Adding upstream version 86.0.1.upstream/86.0.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 879 insertions, 0 deletions

diff --git a/layout/generic/nsImageMap.cpp b/layout/generic/nsImageMap.cpp
new file mode 100644
index 0000000000..0dddeb1e5d
--- /dev/null
+++ b/layout/generic/nsImageMap.cpp
@@ -0,0 +1,879 @@
+/* -*- 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/. */
+
+/* code for HTML client-side image maps */
+
+#include "nsImageMap.h"
+
+#include "mozilla/dom/Element.h"
+#include "mozilla/dom/Event.h"  // for Event
+#include "mozilla/dom/HTMLAreaElement.h"
+#include "mozilla/gfx/PathHelpers.h"
+#include "mozilla/UniquePtr.h"
+#include "nsString.h"
+#include "nsReadableUtils.h"
+#include "nsPresContext.h"
+#include "nsNameSpaceManager.h"
+#include "nsGkAtoms.h"
+#include "nsImageFrame.h"
+#include "nsCoord.h"
+#include "nsIContentInlines.h"
+#include "nsIScriptError.h"
+#include "nsContentUtils.h"
+#include "ImageLayers.h"
+
+#ifdef ACCESSIBILITY
+#  include "nsAccessibilityService.h"
+#endif
+
+using namespace mozilla;
+using namespace mozilla::gfx;
+using namespace mozilla::dom;
+
+class Area {
+ public:
+  explicit Area(HTMLAreaElement* aArea);
+  virtual ~Area();
+
+  virtual void ParseCoords(const nsAString& aSpec);
+
+  virtual bool IsInside(nscoord x, nscoord y) const = 0;
+  virtual void Draw(nsIFrame* aFrame, DrawTarget& aDrawTarget,
+                    const ColorPattern& aColor,
+                    const StrokeOptions& aStrokeOptions) = 0;
+  virtual void GetRect(nsIFrame* aFrame, nsRect& aRect) = 0;
+
+  void HasFocus(bool aHasFocus);
+
+  RefPtr<HTMLAreaElement> mArea;
+  UniquePtr<nscoord[]> mCoords;
+  int32_t mNumCoords;
+  bool mHasFocus;
+};
+
+Area::Area(HTMLAreaElement* aArea) : mArea(aArea) {
+  MOZ_COUNT_CTOR(Area);
+  MOZ_ASSERT(mArea, "How did that happen?");
+  mNumCoords = 0;
+  mHasFocus = false;
+}
+
+Area::~Area() { MOZ_COUNT_DTOR(Area); }
+
+#include <stdlib.h>
+
+inline bool is_space(char c) {
+  return (c == ' ' || c == '\f' || c == '\n' || c == '\r' || c == '\t' ||
+          c == '\v');
+}
+
+static void logMessage(nsIContent* aContent, const nsAString& aCoordsSpec,
+                       int32_t aFlags, const char* aMessageName) {
+  nsContentUtils::ReportToConsole(
+      aFlags, "Layout: ImageMap"_ns, aContent->OwnerDoc(),
+      nsContentUtils::eLAYOUT_PROPERTIES, aMessageName,
+      nsTArray<nsString>(), /* params */
+      nullptr,
+      PromiseFlatString(u"coords=\""_ns + aCoordsSpec +
+                        u"\""_ns)); /* source line */
+}
+
+void Area::ParseCoords(const nsAString& aSpec) {
+  char* cp = ToNewUTF8String(aSpec);
+  if (cp) {
+    char* tptr;
+    char* n_str;
+    int32_t i, cnt;
+
+    /*
+     * Nothing in an empty list
+     */
+    mNumCoords = 0;
+    mCoords = nullptr;
+    if (*cp == '\0') {
+      free(cp);
+      return;
+    }
+
+    /*
+     * Skip beginning whitespace, all whitespace is empty list.
+     */
+    n_str = cp;
+    while (is_space(*n_str)) {
+      n_str++;
+    }
+    if (*n_str == '\0') {
+      free(cp);
+      return;
+    }
+
+    /*
+     * Make a pass where any two numbers separated by just whitespace
+     * are given a comma separator.  Count entries while passing.
