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iOSTask/Pods/AlamofireImage/Source/UIImage+AlamofireImage.swift
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//
// UIImage+AlamofireImage.swift
//
// Copyright (c) 2015 Alamofire Software Foundation (http://alamofire.org/)
//
// 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.
//
#if os(iOS) || os(tvOS) || os(watchOS)
import Alamofire
import CoreGraphics
import Foundation
import UIKit
// MARK: Initialization
private let lock = NSLock()
extension UIImage: AlamofireExtended {}
extension AlamofireExtension where ExtendedType: UIImage {
/// Initializes and returns the image object with the specified data in a thread-safe manner.
///
/// It has been reported that there are thread-safety issues when initializing large amounts of images
/// simultaneously. In the event of these issues occurring, this method can be used in place of
/// the `init?(data:)` method.
///
/// - parameter data: The data object containing the image data.
///
/// - returns: An initialized `UIImage` object, or `nil` if the method failed.
public static func threadSafeImage(with data: Data) -> UIImage? {
lock.lock()
let image = UIImage(data: data)
lock.unlock()
return image
}
/// Initializes and returns the image object with the specified data and scale in a thread-safe manner.
///
/// It has been reported that there are thread-safety issues when initializing large amounts of images
/// simultaneously. In the event of these issues occurring, this method can be used in place of
/// the `init?(data:scale:)` method.
///
/// - parameter data: The data object containing the image data.
/// - parameter scale: The scale factor to assume when interpreting the image data. Applying a scale factor of 1.0
/// results in an image whose size matches the pixel-based dimensions of the image. Applying a
/// different scale factor changes the size of the image as reported by the size property.
///
/// - returns: An initialized `UIImage` object, or `nil` if the method failed.
public static func threadSafeImage(with data: Data, scale: CGFloat) -> UIImage? {
lock.lock()
let image = UIImage(data: data, scale: scale)
lock.unlock()
return image
}
}
extension UIImage {
@available(*, deprecated, message: "Replaced by `UIImage.af.threadSafeImage(with:)`")
public static func af_threadSafeImage(with data: Data) -> UIImage? {
af.threadSafeImage(with: data)
}
@available(*, deprecated, message: "Replaced by `UIImage.af.threadSafeImage(with:scale:)`")
public static func af_threadSafeImage(with data: Data, scale: CGFloat) -> UIImage? {
af.threadSafeImage(with: data, scale: scale)
}
}
// MARK: - Inflation
extension AlamofireExtension where ExtendedType: UIImage {
/// Returns whether the image is inflated.
public var isInflated: Bool {
get {
if let isInflated = objc_getAssociatedObject(type, &AssociatedKeys.isInflated) as? Bool {
return isInflated
} else {
return false
}
}
nonmutating set {
objc_setAssociatedObject(type, &AssociatedKeys.isInflated, newValue, .OBJC_ASSOCIATION_RETAIN_NONATOMIC)
}
}
/// Inflates the underlying compressed image data to be backed by an uncompressed bitmap representation.
///
/// Inflating compressed image formats (such as PNG or JPEG) can significantly improve drawing performance as it
/// allows a bitmap representation to be constructed in the background rather than on the main thread.
public func inflate() {
guard !isInflated else { return }
isInflated = true
_ = type.cgImage?.dataProvider?.data
}
}
extension UIImage {
@available(*, deprecated, message: "Replaced by `image.af.isInflated`")
public var af_inflated: Bool {
af.isInflated
}
@available(*, deprecated, message: "Replaced by `image.af.inflate()`")
public func af_inflate() {
af.inflate()
}
}
// MARK: - Alpha
extension AlamofireExtension where ExtendedType: UIImage {
/// Returns whether the image contains an alpha component.
public var containsAlphaComponent: Bool {
let alphaInfo = type.cgImage?.alphaInfo
return (
alphaInfo == .first ||
alphaInfo == .last ||
alphaInfo == .premultipliedFirst ||
alphaInfo == .premultipliedLast
)
}
/// Returns whether the image is opaque.
public var isOpaque: Bool { !containsAlphaComponent }
}
extension UIImage {
@available(*, deprecated, message: "Replaced by `image.af.containsAlphaComponent`")
public var af_containsAlphaComponent: Bool { af.containsAlphaComponent }
@available(*, deprecated, message: "Replaced by `image.af.isOpaque`")
public var af_isOpaque: Bool { af.isOpaque }
}
// MARK: - Scaling
extension AlamofireExtension where ExtendedType: UIImage {
/// Returns a new version of the image scaled to the specified size.
///
/// - Parameters:
/// - size: The size to use when scaling the new image.
