102 lines
3.7 KiB
Swift
102 lines
3.7 KiB
Swift
/*
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Copyright 2019 New Vector Ltd
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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import Foundation
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extension UIImage {
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class func vc_image(from color: UIColor, size: CGSize = CGSize(width: 1, height: 1)) -> UIImage? {
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let rect = CGRect(x: 0, y: 0, width: size.width, height: size.height)
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UIGraphicsBeginImageContext(rect.size)
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let context = UIGraphicsGetCurrentContext()
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context?.setFillColor(color.cgColor)
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context?.fill(rect)
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var image = UIGraphicsGetImageFromCurrentImageContext()
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UIGraphicsEndImageContext()
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UIGraphicsBeginImageContext(size)
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image?.draw(in: rect)
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image = UIGraphicsGetImageFromCurrentImageContext()
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UIGraphicsEndImageContext()
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return image
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}
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@objc func vc_tintedImage(usingColor tintColor: UIColor) -> UIImage? {
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UIGraphicsBeginImageContextWithOptions(self.size, false, self.scale)
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let drawRect = CGRect(x: 0, y: 0, width: self.size.width, height: self.size.height)
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self.draw(in: drawRect)
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tintColor.set()
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UIRectFillUsingBlendMode(drawRect, .sourceAtop)
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let tintedImage: UIImage? = UIGraphicsGetImageFromCurrentImageContext()
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UIGraphicsEndImageContext()
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return tintedImage
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}
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@objc func vc_withAlpha(_ alpha: CGFloat) -> UIImage? {
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UIGraphicsBeginImageContextWithOptions(size, false, scale)
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draw(at: .zero, blendMode: .normal, alpha: alpha)
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let newImage = UIGraphicsGetImageFromCurrentImageContext()
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UIGraphicsEndImageContext()
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return newImage
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}
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// Based on https://stackoverflow.com/a/31314494
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@objc func vc_resized(with targetSize: CGSize) -> UIImage? {
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let originalRenderingMode = self.renderingMode
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let size = self.size
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let widthRatio = targetSize.width/size.width
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let heightRatio = targetSize.height/size.height
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// Figure out what our orientation is, and use that to form the rectangle
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let newSize: CGSize
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if widthRatio > heightRatio {
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newSize = CGSize(width: size.width * heightRatio, height: size.height * heightRatio)
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} else {
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newSize = CGSize(width: size.width * widthRatio, height: size.height * widthRatio)
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}
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let rect = CGRect(origin: .zero, size: newSize)
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UIGraphicsBeginImageContextWithOptions(newSize, false, 0)
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draw(in: rect)
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let newImage = UIGraphicsGetImageFromCurrentImageContext()
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UIGraphicsEndImageContext()
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return newImage?.withRenderingMode(originalRenderingMode)
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}
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@objc func vc_notRenderedImage() -> UIImage {
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if let cgImage = cgImage {
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return NotRenderedImage(cgImage: cgImage, scale: UIScreen.main.scale, orientation: .up)
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} else if let ciImage = ciImage {
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return NotRenderedImage(ciImage: ciImage, scale: UIScreen.main.scale, orientation: .up)
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}
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return self
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}
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// inline class to disable rendering
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private class NotRenderedImage: UIImage {
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override func withRenderingMode(_ renderingMode: UIImage.RenderingMode) -> UIImage {
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return self
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}
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}
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}
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