1 files changed, 188 insertions, 0 deletions
diff --git a/layout/svg/SVGMaskFrame.cpp b/layout/svg/SVGMaskFrame.cpp
new file mode 100644
index 0000000000..6447b148ff
--- /dev/null
+++ b/layout/svg/SVGMaskFrame.cpp
@@ -0,0 +1,188 @@
+/* -*- 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/. */
+
+// Main header first:
+#include "SVGMaskFrame.h"
+
+// Keep others in (case-insensitive) order:
+#include "AutoReferenceChainGuard.h"
+#include "gfx2DGlue.h"
+#include "gfxContext.h"
+#include "mozilla/PresShell.h"
+#include "mozilla/RefPtr.h"
+#include "mozilla/SVGObserverUtils.h"
+#include "mozilla/SVGUtils.h"
+#include "mozilla/dom/SVGMaskElement.h"
+#include "mozilla/dom/SVGUnitTypesBinding.h"
+#include "mozilla/gfx/2D.h"
+
+using namespace mozilla::dom;
+using namespace mozilla::dom::SVGUnitTypes_Binding;
+using namespace mozilla::gfx;
+using namespace mozilla::image;
+
+nsIFrame* NS_NewSVGMaskFrame(mozilla::PresShell* aPresShell,
+                             mozilla::ComputedStyle* aStyle) {
+  return new (aPresShell)
+      mozilla::SVGMaskFrame(aStyle, aPresShell->GetPresContext());
+}
+
+namespace mozilla {
+
+NS_IMPL_FRAMEARENA_HELPERS(SVGMaskFrame)
+
+already_AddRefed<SourceSurface> SVGMaskFrame::GetMaskForMaskedFrame(
+    MaskParams& aParams) {
+  // Make sure we break reference loops and over long reference chains:
+  static int16_t sRefChainLengthCounter = AutoReferenceChainGuard::noChain;
+  AutoReferenceChainGuard refChainGuard(this, &mInUse, &sRefChainLengthCounter);
+  if (MOZ_UNLIKELY(!refChainGuard.Reference())) {
+    // Break reference chain
+    return nullptr;
+  }
+
+  gfxRect maskArea = GetMaskArea(aParams.maskedFrame);
+  if (maskArea.IsEmpty()) {
+    return nullptr;
+  }
+  // Get the clip extents in device space:
+  // Minimizing the mask surface extents (using both the current clip extents
+  // and maskArea) is important for performance.
+  //
+  gfxRect maskSurfaceRectDouble = aParams.toUserSpace.TransformBounds(maskArea);
+  Rect maskSurfaceRect = ToRect(maskSurfaceRectDouble);
+  maskSurfaceRect.RoundOut();
+
+  StyleMaskType maskType;
+  if (aParams.maskMode == StyleMaskMode::MatchSource) {
+    maskType = StyleSVGReset()->mMaskType;
+  } else {
+    maskType = aParams.maskMode == StyleMaskMode::Luminance
+                   ? StyleMaskType::Luminance
+                   : StyleMaskType::Alpha;
+  }
+
+  RefPtr<DrawTarget> maskDT;
+  if (maskType == StyleMaskType::Luminance) {
+    maskDT = aParams.dt->CreateClippedDrawTarget(maskSurfaceRect,
+                                                 SurfaceFormat::B8G8R8A8);
+  } else {
+    maskDT =
+        aParams.dt->CreateClippedDrawTarget(maskSurfaceRect, SurfaceFormat::A8);
+  }
+
+  if (!maskDT || !maskDT->IsValid()) {
+    return nullptr;
+  }
+
+  gfxContext tmpCtx(maskDT, /* aPreserveTransform */ true);
+
+  mMatrixForChildren =
+      GetMaskTransform(aParams.maskedFrame) * aParams.toUserSpace;
+
+  for (auto* kid : mFrames) {
+    gfxMatrix m = mMatrixForChildren;
+
+    // The CTM of each frame referencing us can be different
+    ISVGDisplayableFrame* SVGFrame = do_QueryFrame(kid);
+    if (SVGFrame) {
+      SVGFrame->NotifySVGChanged(ISVGDisplayableFrame::TRANSFORM_CHANGED);
+      m = SVGUtils::GetTransformMatrixInUserSpace(kid) * m;
+    }
+
+    SVGUtils::PaintFrameWithEffects(kid, tmpCtx, m, aParams.imgParams);
