1 files changed, 109 insertions, 0 deletions
diff --git a/src/com/android/photos/data/FileRetriever.java b/src/com/android/photos/data/FileRetriever.java
new file mode 100644
index 000000000..eb7686ef6
--- /dev/null
+++ b/src/com/android/photos/data/FileRetriever.java
@@ -0,0 +1,109 @@
+/*
+ * 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.data;
+
+import android.graphics.Bitmap;
+import android.media.ExifInterface;
+import android.net.Uri;
+import android.util.Log;
+import android.webkit.MimeTypeMap;
+
+import com.android.gallery3d.common.BitmapUtils;
+
+import java.io.File;
+import java.io.IOException;
+
+public class FileRetriever implements MediaRetriever {
+    private static final String TAG = FileRetriever.class.getSimpleName();
+
+    @Override
+    public File getLocalFile(Uri contentUri) {
+        return new File(contentUri.getPath());
+    }
+
+    @Override
+    public MediaSize getFastImageSize(Uri contentUri, MediaSize size) {
+        if (isVideo(contentUri)) {
+            return null;
+        }
+        return MediaSize.TemporaryThumbnail;
+    }
+
+    @Override
+    public byte[] getTemporaryImage(Uri contentUri, MediaSize fastImageSize) {
+
+        try {
+            ExifInterface exif = new ExifInterface(contentUri.getPath());
+            if (exif.hasThumbnail()) {
+                return exif.getThumbnail();
+            }
+        } catch (IOException e) {
+            Log.w(TAG, "Unable to load exif for " + contentUri);
+        }
+        return null;
+    }
+
+    @Override
+    public boolean getMedia(Uri contentUri, MediaSize imageSize, File tempFile) {
+        if (imageSize == MediaSize.Original) {
+            return false; // getLocalFile should always return the original.
+        }
+        if (imageSize == MediaSize.Thumbnail) {
+            File preview = MediaCache.getInstance().getCachedFile(contentUri, MediaSize.Preview);
+            if (preview != null) {
+                // Just downsample the preview, it is faster.
+                return MediaCacheUtils.downsample(preview, imageSize, tempFile);
+            }
+        }
+        File highRes = new File(contentUri.getPath());
+        boolean success;
+        if (!isVideo(contentUri)) {
+            success = MediaCacheUtils.downsample(highRes, imageSize, tempFile);
+        } else {
+            // Video needs to extract the bitmap.
+            Bitmap bitmap = BitmapUtils.createVideoThumbnail(highRes.getPath());
+            if (bitmap == null) {
+                return false;
+            } else if (imageSize == MediaSize.Thumbnail
+                    && !MediaCacheUtils.needsDownsample(bitmap, MediaSize.Preview)
+                    && MediaCacheUtils.writeToFile(bitmap, tempFile)) {
+                // Opportunistically save preview
+                MediaCache mediaCache = MediaCache.getInstance();
+                mediaCache.insertIntoCache(contentUri, MediaSize.Preview, tempFile);
+            }
+            // Now scale the image
+            success = MediaCacheUtils.downsample(bitmap, imageSize, tempFile);
+        }
+        return success;
+    }
+
+    @Override
+    public Uri normalizeUri(Uri contentUri, MediaSize size) {
+        return contentUri;
+    }
+
+    @Override
+    public MediaSize normalizeMediaSize(Uri contentUri, MediaSize size) {
+        return size;
+    }
+
+    private static boolean isVideo(Uri uri) {
+        MimeTypeMap mimeTypeMap = MimeTypeMap.getSingleton();
+        String extension = MimeTypeMap.getFileExtensionFromUrl(uri.toString());
+        String mimeType = mimeTypeMap.getMimeTypeFromExtension(extension);
+        return (mimeType != null && mimeType.startsWith("video/"));
+    }
+}