+++ /dev/null
-/*
- * Copyright (C) 2007 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;
-
-import java.util.HashMap;
-import java.util.Map;
-
-/**
- * Wrapper for native Exif library
- */
-public class ExifInterface {
-
- private final String mFilename;
-
- // Constants used for the Orientation Exif tag.
- public static final int ORIENTATION_UNDEFINED = 0;
- public static final int ORIENTATION_NORMAL = 1;
-
- // Constants used for white balance
- public static final int WHITEBALANCE_AUTO = 0;
- public static final int WHITEBALANCE_MANUAL = 1;
-
- // left right reversed mirror
- public static final int ORIENTATION_FLIP_HORIZONTAL = 2;
- public static final int ORIENTATION_ROTATE_180 = 3;
-
- // upside down mirror
- public static final int ORIENTATION_FLIP_VERTICAL = 4;
-
- // flipped about top-left <--> bottom-right axis
- public static final int ORIENTATION_TRANSPOSE = 5;
-
- // rotate 90 cw to right it
- public static final int ORIENTATION_ROTATE_90 = 6;
-
- // flipped about top-right <--> bottom-left axis
- public static final int ORIENTATION_TRANSVERSE = 7;
-
- // rotate 270 to right it
- public static final int ORIENTATION_ROTATE_270 = 8;
-
- // The Exif tag names
- public static final String TAG_ORIENTATION = "Orientation";
-
- static final String TAG_DATE_TIME_ORIGINAL = "DateTimeOriginal";
- static final String TAG_MAKE = "Make";
- static final String TAG_MODEL = "Model";
- static final String TAG_FLASH = "Flash";
- static final String TAG_IMAGE_WIDTH = "ImageWidth";
- static final String TAG_IMAGE_LENGTH = "ImageLength";
-
- static final String TAG_GPS_LATITUDE = "GPSLatitude";
- static final String TAG_GPS_LONGITUDE = "GPSLongitude";
-
- static final String TAG_GPS_LATITUDE_REF = "GPSLatitudeRef";
- static final String TAG_GPS_LONGITUDE_REF = "GPSLongitudeRef";
- static final String TAG_WHITE_BALANCE = "WhiteBalance";
-
- private boolean mSavedAttributes = false;
- private boolean mHasThumbnail = false;
- private HashMap<String, String> mCachedAttributes = null;
-
- static {
- System.loadLibrary("exif");
- }
-
- public ExifInterface(String fileName) {
- mFilename = fileName;
- }
-
- /**
- * Given a HashMap of Exif tags and associated values, an Exif section in
- * the JPG file is created and loaded with the tag data. saveAttributes()
- * is expensive because it involves copying all the JPG data from one file
- * to another and deleting the old file and renaming the other. It's best
- * to collect all the attributes to write and make a single call rather
- * than multiple calls for each attribute. You must call "commitChanges()"
- * at some point to commit the changes.
- */
- public void saveAttributes(HashMap<String, String> attributes) {
- // format of string passed to native C code:
- // "attrCnt attr1=valueLen value1attr2=value2Len value2..."
- // example:
- // "4 attrPtr ImageLength=4 1024Model=6 FooImageWidth=4 1280Make=3 FOO"
- StringBuilder sb = new StringBuilder();
- int size = attributes.size();
- if (attributes.containsKey("hasThumbnail")) {
- --size;
- }
- sb.append(size + " ");
- for (Map.Entry<String, String> iter : attributes.entrySet()) {
- String key = iter.getKey();
- if (key.equals("hasThumbnail")) {
- // this is a fake attribute not saved as an exif tag
- continue;
- }
- String val = iter.getValue();
- sb.append(key + "=");
- sb.append(val.length() + " ");
- sb.append(val);
- }
- String s = sb.toString();
- saveAttributesNative(mFilename, s);
- commitChangesNative(mFilename);
- mSavedAttributes = true;
- }
-
- /**
- * Returns a HashMap loaded with the Exif attributes of the file. The key
- * is the standard tag name and the value is the tag's value: e.g.
- * Model -> Nikon. Numeric values are returned as strings.
- */
- public HashMap<String, String> getAttributes() {
- if (mCachedAttributes != null) {
- return mCachedAttributes;
- }
- // format of string passed from native C code:
- // "attrCnt attr1=valueLen value1attr2=value2Len value2..."
- // example:
- // "4 attrPtr ImageLength=4 1024Model=6 FooImageWidth=4 1280Make=3 FOO"
- mCachedAttributes = new HashMap<String, String>();
-
- String attrStr = getAttributesNative(mFilename);
-
- // get count
- int ptr = attrStr.indexOf(' ');
- int count = Integer.parseInt(attrStr.substring(0, ptr));
- // skip past the space between item count and the rest of the attributes
- ++ptr;
-
- for (int i = 0; i < count; i++) {
- // extract the attribute name
- int equalPos = attrStr.indexOf('=', ptr);
- String attrName = attrStr.substring(ptr, equalPos);
- ptr = equalPos + 1; // skip past =
-
- // extract the attribute value length
- int lenPos = attrStr.indexOf(' ', ptr);
- int attrLen = Integer.parseInt(attrStr.substring(ptr, lenPos));
- ptr = lenPos + 1; // skip pas the space
-
- // extract the attribute value
- String attrValue = attrStr.substring(ptr, ptr + attrLen);
- ptr += attrLen;
-
- if (attrName.equals("hasThumbnail")) {
- mHasThumbnail = attrValue.equalsIgnoreCase("true");
- } else {
- mCachedAttributes.put(attrName, attrValue);
- }
- }
- return mCachedAttributes;
- }
-
- /**
- * Given a numerical white balance value, return a
- * human-readable string describing it.
