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Update BlurFilter.js #617

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Update BlurFilter.js #617

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66 changes: 46 additions & 20 deletions src/easeljs/filters/BlurFilter.js
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Original file line number Diff line number Diff line change
Expand Up @@ -147,6 +147,8 @@ this.createjs = this.createjs||{};
/** docced in super class **/
p._applyFilter = function (imageData) {

premultiplyAlpha(imageData);

var radiusX = this.blurX >> 1;
if (isNaN(radiusX) || radiusX < 0) return false;
var radiusY = this.blurY >> 1;
Expand Down Expand Up @@ -296,15 +298,10 @@ this.createjs = this.createjs||{};
for ( y = 0; y < h; y++ )
{
p = yi << 2;
px[p+3] = pa =(a * ms) >>> ss;
if ( pa > 0 )
{
px[p] = ((r * ms) >>> ss );
px[p+1] = ((g * ms) >>> ss );
px[p+2] = ((b * ms) >>> ss );
} else {
px[p] = px[p+1] = px[p+2] = 0
}
px[p] = (r * ms) >>> ss;
px[p+1] = (g * ms) >>> ss;
px[p+2] = (b * ms) >>> ss;
px[p+3] = (a * ms) >>> ss;

p = ( x + (( ( p = y + ryp1) < h1 ? p : h1 ) * w )) << 2;

Expand All @@ -321,16 +318,10 @@ this.createjs = this.createjs||{};
for ( y = 0; y < h; y++ )
{
p = yi << 2;
px[p+3] = pa =(a * ms) >>> ss;
if ( pa > 0 )
{
pa = 255 / pa;
px[p] = ((r * ms) >>> ss ) * pa;
px[p+1] = ((g * ms) >>> ss ) * pa;
px[p+2] = ((b * ms) >>> ss ) * pa;
} else {
px[p] = px[p+1] = px[p+2] = 0
}
px[p] = (r * ms) >>> ss;
px[p+1] = (g * ms) >>> ss;
px[p+2] = (b * ms) >>> ss;
px[p+3] = (a * ms) >>> ss;

p = ( x + (( ( p = y + ryp1) < h1 ? p : h1 ) * w )) << 2;

Expand All @@ -347,8 +338,43 @@ this.createjs = this.createjs||{};
}

}

unpremultiplyAlpha(imageData);

return true;
};


function premultiplyAlpha(imageData)
{
var pixels = imageData.data;
var size = imageData.width * imageData.height * 4;

for (var i=0; i<size; i+=4)
{
var a = pixels[i+3] / 255;
pixels[i ] *= a;
pixels[i+1] *= a;
pixels[i+2] *= a;
}
}

function unpremultiplyAlpha(imageData)
{
var pixels = imageData.data;
var size = imageData.width * imageData.height * 4;

for (var i=0; i<size; i+=4)
{
var a = pixels[i+3];
if (a != 0)
{
a = 255 / a;
pixels[i ] *= a;
pixels[i+1] *= a;
pixels[i+2] *= a;
}
}
}

createjs.BlurFilter = createjs.promote(BlurFilter, "Filter");
}());