import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

layout/svg/nsSVGSwitchFrame.cpp

@@ -0,0 +1,268 @@
+/* -*- 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/. */
+
+// Keep in (case-insensitive) order:
+#include "gfxRect.h"
+#include "nsSVGEffects.h"
+#include "nsSVGGFrame.h"
+#include "mozilla/dom/SVGSwitchElement.h"
+#include "nsSVGUtils.h"
+
+using namespace mozilla::gfx;
+
+class nsSVGSwitchFrame : public nsSVGGFrame
+{
+  friend nsIFrame*
+  NS_NewSVGSwitchFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
+protected:
+  explicit nsSVGSwitchFrame(nsStyleContext* aContext)
+    : nsSVGGFrame(aContext) {}
+
+public:
+  NS_DECL_FRAMEARENA_HELPERS
+
+#ifdef DEBUG
+  virtual void Init(nsIContent*       aContent,
+                    nsContainerFrame* aParent,
+                    nsIFrame*         aPrevInFlow) override;
+#endif
+
+  /**
+   * Get the "type" of the frame
+   *
+   * @see nsGkAtoms::svgSwitchFrame
+   */
+  virtual nsIAtom* GetType() const override;
+
+#ifdef DEBUG_FRAME_DUMP
+  virtual nsresult GetFrameName(nsAString& aResult) const override
+  {
+    return MakeFrameName(NS_LITERAL_STRING("SVGSwitch"), aResult);
+  }
+#endif
+
+  virtual void BuildDisplayList(nsDisplayListBuilder*   aBuilder,
+                                const nsRect&           aDirtyRect,
+                                const nsDisplayListSet& aLists) override;
+
+  // nsISVGChildFrame interface:
+  virtual DrawResult PaintSVG(gfxContext& aContext,
+                              const gfxMatrix& aTransform,
+                              const nsIntRect* aDirtyRect = nullptr) override;
+  nsIFrame* GetFrameForPoint(const gfxPoint& aPoint) override;
+  nsRect GetCoveredRegion() override;
+  virtual void ReflowSVG() override;
+  virtual SVGBBox GetBBoxContribution(const Matrix &aToBBoxUserspace,
+                                      uint32_t aFlags) override;
+
+private:
+  nsIFrame *GetActiveChildFrame();
+};
+
+//----------------------------------------------------------------------
+// Implementation
+
+nsIFrame*
+NS_NewSVGSwitchFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
+{  
+  return new (aPresShell) nsSVGSwitchFrame(aContext);
+}
+
+NS_IMPL_FRAMEARENA_HELPERS(nsSVGSwitchFrame)
+
+#ifdef DEBUG
+void
+nsSVGSwitchFrame::Init(nsIContent*       aContent,
+                       nsContainerFrame* aParent,
+                       nsIFrame*         aPrevInFlow)
+{
+  NS_ASSERTION(aContent->IsSVGElement(nsGkAtoms::svgSwitch),
+               "Content is not an SVG switch");
+
+  nsSVGGFrame::Init(aContent, aParent, aPrevInFlow);
+}
+#endif /* DEBUG */
+
+nsIAtom *
+nsSVGSwitchFrame::GetType() const
+{
+  return nsGkAtoms::svgSwitchFrame;
+}
+
+void
+nsSVGSwitchFrame::BuildDisplayList(nsDisplayListBuilder*   aBuilder,
+                                   const nsRect&           aDirtyRect,
+                                   const nsDisplayListSet& aLists)
+{
+  nsIFrame* kid = GetActiveChildFrame();
+  if (kid) {
+    BuildDisplayListForChild(aBuilder, kid, aDirtyRect, aLists);
+  }
+}
+
+DrawResult
+nsSVGSwitchFrame::PaintSVG(gfxContext& aContext,
+                           const gfxMatrix& aTransform,
+                           const nsIntRect* aDirtyRect)
+{
+  NS_ASSERTION(!NS_SVGDisplayListPaintingEnabled() ||
+               (mState & NS_FRAME_IS_NONDISPLAY),
+               "If display lists are enabled, only painting of non-display "
+               "SVG should take this code path");
+
+  if (StyleEffects()->mOpacity == 0.0)
+    return DrawResult::SUCCESS;
+
+  DrawResult result = DrawResult::SUCCESS;
+  nsIFrame *kid = GetActiveChildFrame();
+  if (kid) {
+    gfxMatrix tm = aTransform;
+    if (kid->GetContent()->IsSVGElement()) {
+      tm = static_cast<nsSVGElement*>(kid->GetContent())->
+             PrependLocalTransformsTo(tm, eUserSpaceToParent);
+    }
+    result = nsSVGUtils::PaintFrameWithEffects(kid, aContext, tm, aDirtyRect);
+  }
+  return result;
+}
+
+
+nsIFrame*
+nsSVGSwitchFrame::GetFrameForPoint(const gfxPoint& aPoint)
+{
+  NS_ASSERTION(!NS_SVGDisplayListHitTestingEnabled() ||
+               (mState & NS_FRAME_IS_NONDISPLAY),
+               "If display lists are enabled, only hit-testing of non-display "
+               "SVG should take this code path");
+
+  nsIFrame *kid = GetActiveChildFrame();
+  nsISVGChildFrame* svgFrame = do_QueryFrame(kid);
+  if (svgFrame) {
+    // Transform the point from our SVG user space to our child's.
