1 files changed, 81 insertions, 0 deletions
diff --git a/src/com/android/gallery3d/common/BitmapUtils.java b/src/com/android/gallery3d/common/BitmapUtils.java
new file mode 100644
index 0000000..9ac5c1b
--- /dev/null
+++ b/src/com/android/gallery3d/common/BitmapUtils.java
@@ -0,0 +1,81 @@
+/*
+ * 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.common;
+
+import android.content.Context;
+import android.content.res.Resources;
+import android.net.Uri;
+import android.util.Log;
+
+import com.android.gallery3d.exif.ExifInterface;
+
+import java.io.BufferedInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+
+public class BitmapUtils {
+
+    private static final String TAG = "BitmapUtils";
+
+    // Find the min x that 1 / x >= scale
+    public static int computeSampleSizeLarger(float scale) {
+        int initialSize = (int) Math.floor(1f / scale);
+        if (initialSize <= 1) return 1;
+
+        return initialSize <= 8
+                ? Utils.prevPowerOf2(initialSize)
+                : initialSize / 8 * 8;
+    }
+
+    public static int getRotationFromExif(Context context, Uri uri) {
+        return BitmapUtils.getRotationFromExifHelper(null, 0, context, uri);
+    }
+
+    public static int getRotationFromExif(Resources res, int resId) {
+        return BitmapUtils.getRotationFromExifHelper(res, resId, null, null);
+    }
+
+    private static int getRotationFromExifHelper(Resources res, int resId, Context context, Uri uri) {
+        ExifInterface ei = new ExifInterface();
+        InputStream is = null;
+        BufferedInputStream bis = null;
+        try {
+            if (uri != null) {
+                is = context.getContentResolver().openInputStream(uri);
+                bis = new BufferedInputStream(is);
+                ei.readExif(bis);
+            } else {
+                is = res.openRawResource(resId);
+                bis = new BufferedInputStream(is);
+                ei.readExif(bis);
+            }
+            Integer ori = ei.getTagIntValue(ExifInterface.TAG_ORIENTATION);
+            if (ori != null) {
+                return ExifInterface.getRotationForOrientationValue(ori.shortValue());
+            }
+        } catch (IOException e) {
+            Log.w(TAG, "Getting exif data failed", e);
+        } catch (NullPointerException e) {
+            // Sometimes the ExifInterface has an internal NPE if Exif data isn't valid
+            Log.w(TAG, "Getting exif data failed", e);
+        } finally {
+            Utils.closeSilently(bis);
+            Utils.closeSilently(is);
+        }
+        return 0;
+    }
+}