Use explicit canvas-to-object conversion for native OSC events

beatygril/beatygril/Plugin/PGFaceSelectOSC.m

@@ -16,8 +16,20 @@
 - (instancetype)initWithAPIManager:(id<PROAPIAccessing>)api {
     if((self=[super init])) _apiManager=api; return self;
 }
-- (FxDrawingCoordinates)drawingCoordinates {return kFxDrawingCoordinates_OBJECT;}
+- (FxDrawingCoordinates)drawingCoordinates {return kFxDrawingCoordinates_CANVAS;}
 - (id<FxOnScreenControlAPI_v4>)oscAPI {return [_apiManager apiForProtocol:@protocol(FxOnScreenControlAPI_v4)];}
+- (BOOL)objectPointFromCanvasX:(double)x y:(double)y objectX:(double *)objectX objectY:(double *)objectY {
+    id<FxOnScreenControlAPI_v4> api=[self oscAPI];
+    if(!api || !objectX || !objectY || !isfinite(x) || !isfinite(y)) return NO;
+    // Request CANVAS events explicitly, then let the host invert its current
+    // zoom, pan and object transform. The conversion API has no success result;
+    // untouched or nonfinite outputs must never become a parameter write.
+    double nx=NAN,ny=NAN;
+    [api convertPointFromSpace:kFxDrawingCoordinates_CANVAS fromX:x fromY:y
+                      toSpace:kFxDrawingCoordinates_OBJECT toX:&nx toY:&ny];
+    if(!isfinite(nx) || !isfinite(ny)) return NO;
+    *objectX=nx;*objectY=ny;return YES;
+}
 - (BOOL)selectionEnabledAtTime:(CMTime)time {
     BOOL selected=NO;id<FxParameterRetrievalAPI_v6> api=[_apiManager apiForProtocol:@protocol(FxParameterRetrievalAPI_v6)];
     return api && [api getBoolValue:&selected fromParameter:PGSingleFace atTime:time] && selected;
@@ -64,7 +76,9 @@
 }
 - (void)hitTestOSCAtMousePositionX:(double)x mousePositionY:(double)y activePart:(NSInteger *)part atTime:(CMTime)time {
     if(!part) return;*part=0;
-    if(isfinite(x)&&isfinite(y)&&x>=0&&x<=1&&y>=0&&y<=1&&[self selectionEnabledAtTime:time]&&[self oscAPI]) *part=1;
+    double nx=NAN,ny=NAN;
+    if([self selectionEnabledAtTime:time] && [self objectPointFromCanvasX:x y:y objectX:&nx objectY:&ny] &&
+       nx>=0 && nx<=1 && ny>=0 && ny<=1) *part=1;
 }
 - (BOOL)pointWrite:(id<FxParameterSettingAPI_v5>)setter x:(double)x y:(double)y time:(CMTime)time {
     return setter && isfinite(x) && isfinite(y) && [setter setXValue:x YValue:y toParameter:PGSelection atTime:time];
@@ -126,23 +140,28 @@
 }
 - (void)mouseDownAtPositionX:(double)x positionY:(double)y activePart:(NSInteger)part modifiers:(FxModifierKeys)keys forceUpdate:(BOOL *)update atTime:(CMTime)time {
     if(update) *update=NO;
-    if(part!=1 || !isfinite(x) || !isfinite(y) || ![self selectionEnabledAtTime:time]) return;
+    double nx=NAN,ny=NAN;
-    if(![self oscAPI]) return;
+    if(part!=1 || ![self selectionEnabledAtTime:time] ||
+       ![self objectPointFromCanvasX:x y:y objectX:&nx objectY:&ny] || nx<0 || nx>1 || ny<0 || ny>1) return;
     id<FxUndoAPI> undo=[_apiManager apiForProtocol:@protocol(FxUndoAPI)];
     if(_undoOpen) [undo endUndoGroup];
     _undoOpen=[undo startUndoGroup:@"选择人脸"];
-    BOOL changed=NO;[self setSelectionX:x y:y time:time update:&changed];
+    BOOL changed=NO;[self setSelectionX:nx y:ny time:time update:&changed];
     _dragging=changed;
     if(!changed && _undoOpen) {[undo endUndoGroup];_undoOpen=NO;}
     if(update) *update=changed;
 }
 - (void)mouseDraggedAtPositionX:(double)x positionY:(double)y activePart:(NSInteger)part modifiers:(FxModifierKeys)keys forceUpdate:(BOOL *)update atTime:(CMTime)time {
