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gecko-dev/gfx/layers/ipc/AsyncPanZoomController.cpp

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set sw=4 ts=8 et 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 "mozilla/layers/AsyncCompositionManager.h" // for ViewTransform
#include "CompositorParent.h"
#include "mozilla/gfx/2D.h"
#include "mozilla/ClearOnShutdown.h"
#include "mozilla/Constants.h"
#include "mozilla/Util.h"
#include "mozilla/XPCOM.h"
#include "mozilla/Monitor.h"
#include "mozilla/StaticPtr.h"
#include "AsyncPanZoomController.h"
#include "GestureEventListener.h"
#include "nsIThreadManager.h"
#include "nsThreadUtils.h"
#include "Layers.h"
#include "AnimationCommon.h"
#include <algorithm>
#include "mozilla/layers/LayerManagerComposite.h"
using namespace mozilla::css;
namespace mozilla {
namespace layers {
/**
* Constant describing the tolerance in distance we use, multiplied by the
* device DPI, before we start panning the screen. This is to prevent us from
* accidentally processing taps as touch moves, and from very short/accidental
* touches moving the screen.
*/
static float gTouchStartTolerance = 1.0f/16.0f;
static const float EPSILON = 0.0001;
/**
* Maximum amount of time while panning before sending a viewport change. This
* will asynchronously repaint the page. It is also forced when panning stops.
*/
static int32_t gPanRepaintInterval = 250;
/**
* Maximum amount of time flinging before sending a viewport change. This will
* asynchronously repaint the page.
*/
static int32_t gFlingRepaintInterval = 75;
/**
* Minimum amount of speed along an axis before we begin painting far ahead by
* adjusting the displayport.
*/
static float gMinSkateSpeed = 0.7f;
/**
* Duration of a zoom to animation.
*/
static const TimeDuration ZOOM_TO_DURATION = TimeDuration::FromSeconds(0.25);
/**
* Computed time function used for sampling frames of a zoom to animation.
*/
StaticAutoPtr<ComputedTimingFunction> gComputedTimingFunction;
/**
* Maximum zoom amount, always used, even if a page asks for higher.
*/
static const float MAX_ZOOM = 8.0f;
/**
* Minimum zoom amount, always used, even if a page asks for lower.
*/
static const float MIN_ZOOM = 0.125f;
/**
* Amount of time before we timeout touch event listeners. For example, if
* content is being unruly/slow and we don't get a response back within this
* time, we will just pretend that content did not preventDefault any touch
* events we dispatched to it.
*/
static int gTouchListenerTimeout = 300;
/**
* Number of samples to store of how long it took to paint after the previous
* requests.
*/
static int gNumPaintDurationSamples = 3;
/** The multiplier we apply to a dimension's length if it is skating. That is,
* if it's going above sMinSkateSpeed. We prefer to increase the size of the
* Y axis because it is more natural in the case that a user is reading a page
* that scrolls up/down. Note that one, both or neither of these may be used
* at any instant.
*/
static float gXSkateSizeMultiplier = 3.0f;
static float gYSkateSizeMultiplier = 3.5f;
/** The multiplier we apply to a dimension's length if it is stationary. We
* prefer to increase the size of the Y axis because it is more natural in the
* case that a user is reading a page that scrolls up/down. Note that one,
* both or neither of these may be used at any instant.
*/
static float gXStationarySizeMultiplier = 1.5f;
static float gYStationarySizeMultiplier = 2.5f;
static TimeStamp sFrameTime;
static TimeStamp
GetFrameTime() {
if (sFrameTime.IsNull()) {
return TimeStamp::Now();
}
return sFrameTime;
}
void
AsyncPanZoomController::SetFrameTime(const TimeStamp& aTime) {
sFrameTime = aTime;
}
static void ReadAZPCPrefs()
{
Preferences::AddIntVarCache(&gPanRepaintInterval, "gfx.azpc.pan_repaint_interval", gPanRepaintInterval);
Preferences::AddIntVarCache(&gFlingRepaintInterval, "gfx.azpc.fling_repaint_interval", gFlingRepaintInterval);
Preferences::AddFloatVarCache(&gMinSkateSpeed, "gfx.azpc.min_skate_speed", gMinSkateSpeed);
Preferences::AddIntVarCache(&gTouchListenerTimeout, "gfx.azpc.touch_listener_timeout", gTouchListenerTimeout);
Preferences::AddIntVarCache(&gNumPaintDurationSamples, "gfx.azpc.num_paint_duration_samples", gNumPaintDurationSamples);
Preferences::AddFloatVarCache(&gTouchStartTolerance, "gfx.azpc.touch_start_tolerance", gTouchStartTolerance);
Preferences::AddFloatVarCache(&gXSkateSizeMultiplier, "gfx.azpc.x_skate_size_multiplier", gXSkateSizeMultiplier);
Preferences::AddFloatVarCache(&gYSkateSizeMultiplier, "gfx.azpc.y_skate_size_multiplier", gYSkateSizeMultiplier);
Preferences::AddFloatVarCache(&gXStationarySizeMultiplier, "gfx.azpc.x_stationary_size_multiplier", gXStationarySizeMultiplier);
Preferences::AddFloatVarCache(&gYStationarySizeMultiplier, "gfx.azpc.y_stationary_size_multiplier", gYStationarySizeMultiplier);
}
class ReadAZPCPref MOZ_FINAL : public nsRunnable {
public:
NS_IMETHOD Run()
{
ReadAZPCPrefs();
return NS_OK;
}
};
static void InitAZPCPrefs()
{
static bool sInitialized = false;
if (sInitialized)
return;
sInitialized = true;
if (NS_IsMainThread()) {
ReadAZPCPrefs();
} else {
// We have to dispatch an event to the main thread to read the pref.
NS_DispatchToMainThread(new ReadAZPCPref());
}
}
AsyncPanZoomController::AsyncPanZoomController(GeckoContentController* aGeckoContentController,
GestureBehavior aGestures)
: mGeckoContentController(aGeckoContentController),
mTouchListenerTimeoutTask(nullptr),
mX(this),
mY(this),
mAllowZoom(true),
mMinZoom(MIN_ZOOM),
mMaxZoom(MAX_ZOOM),
mMonitor("AsyncPanZoomController"),
mLastSampleTime(GetFrameTime()),
mState(NOTHING),
mPreviousPaintStartTime(GetFrameTime()),
mLastAsyncScrollTime(GetFrameTime()),
mLastAsyncScrollOffset(0, 0),
mCurrentAsyncScrollOffset(0, 0),
mAsyncScrollTimeoutTask(nullptr),
mAsyncScrollThrottleTime(100),
mAsyncScrollTimeout(300),
mDPI(72),
mWaitingForContentToPaint(false),
mDisableNextTouchBatch(false),
mHandlingTouchQueue(false),
mDelayPanning(false)
{
MOZ_ASSERT(NS_IsMainThread());
InitAZPCPrefs();
if (aGestures == USE_GESTURE_DETECTOR) {
mGestureEventListener = new GestureEventListener(this);
}
SetDPI(mDPI);
if (!gComputedTimingFunction) {
gComputedTimingFunction = new ComputedTimingFunction();
gComputedTimingFunction->Init(
nsTimingFunction(NS_STYLE_TRANSITION_TIMING_FUNCTION_EASE));
ClearOnShutdown(&gComputedTimingFunction);
}
Preferences::GetUint("apzc.asyncscroll.throttle", &mAsyncScrollThrottleTime);
Preferences::GetUint("apzc.asyncscroll.timeout", &mAsyncScrollTimeout);
}
AsyncPanZoomController::~AsyncPanZoomController() {
}
void
AsyncPanZoomController::Destroy()
{
// These memebrs can only be used on the controller/UI thread.
