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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
commit5f8de423f190bbb79a62f804151bc24824fa32d8 (patch)
tree10027f336435511475e392454359edea8e25895d /dom/svg/nsSVGPathGeometryElement.h
parent49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff)
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Add m-esr52 at 52.6.0
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-rw-r--r--dom/svg/nsSVGPathGeometryElement.h198
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diff --git a/dom/svg/nsSVGPathGeometryElement.h b/dom/svg/nsSVGPathGeometryElement.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef __NS_SVGPATHGEOMETRYELEMENT_H__
+#define __NS_SVGPATHGEOMETRYELEMENT_H__
+
+#include "mozilla/gfx/2D.h"
+#include "SVGGraphicsElement.h"
+
+struct nsSVGMark {
+ enum Type {
+ eStart,
+ eMid,
+ eEnd,
+
+ eTypeCount
+ };
+
+ float x, y, angle;
+ Type type;
+ nsSVGMark(float aX, float aY, float aAngle, Type aType) :
+ x(aX), y(aY), angle(aAngle), type(aType) {}
+};
+
+typedef mozilla::dom::SVGGraphicsElement nsSVGPathGeometryElementBase;
+
+class nsSVGPathGeometryElement : public nsSVGPathGeometryElementBase
+{
+protected:
+ typedef mozilla::gfx::CapStyle CapStyle;
+ typedef mozilla::gfx::DrawTarget DrawTarget;
+ typedef mozilla::gfx::FillRule FillRule;
+ typedef mozilla::gfx::Float Float;
+ typedef mozilla::gfx::Matrix Matrix;
+ typedef mozilla::gfx::Path Path;
+ typedef mozilla::gfx::Point Point;
+ typedef mozilla::gfx::PathBuilder PathBuilder;
+ typedef mozilla::gfx::Rect Rect;
+ typedef mozilla::gfx::StrokeOptions StrokeOptions;
+
+public:
+ explicit nsSVGPathGeometryElement(already_AddRefed<mozilla::dom::NodeInfo>& aNodeInfo);
+
+ virtual nsresult AfterSetAttr(int32_t aNamespaceID, nsIAtom* aName,
+ const nsAttrValue* aValue, bool aNotify) override;
+
+ /**
+ * Causes this element to discard any Path object that GetOrBuildPath may
+ * have cached.
+ */
+ virtual void ClearAnyCachedPath() override final {
+ mCachedPath = nullptr;
+ }
+
+ virtual bool AttributeDefinesGeometry(const nsIAtom *aName);
+
+ /**
+ * Returns true if this element's geometry depends on the width or height of its
+ * coordinate context (typically the viewport established by its nearest <svg>
+ * ancestor). In other words, returns true if one of the attributes for which
+ * AttributeDefinesGeometry returns true has a percentage value.
+ *
+ * This could be moved up to a more general class so it can be used for non-leaf
+ * elements, but that would require care and for now there's no need.
+ */
+ bool GeometryDependsOnCoordCtx();
+
+ virtual bool IsMarkable();
+ virtual void GetMarkPoints(nsTArray<nsSVGMark> *aMarks);
+
+ /**
+ * A method that can be faster than using a Moz2D Path and calling GetBounds/
+ * GetStrokedBounds on it. It also helps us avoid rounding error for simple
+ * shapes and simple transforms where the Moz2D Path backends can fail to
+ * produce the clean integer bounds that content authors expect in some cases.
+ *
+ * If |aToNonScalingStrokeSpace| is non-null then |aBounds|, which is computed
+ * in bounds space, has the property that it's the smallest (axis-aligned)
+ * rectangular bound containing the image of this shape as stroked in
+ * non-scaling-stroke space. (When all transforms involved are rectilinear
+ * the bounds of the image of |aBounds| in non-scaling-stroke space will be
+ * tight, but if there are non-rectilinear transforms involved then that may
+ * be impossible and this method will return false).
