Function filterGaussBlurRGBA

kinetic.js:4440–4675

( imageData, radius)

    ];

    function filterGaussBlurRGBA( imageData, radius) {

        var pixels = imageData.data,
            width = imageData.width,
            height = imageData.height;

        var x, y, i, p, yp, yi, yw, r_sum, g_sum, b_sum, a_sum,
            r_out_sum, g_out_sum, b_out_sum, a_out_sum,
            r_in_sum, g_in_sum, b_in_sum, a_in_sum,
            pr, pg, pb, pa, rbs;

        var div = radius + radius + 1,
            widthMinus1  = width - 1,
            heightMinus1 = height - 1,
            radiusPlus1  = radius + 1,
            sumFactor = radiusPlus1 * ( radiusPlus1 + 1 ) / 2,
            stackStart = new BlurStack(),
            stackEnd = null,
            stack = stackStart,
            stackIn = null,
            stackOut = null,
            mul_sum = mul_table[radius],
            shg_sum = shg_table[radius];

        for ( i = 1; i < div; i++ ) {
            stack = stack.next = new BlurStack();
            if ( i == radiusPlus1 ){
                stackEnd = stack;
            }
        }

        stack.next = stackStart;

        yw = yi = 0;

        for ( y = 0; y < height; y++ )
        {
            r_in_sum = g_in_sum = b_in_sum = a_in_sum = r_sum = g_sum = b_sum = a_sum = 0;

            r_out_sum = radiusPlus1 * ( pr = pixels[yi] );
            g_out_sum = radiusPlus1 * ( pg = pixels[yi+1] );
            b_out_sum = radiusPlus1 * ( pb = pixels[yi+2] );
            a_out_sum = radiusPlus1 * ( pa = pixels[yi+3] );

            r_sum += sumFactor * pr;
            g_sum += sumFactor * pg;
            b_sum += sumFactor * pb;
            a_sum += sumFactor * pa;

            stack = stackStart;

            for( i = 0; i < radiusPlus1; i++ )
            {
                stack.r = pr;
                stack.g = pg;
                stack.b = pb;
                stack.a = pa;
                stack = stack.next;