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/*
* 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 android.util;
import android.app.ActivityThread;
import android.content.Context;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.drawable.AdaptiveIconDrawable;
import android.graphics.drawable.Drawable;
import android.graphics.drawable.DrawableWrapper;
import android.graphics.drawable.LayerDrawable;
/**
* Utility class to handle icon treatments (e.g., shadow generation) for the Launcher icons.
* @hide
*/
public final class LauncherIcons {
// Percent of actual icon size
private static final float ICON_SIZE_BLUR_FACTOR = 0.5f/48;
// Percent of actual icon size
private static final float ICON_SIZE_KEY_SHADOW_DELTA_FACTOR = 1f/48;
private static final int KEY_SHADOW_ALPHA = 61;
private static final int AMBIENT_SHADOW_ALPHA = 30;
private final SparseArray<Bitmap> mShadowCache = new SparseArray<>();
private final int mIconSize;
private final Resources mRes;
public LauncherIcons(Context context) {
mRes = context.getResources();
mIconSize = mRes.getDimensionPixelSize(android.R.dimen.app_icon_size);
}
public Drawable wrapIconDrawableWithShadow(Drawable drawable) {
if (!(drawable instanceof AdaptiveIconDrawable)) {
return drawable;
}
Bitmap shadow = getShadowBitmap((AdaptiveIconDrawable) drawable);
return new ShadowDrawable(shadow, drawable);
}
private Bitmap getShadowBitmap(AdaptiveIconDrawable d) {
int shadowSize = Math.max(mIconSize, d.getIntrinsicHeight());
synchronized (mShadowCache) {
Bitmap shadow = mShadowCache.get(shadowSize);
if (shadow != null) {
return shadow;
}
}
d.setBounds(0, 0, shadowSize, shadowSize);
float blur = ICON_SIZE_BLUR_FACTOR * shadowSize;
float keyShadowDistance = ICON_SIZE_KEY_SHADOW_DELTA_FACTOR * shadowSize;
int bitmapSize = (int) (shadowSize + 2 * blur + keyShadowDistance);
Bitmap shadow = Bitmap.createBitmap(bitmapSize, bitmapSize, Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(shadow);
canvas.translate(blur + keyShadowDistance / 2, blur);
Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
paint.setColor(Color.TRANSPARENT);
// Draw ambient shadow
paint.setShadowLayer(blur, 0, 0, AMBIENT_SHADOW_ALPHA << 24);
canvas.drawPath(d.getIconMask(), paint);
// Draw key shadow
canvas.translate(0, keyShadowDistance);
paint.setShadowLayer(blur, 0, 0, KEY_SHADOW_ALPHA << 24);
canvas.drawPath(d.getIconMask(), paint);
canvas.setBitmap(null);
synchronized (mShadowCache) {
mShadowCache.put(shadowSize, shadow);
}
return shadow;
}
public Drawable getBadgeDrawable(int foregroundRes, int backgroundColor) {
return getBadgedDrawable(null, foregroundRes, backgroundColor);
}
public Drawable getBadgedDrawable(Drawable base, int foregroundRes, int backgroundColor) {
Resources overlayableRes =
ActivityThread.currentActivityThread().getApplication().getResources();
Drawable badgeShadow = overlayableRes.getDrawable(
com.android.internal.R.drawable.ic_corp_icon_badge_shadow);
Drawable badgeColor = overlayableRes.getDrawable(
com.android.internal.R.drawable.ic_corp_icon_badge_color)
.getConstantState().newDrawable().mutate();
Drawable badgeForeground = overlayableRes.getDrawable(foregroundRes);
badgeForeground.setTint(backgroundColor);
Drawable[] drawables = base == null
? new Drawable[] {badgeShadow, badgeColor, badgeForeground }
: new Drawable[] {base, badgeShadow, badgeColor, badgeForeground };
return new LayerDrawable(drawables);
}
/**
* A drawable which draws a shadow bitmap behind a drawable
*/
private static class ShadowDrawable extends DrawableWrapper {
final MyConstantState mState;
public ShadowDrawable(Bitmap shadow, Drawable dr) {
super(dr);
mState = new MyConstantState(shadow, dr.getConstantState());
}
ShadowDrawable(MyConstantState state) {
super(state.mChildState.newDrawable());
mState = state;
}
@Override
public ConstantState getConstantState() {
return mState;
}
@Override
public void draw(Canvas canvas) {
Rect bounds = getBounds();
canvas.drawBitmap(mState.mShadow, null, bounds, mState.mPaint);
canvas.save();
// Ratio of child drawable size to shadow bitmap size
float factor = 1 / (1 + 2 * ICON_SIZE_BLUR_FACTOR + ICON_SIZE_KEY_SHADOW_DELTA_FACTOR);
canvas.translate(
bounds.width() * factor *
(ICON_SIZE_BLUR_FACTOR + ICON_SIZE_KEY_SHADOW_DELTA_FACTOR / 2),
bounds.height() * factor * ICON_SIZE_BLUR_FACTOR);
canvas.scale(factor, factor);
super.draw(canvas);
canvas.restore();
}
private static class MyConstantState extends ConstantState {
final Paint mPaint = new Paint(Paint.FILTER_BITMAP_FLAG);
final Bitmap mShadow;
final ConstantState mChildState;
MyConstantState(Bitmap shadow, ConstantState childState) {
mShadow = shadow;
mChildState = childState;
}
@Override
public Drawable newDrawable() {
return new ShadowDrawable(this);
}
@Override
public int getChangingConfigurations() {
return mChildState.getChangingConfigurations();
}
}
}
}
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