In r8454, I have a applied a fix that allows this C++ exception to
correctly percolate to the Python side -- the user will still get an
exception, but it will be a Python exception and the interpreter itself
does not crash. (It used to work, but recent changes to CXX caused it
to break.) I have attached this patch to the e-mail.
As Eric suggests, fixing the underlying limitation (I even hesitate to
call it a bug because it is definitely a corner case) requires
understanding some pretty dark depths of the Agg renderer.
Mike
On 06/21/2010 10:57 PM, Eric Firing wrote:
On 06/21/2010 12:24 PM, Sandro Tosi wrote:
forwarded 585442 matplotlib-devel@lists.sourceforge.net
thanks
Hello Matplotlib developers,
here below is a report a user of maplotlib sent to the Debian bug
tracker. I've verified and it happend also with 0.99.3:
$ python -c "import matplotlib as p ; print p.__version__"
0.99.3
$ python mpl_crash.py
terminate called after throwing an instance of 'char const*'
Aborted
Thanks for looking into it,
Sandro
Sandro,
Thanks for reporting it.
With the default interpolation, rendering gets extremely slow as the
view limits decline to and below a single image pixel. I suspect the
crash is related to this. Neither the slowdown nor the crash occurs
with interpolation='nearest', although there is still an anomaly in
which the image is blank when the viewlim region is too small.
Like Ryan, I am not familiar with the _image.cpp and the underlying agg
routines, but I suspect this is going to be a difficult problem to
solve. It may be necessary to put in some workaround, trying to trap
and prevent the extreme slowdown and crash. The slowdown topic came up
on the list years ago.
http://www.mail-archive.com/matplotlib-devel@lists.sourceforge.net/msg00513.html
Eric
On Thu, Jun 10, 2010 at 16:52, Teemu Ikonen<tpiko...@gmail.com> wrote:
Package: python-matplotlib
Version: 0.99.1.2-3
Severity: important
Running a program which displays an image with plt.imshow() and changes the
axes with plt.axis() before calling plt.show() crashes the python interpreter:
$ python mpl_crash.py
terminate called after throwing an instance of 'char const*'
Aborted
This happens at least with Qt4Agg, GTKAgg and TKAgg backends.
The example program is attached.
Best,
Teemu
-- System Information:
Debian Release: squeeze/sid
APT prefers testing
APT policy: (500, 'testing')
Architecture: amd64 (x86_64)
Kernel: Linux 2.6.32-trunk-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Versions of packages python-matplotlib depends on:
ii libatk1.0-0 1.30.0-1 The ATK accessibility toolkit
ii libc6 2.10.2-9 Embedded GNU C Library: Shared lib
ii libcairo2 1.8.10-4 The Cairo 2D vector graphics libra
ii libfontconfig1 2.8.0-2.1 generic font configuration library
ii libfreetype6 2.3.11-1 FreeType 2 font engine, shared lib
ii libgcc1 1:4.4.4-1 GCC support library
ii libglib2.0-0 2.24.1-1 The GLib library of C routines
ii libgtk2.0-0 2.20.1-1 The GTK+ graphical user interface
ii libpango1.0-0 1.28.0-1 Layout and rendering of internatio
ii libpng12-0 1.2.43-1 PNG library - runtime
ii libstdc++6 4.4.4-1 The GNU Standard C++ Library v3
ii python 2.5.4-9 An interactive high-level object-o
ii python-cairo 1.8.8-1+b1 Python bindings for the Cairo vect
ii python-dateutil 1.4.1-3 powerful extensions to the standar
ii python-gobject 2.21.1-1 Python bindings for the GObject li
ii python-matplotlib-data 0.99.1.2-3 Python based plotting system (data
ii python-numpy 1:1.3.0-3+b1 Numerical Python adds a fast array
ii python-pyparsing 1.5.2-2 Python parsing module
