Android Bitmap Size Get calculateInSampleSize(BitmapFactory.Options options, int reqWidth, int reqHeight)

Description

calculate In Sample Size

Declaration

public static int calculateInSampleSize(BitmapFactory.Options options,
            int reqWidth, int reqHeight) 

Method Source Code

//package com.java2s;

import android.graphics.BitmapFactory;

public class Main {
    public static int calculateInSampleSize(BitmapFactory.Options options,
            int reqWidth, int reqHeight) {
        // Raw height and width of image
        final int height = options.outHeight;
        final int width = options.outWidth;
        int inSampleSize = 1;

        if (height > reqHeight || width > reqWidth) {

            // Calculate ratios of height and width to requested height and width
            final int heightRatio = Math.round((float) height
                    / (float) reqHeight);
            final int widthRatio = Math.round((float) width
                    / (float) reqWidth);

            // Choose the smallest ratio as inSampleSize value, this will guarantee a final image
            // with both dimensions larger than or equal to the requested height and width.
            inSampleSize = heightRatio < widthRatio ? heightRatio
                    : widthRatio;//  w ww  . j  a v a 2 s.c om

            // 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).

            final float totalPixels = width * height;

            // Anything more than 2x the requested pixels we'll sample down further
            final float totalReqPixelsCap = reqWidth * reqHeight * 2;

            while (totalPixels / (inSampleSize * inSampleSize) > totalReqPixelsCap) {
                inSampleSize++;
            }
        }
        return inSampleSize;
    }
}

Related

1. computeSampleSize(BitmapFactory.Options options, int minSideLength, int maxNumOfPixels)
2. computeSampleSizeLarger(int w, int h, int minSideLength)
3. computeSampleSizeLarger(float scale)
4. getBitmapSize(Bitmap bitmap)
5. calculateInSampleSize(BitmapFactory.Options options, int reqWidth, int reqHeight)
6. computeInitialSampleSize( BitmapFactory.Options options, int minSideLength, int maxNumOfPixels)
7. computeSampleSize(BitmapFactory.Options options, int minSideLength, int maxNumOfPixels)
8. getBitmapSize(Bitmap bitmap)
9. getBitmapSize(String strImagePath)