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Pods/Kingfisher/Sources/Image/GraphicsContext.swift

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