ii python-support 1.0.8 automated rebuilding support for P
ii python-tz 2010b-1 Python version of the Olson timezo
ii tcl8.5 8.5.8-2 Tcl (the Tool Command Language) v8
ii tk8.5 8.5.8-1 Tk toolkit for Tcl and X11, v8.5 -
ii zlib1g 1:1.2.3.4.dfsg-3 compression library - runtime
Versions of packages python-matplotlib recommends:
ii python-glade2 2.17.0-2 GTK+ bindings: Glade support
ii python-tk 2.6.5-1 Tkinter - Writing Tk applications
Versions of packages python-matplotlib suggests:
ii dvipng 1.13-1 convert DVI files to PNG graphics
ii ipython 0.10-2 enhanced interactive Python shell
ii librsvg2-common 2.26.3-1 SAX-based renderer library for SVG
ii python-configobj 4.7.2+ds-1 simple but powerful config file re
pn python-excelerator<none> (no description available)
ii python-gtk2 2.17.0-2 Python bindings for the GTK+ widge
pn python-matplotlib-doc<none> (no description available)
pn python-qt3<none> (no description available)
ii python-qt4 4.7.3-1 Python bindings for Qt4
ii python-scipy 0.7.2-1 scientific tools for Python
ii python-traits 3.3.0-1 Manifest typing and reactive progr
ii python-wxgtk2.8 2.8.10.1-3 wxWidgets Cross-platform C++ GUI t
ii texlive-extra-utils 2009-7 TeX Live: TeX auxiliary programs
ii texlive-latex-extra 2009-7 TeX Live: LaTeX supplementary pack
-- no debconf information
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Michael Droettboom
Science Software Branch
Space Telescope Science Institute
Baltimore, Maryland, USA
--- Begin Message ---
Revision: 8454
http://matplotlib.svn.sourceforge.net/matplotlib/?rev=8454&view=rev
Author: mdboom
Date: 2010-06-22 16:00:55 +0000 (Tue, 22 Jun 2010)
Log Message:
-----------
Debian Bug#585442: python-matplotlib: crashes when calling axis() after imshow()
This allows the C++ exception raised when Agg rendering complexity is exceeded
to percolate up correctly to a Python exception, rather than crashing the
interpreter.
Modified Paths:
--------------
trunk/matplotlib/agg24/include/agg_rasterizer_cells_aa.h
Modified: trunk/matplotlib/agg24/include/agg_rasterizer_cells_aa.h
===================================================================
--- trunk/matplotlib/agg24/include/agg_rasterizer_cells_aa.h 2010-06-21
21:41:19 UTC (rev 8453)
+++ trunk/matplotlib/agg24/include/agg_rasterizer_cells_aa.h 2010-06-22
16:00:55 UTC (rev 8454)
@@ -29,16 +29,15 @@
#ifndef AGG_RASTERIZER_CELLS_AA_INCLUDED
#define AGG_RASTERIZER_CELLS_AA_INCLUDED
+#include "CXX/Exception.hxx"
#include <exception>
#include <string.h>
#include <math.h>
#include "agg_math.h"
#include "agg_array.h"
-
namespace agg
{
-
//-----------------------------------------------------rasterizer_cells_aa
// An internal class that implements the main rasterization algorithm.
// Used in the rasterizer. Should not be used direcly.
@@ -180,6 +179,11 @@
template<class Cell>
AGG_INLINE void rasterizer_cells_aa<Cell>::add_curr_cell()
{
+ static Py::Exception e(
+ Py::OverflowError(
+ "Agg rendering complexity exceeded. Consider downsampling or
decimating your data."));
+
+
if(m_curr_cell.area | m_curr_cell.cover)
{
if((m_num_cells & cell_block_mask) == 0)
@@ -187,8 +191,7 @@
if(m_num_blocks >= cell_block_limit) {
/* If this exception is thrown too often, one can
increase cell_block_limit */
- throw "Agg rendering complexity exceeded. "
- "Consider downsampling or decimating your data.";
+ throw e;
}
allocate_block();
}
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world's largest Open Source development site.
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