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//
// REXPaintImage.swift
//
// Created by Steve Johnson on 1/7/18.
//
// Copyright (c) 2018, Steve Johnson
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this
// list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
// ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
import Foundation
// Requires Gzip package:
// https://github.com/1024jp/GzipSwift
import Gzip
public class REXPaintImage: CustomDebugStringConvertible {
public let version: Int32
public let layers: [[REXPaintCell]]
public let width: Int32
public let height: Int32
public init?(maybeGzippedData: Data) {
var data = maybeGzippedData
if data.isGzipped {
guard let decompressedData = try? data.gunzipped() else { return nil }
data = decompressedData
}
let ints: [Int32] = data.withUnsafeBytes {
Array(UnsafeBufferPointer<Int32>(start: $0, count: data.count/MemoryLayout<Int32>.size))
}
// Read the preamble
self.version = ints[0]
let layersCount = ints[1]
self.width = ints[2]
self.height = ints[3]
let cellsPerLayer = Int(self.width * self.height)
// Initialize layers array
var layers = [[REXPaintCell]]()
// w, h, (code + color) * w * h
let bytesPerCell = 10
let bytesPerLayer = 4 + 4 + (bytesPerCell * cellsPerLayer)
let bytesInPreamble = 8
for layerIndex in 0..<Int(layersCount) {
let byteStart = bytesInPreamble + layerIndex * bytesPerLayer
let cellByteStart = byteStart + 8 // w, h
var layerArr = [REXPaintCell](repeating: REXPaintCell.zero, count: Int(self.width * self.height))
for cellIndex in 0..<cellsPerLayer {
let cellByteIndex = data.index(cellByteStart + bytesPerCell * cellIndex, offsetBy: 0)
let cellData = data.subdata(in: cellByteIndex..<cellByteIndex.advanced(by: bytesPerCell))
let code: Int32 = cellData.subdata(in: 0..<4).withUnsafeBytes({
return Array(UnsafeBufferPointer<Int32>(start: $0, count: 1))[0]
})
let cellBytes = [UInt8](cellData)
layerArr[cellIndex] = REXPaintCell(
code: code,
foregroundColor: (cellBytes[4], cellBytes[5], cellBytes[6]),
backgroundColor: (cellBytes[7], cellBytes[8], cellBytes[9]))
}
layers.append(layerArr)
}
self.layers = layers
}
public func get(layer: Int, x: Int, y: Int) -> REXPaintCell {
return layers[layer][x * Int(self.height) + y]
}
public var debugDescription: String {
return "REXPaintImage(w=\(self.width), h=\(self.width), layers=\(self.layers.count))"
}
}
public struct REXPaintCell {
public let code: Int32
public let foregroundColor: (UInt8, UInt8, UInt8)
public let backgroundColor: (UInt8, UInt8, UInt8)
public static let zero = { return REXPaintCell(code: 0, foregroundColor: (0, 0, 0), backgroundColor: (0, 0, 0)) }()
public init(
code: Int32,
foregroundColor: (UInt8, UInt8, UInt8),
backgroundColor: (UInt8, UInt8, UInt8))
{
self.code = code
self.foregroundColor = foregroundColor
self.backgroundColor = backgroundColor
}
}
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