mGeckoContentController = nullptr;
mGestureEventListener = nullptr;
}
/* static */float
AsyncPanZoomController::GetTouchStartTolerance()
{
return gTouchStartTolerance;
}
static CSSPoint
WidgetSpaceToCompensatedViewportSpace(const ScreenPoint& aPoint,
const CSSToScreenScale& aCurrentZoom)
{
// Transform the input point from local widget space to the content document
// space that the user is seeing, from last composite.
// FIXME/bug 775451: this doesn't attempt to compensate for content transforms
// in effect on the compositor. The problem is that it's very hard for us to
// know what content CSS pixel is at widget point 0,0 based on information
// available here. So we use this hacky implementation for now, which works
// in quiescent states.
return aPoint / aCurrentZoom;
}
nsEventStatus
AsyncPanZoomController::ReceiveInputEvent(const nsInputEvent& aEvent,
nsInputEvent* aOutEvent)
{
CSSToScreenScale currentResolution;
{
MonitorAutoLock monitor(mMonitor);
currentResolution = mFrameMetrics.CalculateResolution();
}
nsEventStatus status;
switch (aEvent.eventStructType) {
case NS_TOUCH_EVENT: {
MultiTouchInput event(static_cast<const nsTouchEvent&>(aEvent));
status = ReceiveInputEvent(event);
break;
}
case NS_MOUSE_EVENT: {
MultiTouchInput event(static_cast<const nsMouseEvent&>(aEvent));
status = ReceiveInputEvent(event);
break;
}
default:
status = nsEventStatus_eIgnore;
break;
}
switch (aEvent.eventStructType) {
case NS_TOUCH_EVENT: {
nsTouchEvent* touchEvent = static_cast<nsTouchEvent*>(aOutEvent);
const nsTArray<nsCOMPtr<nsIDOMTouch> >& touches = touchEvent->touches;
for (uint32_t i = 0; i < touches.Length(); ++i) {
nsIDOMTouch* touch = touches[i];
if (touch) {
CSSPoint refPoint = WidgetSpaceToCompensatedViewportSpace(
ScreenPoint::FromUnknownPoint(gfx::Point(
touch->mRefPoint.x, touch->mRefPoint.y)),
currentResolution);
touch->mRefPoint = nsIntPoint(refPoint.x, refPoint.y);
}
}
break;
}
default: {
CSSPoint refPoint = WidgetSpaceToCompensatedViewportSpace(
ScreenPoint::FromUnknownPoint(gfx::Point(
aOutEvent->refPoint.x, aOutEvent->refPoint.y)),
currentResolution);
aOutEvent->refPoint = nsIntPoint(refPoint.x, refPoint.y);
break;
}
}
return status;
}
nsEventStatus AsyncPanZoomController::ReceiveInputEvent(const InputData& aEvent) {
// If we may have touch listeners, we enable the machinery that allows touch
// listeners to preventDefault any touch inputs. This should not happen unless
// there are actually touch listeners as it introduces potentially unbounded
// lag because it causes a round-trip through content. Usually, if content is
// responding in a timely fashion, this only introduces a nearly constant few
// hundred ms of lag.
if (mFrameMetrics.mMayHaveTouchListeners && aEvent.mInputType == MULTITOUCH_INPUT &&
(mState == NOTHING || mState == TOUCHING || mState == PANNING)) {
const MultiTouchInput& multiTouchInput = aEvent.AsMultiTouchInput();
if (multiTouchInput.mType == MultiTouchInput::MULTITOUCH_START) {
SetState(WAITING_LISTENERS);
}
}
if (mState == WAITING_LISTENERS || mHandlingTouchQueue) {
if (aEvent.mInputType == MULTITOUCH_INPUT) {
const MultiTouchInput& multiTouchInput = aEvent.AsMultiTouchInput();
mTouchQueue.AppendElement(multiTouchInput);
if (!mTouchListenerTimeoutTask) {
mTouchListenerTimeoutTask =
NewRunnableMethod(this, &AsyncPanZoomController::TimeoutTouchListeners);
PostDelayedTask(mTouchListenerTimeoutTask, gTouchListenerTimeout);
}
}
return nsEventStatus_eConsumeNoDefault;
}
return HandleInputEvent(aEvent);
}
nsEventStatus AsyncPanZoomController::HandleInputEvent(const InputData& aEvent) {
nsEventStatus rv = nsEventStatus_eIgnore;
if (mGestureEventListener && !mDisableNextTouchBatch) {
rv = mGestureEventListener->HandleInputEvent(aEvent);
if (rv == nsEventStatus_eConsumeNoDefault)
return rv;
}
if (mDelayPanning && aEvent.mInputType == MULTITOUCH_INPUT) {
const MultiTouchInput& multiTouchInput = aEvent.AsMultiTouchInput();
if (multiTouchInput.mType == MultiTouchInput::MULTITOUCH_MOVE) {
// Let BrowserElementScrolling perform panning gesture first.
SetState(WAITING_LISTENERS);
mTouchQueue.AppendElement(multiTouchInput);
if (!mTouchListenerTimeoutTask) {
mTouchListenerTimeoutTask =
NewRunnableMethod(this, &AsyncPanZoomController::TimeoutTouchListeners);
PostDelayedTask(mTouchListenerTimeoutTask, gTouchListenerTimeout);
}
return nsEventStatus_eConsumeNoDefault;
}
}
switch (aEvent.mInputType) {
case MULTITOUCH_INPUT: {
const MultiTouchInput& multiTouchInput = aEvent.AsMultiTouchInput();
switch (multiTouchInput.mType) {
case MultiTouchInput::MULTITOUCH_START: rv = OnTouchStart(multiTouchInput); break;
case MultiTouchInput::MULTITOUCH_MOVE: rv = OnTouchMove(multiTouchInput); break;
case MultiTouchInput::MULTITOUCH_END: rv = OnTouchEnd(multiTouchInput); break;
case MultiTouchInput::MULTITOUCH_CANCEL: rv = OnTouchCancel(multiTouchInput); break;
default: NS_WARNING("Unhandled multitouch"); break;
}
break;
}
case PINCHGESTURE_INPUT: {
const PinchGestureInput& pinchGestureInput = aEvent.AsPinchGestureInput();
switch (pinchGestureInput.mType) {
case PinchGestureInput::PINCHGESTURE_START: rv = OnScaleBegin(pinchGestureInput); break;
case PinchGestureInput::PINCHGESTURE_SCALE: rv = OnScale(pinchGestureInput); break;
case PinchGestureInput::PINCHGESTURE_END: rv = OnScaleEnd(pinchGestureInput); break;
default: NS_WARNING("Unhandled pinch gesture"); break;
}
break;
}
case TAPGESTURE_INPUT: {
const TapGestureInput& tapGestureInput = aEvent.AsTapGestureInput();
switch (tapGestureInput.mType) {
case TapGestureInput::TAPGESTURE_LONG: rv = OnLongPress(tapGestureInput); break;
case TapGestureInput::TAPGESTURE_UP: rv = OnSingleTapUp(tapGestureInput); break;
case TapGestureInput::TAPGESTURE_CONFIRMED: rv = OnSingleTapConfirmed(tapGestureInput); break;
case TapGestureInput::TAPGESTURE_DOUBLE: rv = OnDoubleTap(tapGestureInput); break;
case TapGestureInput::TAPGESTURE_CANCEL: rv = OnCancelTap(tapGestureInput); break;
default: NS_WARNING("Unhandled tap gesture"); break;
}
break;
}
default: NS_WARNING("Unhandled input event"); break;
}
mLastEventTime = aEvent.mTime;
return rv;
}
nsEventStatus AsyncPanZoomController::OnTouchStart(const MultiTouchInput& aEvent) {
SingleTouchData& touch = GetFirstSingleTouch(aEvent);
ScreenIntPoint point = touch.mScreenPoint;
switch (mState) {
case ANIMATING_ZOOM:
// We just interrupted a double-tap animation, so force a redraw in case
// this touchstart is just a tap that doesn't end up triggering a redraw.
