Android Bitmap Scale scaleBitmapDown(Bitmap bitmap)

Description

Scale down the bitmap in order to make color analysis faster.

License

Apache License

Declaration

private static Bitmap scaleBitmapDown(Bitmap bitmap) 

Method Source Code

//package com.java2s;
/*/*from w  w w . ja v a  2  s  .com*/
 * Copyright (C) 2014 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;

public class Main {
    /**
     * Scale down the bitmap in order to make color analysis faster. Taken from Palette.
     */
    private static Bitmap scaleBitmapDown(Bitmap bitmap) {
        final int CALCULATE_BITMAP_MIN_DIMENSION = 100;
        final int minDimension = Math.min(bitmap.getWidth(),
                bitmap.getHeight());

        if (minDimension <= CALCULATE_BITMAP_MIN_DIMENSION) {
            // If the bitmap is small enough already, just return it
            return bitmap;
        }

        final float scaleRatio = CALCULATE_BITMAP_MIN_DIMENSION
                / (float) minDimension;
        return Bitmap.createScaledBitmap(bitmap,
                Math.round(bitmap.getWidth() * scaleRatio),
                Math.round(bitmap.getHeight() * scaleRatio), false);
    }
}

Related

1. scaleBitmap(String path, int newWidth, int newHeight)
2. scaleClipBitmapByCircle(Bitmap src, int nRadius, float fStrokeWidth)
3. getScaledImageFromUri(Activity activity, Uri uri, int size)
4. imageScale(Bitmap bitmap, int dst_w, int dst_h)
5. scaleBitmap(Bitmap bitmap, float scale)
6. scaleToFit(Bitmap bm, float width_Ratio, float height_Ratio)
7. stretchImage(Bitmap image, float xscale, float yscale)
8. stretchImage(Bitmap image, int xsize, int ysize)
9. zoomImg(Bitmap bm, int newWidth, int newHeight)