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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,126 @@ | ||
| package utils | ||
| { | ||
| import flash.display.BitmapData; | ||
| import flash.filters.BitmapFilterQuality; | ||
| import flash.filters.BlurFilter; | ||
| import flash.geom.Point; | ||
|
|
||
| public class Bicubic | ||
| { | ||
| /** | ||
| * Resize an Image with bicubic interpolation | ||
| * @param width the new desired width | ||
| * @param height the new desired height | ||
| * @param bitmapData the original sized BitmapData | ||
| * @return | ||
| */ | ||
| public static function interpolateBicubic(bitmapData:BitmapData, width:int, height:int):BitmapData | ||
| { | ||
| // same size no need to resize | ||
| if( width == bitmapData.width && height == bitmapData.height ) | ||
| { | ||
| return bitmapData.clone(); | ||
| } | ||
|
|
||
| var interpolated :BitmapData = new BitmapData( width, height, true, 0x00000000 ); | ||
| var original_copy :BitmapData = bitmapData.clone(); | ||
|
|
||
| var xFactor:Number = bitmapData.width / interpolated.width; | ||
| var yFactor:Number = bitmapData.height / interpolated.height; | ||
|
|
||
| if (xFactor > 1 || yFactor > 1) | ||
| original_copy.applyFilter(original_copy, original_copy.rect, new Point(0, 0), new BlurFilter(1.4*(xFactor/2),1.4*(yFactor/2),BitmapFilterQuality.HIGH)); | ||
|
|
||
| var step:int = 0; | ||
| while ( step < interpolated.width ) | ||
| { | ||
| for (var y:int = 0; y < interpolated.height; y++){ | ||
| interpolated.setPixel32(step, y, getPixelBicubic32(step * xFactor, y * yFactor, original_copy)); | ||
| } | ||
| step++; | ||
| } | ||
|
|
||
| return interpolated; | ||
| } | ||
|
|
||
| private static function getPixelBicubic32( x:Number, y:Number, bitmapData:BitmapData ):Number | ||
| { | ||
| var i:int = int(x); | ||
| var j:int = int(y); | ||
|
|
||
| if (((i - 1) < 0) || ((j - 1) < 0)) | ||
| return bitmapData.getPixel32(i, j); | ||
| else if (((i + 1) >= bitmapData.width) || ((i + 2) >= bitmapData.width) || | ||
| ((j + 1) >= bitmapData.height) || ((j + 2) >= bitmapData.height)) | ||
| return bitmapData.getPixel32(i, j); | ||
|
|
||
| var dx :Number = x - i; | ||
| var dy :Number = y - j; | ||
| var asum:Number = 0; | ||
| var rsum:Number = 0; | ||
| var gsum:Number = 0; | ||
| var bsum:Number = 0; | ||
|
|
||
| var Rmdx:Array = new Array(4); | ||
| var Rdyn:Array = new Array(4); | ||
| for( var m:int = -1; m <= 2; ++m ) | ||
| Rmdx[m + 1] = A(m - dx); | ||
| for( var n:int = -1; n <= 2; ++n ) | ||
| Rdyn[n + 1] = A(dy - n); | ||
|
|
||
| for( m = -1; m <= 2; ++m ) | ||
| { | ||
| for (n = -1; n <= 2; ++n) | ||
| { | ||
| var rgb :int = bitmapData.getPixel32(i + m, j + n); | ||
| var a :int = (rgb >> 24) & 0x0FF; | ||
| var r :int = (rgb >> 16) & 0x0FF; | ||
| var g :int = (rgb >> 8) & 0x0FF; | ||
| var b :int = (rgb >> 0) & 0x0FF; | ||
|
|
||
| var Rres:Number = Rmdx[m + 1] * Rdyn[n + 1]; | ||
| asum += a * Rres; | ||
| rsum += r * Rres; | ||
| gsum += g * Rres; | ||
| bsum += b * Rres; | ||
| } | ||
| } | ||
|
|
||
| var alpha:int = (int)(asum + 0.5); | ||
| if(alpha < 0) | ||
| alpha = 0; | ||
| else if(alpha > 255) | ||
| alpha = 255; | ||
|
|
||
| var red:int = (int)(rsum + 0.5); | ||
| if(red < 0) | ||
| red = 0; | ||
| else if(red > 255) | ||
| red = 255; | ||
|
|
||
| var green:int = (int)(gsum + 0.5); | ||
| if(green < 0) | ||
| green = 0; | ||
| else if(green > 255) | ||
| green = 255; | ||
|
|
||
| var blue:int = (int)(bsum + 0.5); | ||
| if(blue < 0) | ||
| blue = 0; | ||
| else if(blue > 255) | ||
| blue = 255; | ||
|
|
||
| return (alpha << 24) | (red << 16) | (green << 8) | (blue << 0); | ||
| } | ||
|
|
||
| private static function A( x:Number ):Number | ||
| { | ||
| var p0:Number = ((x + 2) > 0) ? (x + 2) : 0; | ||
| var p1:Number = ((x + 1) > 0) ? (x + 1) : 0; | ||
| var p2:Number = (x > 0) ? x : 0; | ||
| var p3:Number = ((x - 1) > 0) ? (x - 1) : 0; | ||
|
|
||
| return (1 / 6) * (p0 * p0 * p0 - 4 * (p1 * p1 * p1) + 6 * (p2 * p2 * p2) - 4 * (p3 * p3 * p3)); | ||
| } | ||
| } | ||
| } |
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