{
MonitorAutoLock monitor(mMonitor);
// Bring the resolution back in sync with the zoom.
SetZoomAndResolution(mFrameMetrics.mZoom);
RequestContentRepaint();
ScheduleComposite();
}
// Fall through.
case FLING:
CancelAnimation();
// Fall through.
case NOTHING:
mX.StartTouch(point.x);
mY.StartTouch(point.y);
SetState(TOUCHING);
break;
case TOUCHING:
case PANNING:
case PINCHING:
case WAITING_LISTENERS:
NS_WARNING("Received impossible touch in OnTouchStart");
break;
default:
NS_WARNING("Unhandled case in OnTouchStart");
break;
}
return nsEventStatus_eConsumeNoDefault;
}
nsEventStatus AsyncPanZoomController::OnTouchMove(const MultiTouchInput& aEvent) {
if (mDisableNextTouchBatch) {
return nsEventStatus_eIgnore;
}
switch (mState) {
case FLING:
case NOTHING:
case ANIMATING_ZOOM:
// May happen if the user double-taps and drags without lifting after the
// second tap. Ignore the move if this happens.
return nsEventStatus_eIgnore;
case TOUCHING: {
float panThreshold = gTouchStartTolerance * mDPI;
UpdateWithTouchAtDevicePoint(aEvent);
if (PanDistance() < panThreshold) {
return nsEventStatus_eIgnore;
}
StartPanning(aEvent);
return nsEventStatus_eConsumeNoDefault;
}
case PANNING:
TrackTouch(aEvent);
return nsEventStatus_eConsumeNoDefault;
case PINCHING:
// The scale gesture listener should have handled this.
NS_WARNING("Gesture listener should have handled pinching in OnTouchMove.");
return nsEventStatus_eIgnore;
case WAITING_LISTENERS:
NS_WARNING("Received impossible touch in OnTouchMove");
break;
}
return nsEventStatus_eConsumeNoDefault;
}
nsEventStatus AsyncPanZoomController::OnTouchEnd(const MultiTouchInput& aEvent) {
if (mDisableNextTouchBatch) {
mDisableNextTouchBatch = false;
return nsEventStatus_eIgnore;
}
{
MonitorAutoLock monitor(mMonitor);
SendAsyncScrollEvent();
}
switch (mState) {
case FLING:
// Should never happen.
NS_WARNING("Received impossible touch end in OnTouchEnd.");
// Fall through.
case ANIMATING_ZOOM:
case NOTHING:
// May happen if the user double-taps and drags without lifting after the
// second tap. Ignore if this happens.
return nsEventStatus_eIgnore;
case TOUCHING:
SetState(NOTHING);
return nsEventStatus_eIgnore;
case PANNING:
{
MonitorAutoLock monitor(mMonitor);
ScheduleComposite();
RequestContentRepaint();
}
mX.EndTouch();
mY.EndTouch();
SetState(FLING);
return nsEventStatus_eConsumeNoDefault;
case PINCHING:
SetState(NOTHING);
// Scale gesture listener should have handled this.
NS_WARNING("Gesture listener should have handled pinching in OnTouchEnd.");
return nsEventStatus_eIgnore;
case WAITING_LISTENERS:
NS_WARNING("Received impossible touch in OnTouchEnd");
break;
}
return nsEventStatus_eConsumeNoDefault;
}
nsEventStatus AsyncPanZoomController::OnTouchCancel(const MultiTouchInput& aEvent) {
SetState(NOTHING);
return nsEventStatus_eConsumeNoDefault;
}
nsEventStatus AsyncPanZoomController::OnScaleBegin(const PinchGestureInput& aEvent) {
if (!mAllowZoom) {
return nsEventStatus_eConsumeNoDefault;
}
SetState(PINCHING);
mLastZoomFocus = aEvent.mFocusPoint;
return nsEventStatus_eConsumeNoDefault;
}
nsEventStatus AsyncPanZoomController::OnScale(const PinchGestureInput& aEvent) {
if (mState != PINCHING) {
return nsEventStatus_eConsumeNoDefault;
}
float prevSpan = aEvent.mPreviousSpan;
if (fabsf(prevSpan) <= EPSILON || fabsf(aEvent.mCurrentSpan) <= EPSILON) {
// We're still handling it; we've just decided to throw this event away.
return nsEventStatus_eConsumeNoDefault;
}
float spanRatio = aEvent.mCurrentSpan / aEvent.mPreviousSpan;
{
MonitorAutoLock monitor(mMonitor);
CSSToScreenScale resolution = mFrameMetrics.CalculateResolution();
gfxFloat userZoom = mFrameMetrics.mZoom.scale;
ScreenPoint focusPoint = aEvent.mFocusPoint;
CSSPoint focusChange = (mLastZoomFocus - focusPoint) / resolution;
// If displacing by the change in focus point will take us off page bounds,
// then reduce the displacement such that it doesn't.
if (mX.DisplacementWillOverscroll(focusChange.x) != Axis::OVERSCROLL_NONE) {
focusChange.x -= mX.DisplacementWillOverscrollAmount(focusChange.x);
}
if (mY.DisplacementWillOverscroll(focusChange.y) != Axis::OVERSCROLL_NONE) {
focusChange.y -= mY.DisplacementWillOverscrollAmount(focusChange.y);
}
ScrollBy(focusChange);
// When we zoom in with focus, we can zoom too much towards the boundaries
// that we actually go over them. These are the needed displacements along
// either axis such that we don't overscroll the boundaries when zooming.