+ *
+ * If |aToNonScalingStrokeSpace| is non-null then |*aToNonScalingStrokeSpace|
+ * must be non-singular.
+ */
+ virtual bool GetGeometryBounds(Rect* aBounds, const StrokeOptions& aStrokeOptions,
+ const Matrix& aToBoundsSpace,
+ const Matrix* aToNonScalingStrokeSpace = nullptr) {
+ return false;
+ }
+
+ /**
+ * For use with GetAsSimplePath.
+ */
+ class SimplePath
+ {
+ public:
+ SimplePath()
+ : mType(NONE)
+ {}
+ bool IsPath() const {
+ return mType != NONE;
+ }
+ void SetRect(Float x, Float y, Float width, Float height) {
+ mX = x; mY = y, mWidthOrX2 = width, mHeightOrY2 = height;
+ mType = RECT;
+ }
+ Rect AsRect() const {
+ MOZ_ASSERT(mType == RECT);
+ return Rect(mX, mY, mWidthOrX2, mHeightOrY2);
+ }
+ bool IsRect() const {
+ return mType == RECT;
+ }
+ void SetLine(Float x1, Float y1, Float x2, Float y2) {
+ mX = x1, mY = y1, mWidthOrX2 = x2, mHeightOrY2 = y2;
+ mType = LINE;
+ }
+ Point Point1() const {
+ MOZ_ASSERT(mType == LINE);
+ return Point(mX, mY);
+ }
+ Point Point2() const {
+ MOZ_ASSERT(mType == LINE);
+ return Point(mWidthOrX2, mHeightOrY2);
+ }
+ bool IsLine() const {
+ return mType == LINE;
+ }
+ void Reset() {
+ mType = NONE;
+ }
+ private:
+ enum Type {
+ NONE, RECT, LINE
+ };
+ Float mX, mY, mWidthOrX2, mHeightOrY2;
+ Type mType;
+ };
+
+ /**
+ * For some platforms there is significant overhead to creating and painting
+ * a Moz2D Path object. For Rects and lines it is better to get the path data
+ * using this method and then use the optimized DrawTarget methods for
+ * filling/stroking rects and lines.
+ */
+ virtual void GetAsSimplePath(SimplePath* aSimplePath) {
+ aSimplePath->Reset();
+ }
+
+ /**
+ * Returns a Path that can be used to paint, hit-test or calculate bounds for
+ * this element. May return nullptr if there is no [valid] path. The path
+ * that is created may be cached and returned on subsequent calls.
+ */
+ virtual already_AddRefed<Path> GetOrBuildPath(const DrawTarget& aDrawTarget,
+ FillRule fillRule);
+
+ /**
+ * The same as GetOrBuildPath, but bypasses the cache (neither returns any
+ * previously cached Path, nor caches the Path that in does return).
+ * this element. May return nullptr if there is no [valid] path.
+ */
+ virtual already_AddRefed<Path> BuildPath(PathBuilder* aBuilder) = 0;
+
+ /**
+ * Returns a Path that can be used to measure the length of this elements
+ * path, or to find the position at a given distance along it.
+ *
+ * This is currently equivalent to calling GetOrBuildPath, but it may not be
+ * in the future. The reason for this function to be separate from
+ * GetOrBuildPath is because SVGPathData::BuildPath inserts small lines into
+ * the path if zero length subpaths are encountered, in order to implement
+ * the SVG specifications requirements that zero length subpaths should
+ * render circles/squares if stroke-linecap is round/square, respectively.
+ * In principle these inserted lines could interfere with path measurement,
+ * so we keep callers that are looking to do measurement separate in case we
+ * run into problems with the inserted lines negatively affecting measuring
+ * for content.
+ */
+ virtual already_AddRefed<Path> GetOrBuildPathForMeasuring();
+
+ /**
+ * Returns the current computed value of the CSS property 'fill-rule' for
+ * this element.
+ */
+ FillRule GetFillRule();
+
+protected:
+ mutable RefPtr<Path> mCachedPath;
+};
+
+#endif