1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
|
/*
* Copyright (C) 2008 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.launcher2;
import android.graphics.Bitmap;
import android.graphics.BlurMaskFilter;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.PorterDuff;
import android.graphics.PorterDuffXfermode;
public class HolographicOutlineHelper {
private final Paint mHolographicPaint = new Paint();
private final Paint mExpensiveBlurPaint = new Paint();
private final Paint mErasePaint = new Paint();
private static final BlurMaskFilter mThickOuterBlurMaskFilter = new BlurMaskFilter(6.0f,
BlurMaskFilter.Blur.OUTER);
private static final BlurMaskFilter mThinOuterBlurMaskFilter = new BlurMaskFilter(1.0f,
BlurMaskFilter.Blur.OUTER);
private static final BlurMaskFilter mThickInnerBlurMaskFilter = new BlurMaskFilter(4.0f,
BlurMaskFilter.Blur.NORMAL);
public static float DEFAULT_STROKE_WIDTH = 6.0f;
HolographicOutlineHelper() {
mHolographicPaint.setFilterBitmap(true);
mHolographicPaint.setAntiAlias(true);
mExpensiveBlurPaint.setFilterBitmap(true);
mErasePaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT));
mErasePaint.setFilterBitmap(true);
mErasePaint.setAntiAlias(true);
}
/**
* Returns the interpolated holographic highlight alpha for the effect we want when scrolling
* pages.
*/
public float highlightAlphaInterpolator(float r) {
float maxAlpha = 0.8f;
return (float) Math.pow(maxAlpha * (1.0f - r), 1.5f);
}
/**
* Returns the interpolated view alpha for the effect we want when scrolling pages.
*/
public float viewAlphaInterpolator(float r) {
final float pivot = 0.95f;
if (r < pivot) {
return (float) Math.pow(r / pivot, 1.5f);
} else {
return 1.0f;
}
}
/**
* Applies a more expensive and accurate outline to whatever is currently drawn in a specified
* bitmap.
*/
void applyExpensiveOutlineWithBlur(Bitmap srcDst, Canvas srcDstCanvas, int color,
int outlineColor) {
// calculate the outer blur first
mExpensiveBlurPaint.setMaskFilter(mThickOuterBlurMaskFilter);
int[] outerBlurOffset = new int[2];
Bitmap thickOuterBlur = srcDst.extractAlpha(mExpensiveBlurPaint, outerBlurOffset);
mExpensiveBlurPaint.setMaskFilter(mThinOuterBlurMaskFilter);
int[] thinOuterBlurOffset = new int[2];
Bitmap thinOuterBlur = srcDst.extractAlpha(mExpensiveBlurPaint, thinOuterBlurOffset);
// calculate the inner blur
srcDstCanvas.drawColor(0xFF000000, PorterDuff.Mode.SRC_OUT);
mExpensiveBlurPaint.setMaskFilter(mThickInnerBlurMaskFilter);
int[] thickInnerBlurOffset = new int[2];
Bitmap thickInnerBlur = srcDst.extractAlpha(mExpensiveBlurPaint, thickInnerBlurOffset);
// mask out the inner blur
srcDstCanvas.setBitmap(thickInnerBlur);
srcDstCanvas.drawBitmap(srcDst, -thickInnerBlurOffset[0],
-thickInnerBlurOffset[1], mErasePaint);
srcDstCanvas.drawRect(0, 0, -thickInnerBlurOffset[0], thickInnerBlur.getHeight(),
mErasePaint);
srcDstCanvas.drawRect(0, 0, thickInnerBlur.getWidth(), -thickInnerBlurOffset[1],
mErasePaint);
// draw the inner and outer blur
srcDstCanvas.setBitmap(srcDst);
srcDstCanvas.drawColor(0x00000000, PorterDuff.Mode.CLEAR);
mHolographicPaint.setColor(color);
srcDstCanvas.drawBitmap(thickInnerBlur, thickInnerBlurOffset[0], thickInnerBlurOffset[1],
mHolographicPaint);
srcDstCanvas.drawBitmap(thickOuterBlur, outerBlurOffset[0], outerBlurOffset[1],
mHolographicPaint);
// draw the bright outline
mHolographicPaint.setColor(outlineColor);
srcDstCanvas.drawBitmap(thinOuterBlur, thinOuterBlurOffset[0], thinOuterBlurOffset[1],
mHolographicPaint);
// cleanup
thinOuterBlur.recycle();
thickOuterBlur.recycle();
thickInnerBlur.recycle();
}
}
|
