| /* |
| * 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) { |
| float maxAlpha = 0.6f; |
| 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; |
| } |
| } |
| |
| /** |
| * 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(); |
| } |
| } |