Backed out changeset 3b956ceaaf8b (bug 1369815)

docshell/base/nsDocShell.cpp

@@ -842,7 +842,6 @@ nsDocShell::nsDocShell()
   , mDefaultLoadFlags(nsIRequest::LOAD_NORMAL)
   , mFrameType(FRAME_TYPE_REGULAR)
   , mPrivateBrowsingId(0)
-  , mDisplayMode(nsIDocShell::DISPLAY_MODE_BROWSER)
   , mForcedCharset(nullptr)
   , mParentCharset(nullptr)
   , mParentCharsetSource(0)
@@ -15089,33 +15088,3 @@ nsIDocShell::SetHTMLEditor(HTMLEditor* aHTMLEditor)
   nsDocShell* docShell = static_cast<nsDocShell*>(this);
   return docShell->SetHTMLEditorInternal(aHTMLEditor);
 }
-
-NS_IMETHODIMP
-nsDocShell::GetDisplayMode(uint32_t* aDisplayMode)
-{
-  NS_ENSURE_ARG_POINTER(aDisplayMode);
-  *aDisplayMode = mDisplayMode;
-  return NS_OK;
-}
-
-NS_IMETHODIMP
-nsDocShell::SetDisplayMode(uint32_t aDisplayMode)
-{
-  if (!(aDisplayMode == nsIDocShell::DISPLAY_MODE_BROWSER ||
-        aDisplayMode == nsIDocShell::DISPLAY_MODE_STANDALONE ||
-        aDisplayMode == nsIDocShell::DISPLAY_MODE_FULLSCREEN ||
-        aDisplayMode == nsIDocShell::DISPLAY_MODE_MINIMAL_UI)) {
-    return NS_ERROR_INVALID_ARG;
-  }
-
-  if (aDisplayMode != mDisplayMode) {
-    mDisplayMode = aDisplayMode;
-
-    nsPresContext* presContext;
-    if (NS_SUCCEEDED(GetPresContext(&presContext))) {
-      presContext->MediaFeatureValuesChangedAllDocuments(nsRestyleHint(0));
-    }
-  }
-
-  return NS_OK;
-}

docshell/base/nsDocShell.h

@@ -1054,18 +1054,6 @@ protected:
 
   nsString mInterceptedDocumentId;
 
-  // This represents the CSS display-mode we are currently using.
-  // It can be any of the following values from nsIDocShell.idl:
-  //
-  // DISPLAY_MODE_BROWSER = 0
-  // DISPLAY_MODE_MINIMAL_UI = 1
-  // DISPLAY_MODE_STANDALONE = 2
-  // DISPLAY_MODE_FULLSCREEN = 3
-  //
-  // This is mostly used for media queries. The integer values above
-  // match those used in nsStyleConsts.h
-  uint32_t mDisplayMode;
-
 private:
   const Encoding* mForcedCharset;
   const Encoding* mParentCharset;

docshell/base/nsIDocShell.idl

@@ -1164,19 +1164,4 @@ interface nsIDocShell : nsIDocShellTreeItem
   mozilla::HTMLEditor* GetHTMLEditor();
   nsresult SetHTMLEditor(mozilla::HTMLEditor* aHTMLEditor);
 %}
-
-  /**
-   * Allowed CSS display modes. This needs to be kept in
-   * sync with similar values in nsStyleConsts.h
-   */
-  const unsigned long DISPLAY_MODE_BROWSER = 0;
-  const unsigned long DISPLAY_MODE_MINIMAL_UI = 1;
-  const unsigned long DISPLAY_MODE_STANDALONE = 2;
-  const unsigned long DISPLAY_MODE_FULLSCREEN = 3;
-
-  /**
-   * Display mode for this docshell. Defaults to DISPLAY_MODE_BROWSER.
-   * Media queries only look at the value in the parent docshell.
-   */
-  attribute unsigned long displayMode;
 };

layout/style/nsMediaFeatures.cpp

@@ -18,7 +18,6 @@
 #include "nsCSSRuleProcessor.h"
 #include "nsDeviceContext.h"
 #include "nsIBaseWindow.h"
-#include "nsIDocShell.h"
 #include "nsIDocument.h"
 #include "nsIWidget.h"
 #include "nsContentUtils.h"
@@ -305,44 +304,33 @@ GetDisplayMode(nsPresContext* aPresContext, const nsMediaFeature*,
                nsCSSValue& aResult)
 {
   nsCOMPtr<nsISupports> container;
-  RefPtr<nsIDocShell> docShell;
-
-  if (!aPresContext) {
-    aResult.SetIntValue(NS_STYLE_DISPLAY_MODE_BROWSER, eCSSUnit_Enumerated);
-    return;
-  }
-
   if (aPresContext) {
     // Calling GetRootPresContext() can be slow, so make sure to call it
     // just once.
     nsRootPresContext* root = aPresContext->GetRootPresContext();
     if (root && root->Document()) {
       container = root->Document()->GetContainer();
-      docShell = root->GetDocShell();
     }
   }
-
   nsCOMPtr<nsIBaseWindow> baseWindow = do_QueryInterface(container);
-  if (baseWindow) {
-    nsCOMPtr<nsIWidget> mainWidget;
-    baseWindow->GetMainWidget(getter_AddRefs(mainWidget));
-    nsSizeMode mode = mainWidget ? mainWidget->SizeMode() : nsSizeMode_Normal;
-
-    if (mode == nsSizeMode_Fullscreen) {
-      aResult.SetIntValue(NS_STYLE_DISPLAY_MODE_FULLSCREEN, eCSSUnit_Enumerated);
-      return;
-    }
+  if (!baseWindow) {
+    aResult.SetIntValue(NS_STYLE_DISPLAY_MODE_BROWSER, eCSSUnit_Enumerated);
+    return;
   }
-
-  static_assert(nsIDocShell::DISPLAY_MODE_BROWSER == NS_STYLE_DISPLAY_MODE_BROWSER &&
-                nsIDocShell::DISPLAY_MODE_MINIMAL_UI == NS_STYLE_DISPLAY_MODE_MINIMAL_UI &&
-                nsIDocShell::DISPLAY_MODE_STANDALONE == NS_STYLE_DISPLAY_MODE_STANDALONE &&
-                nsIDocShell::DISPLAY_MODE_FULLSCREEN == NS_STYLE_DISPLAY_MODE_FULLSCREEN,
-                "nsIDocShell display modes must mach nsStyleConsts.h");
-
-  uint32_t displayMode = NS_STYLE_DISPLAY_MODE_BROWSER;
-  if (docShell) {
-    docShell->GetDisplayMode(&displayMode);
+  nsCOMPtr<nsIWidget> mainWidget;
+  baseWindow->GetMainWidget(getter_AddRefs(mainWidget));
+  int32_t displayMode;
+  nsSizeMode mode = mainWidget ? mainWidget->SizeMode() : nsSizeMode_Normal;
+  // Background tabs are always in 'browser' mode for now.
+  // If new modes are supported, please ensure not cause the regression in
+  // Bug 1259641.
+  switch (mode) {
+    case nsSizeMode_Fullscreen:
+      displayMode = NS_STYLE_DISPLAY_MODE_FULLSCREEN;
+      break;
+    default:
+      displayMode = NS_STYLE_DISPLAY_MODE_BROWSER;
+      break;
   }
 
   aResult.SetIntValue(displayMode, eCSSUnit_Enumerated);