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glitch-images/scripts/lib/superfast-blur.0.5.js
Georg Fischer cca32d920e initial commit
2013-06-27 14:52:28 +02:00

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JavaScript
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/*global define*/
/*
Superfast Blur - a fast Box Blur For Canvas
Version: 0.5
Author: Mario Klingemann
Contact: mario@quasimondo.com
Website: http://www.quasimondo.com/BoxBlurForCanvas
Twitter: @quasimondo
In case you find this class useful - especially in commercial projects -
I am not totally unhappy for a small donation to my PayPal account
mario@quasimondo.de
Or support me on flattr:
https://flattr.com/thing/140066/Superfast-Blur-a-pretty-fast-Box-Blur-Effect-for-CanvasJavascript
Copyright (c) 2011 Mario Klingemann
Note by Georg Fischer (snorpey@gmail.com / @snorpey):
While much of the original algorithm is still the same,
I modified some parts of the script to fit my needs:
- removed the iterations argument
- modified the functions to accept an imageData object
instead of element ids to remove dependency on the
document object.
- added AMD / requirejs wrapper
Permission is hereby granted, free of charge, to any person
obtaining a copy of this software and associated documentation
files (the "Software"), to deal in the Software without
restriction, including without limitation the rights to use,
copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following
conditions:
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
OTHER DEALINGS IN THE SOFTWARE.
*/
define(
function()
{
var mul_table = [
1,57,41,21,203,34,97,73,227,91,149,62,105,45,39,137,241,107,3,173,39,71,65,238,219,101,
187,87,81,151,141,133,249,117,221,209,197,187,177,169,5,153,73,139,133,127,243,233,223,
107,103,99,191,23,177,171,165,159,77,149,9,139,135,131,253,245,119,231,224,109,211,103,
25,195,189,23,45,175,171,83,81,79,155,151,147,9,141,137,67,131,129,251,123,30,235,115,
113,221,217,53,13,51,50,49,193,189,185,91,179,175,43,169,83,163,5,79,155,19,75,147,145,
143,35,69,17,67,33,65,255,251,247,243,239,59,29,229,113,111,219,27,213,105,207,51,201,
199,49,193,191,47,93,183,181,179,11,87,43,85,167,165,163,161,159,157,155,77,19,75,37,
73,145,143,141,35,138,137,135,67,33,131,129,255,63,250,247,61,121,239,237,117,29,229,
227,225,111,55,109,216,213,211,209,207,205,203,201,199,197,195,193,48,190,47,93,185,
183,181,179,178,176,175,173,171,85,21,167,165,41,163,161,5,79,157,78,154,153,19,75,
149,74,147,73,144,143,71,141,140,139,137,17,135,134,133,66,131,65,129,1
];
var shg_table = [
0,9,10,10,14,12,14,14,16,15,16,15,16,15,15,17,18,17,12,18,16,17,17,19,19,18,19,18,18,
19,19,19,20,19,20,20,20,20,20,20,15,20,19,20,20,20,21,21,21,20,20,20,21,18,21,21,21,
21,20,21,17,21,21,21,22,22,21,22,22,21,22,21,19,22,22,19,20,22,22,21,21,21,22,22,22,
18,22,22,21,22,22,23,22,20,23,22,22,23,23,21,19,21,21,21,23,23,23,22,23,23,21,23,22,
23,18,22,23,20,22,23,23,23,21,22,20,22,21,22,24,24,24,24,24,22,21,24,23,23,24,21,24,
23,24,22,24,24,22,24,24,22,23,24,24,24,20,23,22,23,24,24,24,24,24,24,24,23,21,23,22,
23,24,24,24,22,24,24,24,23,22,24,24,25,23,25,25,23,24,25,25,24,22,25,25,25,24,23,24,
25,25,25,25,25,25,25,25,25,25,25,25,23,25,23,24,25,25,25,25,25,25,25,25,25,24,22,25,
25,23,25,25,20,24,25,24,25,25,22,24,25,24,25,24,25,25,24,25,25,25,25,22,25,25,25,24,
25,24,25,18
];
function boxBlurCanvas( image_data, radius, blur_alpha_channel )
{
var result = image_data;
if ( ! ( isNaN( radius ) || radius < 1 ) )
{
if ( blur_alpha_channel )
{
result = boxBlurCanvasRGBA( image_data, radius );
}
else
{
result = boxBlurCanvasRGB( image_data, radius );
}
}
return result;
}
function boxBlurCanvasRGBA( image_data, radius )
{
radius |= 0;
var pixels = image_data.data;
var width = image_data.width;
var height = image_data.height;
