Bug 1763191: Add suppport for cached remote accessibles in coordinate conversion functions r=eeejay

Differential Revision: https://phabricator.services.mozilla.com/D142970

accessible/atk/nsMaiInterfaceComponent.cpp

@@ -9,7 +9,6 @@
 #include "LocalAccessible-inl.h"
 #include "AccessibleWrap.h"
 #include "nsAccUtils.h"
-#include "nsCoreUtils.h"
 #include "nsMai.h"
 #include "mozilla/Likely.h"
 #include "mozilla/a11y/DocAccessibleParent.h"
@@ -89,18 +88,8 @@ AtkObject* refAccessibleAtPointHelper(AtkObject* aAtkObj, gint aX, gint aY,
 
   // Accessible::ChildAtPoint(x,y) is in screen pixels.
   if (aCoordType == ATK_XY_WINDOW) {
-    nsINode* node = nullptr;
-    if (acc->IsLocal()) {
-      node = acc->AsLocal()->GetNode();
-    } else {
-      // Use the XUL browser embedding this remote document.
-      auto browser = static_cast<mozilla::dom::BrowserParent*>(
-          acc->AsRemote()->Document()->Manager());
-      node = browser->GetOwnerElement();
-    }
-    MOZ_ASSERT(node);
     mozilla::LayoutDeviceIntPoint winCoords =
-        nsCoreUtils::GetScreenCoordsForWindow(node);
+        nsAccUtils::GetScreenCoordsForWindow(acc);
     aX += winCoords.x;
     aY += winCoords.y;
   }
@@ -138,7 +127,7 @@ void getExtentsHelper(AtkObject* aAtkObj, gint* aX, gint* aY, gint* aWidth,
 
     if (aCoordType == ATK_XY_WINDOW) {
       mozilla::LayoutDeviceIntPoint winCoords =
-          nsCoreUtils::GetScreenCoordsForWindow(accWrap->GetNode());
+          nsAccUtils::GetScreenCoordsForWindow(accWrap);
       screenRect.x -= winCoords.x;
       screenRect.y -= winCoords.y;
     }

accessible/base/nsAccUtils.cpp

@@ -18,6 +18,8 @@
 #include "States.h"
 #include "TextLeafAccessible.h"
 
+#include "nsIBaseWindow.h"
+#include "nsIDocShellTreeOwner.h"
 #include "nsIDOMXULContainerElement.h"
 #include "nsISimpleEnumerator.h"
 #include "mozilla/a11y/PDocAccessibleChild.h"
@@ -251,16 +253,17 @@ HyperTextAccessible* nsAccUtils::GetTextContainer(nsINode* aNode) {
 }
 
 LayoutDeviceIntPoint nsAccUtils::ConvertToScreenCoords(
-    int32_t aX, int32_t aY, uint32_t aCoordinateType,
-    LocalAccessible* aAccessible) {
+    int32_t aX, int32_t aY, uint32_t aCoordinateType, Accessible* aAccessible) {
   LayoutDeviceIntPoint coords(aX, aY);
 
   switch (aCoordinateType) {
+    // Regardless of coordinate type, the coords returned
+    // are in dev pixels.
     case nsIAccessibleCoordinateType::COORDTYPE_SCREEN_RELATIVE:
       break;
 
     case nsIAccessibleCoordinateType::COORDTYPE_WINDOW_RELATIVE: {
-      coords += nsCoreUtils::GetScreenCoordsForWindow(aAccessible->GetNode());
+      coords += GetScreenCoordsForWindow(aAccessible);
       break;
     }
 
@@ -278,14 +281,15 @@ LayoutDeviceIntPoint nsAccUtils::ConvertToScreenCoords(
 
 void nsAccUtils::ConvertScreenCoordsTo(int32_t* aX, int32_t* aY,
                                        uint32_t aCoordinateType,
-                                       LocalAccessible* aAccessible) {
+                                       Accessible* aAccessible) {
   switch (aCoordinateType) {
+    // Regardless of coordinate type, the values returned for
+    // aX and aY are in dev pixels.
     case nsIAccessibleCoordinateType::COORDTYPE_SCREEN_RELATIVE:
       break;
 
     case nsIAccessibleCoordinateType::COORDTYPE_WINDOW_RELATIVE: {
-      LayoutDeviceIntPoint coords =
-          nsCoreUtils::GetScreenCoordsForWindow(aAccessible->GetNode());
+      LayoutDeviceIntPoint coords = GetScreenCoordsForWindow(aAccessible);
       *aX -= coords.x;
       *aY -= coords.y;
       break;
@@ -304,17 +308,41 @@ void nsAccUtils::ConvertScreenCoordsTo(int32_t* aX, int32_t* aY,
 }
 
 LayoutDeviceIntPoint nsAccUtils::GetScreenCoordsForParent(
-    LocalAccessible* aAccessible) {
-  LocalAccessible* parent = aAccessible->LocalParent();
-  if (!parent) return LayoutDeviceIntPoint(0, 0);
+    Accessible* aAccessible) {
+  if (!aAccessible) return LayoutDeviceIntPoint();
 
-  nsIFrame* parentFrame = parent->GetFrame();
-  if (!parentFrame) return LayoutDeviceIntPoint(0, 0);
+  if (Accessible* parent = aAccessible->Parent()) {
+    LayoutDeviceIntRect parentBounds = parent->Bounds();
+    // The rect returned from Bounds() is already in dev
+    // pixels, so we don't need to do any conversion here.
+    return parentBounds.TopLeft();
+  }
 
