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/*
* Copyright (C) 2020 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.systemui.screenshot;
import android.annotation.AnyThread;
import android.graphics.Bitmap;
import android.graphics.HardwareRenderer;
import android.graphics.RecordingCanvas;
import android.graphics.Rect;
import android.graphics.Region;
import android.graphics.RenderNode;
import android.graphics.drawable.Drawable;
import android.os.Handler;
import androidx.annotation.UiThread;
import com.android.internal.util.CallbackRegistry;
import com.android.internal.util.CallbackRegistry.NotifierCallback;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import javax.inject.Inject;
/**
* Owns a series of partial screen captures (tiles).
* <p>
* To display on-screen, use {@link #getDrawable()}.
*/
@UiThread
class ImageTileSet {
private static final String TAG = "ImageTileSet";
private CallbackRegistry<OnContentChangedListener, ImageTileSet, Rect> mContentListeners;
@Inject
ImageTileSet(@UiThread Handler handler) {
mHandler = handler;
}
interface OnContentChangedListener {
/**
* Mark as dirty and rebuild display list.
*/
void onContentChanged();
}
private final List<ImageTile> mTiles = new ArrayList<>();
private final Region mRegion = new Region();
private final Handler mHandler;
void addOnContentChangedListener(OnContentChangedListener listener) {
if (mContentListeners == null) {
mContentListeners = new CallbackRegistry<>(
new NotifierCallback<OnContentChangedListener, ImageTileSet, Rect>() {
@Override
public void onNotifyCallback(OnContentChangedListener callback,
ImageTileSet sender,
int arg, Rect newBounds) {
callback.onContentChanged();
}
});
}
mContentListeners.add(listener);
}
@AnyThread
void addTile(ImageTile tile) {
if (!mHandler.getLooper().isCurrentThread()) {
mHandler.post(() -> addTile(tile));
return;
}
mTiles.add(tile);
mRegion.op(tile.getLocation(), mRegion, Region.Op.UNION);
notifyContentChanged();
}
private void notifyContentChanged() {
if (mContentListeners != null) {
mContentListeners.notifyCallbacks(this, 0, null);
}
}
/**
* Returns a drawable to paint the combined contents of the tiles. Drawable dimensions are
* zero-based and map directly to {@link #getLeft()}, {@link #getTop()}, {@link #getRight()},
* and {@link #getBottom()} which are dimensions relative to the capture start position
* (positive or negative).
*
* @return a drawable to display the image content
*/
Drawable getDrawable() {
return new TiledImageDrawable(this);
}
boolean isEmpty() {
return mTiles.isEmpty();
}
int size() {
return mTiles.size();
}
/**
* @return the bounding rect around any gaps in the tiles.
*/
Rect getGaps() {
Region difference = new Region();
difference.op(mRegion.getBounds(), mRegion, Region.Op.DIFFERENCE);
return difference.getBounds();
}
ImageTile get(int i) {
return mTiles.get(i);
}
Bitmap toBitmap() {
return toBitmap(new Rect(0, 0, getWidth(), getHeight()));
}
/**
* @param bounds Selected portion of the tile set's bounds (equivalent to tile bounds coord
* space). For example, to get the whole doc, use Rect(0, 0, getWidth(),
* getHeight()).
*/
Bitmap toBitmap(Rect bounds) {
if (mTiles.isEmpty()) {
return null;
}
final RenderNode output = new RenderNode("Bitmap Export");
output.setPosition(0, 0, bounds.width(), bounds.height());
RecordingCanvas canvas = output.beginRecording();
Drawable drawable = getDrawable();
drawable.setBounds(bounds);
drawable.draw(canvas);
output.endRecording();
return HardwareRenderer.createHardwareBitmap(output, bounds.width(), bounds.height());
}
int getLeft() {
return mRegion.getBounds().left;
}
int getTop() {
return mRegion.getBounds().top;
}
int getRight() {
return mRegion.getBounds().right;
}
int getBottom() {
return mRegion.getBounds().bottom;
}
int getWidth() {
return mRegion.getBounds().width();
}
int getHeight() {
return mRegion.getBounds().height();
}
void clear() {
if (mTiles.isEmpty()) {
return;
}
mRegion.setEmpty();
Iterator<ImageTile> i = mTiles.iterator();
while (i.hasNext()) {
ImageTile next = i.next();
next.close();
i.remove();
}
notifyContentChanged();
}
}
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