1 files changed, 239 insertions, 0 deletions
diff --git a/gfx/layers/apz/test/gtest/TestPanning.cpp b/gfx/layers/apz/test/gtest/TestPanning.cpp
new file mode 100644
index 0000000000..4bfc7f89b6
--- /dev/null
+++ b/gfx/layers/apz/test/gtest/TestPanning.cpp
@@ -0,0 +1,239 @@
+/* -*- 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 "APZCBasicTester.h"
+#include "APZTestCommon.h"
+#include "InputUtils.h"
+#include "gtest/gtest.h"
+
+class APZCPanningTester : public APZCBasicTester {
+ protected:
+  void DoPanTest(bool aShouldTriggerScroll, bool aShouldBeConsumed,
+                 uint32_t aBehavior) {
+    if (aShouldTriggerScroll) {
+      // Three repaint request for each pan.
+      EXPECT_CALL(*mcc, RequestContentRepaint(_)).Times(6);
+    } else {
+      EXPECT_CALL(*mcc, RequestContentRepaint(_)).Times(0);
+    }
+
+    int touchStart = 50;
+    int touchEnd = 10;
+    ParentLayerPoint pointOut;
+    AsyncTransform viewTransformOut;
+
+    nsTArray<uint32_t> allowedTouchBehaviors;
+    allowedTouchBehaviors.AppendElement(aBehavior);
+
+    // Pan down
+    PanAndCheckStatus(apzc, touchStart, touchEnd, aShouldBeConsumed,
+                      &allowedTouchBehaviors);
+    apzc->SampleContentTransformForFrame(&viewTransformOut, pointOut);
+
+    if (aShouldTriggerScroll) {
+      EXPECT_EQ(ParentLayerPoint(0, -(touchEnd - touchStart)), pointOut);
+      EXPECT_NE(AsyncTransform(), viewTransformOut);
+    } else {
+      EXPECT_EQ(ParentLayerPoint(), pointOut);
+      EXPECT_EQ(AsyncTransform(), viewTransformOut);
+    }
+
+    // Clear the fling from the previous pan, or stopping it will
+    // consume the next touchstart
+    apzc->CancelAnimation();
+
+    // Pan back
+    PanAndCheckStatus(apzc, touchEnd, touchStart, aShouldBeConsumed,
+                      &allowedTouchBehaviors);
+    apzc->SampleContentTransformForFrame(&viewTransformOut, pointOut);
+
+    EXPECT_EQ(ParentLayerPoint(), pointOut);
+    EXPECT_EQ(AsyncTransform(), viewTransformOut);
+  }
+
+  void DoPanWithPreventDefaultTest() {
+    MakeApzcWaitForMainThread();
+
+    int touchStart = 50;
+    int touchEnd = 10;
+    ParentLayerPoint pointOut;
+    AsyncTransform viewTransformOut;
+    uint64_t blockId = 0;
+
+    // Pan down
+    nsTArray<uint32_t> allowedTouchBehaviors;
+    allowedTouchBehaviors.AppendElement(
+        mozilla::layers::AllowedTouchBehavior::VERTICAL_PAN);
+    PanAndCheckStatus(apzc, touchStart, touchEnd, true, &allowedTouchBehaviors,
+                      &blockId);
+
+    // Send the signal that content has handled and preventDefaulted the touch
+    // events. This flushes the event queue.
+    apzc->ContentReceivedInputBlock(blockId, true);
+
+    apzc->SampleContentTransformForFrame(&viewTransformOut, pointOut);
+    EXPECT_EQ(ParentLayerPoint(), pointOut);
+    EXPECT_EQ(AsyncTransform(), viewTransformOut);
+
+    apzc->AssertStateIsReset();
+  }
+};
+
+TEST_F(APZCPanningTester, Pan) {
+  SCOPED_GFX_PREF_BOOL("layout.css.touch_action.enabled", false);
+  // Velocity bias can cause extra repaint requests.
