The Tor Browser: layout/generic/nsImageMap.cpp@b8a032363ba2 (annotated)

layout/generic/nsImageMap.cpp@b8a032363ba2 (annotated)

layout/generic/nsImageMap.cpp

Thu, 22 Jan 2015 13:21:57 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 22 Jan 2015 13:21:57 +0100
branch: TOR_BUG_9701
changeset 15: b8a032363ba2
permissions: -rw-r--r--

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

 /* -*- 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/. */
 /* code for HTML client-side image maps */
 #include "nsImageMap.h"
 #include "mozilla/dom/Element.h"
 #include "mozilla/dom/Event.h" // for nsIDOMEvent::InternalDOMEvent()
 #include "nsString.h"
 #include "nsReadableUtils.h"
 #include "nsRenderingContext.h"
 #include "nsPresContext.h"
 #include "nsNameSpaceManager.h"
 #include "nsGkAtoms.h"
 #include "nsImageFrame.h"
 #include "nsCoord.h"
 #include "nsIScriptError.h"
 #include "nsIStringBundle.h"
 #include "nsContentUtils.h"
 #ifdef ACCESSIBILITY
 #include "nsAccessibilityService.h"
 #endif
 using namespace mozilla;
 class Area {
 public:
   Area(nsIContent* aArea);
   virtual ~Area();
   virtual void ParseCoords(const nsAString& aSpec);
   virtual bool IsInside(nscoord x, nscoord y) const = 0;
   virtual void Draw(nsIFrame* aFrame, nsRenderingContext& aRC) = 0;
   virtual void GetRect(nsIFrame* aFrame, nsRect& aRect) = 0;
   void HasFocus(bool aHasFocus);
   nsCOMPtr<nsIContent> mArea;
   nscoord* mCoords;
   int32_t mNumCoords;
   bool mHasFocus;
 };
 Area::Area(nsIContent* aArea)
   : mArea(aArea)
 {
   MOZ_COUNT_CTOR(Area);
   NS_PRECONDITION(mArea, "How did that happen?");
   mCoords = nullptr;
   mNumCoords = 0;
   mHasFocus = false;
 }
 Area::~Area()
 {
   MOZ_COUNT_DTOR(Area);
   delete [] mCoords;
 }
 #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) {
   nsIDocument* doc = aContent->OwnerDoc();
   nsContentUtils::ReportToConsole(
      aFlags, NS_LITERAL_CSTRING("ImageMap"), doc,
      nsContentUtils::eLAYOUT_PROPERTIES,
      aMessageName,
      nullptr,  /* params */
 , /* params length */
      nullptr,
      PromiseFlatString(NS_LITERAL_STRING("coords=\"") +
                        aCoordsSpec +
                        NS_LITERAL_STRING("\""))); /* source line */
 }
 void Area::ParseCoords(const nsAString& aSpec)
 {
   char* cp = ToNewCString(aSpec);
   if (cp) {
     char *tptr;
     char *n_str;
     int32_t i, cnt;
     int32_t *value_list;
     /*
      * Nothing in an empty list
      */
     mNumCoords = 0;
     mCoords = nullptr;
     if (*cp == '\0')
     {
       nsMemory::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')
     {
       nsMemory::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.
      */
     value_list = new nscoord[cnt];
     if (!value_list)
     {
       nsMemory::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 = value_list;
     nsMemory::Free(cp);
   }
 }
 void Area::HasFocus(bool aHasFocus)
 {
   mHasFocus = aHasFocus;
 }
 //----------------------------------------------------------------------
 class DefaultArea : public Area {
 public:
   DefaultArea(nsIContent* aArea);
   virtual bool IsInside(nscoord x, nscoord y) const MOZ_OVERRIDE;
   virtual void Draw(nsIFrame* aFrame, nsRenderingContext& aRC) MOZ_OVERRIDE;
   virtual void GetRect(nsIFrame* aFrame, nsRect& aRect) MOZ_OVERRIDE;
 };
 DefaultArea::DefaultArea(nsIContent* aArea)
   : Area(aArea)
 {
 }
 bool DefaultArea::IsInside(nscoord x, nscoord y) const
 {
   return true;
 }
 void DefaultArea::Draw(nsIFrame* aFrame, nsRenderingContext& aRC)
 {
   if (mHasFocus) {
