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Bug 147386 - Clipped text when exporting to .png
Clipped text when exporting to .png
Status: RESOLVED FIXED
Product: dia
Classification: Other
Component: exports
0.93
Other other
: Normal normal
: 0.98
Assigned To: Dia maintainers
Dia maintainers
: 376662 (view as bug list)
Depends on:
Blocks: 145575
 
 
Reported: 2004-07-12 08:12 UTC by iain
Modified: 2011-06-13 20:53 UTC
See Also:
GNOME target: ---
GNOME version: ---

Attachments
Add some extra space to the exported image (3.07 KB, patch)
2006-02-07 21:01 UTC, Torben H. Nielsen 		none Details | Review
Dia file, flowchart box, 1 pixel lines (723 bytes, application/x-dia)
2006-04-26 11:53 UTC, Roland Stigge 		  Details
Resulting PNG (492 bytes, image/png)
2006-04-26 11:55 UTC, Roland Stigge 		  Details
Example diagram, clips on 0.96.1 (832 bytes, application/x-dia-diagram)
2008-11-29 19:52 UTC, Daniel Nebdal 		  Details
The exported bitmap of the previously attached diagram (9.88 KB, image/png)
2008-11-29 19:55 UTC, Daniel Nebdal 		  Details
Example of Cairo PNG export (613 bytes, image/png)
2009-05-06 09:33 UTC, Heikki Paajanen 		  Details
Example of Pixbuf PNG export (543 bytes, image/png)
2009-05-06 09:36 UTC, Heikki Paajanen 		  Details
Add same rounding and + 1 as in pixbuf plug-in (2.22 KB, patch)
2009-05-06 16:23 UTC, Heikki Paajanen 		none Details | Review

Description iain 2004-07-12 08:00:53 UTC 
Package: dia
Severity: normal
Version: 0.93
Synopsis: Clipped text when exporting to .png
Bugzilla-Product: dia
Bugzilla-Component: exports
 
Description:
Description of Problem:
When the attached diagram #1 is exported to .png, the first "c" in
"cached" in the lower left corner is clipped slightly.  When diagram #2
is exported, the "c" is rendered correctly.  Diagram #2 is the same as
diagram #1, but has a line below and to the left of the "c" in
question.
 
Steps to reproduce the problem:
1. Load diagram #1
2. Export to .png
3. View .png file
                                                                                
Actual Results:
Clipped "c" character in lower left corner
                                                                                
Expected Results:
Fully rendered text.
                                                                                
How often does this happen?
Completely reproducible.
                                                                                
Additional Information:
See attached diagrams




------- Bug moved to this database by unknown@bugzilla.gnome.org 2004-07-12 04:00 -------


---
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Unknown platform unknown. Setting to default platform "Other".
Unknown milestone "unknown" in product "dia".
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   Previous reporter was iain@mcclatchie.com.
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Comment 1 Iain McClatchie 2004-07-13 21:27:50 UTC 
This bug is in version 0.93 of dia
Comment 2 Scott Anderson 2005-02-04 16:17:15 UTC 
I can confirm this bug in 0.94.  When I exported my graphic to PNG, the edge of
one of my arrow lines was clipped at the edge.  It seems to be an edge effect. 
I am running Debian testing.  Here's the information from report bug:

Package: dia
Version: 0.94.0-4
-- System Information:
Debian Release: 3.1
  APT prefers testing
  APT policy: (900, 'testing'), (600, 'unstable')
Architecture: i386 (i686)
Kernel: Linux 2.4.26
Locale: LANG=C, LC_CTYPE=C (charmap=ANSI_X3.4-1968) (ignored: LC_ALL set to C)

Versions of packages dia depends on:
ii  dia-common                  0.94.0-4     Diagram editor (common files)
ii  dia-libs                    0.94.0-4     Diagram editor (library files)
ii  libart-2.0-2                2.3.16-6     Library of functions for 2D graphi
ii  libatk1.0-0                 1.8.0-4      The ATK accessibility toolkit
ii  libc6                       2.3.2.ds1-20 GNU C Library: Shared libraries an
ii  libfreetype6                2.1.7-2.3    FreeType 2 font engine, shared lib
ii  libglib2.0-0                2.6.1-2      The GLib library of C routines
ii  libgtk2.0-0                 2.4.14-2     The GTK+ graphical user interface
ii  libpango1.0-0               1.6.0-3      Layout and rendering of internatio
ii  libpng12-0                  1.2.8rel-1   PNG library - runtime
ii  libpopt0                    1.7-5        lib for parsing cmdline parameters
ii  libxml2                     2.6.11-5     GNOME XML library
ii  zlib1g                      1:1.2.2-3    compression library - runtime

Let me know if you need further information.
Comment 3 Lars Clausen 2005-02-27 17:09:37 UTC 
Marking as confirmed.
Comment 4 Albert Veli 2005-05-06 05:18:00 UTC 
I'm running dia 0.94 on Debian/testing. A couple of pixels are clipped on the
left, right and bottom edge on all diagrams when exporting to .png. I didn't
notice any clipping on the top edge but it may be there too.

