借点代码 二维码 2

import java.awt.Graphics2D; 

import java.awt.geom.AffineTransform; 

import java.awt.image.BufferedImage; 

   

import com.google.zxing.LuminanceSource; 

   

public class BufferedImageLuminanceSource  extends LuminanceSource { 

     private final BufferedImage image; 

     private final int left; 

     private final int top; 

   

     public BufferedImageLuminanceSource(BufferedImage image) { 

         this (image,  0 ,  0 , image.getWidth(), image.getHeight()); 

     } 

   

     public BufferedImageLuminanceSource(BufferedImage image,  int left, 

             int top,  int width,  int height) { 

         super (width, height); 

   

         int sourceWidth = image.getWidth(); 

         int sourceHeight = image.getHeight(); 

         if (left + width > sourceWidth || top + height > sourceHeight) { 

             throw new IllegalArgumentException( 

                     "Crop rectangle does not fit within image data." ); 

         } 

   

         for ( int y = top; y < top + height; y++) { 

             for ( int x = left; x < left + width; x++) { 

                 if ((image.getRGB(x, y) &  0xFF000000 ) ==  0 ) { 

                     image.setRGB(x, y,  0xFFFFFFFF );  // = white 

                 } 

             } 

         } 

   

         this .image =  new BufferedImage(sourceWidth, sourceHeight, 

                 BufferedImage.TYPE_BYTE_GRAY); 

         this .image.getGraphics().drawImage(image,  0 ,  0 ,  null ); 

         this .left = left; 

         this .top = top; 

     } 

   

       

     public byte [] getRow( int y,  byte [] row) { 

         if (y <  0 || y >= getHeight()) { 

             throw new IllegalArgumentException( 

                     "Requested row is outside the image: " + y); 

         } 

         int width = getWidth(); 

         if (row ==  null || row.length < width) { 

             row =  new byte [width]; 

         } 

         image.getRaster().getDataElements(left, top + y, width,  1 , row); 

         return row; 

     } 

   

       

     public byte [] getMatrix() { 

         int width = getWidth(); 

         int height = getHeight(); 

         int area = width * height; 

         byte [] matrix =  new byte [area]; 

         image.getRaster().getDataElements(left, top, width, height, matrix); 

         return matrix; 

     } 

   

       

     public boolean isCropSupported() { 

         return true ; 

     } 

   

       

     public LuminanceSource crop( int left,  int top,  int width,  int height) { 

         return new BufferedImageLuminanceSource(image,  this .left + left, 

                 this .top + top, width, height); 

     } 

   

       

     public boolean isRotateSupported() { 

         return true ; 

     } 

   

       

     public LuminanceSource rotateCounterClockwise() { 

         int sourceWidth = image.getWidth(); 

         int sourceHeight = image.getHeight(); 

         AffineTransform transform =  new AffineTransform( 0.0 , - 1.0 ,  1.0 , 

                 0.0 ,  0.0 , sourceWidth); 

         BufferedImage rotatedImage =  new BufferedImage(sourceHeight, 

                 sourceWidth, BufferedImage.TYPE_BYTE_GRAY); 

         Graphics2D g = rotatedImage.createGraphics(); 

         g.drawImage(image, transform,  null ); 

         g.dispose(); 

         int width = getWidth(); 

         return new BufferedImageLuminanceSource(rotatedImage, top, 

                 sourceWidth - (left + width), getHeight(), width); 

     } 

}

转载于:https://my.oschina.net/u/2504076/blog/550672