gfx::Point neededDisplacement;
float maxZoom = mMaxZoom / mFrameMetrics.CalculateIntrinsicScale().scale;
float minZoom = mMinZoom / mFrameMetrics.CalculateIntrinsicScale().scale;
bool doScale = (spanRatio > 1.0 && userZoom < maxZoom) ||
(spanRatio < 1.0 && userZoom > minZoom);
if (doScale) {
if (userZoom * spanRatio > maxZoom) {
spanRatio = maxZoom / userZoom;
} else if (userZoom * spanRatio < minZoom) {
spanRatio = minZoom / userZoom;
}
switch (mX.ScaleWillOverscroll(spanRatio, focusPoint.x))
{
case Axis::OVERSCROLL_NONE:
break;
case Axis::OVERSCROLL_MINUS:
case Axis::OVERSCROLL_PLUS:
neededDisplacement.x = -mX.ScaleWillOverscrollAmount(spanRatio, focusPoint.x);
break;
case Axis::OVERSCROLL_BOTH:
// If scaling this way will make us overscroll in both directions, then
// we must already be at the maximum zoomed out amount. In this case, we
// don't want to allow this scaling to go through and instead clamp it
// here.
doScale = false;
break;
}
}
if (doScale) {
switch (mY.ScaleWillOverscroll(spanRatio, focusPoint.y))
{
case Axis::OVERSCROLL_NONE:
break;
case Axis::OVERSCROLL_MINUS:
case Axis::OVERSCROLL_PLUS:
neededDisplacement.y = -mY.ScaleWillOverscrollAmount(spanRatio, focusPoint.y);
break;
case Axis::OVERSCROLL_BOTH:
doScale = false;
break;
}
}
if (doScale) {
ScaleWithFocus(userZoom * spanRatio, focusPoint);
if (neededDisplacement != gfx::Point()) {
ScrollBy(CSSPoint::FromUnknownPoint(neededDisplacement));
}
ScheduleComposite();
// We don't want to redraw on every scale, so don't use
// RequestContentRepaint()
}
mLastZoomFocus = focusPoint;
}
return nsEventStatus_eConsumeNoDefault;
}
nsEventStatus AsyncPanZoomController::OnScaleEnd(const PinchGestureInput& aEvent) {
SetState(PANNING);
mX.StartTouch(aEvent.mFocusPoint.x);
mY.StartTouch(aEvent.mFocusPoint.y);
{
MonitorAutoLock monitor(mMonitor);
ScheduleComposite();
RequestContentRepaint();
}
return nsEventStatus_eConsumeNoDefault;
}
nsEventStatus AsyncPanZoomController::OnLongPress(const TapGestureInput& aEvent) {
if (mGeckoContentController) {
MonitorAutoLock monitor(mMonitor);
CSSToScreenScale resolution = mFrameMetrics.CalculateResolution();
CSSPoint point = WidgetSpaceToCompensatedViewportSpace(
ScreenPoint::FromUnknownPoint(gfx::Point(
aEvent.mPoint.x, aEvent.mPoint.y)),
resolution);
mGeckoContentController->HandleLongTap(gfx::RoundedToInt(point));
return nsEventStatus_eConsumeNoDefault;
}
return nsEventStatus_eIgnore;
}
nsEventStatus AsyncPanZoomController::OnSingleTapUp(const TapGestureInput& aEvent) {
return nsEventStatus_eIgnore;
}
nsEventStatus AsyncPanZoomController::OnSingleTapConfirmed(const TapGestureInput& aEvent) {
if (mGeckoContentController) {
MonitorAutoLock monitor(mMonitor);
CSSToScreenScale resolution = mFrameMetrics.CalculateResolution();
CSSPoint point = WidgetSpaceToCompensatedViewportSpace(
ScreenPoint::FromUnknownPoint(gfx::Point(
aEvent.mPoint.x, aEvent.mPoint.y)),
resolution);
mGeckoContentController->HandleSingleTap(gfx::RoundedToInt(point));
return nsEventStatus_eConsumeNoDefault;
}
return nsEventStatus_eIgnore;
}
nsEventStatus AsyncPanZoomController::OnDoubleTap(const TapGestureInput& aEvent) {
if (mGeckoContentController) {
MonitorAutoLock monitor(mMonitor);
if (mAllowZoom) {
CSSToScreenScale resolution = mFrameMetrics.CalculateResolution();
CSSPoint point = WidgetSpaceToCompensatedViewportSpace(
ScreenPoint::FromUnknownPoint(gfx::Point(
aEvent.mPoint.x, aEvent.mPoint.y)),
resolution);
mGeckoContentController->HandleDoubleTap(gfx::RoundedToInt(point));
}
return nsEventStatus_eConsumeNoDefault;
}
return nsEventStatus_eIgnore;
}
nsEventStatus AsyncPanZoomController::OnCancelTap(const TapGestureInput& aEvent) {
// XXX: Implement this.
return nsEventStatus_eIgnore;
}
float AsyncPanZoomController::PanDistance() {
MonitorAutoLock monitor(mMonitor);
return NS_hypot(mX.PanDistance(), mY.PanDistance());
}
const gfx::Point AsyncPanZoomController::GetVelocityVector() {
return gfx::Point(mX.GetVelocity(), mY.GetVelocity());
}
const gfx::Point AsyncPanZoomController::GetAccelerationVector() {
return gfx::Point(mX.GetAccelerationFactor(), mY.GetAccelerationFactor());
}
void AsyncPanZoomController::StartPanning(const MultiTouchInput& aEvent) {
float dx = mX.PanDistance(),
dy = mY.PanDistance();
double angle = atan2(dy, dx); // range [-pi, pi]
angle = fabs(angle); // range [0, pi]
SetState(PANNING);
}
void AsyncPanZoomController::UpdateWithTouchAtDevicePoint(const MultiTouchInput& aEvent) {
SingleTouchData& touch = GetFirstSingleTouch(aEvent);
ScreenIntPoint point = touch.mScreenPoint;
TimeDuration timeDelta = TimeDuration().FromMilliseconds(aEvent.mTime - mLastEventTime);
// Probably a duplicate event, just throw it away.
if (timeDelta.ToMilliseconds() <= EPSILON) {
return;
}
mX.UpdateWithTouchAtDevicePoint(point.x, timeDelta);
mY.UpdateWithTouchAtDevicePoint(point.y, timeDelta);
}
void AsyncPanZoomController::TrackTouch(const MultiTouchInput& aEvent) {
TimeDuration timeDelta = TimeDuration().FromMilliseconds(aEvent.mTime - mLastEventTime);
// Probably a duplicate event, just throw it away.
if (timeDelta.ToMilliseconds() <= EPSILON) {
return;
}
UpdateWithTouchAtDevicePoint(aEvent);
{
MonitorAutoLock monitor(mMonitor);
// We want to inversely scale it because when you're zoomed further in, a
// larger swipe should move you a shorter distance.
