2 * Pixastic Lib - Sharpen filter - v0.1.0
3 * Copyright (c) 2008 Jacob Seidelin, jseidelin@nihilogic.dk, http://blog.nihilogic.dk/
4 * MIT License [http://www.opensource.org/licenses/mit-license.php]
7 Pixastic
.Actions
.sharpen
= {
8 process : function(params
) {
11 if (typeof params
.options
.amount
!= "undefined")
12 strength
= parseFloat(params
.options
.amount
)||0;
14 if (strength
< 0) strength
= 0;
15 if (strength
> 1) strength
= 1;
17 if (Pixastic
.Client
.hasCanvasImageData()) {
18 var data
= Pixastic
.prepareData(params
);
19 var dataCopy
= Pixastic
.prepareData(params
, true)
22 var mulOther
= 1 + 3*strength
;
26 [-mulOther
, mul
, -mulOther
],
31 for (var i
=0;i
<3;i
++) {
32 for (var j
=0;j
<3;j
++) {
33 weight
+= kernel
[i
][j
];
39 var rect
= params
.options
.rect
;
49 var offsetY
= (y
-1)*w4
;
51 var nextY
= (y
== h
) ? y
- 1 : y
;
52 var prevY
= (y
== 1) ? 0 : y
-2;
54 var offsetYPrev
= prevY
*w4
;
55 var offsetYNext
= nextY
*w4
;
59 var offset
= offsetY
+ (x
*4-4);
61 var offsetPrev
= offsetYPrev
+ ((x
== 1) ? 0 : x
-2) * 4;
62 var offsetNext
= offsetYNext
+ ((x
== w
) ? x
-1 : x
) * 4;
65 - dataCopy
[offsetPrev
]
68 - dataCopy
[offsetNext
]) * mulOther
69 + dataCopy
[offset
] * mul
73 - dataCopy
[offsetPrev
+1]
76 - dataCopy
[offsetNext
+1]) * mulOther
77 + dataCopy
[offset
+1] * mul
81 - dataCopy
[offsetPrev
+2]
84 - dataCopy
[offsetNext
+2]) * mulOther
85 + dataCopy
[offset
+2] * mul
92 if (r
> 255 ) r
= 255;
93 if (g
> 255 ) g
= 255;
94 if (b
> 255 ) b
= 255;
107 checkSupport : function() {
108 return Pixastic
.Client
.hasCanvasImageData();