23 lines
1.1 KiB
Swift
Executable file
23 lines
1.1 KiB
Swift
Executable file
import Foundation
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let data = try! Data(contentsOf: URL(fileURLWithPath: "shot.bmp"))
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let pixOff = data.withUnsafeBytes { $0.load(fromByteOffset: 10, as: UInt32.self) }
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let w = Int(data.withUnsafeBytes { $0.load(fromByteOffset: 18, as: Int32.self) })
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let hRaw = Int(data.withUnsafeBytes { $0.load(fromByteOffset: 22, as: Int32.self) }); let h = abs(hRaw)
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let B = Int(data.withUnsafeBytes { $0.load(fromByteOffset: 28, as: UInt16.self) })/8
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let rowBytes = (B * w + 3) & ~3
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var cols: [Int] = Array(repeating: 0, count: w)
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for y in 365...400 {
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let rowStart = Int(pixOff) + (hRaw > 0 ? (h-1-y) : y) * rowBytes
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for x in 0..<w {
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let i = rowStart + x * B
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let b = Int(data[i]), g = Int(data[i+1]), r = Int(data[i+2])
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if b > 120 && b > r + 30 && b > g + 15 && r < 160 { cols[x] += 1 }
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}
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}
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var runs: [(Int,Int)] = []
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var s = -1
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for x in 0..<w {
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if cols[x] > 3 && s < 0 { s = x }
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if (cols[x] <= 3 || x == w-1) && s >= 0 { runs.append((s,x)); s = -1 }
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}
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for r in runs { print("blue run x=\(r.0)-\(r.1) width=\(r.1-r.0) center=\((r.0+r.1)/2)") }
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