+  SCOPED_GFX_PREF_FLOAT("apz.velocity_bias", 0.0);
+  DoPanTest(true, true, mozilla::layers::AllowedTouchBehavior::NONE);
+}
+
+// In the each of the following 4 pan tests we are performing two pan gestures:
+// vertical pan from top to bottom and back - from bottom to top. According to
+// the pointer-events/touch-action spec AUTO and PAN_Y touch-action values allow
+// vertical scrolling while NONE and PAN_X forbid it. The first parameter of
+// DoPanTest method specifies this behavior. However, the events will be marked
+// as consumed even if the behavior in PAN_X, because the user could move their
+// finger horizontally too - APZ has no way of knowing beforehand and so must
+// consume the events.
+TEST_F(APZCPanningTester, PanWithTouchActionAuto) {
+  SCOPED_GFX_PREF_BOOL("layout.css.touch_action.enabled", true);
+  // Velocity bias can cause extra repaint requests.
+  SCOPED_GFX_PREF_FLOAT("apz.velocity_bias", 0.0);
+  DoPanTest(true, true,
+            mozilla::layers::AllowedTouchBehavior::HORIZONTAL_PAN |
+                mozilla::layers::AllowedTouchBehavior::VERTICAL_PAN);
+}
+
+TEST_F(APZCPanningTester, PanWithTouchActionNone) {
+  SCOPED_GFX_PREF_BOOL("layout.css.touch_action.enabled", true);
+  // Velocity bias can cause extra repaint requests.
+  SCOPED_GFX_PREF_FLOAT("apz.velocity_bias", 0.0);
+  DoPanTest(false, false, 0);
+}
+
+TEST_F(APZCPanningTester, PanWithTouchActionPanX) {
+  SCOPED_GFX_PREF_BOOL("layout.css.touch_action.enabled", true);
+  // Velocity bias can cause extra repaint requests.
+  SCOPED_GFX_PREF_FLOAT("apz.velocity_bias", 0.0);
+  DoPanTest(false, false,
+            mozilla::layers::AllowedTouchBehavior::HORIZONTAL_PAN);
+}
+
+TEST_F(APZCPanningTester, PanWithTouchActionPanY) {
+  SCOPED_GFX_PREF_BOOL("layout.css.touch_action.enabled", true);
+  // Velocity bias can cause extra repaint requests.
+  SCOPED_GFX_PREF_FLOAT("apz.velocity_bias", 0.0);
+  DoPanTest(true, true, mozilla::layers::AllowedTouchBehavior::VERTICAL_PAN);
+}
+
+TEST_F(APZCPanningTester, PanWithPreventDefaultAndTouchAction) {
+  SCOPED_GFX_PREF_BOOL("layout.css.touch_action.enabled", true);
+  DoPanWithPreventDefaultTest();
+}
+
+TEST_F(APZCPanningTester, PanWithPreventDefault) {
+  SCOPED_GFX_PREF_BOOL("layout.css.touch_action.enabled", false);
+  DoPanWithPreventDefaultTest();
+}
+
+TEST_F(APZCPanningTester, PanWithHistoricalTouchData) {
+  SCOPED_GFX_PREF_FLOAT("apz.fling_min_velocity_threshold", 0.0);
+
+  // Simulate the same pan gesture, in three different ways.
+  // We start at y=50, with a 50ms resting period at the start of the pan.
+  // Then we accelerate the finger upwards towards y=10, reaching a 10px/10ms
+  // velocity towards the end of the panning motion.
+  //
+  // The first simulation fires touch move events with 10ms gaps.
+  // The second simulation skips two of the touch move events, simulating
+  // "jank". The third simulation also skips those two events, but reports the
+  // missed positions in the following event's historical coordinates.
+  //
+  // Consequently, the first and third simulation should estimate the same
+  // velocities, whereas the second simulation should estimate a different
+  // velocity because it is missing data.
