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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/macros.h"
#include "third_party/skia/include/core/SkColor.h"
#include "ui/gfx/animation/animation_export.h"
#include "ui/gfx/geometry/rect.h"
#include "ui/gfx/geometry/rect_f.h"
#include "ui/gfx/geometry/size_f.h"
#include "ui/gfx/transform.h"
namespace base {
class TimeTicks;
namespace gfx {
enum Type {
LINEAR, // Linear.
EASE_OUT, // Fast in, slow out (default).
EASE_IN, // Slow in, fast out.
EASE_IN_2, // Variant of EASE_IN that starts out slower than
EASE_IN_OUT, // Slow in and out, fast in the middle.
FAST_IN_OUT, // Fast in and out, slow in the middle.
EASE_OUT_SNAP, // Fast in, slow out, snap to final value.
SMOOTH_IN_OUT, // Smooth, consistent speeds in and out (sine wave).
FAST_OUT_SLOW_IN, // Variant of EASE_IN_OUT which should be used in most
// cases.
FAST_OUT_SLOW_IN_2, // Variant of FAST_OUT_SLOW_IN that starts out quicker.
LINEAR_OUT_SLOW_IN, // Variant of EASE_OUT which should be used for
// fading in from 0% or motion when entering a scene.
SLOW_OUT_LINEAR_IN, // Reverse of LINEAR_OUT_SLOW_IN which should be used
// in reverse animation to create a rubberband effect.
FAST_OUT_LINEAR_IN, // Variant of EASE_IN which should should be used for
// fading out to 0% or motion when exiting a scene.
ZERO, // Returns a value of 0 always.
// Returns the value based on the tween type. |state| is from 0-1.
static double CalculateValue(Type type, double state);
// Conveniences for getting a value between a start and end point.
static SkColor ColorValueBetween(double value, SkColor start, SkColor target);
static double DoubleValueBetween(double value, double start, double target);
static float FloatValueBetween(double value, float start, float target);
static float ClampedFloatValueBetween(const base::TimeTicks& time,
const base::TimeTicks& start_time,
float start,
const base::TimeTicks& target_time,
float target);
// Interpolated between start and target, with every integer in this range
// given equal weight.
static int IntValueBetween(double value, int start, int target);
// Interpolates between start and target as real numbers, and rounds the
// result to the nearest integer, with ties broken by rounding towards
// positive infinity. This gives start and target half the weight of the
// other integers in the range. This is the integer interpolation approach
// specified by
static int LinearIntValueBetween(double value, int start, int target);
// Interpolates between |start| and |target| rects, animating the rect corners
// (as opposed to animating the rect origin and size) to minimize rounding
// error accumulation at intermediate stages.
static gfx::Rect RectValueBetween(double value,
const gfx::Rect& start,
const gfx::Rect& target);
static gfx::RectF RectFValueBetween(double value,
const gfx::RectF& start,
const gfx::RectF& target);
static gfx::Transform TransformValueBetween(double value,
const gfx::Transform& start,
const gfx::Transform& target);
static gfx::SizeF SizeValueBetween(double value,
const gfx::SizeF& start,
const gfx::SizeF& target);
} // namespace gfx