- */
- public static String whiteBalanceToString(int whitebalance) {
- switch (whitebalance) {
- case WHITEBALANCE_AUTO:
- return "Auto";
- case WHITEBALANCE_MANUAL:
- return "Manual";
- default:
- return "";
- }
- }
-
- /**
- * Given a numerical orientation, return a human-readable string describing
- * the orientation.
- */
- public static String orientationToString(int orientation) {
- // TODO: this function needs to be localized and use string resource ids
- // rather than strings
- String orientationString;
- switch (orientation) {
- case ORIENTATION_NORMAL:
- orientationString = "Normal";
- break;
- case ORIENTATION_FLIP_HORIZONTAL:
- orientationString = "Flipped horizontal";
- break;
- case ORIENTATION_ROTATE_180:
- orientationString = "Rotated 180 degrees";
- break;
- case ORIENTATION_FLIP_VERTICAL:
- orientationString = "Upside down mirror";
- break;
- case ORIENTATION_TRANSPOSE:
- orientationString = "Transposed";
- break;
- case ORIENTATION_ROTATE_90:
- orientationString = "Rotated 90 degrees";
- break;
- case ORIENTATION_TRANSVERSE:
- orientationString = "Transversed";
- break;
- case ORIENTATION_ROTATE_270:
- orientationString = "Rotated 270 degrees";
- break;
- default:
- orientationString = "Undefined";
- break;
- }
- return orientationString;
- }
-
- /**
- * Copies the thumbnail data out of the filename and puts it in the Exif
- * data associated with the file used to create this object. You must call
- * "commitChanges()" at some point to commit the changes.
- */
- public boolean appendThumbnail(String thumbnailFileName) {
- if (!mSavedAttributes) {
- throw new RuntimeException("Must call saveAttributes "
- + "before calling appendThumbnail");
- }
- mHasThumbnail = appendThumbnailNative(mFilename, thumbnailFileName);
- return mHasThumbnail;
- }
-
- public boolean hasThumbnail() {
- if (!mSavedAttributes) {
- getAttributes();
- }
- return mHasThumbnail;
- }
-
- public byte[] getThumbnail() {
- return getThumbnailNative(mFilename);
- }
-
- public static float convertRationalLatLonToFloat(
- String rationalString, String ref) {
- try {
- String [] parts = rationalString.split(",");
-
- String [] pair;
- pair = parts[0].split("/");
- int degrees = (int) (Float.parseFloat(pair[0].trim())
- / Float.parseFloat(pair[1].trim()));
-
- pair = parts[1].split("/");
- int minutes = (int) ((Float.parseFloat(pair[0].trim())
- / Float.parseFloat(pair[1].trim())));
-
- pair = parts[2].split("/");
- float seconds = Float.parseFloat(pair[0].trim())
- / Float.parseFloat(pair[1].trim());
-
- float result = degrees + (minutes / 60F) + (seconds / (60F * 60F));
- if ((ref.equals("S") || ref.equals("W"))) {
- return -result;
- }
- return result;
- } catch (RuntimeException ex) {
- // if for whatever reason we can't parse the lat long then return
- // null
- return 0f;
- }
- }
-
- public static String convertRationalLatLonToDecimalString(
- String rationalString, String ref, boolean usePositiveNegative) {
- float result = convertRationalLatLonToFloat(rationalString, ref);
-
- String preliminaryResult = String.valueOf(result);
- if (usePositiveNegative) {
- String neg = (ref.equals("S") || ref.equals("E")) ? "-" : "";
- return neg + preliminaryResult;
- } else {
- return preliminaryResult + String.valueOf((char) 186) + " "
- + ref;
- }
- }
-
- public static String makeLatLongString(double d) {
- d = Math.abs(d);
-
- int degrees = (int) d;
-
- double remainder = d - degrees;
- int minutes = (int) (remainder * 60D);
- // really seconds * 1000
- int seconds = (int) (((remainder * 60D) - minutes) * 60D * 1000D);
-
- String retVal = degrees + "/1," + minutes + "/1," + seconds + "/1000";
- return retVal;
- }
-
- public static String makeLatStringRef(double lat) {
- return lat >= 0D ? "N" : "S";
- }
-
- public static String makeLonStringRef(double lon) {
- return lon >= 0D ? "W" : "E";
- }
-
- private native boolean appendThumbnailNative(String fileName,
- String thumbnailFileName);
-
- private native void saveAttributesNative(String fileName,
- String compressedAttributes);
-
- private native String getAttributesNative(String fileName);
-
- private native void commitChangesNative(String fileName);
-
- private native byte[] getThumbnailNative(String fileName);
-}
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