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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.content.Context;
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 android.os.Build;
import android.os.Build.VERSION_CODES;
import android.util.Log;
import com.android.gallery3d.glrenderer.BasicTexture;
import com.android.gallery3d.glrenderer.BitmapTexture;
import com.android.photos.views.TiledImageRenderer;
import java.io.IOException;
/**
* A {@link com.android.photos.views.TiledImageRenderer.TileSource} using
* {@link BitmapRegionDecoder} to wrap a local file
*/
public class BitmapRegionTileSource implements TiledImageRenderer.TileSource {
private static final String TAG = "BitmapRegionTileSource";
private static final boolean REUSE_BITMAP =
Build.VERSION.SDK_INT >= VERSION_CODES.JELLY_BEAN;
private static final int MAX_PREVIEW_SIZE = 1024;
BitmapRegionDecoder mDecoder;
int mWidth;
int mHeight;
int mTileSize;
private BasicTexture mPreview;
private final int mRotation;
// For use only by getTile
private Rect mWantRegion = new Rect();
private Rect mOverlapRegion = new Rect();
private BitmapFactory.Options mOptions;
private Canvas mCanvas;
public BitmapRegionTileSource(Context context, String path, int previewSize, int rotation) {
mTileSize = TiledImageRenderer.suggestedTileSize(context);
mRotation = rotation;
try {
mDecoder = BitmapRegionDecoder.newInstance(path, true);
mWidth = mDecoder.getWidth();
mHeight = mDecoder.getHeight();
} catch (IOException e) {
Log.w("BitmapRegionTileSource", "ctor failed", e);
}
mOptions = new BitmapFactory.Options();
mOptions.inPreferredConfig = Bitmap.Config.ARGB_8888;
mOptions.inPreferQualityOverSpeed = true;
mOptions.inTempStorage = new byte[16 * 1024];
if (previewSize != 0) {
previewSize = Math.min(previewSize, MAX_PREVIEW_SIZE);
// Although this is the same size as the Bitmap that is likely already
// loaded, the lifecycle is different and interactions are on a different
// thread. Thus to simplify, this source will decode its own bitmap.
int sampleSize = (int) Math.ceil(Math.max(
mWidth / (float) previewSize, mHeight / (float) previewSize));
mOptions.inSampleSize = Math.max(sampleSize, 1);
Bitmap preview = mDecoder.decodeRegion(
new Rect(0, 0, mWidth, mHeight), mOptions);
if (preview.getWidth() <= MAX_PREVIEW_SIZE && preview.getHeight() <= MAX_PREVIEW_SIZE) {
mPreview = new BitmapTexture(preview);
} else {
Log.w(TAG, String.format(
"Failed to create preview of apropriate size! "
+ " in: %dx%d, sample: %d, out: %dx%d",
mWidth, mHeight, sampleSize,
preview.getWidth(), preview.getHeight()));
}
}
}
@Override
public int getTileSize() {
return mTileSize;
}
@Override
public int getImageWidth() {
return mWidth;
}
@Override
public int getImageHeight() {
return mHeight;
}
@Override
public BasicTexture getPreview() {
return mPreview;
}
@Override
public int getRotation() {
return mRotation;
}
@Override
public Bitmap getTile(int level, int x, int y, Bitmap bitmap) {
int tileSize = getTileSize();
if (!REUSE_BITMAP) {
return getTileWithoutReusingBitmap(level, x, y, tileSize);
}
int t = tileSize << level;
mWantRegion.set(x, y, x + t, y + t);
if (bitmap == null) {
bitmap = Bitmap.createBitmap(tileSize, tileSize, Bitmap.Config.ARGB_8888);
}
mOptions.inSampleSize = (1 << level);
mOptions.inBitmap = bitmap;
try {
bitmap = mDecoder.decodeRegion(mWantRegion, mOptions);
} finally {
if (mOptions.inBitmap != bitmap && mOptions.inBitmap != null) {
mOptions.inBitmap = null;
}
}
if (bitmap == null) {
Log.w("BitmapRegionTileSource", "fail in decoding region");
}
return bitmap;
}
private Bitmap getTileWithoutReusingBitmap(
int level, int x, int y, int tileSize) {
int t = tileSize << level;
mWantRegion.set(x, y, x + t, y + t);
mOverlapRegion.set(0, 0, mWidth, mHeight);
mOptions.inSampleSize = (1 << level);
Bitmap bitmap = mDecoder.decodeRegion(mOverlapRegion, mOptions);
if (bitmap == null) {
Log.w(TAG, "fail in decoding region");
}
if (mWantRegion.equals(mOverlapRegion)) {
return bitmap;
}
Bitmap result = Bitmap.createBitmap(tileSize, tileSize, Config.ARGB_8888);
if (mCanvas == null) {
mCanvas = new Canvas();
}
mCanvas.setBitmap(result);
mCanvas.drawBitmap(bitmap,
(mOverlapRegion.left - mWantRegion.left) >> level,
(mOverlapRegion.top - mWantRegion.top) >> level, null);
mCanvas.setBitmap(null);
return result;
}
}
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