1
2/*
3 * Copyright 2006 The Android Open Source Project
4 *
5 * Use of this source code is governed by a BSD-style license that can be
6 * found in the LICENSE file.
7 */
8
9
10#ifndef SkOperandInterpolator_DEFINED
11#define SkOperandInterpolator_DEFINED
12
13#include "SkDisplayType.h"
14#include "SkInterpolator.h"
15#include "SkOperand.h"
16
17class SkOperandInterpolator : public SkInterpolatorBase {
18public:
19    SkOperandInterpolator();
20    SkOperandInterpolator(int elemCount, int frameCount, SkDisplayTypes type);
21    SkOperand* getValues() { return fValues; }
22    int getValuesCount() { return fFrameCount * fElemCount; }
23    void    reset(int elemCount, int frameCount, SkDisplayTypes type);
24
25    /** Add or replace a key frame, copying the values[] data into the interpolator.
26        @param index    The index of this frame (frames must be ordered by time)
27        @param time The millisecond time for this frame
28        @param values   The array of values [elemCount] for this frame. The data is copied
29                        into the interpolator.
30        @param blend    A positive scalar specifying how to blend between this and the next key frame.
31                        [0...1) is a cubic lag/log/lag blend (slow to change at the beginning and end)
32                        1 is a linear blend (default)
33                        (1...inf) is a cubic log/lag/log blend (fast to change at the beginning and end)
34    */
35    bool    setKeyFrame(int index, SkMSec time, const SkOperand values[], SkScalar blend = SK_Scalar1);
36    Result timeToValues(SkMSec time, SkOperand values[]) const;
37    SkDEBUGCODE(static void UnitTest();)
38private:
39    SkDisplayTypes fType;
40    SkOperand* fValues;     // pointer into fStorage
41#ifdef SK_DEBUG
42    SkOperand(* fValuesArray)[10];
43#endif
44    typedef SkInterpolatorBase INHERITED;
45};
46
47#endif // SkOperandInterpolator_DEFINED
48