mirror of
https://github.com/OpenEmu/OpenEmu-Shaders.git
synced 2025-11-01 11:07:54 +00:00
Stuart Carnie
51 lines
2.6 KiB
Swift
51 lines
2.6 KiB
Swift
// Copyright (c) 2021, OpenEmu Team
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are met:
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above copyright
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// notice, this list of conditions and the following disclaimer in the
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// documentation and/or other materials provided with the distribution.
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// * Neither the name of the OpenEmu Team nor the
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// names of its contributors may be used to endorse or promote products
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// derived from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY OpenEmu Team ''AS IS'' AND ANY
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// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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// DISCLAIMED. IN NO EVENT SHALL OpenEmu Team BE LIABLE FOR ANY
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// DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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import Foundation
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import ImageIO
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extension CGContext {
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/// make creates a context using the dimensions and contents from the image identified by the URL.
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/// - Parameter url: The URL of the source image.
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/// - Returns: a new CGContext with dimensions and contents matching the source image.
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static func make(_ url: URL) -> CGContext? {
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guard
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let src = CGImageSourceCreateWithURL(url as CFURL, nil),
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let img = CGImageSourceCreateImageAtIndex(src, CGImageSourceGetPrimaryImageIndex(src), nil)
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else { return nil }
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guard let context = CGContext(data: nil,
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width: img.width, height: img.height,
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bitsPerComponent: 8, bytesPerRow: img.width * 4,
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space: CGColorSpace(name: CGColorSpace.sRGB)!,
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bitmapInfo: CGImageAlphaInfo.premultipliedLast.rawValue)
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else { return nil }
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context.interpolationQuality = .none
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context.draw(img, in: CGRect(x: 0, y: 0, width: img.width, height: img.height))
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return context
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}
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}
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