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/*
* 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.Matrix;
import android.graphics.Paint;
import android.graphics.PointF;
import android.graphics.PorterDuff;
import android.graphics.PorterDuffXfermode;
public class HolographicOutlineHelper {
private float mDensity;
private final Paint mHolographicPaint = new Paint();
private final Paint mBlurPaint = new Paint();
private final Paint mErasePaint = new Paint();
private static final Matrix mIdentity = new Matrix();;
private static final float BLUR_FACTOR = 3.5f;
public static final float DEFAULT_STROKE_WIDTH = 6.0f;
public static final int HOLOGRAPHIC_BLUE = 0xFF6699FF;
public static final int HOLOGRAPHIC_GREEN = 0xFF51E633;
HolographicOutlineHelper(float density) {
mDensity = density;
mHolographicPaint.setColor(HOLOGRAPHIC_BLUE);
mHolographicPaint.setFilterBitmap(true);
mHolographicPaint.setAntiAlias(true);
mBlurPaint.setMaskFilter(new BlurMaskFilter(BLUR_FACTOR * density,
BlurMaskFilter.Blur.OUTER));
mBlurPaint.setFilterBitmap(true);
mErasePaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT));
mErasePaint.setFilterBitmap(true);
mErasePaint.setAntiAlias(true);
}
private float cubic(float r) {
return (float) (Math.pow(r - 1, 3) + 1);
}
/**
* Returns the interpolated holographic highlight alpha for the effect we want when scrolling
* pages.
*/
public float highlightAlphaInterpolator(float r) {
final float pivot = 0.3f;
if (r < pivot) {
return Math.max(0.5f, 0.65f * cubic(r / pivot));
} else {
return Math.min(1.0f, 0.65f * cubic(1 - (r - pivot) / (1 - pivot)));
}
}
/**
* Returns the interpolated view alpha for the effect we want when scrolling pages.
*/
public float viewAlphaInterpolator(float r) {
final float pivot = 0.6f;
if (r < pivot) {
return r / pivot;
} else {
return 1.0f;
}
}
/**
* Sets the color of the holographic paint to be used when applying the outline/blur.
*/
void setColor(int color) {
mHolographicPaint.setColor(color);
}
/**
* Applies an outline to whatever is currently drawn in the specified bitmap.
*/
void applyOutline(Bitmap srcDst, Canvas srcDstCanvas, float strokeWidth, PointF offset) {
strokeWidth *= mDensity;
Bitmap mask = srcDst.extractAlpha();
Matrix m = new Matrix();
final int width = srcDst.getWidth();
final int height = srcDst.getHeight();
float xScale = strokeWidth * 2.0f / width;
float yScale = strokeWidth * 2.0f / height;
m.preScale(1 + xScale, 1 + yScale, (width / 2.0f) + offset.x,
(height / 2.0f) + offset.y);
srcDstCanvas.drawColor(0, PorterDuff.Mode.CLEAR);
srcDstCanvas.drawBitmap(mask, m, mHolographicPaint);
srcDstCanvas.drawBitmap(mask, mIdentity, mErasePaint);
mask.recycle();
}
/**
* Applies an blur to whatever is currently drawn in the specified bitmap.
*/
void applyBlur(Bitmap srcDst, Canvas srcDstCanvas) {
int[] xy = new int[2];
Bitmap mask = srcDst.extractAlpha(mBlurPaint, xy);
srcDstCanvas.drawBitmap(mask, xy[0], xy[1], mHolographicPaint);
mask.recycle();
}
}
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