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Deleting GDI resources (FONTs BRUSHes etc.) on
Win32, which are still selected in HDC(= SWT GC) does not lead to crash most of
the time. This is by design of Win32, not of SWT/Win32.
I mean, even if you do this same error in a
C/Win32 program, it will not crash.
Unfortunately, this is not the case
for other platforms, esp. GTK+, where the font resource is a C structure,
which when disposed while still selected in graphics context will lead to
crash..
----- Original Message -----
Sent: Friday, October 08, 2004 6:47
PM
Subject: Re: [platform-swt-dev] SWT
produce a VM failure on a GC.getFontMetrics() call.
To add water to your mill
...
Same code on Windows doesn't raise
any crash,
In one hand: isDisposed()
check is done for swt-win32 port, or
in other hand swt-win32 port do a copy of font at GC.setFont() and use
it, meaning
that user (me) can dispose
the font without crashing ...
Ok,
the bug here is that I wrote bad code: no more crash until I correct it (do
not dispose until font is used in gc ...).
Thanks,
Arnaud.
Mike Wilson
<Mike_Wilson@xxxxxxxxxx>
Sent by: platform-swt-dev-admin@xxxxxxxxxxx
10/08/2004 04:48 PM
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Subject
| Re: [platform-swt-dev]
SWT produce a VM failure on a GC.getFontMetrics()
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True, but that does excuse the fact that SWT crashed. Seems like
another
place where an isDisposed check is
needed.
McQ.
Arnaud De Muyser
<ademuyser@xxxxxxxxxx>
Sent by:
platform-swt-dev-admin@xxxxxxxxxxx
10/08/04 09:03
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Subject
Re:
[platform-swt-dev] SWT produce a VM failure on a GC.getFontMetrics()
call.
Seek in it before sent mail ....
Sorry.
This is due to the following situation:
Font font = new
Font( ... );
gc.setFont( font );
font.dispose();
gc.getFontMetrics() => core.
The right think is to not dispose
font after set it in a gc ...
Arnaud De
Muyser/France/IBM@IBMFR
Sent by: platform-swt-dev-admin@xxxxxxxxxxx
10/08/2004 02:37 PM
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Subject
[platform-swt-dev] SWT produce a VM failure on a
GC.getFontMetrics() call.
Does anyone
have already seen this kind of joke ?
Using Eclipse SDK 3.0.1 on a Linux
Suse.
Thanks for your help.
Arnaud.
**
(<unknown>:668): CRITICAL **: file pango-fontmap.c: line 126
(pango_font_map_load_fontset): assertion
`pango_font_description_get_family (desc) != NULL' failed
**
(<unknown>:668): CRITICAL **: file pango-fontset.c: line 101
(pango_fontset_get_metrics): assertion `fontset != NULL' failed
(<unknown>:668): GLib-GObject-CRITICAL **: file gobject.c: line
1337
(g_object_unref): assertion `G_IS_OBJECT (object)' failed
**
(<unknown>:668): CRITICAL **: file fonts.c: line 1206
(pango_font_metrics_get_ascent): assertion `metrics != NULL' failed
** (<unknown>:668): CRITICAL **: file fonts.c: line 1226
(pango_font_metrics_get_descent): assertion `metrics != NULL' failed
** (<unknown>:668): CRITICAL **: file fonts.c: line 1245
(pango_font_metrics_get_approximate_char_width): assertion `metrics !=
NULL' failed
** (<unknown>:668): CRITICAL **: file fonts.c:
line 1182
(pango_font_metrics_unref): assertion `metrics != NULL' failed
** (<unknown>:668): CRITICAL **: file pango-fontmap.c: line 126
(pango_font_map_load_fontset): assertion
`pango_font_description_get_family (desc) != NULL' failed
**
(<unknown>:668): CRITICAL **: file pango-fontset.c: line 101
(pango_fontset_get_metrics): assertion `fontset != NULL' failed
(<unknown>:668): GLib-GObject-CRITICAL **: file gobject.c: line
1337
(g_object_unref): assertion `G_IS_OBJECT (object)' failed
**
(<unknown>:668): CRITICAL **: file fonts.c: line 1206
(pango_font_metrics_get_ascent): assertion `metrics != NULL' failed
** (<unknown>:668): CRITICAL **: file fonts.c: line 1226
(pango_font_metrics_get_descent): assertion `metrics != NULL' failed
** (<unknown>:668): CRITICAL **: file fonts.c: line 1245
(pango_font_metrics_get_approximate_char_width): assertion `metrics !=
NULL' failed
** (<unknown>:668): CRITICAL **: file fonts.c:
line 1182
(pango_font_metrics_unref): assertion `metrics != NULL' failed
An unexpected exception has been detected in native code outside the
VM.
Unexpected Signal : 11 occurred at PC=0x400E49DF
Function=strlen+0xF
Library=/lib/libc.so.6
Current Java
thread:
at
org.eclipse.swt.internal.gtk.OS.pango_context_get_metrics(Native
Method)
- locked <0x4831db20> (a java.lang.Class)
at
org.eclipse.swt.graphics.GC.getFontMetrics(GC.java:1472)
at ....
and Sun's VM (1.4.2)
produce a core file ...
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