ImageUtil.java

package com.zzx.factorytest.utils;

import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.PixelFormat;
import android.graphics.PorterDuff.Mode;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.graphics.RectF;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;

public class ImageUtil {

	// �Ŵ���СDrawable
	@SuppressWarnings("unused")
	public static Drawable zoomDrawable(Drawable drawable, int w, int h) {
		int width = drawable.getIntrinsicWidth();
		int height = drawable.getIntrinsicHeight();
		Bitmap oldbmp = drawableToBitmap(drawable);
		Matrix matrix = new Matrix();
		float scaleWidth = ((float) w / width);
		float scaleHeight = ((float) h / height);
		matrix.postScale(scaleWidth, scaleHeight);
		Bitmap newbmp = Bitmap.createBitmap(oldbmp, 0, 0, width, height,
				matrix, true);
		return new BitmapDrawable(null, newbmp);
	}

	// �Ŵ���СͼƬ
	public static Bitmap zoomBitmap(Bitmap bitmap, int w, int h) {
		int width = bitmap.getWidth();
		int height = bitmap.getHeight();
		Matrix matrix = new Matrix();
		float scaleWidht = ((float) w / width);
		float scaleHeight = ((float) h / height);
		matrix.postScale(scaleWidht, scaleHeight);
		Bitmap newbmp = Bitmap.createBitmap(bitmap, 0, 0, width, height,
				matrix, true);
		return newbmp;
	}

	// ��Drawableת��ΪBitmap
	public static Bitmap drawableToBitmap(Drawable drawable) {
		int width = drawable.getIntrinsicWidth();
		int height = drawable.getIntrinsicHeight();
		Bitmap bitmap = Bitmap.createBitmap(width, height, drawable
				.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888
				: Bitmap.Config.RGB_565);

		Canvas canvas = new Canvas(bitmap);
		drawable.setBounds(0, 0, width, height);
		drawable.draw(canvas);
		return bitmap;

	}

	// ��Drawableת��ΪBitmap
	public static Bitmap drawableToBitmap(Drawable drawable, Config config) {
		int width = drawable.getIntrinsicWidth();
		int height = drawable.getIntrinsicHeight();
		Bitmap bitmap = Bitmap.createBitmap(width, height, config);

		Canvas canvas = new Canvas(bitmap);
		drawable.setBounds(0, 0, width, height);
		drawable.draw(canvas);
		return bitmap;

	}

	// ���Բ��ͼƬ�ķ���
	public static Bitmap getRoundedCornerBitmap(Bitmap bitmap, float roundPx) {

		Bitmap output = Bitmap.createBitmap(bitmap.getWidth(),
				bitmap.getHeight(), Config.ARGB_8888);
		Canvas canvas = new Canvas(output);

		final int color = 0xff424242;
		final Paint paint = new Paint();
		final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
		final RectF rectF = new RectF(rect);

		paint.setAntiAlias(true);
		canvas.drawARGB(0, 0, 0, 0);
		paint.setColor(color);
		canvas.drawRoundRect(rectF, roundPx, roundPx, paint);

		paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
		canvas.drawBitmap(bitmap, rect, rect, paint);

		return output;
	}

	/**
	 * ��ȡԲ��ͼ��
	 */
	public static Bitmap getRoundedCornerBitmap(Bitmap bitmap) {
		if (bitmap == null)
			return null;
		Bitmap output = Bitmap.createBitmap(bitmap.getWidth(),
				bitmap.getHeight(), Config.RGB_565);
		Canvas canvas = new Canvas(output);

		final int color = 0xff424242;
		final Paint paint = new Paint();
		final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
		final RectF rectF = new RectF(rect);
		final float roundPx = 5;

		paint.setAntiAlias(true);
		canvas.drawARGB(0, 0, 0, 0);
		paint.setColor(color);
		canvas.drawRoundRect(rectF, roundPx, roundPx, paint);
		paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
		canvas.drawBitmap(bitmap, rect, rect, paint);
		return output;
	}

	/**
	 * ͼƬ�ϳ�
	 * 
	 * @param bitmap
	 * @return
	 */
	public static Bitmap createBitmap(Bitmap src, Bitmap watermark) {
		if (src == null) {
			return null;
		}
		int w = src.getWidth();
		int h = src.getHeight();
		int ww = watermark.getWidth();
		int wh = watermark.getHeight();
		// create the new blank bitmap
		Bitmap newb = Bitmap.createBitmap(w, h, Config.ARGB_8888);// ����һ���µĺ�SRC���ȿ��һ����λͼ
		Canvas cv = new Canvas(newb);
		// draw src into
		cv.drawBitmap(src, 0, 0, null);// �� 0��0���꿪ʼ����src
		// draw watermark into
		cv.drawBitmap(watermark, w - ww, h - wh, null);// ��src�����½ǻ���ˮӡ
		// save all clip
		cv.save(Canvas.ALL_SAVE_FLAG);// ����
		// store
		cv.restore();// �洢
		return newb;
	}

}