1 files changed, 111 insertions, 0 deletions
diff --git a/layout/svg/SVGMaskFrame.h b/layout/svg/SVGMaskFrame.h
new file mode 100644
index 0000000000..ee97415459
--- /dev/null
+++ b/layout/svg/SVGMaskFrame.h
@@ -0,0 +1,111 @@
+/* -*- 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 LAYOUT_SVG_SVGMASKFRAME_H_
+#define LAYOUT_SVG_SVGMASKFRAME_H_
+
+#include "mozilla/Attributes.h"
+#include "mozilla/RefPtr.h"
+#include "mozilla/SVGContainerFrame.h"
+#include "mozilla/gfx/2D.h"
+#include "gfxPattern.h"
+#include "gfxMatrix.h"
+
+class gfxContext;
+
+namespace mozilla {
+class PresShell;
+}  // namespace mozilla
+
+nsIFrame* NS_NewSVGMaskFrame(mozilla::PresShell* aPresShell,
+                             mozilla::ComputedStyle* aStyle);
+
+namespace mozilla {
+
+class SVGMaskFrame final : public SVGContainerFrame {
+  friend nsIFrame* ::NS_NewSVGMaskFrame(mozilla::PresShell* aPresShell,
+                                        ComputedStyle* aStyle);
+
+  using Matrix = gfx::Matrix;
+  using SourceSurface = gfx::SourceSurface;
+  using imgDrawingParams = image::imgDrawingParams;
+
+ protected:
+  explicit SVGMaskFrame(ComputedStyle* aStyle, nsPresContext* aPresContext)
+      : SVGContainerFrame(aStyle, aPresContext, kClassID), mInUse(false) {
+    AddStateBits(NS_FRAME_IS_NONDISPLAY);
+  }
+
+ public:
+  NS_DECL_FRAMEARENA_HELPERS(SVGMaskFrame)
+
+  struct MaskParams {
+    gfx::DrawTarget* dt;
+    nsIFrame* maskedFrame;
+    const gfxMatrix& toUserSpace;
+    float opacity;
+    StyleMaskMode maskMode;
+    imgDrawingParams& imgParams;
+
+    explicit MaskParams(gfx::DrawTarget* aDt, nsIFrame* aMaskedFrame,
+                        const gfxMatrix& aToUserSpace, float aOpacity,
+                        StyleMaskMode aMaskMode, imgDrawingParams& aImgParams)
+        : dt(aDt),
+          maskedFrame(aMaskedFrame),
+          toUserSpace(aToUserSpace),
+          opacity(aOpacity),
+          maskMode(aMaskMode),
+          imgParams(aImgParams) {}
+  };
+
+  // SVGMaskFrame method:
+
+  /**
+   * Generate a mask surface for the target frame.
+   *
+   * The return surface can be null, it's the caller's responsibility to
+   * null-check before dereferencing.
+   */
+  already_AddRefed<SourceSurface> GetMaskForMaskedFrame(MaskParams& aParams);
+
+  gfxRect GetMaskArea(nsIFrame* aMaskedFrame);
+
+  nsresult AttributeChanged(int32_t aNameSpaceID, nsAtom* aAttribute,
+                            int32_t aModType) override;
+
+#ifdef DEBUG
+  void Init(nsIContent* aContent, nsContainerFrame* aParent,
+            nsIFrame* aPrevInFlow) override;
+#endif
+
+  void BuildDisplayList(nsDisplayListBuilder* aBuilder,
+                        const nsDisplayListSet& aLists) override {}
+
+#ifdef DEBUG_FRAME_DUMP
+  nsresult GetFrameName(nsAString& aResult) const override {
+    return MakeFrameName(u"SVGMask"_ns, 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);
+
+  gfxMatrix mMatrixForChildren;
+  // recursion prevention flag
+  bool mInUse;
+
+  // SVGContainerFrame methods:
+  gfxMatrix GetCanvasTM() override;
+};
+
+}  // namespace mozilla
+
+#endif  // LAYOUT_SVG_SVGMASKFRAME_H_