layout/svg/SVGSwitchFrame.cpp

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 // Keep in (case-insensitive) order:
   8 #include "gfxRect.h"
   9 #include "SVGGFrame.h"
  10 #include "mozilla/PresShell.h"
  11 #include "mozilla/SVGContainerFrame.h"
  12 #include "mozilla/SVGObserverUtils.h"
  13 #include "mozilla/SVGTextFrame.h"
  14 #include "mozilla/SVGUtils.h"
  15 #include "mozilla/dom/SVGSwitchElement.h"
  16
  17 using namespace mozilla::dom;
  18 using namespace mozilla::gfx;
  19 using namespace mozilla::image;
  20
  21 nsIFrame* NS_NewSVGSwitchFrame(mozilla::PresShell* aPresShell,
  22                                mozilla::ComputedStyle* aStyle);
  23
  24 namespace mozilla {
  25
  26 class SVGSwitchFrame final : public SVGGFrame {
  27   friend nsIFrame* ::NS_NewSVGSwitchFrame(mozilla::PresShell* aPresShell,
  28                                           ComputedStyle* aStyle);
  29
  30  protected:
  31   explicit SVGSwitchFrame(ComputedStyle* aStyle, nsPresContext* aPresContext)
  32       : SVGGFrame(aStyle, aPresContext, kClassID) {}
  33
  34  public:
  35   NS_DECL_FRAMEARENA_HELPERS(SVGSwitchFrame)
  36
  37 #ifdef DEBUG
  38   void Init(nsIContent* aContent, nsContainerFrame* aParent,
  39             nsIFrame* aPrevInFlow) override;
  40 #endif
  41
  42 #ifdef DEBUG_FRAME_DUMP
  43   nsresult GetFrameName(nsAString& aResult) const override {
  44     return MakeFrameName(u"SVGSwitch"_ns, aResult);
  45   }
  46 #endif
  47
  48   void BuildDisplayList(nsDisplayListBuilder* aBuilder,
  49                         const nsDisplayListSet& aLists) override;
  50
  51   // ISVGDisplayableFrame interface:
  52   void PaintSVG(gfxContext& aContext, const gfxMatrix& aTransform,
  53                 imgDrawingParams& aImgParams) override;
  54   nsIFrame* GetFrameForPoint(const gfxPoint& aPoint) override;
  55   void ReflowSVG() override;
  56   SVGBBox GetBBoxContribution(const Matrix& aToBBoxUserspace,
  57                               uint32_t aFlags) override;
  58
  59  private:
  60   nsIFrame* GetActiveChildFrame();
  61   void ReflowAllSVGTextFramesInsideNonActiveChildren(nsIFrame* aActiveChild);
  62   static void AlwaysReflowSVGTextFrameDoForOneKid(nsIFrame* aKid);
  63 };
  64
  65 }  // namespace mozilla
  66
  67 //----------------------------------------------------------------------
  68 // Implementation
  69
  70 nsIFrame* NS_NewSVGSwitchFrame(mozilla::PresShell* aPresShell,
  71                                mozilla::ComputedStyle* aStyle) {
  72   return new (aPresShell)
  73       mozilla::SVGSwitchFrame(aStyle, aPresShell->GetPresContext());
  74 }
  75
  76 namespace mozilla {
  77
  78 NS_IMPL_FRAMEARENA_HELPERS(SVGSwitchFrame)
  79
  80 #ifdef DEBUG
  81 void SVGSwitchFrame::Init(nsIContent* aContent, nsContainerFrame* aParent,
  82                           nsIFrame* aPrevInFlow) {
  83   NS_ASSERTION(aContent->IsSVGElement(nsGkAtoms::svgSwitch),
  84                "Content is not an SVG switch");
  85
  86   SVGGFrame::Init(aContent, aParent, aPrevInFlow);
  87 }
  88 #endif /* DEBUG */
  89
  90 void SVGSwitchFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
  91                                       const nsDisplayListSet& aLists) {
  92   if (auto* kid = GetActiveChildFrame()) {
