ImageData

package com.justenjoy.util;

import android.graphics.Bitmap;

/**
 * Created by 王洪贺 on 15/8/5.
 */
public class ImageData {
	private Bitmap mBitmap;
	private int[] pixels;
	public int width;
	public int height;
	private int alpha = (0xFF << 24);

	public ImageData(Bitmap bitmap) {
		this.mBitmap = bitmap;
		this.width = mBitmap.getWidth(); // 获取位图的宽
		this.height = mBitmap.getHeight(); // 获取位图的高
		this.pixels = new int[width * height];// 通过位图的大小创建像素点数组
		mBitmap.getPixels(pixels, 0, width, 0, 0, width, height); // 根据宽高获取像素
	}

	/**
	 * 获取某一个像素的R值
	 * 
	 * @param widthPx
	 * @param heightPx
	 * @return
	 */
	public int getRComponent(int widthPx, int heightPx) {
		return (getRGB(widthPx, heightPx) & 0x00FF0000) >> 16;
	}

	/**
	 * 获取某一个像素G的值
	 * 
	 * @param widthPx
	 * @param heightPx
	 * @return
	 */
	public int getGComponent(int widthPx, int heightPx) {
		return (getRGB(widthPx, heightPx) & 0x0000FF00) >> 8;
	}

	/**
	 * 获取某一个像素B的值
	 * 
	 * @param widthPx
	 * @param heightPx
	 * @return
	 */
	public int getBComponent(int widthPx, int heightPx) {
		return (getRGB(widthPx, heightPx) & 0x000000FF);
	}

	public int getRGB(int widthPx, int heightPx) {
		return pixels[width * heightPx + widthPx];
	}

	/**
	 * 设置某一个像素的颜色
	 * 
	 * @param widthPx
	 * @param heightPx
	 * @param R
	 * @param G
	 * @param B
	 */
	public void setPixelColor(int widthPx, int heightPx, int R, int G, int B) {
		pixels[width * heightPx + widthPx] = alpha | R << 16 | G << 8 | B;
	}

	/**
	 * 获取改变后的bitmap图像
	 * 
	 * @return
	 */
	public Bitmap getBitmap() {
		Bitmap bitmap = Bitmap.createBitmap(width, height,
				Bitmap.Config.ARGB_8888);
		bitmap.setPixels(pixels, 0, width, 0, 0, width, height);
		mBitmap.recycle();
		return bitmap;
	}
}