104 lines
4.5 KiB
Swift
104 lines
4.5 KiB
Swift
//
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// ScreenDelegate.swift
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// FruitMachine
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//
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// Created by Christopher Rohl on 8/1/17.
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// Copyright © 2017 Christopher Rohl. All rights reserved.
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//
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import Cocoa
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extension AppleII {
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class ScreenDelegate: NSObject, CALayerDelegate {
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static let PIXEL_WIDTH = 280
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static let PIXEL_HEIGHT = 192
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static let CELLS_WIDTH = 40
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static let CELLS_HEIGHT = 24
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static let CELLS_COUNT = CELLS_WIDTH * CELLS_HEIGHT
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/* Pixel data stuff. */
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let bitmapInfo: CGBitmapInfo = [.byteOrder16Big, CGBitmapInfo(rawValue: CGImageAlphaInfo.noneSkipFirst.rawValue)]
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var pixels: CVPixelBuffer?
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let sourceRowBytes: Int
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let bufferWidth: Int
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let bufferHeight: Int
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var renderedImage: CGImage?
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var scanlineOffsets: [Int]
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override init() {
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_ = CVPixelBufferCreate(kCFAllocatorDefault, AppleII.ScreenDelegate.PIXEL_WIDTH, AppleII.ScreenDelegate.PIXEL_HEIGHT, OSType(k16BE555PixelFormat), nil, &pixels)
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sourceRowBytes = CVPixelBufferGetBytesPerRow(pixels!)
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bufferWidth = CVPixelBufferGetWidth(pixels!)
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bufferHeight = CVPixelBufferGetHeight(pixels!)
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renderedImage = nil
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scanlineOffsets = [Int]()
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for i in 0..<AppleII.ScreenDelegate.PIXEL_HEIGHT {
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scanlineOffsets.append(i * AppleII.ScreenDelegate.PIXEL_WIDTH)
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}
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}
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func putGlyph(buffer: UnsafeMutablePointer<BitmapPixelsBE555.PixelData>?, glyph: Glyph, pixelPosition: CGPoint) {
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//You better have locked the buffer before getting here...
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//Calculate the offset to reach the desired position.
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let baseOffset = scanlineOffsets[Int(pixelPosition.y)] + Int(pixelPosition.x)
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for charY in 0..<AppleII.A2CharacterGenerator.CHAR_HEIGHT {
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let offset = baseOffset + (AppleII.ScreenDelegate.PIXEL_WIDTH * charY)
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let glyphOffsetY = (charY * 8)
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for charX in 0..<7 {
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buffer![offset + 6 - charX] = glyph.pixels[glyphOffsetY + charX]
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}
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}
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}
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func getPixelOffset(charCellX: Int, charCellY: Int) -> CGPoint {
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return CGPoint(x: charCellX * 7, y: charCellY * 8)
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}
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func getPixelOffset(charCellIndex: Int) -> CGPoint {
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return getPixelOffset(charCellX: charCellIndex % AppleII.ScreenDelegate.CELLS_WIDTH, charCellY: charCellIndex / AppleII.ScreenDelegate.CELLS_WIDTH)
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}
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/* Draw the screen. */
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func draw(_ layer: CALayer, in ctx: CGContext) {
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CVPixelBufferLockBaseAddress(pixels!, CVPixelBufferLockFlags.readOnly)
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let pixelBase = CVPixelBufferGetBaseAddress(pixels!)
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let pixelRef = CGDataProvider(dataInfo: nil, data: pixelBase!, size: sourceRowBytes * bufferHeight, releaseData: releaseMaskImagePixelData)
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renderedImage = CGImage(width: AppleII.ScreenDelegate.PIXEL_WIDTH,
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height: AppleII.ScreenDelegate.PIXEL_HEIGHT,
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bitsPerComponent: Int(BitmapPixelsBE555.bitsPerComponent), //5
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bitsPerPixel: Int(BitmapPixelsBE555.bitsPerPixel), //16
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bytesPerRow: AppleII.ScreenDelegate.PIXEL_WIDTH * Int(MemoryLayout<BitmapPixelsBE555.PixelData>.size),
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space: BitmapPixelsBE555.colorSpace, //RGB
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bitmapInfo: bitmapInfo, //BE555
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provider: pixelRef!,
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decode: nil,
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shouldInterpolate: false,
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intent: CGColorRenderingIntent.defaultIntent)
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ctx.draw(renderedImage!, in: layer.bounds)
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CVPixelBufferUnlockBaseAddress(pixels!, CVPixelBufferLockFlags(rawValue: 0))
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}
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let releaseMaskImagePixelData: CGDataProviderReleaseDataCallback = { (info: UnsafeMutableRawPointer?, data: UnsafeRawPointer, size: Int) -> () in
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// https://developer.apple.com/reference/coregraphics/cgdataproviderreleasedatacallback
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// N.B. 'CGDataProviderRelease' is unavailable: Core Foundation objects are automatically memory managed
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return
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}
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}
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}
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