ScreenToCSSScale inverseResolution = mFrameMetrics.CalculateResolution().Inverse();
gfx::Point displacement(mX.GetDisplacementForDuration(inverseResolution.scale,
timeDelta),
mY.GetDisplacementForDuration(inverseResolution.scale,
timeDelta));
if (fabs(displacement.x) <= EPSILON && fabs(displacement.y) <= EPSILON) {
return;
}
ScrollBy(CSSPoint::FromUnknownPoint(displacement));
ScheduleComposite();
TimeDuration timePaintDelta = GetFrameTime() - mPreviousPaintStartTime;
if (timePaintDelta.ToMilliseconds() > gPanRepaintInterval) {
RequestContentRepaint();
}
}
}
SingleTouchData& AsyncPanZoomController::GetFirstSingleTouch(const MultiTouchInput& aEvent) {
return (SingleTouchData&)aEvent.mTouches[0];
}
bool AsyncPanZoomController::DoFling(const TimeDuration& aDelta) {
if (mState != FLING) {
return false;
}
bool shouldContinueFlingX = mX.FlingApplyFrictionOrCancel(aDelta),
shouldContinueFlingY = mY.FlingApplyFrictionOrCancel(aDelta);
// If we shouldn't continue the fling, let's just stop and repaint.
if (!shouldContinueFlingX && !shouldContinueFlingY) {
// Bring the resolution back in sync with the zoom, in case we scaled down
// the zoom while accelerating.
SetZoomAndResolution(mFrameMetrics.mZoom);
SendAsyncScrollEvent();
RequestContentRepaint();
mState = NOTHING;
return false;
}
// We want to inversely scale it because when you're zoomed further in, a
// larger swipe should move you a shorter distance.
ScreenToCSSScale inverseResolution = mFrameMetrics.CalculateResolution().Inverse();
ScrollBy(CSSPoint::FromUnknownPoint(gfx::Point(
mX.GetDisplacementForDuration(inverseResolution.scale, aDelta),
mY.GetDisplacementForDuration(inverseResolution.scale, aDelta)
)));
TimeDuration timePaintDelta = GetFrameTime() - mPreviousPaintStartTime;
if (timePaintDelta.ToMilliseconds() > gFlingRepaintInterval) {
RequestContentRepaint();
}
return true;
}
void AsyncPanZoomController::CancelAnimation() {
mState = NOTHING;
}
void AsyncPanZoomController::SetCompositorParent(CompositorParent* aCompositorParent) {
mCompositorParent = aCompositorParent;
}
void AsyncPanZoomController::ScrollBy(const CSSPoint& aOffset) {
mFrameMetrics.mScrollOffset += aOffset;
}
void AsyncPanZoomController::ScaleWithFocus(float aZoom,
const ScreenPoint& aFocus) {
float zoomFactor = aZoom / mFrameMetrics.mZoom.scale;
CSSToScreenScale resolution = mFrameMetrics.CalculateResolution();
SetZoomAndResolution(ScreenToScreenScale(aZoom));
// If the new scale is very small, we risk multiplying in huge rounding
// errors, so don't bother adjusting the scroll offset.
if (resolution.scale >= 0.01f) {
mFrameMetrics.mScrollOffset.x +=
aFocus.x * (zoomFactor - 1.0) / resolution.scale;
mFrameMetrics.mScrollOffset.y +=
aFocus.y * (zoomFactor - 1.0) / resolution.scale;
}
}
bool AsyncPanZoomController::EnlargeDisplayPortAlongAxis(float aSkateSizeMultiplier,
double aEstimatedPaintDuration,
float aCompositionBounds,
float aVelocity,
float aAcceleration,
float* aDisplayPortOffset,
float* aDisplayPortLength)
{
if (fabsf(aVelocity) > gMinSkateSpeed) {
// Enlarge the area we paint.
*aDisplayPortLength = aCompositionBounds * aSkateSizeMultiplier;
// Position the area we paint such that all of the excess that extends past
// the screen is on the side towards the velocity.
*aDisplayPortOffset = aVelocity > 0 ? 0 : aCompositionBounds - *aDisplayPortLength;
// Only compensate for acceleration when we actually have any. Otherwise
// we'll overcompensate when a user is just panning around without flinging.
if (aAcceleration > 1.01f) {
// Compensate for acceleration and how long we expect a paint to take. We
// try to predict where the viewport will be when painting has finished.
*aDisplayPortOffset +=
fabsf(aAcceleration) * aVelocity * aCompositionBounds * aEstimatedPaintDuration;
// If our velocity is in the negative direction of the axis, we have to
// compensate for the fact that our scroll offset is the top-left position
// of the viewport. In this case, let's make it relative to the
// bottom-right. That way, we'll always be growing the displayport upwards
// and to the left when skating negatively.
*aDisplayPortOffset -= aVelocity < 0 ? aCompositionBounds : 0;
}
return true;
}
return false;
}
const CSSRect AsyncPanZoomController::CalculatePendingDisplayPort(
const FrameMetrics& aFrameMetrics,
const gfx::Point& aVelocity,
const gfx::Point& aAcceleration,
double aEstimatedPaintDuration)
{
// If we don't get an estimated paint duration, we probably don't have any
// data. In this case, we're dealing with either a stationary frame or a first
// paint. In either of these cases, we can just assume it'll take 1 second to
// paint. Getting this correct is not important anyways since it's only really
// useful when accelerating, which can't be happening at this point.
double estimatedPaintDuration =
aEstimatedPaintDuration > EPSILON ? aEstimatedPaintDuration : 1.0;
CSSToScreenScale resolution = aFrameMetrics.CalculateResolution();
CSSIntRect compositionBounds = gfx::RoundedIn(aFrameMetrics.mCompositionBounds / resolution);
CSSRect scrollableRect = aFrameMetrics.mScrollableRect;
// Ensure the scrollableRect is at least as big as the compositionBounds
// because the scrollableRect can be smaller if the content is not large
// and the scrollableRect hasn't been updated yet.
// We move the scrollableRect up because we don't know if we can move it
// down. i.e. we know that scrollableRect can go back as far as zero.
// but we don't know how much further ahead it can go.
if (scrollableRect.width < compositionBounds.width) {
scrollableRect.x = std::max(0.f,
scrollableRect.x - (compositionBounds.width - scrollableRect.width));
scrollableRect.width = compositionBounds.width;
}
if (scrollableRect.height < compositionBounds.height) {
scrollableRect.y = std::max(0.f,
scrollableRect.y - (compositionBounds.height - scrollableRect.height));
scrollableRect.height = compositionBounds.height;
}
CSSPoint scrollOffset = aFrameMetrics.mScrollOffset;
CSSRect displayPort = CSSRect(compositionBounds);
displayPort.MoveTo(0, 0);
displayPort.Scale(gXStationarySizeMultiplier, gYStationarySizeMultiplier);
// If there's motion along an axis of movement, and it's above a threshold,
// then we want to paint a larger area in the direction of that motion so that
// it's less likely to checkerboard.
bool enlargedX = EnlargeDisplayPortAlongAxis(
gXSkateSizeMultiplier, estimatedPaintDuration,
compositionBounds.width, aVelocity.x, aAcceleration.x,
&displayPort.x, &displayPort.width);
bool enlargedY = EnlargeDisplayPortAlongAxis(
gYSkateSizeMultiplier, estimatedPaintDuration,
compositionBounds.height, aVelocity.y, aAcceleration.y,
&displayPort.y, &displayPort.height);
if (!enlargedX && !enlargedY) {
// Position the x and y such that the screen falls in the middle of the displayport.
displayPort.x = -(displayPort.width - compositionBounds.width) / 2;
displayPort.y = -(displayPort.height - compositionBounds.height) / 2;
} else if (!enlargedX) {
displayPort.width = compositionBounds.width;
} else if (!enlargedY) {
displayPort.height = compositionBounds.height;
}
// If we go over the bounds when trying to predict where we will be when this
// paint finishes, move it back into the range of the CSS content rect.
