From 1a833d67f22eefcbc5a76a104d0857a5b1064433 Mon Sep 17 00:00:00 2001
From: George Mount <mount@google.com>
Date: Mon, 20 May 2013 16:54:09 -0700
Subject: Combine code for bitmap decoding and add byte array decoding.

Change-Id: Id780f94a5d939e5423b87f2e1d4ddf18b3dfa126
---
 src/com/android/photos/data/BitmapDecoder.java | 118 ++++++++++++++++---------
 1 file changed, 78 insertions(+), 40 deletions(-)

(limited to 'src/com/android/photos/data/BitmapDecoder.java')

diff --git a/src/com/android/photos/data/BitmapDecoder.java b/src/com/android/photos/data/BitmapDecoder.java
index f19808d06..3e5a0f778 100644
--- a/src/com/android/photos/data/BitmapDecoder.java
+++ b/src/com/android/photos/data/BitmapDecoder.java
@@ -18,6 +18,7 @@ package com.android.photos.data;
 import android.graphics.Bitmap;
 import android.graphics.Bitmap.Config;
 import android.graphics.BitmapFactory;
+import android.graphics.BitmapFactory.Options;
 import android.util.Log;
 import android.util.Pools.Pool;
 import android.util.Pools.SynchronizedPool;
@@ -46,57 +47,100 @@ public class BitmapDecoder {
     private static final Pool<BitmapFactory.Options> sOptions =
             new SynchronizedPool<BitmapFactory.Options>(POOL_SIZE);
 
-    public static Bitmap decode(InputStream in) {
-        BitmapFactory.Options opts = getOptions();
+    private interface Decoder<T> {
+        Bitmap decode(T input, BitmapFactory.Options options);
+
+        boolean decodeBounds(T input, BitmapFactory.Options options);
+    }
+
+    private static abstract class OnlyDecode<T> implements Decoder<T> {
+        @Override
+        public boolean decodeBounds(T input, BitmapFactory.Options options) {
+            decode(input, options);
+            return true;
+        }
+    }
+
+    private static final Decoder<InputStream> sStreamDecoder = new Decoder<InputStream>() {
+        @Override
+        public Bitmap decode(InputStream is, Options options) {
+            return BitmapFactory.decodeStream(is, null, options);
+        }
+
+        @Override
+        public boolean decodeBounds(InputStream is, Options options) {
+            is.mark(HEADER_MAX_SIZE);
+            BitmapFactory.decodeStream(is, null, options);
+            try {
+                is.reset();
+                return true;
+            } catch (IOException e) {
+                Log.e(TAG, "Could not decode stream to bitmap", e);
+                return false;
+            }
+        }
+    };
+
+    private static final Decoder<String> sFileDecoder = new OnlyDecode<String>() {
+        @Override
+        public Bitmap decode(String filePath, Options options) {
+            return BitmapFactory.decodeFile(filePath, options);
+        }
+    };
+
+    private static final Decoder<byte[]> sByteArrayDecoder = new OnlyDecode<byte[]>() {
+        @Override
+        public Bitmap decode(byte[] data, Options options) {
+            return BitmapFactory.decodeByteArray(data, 0, data.length, options);
+        }
+    };
+
+    private static <T> Bitmap delegateDecode(Decoder<T> decoder, T input) {
+        BitmapFactory.Options options = getOptions();
         try {
-            if (!in.markSupported()) {
-                in = new BufferedInputStream(in);
+            options.inJustDecodeBounds = true;
+            if (!decoder.decodeBounds(input, options)) {
+                return null;
             }
-            opts.inJustDecodeBounds = true;
-            in.mark(HEADER_MAX_SIZE);
-            BitmapFactory.decodeStream(in, null, opts);
-            in.reset();
-            opts.inJustDecodeBounds = false;
+            options.inJustDecodeBounds = false;
             GalleryBitmapPool pool = GalleryBitmapPool.getInstance();
-            Bitmap reuseBitmap = pool.get(opts.outWidth, opts.outHeight);
-            opts.inBitmap = reuseBitmap;
-            Bitmap decodedBitmap = BitmapFactory.decodeStream(in, null, opts);
+            Bitmap reuseBitmap = pool.get(options.outWidth, options.outHeight);
+            options.inBitmap = reuseBitmap;
+            Bitmap decodedBitmap = decoder.decode(input, options);
             if (reuseBitmap != null && decodedBitmap != reuseBitmap) {
                 pool.put(reuseBitmap);
             }
             return decodedBitmap;
-        } catch (IOException e) {
-            Log.e(TAG, "Could not decode stream to bitmap", e);
-            return null;
         } finally {
-            Utils.closeSilently(in);
-            release(opts);
+            options.inBitmap = null;
+            options.inJustDecodeBounds = false;
+            sOptions.release(options);
         }
     }
 
-    public static Bitmap decode(File in) {
-        return decodeFile(in.toString());
-    }
-
-    public static Bitmap decodeFile(String in) {
-        BitmapFactory.Options opts = getOptions();
+    public static Bitmap decode(InputStream in) {
         try {
-            opts.inJustDecodeBounds = true;
-            BitmapFactory.decodeFile(in, opts);
-            opts.inJustDecodeBounds = false;
-            GalleryBitmapPool pool = GalleryBitmapPool.getInstance();
-            Bitmap reuseBitmap = pool.get(opts.outWidth, opts.outHeight);
-            opts.inBitmap = reuseBitmap;
-            Bitmap decodedBitmap = BitmapFactory.decodeFile(in, opts);
-            if (reuseBitmap != null && decodedBitmap != reuseBitmap) {
-                pool.put(reuseBitmap);
+            if (!in.markSupported()) {
+                in = new BufferedInputStream(in);
             }
-            return decodedBitmap;
+            return delegateDecode(sStreamDecoder, in);
         } finally {
-            release(opts);
+            Utils.closeSilently(in);
         }
     }
 
+    public static Bitmap decode(File file) {
+        return decodeFile(file.getPath());
+    }
+
+    public static Bitmap decodeFile(String path) {
+        return delegateDecode(sFileDecoder, path);
+    }
+
+    public static Bitmap decodeByteArray(byte[] data) {
+        return delegateDecode(sByteArrayDecoder, data);
+    }
+
     public static void put(Bitmap bitmap) {
         GalleryBitmapPool.getInstance().put(bitmap);
     }
@@ -113,10 +157,4 @@ public class BitmapDecoder {
 
         return opts;
     }
-
-    private static void release(BitmapFactory.Options opts) {
-        opts.inBitmap = null;
-        opts.inJustDecodeBounds = false;
-        sOptions.release(opts);
-    }
 }
-- 
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