+     */
+    cnt = 0;
+    while (*n_str != '\0') {
+      bool has_comma;
+
+      /*
+       * Skip to a separator
+       */
+      tptr = n_str;
+      while (!is_space(*tptr) && *tptr != ',' && *tptr != '\0') {
+        tptr++;
+      }
+      n_str = tptr;
+
+      /*
+       * If no more entries, break out here
+       */
+      if (*n_str == '\0') {
+        break;
+      }
+
+      /*
+       * Skip to the end of the separator, noting if we have a
+       * comma.
+       */
+      has_comma = false;
+      while (is_space(*tptr) || *tptr == ',') {
+        if (*tptr == ',') {
+          if (!has_comma) {
+            has_comma = true;
+          } else {
+            break;
+          }
+        }
+        tptr++;
+      }
+      /*
+       * If this was trailing whitespace we skipped, we are done.
+       */
+      if ((*tptr == '\0') && !has_comma) {
+        break;
+      }
+      /*
+       * Else if the separator is all whitespace, and this is not the
+       * end of the string, add a comma to the separator.
+       */
+      else if (!has_comma) {
+        *n_str = ',';
+      }
+
+      /*
+       * count the entry skipped.
+       */
+      cnt++;
+
+      n_str = tptr;
+    }
+    /*
+     * count the last entry in the list.
+     */
+    cnt++;
+
+    /*
+     * Allocate space for the coordinate array.
+     */
+    UniquePtr<nscoord[]> value_list = MakeUnique<nscoord[]>(cnt);
+    if (!value_list) {
+      free(cp);
+      return;
+    }
+
+    /*
+     * Second pass to copy integer values into list.
+     */
+    tptr = cp;
+    for (i = 0; i < cnt; i++) {
+      char* ptr;
+
+      ptr = strchr(tptr, ',');
+      if (ptr) {
+        *ptr = '\0';
+      }
+      /*
+       * Strip whitespace in front of number because I don't
+       * trust atoi to do it on all platforms.
+       */
+      while (is_space(*tptr)) {
+        tptr++;
+      }
+      if (*tptr == '\0') {
+        value_list[i] = 0;
+      } else {
+        value_list[i] = (nscoord)::atoi(tptr);
+      }
+      if (ptr) {
+        *ptr = ',';
+        tptr = ptr + 1;
+      }
+    }
+
+    mNumCoords = cnt;
+    mCoords = std::move(value_list);
+
+    free(cp);
+  }
+}
+
+void Area::HasFocus(bool aHasFocus) { mHasFocus = aHasFocus; }
+
+//----------------------------------------------------------------------
+
+class DefaultArea final : public Area {
+ public:
+  explicit DefaultArea(HTMLAreaElement* aArea);
+
+  virtual bool IsInside(nscoord x, nscoord y) const override;
+  virtual void Draw(nsIFrame* aFrame, DrawTarget& aDrawTarget,
+                    const ColorPattern& aColor,
+                    const StrokeOptions& aStrokeOptions) override;
+  virtual void GetRect(nsIFrame* aFrame, nsRect& aRect) override;
+};
+
+DefaultArea::DefaultArea(HTMLAreaElement* aArea) : Area(aArea) {}
+
+bool DefaultArea::IsInside(nscoord x, nscoord y) const { return true; }
+
+void DefaultArea::Draw(nsIFrame* aFrame, DrawTarget& aDrawTarget,
+                       const ColorPattern& aColor,
+                       const StrokeOptions& aStrokeOptions) {
+  if (mHasFocus) {
+    nsRect r(nsPoint(0, 0), aFrame->GetSize());
+    const nscoord kOnePixel = nsPresContext::CSSPixelsToAppUnits(1);
+    r.width -= kOnePixel;
+    r.height -= kOnePixel;
+    Rect rect = ToRect(nsLayoutUtils::RectToGfxRect(
+        r, aFrame->PresContext()->AppUnitsPerDevPixel()));
+    StrokeSnappedEdgesOfRect(rect, aDrawTarget, aColor, aStrokeOptions);
+  }
+}
+
+void DefaultArea::GetRect(nsIFrame* aFrame, nsRect& aRect) {
+  aRect = aFrame->GetRect();
+  aRect.MoveTo(0, 0);