     nsRect r = aFrame->GetRect();
     r.MoveTo(0, 0);
     nscoord x1 = r.x;
     nscoord y1 = r.y;
     const nscoord kOnePixel = nsPresContext::CSSPixelsToAppUnits(1);
     nscoord x2 = r.XMost() - kOnePixel;
     nscoord y2 = r.YMost() - kOnePixel;
     // XXX aRC.DrawRect(r) result is ugly, that's why we use DrawLine.
     aRC.DrawLine(x1, y1, x1, y2);
     aRC.DrawLine(x1, y2, x2, y2);
     aRC.DrawLine(x1, y1, x2, y1);
     aRC.DrawLine(x2, y1, x2, y2);
   }
 }
 void DefaultArea::GetRect(nsIFrame* aFrame, nsRect& aRect)
 {
   aRect = aFrame->GetRect();
   aRect.MoveTo(0, 0);
 }
 //----------------------------------------------------------------------
 class RectArea : public Area {
 public:
   RectArea(nsIContent* aArea);
   virtual void ParseCoords(const nsAString& aSpec) MOZ_OVERRIDE;
   virtual bool IsInside(nscoord x, nscoord y) const MOZ_OVERRIDE;
   virtual void Draw(nsIFrame* aFrame, nsRenderingContext& aRC) MOZ_OVERRIDE;
   virtual void GetRect(nsIFrame* aFrame, nsRect& aRect) MOZ_OVERRIDE;
 };
 RectArea::RectArea(nsIContent* 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, nsRenderingContext& aRC)
 {
   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");
       aRC.DrawLine(x1, y1, x1, y2);
       aRC.DrawLine(x1, y2, x2, y2);
       aRC.DrawLine(x1, y1, x2, y1);
       aRC.DrawLine(x2, y1, x2, y2);
     }
   }
 }
 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 : public Area {
 public:
   PolyArea(nsIContent* aArea);
   virtual void ParseCoords(const nsAString& aSpec) MOZ_OVERRIDE;
   virtual bool IsInside(nscoord x, nscoord y) const MOZ_OVERRIDE;
   virtual void Draw(nsIFrame* aFrame, nsRenderingContext& aRC) MOZ_OVERRIDE;
   virtual void GetRect(nsIFrame* aFrame, nsRect& aRect) MOZ_OVERRIDE;
 };
 PolyArea::PolyArea(nsIContent* 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, nsRenderingContext& aRC)
 {
   if (mHasFocus) {
     if (mNumCoords >= 6) {
       nscoord x0 = nsPresContext::CSSPixelsToAppUnits(mCoords[0]);
       nscoord y0 = nsPresContext::CSSPixelsToAppUnits(mCoords[1]);
       nscoord x1, y1;
       for (int32_t i = 2; i < mNumCoords; i += 2) {
         x1 = nsPresContext::CSSPixelsToAppUnits(mCoords[i]);
         y1 = nsPresContext::CSSPixelsToAppUnits(mCoords[i+1]);
         aRC.DrawLine(x0, y0, x1, y1);
         x0 = x1;
         y0 = y1;
       }
       x1 = nsPresContext::CSSPixelsToAppUnits(mCoords[0]);
       y1 = nsPresContext::CSSPixelsToAppUnits(mCoords[1]);
       aRC.DrawLine(x0, y0, x1, y1);
     }
   }
 }
 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 : public Area {
 public:
   CircleArea(nsIContent* aArea);
   virtual void ParseCoords(const nsAString& aSpec) MOZ_OVERRIDE;
   virtual bool IsInside(nscoord x, nscoord y) const MOZ_OVERRIDE;
   virtual void Draw(nsIFrame* aFrame, nsRenderingContext& aRC) MOZ_OVERRIDE;
   virtual void GetRect(nsIFrame* aFrame, nsRect& aRect) MOZ_OVERRIDE;
 };
 CircleArea::CircleArea(nsIContent* 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, nsRenderingContext& aRC)
 {
   if (mHasFocus) {
     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;
       }
       nscoord x = x1 - radius;
       nscoord y = y1 - radius;
       nscoord w = 2 * radius;
       aRC.DrawEllipse(x, y, w, w);
     }
   }
 }
 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),
   mContainsBlockContents(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
   uint32_t i, n = mAreas.Length();
   for (i = 0; i < n; i++) {
     Area* area = mAreas.ElementAt(i);
     if (area->mArea == aContent) {
