94 lines
3.5 KiB
Objective-C
94 lines
3.5 KiB
Objective-C
//
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// SCManagedCaptureDeviceDefaultZoomHandler.m
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// Snapchat
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//
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// Created by Yu-Kuan Lai on 4/12/17.
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// Copyright © 2017 Snapchat, Inc. All rights reserved.
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//
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#import "SCManagedCaptureDeviceDefaultZoomHandler_Private.h"
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#import "SCCaptureResource.h"
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#import "SCManagedCaptureDevice+SCManagedCapturer.h"
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#import "SCManagedCapturer.h"
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#import "SCManagedCapturerLogging.h"
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#import "SCManagedCapturerStateBuilder.h"
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#import "SCMetalUtils.h"
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#import <SCFoundation/SCAssertWrapper.h>
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#import <SCFoundation/SCQueuePerformer.h>
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#import <SCFoundation/SCThreadHelpers.h>
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#import <SCFoundation/SCTraceODPCompatible.h>
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@implementation SCManagedCaptureDeviceDefaultZoomHandler
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- (instancetype)initWithCaptureResource:(SCCaptureResource *)captureResource
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{
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self = [super init];
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if (self) {
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_captureResource = captureResource;
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}
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return self;
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}
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- (void)setZoomFactor:(CGFloat)zoomFactor forDevice:(SCManagedCaptureDevice *)device immediately:(BOOL)immediately
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{
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[self _setZoomFactor:zoomFactor forManagedCaptureDevice:device];
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}
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- (void)softwareZoomWithDevice:(SCManagedCaptureDevice *)device
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{
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SCTraceODPCompatibleStart(2);
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SCAssert([_captureResource.queuePerformer isCurrentPerformer] ||
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[[SCQueuePerformer mainQueuePerformer] isCurrentPerformer],
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@"");
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SCAssert(device.softwareZoom, @"Only do software zoom for software zoom device");
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SC_GUARD_ELSE_RETURN(!SCDeviceSupportsMetal());
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float zoomFactor = device.zoomFactor;
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SCLogCapturerInfo(@"Adjusting software zoom factor to: %f", zoomFactor);
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AVCaptureVideoPreviewLayer *videoPreviewLayer = _captureResource.videoPreviewLayer;
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[[SCQueuePerformer mainQueuePerformer] perform:^{
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[CATransaction begin];
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[CATransaction setDisableActions:YES];
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// I end up need to change its superlayer transform to get the zoom effect
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videoPreviewLayer.superlayer.affineTransform = CGAffineTransformMakeScale(zoomFactor, zoomFactor);
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[CATransaction commit];
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}];
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}
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- (void)_setZoomFactor:(CGFloat)zoomFactor forManagedCaptureDevice:(SCManagedCaptureDevice *)device
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{
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SCTraceODPCompatibleStart(2);
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[_captureResource.queuePerformer perform:^{
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SCTraceStart();
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if (device) {
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SCLogCapturerInfo(@"Set zoom factor: %f -> %f", _captureResource.state.zoomFactor, zoomFactor);
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[device setZoomFactor:zoomFactor];
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BOOL zoomFactorChanged = NO;
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// If the device is our current device, send the notification, update the
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// state.
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if (device.isConnected && device == _captureResource.device) {
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if (device.softwareZoom) {
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[self softwareZoomWithDevice:device];
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}
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_captureResource.state = [[[SCManagedCapturerStateBuilder
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withManagedCapturerState:_captureResource.state] setZoomFactor:zoomFactor] build];
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zoomFactorChanged = YES;
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}
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SCManagedCapturerState *state = [_captureResource.state copy];
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runOnMainThreadAsynchronously(^{
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if (zoomFactorChanged) {
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[_captureResource.announcer managedCapturer:[SCManagedCapturer sharedInstance]
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didChangeState:state];
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[_captureResource.announcer managedCapturer:[SCManagedCapturer sharedInstance]
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didChangeZoomFactor:state];
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}
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});
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}
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}];
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}
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@end
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