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package in.srain.cube.image.impl; // ww w .j a va 2 s .c o m import android.graphics.BitmapFactory; import in.srain.cube.image.ImageTask; import in.srain.cube.image.iface.ImageResizer; /** * A default implementation of {@link ImageResizer} * * @author http://www.liaohuqiu.net */ public class DefaultImageResizer implements ImageResizer { private static DefaultImageResizer sInstance; public static DefaultImageResizer getInstance() { if (sInstance == null) { sInstance = new DefaultImageResizer(); } return sInstance; } @Override public int getInSampleSize(ImageTask imageTask) { int size = calculateInSampleSize(imageTask.getBitmapOriginSize().x, imageTask.getBitmapOriginSize().y, imageTask.getRequestSize().x, imageTask.getRequestSize().y); return size; } @Override public String getRemoteUrl(ImageTask imageTask) { return imageTask.getRemoteUrl(); } /** * Calculate an inSampleSize for use in a {@link BitmapFactory.Options} object when decoding bitmaps using the decode* methods from {@link BitmapFactory}. * <p/> * This implementation calculates the closest inSampleSize that is a times 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. */ public static int calculateInSampleSize(int originWidth, int originHeight, int reqWidth, int reqHeight) { int inSampleSize = 1; if (reqHeight <= 0 || reqHeight <= 0 || reqHeight == Integer.MAX_VALUE || reqWidth == Integer.MAX_VALUE) { return inSampleSize; } if (originWidth > reqHeight || originHeight > reqWidth) { final int halfHeight = originWidth / 2; final int halfWidth = originHeight / 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; } } return inSampleSize; } }