+}
+
+//----------------------------------------------------------------------
+
+class RectArea final : public Area {
+ public:
+  explicit RectArea(HTMLAreaElement* aArea);
+
+  virtual void ParseCoords(const nsAString& aSpec) override;
+  virtual bool IsInside(nscoord x, nscoord y) const override;
+  virtual void Draw(nsIFrame* aFrame, DrawTarget& aDrawTarget,
+                    const ColorPattern& aColor,
+                    const StrokeOptions& aStrokeOptions) override;
+  virtual void GetRect(nsIFrame* aFrame, nsRect& aRect) override;
+};
+
+RectArea::RectArea(HTMLAreaElement* aArea) : Area(aArea) {}
+
+void RectArea::ParseCoords(const nsAString& aSpec) {
+  Area::ParseCoords(aSpec);
+
+  bool saneRect = true;
+  int32_t flag = nsIScriptError::warningFlag;
+  if (mNumCoords >= 4) {
+    if (mCoords[0] > mCoords[2]) {
+      // x-coords in reversed order
+      nscoord x = mCoords[2];
+      mCoords[2] = mCoords[0];
+      mCoords[0] = x;
+      saneRect = false;
+    }
+
+    if (mCoords[1] > mCoords[3]) {
+      // y-coords in reversed order
+      nscoord y = mCoords[3];
+      mCoords[3] = mCoords[1];
+      mCoords[1] = y;
+      saneRect = false;
+    }
+
+    if (mNumCoords > 4) {
+      // Someone missed the concept of a rect here
+      saneRect = false;
+    }
+  } else {
+    saneRect = false;
+    flag = nsIScriptError::errorFlag;
+  }
+
+  if (!saneRect) {
+    logMessage(mArea, aSpec, flag, "ImageMapRectBoundsError");
+  }
+}
+
+bool RectArea::IsInside(nscoord x, nscoord y) const {
+  if (mNumCoords >= 4) {  // Note: > is for nav compatibility
+    nscoord x1 = mCoords[0];
+    nscoord y1 = mCoords[1];
+    nscoord x2 = mCoords[2];
+    nscoord y2 = mCoords[3];
+    NS_ASSERTION(x1 <= x2 && y1 <= y2,
+                 "Someone screwed up RectArea::ParseCoords");
+    if ((x >= x1) && (x <= x2) && (y >= y1) && (y <= y2)) {
+      return true;
+    }
+  }
+  return false;
+}
+
+void RectArea::Draw(nsIFrame* aFrame, DrawTarget& aDrawTarget,
+                    const ColorPattern& aColor,
+                    const StrokeOptions& aStrokeOptions) {
+  if (mHasFocus) {
+    if (mNumCoords >= 4) {
+      nscoord x1 = nsPresContext::CSSPixelsToAppUnits(mCoords[0]);
+      nscoord y1 = nsPresContext::CSSPixelsToAppUnits(mCoords[1]);
+      nscoord x2 = nsPresContext::CSSPixelsToAppUnits(mCoords[2]);
+      nscoord y2 = nsPresContext::CSSPixelsToAppUnits(mCoords[3]);
+      NS_ASSERTION(x1 <= x2 && y1 <= y2,
+                   "Someone screwed up RectArea::ParseCoords");
+      nsRect r(x1, y1, x2 - x1, y2 - y1);
+      Rect rect = ToRect(nsLayoutUtils::RectToGfxRect(
+          r, aFrame->PresContext()->AppUnitsPerDevPixel()));
+      StrokeSnappedEdgesOfRect(rect, aDrawTarget, aColor, aStrokeOptions);
+    }
+  }
+}
+
+void RectArea::GetRect(nsIFrame* aFrame, nsRect& aRect) {
+  if (mNumCoords >= 4) {
+    nscoord x1 = nsPresContext::CSSPixelsToAppUnits(mCoords[0]);
+    nscoord y1 = nsPresContext::CSSPixelsToAppUnits(mCoords[1]);
+    nscoord x2 = nsPresContext::CSSPixelsToAppUnits(mCoords[2]);
+    nscoord y2 = nsPresContext::CSSPixelsToAppUnits(mCoords[3]);
+    NS_ASSERTION(x1 <= x2 && y1 <= y2,
+                 "Someone screwed up RectArea::ParseCoords");
+
+    aRect.SetRect(x1, y1, x2, y2);
+  }
+}
+
+//----------------------------------------------------------------------
+
+class PolyArea final : public Area {
+ public:
+  explicit PolyArea(HTMLAreaElement* aArea);
+
+  virtual void ParseCoords(const nsAString& aSpec) override;
+  virtual bool IsInside(nscoord x, nscoord y) const override;
