89 lines
3.0 KiB
Swift
89 lines
3.0 KiB
Swift
//
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// GraphicsContext.swift
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// Kingfisher
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//
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// Created by taras on 19/04/2021.
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//
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// Copyright (c) 2021 Wei Wang <onevcat@gmail.com>
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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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#if canImport(AppKit) && !targetEnvironment(macCatalyst)
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import AppKit
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#endif
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#if canImport(UIKit)
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import UIKit
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#endif
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enum GraphicsContext {
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static func begin(size: CGSize, scale: CGFloat) {
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#if os(macOS)
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NSGraphicsContext.saveGraphicsState()
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#else
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UIGraphicsBeginImageContextWithOptions(size, false, scale)
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#endif
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}
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static func current(size: CGSize, scale: CGFloat, inverting: Bool, cgImage: CGImage?) -> CGContext? {
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#if os(macOS)
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guard let rep = NSBitmapImageRep(
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bitmapDataPlanes: nil,
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pixelsWide: Int(size.width),
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pixelsHigh: Int(size.height),
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bitsPerSample: cgImage?.bitsPerComponent ?? 8,
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samplesPerPixel: 4,
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hasAlpha: true,
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isPlanar: false,
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colorSpaceName: .calibratedRGB,
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bytesPerRow: 0,
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bitsPerPixel: 0) else
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{
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assertionFailure("[Kingfisher] Image representation cannot be created.")
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return nil
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}
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rep.size = size
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guard let context = NSGraphicsContext(bitmapImageRep: rep) else {
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assertionFailure("[Kingfisher] Image context cannot be created.")
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return nil
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}
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NSGraphicsContext.current = context
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return context.cgContext
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#else
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guard let context = UIGraphicsGetCurrentContext() else {
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return nil
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}
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if inverting { // If drawing a CGImage, we need to make context flipped.
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context.scaleBy(x: 1.0, y: -1.0)
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context.translateBy(x: 0, y: -size.height)
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}
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return context
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#endif
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}
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static func end() {
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#if os(macOS)
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NSGraphicsContext.restoreGraphicsState()
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#else
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UIGraphicsEndImageContext()
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#endif
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}
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}
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