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+***************************************************************************
+* *
+* Project: RiscOS *
+* *
+* Module: Wimp *
+* *
+* Created: Wed 24-Oct-90 By: Ran Mokady *
+* *
+* First version: 2.80 *
+* *
+* Copyright: (C) 1990, Acorn Computers Ltd., Cambridge, England. *
+* *
+***************************************************************************
+
+Purpose:
+========
+
+The WIMP.
+
+***************************************************************************
+
+
+Change Log:
+===========
+
+Version 2.01
+ * Pending slot is now scanned on screen remapping
+
+Version 2.02
+ * Wimp objects to > 256 pages, not >= 256
+
+Version 2.03
+ * Message block too small is now checked for
+
+Version 2.04
+ * Up-to-date value of CAOPointer is now read in OS_ChangeDynamic
+ - don't store CAOPointer in Service_NewApplication
+ - don't overwrite CAOPointer in Wimp_Initialise
+
+Version 2.05
+ * Doesn't give address exception if 0 pages on startup any more
+
+Version 2.06
+ * Wimp_ReportError <escape> now returns R1=1 or 2 as appropriate
+
+Version 2.07
+ * Enable interrupts in Service_MemoryMoved (MOS bug)
+
+Version 2.08
+ * Implement 2-way scrolling (drag_scrollboth)
+
+Version 2.09
+ * Errors in Wimp_Poll are reported internally
+ * Disables escape conditions explicitly when Wimp_Poll is called
+
+Version 2.10
+ * Remember pointer position over a mode change
+ * Use separate buffers for errors and starttask
+ (Problems if task causes an upcall)
+ * Report error if window deleted while dragging
+ * Stop dragging menu / dbox if menus closed
+ * *Help WimpSlot message altered slightly
+ * Move dynamic error block up 4 bytes
+ (It's overlaid on the error handler's buffer!)
+ * Ensure that Wimp_CreateMenu can return an error
+ * Check for errors while creating menu icons
+ * Delete menu window if error while creating icons
+ * Correct behaviour of caret / menu selection
+
+Version 2.11
+ * Switch off pointer during 2-D scrolling
+
+Version 2.12
+ * Return child's task handle from Wimp_StartTask (0 if dead)
+
+Version 2.13
+ * Issue Open_Window_Requests after a mode change later on (ie. on the next
+ call to Wimp_Poll). This allows the window structure to be rearranged
+ on receipt of the Mode_Change message.
+
+Version 2.14
+ * Bugfix to the above: a copy of the window list is made, in case
+ 'backdrop' windows cause the window ordering to change, and the
+ background and iconbar windows are opened before the Mode_Change message
+ is returned, for compatibility.
+
+Version 2.15
+ * Pointer readjustment when dragged window's extent changes is now fixed
+ properly (eg. when dragging Filer windows around, the pointer remains
+ over the resize box as it should).
+
+Version 2.16
+ * WimpFlags CMOS bit 5 set => windows are allowed to go off the
+ bottom-right of the screen when being dragged by the title bar and when
+ Wimp_OpenWindow is called on them, unless bit 13 of the window flags is
+ set. Bit 14 of the window flags acts similarly, but is cancelled after
+ the next call to Wimp_OpenWindow relating to that window.
+ * Menus automatically have bit 13 of their windowflags set, as well as
+ dboxes (ie. windows which are opened using Wimp_CreateMenu or
+ Wimp_CreateSubMenu).
+ * When a window is toggled to full size, or when it is being reopened
+ because a mode change has occurred, the Wimp sets bit 14 of the window
+ flags first (so the next Wimp_OpenWindow will cause it to be kept on the
+ screen).
+ * Window extent supplied in Wimp_CreateWindow and Wimp_SetExtent is
+ automatically rounded to pixels by the Wimp.
+ * Double-click with different buttons is not allowed any more
+ * Fix bug: iconbar scrolls if the pointer is moved over either end, even
+ if a drag is in progress at the time
+
+Version 2.17
+ * Fix bug: scroll bar dragging when window is partly off-screen
+ * Change pointer shape during double-click period
+ * Cancel double-click as soon as ptr moves away
+ * Cancel double-click if Wimp_DragBox is called
+
+Version 2.18
+ * Fix bug: double-click ptr was not reset if shape <> 1
+ * If the menu-owning application knows about Wimp 2.18 (ie.