+  virtual void Draw(nsIFrame* aFrame, DrawTarget& aDrawTarget,
+                    const ColorPattern& aColor,
+                    const StrokeOptions& aStrokeOptions) override;
+  virtual void GetRect(nsIFrame* aFrame, nsRect& aRect) override;
+};
+
+PolyArea::PolyArea(HTMLAreaElement* aArea) : Area(aArea) {}
+
+void PolyArea::ParseCoords(const nsAString& aSpec) {
+  Area::ParseCoords(aSpec);
+
+  if (mNumCoords >= 2) {
+    if (mNumCoords & 1U) {
+      logMessage(mArea, aSpec, nsIScriptError::warningFlag,
+                 "ImageMapPolyOddNumberOfCoords");
+    }
+  } else {
+    logMessage(mArea, aSpec, nsIScriptError::errorFlag,
+               "ImageMapPolyWrongNumberOfCoords");
+  }
+}
+
+bool PolyArea::IsInside(nscoord x, nscoord y) const {
+  if (mNumCoords >= 6) {
+    int32_t intersects = 0;
+    nscoord wherex = x;
+    nscoord wherey = y;
+    int32_t totalv = mNumCoords / 2;
+    int32_t totalc = totalv * 2;
+    nscoord xval = mCoords[totalc - 2];
+    nscoord yval = mCoords[totalc - 1];
+    int32_t end = totalc;
+    int32_t pointer = 1;
+
+    if ((yval >= wherey) != (mCoords[pointer] >= wherey)) {
+      if ((xval >= wherex) == (mCoords[0] >= wherex)) {
+        intersects += (xval >= wherex) ? 1 : 0;
+      } else {
+        intersects += ((xval - (yval - wherey) * (mCoords[0] - xval) /
+                                   (mCoords[pointer] - yval)) >= wherex)
+                          ? 1
+                          : 0;
+      }
+    }
+
+    // XXX I wonder what this is doing; this is a translation of ptinpoly.c
+    while (pointer < end) {
+      yval = mCoords[pointer];
+      pointer += 2;
+      if (yval >= wherey) {
+        while ((pointer < end) && (mCoords[pointer] >= wherey)) pointer += 2;
+        if (pointer >= end) break;
+        if ((mCoords[pointer - 3] >= wherex) ==
+            (mCoords[pointer - 1] >= wherex)) {
+          intersects += (mCoords[pointer - 3] >= wherex) ? 1 : 0;
+        } else {
+          intersects +=
+              ((mCoords[pointer - 3] -
+                (mCoords[pointer - 2] - wherey) *
+                    (mCoords[pointer - 1] - mCoords[pointer - 3]) /
+                    (mCoords[pointer] - mCoords[pointer - 2])) >= wherex)
+                  ? 1
+                  : 0;
+        }
+      } else {
+        while ((pointer < end) && (mCoords[pointer] < wherey)) pointer += 2;
+        if (pointer >= end) break;
+        if ((mCoords[pointer - 3] >= wherex) ==
+            (mCoords[pointer - 1] >= wherex)) {
+          intersects += (mCoords[pointer - 3] >= wherex) ? 1 : 0;
+        } else {
+          intersects +=
+              ((mCoords[pointer - 3] -
+                (mCoords[pointer - 2] - wherey) *
+                    (mCoords[pointer - 1] - mCoords[pointer - 3]) /
+                    (mCoords[pointer] - mCoords[pointer - 2])) >= wherex)
+                  ? 1
+                  : 0;
+        }
+      }
+    }
+    if ((intersects & 1) != 0) {
+      return true;
+    }
+  }
+  return false;
+}
+
+void PolyArea::Draw(nsIFrame* aFrame, DrawTarget& aDrawTarget,
+                    const ColorPattern& aColor,
+                    const StrokeOptions& aStrokeOptions) {
+  if (mHasFocus) {
+    if (mNumCoords >= 6) {
+      // Where possible, we want all horizontal and vertical lines to align on
+      // pixel rows or columns, and to start at pixel boundaries so that one
+      // pixel dashing neatly sits on pixels to give us neat lines. To achieve
+      // that we draw each line segment as a separate path, snapping it to
+      // device pixels if applicable.
