClipper(SVGClipPathElement* node) |
| : LayoutSVGResourceContainer(node) |
| , m_inClipExpansion(false) |
| { |
| } |
| |
| LayoutSVGResourceClipper::~LayoutSVGResourceClipper() |
| { |
| } |
| |
| void LayoutSVGResourceClipper::removeAllClientsFromCache(bool markForInvalidation) |
| { |
| m_clipContentPath.clear(); |
| m_clipContentPicture.clear(); |
| m_localClipBounds = FloatRect(); |
| markAllClientsForInvalidation(markForInvalidation ? LayoutAndBoundariesInvalidation : ParentOnlyInvalidation); |
| } |
| |
| void LayoutSVGResourceClipper::removeClientFromCache(LayoutObject* client, bool markForInvalidation) |
| { |
| ASSERT(client); |
| markClientForInvalidation(client, markForInvalidation ? BoundariesInvalidation : ParentOnlyInvalidation); |
| } |
| |
| bool LayoutSVGResourceClipper::calculateClipContentPathIfNeeded() |
| { |
| if (!m_clipContentPath.isEmpty()) |
| return true; |
| |
| // If the current clip-path gets clipped itself, we have to fallback to masking. |
| if (style()->svgStyle().hasClipper()) |
| return false; |
| |
| unsigned opCount = 0; |
| bool usingBuilder = false; |
| SkOpBuilder clipPathBuilder; |
| |
| for (SVGElement* childElement = Traversal<SVGElement>::firstChild(*element()); childElement; childElement = Traversal<SVGElement>::nextSibling(*childElement)) { |
| LayoutObject* childLayoutObject = childElement->layoutObject(); |
| if (!childLayoutObject) |
| continue; |
| // Only shapes or paths are supported for direct clipping. We need to fallback to masking for texts. |
| if (childLayoutObject->isSVGText()) { |
| m_clipContentPath.clear(); |
| return false; |
| } |
| if (!childElement->isSVGGraphicsElement()) |
| continue; |
| |
| const ComputedStyle* style = childLayoutObject->style(); |
| if (!style || style->display() == NONE || (style->visibility() != EVisibility::Visible && !isSVGUseElement(*childElement))) |
| continue; |
| |
| // Current shape in clip-path gets clipped too. Fallback to masking. |
| if (style->svgStyle().hasClipper()) { |
| m_clipContentPath.clear(); |
| return false; |
| } |
| |
| // First clip shape. |
| if (m_clipContentPath.isEmpty()) { |
| if (isSVGGeometryElement(childElement)) |
| toSVGGeometryElement(childElement)->toClipPath(m_clipContentPath); |
| else if (isSVGUseElement(childElement)) |
| toSVGUseElement(childElement)->toClipPath(m_clipContentPath); |
| |
| continue; |
| } |
| |
| // Multiple shapes require PathOps. In some degenerate cases PathOps can exhibit quadratic |
| // behavior, so we cap the number of ops to a reasonable count. |
| const unsigned kMaxOps = 42; |
| if (!RuntimeEnabledFeatures::pathOpsSVGClippingEnabled() || ++opCount > kMaxOps) { |
| m_clipContentPath.clear(); |
| return false; |
| } |
| |
| // Second clip shape => start using the builder. |
| if (!usingBuilder) { |
| clipPathBuilder.add(m_clipContentPath.getSkPath(), kUnion_SkPathOp); |
| usingBuilder = true; |
| } |
| |
| Path subPath; |
| if (isSVGGeometryElement(childElement)) |
| toSVGGeometryElement(childElement)->toClipPath(subPath); |
| else if (isSVGUseElement(childElement)) |
| toSVGUseElement(childElement)->toClipPath(subPath); |
| |
| clipPathBuilder.add(subPath.getSkPath(), kUnion_SkPathOp); |
| } |
| |
| if (usingBuilder) { |
| SkPath resolvedPath; |
| clipPathBuilder.resolve(&resolvedPath); |
| m_clipContentPath = resolvedPath; |
| } |
| |
| return true; |
| } |
| |
| bool LayoutSVGResourceClipper::asPath(const AffineTransform& animatedLocalTransform, const FloatRect& referenceBox, Path& clipPath) |
| { |
| if (!calculateClipContentPathIfNeeded()) |
| return false; |
| |
| clipPath = m_clipContentPath; |
| |
| // We are able to represent the clip as a path. Continue with direct clipping, |
| // and transform the content to userspace if necessary. |
| if (clipPathUnits() == SVGUnitTypes::kSvgUnitTypeObjectboundingbox) { |
| AffineTransform transform; |
| transform.translate(referenceBox.x(), referenceBox.y()); |
| transform.scaleNonUniform(referenceBox.width(), referenceBox.height()); |
| clipPath.transform(transform); |
| } |
| |
| // Transform path by animatedLocalTransform. |
| clipPath.transform(animatedLocalTransform); |
| return true; |
| } |
| |
| PassRefPtr<const SkPicture> LayoutSVGResourceClipper::createContentPicture() |
| { |
| ASSERT(frame()); |
| if (m_clipContentPicture) |
| return m_clipContentPicture; |
| |
| // Using strokeBoundingBox (instead of paintInvalidationRectInLocalSVGCoordinates) to avoid the intersection |
| // with local clips/mask, which may yield incorrect results when mixing objectBoundingBox and |
| // userSpaceOnUse units (http://crbug.com/294900). |
| FloatRect bounds = strokeBoundingBox(); |
| |
| SkPictureBuilder pictureBuilder(bounds, nullptr, nullptr); |
| |
| for (SVGElement* childElement = Traversal<SVGElement>::firstChild(*element()); childElement; childElement = Traversal<SVGElement>::nextSibling(*childElement)) { |
