[Poppler-bugs] [Bug 71177] New: "In pixman_region32_init_rect: Invalid rectangle passed" when viewing a certain PDF

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=71177

          Priority: medium
            Bug ID: 71177
          Assignee: poppler-bugs at lists.freedesktop.org
           Summary: "In pixman_region32_init_rect: Invalid rectangle
                    passed" when viewing a certain PDF
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: gpoo at gnome.org
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: glib frontend
           Product: poppler

>From Evince: https://bugzilla.gnome.org/show_bug.cgi?id=706567

A summary of the comments:

----------------
When viewing the attached PDF and scrolling to the end, evince shows the
following warnings on the console (but continues to function properly without
apparent rendering issues):
{{{
*** BUG ***
In pixman_region32_init_rect: Invalid rectangle passed
Set a breakpoint on '_pixman_log_error' to debug

*** BUG ***
In pixman_region32_init_rect: Invalid rectangle passed
Set a breakpoint on '_pixman_log_error' to debug
}}}

A PDF test case (8.8MB) is in
http://media.zweitausendeins.de/download/?pdf/merkheft/271%2FMH271_interaktiv.pdf

-----------------
The ouput of gdb shows a corrupted rectangle:

$2 = {extents = {x1 = 501, y1 = 479, x2 = 483, y2 = 504}, data = 0x7bae00}
(gdb) print *region->data
$3 = {size = 8105376, numRects = 8106176}
(gdb) print region->data
$4 = (pixman_region32_data_t *) 0x7bae00
(gdb) print *(region->data)
$5 = {size = 8105376, numRects = 8106176}

-----------------
Finally Carlos said:

It's a poppler bug actually that is giving us incorrect rectangles as selection
region. That document is a challenge for poppler, it contains vertical text and
even inclined text. Poppler doesn't support it, it assumes that all characters
in a line are at the same yMin - yMax range. So, there are several approaches
to solve/workaround the issue. We can check rectangles are valid in evince and
ignore the invalid ones, maybe showing a warning, but I think it would be
better to do it in poppler, either poppler glib or directly in TextOutputDev.

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