Android Open Source - imageCropLib Crop Util

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Back to project page imageCropLib.

License

The source code is released under:

GNU Lesser General Public License

Java Source Code

package com.mhk.android.croplib;
/*//w  w  w .  ja v a 2 s . c  o  m
 * Copyright (C) 2009 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.
 */



import java.io.Closeable;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;

import android.annotation.SuppressLint;
import android.content.ContentResolver;
import android.content.Context;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.BitmapRegionDecoder;
import android.graphics.Matrix;
import android.graphics.Rect;
import android.graphics.RectF;
import android.media.ExifInterface;
import android.net.Uri;
import android.opengl.GLES10;
import android.provider.MediaStore;
import android.text.TextUtils;
import android.util.Log;

/*
 * Modified from original in AOSP.
 */
@SuppressLint("NewApi")
public class CropUtil {

    private static final String SCHEME_FILE = "file";
    private static final String SCHEME_CONTENT = "content";
    private static final int SIZE_DEFAULT = 2048;
    private static final int SIZE_LIMIT = 4096;

    public static void closeSilently(Closeable c) {
        if (c == null) return;
        try {
            c.close();
        } catch (Throwable t) {
            // Do nothing
        }
    }

    public static int getExifRotation(File imageFile) {
        if (imageFile == null) return 0;
        try {
            ExifInterface exif = new ExifInterface(imageFile.getAbsolutePath());
            // We only recognize a subset of orientation tag values
            switch (exif.getAttributeInt(ExifInterface.TAG_ORIENTATION, ExifInterface.ORIENTATION_UNDEFINED)) {
                case ExifInterface.ORIENTATION_ROTATE_90:
                    return 90;
                case ExifInterface.ORIENTATION_ROTATE_180:
                    return 180;
                case ExifInterface.ORIENTATION_ROTATE_270:
                    return 270;
                default:
                    return ExifInterface.ORIENTATION_UNDEFINED;
            }
        } catch (IOException e) {
           
            return 0;
        }
    }

    public static boolean copyExifRotation(File sourceFile, File destFile) {
        if (sourceFile == null || destFile == null) return false;
        try {
            ExifInterface exifSource = new ExifInterface(sourceFile.getAbsolutePath());
            ExifInterface exifDest = new ExifInterface(destFile.getAbsolutePath());
            exifDest.setAttribute(ExifInterface.TAG_ORIENTATION, exifSource.getAttribute(ExifInterface.TAG_ORIENTATION));
            exifDest.saveAttributes();
            return true;
        } catch (IOException e) {
           
            return false;
        }
    }

    public static File getFromMediaUri(ContentResolver resolver, Uri uri) {
        if (uri == null) return null;

        if (SCHEME_FILE.equals(uri.getScheme())) {
            return new File(uri.getPath());
        } else if (SCHEME_CONTENT.equals(uri.getScheme())) {
            final String[] filePathColumn = { MediaStore.MediaColumns.DATA, MediaStore.MediaColumns.DISPLAY_NAME };
            Cursor cursor = null;
            try {
                cursor = resolver.query(uri, filePathColumn, null, null, null);
                if (cursor != null && cursor.moveToFirst()) {
                    final int columnIndex = (uri.toString().startsWith("content://com.google.android.gallery3d")) ?
                            cursor.getColumnIndex(MediaStore.MediaColumns.DISPLAY_NAME) :
                            cursor.getColumnIndex(MediaStore.MediaColumns.DATA);
                    // Picasa image on newer devices with Honeycomb and up
                    if (columnIndex != -1) {
                        String filePath = cursor.getString(columnIndex);
                        if (!TextUtils.isEmpty(filePath)) {
                            return new File(filePath);
                        }
                    }
                }
            } catch (SecurityException ignored) {
                // Nothing we can do
            } finally {
                if (cursor != null) cursor.close();
            }
        }
        return null;
    }
    
    public static Bitmap decodeRegionCrop(Context context, Uri sourceUri, Rect rect) {
        
      Bitmap croppedImage=null;
        InputStream is = null;
        try {
            is = context.getContentResolver().openInputStream(sourceUri);
            BitmapRegionDecoder decoder = BitmapRegionDecoder.newInstance(is, false);
            final int width = decoder.getWidth();
            final int height = decoder.getHeight();
            
            int exifRotation = CropUtil.getExifRotation(CropUtil.getFromMediaUri(context.getContentResolver(), sourceUri));
            
            if (exifRotation != 0) {
                // Adjust crop area to account for image rotation
                Matrix matrix = new Matrix();
                matrix.setRotate(-exifRotation);

                RectF adjusted = new RectF();
                matrix.mapRect(adjusted, new RectF(rect));

                // Adjust to account for origin at 0,0
                adjusted.offset(adjusted.left < 0 ? width : 0, adjusted.top < 0 ? height : 0);
                rect = new Rect((int) adjusted.left, (int) adjusted.top, (int) adjusted.right, (int) adjusted.bottom);
            }

            try {
                croppedImage = decoder.decodeRegion(rect, new BitmapFactory.Options());

            } catch (IllegalArgumentException e) {
                // Rethrow with some extra information
                throw new IllegalArgumentException("Rectangle " + rect + " is outside of the image ("
                        + width + "," + height + "," + exifRotation + ")", e);
            }

        } catch (IOException e) {
            
        } catch (OutOfMemoryError e) {
            
        } finally {
            CropUtil.closeSilently(is);
        }
        return croppedImage;
    }
    
    public static int calculateBitmapSampleSize(Context context, Uri bitmapUri) throws IOException {
        InputStream is = null;
        BitmapFactory.Options options = new BitmapFactory.Options();
        options.inJustDecodeBounds = true;
        try {
            is = context.getContentResolver().openInputStream(bitmapUri);
            BitmapFactory.decodeStream(is, null, options); // Just get image size
        } finally {
            CropUtil.closeSilently(is);
        }

        int maxSize = getMaxImageSize();
        int sampleSize = 1;
        while (options.outHeight / sampleSize > maxSize || options.outWidth / sampleSize > maxSize) {
            sampleSize = sampleSize << 1;
        }
        Log.d("SAMPLE", "max:"+maxSize+", sample:"+sampleSize);
        return sampleSize;
    }
    
    private static int getMaxImageSize() {
        int textureLimit = getMaxTextureSize();
        if (textureLimit == 0) {
            return SIZE_DEFAULT;
        } else {
            return Math.min(textureLimit, SIZE_LIMIT);
        }
    }

    private static int getMaxTextureSize() {
        // The OpenGL texture size is the maximum size that can be drawn in an ImageView
        int[] maxSize = new int[1];
        GLES10.glGetIntegerv(GLES10.GL_MAX_TEXTURE_SIZE, maxSize, 0);
        return maxSize[0];
    }
}

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