summaryrefslogtreecommitdiffstats
path: root/layout/svg/nsSVGClipPathFrame.h
diff options
context:
space:
mode:
Diffstat (limited to 'layout/svg/nsSVGClipPathFrame.h')
-rw-r--r--layout/svg/nsSVGClipPathFrame.h160
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