[squeak-dev] The Trunk: Morphic-mt.1953.mcz

commits at source.squeak.org commits at source.squeak.org
Wed Mar 30 10:53:57 UTC 2022


Marcel Taeumel uploaded a new version of Morphic to project The Trunk:
http://source.squeak.org/trunk/Morphic-mt.1953.mcz

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

Name: Morphic-mt.1953
Author: mt
Time: 30 March 2022, 12:53:51.805263 pm
UUID: d560c970-7e24-ac43-bfac-ca68c9e53541
Ancestors: Morphic-mt.1952

Tweak prior commentary bc. I just (re-)discovered the actual behavior of #deferUpdates: across platforms.

=============== Diff against Morphic-mt.1952 ===============

Item was changed:
  ----- Method: FormCanvas>>showAt:invalidRects: (in category 'other') -----
  showAt: pt invalidRects: updateRects
+ 	"Show the receiver's bits (i.e, the form it is currently drawing on) on the screen, which is represented by the global Display form.
+ 	
+ 	NOTE THAT #copyBits has the side effect of calling #primShowRectLeft:right:top:bottom: if the blitting target is that Display form. Thus, it is similar to calling #forceDamageToScreen: with updateRects after modifying Display directly but in deferred-drawing mode.
+ 	
+ 	NOTE THAT not all platforms support deferred updates even though they are not failing in #deferUpdates:. Thus, this method has no practical benefit these days unless forced via #disableDeferredUpdates:."
- 	"Show the receiver's bits (i.e, the form it is currently drawing on) on the screen, which is represented by the global Display form. NOTE THAT #copyBits has the side effect of calling #primShowRectLeft:right:top:bottom: if the blitting target is that Display form. Thus, it is similar to calling #forceDamateToScreen: with updateRects after modifying Display directly but in deferred-drawing mode. Yet, not all platforms support #deferUpdates:, and that is why this method exists."
  
  	| blt |
  	blt := (BitBlt toForm: Display)
  		sourceForm: form;
  		combinationRule: Form over.
  	updateRects do:
  		[:rect |
  		blt sourceRect: rect;
  			destOrigin: rect topLeft + pt;
  			copyBits "...entails #primShowRect:... see above"]!



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