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从桌面工程复制而来,作为本仓库的 Xuxucheck/ 子目录。 为控制仓库体积做了两处删减: - 移除 Frameworks/opencv2.xcframework 下的两个 visionOS 切片 (xros-arm64、xros-arm64-simulator,合计约 106 MB),并同步删掉该 xcframework 内 Info.plist 里对应的两条 AvailableLibraries 记录, 只保留 ios-arm64 与 ios-arm64_x86_64-simulator。 - 移除全部 .DS_Store 与 xcuserdata/。 已用 xcodebuild 从本目录完整编译验证:BUILD SUCCEEDED, ProcessXCFramework 以 --platform ios 成功选中框架,产物含 3699 个 cv:: 符号 (OpenCV 确实链入),嵌入 framework 3 个,与移除无用 pod 之后的状态一致。 仓库约 206 MB,其中 OpenCV 203 MB、其余源码与依赖约 3 MB。
128 lines
5.5 KiB
Swift
128 lines
5.5 KiB
Swift
//
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// AVCaptureDevice+bestForBuiltInCamera.swift
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// https://github.com/twostraws/CodeScanner
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//
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// Created by Karol Bielski on 10/02/2024.
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// Copyright © 2024 Paul Hudson. All rights reserved.
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//
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#if os(iOS)
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import AVFoundation
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@available(macCatalyst 14.0, *)
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extension AVCaptureDevice {
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/// Returns best built in back camera for scanning QR codes zoomed for a given minimum code size.
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public static func zoomedCameraForQRCode(withMinimumCodeSize minimumCodeSize: Float = 20) -> AVCaptureDevice? {
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let captureDevice = AVCaptureDevice.DiscoverySession(
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deviceTypes: [.builtInWideAngleCamera],
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mediaType: .video,
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position: .back
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).devices.first ?? AVCaptureDevice.default(for: .video)
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if #available(iOS 15.0, *) {
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captureDevice?.setRecommendedZoomFactor(forMinimumCodeSize: minimumCodeSize)
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}
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return captureDevice
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}
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/// Sets recommended zoom factor for a given minimum code size.
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@available(iOS 15.0, *)
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func setRecommendedZoomFactor(forMinimumCodeSize minimumCodeSize: Float) {
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/*
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Optimize the user experience for scanning QR codes down to given size.
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When scanning a QR code of that size, the user may need to get closer than
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the camera's minimum focus distance to fill the rect of interest.
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To have the QR code both fill the rect and still be in focus, we may need to apply some zoom.
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*/
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let deviceMinimumFocusDistance = Float(minimumFocusDistance)
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guard deviceMinimumFocusDistance != -1 else { return }
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let deviceFieldOfView = activeFormat.videoFieldOfView
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let formatDimensions = CMVideoFormatDescriptionGetDimensions(activeFormat.formatDescription)
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let rectOfInterestWidth = Double(formatDimensions.height) / Double(formatDimensions.width)
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let minimumSubjectDistanceForCode = minimumSubjectDistanceForCode(
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fieldOfView: deviceFieldOfView,
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minimumCodeSize: minimumCodeSize,
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previewFillPercentage: Float(rectOfInterestWidth)
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)
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guard minimumSubjectDistanceForCode < deviceMinimumFocusDistance else { return }
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let zoomFactor = deviceMinimumFocusDistance / minimumSubjectDistanceForCode
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do {
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try lockForConfiguration()
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videoZoomFactor = CGFloat(zoomFactor)
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unlockForConfiguration()
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} catch {
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print("Could not lock for configuration: \(error)")
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}
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}
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private func minimumSubjectDistanceForCode(
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fieldOfView: Float,
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minimumCodeSize: Float,
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previewFillPercentage: Float
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) -> Float {
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/*
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Given the camera horizontal field of view, we can compute the distance (mm) to make a code
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of minimumCodeSize (mm) fill the previewFillPercentage.
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*/
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let radians = (fieldOfView / 2).radians
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let filledCodeSize = minimumCodeSize / previewFillPercentage
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return filledCodeSize / tan(radians)
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}
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}
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private extension Float {
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var radians: Float {
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self * Float.pi / 180
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}
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}
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#endif
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/*
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Part of this code is copied from Apple sample project "AVCamBarcode: Using AVFoundation to capture barcodes".
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IMPORTANT: This Apple software is supplied to you by Apple
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Inc. ("Apple") in consideration of your agreement to the following
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terms, and your use, installation, modification or redistribution of
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this Apple software constitutes acceptance of these terms. If you do
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not agree with these terms, please do not use, install, modify or
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redistribute this Apple software.
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In consideration of your agreement to abide by the following terms, and
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subject to these terms, Apple grants you a personal, non-exclusive
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license, under Apple's copyrights in this original Apple software (the
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"Apple Software"), to use, reproduce, modify and redistribute the Apple
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Software, with or without modifications, in source and/or binary forms;
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provided that if you redistribute the Apple Software in its entirety and
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without modifications, you must retain this notice and the following
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text and disclaimers in all such redistributions of the Apple Software.
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Neither the name, trademarks, service marks or logos of Apple Inc. may
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be used to endorse or promote products derived from the Apple Software
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without specific prior written permission from Apple. Except as
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expressly stated in this notice, no other rights or licenses, express or
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implied, are granted by Apple herein, including but not limited to any
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patent rights that may be infringed by your derivative works or by other
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works in which the Apple Software may be incorporated.
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The Apple Software is provided by Apple on an "AS IS" basis. APPLE
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MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION
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THE IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS
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FOR A PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND
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OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS.
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IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL
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OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION,
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MODIFICATION AND/OR DISTRIBUTION OF THE APPLE SOFTWARE, HOWEVER CAUSED
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AND WHETHER UNDER THEORY OF CONTRACT, TORT (INCLUDING NEGLIGENCE),
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STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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Copyright (C) 2016 Apple Inc. All Rights Reserved.
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*/
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