Implement and test portrait beauty, face geometry and persistent tracking
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#import <Foundation/Foundation.h>
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#import <CoreImage/CoreImage.h>
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#import <Vision/Vision.h>
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#import <ImageIO/ImageIO.h>
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#import "PGFaceProcessor.h"
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// Injectable detections let geometry, selection and saved-frame behavior be
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// tested independently of the separate public-domain NASA portrait fixture.
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@interface PGFaceProcessor (TestDetection)
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- (NSArray<VNFaceObservation *> *)observationsInImage:(CIImage *)image settings:(PGBeautySettings)settings error:(NSError **)error;
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@end
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@interface PGFaceFixture : PGFaceProcessor
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@property (nonatomic, copy) NSArray<VNFaceObservation *> *detections;
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@property (nonatomic) NSUInteger detectionCount;
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@end
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@implementation PGFaceFixture
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- (NSArray<VNFaceObservation *> *)observationsInImage:(CIImage *)image settings:(PGBeautySettings)settings error:(NSError **)error {
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self.detectionCount++;
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return self.detections ?: @[];
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}
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@end
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static NSUInteger PGChecks = 0;
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static void Check(BOOL condition, NSString *description) {
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PGChecks++;
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if (!condition) { fprintf(stderr, "FAIL: %s\n", description.UTF8String); exit(1); }
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}
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static VNFaceObservation *Face(CGRect box) {
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return [VNFaceObservation faceObservationWithRequestRevision:VNDetectFaceLandmarksRequestRevision3 boundingBox:box roll:nil yaw:nil pitch:nil];
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}
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static NSData *Pixels(CIContext *context, CIImage *image) {
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CGRect bounds = image.extent;
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NSUInteger width = (NSUInteger)bounds.size.width, height = (NSUInteger)bounds.size.height;
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NSMutableData *data = [NSMutableData dataWithLength:width * height * 4];
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CGColorSpaceRef colorSpace = CGColorSpaceCreateWithName(kCGColorSpaceSRGB);
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[context render:image toBitmap:data.mutableBytes rowBytes:width * 4 bounds:bounds format:kCIFormatRGBA8 colorSpace:colorSpace];
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CGColorSpaceRelease(colorSpace);
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return data;
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}
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static unsigned char Channel(CIContext *context, CIImage *image, double x, double y, NSUInteger channel) {
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unsigned char pixel[4] = {0};
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CGColorSpaceRef space = CGColorSpaceCreateWithName(kCGColorSpaceSRGB);
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[context render:image toBitmap:pixel rowBytes:4 bounds:CGRectMake(x, y, 1, 1) format:kCIFormatRGBA8 colorSpace:space];
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CGColorSpaceRelease(space);
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return pixel[channel];
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}
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static CIImage *Gradient(void) {
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NSMutableData *data = [NSMutableData dataWithLength:128 * 128 * 4];
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unsigned char *p = data.mutableBytes;
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for (NSUInteger y = 0; y < 128; y++) for (NSUInteger x = 0; x < 128; x++) {
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NSUInteger index = 4 * (y * 128 + x);
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p[index] = x * 2; p[index + 1] = y * 2;
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p[index + 2] = ((x / 8 + y / 8) % 2) * 220 + 15; p[index + 3] = 255;
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}
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CGColorSpaceRef space = CGColorSpaceCreateWithName(kCGColorSpaceSRGB);
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CIImage *image = [CIImage imageWithBitmapData:data bytesPerRow:128 * 4 size:CGSizeMake(128, 128) format:kCIFormatRGBA8 colorSpace:space];
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CGColorSpaceRelease(space);
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return image;
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}
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int main(int argc, const char *argv[]) {
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@autoreleasepool {
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CIContext *context = [CIContext contextWithOptions:@{kCIContextCacheIntermediates:@NO}];
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CIImage *image = Gradient();
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PGBeautySettings settings = PGBeautyDefaults();
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PGFaceFixture *processor = [[PGFaceFixture alloc] init];
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VNFaceObservation *left = Face(CGRectMake(0.08, 0.18, 0.36, 0.62));