// FIXME/bug 780395: Generalize this. This code is pretty hacky as it will
// probably not work at all for RTL content. This is not intended to be
// incredibly accurate; it'll just prevent the entire displayport from being
// outside the content rect (which causes bad things to happen).
if (scrollOffset.x + compositionBounds.width > scrollableRect.width) {
scrollOffset.x -= compositionBounds.width + scrollOffset.x - scrollableRect.width;
} else if (scrollOffset.x < scrollableRect.x) {
scrollOffset.x = scrollableRect.x;
}
if (scrollOffset.y + compositionBounds.height > scrollableRect.height) {
scrollOffset.y -= compositionBounds.height + scrollOffset.y - scrollableRect.height;
} else if (scrollOffset.y < scrollableRect.y) {
scrollOffset.y = scrollableRect.y;
}
CSSRect shiftedDisplayPort = displayPort + scrollOffset;
return scrollableRect.ClampRect(shiftedDisplayPort) - scrollOffset;
}
void AsyncPanZoomController::SetDPI(int aDPI) {
mDPI = aDPI;
}
int AsyncPanZoomController::GetDPI() {
return mDPI;
}
void AsyncPanZoomController::ScheduleComposite() {
if (mCompositorParent) {
mCompositorParent->ScheduleRenderOnCompositorThread();
}
}
void AsyncPanZoomController::RequestContentRepaint() {
mPreviousPaintStartTime = GetFrameTime();
double estimatedPaintSum = 0.0;
for (uint32_t i = 0; i < mPreviousPaintDurations.Length(); i++) {
estimatedPaintSum += mPreviousPaintDurations[i].ToSeconds();
}
double estimatedPaintDuration = 0.0;
if (estimatedPaintSum > EPSILON) {
estimatedPaintDuration = estimatedPaintSum / mPreviousPaintDurations.Length();
}
mFrameMetrics.mDisplayPort =
CalculatePendingDisplayPort(mFrameMetrics,
GetVelocityVector(),
GetAccelerationVector(),
estimatedPaintDuration);
// If we're trying to paint what we already think is painted, discard this
// request since it's a pointless paint.
CSSRect oldDisplayPort = mLastPaintRequestMetrics.mDisplayPort
+ mLastPaintRequestMetrics.mScrollOffset;
CSSRect newDisplayPort = mFrameMetrics.mDisplayPort
+ mFrameMetrics.mScrollOffset;
if (fabsf(oldDisplayPort.x - newDisplayPort.x) < EPSILON &&
fabsf(oldDisplayPort.y - newDisplayPort.y) < EPSILON &&
fabsf(oldDisplayPort.width - newDisplayPort.width) < EPSILON &&
fabsf(oldDisplayPort.height - newDisplayPort.height) < EPSILON &&
fabsf(mLastPaintRequestMetrics.mScrollOffset.x -
mFrameMetrics.mScrollOffset.x) < EPSILON &&
fabsf(mLastPaintRequestMetrics.mScrollOffset.y -
mFrameMetrics.mScrollOffset.y) < EPSILON &&
mFrameMetrics.mResolution == mLastPaintRequestMetrics.mResolution) {
return;
}
SendAsyncScrollEvent();
// Cache the zoom since we're temporarily changing it for
// acceleration-scaled painting.
ScreenToScreenScale actualZoom = mFrameMetrics.mZoom;
// Calculate the factor of acceleration based on the faster of the two axes.
float accelerationFactor =
clamped(std::max(mX.GetAccelerationFactor(), mY.GetAccelerationFactor()),
MIN_ZOOM / 2.0f, MAX_ZOOM);
// Scale down the resolution a bit based on acceleration.
mFrameMetrics.mZoom.scale /= accelerationFactor;
// This message is compressed, so fire whether or not we already have a paint
// queued up. We need to know whether or not a paint was requested anyways,
// for the purposes of content calling window.scrollTo().
mPaintThrottler.PostTask(
FROM_HERE,
NewRunnableMethod(mGeckoContentController.get(),
&GeckoContentController::RequestContentRepaint,
mFrameMetrics));
mFrameMetrics.mPresShellId = mLastContentPaintMetrics.mPresShellId;
mLastPaintRequestMetrics = mFrameMetrics;
mWaitingForContentToPaint = true;
// Set the zoom back to what it was for the purpose of logic control.
mFrameMetrics.mZoom = actualZoom;
}
void
AsyncPanZoomController::FireAsyncScrollOnTimeout()
{
if (mCurrentAsyncScrollOffset != mLastAsyncScrollOffset) {
MonitorAutoLock monitor(mMonitor);
SendAsyncScrollEvent();
}
mAsyncScrollTimeoutTask = nullptr;
}
bool AsyncPanZoomController::SampleContentTransformForFrame(const TimeStamp& aSampleTime,
ContainerLayer* aLayer,
ViewTransform* aNewTransform,
ScreenPoint& aScrollOffset) {
// The eventual return value of this function. The compositor needs to know
// whether or not to advance by a frame as soon as it can. For example, if a
// fling is happening, it has to keep compositing so that the animation is
// smooth. If an animation frame is requested, it is the compositor's
// responsibility to schedule a composite.
bool requestAnimationFrame = false;
LayerPoint metricsScrollOffset;
CSSPoint scrollOffset;
CSSToScreenScale localScale;
const FrameMetrics& frame = aLayer->GetFrameMetrics();
{
MonitorAutoLock mon(mMonitor);
switch (mState) {
case FLING:
// If a fling is currently happening, apply it now. We can pull
// the updated metrics afterwards.
requestAnimationFrame |= DoFling(aSampleTime - mLastSampleTime);
break;
case ANIMATING_ZOOM: {
double animPosition = (aSampleTime - mAnimationStartTime) / ZOOM_TO_DURATION;
if (animPosition > 1.0) {
animPosition = 1.0;
}
// Sample the zoom at the current time point. The sampled zoom
// will affect the final computed resolution.
double sampledPosition = gComputedTimingFunction->GetValue(animPosition);
ScreenToScreenScale startZoom = mStartZoomToMetrics.mZoom;
ScreenToScreenScale endZoom = mEndZoomToMetrics.mZoom;
mFrameMetrics.mZoom = ScreenToScreenScale(endZoom.scale * sampledPosition +
startZoom.scale * (1 - sampledPosition));
mFrameMetrics.mScrollOffset = CSSPoint::FromUnknownPoint(gfx::Point(
mEndZoomToMetrics.mScrollOffset.x * sampledPosition +
mStartZoomToMetrics.mScrollOffset.x * (1 - sampledPosition),
mEndZoomToMetrics.mScrollOffset.y * sampledPosition +
mStartZoomToMetrics.mScrollOffset.y * (1 - sampledPosition)
));
requestAnimationFrame = true;
if (aSampleTime - mAnimationStartTime >= ZOOM_TO_DURATION) {
// Bring the resolution in sync with the zoom.