+ Wimp_Initialise was called with R0 >= 218, R1 = "TASK"), then messages
+ destined for menu windows are forwarded to the menu owner task.
+ * Wimp_GetMenuState can be called to determine the current state of the
+ menu tree (null tree if you are not the menu owner). It can also
+ determine the menu tree corresponding to a given window/icon if the
+ window is a menu or an open dialogue box.
+
+Version 2.19
+ * Increase drag timeout period from 0.2 seconds to 0.5 seconds
+ * Report a drag button event immediately if the button is held down and
+ the mouse is moved by 16 OS units or more (as for double-click
+ cancellation).
+
+Version 2.20
+ * Mode_Change message and reopen-window messages are only sent after a
+ mode change if an old-style task was not active when the call to
+ Wimp_SetMode was made, or at any time after that prior to the next
+ Wimp_Poll. This is so that old-style tasks do not get new-style windows
+ being reopened on top of them, if they execute Wimp_SetMode in their
+ !Run sequence (some programs such as !Delta execute Wimp_SetMode (R0=12)
+ to try to get the RISC OS Wimp to behave in a more compatible way with
+ the Arthur 1.20 version).
+ * Wimp_SetMode is now allowed while a command window is pending, without
+ activating it, and if the command window was already active before the
+ mode change, a VDU 4 is executed afterwards (to keep the text visible).
+ * *Wimp_SetMode <number> now causes SWI XWimp_SetMode to be called with
+ the number supplied. This command can be put into !Run files by users
+ for convenience (eg. if they prefer a certain package to work in a
+ particular mode). The default !Run files of packages should not cause
+ the mode to change.
+
+Version 2.21
+ * New parameters to Wimp_CreateIcon allowed:
+ [R1,#0] = -3 => create icon on iconbar to left of icon handle R0
+ -4 => create icon on iconbar to right of icon handle R0
+ R0 = handle of icon to open next to, if [R1,#0] = -3 or -4
+ R0 = -1 => create icon at extreme left (-3) or right (-4)
+ This allows icons to be recreated and deleted (in order to change their
+ width, for example) such that they stay in the same relative position on the
+ iconbar.
+
+Version 2.22
+ * BUG FIX: Wimp 2.21 preserves R10 (handle) over calls to 'openiconbar',
+ which means that the value of 'handle' is not set up correctly for the
+ next call to 'recalcposns' after a mode change. This in turn results in
+ OS memory being scrambled, and address exceptions occurring etc.
+
+Version 2.23
+ * If application sets R0 >= 223 when calling Wimp_Initialise, then
+ Wimp_Poll or Wimp_PollIdle with R0 bit 13 clear, bit 22 set => R3 ->
+ poll word (must NOT be in application space). If R0 bit 23 is also set,
+ then the word is scanned by the Wimp at the start of the Wimp_Poll loop;
+ otherwise it is not scanned until just before the Wimp is about to read
+ the mouse (ie. after all messages have been delivered and
+ Redraw_Window_Requests sent). If the Wimp finds that the word is
+ non-zero, then it will return R0=13 from Wimp_Poll, with [R1,#0] =
+ address of poll word, [R1,#4] = contents.
+
+Version 2.24
+ * Fix bug: the above stuff did not work for Wimp_PollIdle (the error "Bad
+ parameter passed to Wimp in R0" was returned, even if no bits above bit
+ 23 were set in R0.
+
+Version 2.25
+ * "*Wimp_SetMode" command changed to "*WimpMode".
+
+Version 2.26
+ * Wimp automatically sets bit 14 of window flags on Wimp_CreateWindow and
+ Wimp_SetExtent. This forces new windows to be initially on-screen, but
+ allows them to be dragged off subsequently.
+
+Version 2.27
+ * Menus and dboxes now get bit 14 set, rather than bit 13. This allows
+ them to be dragged off-screen after initial opening.
+
+Version 2.28
+ * Bit 7 of R1 set on entry to Wimp_ReportError suppresses the 'beep' that
+ would normally occur if bit 4 of the WimpFlags was clear.