  93     BuildDisplayListForChild(aBuilder, kid, aLists);
  94   }
  95 }
  96
  97 void SVGSwitchFrame::PaintSVG(gfxContext& aContext, const gfxMatrix& aTransform,
  98                               imgDrawingParams& aImgParams) {
  99   NS_ASSERTION(HasAnyStateBits(NS_FRAME_IS_NONDISPLAY),
 100                "Only painting of non-display SVG should take this code path");
 101
 102   if (StyleEffects()->IsTransparent()) {
 103     return;
 104   }
 105
 106   if (auto* kid = GetActiveChildFrame()) {
 107     gfxMatrix tm = aTransform;
 108     if (kid->GetContent()->IsSVGElement()) {
 109       tm = SVGUtils::GetTransformMatrixInUserSpace(kid) * tm;
 110     }
 111     SVGUtils::PaintFrameWithEffects(kid, aContext, tm, aImgParams);
 112   }
 113 }
 114
 115 nsIFrame* SVGSwitchFrame::GetFrameForPoint(const gfxPoint& aPoint) {
 116   MOZ_ASSERT_UNREACHABLE("A clipPath cannot contain an SVGSwitch element");
 117   return nullptr;
 118 }
 119
 120 static bool ShouldReflowSVGTextFrameInside(const nsIFrame* aFrame) {
 121   return aFrame->IsSVGContainerFrame() || aFrame->IsSVGForeignObjectFrame() ||
 122          !aFrame->IsSVGFrame();
 123 }
 124
 125 void SVGSwitchFrame::AlwaysReflowSVGTextFrameDoForOneKid(nsIFrame* aKid) {
 126   if (!aKid->IsSubtreeDirty()) {
 127     return;
 128   }
 129
 130   if (aKid->IsSVGTextFrame()) {
 131     MOZ_ASSERT(!aKid->HasAnyStateBits(NS_FRAME_IS_NONDISPLAY),
 132                "A non-display SVGTextFrame directly contained in a display "
 133                "container?");
 134     static_cast<SVGTextFrame*>(aKid)->ReflowSVG();
 135   } else if (ShouldReflowSVGTextFrameInside(aKid)) {
 136     if (!aKid->HasAnyStateBits(NS_FRAME_IS_NONDISPLAY)) {
 137       for (nsIFrame* kid : aKid->PrincipalChildList()) {
 138         AlwaysReflowSVGTextFrameDoForOneKid(kid);
 139       }
 140     } else {
 141       // This child is in a nondisplay context, something like:
 142       // <switch>
 143       //   ...
 144       //   <g><mask><text></text></mask></g>
 145       // </switch>
 146       // We should not call ReflowSVG on it.
 147       SVGContainerFrame::ReflowSVGNonDisplayText(aKid);
 148     }
 149   }
 150 }
 151
 152 void SVGSwitchFrame::ReflowAllSVGTextFramesInsideNonActiveChildren(
 153     nsIFrame* aActiveChild) {
 154   for (auto* kid : mFrames) {
 155     if (aActiveChild == kid) {
 156       continue;
 157     }
 158
 159     AlwaysReflowSVGTextFrameDoForOneKid(kid);
 160   }
 161 }
 162
 163 void SVGSwitchFrame::ReflowSVG() {
 164   NS_ASSERTION(SVGUtils::OuterSVGIsCallingReflowSVG(this),
 165                "This call is probably a wasteful mistake");
 166
 167   MOZ_ASSERT(!HasAnyStateBits(NS_FRAME_IS_NONDISPLAY),
 168              "ReflowSVG mechanism not designed for this");
 169
 170   if (!SVGUtils::NeedsReflowSVG(this)) {
 171     return;
 172   }
 173
 174   // If the NS_FRAME_FIRST_REFLOW bit has been removed from our parent frame,
 175   // then our outer-<svg> has previously had its initial reflow. In that case
 176   // we need to make sure that that bit has been removed from ourself _before_
 177   // recursing over our children to ensure that they know too. Otherwise, we
 178   // need to remove it _after_ recursing over our children so that they know
 179   // the initial reflow is currently underway.