SetZoomAndResolution(mFrameMetrics.mZoom);
mState = NOTHING;
SendAsyncScrollEvent();
RequestContentRepaint();
}
break;
}
default:
break;
}
// Current local transform; this is not what's painted but rather
// what PZC has transformed due to touches like panning or
// pinching. Eventually, the root layer transform will become this
// during runtime, but we must wait for Gecko to repaint.
localScale = mFrameMetrics.CalculateResolution();
if (frame.IsScrollable()) {
metricsScrollOffset = frame.GetScrollOffsetInLayerPixels();
}
scrollOffset = mFrameMetrics.mScrollOffset;
mCurrentAsyncScrollOffset = mFrameMetrics.mScrollOffset;
}
// Cancel the mAsyncScrollTimeoutTask because we will fire a
// mozbrowserasyncscroll event or renew the mAsyncScrollTimeoutTask again.
if (mAsyncScrollTimeoutTask) {
mAsyncScrollTimeoutTask->Cancel();
mAsyncScrollTimeoutTask = nullptr;
}
// Fire the mozbrowserasyncscroll event immediately if it's been
// sAsyncScrollThrottleTime ms since the last time we fired the event and the
// current scroll offset is different than the mLastAsyncScrollOffset we sent
// with the last event.
// Otherwise, start a timer to fire the event sAsyncScrollTimeout ms from now.
TimeDuration delta = aSampleTime - mLastAsyncScrollTime;
if (delta.ToMilliseconds() > mAsyncScrollThrottleTime &&
mCurrentAsyncScrollOffset != mLastAsyncScrollOffset) {
MonitorAutoLock monitor(mMonitor);
mLastAsyncScrollTime = aSampleTime;
mLastAsyncScrollOffset = mCurrentAsyncScrollOffset;
SendAsyncScrollEvent();
}
else {
mAsyncScrollTimeoutTask =
NewRunnableMethod(this, &AsyncPanZoomController::FireAsyncScrollOnTimeout);
MessageLoop::current()->PostDelayedTask(FROM_HERE,
mAsyncScrollTimeoutTask,
mAsyncScrollTimeout);
}
// Scales on the root layer, on what's currently painted.
const gfx3DMatrix& currentTransform = aLayer->GetTransform();
CSSToLayerScale rootScale = frame.mDevPixelsPerCSSPixel
/ LayerToLayoutDeviceScale(currentTransform.GetXScale(), currentTransform.GetYScale());
LayerPoint translation = (scrollOffset * rootScale) - metricsScrollOffset;
*aNewTransform = ViewTransform(-translation, localScale / frame.mDevPixelsPerCSSPixel);
aScrollOffset = scrollOffset * localScale;
mLastSampleTime = aSampleTime;
return requestAnimationFrame;
}
void AsyncPanZoomController::NotifyLayersUpdated(const FrameMetrics& aViewportFrame, bool aIsFirstPaint) {
MonitorAutoLock monitor(mMonitor);
mLastContentPaintMetrics = aViewportFrame;
mFrameMetrics.mMayHaveTouchListeners = aViewportFrame.mMayHaveTouchListeners;
if (mWaitingForContentToPaint) {
// Remove the oldest sample we have if adding a new sample takes us over our
// desired number of samples.
if (mPreviousPaintDurations.Length() >= gNumPaintDurationSamples) {
mPreviousPaintDurations.RemoveElementAt(0);
}
mPreviousPaintDurations.AppendElement(
GetFrameTime() - mPreviousPaintStartTime);
} else {
// No paint was requested, but we got one anyways. One possible cause of this
// is that content could have fired a scrollTo(). In this case, we should take
// the new scroll offset. Document/viewport changes are handled elsewhere.
// Also note that, since NotifyLayersUpdated() is called whenever there's a
// layers update, we didn't necessarily get a new scroll offset, but we're
// updating our local copy of it anyways just in case.
switch (mState) {
case NOTHING:
case FLING:
case TOUCHING:
case WAITING_LISTENERS:
mFrameMetrics.mScrollOffset = aViewportFrame.mScrollOffset;
break;
// Don't clobber if we're in other states.
default:
break;
}
}
mWaitingForContentToPaint = mPaintThrottler.TaskComplete();
bool needContentRepaint = false;
if (aViewportFrame.mCompositionBounds.width == mFrameMetrics.mCompositionBounds.width &&
aViewportFrame.mCompositionBounds.height == mFrameMetrics.mCompositionBounds.height) {
// Remote content has sync'd up to the composition geometry
// change, so we can accept the viewport it's calculated.
CSSToScreenScale previousResolution = mFrameMetrics.CalculateResolution();
mFrameMetrics.mViewport = aViewportFrame.mViewport;
CSSToScreenScale newResolution = mFrameMetrics.CalculateResolution();
needContentRepaint |= (previousResolution != newResolution);
}
if (aIsFirstPaint || mFrameMetrics.IsDefault()) {
mPreviousPaintDurations.Clear();
mX.CancelTouch();
mY.CancelTouch();
mFrameMetrics = aViewportFrame;
mState = NOTHING;
} else if (!mFrameMetrics.mScrollableRect.IsEqualEdges(aViewportFrame.mScrollableRect)) {
mFrameMetrics.mScrollableRect = aViewportFrame.mScrollableRect;
}
if (needContentRepaint) {
RequestContentRepaint();
}
}
const FrameMetrics& AsyncPanZoomController::GetFrameMetrics() {
mMonitor.AssertCurrentThreadOwns();
return mFrameMetrics;
}
void AsyncPanZoomController::UpdateCompositionBounds(const ScreenIntRect& aCompositionBounds) {
MonitorAutoLock mon(mMonitor);
ScreenIntRect oldCompositionBounds = mFrameMetrics.mCompositionBounds;
mFrameMetrics.mCompositionBounds = aCompositionBounds;
// If the window had 0 dimensions before, or does now, we don't want to
// repaint or update the zoom since we'll run into rendering issues and/or
// divide-by-zero. This manifests itself as the screen flashing. If the page
// has gone out of view, the buffer will be cleared elsewhere anyways.
if (aCompositionBounds.width && aCompositionBounds.height &&
oldCompositionBounds.width && oldCompositionBounds.height) {
SetZoomAndResolution(mFrameMetrics.mZoom);
// Repaint on a rotation so that our new resolution gets properly updated.