var rsum, gsum, bsum, asum, x, y, i, p, p1, p2, yp, yi, yw, idx, pa;
var wm = width - 1;
var hm = height - 1;
var wh = width * height;
var rad1 = radius + 1;
var mul_sum = mul_table[radius];
var shg_sum = shg_table[radius];
var r = [ ];
var g = [ ];
var b = [ ];
var a = [ ];
var vmin = [ ];
var vmax = [ ];
yw = yi = 0;
for ( y = 0; y < height; y++ )
{
rsum = pixels[yw] * rad1;
gsum = pixels[yw + 1] * rad1;
bsum = pixels[yw + 2] * rad1;
asum = pixels[yw + 3] * rad1;
for ( i = 1; i <= radius; i++ )
{
p = yw + ( ( ( i > wm ? wm : i ) ) << 2 );
rsum += pixels[p++];
gsum += pixels[p++];
bsum += pixels[p++];
asum += pixels[p];
}
for ( x = 0; x < width; x++ )
{
r[yi] = rsum;
g[yi] = gsum;
b[yi] = bsum;
a[yi] = asum;
if ( y === 0 )
{
vmin[x] = ( ( p = x + rad1) < wm ? p : wm ) << 2;
vmax[x] = ( ( p = x - radius) > 0 ? p << 2 : 0 );
}
p1 = yw + vmin[x];
p2 = yw + vmax[x];
rsum += pixels[p1++] - pixels[p2++];
gsum += pixels[p1++] - pixels[p2++];
bsum += pixels[p1++] - pixels[p2++];
asum += pixels[p1] - pixels[p2];
yi++;
}
yw += ( width << 2 );
}
for ( x = 0; x < width; x++ )
{
yp = x;
rsum = r[yp] * rad1;
gsum = g[yp] * rad1;
bsum = b[yp] * rad1;
asum = a[yp] * rad1;
for ( i = 1; i <= radius; i++ )
{
yp += ( i > hm ? 0 : width );
rsum += r[yp];
gsum += g[yp];
bsum += b[yp];
asum += a[yp];
}
yi = x << 2;
for ( y = 0; y < height; y++ )
{
pixels[yi + 3] = pa = ( asum * mul_sum ) >>> shg_sum;
if ( pa > 0 )
{
pa = 255 / pa;
pixels[yi] = ( ( rsum * mul_sum ) >>> shg_sum ) * pa;
pixels[yi+1] = ( ( gsum * mul_sum ) >>> shg_sum ) * pa;
pixels[yi+2] = ( ( bsum * mul_sum ) >>> shg_sum ) * pa;
}
else
{
pixels[yi] = pixels[yi + 1] = pixels[yi + 2] = 0;
}
if ( x === 0 )
{
vmin[y] = ( ( p = y + rad1) < hm ? p : hm ) * width;
vmax[y] = ( ( p = y - radius) > 0 ? p * width : 0 );
}
p1 = x + vmin[y];
p2 = x + vmax[y];
rsum += r[p1] - r[p2];
gsum += g[p1] - g[p2];
bsum += b[p1] - b[p2];
asum += a[p1] - a[p2];
yi += width << 2;
}
}
return image_data;
}
function boxBlurCanvasRGB( image_data, radius )
{
radius |= 0;
var pixels = image_data.data;
var width = image_data.width;
var height = image_data.height;
var rsum, gsum, bsum, asum, x, y, i, p, p1, p2, yp, yi, yw, idx;
var wm = width - 1;
var hm = height - 1;
var wh = width * height;
var rad1 = radius + 1;
var r = [ ];
var g = [ ];
var b = [ ];
var mul_sum = mul_table[radius];
var shg_sum = shg_table[radius];
var vmin = [ ];
var vmax = [ ];
yw = yi = 0;
for ( y = 0; y < height; y++ )
{
rsum = pixels[yw] * rad1;
gsum = pixels[yw + 1] * rad1;
bsum = pixels[yw + 2] * rad1;
for ( i = 1; i <= radius; i++ )
{
p = yw + ( ( ( i > wm ? wm : i ) ) << 2 );
rsum += pixels[p++];
gsum += pixels[p++];
bsum += pixels[p++];
}
for ( x = 0; x < width; x++ )
{
r[yi] = rsum;
g[yi] = gsum;
b[yi] = bsum;
if ( y === 0 )
{
vmin[x] = ( ( p = x + rad1) < wm ? p : wm ) << 2;
vmax[x] = ( ( p = x - radius) > 0 ? p << 2 : 0 );
}
p1 = yw + vmin[x];
p2 = yw + vmax[x];
rsum += pixels[p1++] - pixels[p2++];
gsum += pixels[p1++] - pixels[p2++];
bsum += pixels[p1++] - pixels[p2++];
yi++;
}
yw += ( width << 2 );
}
for ( x = 0; x < width; x++ )
{
yp = x;
rsum = r[yp] * rad1;
gsum = g[yp] * rad1;
bsum = b[yp] * rad1;
for ( i = 1; i <= radius; i++ )
{
yp += ( i > hm ? 0 : width );
rsum += r[yp];
gsum += g[yp];
bsum += b[yp];
}
yi = x << 2;
for ( y = 0; y < height; y++ )
{
pixels[yi] = (rsum * mul_sum) >>> shg_sum;
pixels[yi+1] = (gsum * mul_sum) >>> shg_sum;
pixels[yi+2] = (bsum * mul_sum) >>> shg_sum;
if ( x === 0 )
{
vmin[y] = ( ( p = y + rad1) < hm ? p : hm ) * width;
vmax[y] = ( ( p = y - radius) > 0 ? p * width : 0 );
}
p1 = x + vmin[y];
p2 = x + vmax[y];
rsum += r[p1] - r[p2];
gsum += g[p1] - g[p2];
bsum += b[p1] - b[p2];
yi += width << 2;
}
}
return image_data;
}
return boxBlurCanvas;
}
);
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