Public bug reported:
If I run scrot 1.4-1 to take a screenshot from a MicroVAX with a QDSS display
device running ULTRIX 4.5, I get:
X Error of failed request: BadValue (integer parameter out of range for
operation)
Major opcode of failed request: 91 (X_QueryColors)
Value in failed request: 0xff
Serial number of failed request: 23
Current serial number in output stream: 23
The QDSS is an 8 bit PseudoColor device, but it only has 254 available colormap
entries, not 256. Here is a fragment from xdpyinfo:
visual:
visual id: 0x23
class: PseudoColor
depth: 8 planes
available colormap entries: 254
red, green, blue masks: 0x0, 0x0, 0x0
significant bits in color specification: 8 bits
The problem is that in __imlib_GrabDrawableToRGBA(), imlib2 ignores the
number of colormap entries and instead does XQueryColors() for all 256
entries, based on the 8 bit depth. The hardware does actually have 256
entries, but the last two are reserved for the hardware cursor, and so
the X server denies this XQueryColors() request. The attached patch
instead only queries the number of colormap entries based on the visual,
and sets the rest of the entries to zero.
ProblemType: Bug
DistroRelease: Ubuntu 20.10
Package: libimlib2 1.6.1-2
ProcVersionSignature: Ubuntu 5.8.0-25.26-generic 5.8.14
Uname: Linux 5.8.0-25-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu50
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: XFCE
Date: Tue Nov 10 10:04:44 2020
SourcePackage: imlib2
UpgradeStatus: Upgraded to groovy on 2020-10-22 (19 days ago)
** Affects: imlib2 (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug groovy
** Patch added: "Fix for this issue"
https://bugs.launchpad.net/bugs/1903728/+attachment/5433042/+files/map_entries_not_depth.patch
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https://bugs.launchpad.net/bugs/1903728
Title:
Number of X colormap entries may be less than 1 << depth
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