     if(update) *update=NO;
-    if(_dragging && part==1 && [self selectionEnabledAtTime:time]) [self setSelectionX:x y:y time:time update:update];
+    double nx=NAN,ny=NAN;
+    if(_dragging && part==1 && [self selectionEnabledAtTime:time] &&
+       [self objectPointFromCanvasX:x y:y objectX:&nx objectY:&ny]) [self setSelectionX:nx y:ny time:time update:update];
 }
 - (void)mouseUpAtPositionX:(double)x positionY:(double)y activePart:(NSInteger)part modifiers:(FxModifierKeys)keys forceUpdate:(BOOL *)update atTime:(CMTime)time {
     if(update) *update=NO;
-    if(_dragging && part==1 && [self selectionEnabledAtTime:time]) [self setSelectionX:x y:y time:time update:update];
+    double nx=NAN,ny=NAN;
+    if(_dragging && part==1 && [self selectionEnabledAtTime:time] &&
+       [self objectPointFromCanvasX:x y:y objectX:&nx objectY:&ny]) [self setSelectionX:nx y:ny time:time update:update];
     _dragging=NO;
     if(_undoOpen) {id<FxUndoAPI> undo=[_apiManager apiForProtocol:@protocol(FxUndoAPI)];[undo endUndoGroup];_undoOpen=NO;}
 }

tests/osc_tests.m

@@ -14,15 +14,18 @@
 @property BOOL enabled, rejectRead, rejectPoint, rejectWrite, rejectUndo;
 @property BOOL disableOSC, disableParams, disableSetting, disableUndo,pixelSetter;
 @property BOOL corruptReadback;
+@property BOOL rejectConversion,nonfiniteConversion,partialConversion;
 @property CGRect bounds;
+@property CGAffineTransform objectToCanvas;
 @property double x,y,backing;
 @property NSUInteger writes,undoStarts,undoEnds;
 @property double lastX,lastY,lastConvertX,lastConvertY;
-@property NSUInteger objectBoundsReads;
+@property NSUInteger objectBoundsReads,canvasToObjectCalls,objectToCanvasCalls;
+@property FxDrawingCoordinates lastConvertFrom,lastConvertTo;
 @property CMTime lastTime;
 @end
 @implementation PGOSCAPI
-- (instancetype)init {if((self=[super init])){_enabled=YES;_bounds=CGRectMake(-100,-50,200,100);_x=.25;_y=.75;_backing=1;}return self;}
+- (instancetype)init {if((self=[super init])){_enabled=YES;_bounds=CGRectMake(-100,-50,200,100);_x=.25;_y=.75;_backing=1;_objectToCanvas=CGAffineTransformMakeScale(320,240);}return self;}
 - (id)apiForProtocol:(Protocol *)protocol {
     NSString *name=NSStringFromProtocol(protocol);
     if([name isEqual:@"FxOnScreenControlAPI_v4"])return _disableOSC?nil:self;
@@ -48,8 +51,16 @@
 - (CGRect)objectBounds {_objectBoundsReads++;return _bounds;}
 - (double)backingScaleFactor {return _backing;}
 - (void)convertPointFromSpace:(FxDrawingCoordinates)from fromX:(double)x fromY:(double)y toSpace:(FxDrawingCoordinates)to toX:(double *)tx toY:(double *)ty {
-    // Match the SDK contract: OBJECT inputs are normalized; CANVAS is pixels.
+    _lastConvertFrom=from;_lastConvertTo=to;_lastConvertX=x;_lastConvertY=y;
-    _lastConvertX=x;_lastConvertY=y;*tx=x*320;*ty=y*240;
+    CGPoint point=CGPointMake(NAN,NAN);
+    if(from==kFxDrawingCoordinates_OBJECT && to==kFxDrawingCoordinates_CANVAS) {
+        _objectToCanvasCalls++;point=CGPointApplyAffineTransform(CGPointMake(x,y),_objectToCanvas);
+    } else if(from==kFxDrawingCoordinates_CANVAS && to==kFxDrawingCoordinates_OBJECT) {
+        _canvasToObjectCalls++;point=CGPointApplyAffineTransform(CGPointMake(x,y),CGAffineTransformInvert(_objectToCanvas));
+    }
+    if(_rejectConversion)return; // A void host API can leave outputs untouched.
