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/*
* Copyright (C) 2013 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.photos;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.BitmapRegionDecoder;
import android.graphics.Rect;
import android.util.Log;
import com.android.photos.views.TiledImageRenderer;
import java.io.IOException;
public class BitmapRegionTileSource implements TiledImageRenderer.TileSource {
BitmapRegionDecoder mDecoder;
public BitmapRegionTileSource(String path) {
try {
mDecoder = BitmapRegionDecoder.newInstance(path, true);
} catch (IOException e) {
Log.w("BitmapRegionTileSource", "ctor failed", e);
}
}
@Override
public int getTileSize() {
return 256;
}
@Override
public int getImageWidth() {
return mDecoder.getWidth();
}
@Override
public int getImageHeight() {
return mDecoder.getHeight();
}
@Override
public Bitmap getTile(int level, int x, int y, Bitmap bitmap) {
int tileSize = getTileSize();
int t = tileSize << level;
Rect wantRegion = new Rect(x, y, x + t, y + t);
if (bitmap == null) {
bitmap = Bitmap.createBitmap(tileSize, tileSize, Bitmap.Config.ARGB_8888);
}
BitmapFactory.Options options = new BitmapFactory.Options();
options.inPreferredConfig = Bitmap.Config.ARGB_8888;
options.inPreferQualityOverSpeed = true;
options.inSampleSize = (1 << level);
options.inBitmap = bitmap;
try {
// In CropImage, we may call the decodeRegion() concurrently.
bitmap = mDecoder.decodeRegion(wantRegion, options);
} finally {
if (options.inBitmap != bitmap && options.inBitmap != null) {
options.inBitmap = null;
}
}
if (bitmap == null) {
Log.w("BitmapRegionTileSource", "fail in decoding region");
}
return bitmap;
}
}
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