Decode an image into a Bitmap, using sub-sampling if the hinted dimensions call for it. - Android Graphics

Android examples for Graphics:Bitmap File

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Description

Decode an image into a Bitmap, using sub-sampling if the hinted dimensions call for it.

Demo Code

/*/*from w  ww  .ja  v a2 s  . c o  m*/
 * 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.
 */
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Matrix;
import com.android.mail.utils.LogUtils;

public class Main{
    /**
     * Decode an image into a Bitmap, using sub-sampling if the hinted dimensions call for it.
     * Does not crop to fit the hinted dimensions.
     *
     * @param src an encoded image
     * @param w hint width in px
     * @param h hint height in px
     * @return a decoded Bitmap that is not exactly sized to the hinted dimensions.
     */
    public static Bitmap decodeByteArray(byte[] src, int w, int h) {
        try {
            // calculate sample size based on w/h
            final BitmapFactory.Options opts = new BitmapFactory.Options();
            opts.inJustDecodeBounds = true;
            BitmapFactory.decodeByteArray(src, 0, src.length, opts);
            if (opts.mCancel || opts.outWidth == -1 || opts.outHeight == -1) {
                return null;
            }
            opts.inSampleSize = Math.min(opts.outWidth / w, opts.outHeight
                    / h);
            opts.inJustDecodeBounds = false;
            return BitmapFactory.decodeByteArray(src, 0, src.length, opts);
        } catch (Throwable t) {
            LogUtils.w(PhotoManager.TAG, t, "unable to decode image");
            return null;
        }
    }
}

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