+    if(_nonfiniteConversion)point=CGPointMake(INFINITY,NAN);
+    *tx=point.x;if(!_partialConversion)*ty=point.y;
 }
 - (BOOL)startUndoGroup:(NSString *)name {_undoStarts++;return !_rejectUndo;}
 - (BOOL)endUndoGroup {_undoEnds++;return YES;}
@@ -81,7 +92,7 @@ int main(int argc,const char **argv) {@autoreleasepool {
     Check([osc conformsToProtocol:@protocol(FxOnScreenControl_v4)],@"OSC class conforms to the real FxPlug v4 protocol");
     NSArray *required=@[@"drawingCoordinates",@"drawOSCWithWidth:height:activePart:destinationImage:atTime:",@"hitTestOSCAtMousePositionX:mousePositionY:activePart:atTime:",@"mouseDownAtPositionX:positionY:activePart:modifiers:forceUpdate:atTime:",@"mouseDraggedAtPositionX:positionY:activePart:modifiers:forceUpdate:atTime:",@"mouseUpAtPositionX:positionY:activePart:modifiers:forceUpdate:atTime:",@"keyDownAtPositionX:positionY:keyPressed:modifiers:forceUpdate:didHandle:atTime:",@"keyUpAtPositionX:positionY:keyPressed:modifiers:forceUpdate:didHandle:atTime:"];
     for(NSString *selector in required)Check([osc respondsToSelector:NSSelectorFromString(selector)],[NSString stringWithFormat:@"Required callback exists: %@",selector]);
-    Check(osc.drawingCoordinates==kFxDrawingCoordinates_OBJECT,@"Mouse callbacks use declared object coordinates");
+    Check(osc.drawingCoordinates==kFxDrawingCoordinates_CANVAS,@"Mouse callbacks explicitly request CANVAS coordinates");
     NSDictionary *info=argc>1 ? [NSDictionary dictionaryWithContentsOfFile:[NSString stringWithUTF8String:argv[1]]] : nil;
     NSArray *entries=info[@"ProPlugPlugInList"];NSDictionary *control=nil;NSMutableArray *filters=[NSMutableArray new];NSMutableSet *ids=[NSMutableSet new];BOOL unique=YES;
     for(NSDictionary *entry in entries){if([ids containsObject:entry[@"uuid"]])unique=NO;[ids addObject:entry[@"uuid"]];if([entry[@"protocolNames"] containsObject:@"FxOnScreenControl"])control=entry;if([entry[@"protocolNames"] containsObject:@"FxFilter"])[filters addObject:entry];}
@@ -90,18 +101,18 @@ int main(int argc,const char **argv) {@autoreleasepool {
     Check([control[@"supportedPlugins"] isEqual:@[filters.firstObject[@"uuid"]]],@"Dedicated OSC links to the released filter UUID");
     api.enabled=NO;[osc hitTestOSCAtMousePositionX:0 mousePositionY:0 activePart:&part atTime:time];Check(part==0,@"Disabled selection does not claim mouse events");
     [osc mouseDownAtPositionX:0 positionY:0 activePart:1 modifiers:0 forceUpdate:&update atTime:time];Check(!update && api.writes==0 && api.undoStarts==0,@"Disabled mouse-down writes nothing and opens no undo group");
-    api.enabled=YES;[osc hitTestOSCAtMousePositionX:0 mousePositionY:0 activePart:&part atTime:time];Check(part==1,@"Enabled selection accepts a finite normalized object point");
+    api.enabled=YES;[osc hitTestOSCAtMousePositionX:80 mousePositionY:180 activePart:&part atTime:time];Check(part==1,@"Enabled selection accepts a canvas point inside the converted source");
     [osc hitTestOSCAtMousePositionX:1000 mousePositionY:0 activePart:&part atTime:time];Check(part==0,@"Outside-object hit test is empty");
     [osc hitTestOSCAtMousePositionX:NAN mousePositionY:0 activePart:&part atTime:time];Check(part==0,@"Nonfinite hit coordinates are rejected");
     [osc hitTestOSCAtMousePositionX:0 mousePositionY:0 activePart:NULL atTime:time];Check(YES,@"Null hit-test output is safe");