+
+Version 2.29
+ * Drag movement limit increased from 16 to 32 OS units.
+
+Version 2.30
+ * Double-click movement limit increased from 16 to 32 OS units.
+ * Extra sprites added: file_fea and small_fea.
+
+Version 2.31
+ * Sprites taken out of Wimp and put into Desktop module
+ * Also spots when the Desktop module dies or re-inits
+
+Version 2.32
+ * Don't give error on initialisation if ROM sprites can't be found
+
+Version 2.33
+ * Fix problem with *WimpPalette opening the command window
+ * Fix syntax message for *WimpMode <n>
+
+Version 2.34
+ * Make *IconSprites look for <file>23 if in mono mode
+ * Pick up DeskFS:$.Sprites or DeskFS:$.Sprites23 for ROM sprite area
+ * Add Wimp_ReadSysInfo R0=1 => R0=current Wimp mode
+
+Version 2.35
+ * Fix bug: OpenWindowRequest messages should always be dealt with by the
+ Wimp, rather than going to the menu owner (even if he says he knows
+ about recent Wimps).
+
+Version 2.36
+ * Message_ModeChange, and window re-opening, is only performed after
+ Wimp_SetMode if the new mode is different from the last mode for which a
+ message was returned.
+ * Iconbar doesn't scroll on a mode change
+ * Escape in a Wimp_ReportError box causes the non-highlighted box to be
+ selected, or the only box if it is highlighted. Any other key selects
+ the highlighted box, or the only box if it isn't highlighted.
+ * Maximum number of created windows increased to 256
+ * "Bad Wimp mode" error returned for Wimp_SetMode to double-pixel modes
+
+Version 2.37
+ * If R0 >= 223 on Wimp_Initialise, then Wimp_Poll(Idle) with bit 24 set =>
+ save / restore FP registers.
+
+Version 2.38
+ * Window flags bit 14 (force onto screen once only) moved to bit 21
+ * Window flags bit 14 set => drag ignores extent x1
+ * Window flags bit 15 set => drag ignores extent y0
+
+Version 2.39
+ * Use double-width VDU-5 caret if pixel width <= 2 OS units
+ * Use double-width font caret if caret height > 12 pixel-widths
+
+Version 2.40
+ * Fix bug: don't re-open backdrop and iconbar if same mode
+
+Version 2.41
+ * Fix bug: the following calls should accept window -2:
+ Wimp_GetWindowState Wimp_GetWindowInfo
+ Wimp_GetWindowOutline Wimp_ForceRedraw
+ Wimp_DragBox Wimp_WhichIcon
+ * Caret made single-width again
+ * Free pool converted to words, so > 256 pages are allowed
+
+Version 2.42
+ * Default action of f11 is to toggle the iconbar between front and back
+
+Version 2.43
+ * Fix bug: Wimp_ForceRedraw with handle -2 didn't redraw the iconbar
+
+Version 2.44
+ * *WimpMode <n> doesn't do anything if mode is already current.
+
+Version 2.45
+ * Change f11 behaviour to toggle the 'back' bit of the iconbar
+ * Wimp_GetWindowInfo now accepts R1 bit 0 set => don't return the icon
+ definitions (ie. just return the window header). R1 bits 0..1 are
+ cleared before R1 is used as a pointer.
+ * Wimp_LoadTemplate now accepts R1<=0 => just return R1 = size of buffer
+ required, R2 = size of indirected data
+
+Version 2.46
+ * Fix bug: Wimp_LoadTemplate mustn't check for R1 >= &8000.
+
+Version 2.47
+ * Make Wimp_OpenWindow prevent windows getting bigger than the screen size
+ even if they're not being forced onto the screen.
+
+Version 2.48
+ * If ptr_default sprite has its own palette, don't use Wimp palette
+ on mode change.
+
+Version 2.49
+ * Ignore clicks on greyed-out menu items
+ * Return Message_MenusDeleted if menus deleted
+ * Return mouse clicks via messages if message queue non-empty
+
+Version 2.50
+ * Look at ModeFlags HiResMono bit rather than Log2BPP = 0 to decide
+ whether to use DeskFS:$.Sprites or DeskFS:$.Sprites23 when Wimp starts
+ up, and whether to look for <name>23 in *IconSprites.
