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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.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.Utils;
public class TileImageViewAdapter implements TileImageView.Model {
private static final String TAG = "TileImageViewAdapter";
protected BitmapRegionDecoder mRegionDecoder;
protected int mImageWidth;
protected int mImageHeight;
protected Bitmap mBackupImage;
protected int mLevelCount;
protected boolean mFailedToLoad;
public TileImageViewAdapter() {
}
public TileImageViewAdapter(Bitmap backup, BitmapRegionDecoder regionDecoder) {
mBackupImage = Utils.checkNotNull(backup);
mRegionDecoder = regionDecoder;
mImageWidth = regionDecoder.getWidth();
mImageHeight = regionDecoder.getHeight();
mLevelCount = calculateLevelCount();
}
public synchronized void clear() {
mBackupImage = null;
mImageWidth = 0;
mImageHeight = 0;
mLevelCount = 0;
mRegionDecoder = null;
mFailedToLoad = false;
}
public synchronized void setBackupImage(Bitmap backup, int width, int height) {
mBackupImage = Utils.checkNotNull(backup);
mImageWidth = width;
mImageHeight = height;
mRegionDecoder = null;
mLevelCount = 0;
mFailedToLoad = false;
}
public synchronized void setRegionDecoder(BitmapRegionDecoder decoder) {
mRegionDecoder = Utils.checkNotNull(decoder);
mImageWidth = decoder.getWidth();
mImageHeight = decoder.getHeight();
mLevelCount = calculateLevelCount();
mFailedToLoad = false;
}
private int calculateLevelCount() {
return Math.max(0, Utils.ceilLog2(
(float) mImageWidth / mBackupImage.getWidth()));
}
@Override
public synchronized Bitmap getTile(int level, int x, int y, int tileSize,
int borderSize) {
if (mRegionDecoder == null) return null;
// wantRegion is the rectangle on the original image we want. askRegion
// is the rectangle on the original image that we will ask from
// mRegionDecoder. Both are in the coordinates of the original image,
// not the coordinates of the scaled-down images.
Rect wantRegion = new Rect();
Rect askRegion = new Rect();
int b = borderSize << level;
wantRegion.set(x - b, y - b, x + (tileSize << level) + b,
y + (tileSize << level) + b);
// askRegion is the intersection of wantRegion and the original image.
askRegion.set(0, 0, mImageWidth, mImageHeight);
Utils.assertTrue(askRegion.intersect(wantRegion));
BitmapFactory.Options options = new BitmapFactory.Options();
options.inPreferredConfig = Config.ARGB_8888;
options.inPreferQualityOverSpeed = true;
options.inSampleSize = (1 << level);
Bitmap bitmap;
// In CropImage, we may call the decodeRegion() concurrently.
synchronized (mRegionDecoder) {
bitmap = mRegionDecoder.decodeRegion(askRegion, options);
}
if (bitmap == null) {
Log.w(TAG, "fail in decoding region");
return null;
}
if (wantRegion.equals(askRegion)) return bitmap;
// Now the wantRegion does not match the askRegion. This means we are at
// a boundary tile, and we need to add paddings. Create a new Bitmap
// and copy over.
int size = tileSize + 2 * borderSize;
Bitmap result = Bitmap.createBitmap(size, size, Config.ARGB_8888);
Canvas canvas = new Canvas(result);
int offsetX = (askRegion.left - wantRegion.left) >> level;
int offsetY = (askRegion.top - wantRegion.top) >> level;
canvas.drawBitmap(bitmap, offsetX, offsetY, null);
// If the valid region (covered by bitmap or border) is smaller than the
// result bitmap, subset it.
int endX = offsetX + bitmap.getWidth() + borderSize;
int endY = offsetY + bitmap.getHeight() + borderSize;
bitmap.recycle();
if (endX < size || endY < size) {
return Bitmap.createBitmap(result, 0, 0, Math.min(size, endX),
Math.min(size, endY));
} else {
return result;
}
}
@Override
public Bitmap getBackupImage() {
return mBackupImage;
}
@Override
public int getImageHeight() {
return mImageHeight;
}
@Override
public int getImageWidth() {
return mImageWidth;
}
@Override
public int getLevelCount() {
return mLevelCount;
}
public void setFailedToLoad() {
mFailedToLoad = true;
}
@Override
public boolean isFailedToLoad() {
return mFailedToLoad;
}
}
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