57 lines
2.1 KiB
Swift
57 lines
2.1 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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struct PaddingDrawingOperation: DrawingOperation {
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private let image: CGImage
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private let imageSize: CGSize
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private let padding: CGFloat
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public init(image: CGImage, imageSize: CGSize, padding: CGFloat) {
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self.image = image
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self.imageSize = imageSize
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self.padding = padding
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}
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public var contextSize: CGContextSize {
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let width = Int(ceil(imageSize.width + padding * 2))
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let height = Int(ceil(imageSize.height + padding * 2))
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return (width: width, height: height)
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}
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public func apply(in context: CGContext) {
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// Draw the image in the center of the context, leaving a gap around the edges
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let imageLocation = CGRect(x: padding,
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y: padding,
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width: imageSize.width,
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height: imageSize.height)
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context.addRect(imageLocation)
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context.clip()
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context.draw(image, in: imageLocation)
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}
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}
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