Subversion Repositories filter_foundry

Windows NT 3.1 compatibility problems
-------------------------------------

Fixed problems:
---------------

- `GetEnvironmentStringsA` and `FreeEnvironmentStrings` not found in WinAPI.

        Fixed: The CLib of OpenWatcom 1.9 imports these two functions.
        OpenWatcom 2.0 (beta nov 1 2017) calls these functions dynamically and is therefore compatible with Windows NT 3.1.

- `CreateDIBSection` not found in WinAPI

        Fixed in SVN Revision 407 (removed because not required).

- `GetVersionEx` not found in WinAPI.

        Fixed in SVN Revision 411 (calling dynamically now).

- `RegisterClassExA` and `GetClassInfoExA` not found in WinAPI.

        Fixed in SVN Revision 412 (replaced by `RegisterClassA` and `GetClassInfoA`).

Open problems:
--------------

- WinNT311: "msctls_trackbar32" is not supported by Windows NT 3.1. DialogBoxParamA crashes with the confusing error code "Invalid Cursor Handle".
        Note: msctls_trackbar32 seems to be defined in COMCTL32.DLL, but Win NT 3.1 has no REGSVR32.EXE, so there can't be any controls added??
        For now, we added an error message if the class can't be found (SVN Revision 413).
        Windows NT 3.51 has COMCTL32.DLL and works perfectly with the trackbars!

- WinNT311: `LoadImageA` not found in WinAPI of Windows NT 3.1 (this is the last unresolved import!) ... how should we draw it? Filter Factory uses DrawIcon on a BUTTON control (BS_OWNERDRAW | WS_CHILD | WS_CLIPSIBLINGS).
        Remove "Hand Question" cursor in order to use the "Static" class instead of the custom class "CautionIcon"?
        Windows NT 3.51 has `LoadImageA` and works.
        TODO: Make call dynamic, so that Windows NT 3.1 can show at least an error message instead of failing silently.

- If hand cursor is not existing in Windows, then use a handpointer located in the resources.

- WinNT311: Icons (+, - and exclamation sign) graphics are broken (probably need low colored icons?)

- Icons (+, - and exclamation sign) are drawn too big (Windows NT 3.1, and also Windows NT 3.51)
        They are STATIC with SS_ICON. It is probably automatically 32x32

- Windows NT 3.51 clicking the zoom icons does not work!
        The click event probably only works for Button classes?

- Help button does not work

- WinNT311+351: Preview image is not drawn at dialog box opening. You need to enter something first.

- WinNT311+351: Create 64 bit plugin: Error "Not a valid NT image" at `UpdateVersionInfoWithHandle` (probably doesn't support "Load as Datafile")

- Versioninfo is not adjusted, not even for Win 32 standalone plugins
        In Win NT 3.51, 32 bit is adjusted, 64 bit not

- WinNT351: Made standalone plugins won't load. It says that the image is invalid!
        It does load with Windows 10. (Check if the mixer has included the correct 32 bit plugin as base)

Questions:
----------

Which CPU architecture is required for OpenWatcom settings? Should we do very low settings 80386?