图像处理之图像纹理添加效果(利用JAVA 2D纹理画笔)

package com.gloomyfish.filter.study;
 
import java.awt.Graphics2D;
import java.awt.Rectangle;
import java.awt.TexturePaint;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;
 
public class TextureAdditionFilter extends AbstractBufferedImageOp {
 
  private BufferedImage textureImage;
  private float textureTransparency;
  
  public TextureAdditionFilter()
  {
    textureTransparency = 0.9f;
    System.out.println("Java texture Image Addition Filter");
  }
  
  public void setTextureImage(BufferedImage textureImage) {
    this.textureImage = textureImage;
  }
 
  public void setTextureTransparency(float textureTransparency) {
    this.textureTransparency = textureTransparency;
  }
 
  @Override
  public BufferedImage filter(BufferedImage src, BufferedImage dest) {
    if(textureImage != null) {
      int width = textureImage.getWidth();
          int height = textureImage.getHeight();
          BufferedImage grayTextureImage = null;
          grayTextureImage = new BufferedImage(width, height, BufferedImage.TYPE_4BYTE_ABGR);
          int[] inPixels = new int[width*height];
          int[] outPixels = new int[width*height];
          getRGB( textureImage, 0, 0, width, height, inPixels );
          int index = 0;
          for(int row=0; row<height; row++) {
            int ta = 0, tr = 0, tg = 0, tb = 0;
            for(int col=0; col<width; col++) {
              index = row * width + col;
              ta = (inPixels[index] >> 24) & 0xff;
                  tr = (inPixels[index] >> 16) & 0xff;
                  tg = (inPixels[index] >> 8) & 0xff;
                  tb = inPixels[index] & 0xff;
                  tr = tg = tb = (int)(0.299 * (double)tr + 0.587 * (double)tg + 0.114 * (double)tb);
                  ta = (int)(textureTransparency * tr);
                  outPixels[index] = (ta << 24) | (tr << 16) | (tg << 8) | tb;
                  
            }
          }
          
          // then call java 2D API to print texture image on target image
          // you can see magic result image if you adjust the parameter-textureTransparency
          // just play with it......
          setRGB( grayTextureImage, 0, 0, width, height, outPixels );
          Rectangle2D rectangle = new Rectangle(0, 0, width, height);
          TexturePaint tp = new TexturePaint(grayTextureImage, rectangle);
          Graphics2D g2d = src.createGraphics();
          g2d.setPaint(tp);
          width = src.getWidth();
          height = src.getHeight();
          g2d.fillRect(0, 0, width, height);
    }
    
    return src;
  }
 
}