nl_tokens: / * Compute the sample size as a function of minSideLength and maxNumOfPixels . minSideLength is used to specify that minimal width or height of a bitmap . maxNumOfPixels is used to specify the maximal size in pixels that are tolerable in terms of memory usage .
pl_tokens: private Bitmap transform ( Matrix scaler , Bitmap source , int targetWidth , int targetHeight , boolean scaleUp ) { int deltaX = source . getWidth ( ) - targetWidth ; int deltaY = source . getHeight ( ) - targetHeight ; if ( ! scaleUp && ( deltaX < 0 || deltaY < 0 ) ) { /*
               * In this case the bitmap is smaller, at least in one dimension,
               * than the target. Transform it by placing as much of the image as
               * possible into the target and leaving the top/bottom or left/right
               * (or both) black.
               */ Bitmap b2 = Bitmap . createBitmap ( targetWidth , targetHeight , Bitmap . Config . ARGB_8888 ) ; Canvas c = new Canvas ( b2 ) ; int deltaXHalf = Math . <mask> ( 0 , deltaX / 2 ) ; int deltaYHalf = Math . max ( 0 , deltaY / 2 ) ; Rect src = new Rect ( deltaXHalf , deltaYHalf , deltaXHalf + Math . min ( targetWidth , source . getWidth ( ) ) , deltaYHalf + Math . min ( targetHeight , source . getHeight ( ) ) ) ; int dstX = ( targetWidth - src . width ( ) ) / 2 ; int dstY = ( targetHeight - src . height ( ) ) / 2 ; Rect dst = new Rect ( dstX , dstY , targetWidth - dstX , targetHeight - dstY ) ; c . drawBitmap ( source , src , dst , null ) ; return b2 ; } float bitmapWidthF = source . getWidth ( ) ; float bitmapHeightF = source . getHeight ( ) ; float bitmapAspect = bitmapWidthF / bitmapHeightF ; float viewAspect = ( float ) targetWidth / targetHeight ; if ( bitmapAspect > viewAspect ) { float scale = targetHeight / bitmapHeightF ; if ( scale < .9F || scale > 1F ) { scaler . setScale ( scale , scale ) ; } else { scaler = null ; } } else { float scale = targetWidth / bitmapWidthF ; if ( scale < .9F || scale > 1F ) { scaler . setScale ( scale , scale ) ; } else { scaler = null ; } } Bitmap b1 ; if ( scaler != null ) { // this is used for minithumb and crop, so we want to mFilter here. b1 = Bitmap . createBitmap ( source , 0 , 0 , source . getWidth ( ) , source . getHeight ( ) , scaler , true ) ; } else { b1 = source ; } int dx1 = Math . max ( 0 , b1 . getWidth ( ) - targetWidth ) ; int dy1 = Math . max ( 0 , b1 . getHeight ( ) - targetHeight ) ; Bitmap b2 = Bitmap . createBitmap ( b1 , dx1 / 2 , dy1 / 2 , targetWidth , targetHeight ) ; if ( b1 != source ) { b1 . recycle ( ) ; } return b2 ; }