     [osc mouseDownAtPositionX:0 positionY:0 activePart:0 modifiers:0 forceUpdate:&update atTime:time];Check(!update && api.writes==0,@"Inactive part does not start selection");
     update=YES;[osc mouseUpAtPositionX:0 positionY:0 activePart:1 modifiers:0 forceUpdate:&update atTime:time];Check(!update && api.undoEnds==0,@"Mouse-up without mouse-down leaves undo balanced");
-    [osc mouseDownAtPositionX:.25 positionY:.75 activePart:1 modifiers:0 forceUpdate:&update atTime:time];Check(update && fabs(api.lastX-.25)<1e-8 && fabs(api.lastY-.75)<1e-8,@"OBJECT mouse-down writes normalized point coordinates directly");
+    [osc mouseDownAtPositionX:80 positionY:180 activePart:1 modifiers:0 forceUpdate:&update atTime:time];Check(update && fabs(api.lastX-.25)<1e-8 && fabs(api.lastY-.75)<1e-8,@"CANVAS mouse-down converts to normalized point parameter coordinates");
     Check(CMTimeCompare(api.lastTime,time)==0 && api.undoStarts==1,@"Selection writes use callback time and open one undo group");
-    [osc mouseDraggedAtPositionX:500 positionY:-500 activePart:1 modifiers:0 forceUpdate:&update atTime:time];Check(update && api.lastX==1 && api.lastY==0,@"Dragging clamps normalized selection to the source");
+    [osc mouseDraggedAtPositionX:500 positionY:-500 activePart:1 modifiers:0 forceUpdate:&update atTime:time];Check(update && api.lastX==1 && api.lastY==0,@"Dragging clamps the converted normalized point to the source");
     [osc mouseUpAtPositionX:0 positionY:0 activePart:1 modifiers:0 forceUpdate:&update atTime:time];Check(update && api.undoEnds==1,@"Gesture completes its matching undo group");
     NSUInteger writes=api.writes;[osc mouseDraggedAtPositionX:0 positionY:0 activePart:1 modifiers:0 forceUpdate:&update atTime:time];Check(!update && api.writes==writes,@"Stray drag after release writes nothing");
-    api.bounds=CGRectMake(0,0,NAN,100);[osc hitTestOSCAtMousePositionX:.5 mousePositionY:.5 activePart:&part atTime:time];Check(part==1,@"Normalized hit testing does not depend on document pixel bounds");
+    api.bounds=CGRectMake(0,0,NAN,100);[osc hitTestOSCAtMousePositionX:160 mousePositionY:120 activePart:&part atTime:time];Check(part==1,@"Converted hit testing does not depend on document pixel bounds");
     update=YES;[osc mouseDownAtPositionX:NAN positionY:0 activePart:1 modifiers:0 forceUpdate:&update atTime:time];Check(!update && api.writes==writes,@"Nonfinite event initializes forceUpdate and avoids parameter writes");api.bounds=CGRectMake(-100,-50,200,100);
     api.rejectWrite=YES;[osc mouseDownAtPositionX:0 positionY:0 activePart:1 modifiers:0 forceUpdate:&update atTime:time];Check(!update && api.undoStarts==api.undoEnds,@"Rejected parameter write closes the opened undo group");api.rejectWrite=NO;
     api.rejectUndo=YES;NSUInteger ends=api.undoEnds;[osc mouseDownAtPositionX:0 positionY:0 activePart:1 modifiers:0 forceUpdate:&update atTime:time];[osc mouseUpAtPositionX:0 positionY:0 activePart:1 modifiers:0 forceUpdate:&update atTime:time];Check(api.undoEnds==ends,@"Failed undo start is never paired with an invalid end");api.rejectUndo=NO;
@@ -125,25 +136,99 @@ int main(int argc,const char **argv) {@autoreleasepool {
     Check(api.objectBoundsReads==1,@"Drawing reads object bounds once for diagnostics and never uses them to scale the normalized point");