+ * Wimp_OpenWindow forces the window on screen if it was previously closed.
+
+Version 2.51
+ * Make menu disappear if SELECT clicked on grey item
+
+Version 2.52
+ * Allow interactive help to 'see' greyed-out menu items
+ * Setting menu flags bit 4 allows you to see submenus of grey items.
+
+Version 2.53
+ * Issue Service_WimpPalette on Wimp_SetPalette
+ * Return R2 = sender's task handle from Wimp_Poll(Idle) if task knows
+ about Wimp 2.53.
+
+Version 2.54
+ * Fix bugs: Call int_sendmessage_fromwimp rather than int_sendmessage to
+ give taskhandle 0 on return from Wimp_Poll.
+
+Version 2.55
+ * Fix bug: *Iconsprites in mode 23 used wrong R2, giving "Bad file name ''".
+
+Version 2.56
+ * Issue Message_MenusDeleted when escape kills menus
+
+Version 2.57
+ * *IconSprites tries <filename>20 if <= 2 OS units per ypix
+
+Version 2.58
+ * *IconSprites tries <filename><x><y><bpp>, then <filename>
+ It also uses the values cached on startup
+ * Wimp_ReadSysInfo (2) returns ptr to xeig,yeig,log2bpp
+
+Version 2.59
+ * *WimpTask works from a dead task, by entering the Wimp as an
+ application, initialising and then doing the SWI Wimp_StartTask. It
+ then exits via OS_Exit.
+
+Version 2.60
+ * *IconSprites now puts <x><y> or "23" on the end of the filename.
+ * Wimp_ReadSysInfo (2) returns ptr to suffix
+
+Version 2.61
+ * Implement Wimp$State ("desktop" or "commands")
+ * Wimp_ReadSysInfo (3) returns state of commandflag
+
+Version 2.62
+ * Wimp_ReadSysInfo (3) returns 0=commands, 1=desktop
+ * f11 causes iconbar to come to front if covered, and to the back
+ otherwise. When coming to the front, the backwindow bit is cleared, and
+ when going to the back,it is set.
+
+Version 2.63
+ * Still send Message_ModeChange even if same mode, and still re-open
+ windows, but don't force windows onto screen u nless screen size smaller
+ in x or y.
+
+Version 2.64
+ * Fix FP register saving, and set status=&70000 if not saved
+ * Fix scrolled menu dotted line redrawing
+ * Don't send iconbar to back on mode change
+ * Use OS_CheckModeValid when checking for HiResMono modes initially
+ * Clear bottom bits of palette entries in Wimp_ReadPalette
+
+Version 2.65
+ * Don't send Message_SlotSize if slot is same size
+ * Report memory full errors in Wimp_SlotSize correctly
+ * Make OS_ChangeDynamicArea and findpages work with 16Mb
+ * Allow pointer to go off bottom-right in size dragging (this in fact
+ causes the window to expand in the other direction).
+ * Fix bug: don't zero bottom bytes in Wimp_ReadPalette
+ * Avoid 16-bit overflow when setting the pointer bounding box. This gets
+ round a problem with unbounded windows with extent > 2^16, where the
+ size drag bounds can be too big.
+
+Version 2.66
+ * Fix bug: Wimp_SlotSize corrupted R4 on exit!
+
+Version 2.67
+ * Fix bug: Wimp_LoadTemplate didn't count indirected data properly
+ * Fix bug: turn double-click ptr off if pending window deleted
+ * Fix bug: allow validation string pointer = 1 and indirected text size <=
+ 0 in templates. This allows for indirected sprite icons, where the
+ 'validation string' pointer is in fact the sprite area CB ptr (0 =>
+ system sprites, 1 => Wimp pool).
+
+Version 2.68
+ * Add "-next" parameter to *WimpSlot command
+ * Make "-min parameter to *WimpSlot optional
+
+Version 2.69
+ * Altered default Wimp palette so that the bottom two bits of R,G and B
+ are equal (for all but colour 8). This helps the Wimp and ColourTrans
+ to agree about the colours in 256-colour modes, and also results in
+ better matching colours from the Wimp.
