| /* |
| * 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; |
| } |
| } |