+
+  // First simulation: full data
+
+  APZEventResult result = TouchDown(apzc, ScreenIntPoint(0, 50), mcc->Time());
+  if (result.mStatus != nsEventStatus_eConsumeNoDefault &&
+      StaticPrefs::layout_css_touch_action_enabled()) {
+    SetDefaultAllowedTouchBehavior(apzc, result.mInputBlockId);
+  }
+
+  mcc->AdvanceByMillis(50);
+  result.mStatus = TouchMove(apzc, ScreenIntPoint(0, 45), mcc->Time());
+  mcc->AdvanceByMillis(10);
+  result.mStatus = TouchMove(apzc, ScreenIntPoint(0, 40), mcc->Time());
+  mcc->AdvanceByMillis(10);
+  result.mStatus = TouchMove(apzc, ScreenIntPoint(0, 30), mcc->Time());
+  mcc->AdvanceByMillis(10);
+  result.mStatus = TouchMove(apzc, ScreenIntPoint(0, 20), mcc->Time());
+  result.mStatus = TouchUp(apzc, ScreenIntPoint(0, 20), mcc->Time());
+  auto velocityFromFullDataAsSeparateEvents = apzc->GetVelocityVector();
+  apzc->CancelAnimation();
+
+  mcc->AdvanceByMillis(100);
+
+  // Second simulation: partial data
+
+  result = TouchDown(apzc, ScreenIntPoint(0, 50), mcc->Time());
+  if (result.mStatus != nsEventStatus_eConsumeNoDefault &&
+      StaticPrefs::layout_css_touch_action_enabled()) {
+    SetDefaultAllowedTouchBehavior(apzc, result.mInputBlockId);
+  }
+
+  mcc->AdvanceByMillis(50);
+  result.mStatus = TouchMove(apzc, ScreenIntPoint(0, 45), mcc->Time());
+  mcc->AdvanceByMillis(30);
+  result.mStatus = TouchMove(apzc, ScreenIntPoint(0, 20), mcc->Time());
+  result.mStatus = TouchUp(apzc, ScreenIntPoint(0, 20), mcc->Time());
+  auto velocityFromPartialData = apzc->GetVelocityVector();
+  apzc->CancelAnimation();
+
+  mcc->AdvanceByMillis(100);
+
+  // Third simulation: full data via historical data
+
+  result = TouchDown(apzc, ScreenIntPoint(0, 50), mcc->Time());
+  if (result.mStatus != nsEventStatus_eConsumeNoDefault &&
+      StaticPrefs::layout_css_touch_action_enabled()) {
+    SetDefaultAllowedTouchBehavior(apzc, result.mInputBlockId);
+  }
+
+  mcc->AdvanceByMillis(50);
+  result.mStatus = TouchMove(apzc, ScreenIntPoint(0, 45), mcc->Time());
+  mcc->AdvanceByMillis(30);
+
+  MultiTouchInput mti =
+      CreateMultiTouchInput(MultiTouchInput::MULTITOUCH_MOVE, mcc->Time());
+  auto singleTouchData = CreateSingleTouchData(0, ScreenIntPoint(0, 20));
+  singleTouchData.mHistoricalData.AppendElement(
+      SingleTouchData::HistoricalTouchData{
+          mcc->Time() - TimeDuration::FromMilliseconds(20),
+          ScreenIntPoint(0, 40),
+          {},
+          {},
+          0.0f,
+          0.0f});
+  singleTouchData.mHistoricalData.AppendElement(
+      SingleTouchData::HistoricalTouchData{
+          mcc->Time() - TimeDuration::FromMilliseconds(10),
+          ScreenIntPoint(0, 30),
+          {},
+          {},
+          0.0f,
+          0.0f});
+  mti.mTouches.AppendElement(singleTouchData);
+  result.mStatus = apzc->ReceiveInputEvent(mti).mStatus;
+
+  result.mStatus = TouchUp(apzc, ScreenIntPoint(0, 20), mcc->Time());
+  auto velocityFromFullDataViaHistory = apzc->GetVelocityVector();
+  apzc->CancelAnimation();
+
+  EXPECT_EQ(velocityFromFullDataAsSeparateEvents,
+            velocityFromFullDataViaHistory);
+  EXPECT_NE(velocityFromPartialData, velocityFromFullDataViaHistory);
+}