+      nsPresContext* pc = aFrame->PresContext();
+      Point p1(pc->CSSPixelsToDevPixels(mCoords[0]),
+               pc->CSSPixelsToDevPixels(mCoords[1]));
+      Point p2, p1snapped, p2snapped;
+      for (int32_t i = 2; i < mNumCoords; i += 2) {
+        p2.x = pc->CSSPixelsToDevPixels(mCoords[i]);
+        p2.y = pc->CSSPixelsToDevPixels(mCoords[i + 1]);
+        p1snapped = p1;
+        p2snapped = p2;
+        SnapLineToDevicePixelsForStroking(p1snapped, p2snapped, aDrawTarget,
+                                          aStrokeOptions.mLineWidth);
+        aDrawTarget.StrokeLine(p1snapped, p2snapped, aColor, aStrokeOptions);
+        p1 = p2;
+      }
+      p2.x = pc->CSSPixelsToDevPixels(mCoords[0]);
+      p2.y = pc->CSSPixelsToDevPixels(mCoords[1]);
+      p1snapped = p1;
+      p2snapped = p2;
+      SnapLineToDevicePixelsForStroking(p1snapped, p2snapped, aDrawTarget,
+                                        aStrokeOptions.mLineWidth);
+      aDrawTarget.StrokeLine(p1snapped, p2snapped, aColor, aStrokeOptions);
+    }
+  }
+}
+
+void PolyArea::GetRect(nsIFrame* aFrame, nsRect& aRect) {
+  if (mNumCoords >= 6) {
+    nscoord x1, x2, y1, y2, xtmp, ytmp;
+    x1 = x2 = nsPresContext::CSSPixelsToAppUnits(mCoords[0]);
+    y1 = y2 = nsPresContext::CSSPixelsToAppUnits(mCoords[1]);
+    for (int32_t i = 2; i < mNumCoords; i += 2) {
+      xtmp = nsPresContext::CSSPixelsToAppUnits(mCoords[i]);
+      ytmp = nsPresContext::CSSPixelsToAppUnits(mCoords[i + 1]);
+      x1 = x1 < xtmp ? x1 : xtmp;
+      y1 = y1 < ytmp ? y1 : ytmp;
+      x2 = x2 > xtmp ? x2 : xtmp;
+      y2 = y2 > ytmp ? y2 : ytmp;
+    }
+
+    aRect.SetRect(x1, y1, x2, y2);
+  }
+}
+
+//----------------------------------------------------------------------
+
+class CircleArea final : public Area {
+ public:
+  explicit CircleArea(HTMLAreaElement* aArea);
+
+  virtual void ParseCoords(const nsAString& aSpec) override;
+  virtual bool IsInside(nscoord x, nscoord y) const override;
+  virtual void Draw(nsIFrame* aFrame, DrawTarget& aDrawTarget,
+                    const ColorPattern& aColor,
+                    const StrokeOptions& aStrokeOptions) override;
+  virtual void GetRect(nsIFrame* aFrame, nsRect& aRect) override;
+};
+
+CircleArea::CircleArea(HTMLAreaElement* aArea) : Area(aArea) {}
+
+void CircleArea::ParseCoords(const nsAString& aSpec) {
+  Area::ParseCoords(aSpec);
+
+  bool wrongNumberOfCoords = false;
+  int32_t flag = nsIScriptError::warningFlag;
+  if (mNumCoords >= 3) {
+    if (mCoords[2] < 0) {
+      logMessage(mArea, aSpec, nsIScriptError::errorFlag,
+                 "ImageMapCircleNegativeRadius");
+    }
+
+    if (mNumCoords > 3) {
+      wrongNumberOfCoords = true;
+    }
+  } else {
+    wrongNumberOfCoords = true;
+    flag = nsIScriptError::errorFlag;
+  }
+
+  if (wrongNumberOfCoords) {
+    logMessage(mArea, aSpec, flag, "ImageMapCircleWrongNumberOfCoords");
+  }
+}
+
+bool CircleArea::IsInside(nscoord x, nscoord y) const {
+  // Note: > is for nav compatibility
+  if (mNumCoords >= 3) {
+    nscoord x1 = mCoords[0];
+    nscoord y1 = mCoords[1];
