2 files changed, 233 insertions, 0 deletions
diff --git a/gfx/layers/apz/test/gtest/mvm/TestMobileViewportManager.cpp b/gfx/layers/apz/test/gtest/mvm/TestMobileViewportManager.cpp
new file mode 100644
index 0000000000..cd7e0a7d0d
--- /dev/null
+++ b/gfx/layers/apz/test/gtest/mvm/TestMobileViewportManager.cpp
@@ -0,0 +1,220 @@
+/* -*- 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/. */
+
+#include "gtest/gtest.h"
+#include "gmock/gmock.h"
+
+#include <functional>
+
+#include "MobileViewportManager.h"
+#include "mozilla/MVMContext.h"
+#include "mozilla/dom/Event.h"
+
+using namespace mozilla;
+
+class MockMVMContext : public MVMContext {
+  using AutoSizeFlag = nsViewportInfo::AutoSizeFlag;
+  using AutoScaleFlag = nsViewportInfo::AutoScaleFlag;
+  using ZoomFlag = nsViewportInfo::ZoomFlag;
+
+  // A "layout function" is a function that computes the content size
+  // as a function of the ICB size.
+  using LayoutFunction = std::function<CSSSize(CSSSize aICBSize)>;
+
+ public:
+  // MVMContext methods we don't care to implement.
+  MOCK_METHOD3(AddEventListener,
+               void(const nsAString& aType, nsIDOMEventListener* aListener,
+                    bool aUseCapture));
+  MOCK_METHOD3(RemoveEventListener,
+               void(const nsAString& aType, nsIDOMEventListener* aListener,
+                    bool aUseCapture));
+  MOCK_METHOD3(AddObserver, void(nsIObserver* aObserver, const char* aTopic,
+                                 bool aOwnsWeak));
+  MOCK_METHOD2(RemoveObserver,
+               void(nsIObserver* aObserver, const char* aTopic));
+  MOCK_METHOD0(Destroy, void());
+
+  MOCK_METHOD1(SetVisualViewportSize, void(const CSSSize& aSize));
+  MOCK_METHOD0(PostVisualViewportResizeEventByDynamicToolbar, void());
+  MOCK_METHOD0(UpdateDisplayPortMargins, void());
+
+  void SetMVM(MobileViewportManager* aMVM) { mMVM = aMVM; }
+
+  // MVMContext method implementations.
+  nsViewportInfo GetViewportInfo(const ScreenIntSize& aDisplaySize) const {
+    // This is a very basic approximation of what Document::GetViewportInfo()
+    // does in the most common cases.
+    // Ideally, we would invoke the algorithm in Document::GetViewportInfo()
+    // itself, but that would require refactoring it a bit to remove
+    // dependencies on the actual Document which we don't have available in
+    // this test harness.
+    CSSSize viewportSize = mDisplaySize / mDeviceScale;
+    if (mAutoSizeFlag == AutoSizeFlag::FixedSize) {
+      viewportSize = CSSSize(mFixedViewportWidth,
+                             mFixedViewportWidth * (float(mDisplaySize.height) /
+                                                    mDisplaySize.width));
+    }
+    return nsViewportInfo(mDefaultScale, mMinScale, mMaxScale, viewportSize,
+                          mAutoSizeFlag, mAutoScaleFlag, mZoomFlag,
+                          dom::ViewportFitType::Auto);
+  }
+  CSSToLayoutDeviceScale CSSToDevPixelScale() const { return mDeviceScale; }
+  float GetResolution() const { return mResolution; }
+  bool SubjectMatchesDocument(nsISupports* aSubject) const { return true; }
+  Maybe<CSSRect> CalculateScrollableRectForRSF() const {
+    return Some(CSSRect(CSSPoint(), mContentSize));
+  }
+  bool IsResolutionUpdatedByApz() const { return false; }
+  LayoutDeviceMargin ScrollbarAreaToExcludeFromCompositionBounds() const {
+    return LayoutDeviceMargin();
+  }
+  Maybe<LayoutDeviceIntSize> GetContentViewerSize() const {
+    return Some(mDisplaySize);
+  }
+  bool AllowZoomingForDocument() const { return true; }
+  bool IsInReaderMode() const { return false; }
+  bool IsDocumentLoading() const { return false; }
+
+  void SetResolutionAndScaleTo(float aResolution,
+                               ResolutionChangeOrigin aOrigin) {
+    mResolution = aResolution;
+    mMVM->ResolutionUpdated(aOrigin);
+  }
+  void Reflow(const CSSSize& aNewSize) {
+    mICBSize = aNewSize;
+    mContentSize = mLayoutFunction(mICBSize);
+  }
+
+  // Allow test code to modify the input metrics.
