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417 lines
16 KiB
417 lines
16 KiB
//
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// ImageFilter.swift
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//
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// Copyright (c) 2015 Alamofire Software Foundation (http://alamofire.org/)
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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 Foundation
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#if os(iOS) || os(tvOS) || os(watchOS)
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import UIKit
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#elseif os(macOS)
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import Cocoa
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#endif
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// MARK: ImageFilter
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/// The `ImageFilter` protocol defines properties for filtering an image as well as identification of the filter.
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public protocol ImageFilter {
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/// A closure used to create an alternative representation of the given image.
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var filter: (Image) -> Image { get }
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/// The string used to uniquely identify the filter operation.
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var identifier: String { get }
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}
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extension ImageFilter {
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/// The unique identifier for any `ImageFilter` type.
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public var identifier: String { "\(type(of: self))" }
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}
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// MARK: - Sizable
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/// The `Sizable` protocol defines a size property intended for use with `ImageFilter` types.
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public protocol Sizable {
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/// The size of the type.
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var size: CGSize { get }
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}
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extension ImageFilter where Self: Sizable {
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/// The unique idenitifier for an `ImageFilter` conforming to the `Sizable` protocol.
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public var identifier: String {
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let width = Int64(size.width.rounded())
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let height = Int64(size.height.rounded())
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return "\(type(of: self))-size:(\(width)x\(height))"
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}
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}
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// MARK: - Roundable
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/// The `Roundable` protocol defines a radius property intended for use with `ImageFilter` types.
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public protocol Roundable {
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/// The radius of the type.
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var radius: CGFloat { get }
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}
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extension ImageFilter where Self: Roundable {
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/// The unique idenitifier for an `ImageFilter` conforming to the `Roundable` protocol.
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public var identifier: String {
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let radius = Int64(self.radius.rounded())
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return "\(type(of: self))-radius:(\(radius))"
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}
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}
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// MARK: - DynamicImageFilter
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/// The `DynamicImageFilter` class simplifies custom image filter creation by using a trailing closure initializer.
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public struct DynamicImageFilter: ImageFilter {
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/// The string used to uniquely identify the image filter operation.
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public let identifier: String
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/// A closure used to create an alternative representation of the given image.
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public let filter: (Image) -> Image
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/// Initializes the `DynamicImageFilter` instance with the specified identifier and filter closure.
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///
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/// - parameter identifier: The unique identifier of the filter.
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/// - parameter filter: A closure used to create an alternative representation of the given image.
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///
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/// - returns: The new `DynamicImageFilter` instance.
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public init(_ identifier: String, filter: @escaping (Image) -> Image) {
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self.identifier = identifier
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self.filter = filter
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}
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}
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// MARK: - CompositeImageFilter
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/// The `CompositeImageFilter` protocol defines an additional `filters` property to support multiple composite filters.
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public protocol CompositeImageFilter: ImageFilter {
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/// The image filters to apply to the image in sequential order.
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var filters: [ImageFilter] { get }
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}
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public extension CompositeImageFilter {
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/// The unique idenitifier for any `CompositeImageFilter` type.
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var identifier: String {
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filters.map { $0.identifier }.joined(separator: "_")
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}
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/// The filter closure for any `CompositeImageFilter` type.
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var filter: (Image) -> Image {
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{ image in
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self.filters.reduce(image) { $1.filter($0) }
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}
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}
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}
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// MARK: - DynamicCompositeImageFilter
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/// The `DynamicCompositeImageFilter` class is a composite image filter based on a specified array of filters.
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public struct DynamicCompositeImageFilter: CompositeImageFilter {
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/// The image filters to apply to the image in sequential order.
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public let filters: [ImageFilter]
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/// Initializes the `DynamicCompositeImageFilter` instance with the given filters.
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///
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/// - parameter filters: The filters taking part in the composite image filter.
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///
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/// - returns: The new `DynamicCompositeImageFilter` instance.
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public init(_ filters: [ImageFilter]) {
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self.filters = filters
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}
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/// Initializes the `DynamicCompositeImageFilter` instance with the given filters.
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///
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/// - parameter filters: The filters taking part in the composite image filter.
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///
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/// - returns: The new `DynamicCompositeImageFilter` instance.
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public init(_ filters: ImageFilter...) {
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self.init(filters)
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}
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}
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#if os(iOS) || os(tvOS) || os(watchOS)
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// MARK: - Single Pass Image Filters (iOS, tvOS and watchOS only) -
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/// Scales an image to a specified size.
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public struct ScaledToSizeFilter: ImageFilter, Sizable {
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/// The size of the filter.
