Androidのいくつかの画像の特効処理の集錦

                ，      。  ，              ，              。         。
      。  C++    ，           C++。。。。






     //     
    public static Bitmap zoomImg(String img, int newWidth ,int newHeight){
    //    
        Bitmap bm = BitmapFactory.decodeFile(img);
        if(null!=bm){
            return zoomImg(bm,newWidth,newHeight);
        }
        return null;
    }
    
    public static Bitmap zoomImg(Context context,String img, int newWidth ,int newHeight){
        //    
        try {
            Bitmap bm = BitmapFactory.decodeStream(context.getAssets()
                    .open(img));
            if (null != bm) {
                return zoomImg(bm, newWidth, newHeight);
            }
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return null;
        }
     //     
    public static Bitmap zoomImg(Bitmap bm, int newWidth ,int newHeight){
        //        
        int width = bm.getWidth();
        int height = bm.getHeight();
        //       
        float scaleWidth = ((float) newWidth) / width;
        float scaleHeight = ((float) newHeight) / height;
        //        matrix  
        Matrix matrix = new Matrix();
        matrix.postScale(scaleWidth, scaleHeight);
        //       
        Bitmap newbm = Bitmap.createBitmap(bm, 0, 0, width, height, matrix, true);
        return newbm;
    }

 // Drawable   Bitmap
  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;
      
     }

//         
 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;
 }

//          
 public static Bitmap createReflectionImageWithOrigin(Bitmap bitmap){
  final int reflectionGap = 4;
  int width = bitmap.getWidth();
  int height = bitmap.getHeight();
  
  Matrix matrix = new Matrix();
  matrix.preScale(1, -1);
  
  Bitmap reflectionImage = Bitmap.createBitmap(bitmap,
    0, height/2, width, height/2, matrix, false);
  
  Bitmap bitmapWithReflection = Bitmap.createBitmap(width, (height + height/2), Config.ARGB_8888);
  
  Canvas canvas = new Canvas(bitmapWithReflection);
  canvas.drawBitmap(bitmap, 0, 0, null);
  Paint deafalutPaint = new Paint();
  canvas.drawRect(0, height,width,height + reflectionGap,
    deafalutPaint);
  
  canvas.drawBitmap(reflectionImage, 0, height + reflectionGap, null);
  
  Paint paint = new Paint();
  LinearGradient shader = new LinearGradient(0,
    bitmap.getHeight(), 0, bitmapWithReflection.getHeight()
    + reflectionGap, 0x70ffffff, 0x00ffffff, TileMode.CLAMP);
  paint.setShader(shader);
  // Set the Transfer mode to be porter duff and destination in
  paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN));
  // Draw a rectangle using the paint with our linear gradient
  canvas.drawRect(0, height, width, bitmapWithReflection.getHeight()
    + reflectionGap, paint);
 
  return bitmapWithReflection;
 }