+
+Version 2.70
+ * Changed to use ResourceFS
+ * Included resource files inside module
+ * Accesses resources via WindowManager$Path
+
+Version 2.71
+ * Implement *WimpWriteDir for changing to Hebrew mode
+ * Menus with title starting "\" are reversed
+ * Wimp_ReadSysInfo (4) returns current write direction
+
+Version 2.72
+ * Fix bug: didn't initialise ROM sprites if loaded after ResourceFS
+
+Version 2.73
+ * Added Wimp_CreateIcon window handles -5 to -8 (prioritised)
+
+Version 2.74
+ * Fix bug: iconbar extent should be pixel-aligned
+
+Version 2.75
+ * Fix bug: return click from menu icon if clicked as the mouse enters
+
+Version 2.76
+ * Icons stored separately from windows. This allows window structs to stay still.
+ * Pass reason code messages <= CloseRequest through the message system
+ under task ID 'pmiW' ("Wimp"), this enables mode change to send open
+ messages for all windows.
+ * Send messages for all windows being opened after a mode change, and stop
+ using the stack to hold the window stacking order for this operation.
+ * Implement infinite windows.
+ * Backwindow bit slightly changed in meaning: now, the frontmost back
+ window determines where windows opened behind window -2 get opened; if a
+ specific window handle is given, even if that window is behind a back
+ window, then the opened window will open behind the window specified.
+
+Version 2.77
+ * Handle rectangle area full redraw screen better.
+
+Version 2.78
+ * Fix bug: address exception when clicking on greyed-out menu item
+
+Version 2.79
+ * Iconize messages implemented.
+
+---------------------------------------------------------------------------
+
+Version: 2.80 Wed 24-Oct-90 Ran Mokady
+ * Fix bug, address exception when task died while pointer in one of
+ its windows.
+
+---------------------------------------------------------------------------
+
+Version: 2.84 Sun 28-Oct-90 Ran Mokady
+
+ * 2.81 Changed number of tasks to 128.
+
+ * 2.82 F11 action (Toggle iconbar) moved to F12.
+
+ * 2.83 Fixed bug, drag user sprite called move address first
+ now calls plot first.
+
+ * Centre error box on screen.
+ * Fixed bug in 3d writable icons, colour now forced only if icon has a border.
+ * Fixed bug in 3d icons, wrong colours in 8bpp modes.
+ * Added r3-> list of messages expected if task knows about version 284 or later.
+ * Moved task priority and message list code to be conditional on Version >= 284
+ and not on Swapping.
+ * Shift-Full_Size toggle to max size that doesn't hide icon bar.
+
+
+---------------------------------------------------------------------------
+
+Version: 2.85 Mon 12-Nov-90 Ran Mokady
+
+* Added border (B) and pointer (P) commands to validation string of
+ indirected icons.
+
+---------------------------------------------------------------------------
+
+Version: 2.87 Tue 12-Mar-91 Ran Mokady
+
+ 02-Jan-91 2.86 Read timeouts and distances from CMOS RAM.
+ Added auto submenu opening.
+
+
+ 05-Mar-91 2.87 Fixed bug in messages lists (blocked all messages if
+ message list was present!).
+
+ Uses OS_ReadSysInfo to read configured mode/Wimpmode.
+ (Now in same byte).
+
+
+---------------------------------------------------------------------------
+
+Version: 2.89 Tue 16-Apr-91 Ran Mokady
+
+ 2.88 Fixed bug: Now Uses OS_ReadSysInfo to read configured
+ mode in both places where it is read.
+
+ 2.89 Added sysflags_nobounds to enable all windows be opened off screen
+ in all directions.
+ * Fixed bug in NewLook stuff that changed graphics clip window
+ while dragging without instant effects enabled.
+ * Added UserBars flag to enable the use of sprites for all the window
+ tools including the scroll bars.
+ * Removed *Configure wimpmode.
+ * Changed template loading to use OS_File, and fall back
+ to OS_GBPB if the OS_File fails.
+ * Moved toggle icon bar to Shift+F12
+
+
+---------------------------------------------------------------------------
+
+Version: 2.90 Fri 03-May-91 Ran Mokady
+
+ 24-Apr-91 2.90 Cache UserBars sprites on init and mode changes.