+    gfxPoint point = aPoint;
+    gfxMatrix m =
+      static_cast<const nsSVGElement*>(mContent)->
+        PrependLocalTransformsTo(gfxMatrix(), eChildToUserSpace);
+    m = static_cast<const nsSVGElement*>(kid->GetContent())->
+          PrependLocalTransformsTo(m, eUserSpaceToParent);
+    if (!m.IsIdentity()) {
+      if (!m.Invert()) {
+        return nullptr;
+      }
+      point = m.Transform(point);
+    }
+    return svgFrame->GetFrameForPoint(point);
+  }
+
+  return nullptr;
+}
+
+nsRect
+nsSVGSwitchFrame::GetCoveredRegion()
+{
+  nsRect rect;
+
+  nsIFrame *kid = GetActiveChildFrame();
+  nsISVGChildFrame* child = do_QueryFrame(kid);
+  if (child) {
+    rect = child->GetCoveredRegion();
+  }
+  return rect;
+}
+
+void
+nsSVGSwitchFrame::ReflowSVG()
+{
+  NS_ASSERTION(nsSVGUtils::OuterSVGIsCallingReflowSVG(this),
+               "This call is probably a wasteful mistake");
+
+  MOZ_ASSERT(!(GetStateBits() & NS_FRAME_IS_NONDISPLAY),
+             "ReflowSVG mechanism not designed for this");
+
+  if (!nsSVGUtils::NeedsReflowSVG(this)) {
+    return;
+  }
+
+  // If the NS_FRAME_FIRST_REFLOW bit has been removed from our parent frame,
+  // then our outer-<svg> has previously had its initial reflow. In that case
+  // we need to make sure that that bit has been removed from ourself _before_
+  // recursing over our children to ensure that they know too. Otherwise, we
+  // need to remove it _after_ recursing over our children so that they know
+  // the initial reflow is currently underway.
+
+  bool isFirstReflow = (mState & NS_FRAME_FIRST_REFLOW);
+
+  bool outerSVGHasHadFirstReflow =
+    (GetParent()->GetStateBits() & NS_FRAME_FIRST_REFLOW) == 0;
+
+  if (outerSVGHasHadFirstReflow) {
+    mState &= ~NS_FRAME_FIRST_REFLOW; // tell our children
+  }
+
+  nsOverflowAreas overflowRects;
+
+  nsIFrame *child = GetActiveChildFrame();
+  nsISVGChildFrame* svgChild = do_QueryFrame(child);
+  if (svgChild) {
+    MOZ_ASSERT(!(child->GetStateBits() & NS_FRAME_IS_NONDISPLAY),
+               "Check for this explicitly in the |if|, then");
+    svgChild->ReflowSVG();
+
+    // We build up our child frame overflows here instead of using
+    // nsLayoutUtils::UnionChildOverflow since SVG frame's all use the same
+    // frame list, and we're iterating over that list now anyway.
+    ConsiderChildOverflow(overflowRects, child);
+  }
+
+  if (isFirstReflow) {
+    // Make sure we have our filter property (if any) before calling
+    // FinishAndStoreOverflow (subsequent filter changes are handled off
+    // nsChangeHint_UpdateEffects):
+    nsSVGEffects::UpdateEffects(this);
+  }
+
+  FinishAndStoreOverflow(overflowRects, mRect.Size());
+
+  // Remove state bits after FinishAndStoreOverflow so that it doesn't
+  // invalidate on first reflow:
+  mState &= ~(NS_FRAME_FIRST_REFLOW | NS_FRAME_IS_DIRTY |
+              NS_FRAME_HAS_DIRTY_CHILDREN);
+}
+
+SVGBBox
+nsSVGSwitchFrame::GetBBoxContribution(const Matrix &aToBBoxUserspace,
+                                      uint32_t aFlags)
+{
+  nsIFrame* kid = GetActiveChildFrame();
+  nsISVGChildFrame* svgKid = do_QueryFrame(kid);
+  if (svgKid) {
+    nsIContent *content = kid->GetContent();
+    gfxMatrix transform = ThebesMatrix(aToBBoxUserspace);
+    if (content->IsSVGElement()) {
+      transform = static_cast<nsSVGElement*>(content)->
+                    PrependLocalTransformsTo(transform);
+    }
+    return svgKid->GetBBoxContribution(ToMatrix(transform), aFlags);
+  }
+  return SVGBBox();
+}
+
+nsIFrame *
+nsSVGSwitchFrame::GetActiveChildFrame()
+{
+  nsIContent *activeChild =
+    static_cast<mozilla::dom::SVGSwitchElement*>(mContent)->GetActiveChild();
+
+  if (activeChild) {
+    for (nsIFrame* kid = mFrames.FirstChild(); kid;
+         kid = kid->GetNextSibling()) {
+
+      if (activeChild == kid->GetContent()) {
+        return kid;
+      }
+    }
+  }
+  return nullptr;
+}