     api.x=NAN;[osc drawOSCWithWidth:1920 height:1080 activePart:0 destinationImage:tile atTime:time];Check(AlphaAt(tile,80,180)<.01,@"Nonfinite stored selection does not create invalid drawing filters");
     api.x=.5;api.y=.5;
-    [osc mouseDownAtPositionX:.8 positionY:.3 activePart:1 modifiers:0 forceUpdate:&update atTime:time];
+    [osc mouseDownAtPositionX:256 positionY:72 activePart:1 modifiers:0 forceUpdate:&update atTime:time];
-    [osc mouseUpAtPositionX:.8 positionY:.3 activePart:1 modifiers:0 forceUpdate:&update atTime:time];
+    [osc mouseUpAtPositionX:256 positionY:72 activePart:1 modifiers:0 forceUpdate:&update atTime:time];
     [osc drawOSCWithWidth:1921 height:1080 activePart:0 destinationImage:tile atTime:time];
     Check(fabs(api.x-.8)<1e-8 && fabs(api.y-.3)<1e-8 && AlphaAt(tile,256,72)>.9,@"Click writes normalized selection and redraws the handle at that point");
     PGOSCAPI *motion=[PGOSCAPI new];motion.pixelSetter=YES;motion.bounds=CGRectMake(-1920,-1080,3840,2160);
+    motion.objectToCanvas=CGAffineTransformMake(160,0,0,120,40,30);
     PGFaceSelectOSC *motionOSC=[[PGFaceSelectOSC alloc] initWithAPIManager:motion];
-    [motionOSC mouseDownAtPositionX:.8 positionY:.3 activePart:1 modifiers:0 forceUpdate:&update atTime:time];
+    [motionOSC mouseDownAtPositionX:168 positionY:66 activePart:1 modifiers:0 forceUpdate:&update atTime:time];
     Check(update && fabs(motion.x-.8)<1e-5 && fabs(motion.y-.3)<1e-5,@"Motion pixel-setter bridge is detected by verified parameter readback");
     Check(motion.writes==2 && fabs(motion.lastX-1152)<1e-5 && fabs(motion.lastY+432)<1e-5,@"Detected bridge receives the centered pixel inverse transform");
     NSUInteger beforeCached=motion.writes;
-    [motionOSC mouseDraggedAtPositionX:.7 positionY:.4 activePart:1 modifiers:0 forceUpdate:&update atTime:time];
+    [motionOSC mouseDraggedAtPositionX:152 positionY:78 activePart:1 modifiers:0 forceUpdate:&update atTime:time];
     Check(update && motion.writes==beforeCached+1 && fabs(motion.x-.7)<1e-5 && fabs(motion.y-.4)<1e-5,@"Pixel-setter mode is cached only on the same OSC instance");
-    [motionOSC mouseUpAtPositionX:.7 positionY:.4 activePart:1 modifiers:0 forceUpdate:&update atTime:time];
+    [motionOSC mouseUpAtPositionX:152 positionY:78 activePart:1 modifiers:0 forceUpdate:&update atTime:time];
     [motionOSC drawOSCWithWidth:3840 height:2160 activePart:0 destinationImage:tile atTime:time];
-    Check(AlphaAt(tile,224,96)>.9,@"Motion-compatible setter and normalized drawing round-trip to the same visible point");
+    Check(AlphaAt(tile,152,78)>.9,@"Motion-compatible setter and drawing round-trip through zoom and nonzero canvas translation");
     Check(motion.undoStarts==1 && motion.undoEnds==1,@"Calibration writes remain in one balanced undo gesture");
     PGOSCAPI *bad=[PGOSCAPI new];bad.corruptReadback=YES;
     PGFaceSelectOSC *badOSC=[[PGFaceSelectOSC alloc] initWithAPIManager:bad];
-    [badOSC mouseDownAtPositionX:.8 positionY:.3 activePart:1 modifiers:0 forceUpdate:&update atTime:time];
+    [badOSC mouseDownAtPositionX:256 positionY:72 activePart:1 modifiers:0 forceUpdate:&update atTime:time];
     Check(!update && bad.undoStarts==bad.undoEnds,@"Unrecognized readback response is reported as failure with balanced undo");
+
+    // Each fixture describes a host projection independent of effect dimensions:
+    // reduced view with padding, magnified/panned view, and a shifted canvas.
