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/* -*- 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/. */
#ifndef mozilla_layers_APZPublicUtils_h
#define mozilla_layers_APZPublicUtils_h
// This file is for APZ-related utilities that need to be consumed from outside
// of gfx/layers. For internal utilities, prefer APZUtils.h.
#include <stdint.h>
#include <utility>
#include "ScrollAnimationBezierPhysics.h"
#include "Units.h"
#include "mozilla/DefineEnum.h"
#include "mozilla/ScrollOrigin.h"
#include "mozilla/gfx/Point.h"
#include "mozilla/ScrollTypes.h"
namespace mozilla {
namespace layers {
struct FrameMetrics;
// clang-format off
MOZ_DEFINE_ENUM_CLASS_WITH_BASE(APZWheelAction, uint8_t, (
Scroll,
PinchZoom
))
// clang-format on
namespace apz {
/**
* Initializes the global state used in AsyncPanZoomController.
* This is normally called when it is first needed in the constructor
* of APZCTreeManager, but can be called manually to force it to be
* initialized earlier.
*/
void InitializeGlobalState();
/**
* See AsyncPanZoomController::CalculatePendingDisplayPort. This
* function simply delegates to that one, so that non-layers code
* never needs to include AsyncPanZoomController.h
*/
const ScreenMargin CalculatePendingDisplayPort(
const FrameMetrics& aFrameMetrics, const ParentLayerPoint& aVelocity);
/**
* Returns a width and height multiplier, each of which is a power of two
* between 1 and 8 inclusive. The multiplier is chosen based on the provided
* base size, such that multiplier is larger when the base size is larger.
* The exact details are somewhat arbitrary and tuned by hand.
* This function is intended to only be used with WebRender, because that is
* the codepath that wants to use a larger displayport alignment, because
* moving the displayport is relatively expensive with WebRender.
*/
gfx::IntSize GetDisplayportAlignmentMultiplier(const ScreenSize& aBaseSize);
/**
* Calculate the physics parameters for smooth scroll animations for the
* given origin, based on pref values.
*/
ScrollAnimationBezierPhysicsSettings ComputeBezierAnimationSettingsForOrigin(
ScrollOrigin aOrigin);
/**
* Calculate if the scrolling should be instant or smooth based based on
* preferences and the origin
*/
ScrollMode GetScrollModeForOrigin(ScrollOrigin origin);
} // namespace apz
} // namespace layers
} // namespace mozilla
#endif // mozilla_layers_APZPublicUtils_h
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