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- Microsoft WinG - Beta release - June 27, 1994
- -------------------------------------------------
- This file describes known bugs, gotchas, and helpful hints for the WinG
- Beta release. Please remember that this is a beta version and is
- subject to the usual Beta Disclaimers.
-
-
- Reporting Bugs
- --------------
- The main goal of this Beta release, in addition to providing you with
- a solid foundation for writing great graphics-intensive Windows
- applications, is to flush out compatibility problems with WinG. We
- want to know when you encounter bugs, and want to hear suggestions
- and/or recommendations you have about WinG or its support files.
-
- With this in mind, we have included WINGBUG.EXE in the WinG Beta
- Development Kit (in the BIN directory of the SDK), an automated tool for
- gathering information on your configuration for reporting bugs to the
- WinG development team. This tool creates a complete bug report by
- prompting you for information about the bug, your configuration,
- and the steps used to reproduce the bug. The resulting bug
- report text file should be sent to the wingbug@microsoft.com
- address, or sent to Microsoft on floppy disk.
-
- Before reporting a bug, please be sure that it's not one we already
- know about by looking through the Known Bugs and Limitations section
- below. If there is any doubt, send the bug anyway--it's better to have a
- duplicate bug on file than not know about one.
-
- Known Bugs And Limitations
- --------------------------
- The following are known problems with the beta version of WinG.
-
- These bugs and design decisions will be fixed or resolved before the final
- release. Their presence here serves only as a warning to programmers
- coding for this release.
-
- - WinGBitmaps must be created with full 256 entry color tables.
-
- - WinG will assert on 8bpp non-palette devices, like the ATI Mach32 8bpp
- non-palette mode.
-
- - CMACRO32.INC from the doggie sample application requires Microsoft MASM
- 5.1 to compile. You must specify the /NOPACKCODE option when linking
- segments produced with CMACRO32.INC.
-
- - Calling WinGStretchBlt and WinGBitBlt with source coordinates outside
- of the source boundary can crash WinG.
-
- - WinGBitBlt and WinGStretchBlt only support bltting from WinGDCs to the
- screen.
-
- - Several GDI APIs that should work into WinGDCs don't right now. If
- you discover others not on this list we'd appreciate hearing about them.
-
- StrechDIBits with non-1:1 ratio screws up
- hatched brushes sometimes draw incorrectly
- FloodFill with a NULL brush draws incorrectly
- FloodFill outside of the bounds of a WinGBitmap can flood the
- whole image
- PALETTERGBs may map differently when compared to the display
- brushes created with CreatePatternBrush fault when selected
- some drawing operations draw slightly differently than standard GDI
- DrawIcon will crash
- WinGDCs will incorrectly map non-exact matchs in the color-table
-
- - You cannot change the origin of halftone brushes.
-
- - The sample programs's makefiles are named sample.mk (where sample is
- the name of the sample) instead of makefile because of limitations
- with Microsoft Setup.
-
- - Some GP Faults within the SVGA256.DRV driver have been found. If
- you encounter one, please use WINGBUG.EXE and send mail to
- wingbug@microsoft.com.
-
- - WinG does not unload when a GP Fault occurs. For accurate
- performance, be sure to unload WinG.DLL or reboot Windows after a
- GP Fault in a WinG application.
-
- - WinGBitBlt and WinGStretchBlt sometimes have trouble clipping to
- non-rectangular clipping regions. If you encounter incorrect
- behavior, please use WINGBUG.EXE and send mail to
- wingbug@microsoft.com.
-
- - 16-bit WinG applications will not run on Daytona Beta 1 (build 612).
- You must have Daytona Beta 2 (build 683) to use 16-bit WinG
- applications under Windows NT. 32-bit WinG applications will run on
- all versions of Daytona.
-
- - Noticeable timing differences have been found while running the
- WinG profiler on a computer connected to a network. For accurate
- results, disconnect your computer from the network the first time you
- run a WinG application. After the profile is complete, you can plug the
- net in again.
-
- A Note on Speed
- ---------------
- WinG is designed to be the absolute fastest way to blt DIBs under
- Windows. The goal is to blt at memory bandwidth to the display device.
- In other words, we are competing with BitBlt and DOS blts, not
- StretchDIBits or SetDIBitsToDevice.
-
- On most 8bpp devices, if you use the recommended DIB format (returned
- by WinGRecommendDIBFormat) you should get speeds comparable to BitBlt,
- and much faster than StretchDIBits. The timewing sample application
- will show you various blt speeds on your display.
-
- The only time WinG (in its final release) will not be able to beat or
- match BitBlt is on some "device bitmap" drivers. These are drivers that
- keep HBITMAPs in video ram and use the display hardware to copy to the
- screen at much higher speeds than one can copy from main memory.
-
- If you run timewing and the WinGStretchBlt performance is not as good or
- better than the StretchBlt case and is not much faster than the StretchDIBits
- case, please use WINGBUG.EXE and send a bug report to
- wingbug@microsoft.com. We treat performance problems as priority 1 bugs.
- After all, if it's not fast it's not worth using.
-
- Thanks a lot for your participation in the WinG Beta program!
-