| LayoutObject* layoutObject = childElement->layoutObject(); |
| if (!layoutObject) |
| continue; |
| |
| const ComputedStyle* style = layoutObject->style(); |
| if (!style || style->display() == NONE || (style->visibility() != EVisibility::Visible && !isSVGUseElement(*childElement))) |
| continue; |
| |
| bool isUseElement = isSVGUseElement(*childElement); |
| if (isUseElement) { |
| const SVGGraphicsElement* clippingElement = toSVGUseElement(*childElement).visibleTargetGraphicsElementForClipping(); |
| if (!clippingElement) |
| continue; |
| |
| layoutObject = clippingElement->layoutObject(); |
| if (!layoutObject) |
| continue; |
| } |
| |
| // Only shapes, paths and texts are allowed for clipping. |
| if (!layoutObject->isSVGShape() && !layoutObject->isSVGText()) |
| continue; |
| |
| if (isUseElement) |
| layoutObject = childElement->layoutObject(); |
| |
| // Switch to a paint behavior where all children of this <clipPath> will be laid out using special constraints: |
| // - fill-opacity/stroke-opacity/opacity set to 1 |
| // - masker/filter not applied when laying out the children |
| // - fill is set to the initial fill paint server (solid, black) |
| // - stroke is set to the initial stroke paint server (none) |
| PaintInfo info(pictureBuilder.context(), LayoutRect::infiniteIntRect(), PaintPhaseForeground, GlobalPaintNormalPhase, PaintLayerPaintingRenderingClipPathAsMask); |
| layoutObject->paint(info, IntPoint()); |
| } |
| |
| m_clipContentPicture = pictureBuilder.endRecording(); |
| return m_clipContentPicture; |
| } |
| |
| void LayoutSVGResourceClipper::calculateLocalClipBounds() |
| { |
| // This is a rough heuristic to appraise the clip size and doesn't consider clip on clip. |
| for (SVGElement* childElement = Traversal<SVGElement>::firstChild(*element()); childElement; childElement = Traversal<SVGElement>::nextSibling(*childElement)) { |
| LayoutObject* layoutObject = childElement->layoutObject(); |
| if (!layoutObject) |
| continue; |
| if (!layoutObject->isSVGShape() && !layoutObject->isSVGText() && !isSVGUseElement(*childElement)) |
| continue; |
| const ComputedStyle* style = layoutObject->style(); |
| if (!style || style->display() == NONE || (style->visibility() != EVisibility::Visible && !isSVGUseElement(*childElement))) |
| continue; |
| if (isSVGUseElement(*childElement) && !toSVGUseElement(*childElement).visibleTargetGraphicsElementForClipping()) |
| continue; |
| |
| m_localClipBounds.unite(layoutObject->localToSVGParentTransform().mapRect(layoutObject->paintInvalidationRectInLocalSVGCoordinates())); |
| } |
| } |
| |
| bool LayoutSVGResourceClipper::hitTestClipContent(const FloatRect& objectBoundingBox, const FloatPoint& nodeAtPoint) |
| { |
| FloatPoint point = nodeAtPoint; |
| if (!SVGLayoutSupport::pointInClippingArea(this, point)) |
| return false; |
| |
| if (clipPathUnits() == SVGUnitTypes::kSvgUnitTypeObjectboundingbox) { |
| AffineTransform transform; |
| transform.translate(objectBoundingBox.x(), objectBoundingBox.y()); |
| transform.scaleNonUniform(objectBoundingBox.width(), objectBoundingBox.height()); |
| point = transform.inverse().mapPoint(point); |
| } |
| |
| AffineTransform animatedLocalTransform = toSVGClipPathElement(element())->calculateAnimatedLocalTransform(); |
| if (!animatedLocalTransform.isInvertible()) |
| return false; |
| |
| point = animatedLocalTransform.inverse().mapPoint(point); |
| |
| for (SVGElement* childElement = Traversal<SVGElement>::firstChild(*element()); childElement; childElement = Traversal<SVGElement>::nextSibling(*childElement)) { |
| LayoutObject* layoutObject = childElement->layoutObject(); |
| if (!layoutObject) |
| continue; |
| if (!layoutObject->isSVGShape() && !layoutObject->isSVGText() && !isSVGUseElement(*childElement)) |
| continue; |
| IntPoint hitPoint; |
| HitTestResult result(HitTestRequest::SVGClipContent, hitPoint); |
| if (layoutObject->nodeAtFloatPoint(result, point, HitTestForeground)) |
| return true; |
| } |
| |
| return false; |
| } |
| |
| FloatRect LayoutSVGResourceClipper::resourceBoundingBox(const LayoutObject* object) |
| { |
| // Resource was not layouted yet. Give back the boundingBox of the object. |
| if (selfNeedsLayout()) |
| return object->objectBoundingBox(); |
| |
| if (m_localClipBounds.isEmpty()) |
| calculateLocalClipBounds(); |
| |
| AffineTransform transform = toSVGClipPathElement(element())->calculateAnimatedLocalTransform(); |
| if (clipPathUnits() == SVGUnitTypes::kSvgUnitTypeObjectboundingbox) { |
| FloatRect objectBoundingBox = object->objectBoundingBox(); |
| transform.translate(objectBoundingBox.x(), objectBoundingBox.y()); |
| transform.scaleNonUniform(objectBoundingBox.width(), objectBoundingBox.height()); |
| } |
| |
| return transform.mapRect(m_localClipBounds); |
| } |
| |
| } // namespace blink |