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VNFaceObservation *right = Face(CGRectMake(0.64, 0.23, 0.28, 0.53));
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processor.detections = @[left, right];
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NSError *error = nil;
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PGFaceFrame *frame = [processor processImage:image settings:settings time:kCMTimeZero error:&error];
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Check(frame != nil && error == nil, @"kernels initialize and process finite input");
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Check(frame.faces.count == 2, @"multi-face mode retains both detections");
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Check([Pixels(context, frame.image) isEqualToData:Pixels(context, image)], @"zero geometry controls preserve original pixels");
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Check(Channel(context, frame.skinMask, 1, 1, 0) == 0, @"skin mask excludes background");
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Check(Channel(context, frame.skinMask, 18, 54, 0) > 150, @"skin mask covers cheek");
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Check(Channel(context, frame.eyeMask, 23, 71, 0) > 40, @"eye mask includes estimated eye region");
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Check(Channel(context, frame.teethMask, 33, 42, 0) > 20, @"teeth mask includes inner mouth region");
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PGBeautySettings unprotected = settings; unprotected.featureProtection = 0;
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PGFaceFrame *withoutProtection = [processor processImage:image settings:unprotected time:kCMTimeZero error:&error];
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Check(Channel(context, frame.skinMask, 23, 71, 0) < Channel(context, withoutProtection.skinMask, 23, 71, 0), @"feature protection removes eye from skin smoothing");
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settings.singleFace = 1; settings.selectionX = 0.78; settings.selectionY = 0.45;
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frame = [processor processImage:image settings:settings time:kCMTimeZero error:&error];
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Check(frame.faces.count == 1 && frame.faces.firstObject.boundingBox.origin.x > 0.5, @"single-face selection uses normalized bottom-left point");
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settings.selectionX = 0.25; settings.selectionY = 0.5;
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settings.trackingEnabled = 1; settings.faceJumpGuardRange = 0.5;
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CMTime first = CMTimeMake(1, 24), second = CMTimeMake(2, 24);
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Check([processor analyzeImage:image settings:settings time:first error:&error], @"analysis stores first precise frame");
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processor.detections = @[right];
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Check([processor analyzeImage:image settings:settings time:second error:&error], @"analysis stores guarded missing-target frame");
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NSUInteger detectionsBeforeRender = processor.detectionCount;
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PGFaceFrame *secondFrame = [processor processImage:image settings:settings time:second error:&error];
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PGFaceFrame *firstFrame = [processor processImage:image settings:settings time:CMTimeMake(2, 48) error:&error];
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Check(secondFrame.faces.count == 0, @"jump guard rejects distant replacement face");
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Check(firstFrame.faces.count == 1 && firstFrame.faces.firstObject.boundingBox.origin.x < 0.5, @"reverse render retrieves exact earlier frame");
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Check(processor.detectionCount == detectionsBeforeRender, @"saved frame lookup does not re-run detection");
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Check(Channel(context, secondFrame.skinMask, 33, 43, 0) == 0, @"rejected target has black mask");
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Check([processor analyzeImage:image settings:settings time:CMTimeMake(3, 24) error:&error], @"analysis continues after a lost target");
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Check([processor processImage:image settings:settings time:CMTimeMake(3, 24) error:&error].faces.count == 0, @"jump guard keeps last valid identity across a missed frame");
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Check([processor processImage:image settings:settings time:CMTimeMake(7, 48) error:&error].faces.count == 0, @"unsaved frame detects current image with deterministic analyzed identity guard");
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Check([processor analyzeImage:image settings:settings time:CMTimeMake(3, 1) error:&error], @"analysis tolerates a seek across lost detections");
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Check([processor processImage:image settings:settings time:CMTimeMake(3, 1) error:&error].faces.count == 0, @"jump guard does not silently reacquire a stranger after a long gap");
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NSData *archive = [processor trackingDataForTarget:0];
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Check(archive.length > 0, @"tracking is persistable");
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PGFaceFixture *restored = [[PGFaceFixture alloc] init];
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[restored setTrackingData:archive forTarget:0];
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PGFaceFrame *restoredFrame = [restored processImage:image settings:settings time:first error:&error];
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Check(restoredFrame.faces.count == 1 && restored.detectionCount == 0, @"restored target serves exact frame without detections");
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Check([Pixels(context, firstFrame.skinMask) isEqualToData:Pixels(context, restoredFrame.skinMask)], @"restored geometry reproduces feature masks");
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Check([restored trackingDataForTarget:1] == nil && [restored trackingDataForTarget:2] == nil, @"three target stores are independent");