+    const CGAffineTransform transforms[]={
+        CGAffineTransformMake(160,0,0,120,40,30),
+        CGAffineTransformMake(640,0,0,480,-160,-120),
+        CGAffineTransformMake(192,0,0,144,96,72)};
+    const CGPoint normalizedPoints[]={CGPointMake(.75,.25),CGPointMake(.625,.375),CGPointMake(.25,.75)};
+    const CGPoint canvasPoints[]={CGPointMake(160,60),CGPointMake(240,60),CGPointMake(144,180)};
+    for(NSUInteger i=0;i<3;i++) {
+        PGOSCAPI *projected=[PGOSCAPI new];projected.objectToCanvas=transforms[i];
+        PGFaceSelectOSC *projectedOSC=[[PGFaceSelectOSC alloc] initWithAPIManager:projected];
+        CGPoint n=normalizedPoints[i],c=canvasPoints[i];
+        [projectedOSC hitTestOSCAtMousePositionX:c.x mousePositionY:c.y activePart:&part atTime:time];
+        Check(part==1,[NSString stringWithFormat:@"Projection %lu claims a visible source point",(unsigned long)i]);
+        Check(projected.lastConvertFrom==kFxDrawingCoordinates_CANVAS && projected.lastConvertTo==kFxDrawingCoordinates_OBJECT,@"Hit test explicitly requests the inverse host conversion");
+        [projectedOSC mouseDownAtPositionX:c.x positionY:c.y activePart:part modifiers:0 forceUpdate:&update atTime:time];
+        Check(update && fabs(projected.x-n.x)<1e-8 && fabs(projected.y-n.y)<1e-8,@"Projected click writes the expected normalized parameter");
+        [projectedOSC mouseUpAtPositionX:c.x positionY:c.y activePart:part modifiers:0 forceUpdate:&update atTime:time];
+        Check(update && projected.undoStarts==1 && projected.undoEnds==1,@"Projected mouse-up converts and closes one undo gesture");
+        [projectedOSC drawOSCWithWidth:3840 height:2160 activePart:0 destinationImage:tile atTime:time];
+        Check(AlphaAt(tile,(int)c.x,(int)c.y)>.9,@"Projected click, parameter and rendered handle share the same canvas position");
+        Check(projected.lastConvertFrom==kFxDrawingCoordinates_OBJECT && projected.lastConvertTo==kFxDrawingCoordinates_CANVAS,@"Draw explicitly requests the forward host conversion");
+        Check(projected.canvasToObjectCalls==3 && projected.objectToCanvasCalls==1,@"Hit, down, up and draw each use the live host conversion");
+    }
+    PGOSCAPI *panned=[PGOSCAPI new];panned.objectToCanvas=transforms[0];
+    PGFaceSelectOSC *pannedOSC=[[PGFaceSelectOSC alloc] initWithAPIManager:panned];
+    [pannedOSC hitTestOSCAtMousePositionX:20 mousePositionY:90 activePart:&part atTime:time];
+    Check(part==0,@"Canvas pixels inside the surface but outside a shifted source do not hit");
+    [pannedOSC mouseDownAtPositionX:20 positionY:90 activePart:1 modifiers:0 forceUpdate:&update atTime:time];
+    Check(!update && panned.writes==0 && panned.undoStarts==0,@"Outside-source mouse-down is rejected even with a stale active part");
+    [pannedOSC mouseDownAtPositionX:120 positionY:90 activePart:1 modifiers:0 forceUpdate:&update atTime:time];
+    Check(update && fabs(panned.x-.5)<1e-8 && fabs(panned.y-.5)<1e-8,@"Gesture starts at the shifted source center");
+    panned.objectToCanvas=CGAffineTransformMake(80,0,0,60,100,80);
+    [pannedOSC mouseDraggedAtPositionX:160 positionY:95 activePart:1 modifiers:0 forceUpdate:&update atTime:time];
+    Check(update && fabs(panned.x-.75)<1e-8 && fabs(panned.y-.25)<1e-8,@"Drag follows host zoom and pan changes during the gesture");
+    [pannedOSC mouseDraggedAtPositionX:240 positionY:20 activePart:1 modifiers:0 forceUpdate:&update atTime:time];
+    Check(update && panned.x==1 && panned.y==0,@"Drag outside shifted source clamps after inverse conversion");
+    [pannedOSC mouseUpAtPositionX:80 positionY:200 activePart:1 modifiers:0 forceUpdate:&update atTime:time];
