RE: [XaraXtreme-dev] Current/default font

[Martin Wuerthner <lists@xxxxxxxxxxxxxxx>]

In message <5056CBC646CB4047BB26120F4377DB71DC8423@xxxxxxxxxxxxxxxxxxx 
>
          "Phil Martin" <Phil@xxxxxxxx> wrote:

> Further: The ability to save the Current attributes in documents is a
> recent addition (<4 years ago). So the current attributes sections of
> document are not guaranteed to be present and there will be many old
> documents which do not carry /any/ Current attributes.
> 
> Further2: There are only two Current attribute sets saved in documents
> at the moment but there could be more in the future.
> 
> To answer Neil's question (as Gerry already has): Default attributes are
> not saved with documents.
> 
> To answer Alex's question: It looks as if text objects always carry at
> least one pair of TAG_FONT_DEF_XXX and TAG_TEXT_FONT_TYPEFACE records in
> XAR files controlling the font - even when that font is "Times Roman",
> the value of the Default font face attribute. I can't say for sure
> whether that's always been true, though.

If that is true, then it is a bug. And I presume you mean "Times New 
Roman".

In LX, it is not true. If you apply Times New Roman to a text object 
it does not have a font attribute nor should it have one.

Martin

>> -----Original Message-----
>> From: owner-dev@xxxxxxxxxxxxxxxx
>> [mailto:owner-dev@xxxxxxxxxxxxxxxx] On Behalf Of Gerry Iles
>> Sent: 27 July 2006 13:16
>> To: dev@xxxxxxxxxxxxxx
>> Subject: RE: [XaraXtreme-dev] Current/default font
>> 
>> There is obviously much confusion about what is really meant
>> by the terms default and current when dealing with attributes.
>> 
>> The default attributes are the ones right at the top of the
>> document tree that ensure that all attributes get set to a
>> sensible initial value when the tree is rendered.  In the
>> case of text, this is always Times New Roman and always has
>> been.  The default attributes do not get saved in the Xar
>> format as every xar file would have to have a copy of them
>> and this would be a waste of space.  They must therefore never change.
>> 
>> A current attribute is the attribute applied when a new
>> object is created.  For text this is currently Arial.  The
>> current attributes are saved in the xar format.  In fact, two
>> sets of them are saved, one set that applies to new text
>> objects and another set that applies to everything else.
> 
>> 
>> Attribute optimisation ensures that there are at most two
>> attributes of each type affecting each object.  One of these
>> is always the default attribute at the top of the tree and
>> the other is the actual attribute applied to the object
>> (though it can be either a child of the object or a
>> left-sibling or a left sibling of an ancestor due to optimisation).
>> This attribute is only present if it is different to the default one.
>> 
>> The issue here seems to be that if the current font attribute
>> in a document is not installed, whether we can change it to
>> one that is installed.  There should be no danger whatsoever
>> in changing the current attributes to ones that make sense
>> for the user's machine.  The only issue I can really come up
>> with is if someone creates a template for a specific purpose
>> that has the current font set to something explicit, if the
>> current font is silently changed because you don't have the
>> correct one installed then text you create will not be in the
>> "correct" font.
>> 
>> Gerry
>> 
>> -----Original Message-----
>> From: owner-dev@xxxxxxxxxxxxxxxx
>> [mailto:owner-dev@xxxxxxxxxxxxxxxx] On Behalf Of Alex Bligh
>> Sent: 27 July 2006 12:49
>> To: dev@xxxxxxxxxxxxxx
>> Cc: Alex Bligh
>> Subject: Re: [XaraXtreme-dev] Current/default font
>> 
>> Neil Howe wrote:
>> 
>> > Ok - specific question Phil. Is the default font saved in a document
>> or
>> > not? I'm surprised if it's not saved, but that's what Martin is
>> saying.
>> > 
>> > If the default font is saved, we can safely change both as
>> originally
>> > decided. If it isn't saved we should only change the current font.
>> 
>> No that's not the right question. The default attribute
>> doesn't need to be saved. What we need to be sure of is that
>> any text node saved always has AN attribute attached when
>> saved. If so, we don't care what the default attribute is, as
>> it won't influence rendering.
>> 
>> Alex