+    nscoord radius = mCoords[2];
+    if (radius < 0) {
+      return false;
+    }
+    nscoord dx = x1 - x;
+    nscoord dy = y1 - y;
+    nscoord dist = (dx * dx) + (dy * dy);
+    if (dist <= (radius * radius)) {
+      return true;
+    }
+  }
+  return false;
+}
+
+void CircleArea::Draw(nsIFrame* aFrame, DrawTarget& aDrawTarget,
+                      const ColorPattern& aColor,
+                      const StrokeOptions& aStrokeOptions) {
+  if (mHasFocus) {
+    if (mNumCoords >= 3) {
+      Point center(aFrame->PresContext()->CSSPixelsToDevPixels(mCoords[0]),
+                   aFrame->PresContext()->CSSPixelsToDevPixels(mCoords[1]));
+      Float diameter =
+          2 * aFrame->PresContext()->CSSPixelsToDevPixels(mCoords[2]);
+      if (diameter <= 0) {
+        return;
+      }
+      RefPtr<PathBuilder> builder = aDrawTarget.CreatePathBuilder();
+      AppendEllipseToPath(builder, center, Size(diameter, diameter));
+      RefPtr<Path> circle = builder->Finish();
+      aDrawTarget.Stroke(circle, aColor, aStrokeOptions);
+    }
+  }
+}
+
+void CircleArea::GetRect(nsIFrame* aFrame, nsRect& aRect) {
+  if (mNumCoords >= 3) {
+    nscoord x1 = nsPresContext::CSSPixelsToAppUnits(mCoords[0]);
+    nscoord y1 = nsPresContext::CSSPixelsToAppUnits(mCoords[1]);
+    nscoord radius = nsPresContext::CSSPixelsToAppUnits(mCoords[2]);
+    if (radius < 0) {
+      return;
+    }
+
+    aRect.SetRect(x1 - radius, y1 - radius, x1 + radius, y1 + radius);
+  }
+}
+
+//----------------------------------------------------------------------
+
+nsImageMap::nsImageMap() : mImageFrame(nullptr), mConsiderWholeSubtree(false) {}
+
+nsImageMap::~nsImageMap() {
+  NS_ASSERTION(mAreas.Length() == 0, "Destroy was not called");
+}
+
+NS_IMPL_ISUPPORTS(nsImageMap, nsIMutationObserver, nsIDOMEventListener)
+
+nsresult nsImageMap::GetBoundsForAreaContent(nsIContent* aContent,
+                                             nsRect& aBounds) {
+  NS_ENSURE_TRUE(aContent && mImageFrame, NS_ERROR_INVALID_ARG);
+
+  // Find the Area struct associated with this content node, and return bounds
+  for (auto& area : mAreas) {
+    if (area->mArea == aContent) {
+      aBounds = nsRect();
+      area->GetRect(mImageFrame, aBounds);
+      return NS_OK;
+    }
+  }
+  return NS_ERROR_FAILURE;
+}
+
+void nsImageMap::AreaRemoved(HTMLAreaElement* aArea) {
+  if (aArea->GetPrimaryFrame() == mImageFrame) {
+    aArea->SetPrimaryFrame(nullptr);
+  }
+
+  aArea->RemoveSystemEventListener(u"focus"_ns, this, false);
+  aArea->RemoveSystemEventListener(u"blur"_ns, this, false);
+}
+
+void nsImageMap::FreeAreas() {
+  for (UniquePtr<Area>& area : mAreas) {
+    AreaRemoved(area->mArea);
+  }
+
+  mAreas.Clear();
+}
+
+void nsImageMap::Init(nsImageFrame* aImageFrame, nsIContent* aMap) {
+  MOZ_ASSERT(aMap);
+  MOZ_ASSERT(aImageFrame);
+
+  mImageFrame = aImageFrame;
+  mMap = aMap;
+  mMap->AddMutationObserver(this);
+
+  // "Compile" the areas in the map into faster access versions
+  UpdateAreas();
+}
+
+void nsImageMap::SearchForAreas(nsIContent* aParent) {
+  // Look for <area> elements.