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[restored setTrackingData:archive forTarget:2];
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settings.targetIndex = 2;
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Check([restored processImage:image settings:settings time:first error:&error].faces.count == 1, @"third target stores and restores separately");
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settings.targetIndex = 0;
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[restored processImage:image settings:settings time:CMTimeMake(4, 24) error:&error];
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Check(restored.detectionCount == 1, @"missing exact time uses stateless detection");
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[restored setTrackingData:[@"invalid archive" dataUsingEncoding:NSUTF8StringEncoding] forTarget:0];
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Check([restored trackingDataForTarget:0] == nil, @"invalid archive is rejected without exception");
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[restored resetTracking];
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Check([restored trackingDataForTarget:2] == nil, @"reset clears all targets");
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error = nil;
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Check(![restored analyzeImage:image settings:settings time:kCMTimeInvalid error:&error] && error != nil, @"analysis rejects invalid times");
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processor.detections = @[Face(CGRectMake(0.2, 0.15, 0.6, 0.7))];
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settings = PGBeautyDefaults();
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NSData *base = Pixels(context, image);
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NSString *names[] = {@"thin", @"big eyes", @"short", @"narrow", @"chin", @"V", @"jaw", @"cheekbone", @"small head"};
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for (NSUInteger i = 0; i < 9; i++) {
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PGBeautySettings changed = settings;
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float *controls[] = {&changed.faceThin, &changed.faceBigEye, &changed.faceShort, &changed.faceNarrow, &changed.faceChin, &changed.faceV, &changed.faceJaw, &changed.faceCheekbone, &changed.faceSmallHead};
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*controls[i] = 1;
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PGFaceFrame *warped = [processor processImage:image settings:changed time:kCMTimeZero error:&error];
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Check(warped != nil && ![Pixels(context, warped.image) isEqualToData:base], [@"geometry control changes pixels: " stringByAppendingString:names[i]]);
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Check(CGRectEqualToRect(warped.image.extent, image.extent), @"warp preserves image extent");
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}
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settings.faceShort = 0.8;
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NSData *positive = Pixels(context, [processor processImage:image settings:settings time:kCMTimeZero error:&error].image);
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settings.faceShort = -0.8;
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Check(![positive isEqualToData:Pixels(context, [processor processImage:image settings:settings time:kCMTimeZero error:&error].image)], @"signed short-face control has distinct directions");
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settings = PGBeautyDefaults(); settings.showFaceBoxes = 1;
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frame = [processor processImage:image settings:settings time:kCMTimeZero error:&error];
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Check(Channel(context, frame.overlayImage, 26, 64, 3) > 0, @"face outlines provide separate final-composite overlay");
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CIImage *offset = [image imageByApplyingTransform:CGAffineTransformMakeTranslation(30, 40)];
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frame = [processor processImage:offset settings:settings time:kCMTimeZero error:&error];
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Check(CGRectEqualToRect(frame.image.extent, offset.extent), @"nonzero image origins survive masks and warp");
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PGFaceProcessor *vision = [[PGFaceProcessor alloc] init];
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CIImage *blank = [[CIImage imageWithColor:CIColor.grayColor] imageByCroppingToRect:CGRectMake(0, 0, 128, 128)];
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frame = [vision processImage:blank settings:PGBeautyDefaults() time:kCMTimeZero error:&error];
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Check(frame != nil && frame.faces.count == 0, @"real Vision request accepts blank image without false faces");
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NSString *fixturePath = argc > 1 ? @(argv[1]) : @"tests/fixtures/astronaut.png";
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CIImage *portrait = [CIImage imageWithContentsOfURL:[NSURL fileURLWithPath:fixturePath]];
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Check(portrait != nil, @"public-domain NASA portrait fixture opens");
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settings = PGBeautyDefaults();
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PGFaceFrame *portraitFrame = [vision processImage:portrait settings:settings time:kCMTimeZero error:&error];
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Check(portraitFrame.faces.count > 0, @"real Vision detects astronaut portrait");
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Check(CGRectEqualToRect(portraitFrame.skinMask.extent, portrait.extent) && CGRectEqualToRect(portraitFrame.teethMask.extent, portrait.extent) && CGRectEqualToRect(portraitFrame.eyeMask.extent, portrait.extent), @"all real portrait masks have finite input extent");
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VNFaceObservation *actual = portraitFrame.faces.firstObject;
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Check(actual.landmarks.allPoints.pointCount > 30 && actual.landmarks.leftEye.pointCount > 3, @"real Vision returns detailed facial landmarks");
