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 
17 class SkOperandInterpolator : public SkInterpolatorBase {
18 public:
19     SkOperandInterpolator();
20     SkOperandInterpolator(int elemCount, int frameCount, SkDisplayTypes type);
getValues()21     SkOperand* getValues() { return fValues; }
getValuesCount()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();)
38 private:
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