/// - scale: The scale to set for the new image. Defaults to `nil` which will maintain the current image scale.
///
/// - Returns: The new image object.
public func imageScaled(to size: CGSize, scale: CGFloat? = nil) -> UIImage {
assert(size.width > 0 && size.height > 0, "You cannot safely scale an image to a zero width or height")
UIGraphicsBeginImageContextWithOptions(size, isOpaque, scale ?? type.scale)
type.draw(in: CGRect(origin: .zero, size: size))
let scaledImage = UIGraphicsGetImageFromCurrentImageContext() ?? type
UIGraphicsEndImageContext()
return scaledImage
}
/// Returns a new version of the image scaled from the center while maintaining the aspect ratio to fit within
/// a specified size.
///
/// The resulting image contains an alpha component used to pad the width or height with the necessary transparent
/// pixels to fit the specified size. In high performance critical situations, this may not be the optimal approach.
/// To maintain an opaque image, you could compute the `scaledSize` manually, then use the `af.imageScaledToSize`
/// method in conjunction with a `.Center` content mode to achieve the same visual result.
///
/// - Parameters:
/// - size: The size to use when scaling the new image.
/// - scale: The scale to set for the new image. Defaults to `nil` which will maintain the current image scale.
///
/// - Returns: A new image object.
public func imageAspectScaled(toFit size: CGSize, scale: CGFloat? = nil) -> UIImage {
assert(size.width > 0 && size.height > 0, "You cannot safely scale an image to a zero width or height")
let imageAspectRatio = type.size.width / type.size.height
let canvasAspectRatio = size.width / size.height
var resizeFactor: CGFloat
if imageAspectRatio > canvasAspectRatio {
resizeFactor = size.width / type.size.width
} else {
resizeFactor = size.height / type.size.height
}
let scaledSize = CGSize(width: type.size.width * resizeFactor, height: type.size.height * resizeFactor)
let origin = CGPoint(x: (size.width - scaledSize.width) / 2.0, y: (size.height - scaledSize.height) / 2.0)
UIGraphicsBeginImageContextWithOptions(size, false, scale ?? type.scale)
type.draw(in: CGRect(origin: origin, size: scaledSize))
let scaledImage = UIGraphicsGetImageFromCurrentImageContext() ?? type
UIGraphicsEndImageContext()
return scaledImage
}
/// Returns a new version of the image scaled from the center while maintaining the aspect ratio to fill a
/// specified size. Any pixels that fall outside the specified size are clipped.
///
/// - Parameters:
/// - size: The size to use when scaling the new image.
/// - scale: The scale to set for the new image. Defaults to `nil` which will maintain the current image scale.
///
/// - Returns: A new image object.
public func imageAspectScaled(toFill size: CGSize, scale: CGFloat? = nil) -> UIImage {
assert(size.width > 0 && size.height > 0, "You cannot safely scale an image to a zero width or height")
let imageAspectRatio = type.size.width / type.size.height
let canvasAspectRatio = size.width / size.height
var resizeFactor: CGFloat
if imageAspectRatio > canvasAspectRatio {
resizeFactor = size.height / type.size.height
} else {
resizeFactor = size.width / type.size.width
}
let scaledSize = CGSize(width: type.size.width * resizeFactor, height: type.size.height * resizeFactor)
let origin = CGPoint(x: (size.width - scaledSize.width) / 2.0, y: (size.height - scaledSize.height) / 2.0)
UIGraphicsBeginImageContextWithOptions(size, isOpaque, scale ?? type.scale)
type.draw(in: CGRect(origin: origin, size: scaledSize))
let scaledImage = UIGraphicsGetImageFromCurrentImageContext() ?? type
UIGraphicsEndImageContext()
return scaledImage
}
}
extension UIImage {
@available(*, deprecated, message: "Replaced by `image.af.imageScale(to:scale:)`")
public func af_imageScaled(to size: CGSize, scale: CGFloat? = nil) -> UIImage {
af.imageScaled(to: size, scale: scale)
}
@available(*, deprecated, message: "Replaced by `image.af.imageAspectScale(toFit:scale:)`")
public func af_imageAspectScaled(toFit size: CGSize, scale: CGFloat? = nil) -> UIImage {
af.imageAspectScaled(toFit: size, scale: scale)
}
@available(*, deprecated, message: "Replaced by `image.af.imageAspectScale(toFill:scale:)`")
public func af_imageAspectScaled(toFill size: CGSize, scale: CGFloat? = nil) -> UIImage {
af.imageAspectScaled(toFill: size, scale: scale)
}
}
// MARK: - Rounded Corners
extension AlamofireExtension where ExtendedType: UIImage {
/// Returns a new version of the image with the corners rounded to the specified radius.