-  nsRect rect = parentFrame->GetScreenRectInAppUnits();
-  nscoord appUnitsRatio = parentFrame->PresContext()->AppUnitsPerDevPixel();
-  return LayoutDeviceIntPoint::FromAppUnitsToNearest(
-      nsPoint(rect.X(), rect.Y()), appUnitsRatio);
+  return LayoutDeviceIntPoint();
+}
+
+LayoutDeviceIntPoint nsAccUtils::GetScreenCoordsForWindow(
+    Accessible* aAccessible) {
+  a11y::LocalAccessible* localAcc = aAccessible->AsLocal();
+  if (!localAcc) {
+    localAcc = aAccessible->AsRemote()->OuterDocOfRemoteBrowser();
+  }
+
+  LayoutDeviceIntPoint coords(0, 0);
+  nsCOMPtr<nsIDocShellTreeItem> treeItem(
+      nsCoreUtils::GetDocShellFor(localAcc->GetNode()));
+  if (!treeItem) return coords;
+
+  nsCOMPtr<nsIDocShellTreeOwner> treeOwner;
+  treeItem->GetTreeOwner(getter_AddRefs(treeOwner));
+  if (!treeOwner) return coords;
+
+  nsCOMPtr<nsIBaseWindow> baseWindow = do_QueryInterface(treeOwner);
+  if (baseWindow) {
+    baseWindow->GetPosition(&coords.x, &coords.y);  // in device pixels
+  }
+
+  return coords;
 }
 
 bool nsAccUtils::GetLiveAttrValue(uint32_t aRule, nsAString& aValue) {

accessible/base/nsAccUtils.h

@@ -140,9 +140,9 @@ class nsAccUtils {
    *                         relative it.
    * @return converted coordinates
    */
-  static LayoutDeviceIntPoint ConvertToScreenCoords(
-      int32_t aX, int32_t aY, uint32_t aCoordinateType,
-      LocalAccessible* aAccessible);
+  static LayoutDeviceIntPoint ConvertToScreenCoords(int32_t aX, int32_t aY,
+                                                    uint32_t aCoordinateType,
+                                                    Accessible* aAccessible);
 
   /**
    * Converts the given coordinates relative screen to another coordinate
@@ -157,7 +157,7 @@ class nsAccUtils {
    */
   static void ConvertScreenCoordsTo(int32_t* aX, int32_t* aY,
                                     uint32_t aCoordinateType,
-                                    LocalAccessible* aAccessible);
+                                    Accessible* aAccessible);
 
   /**
    * Returns screen-relative coordinates (in dev pixels) for the parent of the
@@ -165,8 +165,16 @@ class nsAccUtils {
    *
    * @param [in] aAccessible  the accessible
    */
-  static LayoutDeviceIntPoint GetScreenCoordsForParent(
-      LocalAccessible* aAccessible);
+  static LayoutDeviceIntPoint GetScreenCoordsForParent(Accessible* aAccessible);
+
+  /**
+   * Returns coordinates in device pixels relative screen for the top level
+   * window.
+   *
+   * @param aAccessible the acc hosted in the window.
+   */
+  static mozilla::LayoutDeviceIntPoint GetScreenCoordsForWindow(
+      mozilla::a11y::Accessible* aAccessible);
 
   /**
    * Get the 'live' or 'container-live' object attribute value from the given

accessible/base/nsCoreUtils.cpp

@@ -7,8 +7,6 @@
 
 #include "nsIAccessibleTypes.h"
 
-#include "nsIBaseWindow.h"
-#include "nsIDocShellTreeOwner.h"
 #include "mozilla/dom/Document.h"
 #include "nsRange.h"
 #include "nsXULElement.h"
@@ -322,23 +320,6 @@ void nsCoreUtils::ConvertScrollTypeToPercents(uint32_t aScrollType,
   *aHorizontal = ScrollAxis(whereX, whenX);
 }
 
-LayoutDeviceIntPoint nsCoreUtils::GetScreenCoordsForWindow(nsINode* aNode) {
-  LayoutDeviceIntPoint coords(0, 0);
-  nsCOMPtr<nsIDocShellTreeItem> treeItem(GetDocShellFor(aNode));
-  if (!treeItem) return coords;
-
-  nsCOMPtr<nsIDocShellTreeOwner> treeOwner;
-  treeItem->GetTreeOwner(getter_AddRefs(treeOwner));
-  if (!treeOwner) return coords;
-
-  nsCOMPtr<nsIBaseWindow> baseWindow = do_QueryInterface(treeOwner);
-  if (baseWindow) {
-    baseWindow->GetPosition(&coords.x, &coords.y);  // in device pixels
-  }
-
-  return coords;
-}
-
 already_AddRefed<nsIDocShell> nsCoreUtils::GetDocShellFor(nsINode* aNode) {
   if (!aNode) return nullptr;
 

accessible/base/nsCoreUtils.h

@@ -181,14 +181,6 @@ class nsCoreUtils {
                                           mozilla::ScrollAxis* aVertical,
                                           mozilla::ScrollAxis* aHorizontal);
 
-  /**
-   * Returns coordinates in device pixels relative screen for the top level
-   * window.
-   *
-   * @param aNode  the DOM node hosted in the window.
-   */
-  static mozilla::LayoutDeviceIntPoint GetScreenCoordsForWindow(nsINode* aNode);
-
   /**
    * Return document shell for the given DOM node.
    */

accessible/ipc/other/DocAccessibleChild.cpp

@@ -1601,7 +1601,7 @@ mozilla::ipc::IPCResult DocAccessibleChild::RecvExtents(
     if (!screenRect.IsEmpty()) {
       if (aNeedsScreenCoords) {
         LayoutDeviceIntPoint winCoords =
-            nsCoreUtils::GetScreenCoordsForWindow(acc->GetNode());
+            nsAccUtils::GetScreenCoordsForWindow(acc);
         screenRect.x -= winCoords.x;
         screenRect.y -= winCoords.y;
       }