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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.launcher3.graphics;
import static com.android.launcher3.ItemInfoWithIcon.FLAG_ADAPTIVE_ICON;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BlurMaskFilter;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.PorterDuff;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.util.SparseArray;
import com.android.launcher3.BubbleTextView;
import com.android.launcher3.ItemInfoWithIcon;
import com.android.launcher3.R;
/**
* Utility class to generate shadow and outline effect, which are used for click feedback
* and drag-n-drop respectively.
*/
public class HolographicOutlineHelper {
/**
* Bitmap used as shadow for Adaptive icons
*/
public static final Bitmap ADAPTIVE_ICON_SHADOW_BITMAP =
Bitmap.createBitmap(1, 1, Bitmap.Config.ALPHA_8);
private static HolographicOutlineHelper sInstance;
private final Canvas mCanvas = new Canvas();
private final Paint mBlurPaint = new Paint(Paint.ANTI_ALIAS_FLAG | Paint.FILTER_BITMAP_FLAG);
private final Paint mErasePaint = new Paint(Paint.ANTI_ALIAS_FLAG | Paint.FILTER_BITMAP_FLAG);
private final float mShadowBitmapShift;
private final BlurMaskFilter mShadowBlurMaskFilter;
// We have 4 different icon sizes: homescreen, hotseat, folder & all-apps
private final SparseArray<Bitmap> mBitmapCache = new SparseArray<>(4);
private HolographicOutlineHelper(Context context) {
mShadowBitmapShift = context.getResources().getDimension(R.dimen.blur_size_click_shadow);
mShadowBlurMaskFilter = new BlurMaskFilter(mShadowBitmapShift, BlurMaskFilter.Blur.NORMAL);
mErasePaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT));
}
public static HolographicOutlineHelper getInstance(Context context) {
if (sInstance == null) {
sInstance = new HolographicOutlineHelper(context.getApplicationContext());
}
return sInstance;
}
public Bitmap createMediumDropShadow(BubbleTextView view) {
if (view.getTag() instanceof ItemInfoWithIcon &&
((((ItemInfoWithIcon) view.getTag()).runtimeStatusFlags & FLAG_ADAPTIVE_ICON)
!= 0)) {
return ADAPTIVE_ICON_SHADOW_BITMAP;
}
Drawable drawable = view.getIcon();
if (drawable == null) {
return null;
}
float scaleX = view.getScaleX();
float scaleY = view.getScaleY();
Rect rect = drawable.getBounds();
int bitmapWidth = (int) (rect.width() * scaleX);
int bitmapHeight = (int) (rect.height() * scaleY);
if (bitmapHeight <= 0 || bitmapWidth <= 0) {
return null;
}
int key = (bitmapWidth << 16) | bitmapHeight;
Bitmap cache = mBitmapCache.get(key);
if (cache == null) {
cache = Bitmap.createBitmap(bitmapWidth, bitmapHeight, Bitmap.Config.ALPHA_8);
mCanvas.setBitmap(cache);
mBitmapCache.put(key, cache);
} else {
mCanvas.setBitmap(cache);
mCanvas.drawColor(Color.BLACK, PorterDuff.Mode.CLEAR);
}
int saveCount = mCanvas.save();
mCanvas.scale(scaleX, scaleY);
mCanvas.translate(-rect.left, -rect.top);
drawable.draw(mCanvas);
mCanvas.restoreToCount(saveCount);
mCanvas.setBitmap(null);
mBlurPaint.setMaskFilter(mShadowBlurMaskFilter);
int extraSize = (int) (2 * mShadowBitmapShift);
int resultWidth = bitmapWidth + extraSize;
int resultHeight = bitmapHeight + extraSize;
key = (resultWidth << 16) | resultHeight;
Bitmap result = mBitmapCache.get(key);
if (result == null) {
result = Bitmap.createBitmap(resultWidth, resultHeight, Bitmap.Config.ALPHA_8);
mCanvas.setBitmap(result);
} else {
// Use put instead of delete, to avoid unnecessary shrinking of cache array
mBitmapCache.put(key, null);
mCanvas.setBitmap(result);
mCanvas.drawColor(Color.BLACK, PorterDuff.Mode.CLEAR);
}
mCanvas.drawBitmap(cache, mShadowBitmapShift, mShadowBitmapShift, mBlurPaint);
mCanvas.setBitmap(null);
return result;
}
public void recycleShadowBitmap(Bitmap bitmap) {
if (bitmap != null && bitmap != ADAPTIVE_ICON_SHADOW_BITMAP) {
mBitmapCache.put((bitmap.getWidth() << 16) | bitmap.getHeight(), bitmap);
}
}
}
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