Bitmapの操作

ネット上のオープンソースのライブラリから整理されました.
1.切り取り

 
  
    /**
     *     
     *
     * @param src        
     * @param x           x
     * @param y           y
     * @param width       
     * @param height      
     * @param recycle     
     * @return       
     */
    public static Bitmap clip(Bitmap src, int x, int y, int width, int height, boolean recycle) {
        if (isEmptyBitmap(src)) return null;
        Bitmap ret = Bitmap.createBitmap(src, x, y, width, height);
        if (recycle && !src.isRecycled()) src.recycle();
        return ret;
    }
  
2.拡大・縮小
    /**
     *     
     *
     * @param src            
     * @param scaleWidth        
     * @param scaleHeight       
     * @param recycle         
     * @return       
     */
    public static Bitmap scale(Bitmap src, float scaleWidth, float scaleHeight, boolean recycle) {
        if (isEmptyBitmap(src)) return null;
        Matrix matrix = new Matrix();
        matrix.setScale(scaleWidth, scaleHeight);
        Bitmap ret = Bitmap.createBitmap(src, 0, 0, src.getWidth(), src.getHeight(), matrix, true);
        if (recycle && !src.isRecycled()) src.recycle();
        return ret;
    }
  
3、傾斜
    /**
     *     
     *
     * @param src        
     * @param kx          x
     * @param ky          y
     * @param px          x
     * @param py          y
     * @param recycle     
     * @return       
     */
    public static Bitmap skew(Bitmap src, float kx, float ky, float px, float py, boolean recycle) {
        if (isEmptyBitmap(src)) return null;
        Matrix matrix = new Matrix();
        matrix.setSkew(kx, ky, px, py);
        Bitmap ret = Bitmap.createBitmap(src, 0, 0, src.getWidth(), src.getHeight(), matrix, true);
        if (recycle && !src.isRecycled()) src.recycle();
        return ret;
    }
  
4.丸画像
    /**
     *       
     *
     * @param src        
     * @param recycle     
     * @return     
     */
    public static Bitmap toRound(Bitmap src, boolean recycle) {
        if (isEmptyBitmap(src)) return null;
        int width = src.getWidth();
        int height = src.getHeight();
        int radius = Math.min(width, height) >> 1;
        Bitmap ret = Bitmap.createBitmap(width, height, src.getConfig());
        Paint paint = new Paint();
        Canvas canvas = new Canvas(ret);
        Rect rect = new Rect(0, 0, width, height);
        paint.setAntiAlias(true);
        canvas.drawARGB(0, 0, 0, 0);
        canvas.drawCircle(width >> 1, height >> 1, radius, paint);
        paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
        canvas.drawBitmap(src, rect, rect, paint);
        if (recycle && !src.isRecycled()) src.recycle();
        return ret;
    }
  
5.ファジイ
    /**
     *       
     * 
     ，       ，        
     *
     * @param context    
     * @param src        
     * @param scale       (0...1)
     * @param radius      
     * @param recycle     
     * @return       
     */
    public static Bitmap fastBlur(Context context, Bitmap src, float scale, float radius, boolean recycle) {
        if (isEmptyBitmap(src)) return null;
        int width = src.getWidth();
        int height = src.getHeight();
        int scaleWidth = (int) (width * scale + 0.5f);
        int scaleHeight = (int) (height * scale + 0.5f);
        if (scaleWidth == 0 || scaleHeight == 0) return null;
        Bitmap scaleBitmap = Bitmap.createScaledBitmap(src, scaleWidth, scaleHeight, true);
        Paint paint = new Paint(Paint.FILTER_BITMAP_FLAG | Paint.ANTI_ALIAS_FLAG);
        Canvas canvas = new Canvas();
        PorterDuffColorFilter filter = new PorterDuffColorFilter(
                Color.TRANSPARENT, PorterDuff.Mode.SRC_ATOP);
        paint.setColorFilter(filter);
        canvas.scale(scale, scale);
        canvas.drawBitmap(scaleBitmap, 0, 0, paint);
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
            scaleBitmap = renderScriptBlur(context, scaleBitmap, radius);
        } else {
            scaleBitmap = stackBlur(scaleBitmap, (int) radius, recycle);
        }
        if (scale == 1) return scaleBitmap;
        Bitmap ret = Bitmap.createScaledBitmap(scaleBitmap, width, height, true);
        if (scaleBitmap != null && !scaleBitmap.isRecycled()) scaleBitmap.recycle();
        if (recycle && !src.isRecycled()) src.recycle();
        return ret;
    }