[Bug 24877] New: Baldur's Gate 1: Transparency rendering broken

http://bugs.winehq.org/show_bug.cgi?id=24877

Summary: Baldur's Gate 1: Transparency rendering broken
           Product: Wine
           Version: 1.3.5
          Platform: x86-64
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: directx-d3d
        AssignedTo: [e-mail]
        ReportedBy: [e-mail]

Created an attachment (id=31492)
 --> (http://bugs.winehq.org/attachment.cgi?id=31492)
screenshot showing the transparent cursor problem

Things with transparency, like the mouse cursor in the menu, or the characters
over the landscape, are rendered badly:
* Mouse cursor: It is always surrounded by a black box, which is not redrawn
after moving the cursor away.
* Characters: Their background is replaced what seems to be parts of other
images/animations.

Additionally the game is very sluggish and slow, but that could be result of
the next thing:

This is accompanied by masses of this debug output on the console:
---
fixme:d3d_surface:surface_download_data Readback conversion not supported for
format WINED3DFMT_B5G6R5_UNORM.
fixme:d3d_surface:IWineD3DBaseSurfaceImpl_Blt Filters not supported in software
blit
---