Add m-esr52 at 52.6.0

1 files changed, 160 insertions, 0 deletions

diff --git a/layout/svg/nsSVGClipPathFrame.h b/layout/svg/nsSVGClipPathFrame.h
new file mode 100644
index 000000000..42a8d16ff
--- /dev/null
+++ b/layout/svg/nsSVGClipPathFrame.h
@@ -0,0 +1,160 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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_SVGCLIPPATHFRAME_H__
+#define __NS_SVGCLIPPATHFRAME_H__
+
+#include "AutoReferenceLimiter.h"
+#include "gfxMatrix.h"
+#include "mozilla/Attributes.h"
+#include "nsSVGContainerFrame.h"
+#include "nsSVGUtils.h"
+
+class gfxContext;
+class nsISVGChildFrame;
+
+class nsSVGClipPathFrame : public nsSVGContainerFrame
+{
+  friend nsIFrame*
+  NS_NewSVGClipPathFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
+
+  typedef mozilla::gfx::Matrix Matrix;
+  typedef mozilla::gfx::SourceSurface SourceSurface;
+  typedef mozilla::image::DrawResult DrawResult;
+
+protected:
+  explicit nsSVGClipPathFrame(nsStyleContext* aContext)
+    : nsSVGContainerFrame(aContext)
+    , mReferencing(mozilla::AutoReferenceLimiter::notReferencing)
+  {
+    AddStateBits(NS_FRAME_IS_NONDISPLAY);
+  }
+
+public:
+  NS_DECL_FRAMEARENA_HELPERS
+
+  // nsIFrame methods:
+  virtual void BuildDisplayList(nsDisplayListBuilder*   aBuilder,
+                                const nsRect&           aDirtyRect,
+                                const nsDisplayListSet& aLists) override {}
+
+  // nsSVGClipPathFrame methods:
+
+  /**
+   * Applies the clipPath by pushing a clip path onto the DrawTarget.
+   *
+   * This method must only be used if IsTrivial() returns true, otherwise use
+   * GetClipMask.
+   *
+   * @param aContext The context that the clip path is to be applied to.
+   * @param aClippedFrame The/an nsIFrame of the element that references this
+   *   clipPath that is currently being processed.
+   * @param aMatrix The transform from aClippedFrame's user space to aContext's
+   *   current transform.
+   */
+  void ApplyClipPath(gfxContext& aContext,
+                     nsIFrame* aClippedFrame,
+                     const gfxMatrix &aMatrix);
+
+  /**
+   * Returns an alpha mask surface containing the clipping geometry.
+   *
+   * This method must only be used if IsTrivial() returns false, otherwise use
+   * ApplyClipPath.
+   *
+   * @param aReferenceContext Used to determine the backend for and size of the
+   *   returned SourceSurface, the size being limited to the device space clip
+   *   extents on the context.
+   * @param aClippedFrame The/an nsIFrame of the element that references this
+   *   clipPath that is currently being processed.
+   * @param aMatrix The transform from aClippedFrame's user space to aContext's
+   *   current transform.
+   * @param [out] aMaskTransform The transform to use with the returned
+   *   surface.
+   * @param [in, optional] aExtraMask An extra surface that the returned
+   *   surface should be masked with.
+   * @param [in, optional] aExtraMasksTransform The transform to use with
+   *   aExtraMask. Should be passed when aExtraMask is passed.
+   * @param [out, optional] aResult returns the result of drawing action.
+   */
+  already_AddRefed<SourceSurface>
+    GetClipMask(gfxContext& aReferenceContext, nsIFrame* aClippedFrame,
+                const gfxMatrix& aMatrix, Matrix* aMaskTransform,
+                SourceSurface* aExtraMask = nullptr,
+                const Matrix& aExtraMasksTransform = Matrix(),
+                DrawResult* aResult = nullptr);
+
+  /**
+   * aPoint is expected to be in aClippedFrame's SVG user space.
+   */
+  bool PointIsInsideClipPath(nsIFrame* aClippedFrame, const gfxPoint &aPoint);
+
+  // Check if this clipPath is made up of more than one geometry object.
+  // If so, the clipping API in cairo isn't enough and we need to use
+  // mask based clipping.
+  bool IsTrivial(nsISVGChildFrame **aSingleChild = nullptr);
+
+  bool IsValid();
+
+  // nsIFrame interface:
+  virtual nsresult AttributeChanged(int32_t         aNameSpaceID,
+                                    nsIAtom*        aAttribute,
+                                    int32_t         aModType) override;
+
+  virtual void Init(nsIContent*       aContent,
+                    nsContainerFrame* aParent,
+                    nsIFrame*         aPrevInFlow) override;
+
+  /**
+   * Get the "type" of the frame
+   *
+   * @see nsGkAtoms::svgClipPathFrame
+   */
+  virtual nsIAtom* GetType() const override;
+
+#ifdef DEBUG_FRAME_DUMP
+  virtual nsresult GetFrameName(nsAString& aResult) const override
+  {
+    return MakeFrameName(NS_LITERAL_STRING("SVGClipPath"), aResult);
+  }
+#endif
+
+  SVGBBox 
+  GetBBoxForClipPathFrame(const SVGBBox &aBBox, const gfxMatrix &aMatrix);
+
+  /**
+   * If the clipPath element transforms its children due to
+   * clipPathUnits="objectBoundingBox" being set on it and/or due to the
+   * 'transform' attribute being set on it, this function returns the resulting
+   * transform.
+   */
+  gfxMatrix GetClipPathTransform(nsIFrame* aClippedFrame);
+
+private:
+
+  // nsSVGContainerFrame methods:
+  virtual gfxMatrix GetCanvasTM() override;
+
+  // Set, during a GetClipMask() call, to the transform that still needs to be
+  // concatenated to the transform of the DrawTarget that was passed to
+  // GetClipMask in order to establish the coordinate space that the clipPath
+  // establishes for its contents (i.e. including applying 'clipPathUnits' and
+  // any 'transform' attribute set on the clipPath) specifically for clipping
+  // the frame that was passed to GetClipMask at that moment in time.  This is
+  // set so that if our GetCanvasTM method is called while GetClipMask is
+  // painting its children, the returned matrix will include the transforms
+  // that should be used when creating the mask for the frame passed to
+  // GetClipMask.
+  //
+  // Note: The removal of GetCanvasTM is nearly complete, so our GetCanvasTM
+  // may not even be called soon/any more.
+  gfxMatrix mMatrixForChildren;
+
+  // Flag used by AutoReferenceLimiter while we're processing an instance of
+  // this class to protect against (break) reference loops.
+  int16_t mReferencing;
+};
+
+#endif