It is possible to get around this by exporting to .svg and use another program
(like incskape) to export to .png.
Comment 5 Torben H. Nielsen 2006-02-07 21:00:05 UTC 
Unfortunately a couple of pixels are clipped when exporting to a bitmap formats in all bitmap export formats no matter whether it is the builtin png export, pixbuf or cairo.
Comment 6 Torben H. Nielsen 2006-02-07 21:01:30 UTC 
Created attachment 58885 [details] [review]
Add some extra space to the exported image
Comment 7 Hans Breuer 2006-02-11 12:36:53 UTC 
Having a diagram which shows the behavior would be nice. Although I noticed
that italics text is even clipped on the display (some misuse or limitation 
of Pango bounding box?) I was not able to reproduce the general clipping while
creating a PNG ...

There sure may be something wrong in general with Dia's way to calculate
text bounding boxes. But instead of just add some random pixels size to
some exporters I'd like to reproduce and fix for all exporters.
Comment 8 Roland Stigge 2006-04-26 11:50:55 UTC 
I guess this is the same as #145575.

At Debian, we have an example. I'm attaching the .dia as well as the resulting .png.

See also http://bugs.debian.org/364867
Comment 9 Roland Stigge 2006-04-26 11:53:59 UTC 
Created attachment 64314 [details]
Dia file, flowchart box, 1 pixel lines
Comment 10 Roland Stigge 2006-04-26 11:55:00 UTC 
Created attachment 64315 [details]
Resulting PNG
Comment 11 era+gnome 2007-05-30 10:36:43 UTC 
Not sure if this is the same bug, but I found that on an Ubuntu 7.04 system, several text snippets inside the image were clipped at the end of line when I exported to PNG.  This was with just whatever happened to be the default font (apparently "Sans" 0.80).

I worked around this by adding a space after each clipped letter.
Comment 12 Hans Breuer 2007-09-09 17:17:42 UTC 
I'm taking this bug as the part of bug #145575 which depend on correct *text* bounding boxes. Maybe Dia is not correctly using the ink_rect, e.g. pango_layout_get_pixel_size() delivers the logical rect which IIRC does not necessarily include all the space needed for the drawing of the glyphs.

Also the use of pango_layout_iter_get_line_extents() in dia_font_get_sizes() should be reviewed because it also ignores the ink_rect.
Comment 13 Lars Clausen 2007-10-27 12:01:50 UTC 
Roland, your example works fine in 0.96.1, but it doesn't really show the problem described in this bug. Not sure what happened to the first attachments.
Comment 14 Lars Clausen 2007-10-30 18:34:13 UTC 
*** Bug 376662 has been marked as a duplicate of this bug. ***
Comment 15 Roland Stigge 2008-01-12 20:25:23 UTC 
Lars, you can see the problem with my two files this way: The dia file has a box (with some text inside, but unimportant). In the png exported version, you only see the left and top lines of the box. I.e., the other two (bottom & right) are cropped.
Comment 16 Daniel Nebdal 2008-11-29 19:52:58 UTC 
Created attachment 123659 [details]
Example diagram, clips on 0.96.1

On my copy of 0.96.1 this provokes the clipping bug on all four sides of the image.
Comment 17 Daniel Nebdal 2008-11-29 19:55:53 UTC 
Created attachment 123660 [details]
The exported bitmap of the previously attached diagram

Exported with the builtin PNG filter in dia 0.96.1 on FreeBSD.
Comment 18 Daniel Nebdal 2008-11-29 19:58:17 UTC 
Comment on attachment 123660 [details]
The exported bitmap of the previously attached diagram

Apologies - attached to the wrong bug. Too many windows open.
Comment 19 Heikki Paajanen 2009-05-06 09:33:22 UTC 
Created attachment 134089 [details]
Example of Cairo PNG export

Problem still present in current dia git version (~0.97).

With the example file from comment #9 the Cairo PNG export clips the bottom line of the rectangle.
Comment 20 Heikki Paajanen 2009-05-06 09:36:47 UTC 
Created attachment 134090 [details]
Example of Pixbuf PNG export

Pixbuf PNG export has extra line of pixels on the right side.
Comment 21 Heikki Paajanen 2009-05-06 16:23:35 UTC 
Created attachment 134114 [details] [review]
Add same rounding and + 1 as in pixbuf plug-in

Added same "extra" space to exported area that is in pixbuf plug-in per bug #413275.

After this the cairo rendering is not perfect yet, but at least better (doesn't clip) and the relevant code comments in diacairo.c match again :)
Comment 22 Hans Breuer 2011-06-13 20:53:43 UTC 
With my recent commit it seems to work fine now:
http://git.gnome.org/browse/dia/commit/?id=af9e49e5cbce7c5706f318a4cd1da3292da0f0cf