+  }
+
+  RefPtr<SourceSurface> surface;
+  if (maskType == StyleMaskType::Luminance) {
+    auto luminanceType = LuminanceType::LUMINANCE;
+    if (StyleSVG()->mColorInterpolation == StyleColorInterpolation::Linearrgb) {
+      luminanceType = LuminanceType::LINEARRGB;
+    }
+
+    RefPtr<SourceSurface> maskSnapshot =
+        maskDT->IntoLuminanceSource(luminanceType, aParams.opacity);
+    if (!maskSnapshot) {
+      return nullptr;
+    }
+    surface = std::move(maskSnapshot);
+  } else {
+    maskDT->FillRect(maskSurfaceRect,
+                     ColorPattern(DeviceColor::MaskWhite(aParams.opacity)),
+                     DrawOptions(1, CompositionOp::OP_IN));
+    RefPtr<SourceSurface> maskSnapshot = maskDT->Snapshot();
+    if (!maskSnapshot) {
+      return nullptr;
+    }
+    surface = std::move(maskSnapshot);
+  }
+
+  return surface.forget();
+}
+
+gfxRect SVGMaskFrame::GetMaskArea(nsIFrame* aMaskedFrame) {
+  SVGMaskElement* maskElem = static_cast<SVGMaskElement*>(GetContent());
+
+  uint16_t units =
+      maskElem->mEnumAttributes[SVGMaskElement::MASKUNITS].GetAnimValue();
+  gfxRect bbox;
+  if (units == SVG_UNIT_TYPE_OBJECTBOUNDINGBOX) {
+    bbox =
+        SVGUtils::GetBBox(aMaskedFrame, SVGUtils::eUseFrameBoundsForOuterSVG |
+                                            SVGUtils::eBBoxIncludeFillGeometry);
+  }
+
+  // Bounds in the user space of aMaskedFrame
+  gfxRect maskArea = SVGUtils::GetRelativeRect(
+      units, &maskElem->mLengthAttributes[SVGMaskElement::ATTR_X], bbox,
+      aMaskedFrame);
+
+  return maskArea;
+}
+
+nsresult SVGMaskFrame::AttributeChanged(int32_t aNameSpaceID,
+                                        nsAtom* aAttribute, int32_t aModType) {
+  if (aNameSpaceID == kNameSpaceID_None &&
+      (aAttribute == nsGkAtoms::x || aAttribute == nsGkAtoms::y ||
+       aAttribute == nsGkAtoms::width || aAttribute == nsGkAtoms::height ||
+       aAttribute == nsGkAtoms::maskUnits ||
+       aAttribute == nsGkAtoms::maskContentUnits)) {
+    SVGObserverUtils::InvalidateRenderingObservers(this);
+  }
+
+  return SVGContainerFrame::AttributeChanged(aNameSpaceID, aAttribute,
+                                             aModType);
+}
+
+#ifdef DEBUG
+void SVGMaskFrame::Init(nsIContent* aContent, nsContainerFrame* aParent,
+                        nsIFrame* aPrevInFlow) {
+  NS_ASSERTION(aContent->IsSVGElement(nsGkAtoms::mask),
+               "Content is not an SVG mask");
+
+  SVGContainerFrame::Init(aContent, aParent, aPrevInFlow);
+}
+#endif /* DEBUG */
+
+gfxMatrix SVGMaskFrame::GetCanvasTM() { return mMatrixForChildren; }
+
+gfxMatrix SVGMaskFrame::GetMaskTransform(nsIFrame* aMaskedFrame) {
+  SVGMaskElement* content = static_cast<SVGMaskElement*>(GetContent());
+
+  SVGAnimatedEnumeration* maskContentUnits =
+      &content->mEnumAttributes[SVGMaskElement::MASKCONTENTUNITS];
+
+  uint32_t flags = SVGUtils::eBBoxIncludeFillGeometry |
+                   (aMaskedFrame->StyleBorder()->mBoxDecorationBreak ==
+                            StyleBoxDecorationBreak::Clone
+                        ? SVGUtils::eIncludeOnlyCurrentFrameForNonSVGElement
+                        : 0);
+
+  return SVGUtils::AdjustMatrixForUnits(gfxMatrix(), maskContentUnits,
+                                        aMaskedFrame, flags);
+}
+
+}  // namespace mozilla