+ * Divided UserBars title sprite into two.
+ * Read configured mode when first task starts.
+ * Fixed a number of positioning bugs in UserBars stuff
+ * Added slowdown code for portable.
+ * Allow use of 2.00 code if sprites not present for
+ title and scroll bars.
+ * Allow aliasing of pressed sprites to no-pressed sprires if
+ pressed sprite not present.
+
+
+
+
+---------------------------------------------------------------------------
+
+Version: 2.92 Tue 28-May-91 Ran Mokady
+
+ 06-May-91 2.91 Changed delay configuration units to 1/10 sec.
+ * Added WimpMenuDragDelay
+ * Fixed bug: horizontal scroll bar vanished in 8bpp modes when
+ y0 was 0 (R7 was set to 0 on entry to getspriteinfo).
+ 28-May-91 2.92 Added K command in validation string
+ * Wimp now looks sprites up in Wimp pool if not found in window's
+ *
+
+
+
+---------------------------------------------------------------------------
+
+Version: 2.93 Sat 01-Jun-91 Ran Mokady
+
+ * Bug fixes
+
+---------------------------------------------------------------------------
+
+Version: 2.94 Thu 13-Jun-91 Ran Mokady
+
+ * Bug fixes
+
+
+---------------------------------------------------------------------------
+
+Version: 2.95 Mon 22-Jul-91 Ran Mokady
+
+ * Fixed bug, Wimp_ReportError stiffed machine if R1=0 on entry and in text mode.
+ * Fixed bug, !Madness made icon bar move.
+ * Added SWI Wimp_AddMessages
+ * Wimp_Initialise now only reports an error if passed in version is <200 or > 300
+ if 200 < version < 300 then 200 is used as the version number.
+ * Error boxes now only respond to <CR> and <Esc>.
+
+---------------------------------------------------------------------------
+
+Version: 2.96 Wed 07-Aug-91 Ran Mokady
+
+ * Bug fixes
+ * Revert to old RISC OS 2.00 palette.
+
+
+---------------------------------------------------------------------------
+
+Version: 2.97 Wed 28-Aug-91 Ran Mokady
+
+ * Bug fixes
+ * Added redraw filters.
+
+---------------------------------------------------------------------------
+
+Version: 3.00 Tue 17-Sep-91 Ran Mokady
+
+Release version ?
+---------------------------------------------------------------------------
+
+Version: 3.01 Mon 25-Nov-91 Ran Mokady
+
+ * Added Perth power management support.
+ * Bug fixes
+
+
+---------------------------------------------------------------------------
+
+Version: 3.02 Wed 11-Dec-91 David De Vorchik
+
+ 26-Nov-91 Modified to use ColourTrans for colour mapping
+ 29-Nov-91 Fix bug: WimpSlot now accepts 6 parameters ie: "-min <n>k -max <n>k -next <n>k"
+ 30-Nov-91 Uses ColourTrans for setting GCOLs.
+ 30-Nov-91 Wimp_ReadPixTrans now uses dynamic workspace.
+ 30-Nov-91 Check dither CMOS on mode change and set a suitable workspace location.
+ 03-Dec-91 Implement Wimp_SetColourMapping.
+ 05-Dec-91 Optimised for 1:1 mapping on colours - sets needsfactors.
+ 05-Dec-91 Inversion and greying of sprites re-introduced.
+ 05-Dec-91 Bug fix: When looking for a sprite tries the wimp pool if all fails.
+ 05-Dec-91 Bug fix: User gadgets now plot using correct mappings - also optimised for space.
+ 05-Dec-91 Bug fix: Wimp_ReadPalette reads the mapping palette if applied.
+ 05-Dec-91 Bug fix: Remapping colours works correctly.
+ 06-Dec-91 Bug fix: Wimp_ReadPalette now returns the pointer colours if remapping applied.
+ 06-Dec-91 Bug fix: Screen redraw if Log2BPP >=8 and remapping is *not* applied on setting the palette.
+ 06-Dec-91 Consistent and improved greying and inversion of sprites.
+ 09-Dec-91 New caret plotting introduced.
+ 11-Dec-91 3.02 Bug fix: Caret inversion colours corrected.
