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/*
* Copyright (C) 2010 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.gallery3d.ui;
import android.annotation.TargetApi;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.BitmapFactory;
import android.graphics.BitmapRegionDecoder;
import android.graphics.Canvas;
import android.graphics.Rect;
import com.android.gallery3d.common.ApiHelper;
import com.android.gallery3d.common.Utils;
import com.android.gallery3d.data.BitmapPool;
public class TileImageViewAdapter implements TileImageView.Model {
private static final String TAG = "TileImageViewAdapter";
protected ScreenNail mScreenNail;
protected boolean mOwnScreenNail;
protected BitmapRegionDecoder mRegionDecoder;
protected int mImageWidth;
protected int mImageHeight;
protected int mLevelCount;
public TileImageViewAdapter() {
}
public synchronized void clear() {
mScreenNail = null;
mImageWidth = 0;
mImageHeight = 0;
mLevelCount = 0;
mRegionDecoder = null;
}
// Caller is responsible to recycle the ScreenNail
public synchronized void setScreenNail(
ScreenNail screenNail, int width, int height) {
Utils.checkNotNull(screenNail);
mScreenNail = screenNail;
mImageWidth = width;
mImageHeight = height;
mRegionDecoder = null;
mLevelCount = 0;
}
public synchronized void setRegionDecoder(BitmapRegionDecoder decoder) {
mRegionDecoder = Utils.checkNotNull(decoder);
mImageWidth = decoder.getWidth();
mImageHeight = decoder.getHeight();
mLevelCount = calculateLevelCount();
}
private int calculateLevelCount() {
return Math.max(0, Utils.ceilLog2(
(float) mImageWidth / mScreenNail.getWidth()));
}
// Gets a sub image on a rectangle of the current photo. For example,
// getTile(1, 50, 50, 100, 3, pool) means to get the region located
// at (50, 50) with sample level 1 (ie, down sampled by 2^1) and the
// target tile size (after sampling) 100 with border 3.
//
// From this spec, we can infer the actual tile size to be
// 100 + 3x2 = 106, and the size of the region to be extracted from the
// photo to be 200 with border 6.
//
// As a result, we should decode region (50-6, 50-6, 250+6, 250+6) or
// (44, 44, 256, 256) from the original photo and down sample it to 106.
@TargetApi(ApiHelper.VERSION_CODES.HONEYCOMB)
@Override
public Bitmap getTile(int level, int x, int y, int tileSize,
int borderSize, BitmapPool pool) {
if (!ApiHelper.HAS_REUSING_BITMAP_IN_BITMAP_REGION_DECODER) {
return getTileWithoutReusingBitmap(level, x, y, tileSize, borderSize);
}
int b = borderSize << level;
int t = tileSize << level;
Rect wantRegion = new Rect(x - b, y - b, x + t + b, y + t + b);
boolean needClear;
BitmapRegionDecoder regionDecoder = null;
synchronized (this) {
regionDecoder = mRegionDecoder;
if (regionDecoder == null) return null;
// We need to clear a reused bitmap, if wantRegion is not fully
// within the image.
needClear = !new Rect(0, 0, mImageWidth, mImageHeight)
.contains(wantRegion);
}
Bitmap bitmap = pool == null ? null : pool.getBitmap();
if (bitmap != null) {
if (needClear) bitmap.eraseColor(0);
} else {
int s = tileSize + 2 * borderSize;
bitmap = Bitmap.createBitmap(s, s, Config.ARGB_8888);
}
BitmapFactory.Options options = new BitmapFactory.Options();
options.inPreferredConfig = Config.ARGB_8888;
options.inPreferQualityOverSpeed = true;
options.inSampleSize = (1 << level);
options.inBitmap = bitmap;
try {
// In CropImage, we may call the decodeRegion() concurrently.
synchronized (regionDecoder) {
bitmap = regionDecoder.decodeRegion(wantRegion, options);
}
} finally {
if (options.inBitmap != bitmap && options.inBitmap != null) {
if (pool != null) pool.recycle(options.inBitmap);
options.inBitmap = null;
}
}
if (bitmap == null) {
Log.w(TAG, "fail in decoding region");
}
return bitmap;
}
private Bitmap getTileWithoutReusingBitmap(
int level, int x, int y, int tileSize, int borderSize) {
int b = borderSize << level;
int t = tileSize << level;
Rect wantRegion = new Rect(x - b, y - b, x + t + b, y + t + b);
BitmapRegionDecoder regionDecoder;
Rect overlapRegion;
synchronized (this) {
regionDecoder = mRegionDecoder;
if (regionDecoder == null) return null;
overlapRegion = new Rect(0, 0, mImageWidth, mImageHeight);
Utils.assertTrue(overlapRegion.intersect(wantRegion));
}
BitmapFactory.Options options = new BitmapFactory.Options();
options.inPreferredConfig = Config.ARGB_8888;
options.inPreferQualityOverSpeed = true;
options.inSampleSize = (1 << level);
Bitmap bitmap = null;
// In CropImage, we may call the decodeRegion() concurrently.
synchronized (regionDecoder) {
bitmap = regionDecoder.decodeRegion(overlapRegion, options);
}
if (bitmap == null) {
Log.w(TAG, "fail in decoding region");
}
if (wantRegion.equals(overlapRegion)) return bitmap;
int s = tileSize + 2 * borderSize;
Bitmap result = Bitmap.createBitmap(s, s, Config.ARGB_8888);
Canvas canvas = new Canvas(result);
canvas.drawBitmap(bitmap,
(overlapRegion.left - wantRegion.left) >> level,
(overlapRegion.top - wantRegion.top) >> level, null);
return result;
}
@Override
public ScreenNail getScreenNail() {
return mScreenNail;
}
@Override
public int getImageHeight() {
return mImageHeight;
}
@Override
public int getImageWidth() {
return mImageWidth;
}
@Override
public int getLevelCount() {
return mLevelCount;
}
}
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