XFT: Forbid XFT rendering on bitmaps (depth-1 pixmaps)
In theory it could work if XFT would just turn gray into
either black or white. But XFT doesn't do it and simply draw
nothing without failing in any way.
To prevent this silent failures, forbid drawing XFT onto bitmaps
(depth-1 pixmaps). After all, the while point of XFT is to use
anti-aliased fonts.
"
COPYRIGHT (c) 1995 by Claus Gittinger
All Rights Reserved
This software is furnished under a license and may be used
only in accordance with the terms of that license and with the
inclusion of the above copyright notice. This software may not
be provided or otherwise made available to, or used by, any
other person. No title to or ownership of the software is
hereby transferred.
"
"{ Package: 'stx:libview' }"
"{ NameSpace: Smalltalk }"
Object subclass:#DeviceHandle
instanceVariableNames:'device drawableId gcId'
classVariableNames:''
poolDictionaries:''
category:'Graphics-Support'
!
!DeviceHandle class methodsFor:'documentation'!
copyright
"
COPYRIGHT (c) 1995 by Claus Gittinger
All Rights Reserved
This software is furnished under a license and may be used
only in accordance with the terms of that license and with the
inclusion of the above copyright notice. This software may not
be provided or otherwise made available to, or used by, any
other person. No title to or ownership of the software is
hereby transferred.
"
!
documentation
"
This is an abstract class for device handles which are responsible
for finalization i.e. to destroy underlying system resources, when the GC
frees an object which has created some system object.
Currently, these are forms and views (streams, cursors, colors and
fonts could also make use of this class - however, for historical reasons,
they continue to use their own private finalization machanisms. This may
change in future versions).
[see also:]
DeviceDrawable
[author:]
Claus Gittinger
"
! !
!DeviceHandle methodsFor:'accessing'!
device
^ device
!
id
"return the id of the dravable"
^ drawableId
"Modified: 20.3.1997 / 16:34:00 / cg"
! !
!DeviceHandle methodsFor:'finalization'!
finalize
"I am abstract"
self subclassResponsibility
"Created: 2.4.1997 / 19:23:14 / cg"
! !
!DeviceHandle methodsFor:'private-accessing'!
setDevice:aDevice id:aDrawableId gcId:aGCId
"set the handles contents"
device := aDevice.
drawableId := aDrawableId.
gcId := aGCId
"Modified: 23.4.1996 / 22:10:26 / cg"
! !
!DeviceHandle class methodsFor:'documentation'!
version
^ '$Header$'
! !