       aBounds = nsRect();
       area->GetRect(mImageFrame, aBounds);
       return NS_OK;
     }
   }
   return NS_ERROR_FAILURE;
 }
 void
 nsImageMap::FreeAreas()
 {
   uint32_t i, n = mAreas.Length();
   for (i = 0; i < n; i++) {
     Area* area = mAreas.ElementAt(i);
     if (area->mArea->IsInDoc()) {
       NS_ASSERTION(area->mArea->GetPrimaryFrame() == mImageFrame,
                    "Unexpected primary frame");
       area->mArea->SetPrimaryFrame(nullptr);
     }
     area->mArea->RemoveSystemEventListener(NS_LITERAL_STRING("focus"), this,
                                            false);
     area->mArea->RemoveSystemEventListener(NS_LITERAL_STRING("blur"), this,
                                            false);
     delete area;
   }
   mAreas.Clear();
 }
 nsresult
 nsImageMap::Init(nsImageFrame* aImageFrame, nsIContent* aMap)
 {
   NS_PRECONDITION(aMap, "null ptr");
   if (!aMap) {
     return NS_ERROR_NULL_POINTER;
   }
   mImageFrame = aImageFrame;
   mMap = aMap;
   mMap->AddMutationObserver(this);
   // "Compile" the areas in the map into faster access versions
   return UpdateAreas();
 }
 nsresult
 nsImageMap::SearchForAreas(nsIContent* aParent, bool& aFoundArea,
                            bool& aFoundAnchor)
 {
   nsresult rv = NS_OK;
   uint32_t i, n = aParent->GetChildCount();
   // Look for <area> or <a> elements. We'll use whichever type we find first.
   for (i = 0; i < n; i++) {
     nsIContent *child = aParent->GetChildAt(i);
     if (child->IsHTML()) {
       // If we haven't determined that the map element contains an
       // <a> element yet, then look for <area>.
       if (!aFoundAnchor && child->Tag() == nsGkAtoms::area) {
         aFoundArea = true;
         rv = AddArea(child);
         NS_ENSURE_SUCCESS(rv, rv);
         // Continue to next child. This stops mContainsBlockContents 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 we haven't determined that the map element contains an
       // <area> element yet, then look for <a>.
       if (!aFoundArea && child->Tag() == nsGkAtoms::a) {
         aFoundAnchor = true;
         rv = AddArea(child);
         NS_ENSURE_SUCCESS(rv, rv);
       }
     }
     if (child->IsElement()) {
       mContainsBlockContents = true;
       rv = SearchForAreas(child, aFoundArea, aFoundAnchor);
       NS_ENSURE_SUCCESS(rv, rv);
     }
   }
   return NS_OK;
 }
 nsresult
 nsImageMap::UpdateAreas()
 {
   // Get rid of old area data
   FreeAreas();
   bool foundArea = false;
   bool foundAnchor = false;
   mContainsBlockContents = false;
   nsresult rv = SearchForAreas(mMap, foundArea, foundAnchor);
 #ifdef ACCESSIBILITY
   if (NS_SUCCEEDED(rv)) {
     nsAccessibilityService* accService = GetAccService();
     if (accService) {
       accService->UpdateImageMap(mImageFrame);
     }
   }
 #endif
   return rv;
 }
 nsresult
 nsImageMap::AddArea(nsIContent* aArea)
 {
   static nsIContent::AttrValuesArray strings[] =
     {&nsGkAtoms::rect, &nsGkAtoms::rectangle,
      &nsGkAtoms::circle, &nsGkAtoms::circ,
      &nsGkAtoms::_default,
      &nsGkAtoms::poly, &nsGkAtoms::polygon,
      nullptr};
   Area* area;
   switch (aArea->FindAttrValueIn(kNameSpaceID_None, nsGkAtoms::shape,
                                  strings, eIgnoreCase)) {
   case nsIContent::ATTR_VALUE_NO_MATCH:
   case nsIContent::ATTR_MISSING:
   case 0:
   case 1:
     area = new RectArea(aArea);
     break;
   case 2:
   case 3:
     area = new CircleArea(aArea);
     break;
   case 4:
     area = new DefaultArea(aArea);
     break;
   case 5:
   case 6:
     area = new PolyArea(aArea);
