1 files changed, 87 insertions, 0 deletions
diff --git a/src/com/android/photos/BitmapRegionTileSource.java b/src/com/android/photos/BitmapRegionTileSource.java
new file mode 100644
index 000000000..1c7115191
--- /dev/null
+++ b/src/com/android/photos/BitmapRegionTileSource.java
@@ -0,0 +1,87 @@
+/*
+ * 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.graphics.Bitmap;
+import android.graphics.BitmapFactory;
+import android.graphics.BitmapRegionDecoder;
+import android.graphics.Rect;
+import android.util.Log;
+import com.android.photos.views.TiledImageRenderer;
+
+import java.io.IOException;
+
+public class BitmapRegionTileSource implements TiledImageRenderer.TileSource {
+
+    BitmapRegionDecoder mDecoder;
+
+
+    public BitmapRegionTileSource(String path) {
+        try {
+            mDecoder = BitmapRegionDecoder.newInstance(path, true);
+        } catch (IOException e) {
+            Log.w("BitmapRegionTileSource", "ctor failed", e);
+        }
+    }
+
+    @Override
+    public int getTileSize() {
+        return 256;
+    }
+
+    @Override
+    public int getImageWidth() {
+        return mDecoder.getWidth();
+    }
+
+    @Override
+    public int getImageHeight() {
+        return mDecoder.getHeight();
+    }
+
+    @Override
+    public Bitmap getTile(int level, int x, int y, Bitmap bitmap) {
+        int tileSize = getTileSize();
+        int t = tileSize << level;
+
+        Rect wantRegion = new Rect(x, y, x + t, y + t);
+
+        if (bitmap == null) {
+            bitmap = Bitmap.createBitmap(tileSize, tileSize, Bitmap.Config.ARGB_8888);
+        }
+
+        BitmapFactory.Options options = new BitmapFactory.Options();
+        options.inPreferredConfig = Bitmap.Config.ARGB_8888;
+        options.inPreferQualityOverSpeed = true;
+        options.inSampleSize =  (1 << level);
+        options.inBitmap = bitmap;
+
+        try {
+            // In CropImage, we may call the decodeRegion() concurrently.
+            bitmap = mDecoder.decodeRegion(wantRegion, options);
+        } finally {
+            if (options.inBitmap != bitmap && options.inBitmap != null) {
+                options.inBitmap = null;
+            }
+        }
+
+        if (bitmap == null) {
+            Log.w("BitmapRegionTileSource", "fail in decoding region");
+        }
+        return bitmap;
+    }
+}