對黑莓中的位圖應用浮雕和素描效果

Question

我有一個黑莓項目，我希望將普通圖像更改爲浮雕效果和草圖效果。 我試過了一個代碼，但它給了我空指針異常...我使用了一個卷積矩陣類，並且使用了它的方法。 任何人都可以幫助我嗎？

public class ToEmboss { 

    public static Bitmap emboss(Bitmap src) { 
     double[][] EmbossConfig = new double[][] { 
      { -1 , 0, -1 }, 
      { 0 , 4, 0 }, 
      { -1 , 0, -1 } 
     }; 
     ConvolutionMatrix convMatrix = new ConvolutionMatrix(3); 
     convMatrix.applyConfig(EmbossConfig); 
     convMatrix.Factor = 1; 
     convMatrix.Offset = 127; 
     return ConvolutionMatrix.computeConvolution3x3(src, convMatrix); 
    } 
} 


package mypackage; 
import net.rim.device.api.system.Bitmap; 

public class ConvolutionMatrix { 

    public static final int SIZE = 3; 
    public static int[][] pixel; 
    public double[][] Matrix; 
    public double Factor = 1; 
    public double Offset = 1; 

    public ConvolutionMatrix(int size) { 
     Matrix = new double[size][size]; 
    } 

    public void setAll(double value) { 
     for (int x = 0; x < SIZE; ++x) { 
      for (int y = 0; y < SIZE; ++y) { 
       Matrix[x][y] = value; 
      } }} 

    public void applyConfig(double[][] config) { 
     for(int x = 0; x < SIZE; ++x) { 
      for(int y = 0; y < SIZE; ++y) { 
       Matrix[x][y] = config[x][y]; 
      }}} 

    public static Bitmap computeConvolution3x3(Bitmap src, ConvolutionMatrix matrix) { 
    int width = src.getWidth(); 
    int height = src.getHeight(); 
    int A, R, G, B; 
    int sumR, sumG, sumB; 
    int[][] pixels = new int[SIZE][SIZE]; 

    int [][] newargb=new int[width][height]; 

    int[] argb=new int[width*height]; 

    int a=0; 
    src.getARGB(argb, 0, width, 0, 0, width, height); 
    for(a=0;a<argb.length-1;a++) 
    { 
     A= argb[a] >> 24; 
     R= argb[a] >> 16 & 0xFF; 
     G= argb[a] >> 8 & 0xFF; 
     B= argb[a] & 0xFF; 
    } 

    for(int i = 0; i <= height; ++i) { 
     for(int j = 0; j <= width; ++j) { 
      newargb[i][j]=argb[a]; 
      a++; 
     } 
    } 

    for(int y = 0; y <= height; ++y) { 
     for(int x = 0; x <= width; ++x) { 
      // get pixel matrix 
      for(int i = 0; i < SIZE; ++i) { 
       for(int j = 0; j < SIZE; ++j) { 
        pixels[i][j] = newargb[x + i][ y + j]; 
       } 
      } 

      // get alpha of center pixel 

      A = pixels[1][1]>>24; 
      // init color sum 
      sumR = sumG = sumB = 0; 

      // get sum of RGB on matrix 
      for(int i = 0; i < SIZE; ++i) { 
       for(int j = 0; j < SIZE; ++j) { 

        A=pixels[i][j]>>24; 
        R=pixels[i][j]>>16 ; 
        G=pixels[i][j]>>8 ; 
        B=pixels[i][j] ; 

        sumR += (R * matrix.Matrix[i][j]); 
        sumG += (G * matrix.Matrix[i][j]); 
        sumB += (B * matrix.Matrix[i][j]); 
       } 
      } 

      // get final Red 
      R = (int)(sumR/matrix.Factor + matrix.Offset); 
      if(R < 0) { R = 0; } 
      else if(R > 255) { R = 255; } 

      // get final Green 
      G = (int)(sumG/matrix.Factor + matrix.Offset); 
      if(G < 0) { G = 0; } 
      else if(G > 255) { G = 255; } 

      // get final Blue 
      B = (int)(sumB/matrix.Factor + matrix.Offset); 
      if(B < 0) { B = 0; } 
      else if(B > 255) { B = 255; } 

      // apply new pixel 
      //result.setPixel(x + 1, y + 1, Color.argb(A, R, G, B)); 

      argb[x*width+y] = ((argb[x*width+y] & 0xff000000) | R<< 16 | G << 8 | B); 
     } 
    } 
    src.setARGB(argb, 0, width, 0, 0, width, height); 
    return src; 
} 
} 

Answer 1

我看到public static int[][] pixel;和computeConvolution3x3，有陣列的讀，但它看起來並不像它曾經分配什麼，所以pixel永遠是零，這意味着第一次嘗試從數組中讀取會拋出一個NullPointerException