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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set sw=2 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/. */
#ifndef mozilla_layers_APZUtils_h
#define mozilla_layers_APZUtils_h
#include <stdint.h> // for uint32_t
#include "LayersTypes.h"
#include "UnitTransforms.h"
#include "mozilla/gfx/Point.h"
#include "mozilla/FloatingPoint.h"
namespace mozilla {
namespace layers {
enum HitTestResult {
HitNothing,
HitLayer,
HitLayerTouchActionNone,
HitLayerTouchActionPanX,
HitLayerTouchActionPanY,
HitLayerTouchActionPanXY,
HitDispatchToContentRegion,
};
enum CancelAnimationFlags : uint32_t {
Default = 0x0, /* Cancel all animations */
ExcludeOverscroll = 0x1, /* Don't clear overscroll */
ScrollSnap = 0x2 /* Snap to snap points */
};
inline CancelAnimationFlags
operator|(CancelAnimationFlags a, CancelAnimationFlags b)
{
return static_cast<CancelAnimationFlags>(static_cast<int>(a)
| static_cast<int>(b));
}
enum class ScrollSource {
// scrollTo() or something similar.
DOM,
// Touch-screen or trackpad with gesture support.
Touch,
// Mouse wheel.
Wheel
};
typedef uint32_t TouchBehaviorFlags;
// Epsilon to be used when comparing 'float' coordinate values
// with FuzzyEqualsAdditive. The rationale is that 'float' has 7 decimal
// digits of precision, and coordinate values should be no larger than in the
// ten thousands. Note also that the smallest legitimate difference in page
// coordinates is 1 app unit, which is 1/60 of a (CSS pixel), so this epsilon
// isn't too large.
const float COORDINATE_EPSILON = 0.01f;
template <typename Units>
static bool IsZero(const gfx::PointTyped<Units>& aPoint)
{
return FuzzyEqualsAdditive(aPoint.x, 0.0f, COORDINATE_EPSILON)
&& FuzzyEqualsAdditive(aPoint.y, 0.0f, COORDINATE_EPSILON);
}
// Deem an AsyncTransformComponentMatrix (obtained by multiplying together
// one or more AsyncTransformComponentMatrix objects) as constituting a
// complete async transform.
inline AsyncTransformMatrix
CompleteAsyncTransform(const AsyncTransformComponentMatrix& aMatrix)
{
return ViewAs<AsyncTransformMatrix>(aMatrix,
PixelCastJustification::MultipleAsyncTransforms);
}
} // namespace layers
} // namespace mozilla
#endif // mozilla_layers_APZUtils_h
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