Eliot Miranda uploaded a new version of EToys to project The Trunk:
http://source.squeak.org/trunk/EToys-eem.404.mcz

==================== Summary ====================

Name: EToys-eem.404
Author: eem
Time: 7 October 2020, 7:59:19.175862 pm
UUID: 92684a08-f39d-444c-b97e-8f45b7592cd1
Ancestors: EToys-eem.403

CameraInterface: on Windows the frame extent may not be known until the first frame is delivered, so defer initialization until after the semaphore has been signalled in interruptDrivenVideoTest:.

=============== Diff against EToys-eem.403 ===============

Item was changed:
  ----- Method: CameraInterface class>>interruptDrivenVideoTest: (in category 'test') -----
  interruptDrivenVideoTest: camNum
  	"A quick test of video input. Displays video on the screen until the mouse is pressed.
  	 Answer nil if the interrupt-driven interface is unavailable."
  	"self interruptDrivenVideoTest: 1"
+ 	"self interruptDrivenVideoTest: 2"
- 	"[self interruptDrivenVideoTest: 2"
  	"[self interruptDrivenVideoTest: 2] fork.
  	  self interruptDrivenVideoTest: 1"
  
  	| semaphore height |
  	height := 16.
  	1 to: camNum - 1 do:
  		[:camIndex| "N.B. the of an unopened camera is 0 at 0"
  		height := height + (CameraInterface frameExtent: camIndex) y + 16].
  	(CameraInterface cameraIsOpen: camNum) ifFalse:
  		[(CameraInterface openCamera: camNum width: 320 height: 240) ifNil:
  			[self inform: 'no camera'.
  			 ^nil]].
  	semaphore := Semaphore new.
  	[CameraInterface camera: camNum setSemaphore: (Smalltalk registerExternalObject: semaphore)]
  		on: Error
  		do: [:err|
  			Smalltalk unregisterExternalObject: semaphore.
  			self inform: 'interrupt-driven camera interface unavailable: ', err messageText.
  			^nil].
  	[| f n startTime frameCount msecs fps |
- 	 (self frameExtent: camNum) x = 0 ifTrue: [self inform: 'no camera'. ^nil].
- 	 f := Form extent: (CameraInterface frameExtent: camNum) depth: 32.
- 	 frameCount := 0.
- 	 startTime := nil.
  	 [semaphore wait.
+ 	 "N.B. the frame extet may not be known until the delivery of the first frame.
+ 	  Si we have to delay initialization."
+ 	  startTime ifNil:
+ 		[(self frameExtent: camNum) x = 0 ifTrue: [self inform: 'no camera'. ^nil].
+ 		 f := Form extent: (CameraInterface frameExtent: camNum) depth: 32.
+ 		 frameCount := 0.
+ 		 startTime := Time millisecondClockValue].
  	  Sensor anyButtonPressed] whileFalse:
  		[n := CameraInterface getFrameForCamera: camNum into: f bits.
  		n > 0 ifTrue:
+ 			[frameCount := frameCount + 1.
+ 			 f displayAt: 16 @ height]].
- 			[startTime ifNil: [startTime := Time millisecondClockValue].
- 			frameCount := frameCount + 1.
- 			f displayAt: 16 @ height]].
  	 msecs := Time millisecondClockValue - startTime.
  	 fps := (frameCount * 1000) // msecs.
  	 ^frameCount printString, ' frames at ', fps printString, ' frames/sec']
  		ensure:
  			[CameraInterface closeCamera: camNum.
  			 Smalltalk unregisterExternalObject: semaphore.
  			 Sensor waitNoButton]!