+  void SetMinScale(CSSToScreenScale aMinScale) { mMinScale = aMinScale; }
+  void SetMaxScale(CSSToScreenScale aMaxScale) { mMaxScale = aMaxScale; }
+  void SetInitialScale(CSSToScreenScale aInitialScale) {
+    mDefaultScale = aInitialScale;
+    mAutoScaleFlag = AutoScaleFlag::FixedScale;
+  }
+  void SetFixedViewportWidth(CSSCoord aWidth) {
+    mFixedViewportWidth = aWidth;
+    mAutoSizeFlag = AutoSizeFlag::FixedSize;
+  }
+  void SetDisplaySize(const LayoutDeviceIntSize& aNewDisplaySize) {
+    mDisplaySize = aNewDisplaySize;
+  }
+  void SetLayoutFunction(const LayoutFunction& aLayoutFunction) {
+    mLayoutFunction = aLayoutFunction;
+  }
+
+  // Allow test code to query the output metrics.
+  CSSSize GetICBSize() const { return mICBSize; }
+  CSSSize GetContentSize() const { return mContentSize; }
+
+ private:
+  // Input metrics, with some sensible defaults.
+  LayoutDeviceIntSize mDisplaySize{300, 600};
+  CSSToScreenScale mDefaultScale{1.0f};
+  CSSToScreenScale mMinScale{0.25f};
+  CSSToScreenScale mMaxScale{10.0f};
+  CSSToLayoutDeviceScale mDeviceScale{1.0f};
+  CSSCoord mFixedViewportWidth;
+  AutoSizeFlag mAutoSizeFlag = AutoSizeFlag::AutoSize;
+  AutoScaleFlag mAutoScaleFlag = AutoScaleFlag::AutoScale;
+  ZoomFlag mZoomFlag = ZoomFlag::AllowZoom;
+  // As a default layout function, just set the content size to the ICB size.
+  LayoutFunction mLayoutFunction = [](CSSSize aICBSize) { return aICBSize; };
+
+  // Output metrics.
+  float mResolution = 1.0f;
+  CSSSize mICBSize;
+  CSSSize mContentSize;
+
+  MobileViewportManager* mMVM = nullptr;
+};
+
+class MVMTester : public ::testing::Test {
+ public:
+  MVMTester()
+      : mMVMContext(new MockMVMContext()),
+        mMVM(new MobileViewportManager(
+            mMVMContext,
+            MobileViewportManager::ManagerType::VisualAndMetaViewport)) {
+    mMVMContext->SetMVM(mMVM.get());
+  }
+
+  void Resize(const LayoutDeviceIntSize& aNewDisplaySize) {
+    mMVMContext->SetDisplaySize(aNewDisplaySize);
+    mMVM->RequestReflow(false);
+  }
+
+ protected:
+  RefPtr<MockMVMContext> mMVMContext;
+  RefPtr<MobileViewportManager> mMVM;
+};
+
+TEST_F(MVMTester, ZoomBoundsRespectedAfterRotation_Bug1536755) {
+  // Set up initial conditions.
