gmane.comp.gnome.gtk+.internationalization

Re: abstract shape PangoLayout/Drop caps/PangoLayout+image from file

Behdad Esfahbod — 2012-05-08T00:57:39

Not possible right now :(.   Been a feature I've wanted to implement for
years, but it never happened.


Not easily possible right now, really.


You can definitely use pango_cairo_context_set_shape_renderer() and draw the
image using GdkPixbuf yourself, but that's it.

behdad

abstract shape PangoLayout/Drop caps/PangoLayout+image from file

Mindaugas Jaunius — 2012-04-20T13:23:09

Is there a way for PangoLayout to handle abstract shape? The default shape
is rectangle is there and easy way to change it or does it require code
modifications in pango line breaking algorithm?

Not exactly the same, but similar question. How to implement drop caps (
http://en.wikipedia.org/wiki/Initial) in PangoLayout (Pango+Cairo)? I tried
using shape renderer, but rendered shape becomes a part of one line only
and is not wrapped by other lines if the size is bigger than one line.

Another similar question. How to insert picture from file to
PangoLayout(Pango+Cairo)? Is there some kind of special pango markup
language tag, special case of using custom shape renderer or is it somehow
related to cairo and surface creation?

Any tips/thoughts/ideas are greatly appreciated.
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Pango and freetype2 charmap?

mathog — 2012-03-12T22:28:14

Still trying to track down the issue with glyph's not mapping 1:1 with 
Symbol fonts.  Could not reproduce
the problem in a test program (it was not picking up Symbol font at 
all) so have been working on it in Inkscape trunk.
Traced part of the issue to this area of 
inkscape/src/libnrtype/FontInstance.cpp:

     theFace=pango_ft2_font_get_face(pFont); // Deprecated, use 
pango_fc_font_lock_face() instead
     if ( theFace ) {
         FT_Select_Charmap(theFace,ft_encoding_unicode) && 
FT_Select_Charmap(theFace,ft_encoding_symbol);
     }

Put some debug statements like these

     for(i=0x70;i<0xB0;i+=16){
       myfile << std::hex << i ;
       for(j=i;j<i+16;j++){
         myfile << " " << std::hex << FT_Get_Char_Index(theFace,j);
       }
       myfile <<endl;
     }

above and below the FT_Select_Charmap and found

BEFORE
70 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
80 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
90 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
a0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
in font_instance::InitTheFace set charmap F

Re: Pango issue? Symbol font characters above A0 incorrect for multiple applications

mathog — 2012-03-09T16:42:31

Added a version of the list_fonts function from here

   http://www.lemoda.net/pango/list-fonts/index.html

and while it listed 125 families of fonts, it did not list any 
symbol/wingdings/webdings type fonts.
So when the test program specified those it used some fallback font 
instead.  Inkscape lists those fonts.
Presumably I need to use some other set of headers or font backend?  
The test program currently has these
headers:

#include <cairo.h>
#include <pango/pangocairo.h>
#include <strings.h>
#include <stdlib.h>
#include <stdio.h>

Tried adding this (found in Inkscape in what looked like the right 
place):

#include <pango/pangowin32.h>

or this

#include <pango/pangoft2.h>
#include <freetype/freetype.h>

or both, but none of these brought in the Symbol font.

Pango version is 1.28.3 (same as Inkscape is using, and it sees Symbol 
font).

Why does Inkscape pull in Symbol and the test program not?

Thank you,

David Mathog
mathog< at >caltech.edu
Manager, Sequence Analysis Facility, Biology Division, Caltech

Re: Pango issue? Symbol font characters above A0 incorrect for multiple applications

mathog — 2012-03-08T22:06:23

I built a few small test programs and was able to rule out Cairo as the 
source of the problem.
Symbol font rendered correctly (to PNG in this case) if just the "toy" 
Cairo text interface was
used.  The equivalent Pango test program seemed to be ignoring the font 
name "symbol" or "Symbol", or
at least the output produced was identical to output when the font was 
"blather", which is definitely
not a font on my system. Ditto for "Bookshelf Symbol 7", "Wingdings". 
It did use the right font for
"Times New Roman" and even "Blackadder ITC".  All of the fonts which 
were ignored work
perfectly well in MS Word, PowerPoint, etc. on this Windows XP system.

The test code is here:

https://bugs.launchpad.net/inkscape/+bug/948245/+attachment/2836479/+files/testcairo.zip

So I am more confused than before.  Inkscape uses Pango.  In Inkscape 
"symbol" font works (giving
"alpha" for "a", for instance) for characters <128, but in my little 
test program
case not even that worked.  Is there some define that is needed to

Re: PangoGlyphString + PangoLayout?

Behdad Esfahbod — 2012-03-08T16:08:45

Yes.

Basically, you want to copy pango/modules/basic-fc.c and work it from there.

behdad

Re: PangoGlyphString + PangoLayout?

Mindaugas Jaunius — 2012-03-08T15:41:31

Ok lets try another approach. I am not sure if I undestood the advices
correctly.

Right now I run my configure --with-included-modules=yes , so by default
pango choses one of the modules already installed based on language script?

pango_module_register() requires PangoIncludedModule. How should I "link"
my code to PangoIncludedModule object, does that require creating another
PangoEngine?

2012/3/7 Behdad Esfahbod <behdad< at >behdad.org>

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Re: PangoGlyphString + PangoLayout?

Behdad Esfahbod — 2012-03-07T15:53:03

The only example I know of is Pango source code itself.

behdad

Re: PangoGlyphString + PangoLayout?