     break;
   default:
     area = nullptr;
     NS_NOTREACHED("FindAttrValueIn returned an unexpected value.");
     break;
   }
   if (!area)
     return NS_ERROR_OUT_OF_MEMORY;
   //Add focus listener to track area focus changes
   aArea->AddSystemEventListener(NS_LITERAL_STRING("focus"), this, false,
                                 false);
   aArea->AddSystemEventListener(NS_LITERAL_STRING("blur"), 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(area);
   return NS_OK;
 }
 nsIContent*
 nsImageMap::GetArea(nscoord aX, nscoord aY) const
 {
   NS_ASSERTION(mMap, "Not initialized");
   uint32_t i, n = mAreas.Length();
   for (i = 0; i < n; i++) {
     Area* area = mAreas.ElementAt(i);
     if (area->IsInside(aX, aY)) {
       return area->mArea;
     }
   }
   return nullptr;
 }
 nsIContent*
 nsImageMap::GetAreaAt(uint32_t aIndex) const
 {
   return mAreas.ElementAt(aIndex)->mArea;
 }
 void
 nsImageMap::Draw(nsIFrame* aFrame, nsRenderingContext& aRC)
 {
   uint32_t i, n = mAreas.Length();
   for (i = 0; i < n; i++) {
     Area* area = mAreas.ElementAt(i);
     area->Draw(aFrame, aRC);
   }
 }
 void
 nsImageMap::MaybeUpdateAreas(nsIContent *aContent)
 {
   if (aContent == mMap || mContainsBlockContents) {
     UpdateAreas();
   }
 }
 void
 nsImageMap::AttributeChanged(nsIDocument*  aDocument,
                              dom::Element* aElement,
                              int32_t       aNameSpaceID,
                              nsIAtom*      aAttribute,
                              int32_t       aModType)
 {
   // 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->IsHTML() &&
       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(nsIDocument *aDocument,
                             nsIContent* aContainer,
                             nsIContent* aFirstNewContent,
                             int32_t     /* unused */)
 {
   MaybeUpdateAreas(aContainer);
 }
 void
 nsImageMap::ContentInserted(nsIDocument *aDocument,
                             nsIContent* aContainer,
                             nsIContent* aChild,
                             int32_t /* unused */)
 {
   MaybeUpdateAreas(aContainer);
 }
 void
 nsImageMap::ContentRemoved(nsIDocument *aDocument,
                            nsIContent* aContainer,
                            nsIContent* aChild,
                            int32_t aIndexInContainer,
                            nsIContent* aPreviousSibling)
 {
   MaybeUpdateAreas(aContainer);
 }
 void
 nsImageMap::ParentChainChanged(nsIContent* aContent)
 {
   NS_ASSERTION(aContent == mMap,
                "Unexpected ParentChainChanged notification!");
   if (mImageFrame) {
     mImageFrame->DisconnectMap();
   }
 }
 nsresult
 nsImageMap::HandleEvent(nsIDOMEvent* aEvent)
 {
   nsAutoString eventType;
   aEvent->GetType(eventType);
   bool focus = eventType.EqualsLiteral("focus");
   NS_ABORT_IF_FALSE(focus == !eventType.EqualsLiteral("blur"),
                     "Unexpected event type");
   //Set which one of our areas changed focus
   nsCOMPtr<nsIContent> targetContent = do_QueryInterface(
     aEvent->InternalDOMEvent()->GetTarget());
   if (!targetContent) {
     return NS_OK;
   }
   uint32_t i, n = mAreas.Length();
   for (i = 0; i < n; i++) {
     Area* area = mAreas.ElementAt(i);
     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(void)
 {
   FreeAreas();
   mImageFrame = nullptr;
   mMap->RemoveMutationObserver(this);
 }

The Tor Browser / annotate

layout/generic/nsImageMap.cpp@b8a032363ba2 (annotated)

layout/generic/nsImageMap.cpp