+  mMVMContext->SetDisplaySize(LayoutDeviceIntSize(600, 300));
+  mMVMContext->SetInitialScale(CSSToScreenScale(1.0f));
+  mMVMContext->SetMinScale(CSSToScreenScale(1.0f));
+  mMVMContext->SetMaxScale(CSSToScreenScale(1.0f));
+  // Set a layout function that simulates a page which is twice
+  // as tall as it is wide.
+  mMVMContext->SetLayoutFunction([](CSSSize aICBSize) {
+    return CSSSize(aICBSize.width, aICBSize.width * 2);
+  });
+
+  // Perform an initial viewport computation and reflow, and
+  // sanity-check the results.
+  mMVM->SetInitialViewport();
+  EXPECT_EQ(CSSSize(600, 300), mMVMContext->GetICBSize());
+  EXPECT_EQ(CSSSize(600, 1200), mMVMContext->GetContentSize());
+  EXPECT_EQ(1.0f, mMVMContext->GetResolution());
+
+  // Now rotate the screen, and check that the minimum and maximum
+  // scales are still respected after the rotation.
+  Resize(LayoutDeviceIntSize(300, 600));
+  EXPECT_EQ(CSSSize(300, 600), mMVMContext->GetICBSize());
+  EXPECT_EQ(CSSSize(300, 600), mMVMContext->GetContentSize());
+  EXPECT_EQ(1.0f, mMVMContext->GetResolution());
+}
+
+TEST_F(MVMTester, LandscapeToPortraitRotation_Bug1523844) {
+  // Set up initial conditions.
+  mMVMContext->SetDisplaySize(LayoutDeviceIntSize(300, 600));
+  // Set a layout function that simulates a page with a fixed
+  // content size that's as wide as the screen in one orientation
+  // (and wider in the other).
+  mMVMContext->SetLayoutFunction(
+      [](CSSSize aICBSize) { return CSSSize(600, 1200); });
+
+  // Simulate a "DOMMetaAdded" event being fired before calling
+  // SetInitialViewport(). This matches what typically happens
+  // during real usage (the MVM receives the "DOMMetaAdded"
+  // before the "load", and it's the "load" that calls
+  // SetInitialViewport()), and is important to trigger this
+  // bug, because it causes the MVM to be stuck with an
+  // "mRestoreResolution" (prior to the fix).
+  mMVM->HandleDOMMetaAdded();
+
+  // Perform an initial viewport computation and reflow, and
+  // sanity-check the results.
+  mMVM->SetInitialViewport();
+  EXPECT_EQ(CSSSize(300, 600), mMVMContext->GetICBSize());
+  EXPECT_EQ(CSSSize(600, 1200), mMVMContext->GetContentSize());
+  EXPECT_EQ(0.5f, mMVMContext->GetResolution());
+
+  // Rotate to landscape.
+  Resize(LayoutDeviceIntSize(600, 300));
+  EXPECT_EQ(CSSSize(600, 300), mMVMContext->GetICBSize());
+  EXPECT_EQ(CSSSize(600, 1200), mMVMContext->GetContentSize());
+  EXPECT_EQ(1.0f, mMVMContext->GetResolution());
+
+  // Rotate back to portrait and check that we have returned
+  // to the portrait resolution.
+  Resize(LayoutDeviceIntSize(300, 600));
+  EXPECT_EQ(CSSSize(300, 600), mMVMContext->GetICBSize());
+  EXPECT_EQ(CSSSize(600, 1200), mMVMContext->GetContentSize());
+  EXPECT_EQ(0.5f, mMVMContext->GetResolution());
+}
diff --git a/gfx/layers/apz/test/gtest/mvm/moz.build b/gfx/layers/apz/test/gtest/mvm/moz.build
new file mode 100644
index 0000000000..0fa985307b
--- /dev/null
+++ b/gfx/layers/apz/test/gtest/mvm/moz.build
@@ -0,0 +1,13 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# 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/.
+
+UNIFIED_SOURCES += [
+    "TestMobileViewportManager.cpp",
+]
+
+include("/ipc/chromium/chromium-config.mozbuild")
+
+FINAL_LIBRARY = "xul-gtest"