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public let size: CGSize
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/// Initializes the `ScaledToSizeFilter` instance with the given size.
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///
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/// - parameter size: The size.
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///
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/// - returns: The new `ScaledToSizeFilter` instance.
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public init(size: CGSize) {
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self.size = size
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}
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/// The filter closure used to create the modified representation of the given image.
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public var filter: (Image) -> Image {
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{ image in
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image.af.imageScaled(to: self.size)
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}
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}
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}
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// MARK: -
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/// Scales an image from the center while maintaining the aspect ratio to fit within a specified size.
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public struct AspectScaledToFitSizeFilter: ImageFilter, Sizable {
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/// The size of the filter.
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public let size: CGSize
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/// Initializes the `AspectScaledToFitSizeFilter` instance with the given size.
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///
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/// - parameter size: The size.
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///
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/// - returns: The new `AspectScaledToFitSizeFilter` instance.
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public init(size: CGSize) {
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self.size = size
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}
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/// The filter closure used to create the modified representation of the given image.
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public var filter: (Image) -> Image {
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{ image in
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image.af.imageAspectScaled(toFit: self.size)
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}
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}
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}
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// MARK: -
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/// Scales an image from the center while maintaining the aspect ratio to fill a specified size. Any pixels that fall
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/// outside the specified size are clipped.
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public struct AspectScaledToFillSizeFilter: ImageFilter, Sizable {
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/// The size of the filter.
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public let size: CGSize
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/// Initializes the `AspectScaledToFillSizeFilter` instance with the given size.
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///
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/// - parameter size: The size.
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///
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/// - returns: The new `AspectScaledToFillSizeFilter` instance.
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public init(size: CGSize) {
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self.size = size
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}
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/// The filter closure used to create the modified representation of the given image.
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public var filter: (Image) -> Image {
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{ image in
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image.af.imageAspectScaled(toFill: self.size)
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}
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}
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}
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// MARK: -
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/// Rounds the corners of an image to the specified radius.
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public struct RoundedCornersFilter: ImageFilter, Roundable {
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/// The radius of the filter.
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public let radius: CGFloat
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/// Whether to divide the radius by the image scale.
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public let divideRadiusByImageScale: Bool
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/// Initializes the `RoundedCornersFilter` instance with the given radius.
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///
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/// - parameter radius: The radius.
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/// - parameter divideRadiusByImageScale: Whether to divide the radius by the image scale. Set to `true` when the
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/// image has the same resolution for all screen scales such as @1x, @2x and
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/// @3x (i.e. single image from web server). Set to `false` for images loaded
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/// from an asset catalog with varying resolutions for each screen scale.
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/// `false` by default.
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///
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/// - returns: The new `RoundedCornersFilter` instance.
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public init(radius: CGFloat, divideRadiusByImageScale: Bool = false) {
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self.radius = radius
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self.divideRadiusByImageScale = divideRadiusByImageScale
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}
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/// The filter closure used to create the modified representation of the given image.
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public var filter: (Image) -> Image {
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{ image in
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image.af.imageRounded(withCornerRadius: self.radius,
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divideRadiusByImageScale: self.divideRadiusByImageScale)
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}
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}
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/// The unique idenitifier for an `ImageFilter` conforming to the `Roundable` protocol.
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public var identifier: String {
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let radius = Int64(self.radius.rounded())
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return "\(type(of: self))-radius:(\(radius))-divided:(\(divideRadiusByImageScale))"
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}
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}
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// MARK: -
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/// Rounds the corners of an image into a circle.
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public struct CircleFilter: ImageFilter {
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/// Initializes the `CircleFilter` instance.
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///
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/// - returns: The new `CircleFilter` instance.
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public init() {}
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/// The filter closure used to create the modified representation of the given image.
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public var filter: (Image) -> Image {
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{ image in
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image.af.imageRoundedIntoCircle()
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}
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}
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}
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// MARK: -
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#if os(iOS) || os(tvOS)
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/// The `CoreImageFilter` protocol defines `parameters`, `filterName` properties used by CoreImage.
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@available(iOS 9.0, *)
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public protocol CoreImageFilter: ImageFilter {
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/// The filter name of the CoreImage filter.
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var filterName: String { get }
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/// The image filter parameters passed to CoreImage.
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var parameters: [String: Any] { get }
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}
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@available(iOS 9.0, *)
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public extension ImageFilter where Self: CoreImageFilter {
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/// The filter closure used to create the modified representation of the given image.
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var filter: (Image) -> Image {
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{ image in
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image.af.imageFiltered(withCoreImageFilter: self.filterName, parameters: self.parameters) ?? image
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}
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}
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/// The unique idenitifier for an `ImageFilter` conforming to the `CoreImageFilter` protocol.
