| /* |
| * Copyright (C) 2017 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.launcher3.graphics; |
| |
| import android.annotation.TargetApi; |
| import android.content.res.Resources; |
| import android.content.res.TypedArray; |
| import android.graphics.Bitmap; |
| import android.graphics.BlurMaskFilter; |
| import android.graphics.Canvas; |
| import android.graphics.Color; |
| import android.graphics.ColorFilter; |
| import android.graphics.Paint; |
| import android.graphics.PixelFormat; |
| import android.graphics.Rect; |
| import android.graphics.drawable.Drawable; |
| import android.os.Build; |
| import android.util.AttributeSet; |
| |
| import com.android.launcher3.R; |
| import com.android.launcher3.icons.BitmapRenderer; |
| |
| import org.xmlpull.v1.XmlPullParser; |
| import org.xmlpull.v1.XmlPullParserException; |
| |
| import java.io.IOException; |
| |
| /** |
| * A drawable which adds shadow around a child drawable. |
| */ |
| @TargetApi(Build.VERSION_CODES.O) |
| public class ShadowDrawable extends Drawable { |
| |
| private final Paint mPaint = new Paint(Paint.ANTI_ALIAS_FLAG | Paint.FILTER_BITMAP_FLAG); |
| |
| private final ShadowDrawableState mState; |
| |
| @SuppressWarnings("unused") |
| public ShadowDrawable() { |
| this(new ShadowDrawableState()); |
| } |
| |
| private ShadowDrawable(ShadowDrawableState state) { |
| mState = state; |
| } |
| |
| @Override |
| public void draw(Canvas canvas) { |
| Rect bounds = getBounds(); |
| if (bounds.isEmpty()) { |
| return; |
| } |
| if (mState.mLastDrawnBitmap == null) { |
| regenerateBitmapCache(); |
| } |
| canvas.drawBitmap(mState.mLastDrawnBitmap, null, bounds, mPaint); |
| } |
| |
| @Override |
| public void setAlpha(int alpha) { |
| mPaint.setAlpha(alpha); |
| invalidateSelf(); |
| } |
| |
| @Override |
| public void setColorFilter(ColorFilter colorFilter) { |
| mPaint.setColorFilter(colorFilter); |
| invalidateSelf(); |
| } |
| |
| @Override |
| public ConstantState getConstantState() { |
| return mState; |
| } |
| |
| @Override |
| public int getOpacity() { |
| return PixelFormat.TRANSLUCENT; |
| } |
| |
| @Override |
| public int getIntrinsicHeight() { |
| return mState.mIntrinsicHeight; |
| } |
| |
| @Override |
| public int getIntrinsicWidth() { |
| return mState.mIntrinsicWidth; |
| } |
| |
| @Override |
| public boolean canApplyTheme() { |
| return mState.canApplyTheme(); |
| } |
| |
| @Override |
| public void applyTheme(Resources.Theme t) { |
| TypedArray ta = t.obtainStyledAttributes(new int[] {R.attr.isWorkspaceDarkText}); |
| boolean isDark = ta.getBoolean(0, false); |
| ta.recycle(); |
| if (mState.mIsDark != isDark) { |
| mState.mIsDark = isDark; |
| mState.mLastDrawnBitmap = null; |
| invalidateSelf(); |
| } |
| } |
| |
| private void regenerateBitmapCache() { |
| // Call mutate, so that the pixel allocation by the underlying vector drawable is cleared. |
| Drawable d = mState.mChildState.newDrawable().mutate(); |
| d.setBounds(mState.mShadowSize, mState.mShadowSize, |
| mState.mIntrinsicWidth - mState.mShadowSize, |
| mState.mIntrinsicHeight - mState.mShadowSize); |
| d.setTint(mState.mIsDark ? mState.mDarkTintColor : Color.WHITE); |
| |
| if (mState.mIsDark) { |
| // Dark text do not have any shadow, but just the bitmap |
| mState.mLastDrawnBitmap = BitmapRenderer.createHardwareBitmap( |
| mState.mIntrinsicWidth, mState.mIntrinsicHeight, d::draw); |
| } else { |
| Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG | Paint.FILTER_BITMAP_FLAG); |
| paint.setMaskFilter(new BlurMaskFilter(mState.mShadowSize, BlurMaskFilter.Blur.NORMAL)); |
| |
| // Generate the shadow bitmap |
| int[] offset = new int[2]; |
| Bitmap shadow = BitmapRenderer.createSoftwareBitmap( |
| mState.mIntrinsicWidth, mState.mIntrinsicHeight, d::draw) |
| .extractAlpha(paint, offset); |
| |
| paint.setMaskFilter(null); |
| paint.setColor(mState.mShadowColor); |
| mState.mLastDrawnBitmap = BitmapRenderer.createHardwareBitmap( |
| mState.mIntrinsicWidth, mState.mIntrinsicHeight, c -> { |
| c.drawBitmap(shadow, offset[0], offset[1], paint); |
| d.draw(c); |
| }); |
| } |
| } |
| |
| @Override |
| public void inflate(Resources r, XmlPullParser parser, AttributeSet attrs, |
| Resources.Theme theme) throws XmlPullParserException, IOException { |
| super.inflate(r, parser, attrs, theme); |
| |
| final TypedArray a = theme == null |
| ? r.obtainAttributes(attrs, R.styleable.ShadowDrawable) |
| : theme.obtainStyledAttributes(attrs, R.styleable.ShadowDrawable, 0, 0); |
| try { |
| Drawable d = a.getDrawable(R.styleable.ShadowDrawable_android_src); |
| if (d == null) { |
| throw new XmlPullParserException("missing src attribute"); |
| } |
| mState.mShadowColor = a.getColor( |
| R.styleable.ShadowDrawable_android_shadowColor, Color.BLACK); |
| mState.mShadowSize = a.getDimensionPixelSize( |
| R.styleable.ShadowDrawable_android_elevation, 0); |
| mState.mDarkTintColor = a.getColor( |
| R.styleable.ShadowDrawable_darkTintColor, Color.BLACK); |
| |
| mState.mIntrinsicHeight = d.getIntrinsicHeight() + 2 * mState.mShadowSize; |
| mState.mIntrinsicWidth = d.getIntrinsicWidth() + 2 * mState.mShadowSize; |
| mState.mChangingConfigurations = d.getChangingConfigurations(); |
| |
| mState.mChildState = d.getConstantState(); |
| } finally { |
| a.recycle(); |
| } |
| } |
| |
| private static class ShadowDrawableState extends ConstantState { |
| |
| int mChangingConfigurations; |
| int mIntrinsicWidth; |
| int mIntrinsicHeight; |
| |
| int mShadowColor; |
| int mShadowSize; |
| int mDarkTintColor; |
| |
| boolean mIsDark; |
| Bitmap mLastDrawnBitmap; |
| ConstantState mChildState; |
| |
| @Override |
| public Drawable newDrawable() { |
| return new ShadowDrawable(this); |
| } |
| |
| @Override |
| public int getChangingConfigurations() { |
| return mChangingConfigurations; |
| } |
| |
| @Override |
| public boolean canApplyTheme() { |
| return true; |
| } |
| } |
| } |