A Methodology for Fine- Grained Parallelism in JavaScript ...

Pixastic Benchmarks
Ported 4 image processing routines: invert, sepia, sharpen,
and edge detection
Original Invert Code
function invert_ref(params)
{
var data = Pixastic.prepareData(params);
var invertAlpha =
!!params.options.invertAlpha;
}
var rect = params.options.rect;
var p = rect.width * rect.height;
var pix = p*4, pix1 = pix + 1,
var pix2 = pix + 2, pix3 = pix + 3;
while (p--) {
data[pix-=4] = 255 - data[pix];
data[pix1-=4] = 255 - data[pix1];
data[pix2-=4] = 255 - data[pix2];
if (invertAlpha)
data[pix3-=4] = 255 - data[pix3];
}
return true;
Sluice Invert Code
function invert_sluice(data, invert_alpha)
{
this.invertAlpha = invert_alpha;
this.data = data;
}
this.work = function () {
var w = this.pop();
var h = this.pop();
var p = w * h;
};
var pix = p*4, pix1 = pix + 1;
var pix2 = pix + 2, pix3 = pix + 3;
while (p--) {
this.data[pix-=4] = 255 - this.data[pix];
this.data[pix1-=4] = 255 - this.data[pix1];
this.data[pix2-=4] = 255 - this.data[pix2];
if (this.invertAlpha)
this.data[pix3-=4] = 255 - this.data[pix3];
}
this.push(w);
this.push(h);
return false;