1 files changed, 131 insertions, 0 deletions
diff --git a/layout/svg/nsSVGMaskFrame.h b/layout/svg/nsSVGMaskFrame.h
new file mode 100644
index 000000000..380306a48
--- /dev/null
+++ b/layout/svg/nsSVGMaskFrame.h
@@ -0,0 +1,131 @@
+/* -*- 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_SVGMASKFRAME_H__
+#define __NS_SVGMASKFRAME_H__
+
+#include "mozilla/Attributes.h"
+#include "mozilla/gfx/2D.h"
+#include "mozilla/RefPtr.h"
+#include "gfxPattern.h"
+#include "gfxMatrix.h"
+#include "nsSVGContainerFrame.h"
+#include "nsSVGUtils.h"
+
+class gfxContext;
+
+/**
+ * Byte offsets of channels in a native packed gfxColor or cairo image surface.
+ */
+#ifdef IS_BIG_ENDIAN
+#define GFX_ARGB32_OFFSET_A 0
+#define GFX_ARGB32_OFFSET_R 1
+#define GFX_ARGB32_OFFSET_G 2
+#define GFX_ARGB32_OFFSET_B 3
+#else
+#define GFX_ARGB32_OFFSET_A 3
+#define GFX_ARGB32_OFFSET_R 2
+#define GFX_ARGB32_OFFSET_G 1
+#define GFX_ARGB32_OFFSET_B 0
+#endif
+
+class nsSVGMaskFrame final : public nsSVGContainerFrame
+{
+  friend nsIFrame*
+  NS_NewSVGMaskFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
+
+  typedef mozilla::gfx::Matrix Matrix;
+  typedef mozilla::gfx::SourceSurface SourceSurface;
+
+protected:
+  explicit nsSVGMaskFrame(nsStyleContext* aContext)
+    : nsSVGContainerFrame(aContext)
+    , mInUse(false)
+  {
+    AddStateBits(NS_FRAME_IS_NONDISPLAY);
+  }
+
+public:
+  NS_DECL_FRAMEARENA_HELPERS
+
+  // nsSVGMaskFrame method:
+  already_AddRefed<SourceSurface>
+  GetMaskForMaskedFrame(gfxContext* aContext,
+                        nsIFrame* aMaskedFrame,
+                        const gfxMatrix &aMatrix,
+                        float aOpacity,
+                        Matrix* aMaskTransform,
+                        uint8_t aMaskOp = NS_STYLE_MASK_MODE_MATCH_SOURCE);
+
+  gfxRect
+  GetMaskArea(nsIFrame* aMaskedFrame);
+
+  virtual nsresult AttributeChanged(int32_t         aNameSpaceID,
+                                    nsIAtom*        aAttribute,
+                                    int32_t         aModType) override;
+
+#ifdef DEBUG
+  virtual void Init(nsIContent*       aContent,
+                    nsContainerFrame* aParent,
+                    nsIFrame*         aPrevInFlow) override;
+#endif
+
+  virtual void BuildDisplayList(nsDisplayListBuilder*   aBuilder,
+                                const nsRect&           aDirtyRect,
+                                const nsDisplayListSet& aLists) override {}
+
+  /**
+   * Get the "type" of the frame
+   *
+   * @see nsGkAtoms::svgMaskFrame
+   */
+  virtual nsIAtom* GetType() const override;
+
+#ifdef DEBUG_FRAME_DUMP
+  virtual nsresult GetFrameName(nsAString& aResult) const override
+  {
+    return MakeFrameName(NS_LITERAL_STRING("SVGMask"), aResult);
+  }
+#endif
+
+private:
+  /**
+   * If the mask element transforms its children due to
+   * maskContentUnits="objectBoundingBox" being set on it, this function
+   * returns the resulting transform.
+   */
+  gfxMatrix GetMaskTransform(nsIFrame* aMaskedFrame);
+
+  // A helper class to allow us to paint masks safely. The helper
+  // automatically sets and clears the mInUse flag on the mask frame
+  // (to prevent nasty reference loops). It's easy to mess this up
+  // and break things, so this helper makes the code far more robust.
+  class MOZ_RAII AutoMaskReferencer
+  {
+  public:
+    explicit AutoMaskReferencer(nsSVGMaskFrame *aFrame
+                                MOZ_GUARD_OBJECT_NOTIFIER_PARAM)
+       : mFrame(aFrame) {
+      MOZ_GUARD_OBJECT_NOTIFIER_INIT;
+      NS_ASSERTION(!mFrame->mInUse, "reference loop!");
+      mFrame->mInUse = true;
+    }
+    ~AutoMaskReferencer() {
+      mFrame->mInUse = false;
+    }
+  private:
+    nsSVGMaskFrame *mFrame;
+    MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
+  };
+
+  gfxMatrix mMatrixForChildren;
+  // recursion prevention flag
+  bool mInUse;
+
+  // nsSVGContainerFrame methods:
+  virtual gfxMatrix GetCanvasTM() override;
+};
+
+#endif