[Bug 11203] Versions 9.52 & 9.53 throw page exception on Enterprise Architect

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=11203

--- Comment #54 from Ian Goddard <iang at austonley.org.uk> 2012-11-27 12:03:14 CST ---
I don't know.  I've stuck with 1.0.1 hacked to remove what I consider to be a
bug & the devs seemed to consider a feature (see the comments from Aug 2009).

The problem seems to be a deliberate design decision: to assume that a graphic
driver which reports only 24-bit capability can, in fact, handle 32 bits & to
act on that assumption in the interest of running games.  If an application
then sends a 24-bit image the program will crash.  I have had several boards
with 24-bit drivers and that assumption has been false for all of them. 

Last time I looked - about a year ago - the code had been substantially changed
but was still based on that assumption.  Until that decision is rescinded the
problem will remain.  If it is rescinded the change required will be trivial.

It did seem to me quite feasible to add a switch in the registry so that the
assumption could be applied or not depending on the H/W; I'd have been prepared
to code it myself on the original version of the code.  However I gained the
impression that supporting Intel graphics wasn't of interest to the project
and, having a quick hack that works, I don't need a more elaborate version
myself.

I agree that last time I checked against a more recent Wine build 9.x builds of
EA were OK but this is a feature of later EA builds,, not of Wine.  As comment
53 from A L-H shows the problem is still there with the original EA.  However
there were duplicate bug reports against various other applications (VB was one
IIRC) it may still be a problem for some Wine users who have different
requirements.

I only have that one application which needs Wine.  Although the current
version of that no longer has a problem I've stuck with what already works for
me: 1.0.1 with a one line change.  I have long since stopped testing any more
recent builds of Wine.  I'd be happy retest if & when the devs decide to
revisit the issue.

At present the code supports the following use case:

A board which reports 24bpp but can handle 32 is used to run an application
which insists on having 32bpp.

The use case which fails is:

A board which reports 24bpp and can't handle 32 is used to run an application
which will fall back to 24bpp if that's what's reported but will attempt to use
32 if that's reported.

How prevalent are these two use cases?  At present the 2nd is being sacrificed
to support the 1st.  If the 1st isn't valid then I suggest a trivial code
change to report 24bpp back to the application.  Otherwise, make a decision to
either add a registry switch to support both of them or mark as won't fix.

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