Add rotate support in Film Strip

Move the exif related code under src.com.android.camera.exif.
Refactor the member variables under LocalMediaData.java.
Refactor the LocalData to make sure they are immutables for thread safety.

bug:10367037
Change-Id: I0e84bcc0097925b2be749fe016984177a68e0a4d

1 files changed, 196 insertions, 0 deletions

diff --git a/src/com/android/camera/exif/ExifModifier.java b/src/com/android/camera/exif/ExifModifier.java
new file mode 100644
index 000000000..bed038c4a
--- /dev/null
+++ b/src/com/android/camera/exif/ExifModifier.java
@@ -0,0 +1,196 @@
+/*
+ * Copyright (C) 2012 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.camera.exif;
+
+import android.util.Log;
+
+import java.io.Closeable;
+import java.io.IOException;
+import java.io.InputStream;
+import java.nio.ByteBuffer;
+import java.nio.ByteOrder;
+import java.util.ArrayList;
+import java.util.List;
+
+class ExifModifier {
+    public static final String TAG = "ExifModifier";
+    public static final boolean DEBUG = false;
+    private final ByteBuffer mByteBuffer;
+    private final ExifData mTagToModified;
+    private final List<TagOffset> mTagOffsets = new ArrayList<TagOffset>();
+    private final ExifInterface mInterface;
+    private int mOffsetBase;
+
+    private static class TagOffset {
+        final int mOffset;
+        final ExifTag mTag;
+
+        TagOffset(ExifTag tag, int offset) {
+            mTag = tag;
+            mOffset = offset;
+        }
+    }
+
+    protected ExifModifier(ByteBuffer byteBuffer, ExifInterface iRef) throws IOException,
+            ExifInvalidFormatException {
+        mByteBuffer = byteBuffer;
+        mOffsetBase = byteBuffer.position();
+        mInterface = iRef;
+        InputStream is = null;
+        try {
+            is = new ByteBufferInputStream(byteBuffer);
+            // Do not require any IFD;
+            ExifParser parser = ExifParser.parse(is, mInterface);
+            mTagToModified = new ExifData(parser.getByteOrder());
+            mOffsetBase += parser.getTiffStartPosition();
+            mByteBuffer.position(0);
+        } finally {
+            ExifInterface.closeSilently(is);
+        }
+    }
+
+    protected ByteOrder getByteOrder() {
+        return mTagToModified.getByteOrder();
+    }
+
+    protected boolean commit() throws IOException, ExifInvalidFormatException {
+        InputStream is = null;
+        try {
+            is = new ByteBufferInputStream(mByteBuffer);
+            int flag = 0;
+            IfdData[] ifdDatas = new IfdData[] {
+                    mTagToModified.getIfdData(IfdId.TYPE_IFD_0),
+                    mTagToModified.getIfdData(IfdId.TYPE_IFD_1),
+                    mTagToModified.getIfdData(IfdId.TYPE_IFD_EXIF),
+                    mTagToModified.getIfdData(IfdId.TYPE_IFD_INTEROPERABILITY),
+                    mTagToModified.getIfdData(IfdId.TYPE_IFD_GPS)
+            };
+
+            if (ifdDatas[IfdId.TYPE_IFD_0] != null) {
+                flag |= ExifParser.OPTION_IFD_0;
+            }
+            if (ifdDatas[IfdId.TYPE_IFD_1] != null) {
+                flag |= ExifParser.OPTION_IFD_1;
+            }
+            if (ifdDatas[IfdId.TYPE_IFD_EXIF] != null) {
+                flag |= ExifParser.OPTION_IFD_EXIF;
+            }
+            if (ifdDatas[IfdId.TYPE_IFD_GPS] != null) {
+                flag |= ExifParser.OPTION_IFD_GPS;
+            }
+            if (ifdDatas[IfdId.TYPE_IFD_INTEROPERABILITY] != null) {
+                flag |= ExifParser.OPTION_IFD_INTEROPERABILITY;
+            }
+
+            ExifParser parser = ExifParser.parse(is, flag, mInterface);
+            int event = parser.next();
+            IfdData currIfd = null;
+            while (event != ExifParser.EVENT_END) {
+                switch (event) {