+  for (nsIContent* child = aParent->GetFirstChild(); child;
+       child = child->GetNextSibling()) {
+    if (auto* area = HTMLAreaElement::FromNode(child)) {
+      AddArea(area);
+
+      // Continue to next child. This stops mConsiderWholeSubtree from
+      // getting set. It also makes us ignore children of <area>s which
+      // is consistent with how we react to dynamic insertion of such
+      // children.
+      continue;
+    }
+
+    if (child->IsElement()) {
+      mConsiderWholeSubtree = true;
+      SearchForAreas(child);
+    }
+  }
+}
+
+void nsImageMap::UpdateAreas() {
+  // Get rid of old area data
+  FreeAreas();
+
+  mConsiderWholeSubtree = false;
+  SearchForAreas(mMap);
+
+#ifdef ACCESSIBILITY
+  if (nsAccessibilityService* accService = GetAccService()) {
+    accService->UpdateImageMap(mImageFrame);
+  }
+#endif
+}
+
+void nsImageMap::AddArea(HTMLAreaElement* aArea) {
+  static Element::AttrValuesArray strings[] = {
+      nsGkAtoms::rect,     nsGkAtoms::rectangle,
+      nsGkAtoms::circle,   nsGkAtoms::circ,
+      nsGkAtoms::_default, nsGkAtoms::poly,
+      nsGkAtoms::polygon,  nullptr};
+
+  UniquePtr<Area> area;
+  switch (aArea->FindAttrValueIn(kNameSpaceID_None, nsGkAtoms::shape, strings,
+                                 eIgnoreCase)) {
+    case Element::ATTR_VALUE_NO_MATCH:
+    case Element::ATTR_MISSING:
+    case 0:
+    case 1:
+      area = MakeUnique<RectArea>(aArea);
+      break;
+    case 2:
+    case 3:
+      area = MakeUnique<CircleArea>(aArea);
+      break;
+    case 4:
+      area = MakeUnique<DefaultArea>(aArea);
+      break;
+    case 5:
+    case 6:
+      area = MakeUnique<PolyArea>(aArea);
+      break;
+    default:
+      area = nullptr;
+      MOZ_ASSERT_UNREACHABLE("FindAttrValueIn returned an unexpected value.");
+      break;
+  }
+
+  // Add focus listener to track area focus changes
+  aArea->AddSystemEventListener(u"focus"_ns, this, false, false);
+  aArea->AddSystemEventListener(u"blur"_ns, this, false, false);
+
+  // This is a nasty hack.  It needs to go away: see bug 135040.  Once this is
+  // removed, the code added to RestyleManager::RestyleElement,
+  // nsCSSFrameConstructor::ContentRemoved (both hacks there), and
+  // RestyleManager::ProcessRestyledFrames to work around this issue can
+  // be removed.
+  aArea->SetPrimaryFrame(mImageFrame);
+
+  nsAutoString coords;
+  aArea->GetAttr(kNameSpaceID_None, nsGkAtoms::coords, coords);
+  area->ParseCoords(coords);
+  mAreas.AppendElement(std::move(area));
+}
+
+HTMLAreaElement* nsImageMap::GetArea(nscoord aX, nscoord aY) const {
+  NS_ASSERTION(mMap, "Not initialized");
+  for (const auto& area : mAreas) {
+    if (area->IsInside(aX, aY)) {
+      return area->mArea;
+    }
+  }
+
+  return nullptr;
+}
+
+HTMLAreaElement* nsImageMap::GetAreaAt(uint32_t aIndex) const {
+  return mAreas.ElementAt(aIndex)->mArea;
+}
+
+void nsImageMap::Draw(nsIFrame* aFrame, DrawTarget& aDrawTarget,
+                      const ColorPattern& aColor,
+                      const StrokeOptions& aStrokeOptions) {
+  for (auto& area : mAreas) {
+    area->Draw(aFrame, aDrawTarget, aColor, aStrokeOptions);
+  }
+}
+
+void nsImageMap::MaybeUpdateAreas(nsIContent* aContent) {
+  if (aContent == mMap || mConsiderWholeSubtree) {
+    UpdateAreas();
+  }
+}
+
+void nsImageMap::AttributeChanged(dom::Element* aElement, int32_t aNameSpaceID,
+                                  nsAtom* aAttribute, int32_t aModType,
+                                  const nsAttrValue* aOldValue) {
+  // If the parent of the changing content node is our map then update
+  // the map.  But only do this if the node is an HTML <area> or <a>
+  // and the attribute that's changing is "shape" or "coords" -- those
+  // are the only cases we care about.
