132 lines
4.7 KiB
Objective-C
132 lines
4.7 KiB
Objective-C
//
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// SCManagedCaptureDeviceAutoFocusHandler.m
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// Snapchat
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//
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// Created by Jiyang Zhu on 3/7/18.
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// Copyright © 2018 Snapchat, Inc. All rights reserved.
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//
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#import "SCManagedCaptureDeviceAutoFocusHandler.h"
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#import "AVCaptureDevice+ConfigurationLock.h"
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#import <SCFoundation/SCTrace.h>
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#import <SCFoundation/SCTraceODPCompatible.h>
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@import CoreGraphics;
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@interface SCManagedCaptureDeviceAutoFocusHandler ()
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@property (nonatomic, assign) CGPoint focusPointOfInterest;
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@property (nonatomic, strong) AVCaptureDevice *device;
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@property (nonatomic, assign) BOOL isContinuousAutofocus;
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@property (nonatomic, assign) BOOL isFocusLock;
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@end
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@implementation SCManagedCaptureDeviceAutoFocusHandler
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- (instancetype)initWithDevice:(AVCaptureDevice *)device pointOfInterest:(CGPoint)pointOfInterest
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{
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if (self = [super init]) {
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_device = device;
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_focusPointOfInterest = pointOfInterest;
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_isContinuousAutofocus = YES;
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_isFocusLock = NO;
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}
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return self;
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}
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- (CGPoint)getFocusPointOfInterest
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{
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return self.focusPointOfInterest;
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}
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// called when user taps on a point on screen, to re-adjust camera focus onto that tapped spot.
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// this re-adjustment is always necessary, regardless of scenarios (recording video, taking photo, etc),
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// therefore we don't have to check self.isFocusLock in this method.
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- (void)setAutofocusPointOfInterest:(CGPoint)pointOfInterest
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{
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SCTraceODPCompatibleStart(2);
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SC_GUARD_ELSE_RETURN(!CGPointEqualToPoint(pointOfInterest, self.focusPointOfInterest) || self.isContinuousAutofocus)
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// Do the setup immediately if the focus lock is off.
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if ([self.device isFocusModeSupported:AVCaptureFocusModeAutoFocus] &&
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[self.device isFocusPointOfInterestSupported]) {
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[self.device runTask:@"set autofocus"
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withLockedConfiguration:^() {
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// Set focus point before changing focus mode
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// Be noticed that order does matter
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self.device.focusPointOfInterest = pointOfInterest;
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self.device.focusMode = AVCaptureFocusModeAutoFocus;
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}];
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}
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self.focusPointOfInterest = pointOfInterest;
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self.isContinuousAutofocus = NO;
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}
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- (void)continuousAutofocus
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{
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SCTraceODPCompatibleStart(2);
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SC_GUARD_ELSE_RETURN(!self.isContinuousAutofocus);
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if (!self.isFocusLock) {
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// Do the setup immediately if the focus lock is off.
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if ([self.device isFocusModeSupported:AVCaptureFocusModeContinuousAutoFocus] &&
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[self.device isFocusPointOfInterestSupported]) {
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[self.device runTask:@"set continuous autofocus"
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withLockedConfiguration:^() {
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// Set focus point before changing focus mode
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// Be noticed that order does matter
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self.device.focusPointOfInterest = CGPointMake(0.5, 0.5);
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self.device.focusMode = AVCaptureFocusModeContinuousAutoFocus;
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}];
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}
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}
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self.focusPointOfInterest = CGPointMake(0.5, 0.5);
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self.isContinuousAutofocus = YES;
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}
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- (void)setFocusLock:(BOOL)focusLock
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{
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SCTraceODPCompatibleStart(2);
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SC_GUARD_ELSE_RETURN(self.isFocusLock != focusLock);
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// This is the old lock, we only do focus lock on back camera
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if (focusLock) {
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if ([self.device isFocusModeSupported:AVCaptureFocusModeLocked]) {
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[self.device runTask:@"set focus lock on"
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withLockedConfiguration:^() {
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self.device.focusMode = AVCaptureFocusModeLocked;
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}];
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}
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} else {
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// Restore to previous autofocus configurations
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if ([self.device isFocusModeSupported:(self.isContinuousAutofocus ? AVCaptureFocusModeContinuousAutoFocus
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: AVCaptureFocusModeAutoFocus)] &&
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[self.device isFocusPointOfInterestSupported]) {
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[self.device runTask:@"set focus lock on"
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withLockedConfiguration:^() {
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self.device.focusPointOfInterest = self.focusPointOfInterest;
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self.device.focusMode = self.isContinuousAutofocus ? AVCaptureFocusModeContinuousAutoFocus
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: AVCaptureFocusModeAutoFocus;
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}];
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}
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}
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self.isFocusLock = focusLock;
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}
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- (void)setSmoothFocus:(BOOL)smoothFocus
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{
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SCTraceODPCompatibleStart(2);
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SC_GUARD_ELSE_RETURN(smoothFocus != self.device.smoothAutoFocusEnabled);
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[self.device runTask:@"set smooth autofocus"
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withLockedConfiguration:^() {
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[self.device setSmoothAutoFocusEnabled:smoothFocus];
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}];
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}
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- (void)setVisible:(BOOL)visible
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{
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}
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@end
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