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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,62 @@ | ||
| // | ||
| // NSImage+extensions.swift | ||
| // SwitchKey | ||
| // | ||
| // Created by Jinyu Li on 2019/05/10. | ||
| // Copyright © 2019 Jinyu Li. All rights reserved. | ||
| // | ||
|
|
||
| import Cocoa | ||
|
|
||
| extension NSImage { | ||
| // A dumb method: | ||
| // go over the pixels, and check the color range. | ||
| // an image can be safely templated if its color range is limited. | ||
| // luckily, our image is small, and the check is done once for each new icon. | ||
| func canTemplate() -> Bool { | ||
| guard let cgContext = CGContext( | ||
| data: nil, | ||
| width: Int(size.width), | ||
| height: Int(size.height), | ||
| bitsPerComponent: 8, | ||
| bytesPerRow: 0, | ||
| space: CGColorSpaceCreateDeviceRGB(), | ||
| bitmapInfo: CGImageAlphaInfo.premultipliedLast.rawValue | ||
| ) else { | ||
| return false | ||
| } | ||
|
|
||
| let nsContext = NSGraphicsContext(cgContext: cgContext, flipped: false) | ||
| NSGraphicsContext.current = nsContext | ||
| draw(in: NSMakeRect(0, 0, size.width, size.height)) | ||
|
|
||
| guard let pixel = cgContext.data else { | ||
| return false; | ||
| } | ||
|
|
||
| let width = cgContext.width; | ||
| var rmin:UInt32 = 255, rmax:UInt32 = 0 | ||
| var gmin:UInt32 = 255, gmax:UInt32 = 0 | ||
| var bmin:UInt32 = 255, bmax:UInt32 = 0 | ||
| for y in 0 ... cgContext.height { | ||
| for x in 0 ... width { | ||
| let px = pixel.load(fromByteOffset: (y * width + x) * 4, as: UInt32.self) | ||
| let r = (px & 0x000000ff) >> 0 | ||
| let g = (px & 0x0000ff00) >> 8 | ||
| let b = (px & 0x00ff0000) >> 16 | ||
| rmin = min(r, rmin) | ||
| rmax = max(r, rmax) | ||
| gmin = min(g, rmin) | ||
| gmax = max(g, rmax) | ||
| bmin = min(b, rmin) | ||
| bmax = max(b, rmax) | ||
| } | ||
| } | ||
|
|
||
| NSGraphicsContext.current = nil | ||
|
|
||
| let isTemplate = (abs(Int(rmax)-Int(rmin)) + abs(Int(gmax)-Int(gmin)) + abs(Int(bmax)-Int(bmin))) <= 9 | ||
|
|
||
| return isTemplate | ||
| } | ||
| } |