'From etoys4.0 of 9 October 2008 [latest update: #2247] on 17 August 2009 at 1:16:56 pm'!
"Change Set:		fixCursor-bf
Date:			17 August 2009
Author:			Bert Freudenberg

Cross-published to Moshi from etoys4.0 update 2251fixCursor-bf

On the Mac, the cursor looks jagged. Its alpha was not pre-multiplied. Also, it had a bluish tint. Postscript initializes new cursor."!


!Form methodsFor: 'other' stamp: 'bf 8/17/2009 13:08'!
preMultiplyAlpha
	"Pre-multiply each pixel by its alpha, for proper alpha compositing (BitBlt rule 34).
	E.g., half-transparent green 16r7F00FF00 becomes 16r7F007F00"

	depth = 32 ifFalse: [^self].
	1 to: bits size do: [:i |
		| v a r g b |
		v := bits at: i.
		a := v bitShift: -24.
		r := ((v bitShift: -16) bitAnd: 255) * a // 255.
		g := ((v bitShift: -8) bitAnd: 255) * a // 255.
		b := (v bitAnd: 255) * a // 255.
		bits at: i put: (a bitShift: 24) + (r bitShift: 16) + (g bitShift: 8) + b].! !


!CursorWithAlpha class methodsFor: 'constants' stamp: 'bf 8/17/2009 12:55'!
biggerNormal
	"self biggerNormal show"
	"(Base64MimeConverter mimeEncode: ((FileStream readOnlyFileNamed: 'EtoysCursor.png') binary)) upToEnd"

	^self constants at: #biggerNormal ifAbsentPut: [
		| form cursor |
		form := (PNGReadWriter on: (Base64MimeConverter mimeDecodeToBytes:
			'iVBORw0KGgoAAAANSUhEUgAAABsAAAArCAYAAACJrvP4AAAACXBIWXMAAAsTAAALEwEAmpwY
			AAAEF0lEQVRYCb2XS0hcVxjHj2/G8ZWMQQbSGO2iRhERwRALBmJNoOOqwUXtYtxOTQJxI8SN
			CyXJqggVEghusrAuBB8IddUWF64CvnCj+AJrsYKio6JJOPn/j+dc5s6MztyZMR/857v3PL7f
			/c4595w7QmiTUvrN9ZV7wGhfB3jOunpgOoYtPQQm19fXn6DsulY2PJUSi4ARvLm5+SuiE5hS
			mAsBXSYzv99vLuXExMRL1H2jlRKoDYbAMhS4uLj4PJUwN4K5TTqEhQPHxsZeayCzTCrDqLC0
			tLQryTAqjNmFA1OR4YWwaMBk5/BSWDRgMhnGhEUDJpphXDACqdDXIpEMHcHCF43TDB3Bks0w
			IVj4kMabYcKwcGA8c+gIlp2drRaKGc5wYKwMHcFycnIiYOHACzLkhi9SAgsHRsnQOSzaMBJk
			FPoejo6OvkJ5iZY67R1lZoJe5kOBKysrzxzBCgoKrCcnpKysTO7v75sjMKafmZl5gX6uNPww
			M4EeQXrsEAJDJc7Ozngr8vPzRVVVldjZ2RGrq6uqrLi4WPT394u2tjZxeHj4P8C7qiLkJzMz
			8zNvc3NzT+jR/yl9xDBmZWWpTAoLC2V9fb3c29uTXV1dtuwaGxtVRgcHBzuI0QY91vLBUw+0
			voOnXPyyijBEUWWVlZViampKFBUVCcyDKC8vt9pitYnp6WlmfqO7u/uOVRHjIiKzjIwM2dDQ
			oDIKnZCWlhZbdoFAQFUvLCz8Bcb3WrfgqWItFR/XKrEIWG1trQWam5v7Z3Bw8C2jjoyMyNLS
			UgvIYeYQ05A5h5HA+GE1NTVWgPn5+b/RubWiosJ/enoaZNDq6moLhjrZ19fHYjk7O/sO9/eg
			G1oZ8JTNbJmZJ9Wgn9GyleJQMWhPT48NhnllsTw+Pv4X7WLCuI1YX8TsuLy8/CfKmrXuwt9t
			b2//iXX4LJder9cCut1uOT4+zio5PDz8G9pWaqm4uLaZDaZBXLY2GO4bdnd3PzAowDZYc3Mz
			i+X29vY82l0K4ypR/2JOTk7e49qsIuMLUEbdXFpaes6gk5OT0uPxWECeBGtra6ySvb29v6Bt
			ve7DfjZTsKOjo99RyvkzEOMtGOpuBoPBbQblQsK9Ejfnzs5OFsuNjY0JlF8IQ11clodWeVgo
			bxh0YGDABmOmNGxzh2j3EPJqRV2VqLvUFKyjo+NHBuWqxb4nS0pKVFZmGFG+gihJw8wTerHx
			/kEgXng6y7a2thYxnAHAHkHfavEcoxyZBcOh+AOHixS+7HwnfT4f/6nynSQoaZh5MjWcTU1N
			94aGhtrr6up8qLgPcVFQd7SuwVPmIdN5njk1wmi31a8QHu3VuYVrLhDaf+dOHGgvE4Gp3RsB
			cnUQMx+f9P1H7c9PXyHUIcoy01HXX637AibwgHAnFRPGAAAAAElFTkSuQmCC' 
				readStream) readStream) nextImage.
	cursor := CursorWithAlpha extent: form extent depth: 32.
	form displayOn: cursor.
	cursor offset: -2@-1.
	cursor preMultiplyAlpha.
	cursor]! !

!CursorWithAlpha class methodsFor: 'constants' stamp: 'bf 8/17/2009 12:56'!
resetConstants
	Constants := nil.
! !


!Cursor class methodsFor: 'constants' stamp: 'bf 8/17/2009 12:55'!
normal
	"Answer the instance of me that is the shape of an arrow slanted left."

	^Preferences biggerCursors
		ifTrue: [CursorWithAlpha biggerNormal]
		ifFalse: [NormalCursor]! !

CursorWithAlpha class removeSelector: #olpcNormal!
"Postscript:"
CursorWithAlpha resetConstants.
Cursor wait show.
Cursor normal show!