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switched over to drawing into a CVPixelBuffer

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This commit is contained in:
Luigi Thirty 2017-07-31 00:44:43 -04:00
parent 16c100c565
commit cb5a4bca62
2 changed files with 54 additions and 10 deletions
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48
FruitMachine/AppleI/AppleIBitmapDisplay.swift
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@ -13,11 +13,27 @@ class AppleIBitmapDisplay: NSObject, CALayerDelegate {
static let PIXEL_HEIGHT = 192
/* Pixel data stuff. */
let bitmapInfo: CGBitmapInfo = CGBitmapInfo(rawValue: CGImageAlphaInfo.premultipliedFirst.rawValue)
let bitmapInfo: CGBitmapInfo = [.byteOrder32Big, CGBitmapInfo(rawValue: CGImageAlphaInfo.noneSkipFirst.rawValue)]
var rgbPixels = [BitmapPixels.PixelData](repeating: BitmapPixels.ColorBlack, count: AppleIBitmapDisplay.PIXEL_WIDTH*AppleIBitmapDisplay.PIXEL_HEIGHT)
var pixels: CVPixelBuffer?
let sourceRowBytes: Int
let bufferWidth: Int
let bufferHeight: Int
override init() {
_ = CVPixelBufferCreate(kCFAllocatorDefault, AppleIBitmapDisplay.PIXEL_WIDTH, AppleIBitmapDisplay.PIXEL_HEIGHT, OSType(k32ARGBPixelFormat), nil, &pixels)
sourceRowBytes = CVPixelBufferGetBytesPerRow(pixels!)
bufferWidth = CVPixelBufferGetWidth(pixels!)
bufferHeight = CVPixelBufferGetHeight(pixels!)
}
func putCharacterPixels(charPixels: [UInt8], pixelPosition: CGPoint) {
CVPixelBufferLockBaseAddress(pixels!, CVPixelBufferLockFlags(rawValue: 0))
let pixelBase = CVPixelBufferGetBaseAddress(pixels!)
let buf = pixelBase?.assumingMemoryBound(to: BitmapPixelsARGB32.PixelData.self)
//Calculate the offset to reach the desired position.
let baseOffset = (Int(pixelPosition.y) * AppleIBitmapDisplay.PIXEL_WIDTH) + Int(pixelPosition.x)
@ -25,9 +41,11 @@ class AppleIBitmapDisplay: NSObject, CALayerDelegate {
let offsetY = AppleIBitmapDisplay.PIXEL_WIDTH * charY
for charX in 0..<8 {
rgbPixels[baseOffset + offsetY + 7 - charX] = (charPixels[charY] & UInt8(1 << charX)) > 0 ? BitmapPixels.ColorWhite : BitmapPixels.ColorBlack
buf![baseOffset + offsetY + 7 - charX] = (charPixels[charY] & UInt8(1 << charX)) > 0 ? BitmapPixelsARGB32.ARGBWhite : BitmapPixelsARGB32.ARGBBlack
}
}
CVPixelBufferUnlockBaseAddress(pixels!, CVPixelBufferLockFlags(rawValue: 0))
}
func getPixelOffset(charCellX: Int, charCellY: Int) -> CGPoint {
@ -42,21 +60,31 @@ class AppleIBitmapDisplay: NSObject, CALayerDelegate {
func draw(_ layer: CALayer, in ctx: CGContext) {
let bounds = layer.bounds
let pixelProvider = CGDataProvider(data: NSData(bytes: &rgbPixels, length: rgbPixels.count * MemoryLayout<BitmapPixels.PixelData>.size))
CVPixelBufferLockBaseAddress(pixels!, CVPixelBufferLockFlags.readOnly)
let pixelBase = CVPixelBufferGetBaseAddress(pixels!)
let pixelRef = CGDataProvider(dataInfo: nil, data: pixelBase!, size: sourceRowBytes * bufferHeight, releaseData: releaseMaskImagePixelData)
let renderedImage = CGImage(width: AppleIBitmapDisplay.PIXEL_WIDTH,
height: AppleIBitmapDisplay.PIXEL_HEIGHT,
bitsPerComponent: Int(BitmapPixels.bitsPerComponent),
bitsPerPixel: Int(BitmapPixels.bitsPerPixel),
bytesPerRow: AppleIBitmapDisplay.PIXEL_WIDTH * Int(MemoryLayout<BitmapPixels.PixelData>.size),
space: BitmapPixels.colorSpace,
bitmapInfo: bitmapInfo,
provider: pixelProvider!,
bitsPerComponent: Int(BitmapPixelsARGB32.bitsPerComponent), //8
bitsPerPixel: Int(BitmapPixelsARGB32.bitsPerPixel), //32
bytesPerRow: AppleIBitmapDisplay.PIXEL_WIDTH * Int(MemoryLayout<BitmapPixelsARGB32.PixelData>.size),
space: BitmapPixelsARGB32.colorSpace, //RGB
bitmapInfo: bitmapInfo, //ARGB32
provider: pixelRef!,
decode: nil,
shouldInterpolate: false,
intent: CGColorRenderingIntent.defaultIntent)
ctx.draw(renderedImage!, in: 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
}
}

16
FruitMachine/AppleI/Video/BitmapPixels.swift
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@ -21,3 +21,19 @@ class BitmapPixels: NSObject {
static let ColorBlack = PixelData(data: 0b11000000)
static let ColorWhite = PixelData(data: 0b11111111)
}
class BitmapPixelsARGB32 : NSObject {
struct PixelData {
var a: UInt8 = 255
var r: UInt8 = 0
var g: UInt8 = 0
var b: UInt8 = 0
}
static let bitsPerComponent: UInt8 = 8
static let bitsPerPixel: UInt = 32
static let colorSpace = CGColorSpaceCreateDeviceRGB()
static let ARGBWhite = PixelData(a: 255, r: 200, g: 200, b: 200)
static let ARGBBlack = PixelData(a: 255, r: 0, g: 0, b: 0)
}