///
/// - Parameters:
/// - radius: The radius to use when rounding the new image.
/// - divideRadiusByImageScale: Whether to divide the radius by the image scale. Set to `true` when the image has
/// the same resolution for all screen scales such as @1x, @2x and @3x (i.e. single
/// image from web server). Set to `false` for images loaded from an asset catalog
/// with varying resolutions for each screen scale. `false` by default.
///
/// - Returns: A new image object.
public func imageRounded(withCornerRadius radius: CGFloat, divideRadiusByImageScale: Bool = false) -> UIImage {
let size = type.size
let scale = type.scale
UIGraphicsBeginImageContextWithOptions(size, false, scale)
let scaledRadius = divideRadiusByImageScale ? radius / scale : radius
let clippingPath = UIBezierPath(roundedRect: CGRect(origin: CGPoint.zero, size: size), cornerRadius: scaledRadius)
clippingPath.addClip()
type.draw(in: CGRect(origin: CGPoint.zero, size: size))
let roundedImage = UIGraphicsGetImageFromCurrentImageContext()!
UIGraphicsEndImageContext()
return roundedImage
}
/// Returns a new version of the image rounded into a circle.
///
/// - Returns: A new image object.
public func imageRoundedIntoCircle() -> UIImage {
let size = type.size
let radius = min(size.width, size.height) / 2.0
var squareImage: UIImage = type
if size.width != size.height {
let squareDimension = min(size.width, size.height)
let squareSize = CGSize(width: squareDimension, height: squareDimension)
squareImage = imageAspectScaled(toFill: squareSize)
}
UIGraphicsBeginImageContextWithOptions(squareImage.size, false, type.scale)
let clippingPath = UIBezierPath(roundedRect: CGRect(origin: CGPoint.zero, size: squareImage.size),
cornerRadius: radius)
clippingPath.addClip()
squareImage.draw(in: CGRect(origin: CGPoint.zero, size: squareImage.size))
let roundedImage = UIGraphicsGetImageFromCurrentImageContext()!
UIGraphicsEndImageContext()
return roundedImage
}
}
extension UIImage {
@available(*, deprecated, message: "Replaced by `image.af.imageRounded(withCornerRadius:divideRadiusByImageScale:)`")
public func af_imageRounded(withCornerRadius radius: CGFloat, divideRadiusByImageScale: Bool = false) -> UIImage {
af.imageRounded(withCornerRadius: radius, divideRadiusByImageScale: divideRadiusByImageScale)
}
@available(*, deprecated, message: "Replaced by `image.af.imageRoundedIntoCircle()`")
public func af_imageRoundedIntoCircle() -> UIImage {
af.imageRoundedIntoCircle()
}
}
#endif
#if os(iOS) || os(tvOS)
import CoreImage
// MARK: - Core Image Filters
extension AlamofireExtension where ExtendedType: UIImage {
/// Returns a new version of the image using a CoreImage filter with the specified name and parameters.
///
/// - Parameters:
/// - name: The name of the CoreImage filter to use on the new image.
/// - parameters: The parameters to apply to the CoreImage filter.
///
/// - Returns: A new image object, or `nil` if the filter failed for any reason.
public func imageFiltered(withCoreImageFilter name: String, parameters: [String: Any]? = nil) -> UIImage? {
var image: CoreImage.CIImage? = type.ciImage
if image == nil, let CGImage = type.cgImage {
image = CoreImage.CIImage(cgImage: CGImage)
}
guard let coreImage = image else { return nil }
let context = CIContext(options: [.priorityRequestLow: true])
var parameters: [String: Any] = parameters ?? [:]
parameters[kCIInputImageKey] = coreImage
guard let filter = CIFilter(name: name, parameters: parameters) else { return nil }
guard let outputImage = filter.outputImage else { return nil }
let cgImageRef = context.createCGImage(outputImage, from: outputImage.extent)
return UIImage(cgImage: cgImageRef!, scale: type.scale, orientation: type.imageOrientation)
}
}
extension UIImage {
@available(*, deprecated, message: "Replaced by `image.af.imageFiltered(withCoreImageFilter:parameters:)`")
public func af_imageFiltered(withCoreImageFilter name: String, parameters: [String: Any]? = nil) -> UIImage? {
af.imageFiltered(withCoreImageFilter: name, parameters: parameters)
}
}
#endif
// MARK: -
private enum AssociatedKeys {
static var isInflated = "UIImage.af.isInflated"
}