+  if ((aElement->NodeInfo()->Equals(nsGkAtoms::area) ||
+       aElement->NodeInfo()->Equals(nsGkAtoms::a)) &&
+      aElement->IsHTMLElement() && aNameSpaceID == kNameSpaceID_None &&
+      (aAttribute == nsGkAtoms::shape || aAttribute == nsGkAtoms::coords)) {
+    MaybeUpdateAreas(aElement->GetParent());
+  } else if (aElement == mMap && aNameSpaceID == kNameSpaceID_None &&
+             (aAttribute == nsGkAtoms::name || aAttribute == nsGkAtoms::id) &&
+             mImageFrame) {
+    // ID or name has changed. Let ImageFrame recreate ImageMap.
+    mImageFrame->DisconnectMap();
+  }
+}
+
+void nsImageMap::ContentAppended(nsIContent* aFirstNewContent) {
+  MaybeUpdateAreas(aFirstNewContent->GetParent());
+}
+
+void nsImageMap::ContentInserted(nsIContent* aChild) {
+  MaybeUpdateAreas(aChild->GetParent());
+}
+
+static UniquePtr<Area> TakeArea(nsImageMap::AreaList& aAreas,
+                                HTMLAreaElement* aArea) {
+  UniquePtr<Area> result;
+  size_t index = 0;
+  for (UniquePtr<Area>& area : aAreas) {
+    if (area->mArea == aArea) {
+      result = std::move(area);
+      break;
+    }
+    index++;
+  }
+
+  if (result) {
+    aAreas.RemoveElementAt(index);
+  }
+
+  return result;
+}
+
+void nsImageMap::ContentRemoved(nsIContent* aChild,
+                                nsIContent* aPreviousSibling) {
+  if (aChild->GetParent() != mMap && !mConsiderWholeSubtree) {
+    return;
+  }
+
+  auto* areaElement = HTMLAreaElement::FromNode(aChild);
+  if (!areaElement) {
+    return;
+  }
+
+  UniquePtr<Area> area = TakeArea(mAreas, areaElement);
+  if (!area) {
+    return;
+  }
+
+  AreaRemoved(area->mArea);
+
+#ifdef ACCESSIBILITY
+  if (nsAccessibilityService* accService = GetAccService()) {
+    accService->UpdateImageMap(mImageFrame);
+  }
+#endif
+}
+
+void nsImageMap::ParentChainChanged(nsIContent* aContent) {
+  NS_ASSERTION(aContent == mMap, "Unexpected ParentChainChanged notification!");
+  if (mImageFrame) {
+    mImageFrame->DisconnectMap();
+  }
+}
+
+nsresult nsImageMap::HandleEvent(Event* aEvent) {
+  nsAutoString eventType;
+  aEvent->GetType(eventType);
+  bool focus = eventType.EqualsLiteral("focus");
+  MOZ_ASSERT(focus == !eventType.EqualsLiteral("blur"),
+             "Unexpected event type");
+
+  // Set which one of our areas changed focus
+  nsCOMPtr<nsIContent> targetContent = do_QueryInterface(aEvent->GetTarget());
+  if (!targetContent) {
+    return NS_OK;
+  }
+
+  for (auto& area : mAreas) {
+    if (area->mArea == targetContent) {
+      // Set or Remove internal focus
+      area->HasFocus(focus);
+      // Now invalidate the rect
+      if (mImageFrame) {
+        mImageFrame->InvalidateFrame();
+      }
+      break;
+    }
+  }
+  return NS_OK;
+}
+
+void nsImageMap::Destroy() {
+  FreeAreas();
+  mImageFrame = nullptr;
+  mMap->RemoveMutationObserver(this);
+}