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https://github.com/status-im/react-native-camera.git
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78 lines
4.0 KiB
Mathematica
78 lines
4.0 KiB
Mathematica
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//
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// RNFaceDetectorUtils.m
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// RCTCamera
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//
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// Created by Joao Guilherme Daros Fidelis on 21/01/18.
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//
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#import "RNCameraUtils.h"
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#import "RNFaceDetectorUtils.h"
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#import "RNFaceDetectorPointTransformCalculator.h"
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NSString *const RNGMVDataOutputWidthKey = @"Width";
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NSString *const RNGMVDataOutputHeightKey = @"Height";
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@implementation RNFaceDetectorUtils
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+ (NSDictionary *)constantsToExport
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{
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return @{
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@"Mode" : @{
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@"fast" : @(RNFaceDetectionFastMode),
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@"accurate" : @(RNFaceDetectionAccurateMode)
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},
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@"Landmarks" : @{
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@"all" : @(RNFaceDetectAllLandmarks),
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@"none" : @(RNFaceDetectNoLandmarks)
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},
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@"Classifications" : @{
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@"all" : @(RNFaceRunAllClassifications),
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@"none" : @(RNFaceRunNoClassifications)
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}
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};
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}
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# pragma mark - GMVDataOutput transformations
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+ (CGAffineTransform)transformFromDeviceVideoOrientation:(AVCaptureVideoOrientation)deviceVideoOrientation toInterfaceVideoOrientation:(AVCaptureVideoOrientation)interfaceVideoOrientation videoWidth:(NSNumber *)width videoHeight:(NSNumber *)height
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{
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RNFaceDetectorPointTransformCalculator *calculator = [[RNFaceDetectorPointTransformCalculator alloc] initToTransformFromOrientation:deviceVideoOrientation toOrientation:interfaceVideoOrientation forVideoWidth:[width floatValue] andVideoHeight:[height floatValue]];
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return [calculator transform];
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}
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// Normally we would use `dataOutput.xScale`, `.yScale` and `.offset`.
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// Unfortunately, it turns out that using these attributes results in different results
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// on iPhone {6, 7} and iPhone 5S. On newer iPhones the transform works properly,
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// whereas on iPhone 5S the scale is too big (~0.7, while it should be ~0.4) and the offset
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// moves the face points away. This workaround (using screen + orientation + video resolution
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// to calculate proper scale) has been proven to work all three devices.
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+ (CGAffineTransform)transformFromDeviceOutput:(GMVDataOutput *)dataOutput withInterfaceOrientation:(AVCaptureVideoOrientation)interfaceVideoOrientation
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{
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UIScreen *mainScreen = [UIScreen mainScreen];
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BOOL interfaceIsLandscape = interfaceVideoOrientation == AVCaptureVideoOrientationLandscapeLeft || interfaceVideoOrientation == AVCaptureVideoOrientationLandscapeRight;
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CGFloat interfaceWidth = interfaceIsLandscape ? mainScreen.bounds.size.height : mainScreen.bounds.size.width;
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CGFloat interfaceHeight = interfaceIsLandscape ? mainScreen.bounds.size.width : mainScreen.bounds.size.height;
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CGFloat xScale = interfaceWidth / [(NSNumber *)dataOutput.videoSettings[RNGMVDataOutputHeightKey] floatValue];
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CGFloat yScale = interfaceHeight / [(NSNumber *)dataOutput.videoSettings[RNGMVDataOutputWidthKey] floatValue];
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CGAffineTransform dataOutputTransform = CGAffineTransformIdentity;
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dataOutputTransform = CGAffineTransformScale(dataOutputTransform, xScale, yScale);
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return dataOutputTransform;
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}
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+ (CGAffineTransform)transformFromDeviceOutput:(GMVDataOutput *)dataOutput toInterfaceVideoOrientation:(AVCaptureVideoOrientation)interfaceVideoOrientation
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{
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UIDeviceOrientation currentDeviceOrientation = [[UIDevice currentDevice] orientation];
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AVCaptureVideoOrientation deviceVideoOrientation = [RNCameraUtils videoOrientationForDeviceOrientation:currentDeviceOrientation];
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NSNumber *videoWidth = dataOutput.videoSettings[RNGMVDataOutputWidthKey];
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NSNumber *videoHeight = dataOutput.videoSettings[RNGMVDataOutputHeightKey];
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CGAffineTransform interfaceTransform = [self transformFromDeviceVideoOrientation:deviceVideoOrientation toInterfaceVideoOrientation:interfaceVideoOrientation videoWidth:videoWidth videoHeight:videoHeight];
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CGAffineTransform dataOutputTransform = [self transformFromDeviceOutput:dataOutput withInterfaceOrientation:interfaceVideoOrientation];
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return CGAffineTransformConcat(interfaceTransform, dataOutputTransform);
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}
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@end
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