FruitMachine-Swift/FruitMachine/AppleI/AppleIBitmapDisplay.swift
2017-08-01 02:02:49 -04:00

97 lines
4.0 KiB
Swift

//
// AppleScreenViewDelegate.swift
// FruitMachine
//
// Created by Christopher Rohl on 7/27/17.
// Copyright © 2017 Christopher Rohl. All rights reserved.
//
import Cocoa
class AppleIBitmapDisplay: NSObject, CALayerDelegate {
static let PIXEL_WIDTH = 320
static let PIXEL_HEIGHT = 192
/* Pixel data stuff. */
let bitmapInfo: CGBitmapInfo = [.byteOrder16Big, CGBitmapInfo(rawValue: CGImageAlphaInfo.noneSkipFirst.rawValue)]
var pixels: CVPixelBuffer?
let sourceRowBytes: Int
let bufferWidth: Int
let bufferHeight: Int
var renderedImage: CGImage?
var scanlineOffsets: [Int]
override init() {
_ = CVPixelBufferCreate(kCFAllocatorDefault, AppleIBitmapDisplay.PIXEL_WIDTH, AppleIBitmapDisplay.PIXEL_HEIGHT, OSType(k16BE555PixelFormat), nil, &pixels)
sourceRowBytes = CVPixelBufferGetBytesPerRow(pixels!)
bufferWidth = CVPixelBufferGetWidth(pixels!)
bufferHeight = CVPixelBufferGetHeight(pixels!)
renderedImage = nil
scanlineOffsets = [Int]()
for i in 0..<AppleIBitmapDisplay.PIXEL_HEIGHT {
scanlineOffsets.append(i * AppleIBitmapDisplay.PIXEL_WIDTH)
}
}
func putGlyph(buffer: UnsafeMutablePointer<BitmapPixelsBE555.PixelData>?, glyph: Glyph, pixelPosition: CGPoint) {
//You better have locked the buffer before getting here...
//Calculate the offset to reach the desired position.
let baseOffset = scanlineOffsets[Int(pixelPosition.y)] + Int(pixelPosition.x)
for charY in 0..<AppleI.A1CharacterGenerator.CHAR_HEIGHT {
let offset = baseOffset + AppleIBitmapDisplay.PIXEL_WIDTH * charY
let glyphOffsetY = (charY * 8)
for charX in 0..<8 {
buffer![offset + 7 - charX] = glyph.pixels[glyphOffsetY + charX]
}
}
}
func getPixelOffset(charCellX: Int, charCellY: Int) -> CGPoint {
return CGPoint(x: charCellX * 8, y: charCellY * 8)
}
func getPixelOffset(charCellIndex: Int) -> CGPoint {
return getPixelOffset(charCellX: charCellIndex % AppleI.Terminal.CELLS_WIDTH, charCellY: charCellIndex / AppleI.Terminal.CELLS_WIDTH)
}
/* Draw the screen. */
func draw(_ layer: CALayer, in ctx: CGContext) {
CVPixelBufferLockBaseAddress(pixels!, CVPixelBufferLockFlags.readOnly)
let pixelBase = CVPixelBufferGetBaseAddress(pixels!)
let pixelRef = CGDataProvider(dataInfo: nil, data: pixelBase!, size: sourceRowBytes * bufferHeight, releaseData: releaseMaskImagePixelData)
renderedImage = CGImage(width: AppleIBitmapDisplay.PIXEL_WIDTH,
height: AppleIBitmapDisplay.PIXEL_HEIGHT,
bitsPerComponent: Int(BitmapPixelsBE555.bitsPerComponent), //5
bitsPerPixel: Int(BitmapPixelsBE555.bitsPerPixel), //16
bytesPerRow: AppleIBitmapDisplay.PIXEL_WIDTH * Int(MemoryLayout<BitmapPixelsBE555.PixelData>.size),
space: BitmapPixelsBE555.colorSpace, //RGB
bitmapInfo: bitmapInfo, //BE555
provider: pixelRef!,
decode: nil,
shouldInterpolate: false,
intent: CGColorRenderingIntent.defaultIntent)
ctx.draw(renderedImage!, in: layer.bounds)
CVPixelBufferUnlockBaseAddress(pixels!, CVPixelBufferLockFlags(rawValue: 0))
}
let releaseMaskImagePixelData: CGDataProviderReleaseDataCallback = { (info: UnsafeMutableRawPointer?, data: UnsafeRawPointer, size: Int) -> () in
// https://developer.apple.com/reference/coregraphics/cgdataproviderreleasedatacallback
// N.B. 'CGDataProviderRelease' is unavailable: Core Foundation objects are automatically memory managed
return
}
}