Android Open Source - AndroidMediaDB Image Resizer

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The source code is released under:
Apache License
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Java Source Code

///*
// * Copyright (C) 2012 The Android Open Source Project
// */* ww w.  j a  va 2s. com*/
// * 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.example.android.displayingbitmaps.util;
//
//import android.annotation.TargetApi;
//import android.content.Context;
//import android.content.res.Resources;
//import android.graphics.Bitmap;
//import android.graphics.BitmapFactory;
//import android.os.Build;
//import android.util.Log;
//
//import com.example.android.displayingbitmaps.BuildConfig;
//
//import java.io.FileDescriptor;
//
///**
// * A simple subclass of {@link ImageWorker} that resizes images from resources given a target width
// * and height. Useful for when the input images might be too large to simply load directly into
// * memory.
// */
//public class ImageResizer extends ImageWorker {
//    private static final String TAG = "ImageResizer";
//    protected int mImageWidth;
//    protected int mImageHeight;
//
//    /**
//     * Initialize providing a single target image size (used for both width and height);
//     *
//     * @param context
//     * @param imageWidth
//     * @param imageHeight
//     */
//    public ImageResizer(Context context, int imageWidth, int imageHeight) {
//        super(context);
//        setImageSize(imageWidth, imageHeight);
//    }
//
//    /**
//     * Initialize providing a single target image size (used for both width and height);
//     *
//     * @param context
//     * @param imageSize
//     */
//    public ImageResizer(Context context, int imageSize) {
//        super(context);
//        setImageSize(imageSize);
//    }
//
//    /**
//     * Set the target image width and height.
//     *
//     * @param width
//     * @param height
//     */
//    public void setImageSize(int width, int height) {
//        mImageWidth = width;
//        mImageHeight = height;
//    }
//
//    /**
//     * Set the target image size (width and height will be the same).
//     *
//     * @param size
//     */
//    public void setImageSize(int size) {
//        setImageSize(size, size);
//    }
//
//    /**
//     * The main processing method. This happens in a background task. In this case we are just
//     * sampling down the bitmap and returning it from a resource.
//     *
//     * @param resId
//     * @return
//     */
//    private Bitmap processBitmap(int resId) {
//            Log.d(TAG, "processBitmap - " + resId);
//        return decodeSampledBitmapFromResource(mResources, resId, mImageWidth,
//                mImageHeight, getImageCache());
//    }
//
//    @Override
//    protected Bitmap processBitmap(Object data) {
//        return processBitmap(Integer.parseInt(String.valueOf(data)));
//    }
//
//    /**
//     * Decode and sample down a bitmap from resources to the requested width and height.
//     *
//     * @param res The resources object containing the image data
//     * @param resId The resource id of the image data
//     * @param reqWidth The requested width of the resulting bitmap
//     * @param reqHeight The requested height of the resulting bitmap
//     * @param cache The ImageCache used to find candidate bitmaps for use with inBitmap
//     * @return A bitmap sampled down from the original with the same aspect ratio and dimensions
//     *         that are equal to or greater than the requested width and height
//     */
//    public static Bitmap decodeSampledBitmapFromResource(Resources res, int resId,
//            int reqWidth, int reqHeight, ImageCache cache) {
//
//        // BEGIN_INCLUDE (read_bitmap_dimensions)
//        // First decode with inJustDecodeBounds=true to check dimensions
//        final BitmapFactory.Options options = new BitmapFactory.Options();
//        options.inJustDecodeBounds = true;
//        BitmapFactory.decodeResource(res, resId, options);
//
//        // Calculate inSampleSize
//        options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight);
//        // END_INCLUDE (read_bitmap_dimensions)
//
//        // If we're running on Honeycomb or newer, try to use inBitmap
//        if (Utils.hasHoneycomb()) {
//            addInBitmapOptions(options, cache);
//        }
//
//        // Decode bitmap with inSampleSize set
//        options.inJustDecodeBounds = false;
//        return BitmapFactory.decodeResource(res, resId, options);
//    }
//
//    /**
//     * Decode and sample down a bitmap from a file to the requested width and height.
//     *
//     * @param filename The full path of the file to decode
//     * @param reqWidth The requested width of the resulting bitmap
//     * @param reqHeight The requested height of the resulting bitmap
//     * @param cache The ImageCache used to find candidate bitmaps for use with inBitmap
//     * @return A bitmap sampled down from the original with the same aspect ratio and dimensions
//     *         that are equal to or greater than the requested width and height
//     */
//    public static Bitmap decodeSampledBitmapFromFile(String filename,
//            int reqWidth, int reqHeight, ImageCache cache) {
//
//        // First decode with inJustDecodeBounds=true to check dimensions
//        final BitmapFactory.Options options = new BitmapFactory.Options();
//        options.inJustDecodeBounds = true;
//        BitmapFactory.decodeFile(filename, options);
//
//        // Calculate inSampleSize
//        options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight);
//
//        // If we're running on Honeycomb or newer, try to use inBitmap
//        if (Utils.hasHoneycomb()) {
//            addInBitmapOptions(options, cache);
//        }
//
//        // Decode bitmap with inSampleSize set
//        options.inJustDecodeBounds = false;
//        return BitmapFactory.decodeFile(filename, options);
//    }
//
//    /**
//     * Decode and sample down a bitmap from a file input stream to the requested width and height.
