68 lines
2.5 KiB
Swift
68 lines
2.5 KiB
Swift
//
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// Copyright (c) 2017 Touch Instinct
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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//
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import CoreGraphics
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public extension CGImage {
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/// Crop image to square from center.
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///
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/// - Returns: A new cropped image or nil if something goes wrong.
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func cropFromCenterToSquare() -> CGImage? {
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let shortest = min(width, height)
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let widthCropSize = width > shortest ? (width - shortest) : 0
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let heightCropSize = height > shortest ? (height - shortest) : 0
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let left = widthCropSize / 2
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let top = heightCropSize / 2
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let cropRect = CGRect(x: left,
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y: top,
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width: width - widthCropSize,
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height: height - heightCropSize)
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return cropping(to: cropRect)
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}
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/// Crop image with given margin values.
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///
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/// - Parameters:
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/// - top: Top margin.
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/// - left: Left margin.
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/// - bottom: Bottom margin.
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/// - right: Right margin.
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/// - Returns: A new CGImage cropped with given paddings or nil if something goes wrong.
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func crop(top: CGFloat = 0,
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left: CGFloat = 0,
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bottom: CGFloat = 0,
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right: CGFloat = 0) -> CGImage? {
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let rect = CGRect(x: left,
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y: top,
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width: CGFloat(width) - left - right,
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height: CGFloat(height) - top - bottom)
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return cropping(to: rect)
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}
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}
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