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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,54 @@ | ||
| // | ||
| // GaussianBlur.swift | ||
| // | ||
| // The MIT License | ||
| // Copyright (c) 2015 - 2018 Susan Cheng. All rights reserved. | ||
| // | ||
| // 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. | ||
| // | ||
|
|
||
| import Foundation | ||
|
|
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| @_inlineable | ||
| public func GaussianBlur<Model>(_ image: Image<ColorPixel<Model>>, _ blur: Double) -> Image<ColorPixel<Model>> { | ||
|
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| let t = 2 * blur * blur | ||
| let c = 1 / sqrt(.pi * t) | ||
| let _t = -1 / t | ||
|
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| let s = Int(ceil(6 * blur)) >> 1 | ||
|
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| let filter = (-s...s).map { exp(Double($0 * $0) * _t) as Double * c } | ||
|
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| return ImageConvolution(image, horizontal: filter, vertical: filter) | ||
| } | ||
|
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| @_inlineable | ||
| public func GaussianBlur<Model>(_ image: Image<FloatColorPixel<Model>>, _ blur: Float) -> Image<FloatColorPixel<Model>> { | ||
|
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| let t = 2 * blur * blur | ||
| let c = 1 / sqrt(.pi * t) | ||
| let _t = -1 / t | ||
|
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| let s = Int(ceil(6 * blur)) >> 1 | ||
|
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| let filter = (-s...s).map { exp(Float($0 * $0) * _t) as Float * c } | ||
|
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| return ImageConvolution(image, horizontal: filter, vertical: filter) | ||
| } |
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