imageutil.java

基于j2me的图片特效（缩放

ImageUtil



/*
 * ImageUtil.java
 *
 * Created on 2008年1月11日, 上午9:26
 *
 */


/**
 *
 * @author alajl
 */


import javax.microedition.lcdui.*;
import javax.microedition.lcdui.game.Sprite;


public class ImageUtil
{
    public static final int TURN_LEFT = 1;
    public static final int TURN_RIGHT = 2;


    /*
    *获取图片RGB数据，并返回大小为width*height大小的一维数组
    */
    public int[] getPixels(Image src)
    {
        int w = src.getWidth();
        int h = src.getHeight();
        int[] pixels = new int[w * h];
        src.getRGB(pixels, 0, w, 0, 0, w, h);
        return pixels;
    }

 
    /*
    *将pixels[]里的数据，生成一张图片，图片宽为w，高为h
    */ 
    public Image drawPixels(int[] pixels, int w, int h)
    {
        Image image = Image.createRGBImage(pixels, w, h, true);
        pixels = null;
        return image;
    }


    /*
    *调整图片大小
    *destW 调整后的宽，destH调整后的高
    */  
    public  Image effect_resizeImage(Image src, int destW, int destH)
    {
        int srcW = src.getWidth();
        int srcH = src.getHeight();

  
        int[] destPixels = new int[destW * destH]; 
        
        int[] srcPixels = getPixels(src); 

            for (int destY = 0; destY < destH; ++destY)
            {
                for (int destX = 0; destX < destW; ++destX)
                {
                    int srcX = (destX * srcW) / destW;
                    int srcY = (destY * srcH) / destH;
                    destPixels[destX + destY * destW] = srcPixels[srcX + srcY
                            * srcW];
                }
            }

  
        return drawPixels(destPixels, destW, destH);
    }

   
   /*
   * 调整图片亮度与对比度。  contrast 对比度，light 亮度
   */
   public Image effect_light_contrast(Image src,double contrast,int light)
   {
            int srcW = src.getWidth();
            int srcH = src.getHeight();  
            int[] srcPixels = getPixels(src);
            int r = 0;
            int g = 0;
            int b = 0;
            int a = 0;
            int argb;
     //公式y =ax+b   a为对比度，b为亮度 
     //int para_b  = light - 127 * (light - 1);
     for (int i = 0; i < srcH; i++)
           {
              for(int ii=0;ii<srcW;ii++)
        {
                      argb = srcPixels[i*srcW+ii];  
        a = ((argb & 0xff000000) >> 24); // alpha channel
                      r =((argb & 0x00ff0000) >> 16); // red channel
                      g =((argb & 0x0000ff00) >> 8); // green channel
                      b =(argb & 0x000000ff); // blue channel
                      r =(int)( r*contrast+light);                     
        g =(int)( g*contrast+light);
        b =(int)( b*contrast+light);
                     
         /*r =(int)((r -127 ) * contrast + 127+para_b);
         g =(int)((g -127 ) * contrast + 127+para_b);
         b =(int)((b -127 ) * contrast + 127+para_b);*/
         if(r>255)
                               r = 255;
                       else if(r<0) r=0;
                       if(g>255)
                               g = 255;
                       else if(g<0) g=0;
                       if(b>255)
                               b = 255;
                       else if(b<0) b=0;
               srcPixels[i*srcW+ii] = ((a << 24) | (r << 16) | (g << 8) | b);

        }
     }
         return drawPixels(srcPixels, srcW, srcH);
   }
 
 
    /*
   * 图片镜像特效
   */
    public Image effect_mirror(Image src)
    {
          int srcW = src.getWidth();
          int srcH = src.getHeight();  
          int[] srcPixels = getPixels(src);
          int len;
          int temp;
          for (int i = 0; i < srcH; i++)
          {
              len = (i+1)*srcW;
              for(int ii=0;ii<srcW/2;ii++) 
              {   
                 temp=srcPixels[i*srcW+ii]; 
                 srcPixels[i*srcW+ii]=srcPixels[len-1-ii]; 
                 srcPixels[len-1-ii]=temp; 
              } 
           }
           return drawPixels(srcPixels, srcW, srcH);
    }