Mindaugas Jaunius — 2012-03-07T15:50:52

Would it be possible for somebody to provide an example or a link to
example of how to use pango_module_register()? I tried looking for any
example, but was not able to find one. I am new at using pango and
from very beginning I see a lack of any examples of how to actualy use
it.

2012/3/6 Behdad Esfahbod <behdad< at >behdad.org>:

Re: Pango issue? Symbol font characters above A0 incorrect formultiple applications

Jeremie Hornus — 2012-03-06T20:18:08

On 6 Mar 2012, at 20:48, Behdad Esfahbod wrote:


That is characters found in Symbol fonts.
Font with microsoft's "symbol" codepage, defined in <cmap> by platformID="3" platEncID="0"

The font named "Webdings" is an example of such fonts:
http://www.microsoft.com/typography/web/fonts/webdings/default.htm


J.

Re: Pango issue? Symbol font characters above A0 incorrect for multiple applications

mathog — 2012-03-06T20:47:54

Forgot to mention that both applications are also linked to a 
libfontconfig dll.  So they must use fontconfig some
of the time, but I cannot rule out that they might use the native one 
at other times.

Regards,

David Mathog
mathog< at >caltech.edu
Manager, Sequence Analysis Facility, Biology Division, Caltech

Re: Pango issue? Symbol font characters above A0 incorrect formultiple applications

Jeremie Hornus — 2012-03-06T20:47:48

On 6 Mar 2012, at 21:29, Behdad Esfahbod wrote:


I am not experiencing David Mathog's problem; was just detailing what "symbol character" meant in that situation.


regards,
Jeremie

Re: Pango issue? Symbol font characters above A0 incorrect for multiple applications

mathog — 2012-03-06T20:45:12

Windows.

Not sure which backend, but the pango dll's Inkscape uses are:

libpango, libpangocairo, libpangoft2, libpangomm, libpangowin32

Gimp is the same except it doesn't use libpangomm

Thanks,

David Mathog
mathog< at >caltech.edu
Manager, Sequence Analysis Facility, Biology Division, Caltech

Re: Pango issue? Symbol font characters above A0 incorrect formultiple applications

Behdad Esfahbod — 2012-03-06T20:29:44

And are you experiencing this on Windows or Linux?  If on Windows, do you know
if it's using the fontconfig backend or the native win32 backend?

behdad

Re: Pango issue? Symbol font characters above A0 incorrect formultiple applications

Jeremie Hornus — 2012-03-06T20:23:19

On 6 Mar 2012, at 20:48, Behdad Esfahbod wrote:


That is characters found in Symbol fonts.
Font with microsoft's "symbol" codepage, defined in <cmap> by platformID="3" platEncID="0"

The font named "Webdings" is an example of such fonts:
http://www.microsoft.com/typography/web/fonts/webdings/default.htm


J.


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Re: Pango issue? Symbol font characters above A0 incorrect for multiple applications

mathog — 2012-03-06T20:21:32

http://en.wikipedia.org/wiki/Symbol_%28typeface%29

The font works as expected for hex 20 to 7F, but displays the wrong 
characters in
the applications mentioned for A0 to FF.

David Mathog
mathog< at >caltech.edu
Manager, Sequence Analysis Facility, Biology Division, Caltech

Re: Pango issue? Symbol font characters above A0 incorrect formultiple applications

John Ralls — 2012-03-06T20:12:20

On Mar 6, 2012, at 11:48 AM, Behdad Esfahbod wrote:


He means the non-letter characters at code points u00A0 - u00BF, u00D7, and u00F7.

Dunno what character set he's trying to use, though: u00A5 *is* the Yen sign, and the math X is u00D7.

Regards,
John Ralls

Re: Pango issue? Symbol font characters above A0 incorrect for multiple applications

mathog — 2012-03-06T20:09:06

Characters rendered using the symbol font. In that font hex B3 should 
render as the
"greater than or equal to" character.

David Mathog
mathog< at >caltech.edu
Manager, Sequence Analysis Facility, Biology Division, Caltech

Re: Pango issue? Symbol font characters above A0 incorrect formultiple applications

Behdad Esfahbod — 2012-03-06T19:48:28

What are "symbol characters"?!

On 03/06/2012 01:54 PM, mathog wrote:

Pango issue? Symbol font characters above A0 incorrect for multiple applications

mathog — 2012-03-06T18:54:31

Symbol font characters with hex values >A0 (and <=FF) are generally 
displayed incorrectly in Inkscape and Gimp.
The character shown is not the one corresponding to the hex value.  For 
instance, a5 is either X (times symbol) or
Yen symbol, when it should be the infinity symbol.  Symbol characters 
<A0 display correctly.  This
was seen on Windows XP SP3, with Inkscape 0.48.2, Inkscape trunk (from 
last week) and Gimp 2.6.10.

The two applications give the same wrong characters, so the problem may 
be with Pango, which they both use.

For details and examples for Inkscape see:

https://bugs.launchpad.net/inkscape/+bug/948245

Thank you,

David Mathog
mathog< at >caltech.edu
Manager, Sequence Analysis Facility, Biology Division, Caltech

Re: Gravity Support / pangowin32

Jeremy Moles — 2012-03-06T15:05:02

I'm currently using mingw64 on Fedora16 to cross-compile Pango for
Windows. Is there a way to encourage Pango to use a particular
backend?  

I don't mind using Fontconfig/Freetype if I need to; in the end, all
that is happening in our code is something very similar to what Clutter
does (or did): a PangoGlyphString is fed to our rendering callback
function, we use Cairo to rasterize the font into a texture, and
maintain our own caching atlas.

We don't actually ever use Pango to "draw" anything, we just use its
layout and styling engine. I don't know if this simplifies things or
not. :)

At any rate, I'll try the things you mentioned right away...