[Bug 33384] Basic WPF applications using .NET 3.5 WPF fails to handle images (windowscodecs {7543696a-bc8d-46b0-5f81-8d95728972be} = IMILBitmapSource unsupported)

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=33384

--- Comment #16 from Anastasius Focht <focht at gmx.net> 2013-04-19 06:03:51 CDT ---
Hello folks,

a bit more info...

The caller code of current crash (with v2 patch):

--- snip ---
Wine-dbg>disas 0x54040560 
0x54040560: pushl    %esi
0x54040561: movl    0x2c(%ecx),%esi
0x54040564: testl    %esi,%esi
0x54040566: jz    0x5404056e
0x54040568: movl    0x0(%esi),%eax
0x5404056a: pushl    %esi
0x5404056b: call    *0x4(%eax)
0x5404056e: movl    0x8(%ebp),%eax
0x54040571: movl    %esi,0x0(%eax)
0x54040573: xorl    %eax,%eax

Wine-dbg>info reg
Register dump:
 CS:0023 SS:002b DS:002b ES:002b FS:0063 GS:006b
 EIP:5404056b ESP:0495e588 EBP:0495e590 EFLAGS:00010202(  R- --  I   - - - )
 EAX:00000005 EBX:00000000 ECX:04a08048 EDX:54009440
 ESI:00200c4c EDI:0495e5bc
--- snip ---

Looks like interface/vtable method calling code again.
"eax" has a strange value which is read from "[esi]".

Dumping the memory around "esi" shows an interesting thing:

--- snip ---
Wine-dbg>x/10x $esi-20
0x00200c38:  00000068 00455355 7cbf61c0 7cbf61e4
0x00200c48:  7cbf6180 00000005 00000000 00000000
0x00200c58:  00000000 049a8038
--- snip ---

"00455355" looks familar? Yes, heap magic.
Resolving all other values shows this is indeed our BitmapImpl.

--- snip ---
00200c38   00000068  ; block size
00200c3c   00455355  ; "USE" heap magic
00200c40   7cc2b1c0  ; windowscodecs.IMILBitmapImpl_Vtbl
00200c44   7cc2b1e4  ; windowscodecs.IMILUnknown1Impl_Vtbl
00200c48   7cc2b180  ; windowscodecs.BitmapImpl_Vtbl
00200c4c   00000005  ; ref (refcount)
00200c50   00000000
--- snip ---

It seems the WPF code has knowledge of the underlying WIC/MIL bitmap object
implementation and tries to directly access the member(s).
Because Wine's BitmapImpl has a different layout, the "refcount" is mistaken as
interface/vtable pointer.

Regards

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