//     *
//     * @param fileDescriptor The file descriptor to read from
//     * @param reqWidth The requested width of the resulting bitmap
//     * @param reqHeight The requested height of the resulting bitmap
//     * @param cache The ImageCache used to find candidate bitmaps for use with inBitmap
//     * @return A bitmap sampled down from the original with the same aspect ratio and dimensions
//     *         that are equal to or greater than the requested width and height
//     */
//    public static Bitmap decodeSampledBitmapFromDescriptor(
//            FileDescriptor fileDescriptor, int reqWidth, int reqHeight, ImageCache cache) {
//
//        // First decode with inJustDecodeBounds=true to check dimensions
//        final BitmapFactory.Options options = new BitmapFactory.Options();
//        options.inJustDecodeBounds = true;
//        BitmapFactory.decodeFileDescriptor(fileDescriptor, null, options);
//
//        // Calculate inSampleSize
//        options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight);
//
//        // Decode bitmap with inSampleSize set
//        options.inJustDecodeBounds = false;
//
//        // If we're running on Honeycomb or newer, try to use inBitmap
//        if (Utils.hasHoneycomb()) {
//            addInBitmapOptions(options, cache);
//        }
//
//        return BitmapFactory.decodeFileDescriptor(fileDescriptor, null, options);
//    }
//
//    @TargetApi(Build.VERSION_CODES.HONEYCOMB)
//    private static void addInBitmapOptions(BitmapFactory.Options options, ImageCache cache) {
//        //BEGIN_INCLUDE(add_bitmap_options)
//        // inBitmap only works with mutable bitmaps so force the decoder to
//        // return mutable bitmaps.
//        options.inMutable = true;
//
//        if (cache != null) {
//            // Try and find a bitmap to use for inBitmap
//            Bitmap inBitmap = cache.getBitmapFromReusableSet(options);
//
//            if (inBitmap != null) {
//                options.inBitmap = inBitmap;
//            }
//        }
//        //END_INCLUDE(add_bitmap_options)
//    }
//
//    /**
//     * Calculate an inSampleSize for use in a {@link android.graphics.BitmapFactory.Options} object when decoding
//     * bitmaps using the decode* methods from {@link android.graphics.BitmapFactory}. This implementation calculates
//     * the closest inSampleSize that is a power of 2 and will result in the final decoded bitmap
//     * having a width and height equal to or larger than the requested width and height.
//     *
//     * @param options An options object with out* params already populated (run through a decode*
//     *            method with inJustDecodeBounds==true
//     * @param reqWidth The requested width of the resulting bitmap
//     * @param reqHeight The requested height of the resulting bitmap
//     * @return The value to be used for inSampleSize
//     */
//    public static int calculateInSampleSize(BitmapFactory.Options options,
//            int reqWidth, int reqHeight) {
//        // BEGIN_INCLUDE (calculate_sample_size)
//        // Raw height and width of image
//        final int height = options.outHeight;
//        final int width = options.outWidth;
//        int inSampleSize = 1;
//
//        if (height > reqHeight || width > reqWidth) {
//
//            final int halfHeight = height / 2;
//            final int halfWidth = width / 2;
//
//            // Calculate the largest inSampleSize value that is a power of 2 and keeps both
//            // height and width larger than the requested height and width.
//            while ((halfHeight / inSampleSize) > reqHeight
//                    && (halfWidth / inSampleSize) > reqWidth) {
//                inSampleSize *= 2;
//            }
//
//            // This offers some additional logic in case the image has a strange
//            // aspect ratio. For example, a panorama may have a much larger
//            // width than height. In these cases the total pixels might still
//            // end up being too large to fit comfortably in memory, so we should
//            // be more aggressive with sample down the image (=larger inSampleSize).
//
//            long totalPixels = width * height / inSampleSize;
//
//            // Anything more than 2x the requested pixels we'll sample down further
//            final long totalReqPixelsCap = reqWidth * reqHeight * 2;
//
//            while (totalPixels > totalReqPixelsCap) {
//                inSampleSize *= 2;
//                totalPixels /= 2;
//            }
//        }
//        return inSampleSize;
//        // END_INCLUDE (calculate_sample_size)
//    }
//}
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