Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
//License from project: Open Source License 

import android.graphics.Bitmap;

import android.graphics.Canvas;
import android.graphics.Paint;

import android.graphics.Rect;

import android.graphics.drawable.Drawable;

public class Main {
    public static Bitmap cropMaxVisibleBitmap(Drawable drawable, int iconSize) {
        Bitmap tmp = Bitmap.createBitmap(drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight(),
                Bitmap.Config.ARGB_8888);
        Canvas canvas = new Canvas(tmp);
        drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());
        drawable.draw(canvas);

        Rect crop = new Rect(tmp.getWidth(), tmp.getHeight(), -1, -1);
        for (int y = 0; y < tmp.getHeight(); y++) {
            for (int x = 0; x < tmp.getWidth(); x++) {
                int alpha = (tmp.getPixel(x, y) >> 24) & 255;
                if (alpha > 0) { // pixel is not 100% transparent
                    if (x < crop.left)
                        crop.left = x;
                    if (x > crop.right)
                        crop.right = x;
                    if (y < crop.top)
                        crop.top = y;
                    if (y > crop.bottom)
                        crop.bottom = y;
                }
            }
        }

        if (crop.width() <= 0 || crop.height() <= 0) {
            return Bitmap.createScaledBitmap(tmp, iconSize, iconSize, true);
        }

        // We want to crop a square region.
        float size = Math.max(crop.width(), crop.height());
        float xShift = (size - crop.width()) * 0.5f;
        crop.left -= Math.floor(xShift);
        crop.right += Math.ceil(xShift);

        float yShift = (size - crop.height()) * 0.5f;
        crop.top -= Math.floor(yShift);
        crop.bottom += Math.ceil(yShift);

        Bitmap finalImage = Bitmap.createBitmap(iconSize, iconSize, Bitmap.Config.ARGB_8888);
        canvas.setBitmap(finalImage);
        float scale = iconSize / size;

        canvas.scale(scale, scale);
        canvas.drawBitmap(tmp, -crop.left, -crop.top, new Paint(Paint.ANTI_ALIAS_FLAG | Paint.FILTER_BITMAP_FLAG));
        canvas.setBitmap(null);
        return finalImage;
    }
}