RequestContentRepaint();
}
}
void AsyncPanZoomController::CancelDefaultPanZoom() {
mDisableNextTouchBatch = true;
if (mGestureEventListener) {
mGestureEventListener->CancelGesture();
}
}
void AsyncPanZoomController::DetectScrollableSubframe() {
mDelayPanning = true;
}
void AsyncPanZoomController::ZoomToRect(const gfxRect& aRect) {
CSSRect zoomToRect(aRect.x, aRect.y, aRect.width, aRect.height);
SetState(ANIMATING_ZOOM);
{
MonitorAutoLock mon(mMonitor);
ScreenIntRect compositionBounds = mFrameMetrics.mCompositionBounds;
CSSRect cssPageRect = mFrameMetrics.mScrollableRect;
CSSPoint scrollOffset = mFrameMetrics.mScrollOffset;
float currentZoom = mFrameMetrics.mZoom.scale;
float targetZoom;
float intrinsicScale = mFrameMetrics.CalculateIntrinsicScale().scale;
// The minimum zoom to prevent over-zoom-out.
// If the zoom factor is lower than this (i.e. we are zoomed more into the page),
// then the CSS content rect, in layers pixels, will be smaller than the
// composition bounds. If this happens, we can't fill the target composited
// area with this frame.
float localMinZoom = std::max(mMinZoom,
std::max(compositionBounds.width / cssPageRect.width,
compositionBounds.height / cssPageRect.height))
/ intrinsicScale;
float localMaxZoom = mMaxZoom / intrinsicScale;
if (!zoomToRect.IsEmpty()) {
// Intersect the zoom-to-rect to the CSS rect to make sure it fits.
zoomToRect = zoomToRect.Intersect(cssPageRect);
float targetResolution =
std::min(compositionBounds.width / zoomToRect.width,
compositionBounds.height / zoomToRect.height);
targetZoom = targetResolution / intrinsicScale;
}
// 1. If the rect is empty, request received from browserElementScrolling.js
// 2. currentZoom is equal to mMaxZoom and user still double-tapping it
// 3. currentZoom is equal to localMinZoom and user still double-tapping it
// Treat these three cases as a request to zoom out as much as possible.
if (zoomToRect.IsEmpty() ||
(currentZoom == localMaxZoom && targetZoom >= localMaxZoom) ||
(currentZoom == localMinZoom && targetZoom <= localMinZoom)) {
CSSRect compositedRect = mFrameMetrics.CalculateCompositedRectInCssPixels();
float y = scrollOffset.y;
float newHeight =
cssPageRect.width * (compositedRect.height / compositedRect.width);
float dh = compositedRect.height - newHeight;
zoomToRect = CSSRect(0.0f,
y + dh/2,
cssPageRect.width,
newHeight);
zoomToRect = zoomToRect.Intersect(cssPageRect);
float targetResolution =
std::min(compositionBounds.width / zoomToRect.width,
compositionBounds.height / zoomToRect.height);
targetZoom = targetResolution / intrinsicScale;
}
targetZoom = clamped(targetZoom, localMinZoom, localMaxZoom);
mEndZoomToMetrics.mZoom = ScreenToScreenScale(targetZoom);
// Adjust the zoomToRect to a sensible position to prevent overscrolling.
FrameMetrics metricsAfterZoom = mFrameMetrics;
metricsAfterZoom.mZoom = mEndZoomToMetrics.mZoom;
CSSRect rectAfterZoom = metricsAfterZoom.CalculateCompositedRectInCssPixels();
// If either of these conditions are met, the page will be
// overscrolled after zoomed
if (zoomToRect.y + rectAfterZoom.height > cssPageRect.height) {
zoomToRect.y = cssPageRect.height - rectAfterZoom.height;
zoomToRect.y = zoomToRect.y > 0 ? zoomToRect.y : 0;
}
if (zoomToRect.x + rectAfterZoom.width > cssPageRect.width) {
zoomToRect.x = cssPageRect.width - rectAfterZoom.width;
zoomToRect.x = zoomToRect.x > 0 ? zoomToRect.x : 0;
}
mStartZoomToMetrics = mFrameMetrics;
mEndZoomToMetrics.mScrollOffset = zoomToRect.TopLeft();
mAnimationStartTime = GetFrameTime();
ScheduleComposite();
}
}
void AsyncPanZoomController::ContentReceivedTouch(bool aPreventDefault) {
if (!mFrameMetrics.mMayHaveTouchListeners && !mDelayPanning) {
mTouchQueue.Clear();
return;
}
if (mTouchListenerTimeoutTask) {
mTouchListenerTimeoutTask->Cancel();
mTouchListenerTimeoutTask = nullptr;
}
if (mState == WAITING_LISTENERS) {
if (!aPreventDefault) {
// Delayed scrolling gesture is pending at TOUCHING state.
if (mDelayPanning) {
SetState(TOUCHING);
} else {
SetState(NOTHING);
}
}
mHandlingTouchQueue = true;
while (!mTouchQueue.IsEmpty()) {
// we need to reset mDelayPanning before handling scrolling gesture.
if (!aPreventDefault && mTouchQueue[0].mType == MultiTouchInput::MULTITOUCH_MOVE) {
mDelayPanning = false;
}
if (!aPreventDefault) {
HandleInputEvent(mTouchQueue[0]);
}
if (mTouchQueue[0].mType == MultiTouchInput::MULTITOUCH_END ||
mTouchQueue[0].mType == MultiTouchInput::MULTITOUCH_CANCEL) {
mTouchQueue.RemoveElementAt(0);
break;
}
mTouchQueue.RemoveElementAt(0);
}
mHandlingTouchQueue = false;
}
}
void AsyncPanZoomController::SetState(PanZoomState aState) {
MonitorAutoLock monitor(mMonitor);
mState = aState;
}
void AsyncPanZoomController::TimeoutTouchListeners() {
mTouchListenerTimeoutTask = nullptr;
ContentReceivedTouch(false);
}
void AsyncPanZoomController::SetZoomAndResolution(const ScreenToScreenScale& aZoom) {
mMonitor.AssertCurrentThreadOwns();
mFrameMetrics.mZoom = aZoom;
CSSToScreenScale resolution = mFrameMetrics.CalculateResolution();
// We use ScreenToLayerScale(1) below in order to ask gecko to render
// what's currently visible on the screen. This is effectively turning
// the async zoom amount into the gecko zoom amount.
mFrameMetrics.mResolution = resolution / mFrameMetrics.mDevPixelsPerCSSPixel * ScreenToLayerScale(1);
}
void AsyncPanZoomController::UpdateZoomConstraints(bool aAllowZoom,
float aMinZoom,
float aMaxZoom) {
mAllowZoom = aAllowZoom;
mMinZoom = std::max(MIN_ZOOM, aMinZoom);
mMaxZoom = std::min(MAX_ZOOM, aMaxZoom);
}
void AsyncPanZoomController::PostDelayedTask(Task* aTask, int aDelayMs) {
if (!mGeckoContentController) {
return;
}
mGeckoContentController->PostDelayedTask(aTask, aDelayMs);
}
void AsyncPanZoomController::SendAsyncScrollEvent() {
if (!mGeckoContentController) {
return;
}
CSSRect contentRect;
CSSSize scrollableSize;
{
scrollableSize = mFrameMetrics.mScrollableRect.Size();
contentRect = mFrameMetrics.CalculateCompositedRectInCssPixels();
contentRect.MoveTo(mCurrentAsyncScrollOffset);
}
mGeckoContentController->SendAsyncScrollDOMEvent(contentRect, scrollableSize);
}
}
}
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