ImageUtil.java

package me.ccrama.redditslide.util;

import android.graphics.Bitmap;

/**
 * Created by adrian on 8/24/16.
 */
public class ImageUtil {
    /* TODO: Implement tolerance */
    public static void drawWithTargetColor(Bitmap bm, Bitmap src, int targetcolor, int tolerance) {
        /*int r = (targetcolor >> 16) & 0xFF;
        int g = (targetcolor >>  8) & 0xFF;
        int b = (targetcolor >>  0) & 0xFF;*/

        int width = Math.max(bm.getWidth(), src.getWidth());
        int height = Math.max(bm.getHeight(), src.getHeight());

        int[] bmpixels = new int[width*height];
        bm.getPixels(bmpixels, 0, bm.getWidth(), 0, 0, width, height);

        int[] srcpixels = new int[width*height];
        src.getPixels(srcpixels, 0, src.getWidth(), 0, 0, width, height);

        for (int x = 0; x < width; x++) {
            for (int y = 0; y < height; y++) {
                if (bmpixels[x+width*y] == targetcolor) {
                    bmpixels[x+width*y] = srcpixels[x+width*y];
                }
            }
        }
        bm.setPixels(bmpixels, 0, bm.getWidth(), 0, 0, width, height);
    }
}