+    Check(update && panned.x==0 && panned.y==1 && panned.undoStarts==panned.undoEnds,@"Release outside shifted source clamps and balances undo");
+    [pannedOSC drawOSCWithWidth:1920 height:1080 activePart:0 destinationImage:tile atTime:time];
+    Check(AlphaAt(tile,100,140)>.9,@"Clamped release draws at the corresponding transformed source corner");
+
+    for(NSUInteger failure=0;failure<3;failure++) {
+        PGOSCAPI *failed=[PGOSCAPI new];
+        failed.rejectConversion=failure==0;failed.nonfiniteConversion=failure==1;failed.partialConversion=failure==2;
+        PGFaceSelectOSC *failedOSC=[[PGFaceSelectOSC alloc] initWithAPIManager:failed];
+        [failedOSC hitTestOSCAtMousePositionX:160 mousePositionY:120 activePart:&part atTime:time];
+        Check(part==0,@"Untouched, nonfinite or partial conversion cannot claim a hit");
+        [failedOSC mouseDownAtPositionX:160 positionY:120 activePart:1 modifiers:0 forceUpdate:&update atTime:time];
+        Check(!update && failed.writes==0 && failed.undoStarts==0,@"Failed conversion cannot write a point or open undo");
+        [failedOSC drawOSCWithWidth:1920 height:1080 activePart:0 destinationImage:tile atTime:time];
+        Check(AlphaAt(tile,80,180)<.01,@"Failed forward conversion clears the prior OSC handle");
+        failed.rejectConversion=failed.nonfiniteConversion=failed.partialConversion=NO;
+        [failedOSC mouseDownAtPositionX:160 positionY:120 activePart:1 modifiers:0 forceUpdate:&update atTime:time];
+        NSUInteger written=failed.writes;
+        failed.rejectConversion=failure==0;failed.nonfiniteConversion=failure==1;failed.partialConversion=failure==2;
+        [failedOSC mouseDraggedAtPositionX:200 positionY:100 activePart:1 modifiers:0 forceUpdate:&update atTime:time];
+        Check(!update && failed.writes==written,@"Conversion failure during drag preserves the previous selection");
+        [failedOSC mouseUpAtPositionX:200 positionY:100 activePart:1 modifiers:0 forceUpdate:&update atTime:time];
+        Check(!update && failed.writes==written && failed.undoStarts==failed.undoEnds,@"Conversion failure on release still closes undo without a write");
+        failed.rejectConversion=failed.nonfiniteConversion=failed.partialConversion=NO;
+        [failedOSC mouseDraggedAtPositionX:200 positionY:100 activePart:1 modifiers:0 forceUpdate:&update atTime:time];
+        Check(!update && failed.writes==written,@"Failed release ends dragging so later stray drag cannot write");
+    }
+    PGOSCAPI *invalidEvent=[PGOSCAPI new];
+    PGFaceSelectOSC *invalidEventOSC=[[PGFaceSelectOSC alloc] initWithAPIManager:invalidEvent];
+    [invalidEventOSC mouseDownAtPositionX:160 positionY:120 activePart:1 modifiers:0 forceUpdate:&update atTime:time];
+    writes=invalidEvent.writes;NSUInteger conversions=invalidEvent.canvasToObjectCalls;
+    [invalidEventOSC mouseDraggedAtPositionX:INFINITY positionY:120 activePart:1 modifiers:0 forceUpdate:&update atTime:time];
+    Check(!update && invalidEvent.writes==writes && invalidEvent.canvasToObjectCalls==conversions,@"Nonfinite canvas drag is rejected before calling the host conversion");
+    [invalidEventOSC mouseUpAtPositionX:160 positionY:NAN activePart:1 modifiers:0 forceUpdate:&update atTime:time];
+    Check(!update && invalidEvent.writes==writes && invalidEvent.undoStarts==invalidEvent.undoEnds,@"Nonfinite canvas release balances undo without changing selection");
     printf("OSC adapter: %lu checks, %lu failures\n",(unsigned long)Checks,(unsigned long)Failures);return Failures?1:0;
 }}