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const CGPoint *eyePoints = actual.landmarks.leftEye.normalizedPoints;
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CGPoint eye = CGPointZero;
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for (NSUInteger i = 0; i < actual.landmarks.leftEye.pointCount; i++) { eye.x += eyePoints[i].x; eye.y += eyePoints[i].y; }
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eye.x /= actual.landmarks.leftEye.pointCount; eye.y /= actual.landmarks.leftEye.pointCount;
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CGRect actualBox = actual.boundingBox;
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eye.x = (actualBox.origin.x + eye.x * actualBox.size.width) * portrait.extent.size.width;
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eye.y = (actualBox.origin.y + eye.y * actualBox.size.height) * portrait.extent.size.height;
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Check(Channel(context, portraitFrame.eyeMask, floor(eye.x), floor(eye.y), 0) > 80, @"landmark-derived eye mask lands on real eye");
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Check(Channel(context, portraitFrame.skinMask, floor(eye.x), floor(eye.y), 0) < 100, @"real facial feature mask excludes eye from smoothing");
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settings.faceThin = 0.4; settings.faceBigEye = 0.25; settings.faceChin = 0.15; settings.faceSmallHead = 0.15;
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settings.faceSmallHeadRange = 0.6; settings.showFaceBoxes = 1;
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PGFaceFrame *beautified = [vision processImage:portrait settings:settings time:kCMTimeZero error:&error];
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Check(beautified != nil && ![Pixels(context, beautified.image) isEqualToData:Pixels(context, portrait)], @"real face geometry changes portrait pixels");
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Check(abs((int)Channel(context, beautified.image, 5, 300, 0) - (int)Channel(context, portrait, 5, 300, 0)) <= 1, @"face warp preserves distant portrait background pixels");
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settings.trackingEnabled = 1; settings.singleFace = 1;
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settings.selectionX = CGRectGetMidX(actualBox); settings.selectionY = CGRectGetMidY(actualBox);
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Check([vision analyzeImage:portrait settings:settings time:first error:&error], @"real landmarks analyze into persistent geometry");
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NSData *realArchive = [vision trackingDataForTarget:0];
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PGFaceFrame *analyzed = [vision processImage:portrait settings:settings time:first error:&error];
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PGFaceProcessor *realRestored = [[PGFaceProcessor alloc] init];
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[realRestored setTrackingData:realArchive forTarget:0];
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PGFaceFrame *restoredPortrait = [realRestored processImage:portrait settings:settings time:first error:&error];
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Check(restoredPortrait.faces.count == analyzed.faces.count && [Pixels(context, restoredPortrait.image) isEqualToData:Pixels(context, analyzed.image)], @"real face warp survives persistence byte-for-byte");
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Check([Pixels(context, restoredPortrait.eyeMask) isEqualToData:Pixels(context, analyzed.eyeMask)], @"real landmark eye mask survives persistence byte-for-byte");
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Check([Pixels(context, restoredPortrait.teethMask) isEqualToData:Pixels(context, analyzed.teethMask)], @"real landmark teeth mask survives persistence byte-for-byte");
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if (argc > 2) {
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CGFloat width = portrait.extent.size.width, height = portrait.extent.size.height;
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CIImage *after = [[beautified.overlayImage imageByCompositingOverImage:beautified.image] imageByCroppingToRect:portrait.extent];
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CGColorSpaceRef space = CGColorSpaceCreateWithName(kCGColorSpaceSRGB);
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CGContextRef canvas = CGBitmapContextCreate(NULL, width * 3, height, 8, width * 3 * 4, space, (CGBitmapInfo)kCGImageAlphaPremultipliedLast);
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NSArray *panels = @[portrait, after, portraitFrame.skinMask];
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for (NSUInteger panel = 0; panel < panels.count; panel++) {
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CGImageRef content = [context createCGImage:panels[panel] fromRect:portrait.extent];
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CGContextDrawImage(canvas, CGRectMake(panel * width, 0, width, height), content);
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CGImageRelease(content);
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}
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CGImageRef preview = CGBitmapContextCreateImage(canvas);
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CGImageDestinationRef destination = CGImageDestinationCreateWithURL((__bridge CFURLRef)[NSURL fileURLWithPath:@(argv[2])], CFSTR("public.png"), 1, NULL);
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Check(destination != NULL && preview != NULL, @"portrait comparison preview allocates");
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CGImageDestinationAddImage(destination, preview, NULL);
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Check(CGImageDestinationFinalize(destination), @"portrait comparison preview writes PNG");
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CFRelease(destination); CGImageRelease(preview);
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CGContextRelease(canvas); CGColorSpaceRelease(space);
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}
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printf("Face processing: %lu checks passed\n", (unsigned long)PGChecks);
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}
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return 0;
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}
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