      /*
   * 图片剪切，cut_xpos，cut_ypos 切割框的起始位置坐标，cut_width，cut_height 切割框的宽与高
   */
    public Image effect_cut(Image src,int cut_xpos,int cut_ypos,int cut_width,int cut_height)
    {
          int srcW = src.getWidth();
          int srcH = src.getHeight();  
          int[] srcPixels = getPixels(src);
          int[] desPixels = new int[cut_width*cut_height];
          int argb;
   int num = 0;
          for (int i = 0; i < srcH; i++)
          {
            if(i >= cut_ypos&&i<cut_height+cut_ypos)
            {
                 for(int ii=0;ii<srcW;ii++)
          {
                    if(ii>=cut_xpos && ii<cut_width+cut_xpos)
      {
                         desPixels[num] = srcPixels[i*srcW+ii];    
                         num++;
                         
        }
   }
             }
         }
           return drawPixels(desPixels, cut_width, cut_height);
    }


    /*
   * 图片叠加，将src和image合成一张图片，x_pos，y_pos一般为0,0,也可以为自定义值
   */
    public Image effect_image_add_image(Image src,Image image,int x_pos,int y_pos)
    {   
             Image temp  = Image.createImage(src.getWidth(),src.getHeight());
      Graphics g = temp.getGraphics();
             //g.drawImage(src,x_pos,y_pos,Graphics.LEFT|Graphics.TOP);
      //g.drawImage(image,x_pos,y_pos,Graphics.LEFT|Graphics.TOP);*/ 
             int alpha = 168;
             int []srcRgbdata   =   new   int[src.getWidth()*src.getHeight()];   
             int []desRgbdata   =   new   int[image.getWidth()*image.getHeight()];  
             src.getRGB(srcRgbdata,0,src.getWidth(),0,0,src.getWidth(),src.getHeight());   
             image.getRGB(desRgbdata,0,image.getWidth(),0,0,image.getWidth(),image.getHeight());    
             g.drawRGB(getTransImg(alpha,srcRgbdata,desRgbdata),0,src.getWidth(),0,0,src.getWidth(),src.getHeight(),false);   
             src=null;   
             image=null;  
             return temp;
    }
    
     /*
   * 图片上添加字符
   */
    public Image effect_image_add_str(Image src,String str,int x_pos,int y_pos)
    { 
             Image temp = Image.createImage(src.getWidth(),src.getHeight());
      Graphics g = temp.getGraphics();
             g.drawImage(src,0,0,Graphics.LEFT|Graphics.TOP);
             g.setColor(0x000000);
   g.drawString(str,x_pos,y_pos,Graphics.LEFT|Graphics.TOP);
             return temp;
    }
 
     /*
   * 图片特效负片
   */
    public Image effect_negative(Image src)
    {
         int srcW = src.getWidth();
         int srcH = src.getHeight();  
         int[] srcPixels = getPixels(src);
         int r = 0;
         int g = 0;
         int b = 0;
         int a = 0;
         int argb;   
         for (int i = 0; i < srcH; i++)
         {
              for(int ii=0;ii<srcW;ii++)
        {
   argb = srcPixels[i*srcW+ii];
                        a = ((argb & 0xff000000) >> 24); // alpha channel
                        r =255-((argb & 0x00ff0000) >> 16); // red channel
                        g =255-((argb & 0x0000ff00) >> 8); // green channel
                        b =255-(argb & 0x000000ff); // blue channel
                        srcPixels[i*srcW+ii] = ((a << 24) | (r << 16) | (g << 8) | b);
        }
         }
        return drawPixels(srcPixels, srcW, srcH);

         
    }

      /*
   * 图片特效黑白
   */
     public Image effect_black_white(Image src)
    {
         int srcW = src.getWidth();
         int srcH = src.getHeight();  
         int[] srcPixels = getPixels(src);
         int r = 0;
         int g = 0;
         int b = 0;
         int a = 0;