+                    case ExifParser.EVENT_START_OF_IFD:
+                        currIfd = ifdDatas[parser.getCurrentIfd()];
+                        if (currIfd == null) {
+                            parser.skipRemainingTagsInCurrentIfd();
+                        }
+                        break;
+                    case ExifParser.EVENT_NEW_TAG:
+                        ExifTag oldTag = parser.getTag();
+                        ExifTag newTag = currIfd.getTag(oldTag.getTagId());
+                        if (newTag != null) {
+                            if (newTag.getComponentCount() != oldTag.getComponentCount()
+                                    || newTag.getDataType() != oldTag.getDataType()) {
+                                return false;
+                            } else {
+                                mTagOffsets.add(new TagOffset(newTag, oldTag.getOffset()));
+                                currIfd.removeTag(oldTag.getTagId());
+                                if (currIfd.getTagCount() == 0) {
+                                    parser.skipRemainingTagsInCurrentIfd();
+                                }
+                            }
+                        }
+                        break;
+                }
+                event = parser.next();
+            }
+            for (IfdData ifd : ifdDatas) {
+                if (ifd != null && ifd.getTagCount() > 0) {
+                    return false;
+                }
+            }
+            modify();
+        } finally {
+            ExifInterface.closeSilently(is);
+        }
+        return true;
+    }
+
+    private void modify() {
+        mByteBuffer.order(getByteOrder());
+        for (TagOffset tagOffset : mTagOffsets) {
+            writeTagValue(tagOffset.mTag, tagOffset.mOffset);
+        }
+    }
+
+    private void writeTagValue(ExifTag tag, int offset) {
+        if (DEBUG) {
+            Log.v(TAG, "modifying tag to: \n" + tag.toString());
+            Log.v(TAG, "at offset: " + offset);
+        }
+        mByteBuffer.position(offset + mOffsetBase);
+        switch (tag.getDataType()) {
+            case ExifTag.TYPE_ASCII:
+                byte buf[] = tag.getStringByte();
+                if (buf.length == tag.getComponentCount()) {
+                    buf[buf.length - 1] = 0;
+                    mByteBuffer.put(buf);
+                } else {
+                    mByteBuffer.put(buf);
+                    mByteBuffer.put((byte) 0);
+                }
+                break;
+            case ExifTag.TYPE_LONG:
+            case ExifTag.TYPE_UNSIGNED_LONG:
+                for (int i = 0, n = tag.getComponentCount(); i < n; i++) {
+                    mByteBuffer.putInt((int) tag.getValueAt(i));
+                }
+                break;
+            case ExifTag.TYPE_RATIONAL:
+            case ExifTag.TYPE_UNSIGNED_RATIONAL:
+                for (int i = 0, n = tag.getComponentCount(); i < n; i++) {
+                    Rational v = tag.getRational(i);
+                    mByteBuffer.putInt((int) v.getNumerator());
+                    mByteBuffer.putInt((int) v.getDenominator());
+                }
+                break;
+            case ExifTag.TYPE_UNDEFINED:
+            case ExifTag.TYPE_UNSIGNED_BYTE:
+                buf = new byte[tag.getComponentCount()];
+                tag.getBytes(buf);
+                mByteBuffer.put(buf);
+                break;
+            case ExifTag.TYPE_UNSIGNED_SHORT:
+                for (int i = 0, n = tag.getComponentCount(); i < n; i++) {
+                    mByteBuffer.putShort((short) tag.getValueAt(i));
+                }
+                break;
+        }
+    }
+
+    public void modifyTag(ExifTag tag) {
+        mTagToModified.addTag(tag);
+    }
+}