 180
 181   bool isFirstReflow = HasAnyStateBits(NS_FRAME_FIRST_REFLOW);
 182
 183   bool outerSVGHasHadFirstReflow =
 184       !GetParent()->HasAnyStateBits(NS_FRAME_FIRST_REFLOW);
 185
 186   if (outerSVGHasHadFirstReflow) {
 187     RemoveStateBits(NS_FRAME_FIRST_REFLOW);  // tell our children
 188   }
 189
 190   OverflowAreas overflowRects;
 191
 192   auto* child = GetActiveChildFrame();
 193   ReflowAllSVGTextFramesInsideNonActiveChildren(child);
 194
 195   ISVGDisplayableFrame* svgChild = do_QueryFrame(child);
 196   if (svgChild && !child->HasAnyStateBits(NS_FRAME_IS_NONDISPLAY)) {
 197     svgChild->ReflowSVG();
 198
 199     // We build up our child frame overflows here instead of using
 200     // nsLayoutUtils::UnionChildOverflow since SVG frame's all use the same
 201     // frame list, and we're iterating over that list now anyway.
 202     ConsiderChildOverflow(overflowRects, child);
 203   } else if (child && ShouldReflowSVGTextFrameInside(child)) {
 204     MOZ_ASSERT(
 205         child->HasAnyStateBits(NS_FRAME_IS_NONDISPLAY) || !child->IsSVGFrame(),
 206         "Check for this explicitly in the |if|, then");
 207     ReflowSVGNonDisplayText(child);
 208   }
 209
 210   if (isFirstReflow) {
 211     // Make sure we have our filter property (if any) before calling
 212     // FinishAndStoreOverflow (subsequent filter changes are handled off
 213     // nsChangeHint_UpdateEffects):
 214     SVGObserverUtils::UpdateEffects(this);
 215   }
 216
 217   FinishAndStoreOverflow(overflowRects, mRect.Size());
 218
 219   // Remove state bits after FinishAndStoreOverflow so that it doesn't
 220   // invalidate on first reflow:
 221   RemoveStateBits(NS_FRAME_FIRST_REFLOW | NS_FRAME_IS_DIRTY |
 222                   NS_FRAME_HAS_DIRTY_CHILDREN);
 223 }
 224
 225 SVGBBox SVGSwitchFrame::GetBBoxContribution(const Matrix& aToBBoxUserspace,
 226                                             uint32_t aFlags) {
 227   auto* kid = GetActiveChildFrame();
 228   if (ISVGDisplayableFrame* svgKid = do_QueryFrame(kid)) {
 229     nsIContent* content = kid->GetContent();
 230     gfxMatrix transform = ThebesMatrix(aToBBoxUserspace);
 231     if (content->IsSVGElement()) {
 232       transform = static_cast<SVGElement*>(content)->PrependLocalTransformsTo(
 233                       {}, eChildToUserSpace) *
 234                   SVGUtils::GetTransformMatrixInUserSpace(kid) * transform;
 235     }
 236     return svgKid->GetBBoxContribution(ToMatrix(transform), aFlags);
 237   }
 238   return SVGBBox();
 239 }
 240
 241 nsIFrame* SVGSwitchFrame::GetActiveChildFrame() {
 242   auto* activeChild =
 243       static_cast<dom::SVGSwitchElement*>(GetContent())->GetActiveChild();
 244
 245   return activeChild ? activeChild->GetPrimaryFrame() : nullptr;
 246 }
 247
 248 }  // namespace mozilla