chromium/cc/input/page_scale_animation.h

// Copyright 2011 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CC_INPUT_PAGE_SCALE_ANIMATION_H_
#define CC_INPUT_PAGE_SCALE_ANIMATION_H_

#include <memory>

#include "base/time/time.h"
#include "cc/cc_export.h"
#include "ui/gfx/geometry/cubic_bezier.h"
#include "ui/gfx/geometry/point.h"
#include "ui/gfx/geometry/point_f.h"
#include "ui/gfx/geometry/size_f.h"
#include "ui/gfx/geometry/vector2d_f.h"

namespace cc {

// Used in the CC to pass around a scale animation that hasn't yet been
// initialized.
struct PendingPageScaleAnimation { … };

// A small helper class that does the math for zoom animations, primarily for
// double-tap zoom. Initialize it with starting and ending scroll/page scale
// positions and an animation length time, then call ...AtTime() at every frame
// to obtain the current interpolated position. The supplied timing function
// is used to ease the animation.
//
// All sizes and vectors in this class's public methods are in the root scroll
// layer's coordinate space.
class CC_EXPORT PageScaleAnimation { … };

}  // namespace cc

#endif  // CC_INPUT_PAGE_SCALE_ANIMATION_H_