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var identifier: String { "\(type(of: self))-parameters:(\(parameters))" }
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}
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/// Blurs an image using a `CIGaussianBlur` filter with the specified blur radius.
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@available(iOS 9.0, *)
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public struct BlurFilter: ImageFilter, CoreImageFilter {
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/// The filter name.
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public let filterName = "CIGaussianBlur"
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/// The image filter parameters passed to CoreImage.
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public let parameters: [String: Any]
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/// Initializes the `BlurFilter` instance with the given blur radius.
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///
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/// - parameter blurRadius: The blur radius.
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///
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/// - returns: The new `BlurFilter` instance.
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public init(blurRadius: UInt = 10) {
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parameters = ["inputRadius": blurRadius]
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}
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}
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#endif
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// MARK: - Composite Image Filters (iOS, tvOS and watchOS only) -
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/// Scales an image to a specified size, then rounds the corners to the specified radius.
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public struct ScaledToSizeWithRoundedCornersFilter: CompositeImageFilter {
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/// Initializes the `ScaledToSizeWithRoundedCornersFilter` instance with the given size and radius.
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///
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/// - parameter size: The size.
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/// - parameter radius: The radius.
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/// - parameter divideRadiusByImageScale: Whether to divide the radius by the image scale. Set to `true` when the
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/// image has the same resolution for all screen scales such as @1x, @2x and
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/// @3x (i.e. single image from web server). Set to `false` for images loaded
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/// from an asset catalog with varying resolutions for each screen scale.
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/// `false` by default.
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///
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/// - returns: The new `ScaledToSizeWithRoundedCornersFilter` instance.
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public init(size: CGSize, radius: CGFloat, divideRadiusByImageScale: Bool = false) {
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filters = [ScaledToSizeFilter(size: size),
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RoundedCornersFilter(radius: radius, divideRadiusByImageScale: divideRadiusByImageScale)]
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}
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/// The image filters to apply to the image in sequential order.
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public let filters: [ImageFilter]
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}
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// MARK: -
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/// Scales an image from the center while maintaining the aspect ratio to fit within a specified size, then rounds the
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/// corners to the specified radius.
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public struct AspectScaledToFillSizeWithRoundedCornersFilter: CompositeImageFilter {
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/// Initializes the `AspectScaledToFillSizeWithRoundedCornersFilter` instance with the given size and radius.
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///
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/// - parameter size: The size.
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/// - parameter radius: The radius.
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/// - parameter divideRadiusByImageScale: Whether to divide the radius by the image scale. Set to `true` when the
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/// image has the same resolution for all screen scales such as @1x, @2x and
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/// @3x (i.e. single image from web server). Set to `false` for images loaded
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/// from an asset catalog with varying resolutions for each screen scale.
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/// `false` by default.
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///
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/// - returns: The new `AspectScaledToFillSizeWithRoundedCornersFilter` instance.
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public init(size: CGSize, radius: CGFloat, divideRadiusByImageScale: Bool = false) {
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filters = [AspectScaledToFillSizeFilter(size: size),
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RoundedCornersFilter(radius: radius, divideRadiusByImageScale: divideRadiusByImageScale)]
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}
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/// The image filters to apply to the image in sequential order.
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public let filters: [ImageFilter]
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}
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// MARK: -
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/// Scales an image to a specified size, then rounds the corners into a circle.
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public struct ScaledToSizeCircleFilter: CompositeImageFilter {
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/// Initializes the `ScaledToSizeCircleFilter` instance with the given size.
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///
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/// - parameter size: The size.
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///
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/// - returns: The new `ScaledToSizeCircleFilter` instance.
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public init(size: CGSize) {
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filters = [ScaledToSizeFilter(size: size), CircleFilter()]
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}
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/// The image filters to apply to the image in sequential order.
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public let filters: [ImageFilter]
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}
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// MARK: -
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/// Scales an image from the center while maintaining the aspect ratio to fit within a specified size, then rounds the
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/// corners into a circle.
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public struct AspectScaledToFillSizeCircleFilter: CompositeImageFilter {
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/// Initializes the `AspectScaledToFillSizeCircleFilter` instance with the given size.
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///
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/// - parameter size: The size.
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///
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/// - returns: The new `AspectScaledToFillSizeCircleFilter` instance.
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public init(size: CGSize) {
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filters = [AspectScaledToFillSizeFilter(size: size), CircleFilter()]
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}
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/// The image filters to apply to the image in sequential order.
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public let filters: [ImageFilter]
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}
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#endif
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