82 lines
1.9 KiB
Swift
82 lines
1.9 KiB
Swift
//
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// SkiaPreviewView.swift
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// VisionCamera
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//
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// Created by Marc Rousavy on 19.07.23.
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// Copyright © 2023 mrousavy. All rights reserved.
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//
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import Foundation
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// MARK: - SkiaPreviewLayer
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class SkiaPreviewLayer: CAMetalLayer {
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private var pixelRatio: CGFloat {
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return UIScreen.main.scale
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}
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init(device: MTLDevice) {
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super.init()
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framebufferOnly = true
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self.device = device
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isOpaque = false
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pixelFormat = .bgra8Unorm
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contentsScale = pixelRatio
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}
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@available(*, unavailable)
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required init?(coder _: NSCoder) {
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fatalError("init(coder:) has not been implemented")
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}
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func setSize(width: CGFloat, height: CGFloat) {
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frame = CGRect(x: 0, y: 0, width: width, height: height)
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drawableSize = CGSize(width: width * pixelRatio,
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height: height * pixelRatio)
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}
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}
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// MARK: - SkiaPreviewView
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class SkiaPreviewView: PreviewView {
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private let skiaRenderer: SkiaRenderer
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private let previewLayer: SkiaPreviewLayer
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private lazy var displayLink = SkiaPreviewDisplayLink(callback: { [weak self] _ in
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// Called everytime to render the screen - e.g. 60 FPS
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if let self = self {
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self.skiaRenderer.renderLatestFrame(to: self.previewLayer)
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}
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})
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init(frame: CGRect, skiaRenderer: SkiaRenderer) {
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self.skiaRenderer = skiaRenderer
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previewLayer = SkiaPreviewLayer(device: skiaRenderer.metalDevice)
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super.init(frame: frame)
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}
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deinit {
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self.displayLink.stop()
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}
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@available(*, unavailable)
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required init?(coder _: NSCoder) {
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fatalError("init(coder:) has not been implemented")
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}
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override func willMove(toSuperview newSuperview: UIView?) {
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if newSuperview != nil {
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layer.addSublayer(previewLayer)
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displayLink.start()
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} else {
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previewLayer.removeFromSuperlayer()
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displayLink.stop()
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}
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}
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override func layoutSubviews() {
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previewLayer.setSize(width: bounds.size.width,
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height: bounds.size.height)
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}
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}
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