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-rw-r--r--src/com/android/photos/BitmapRegionTileSource.java183
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diff --git a/src/com/android/photos/BitmapRegionTileSource.java b/src/com/android/photos/BitmapRegionTileSource.java
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+++ b/src/com/android/photos/BitmapRegionTileSource.java
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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;
+ }
+}