+ Added new sprites.
+
+---------------------------------------------------------------------------
+
+Version: 3.04 Wed 15-Jan-92 David De Vorchik
+
+ 30-Dec-91 Bug fix: Die entry when reporting Wimp cannot die error message.
+ 10-Jan-92 3.03 In monochrome modes always dither Wimp colours 0-7.
+ 10-Jan-92 Wimp_ReadPalette works properly; R2 =TRUE means return full 24bit values.
+ 10-Jan-92 Wimp_SetPalette works properly; R2 =TRUE means user specifing full 24bit values.
+ 10-Jan-92 Bug fix: recalcpalette no longer forces redraw of the screen unless really needed.
+ 10-Jan-92 Bug fix: Wimp_ReadPalette returns GCOL in bottom eight bits.
+ 14-Jan-92 Experiment with new inversion code and ColourTrans functions.
+ 14-Jan-92 Recoded the despatch of Wimp_ReadSysInfo reason codes.
+ 15-Jan-92 3.04 Bug fix: When setting palette preserve supremacy bits.
+
+---------------------------------------------------------------------------
+
+Version: 3.05 Thu 23-Jan-92 David De Vorchik
+
+ 15-Jan-92 Bug fix: Screen update in 8BPP modes when palette changed.
+ 18-Jan-92 Dot dash line rotation speed now based on timer, rather than internal counter.
+ 23-Jan-92 3.05 Tweeked the rotation speed of the line, tad faster.
+
+---------------------------------------------------------------------------
+
+Version: 3.06 Thu 27-Feb-92 David De Vorchik
+
+ 7-Feb-92 Service_WimpSpritesMoved added - R2,R3 -> ROM, RAM sprite pools.
+ 7-Feb-92 Added sprite name caching routines.
+ 7-Feb-92 Intergrated the use of sprite name cache.
+ 7-Feb-92 Improved sorting performed on the sprite list.
+ 7-Feb-92 Removed lots of conditional assembly from Wimp01.
+ 8-Feb-92 Removed more conditional assembly, sorted out internationalised code and service trapping.
+ 12-Feb-92 Bug fix: Message token lookup for media search boxes.
+ 12-Feb-92 Bug fix: Wimp_ReportError getting the title bar wrong.
+ 12-Feb-92 Now uses OS_FindMemMapEntries rather than its own *SLOW* implementation.
+ 12-Feb-92 Wimp_RemoveMessages added.
+ 12-Feb-92 Improved seaching of messages list - now stored on a per-task basis.
+ 12-Feb-92 Bug fix: duplicate removal on sprite list sort is biased towards RAM pool.
+ 13-Feb-92 More conditional code removed (Wimp06).
+ 13-Feb-92 Icon borders tidyied and added back in.
+ 14-Feb-92 Template loading catches resources: objects.
+ 15-Feb-92 Bug fix: caching sprites gets correct prefix.
+ 16-Feb-92 Indirected menu titles implemented for long application titles.
+ 16-Feb-92 Bug fix: indirected title bars and wimp created sub-menus.
+ 16-Feb-92 Bug fix: Rogers palette problems - not converted properly.
+ 18-Feb-92 Changed the reseting of filters to a default state, and issuing of Service_RegisterFilters
+ 18-Feb-92 Re-ordered filter despatch workspace; now called using LDMIA Rx,{WP,PC} - coded to macro.
+ 18-Feb-92 Wimp_ReadSysInfo (5) get current task + version of task.
+ 19-Feb-92 Bug fix: all filters passed R2 contain task handle.
+ 23-Feb-92 Only plot the icon borders if task specified Wimp version >= 306, solves clash of validation strings.
+ 23-Feb-92 Added *ToolSprites command to allow loading of sprite borders for windows.
+ 24-Feb-92 Caching of the tool sprites information added.
+ 24-Feb-92 Bug fix: border sprites not seen by Wimp_PlotIcon / Wimp_SpriteOp - saves confusion.
+ 25-Feb-92 Finished new tools sprites routines.
+ 25-Feb-92 Changed syntax of ToolSprites to allow no parameters - meaning default set from WindowManger:Tools.
+ 25-Feb-92 Bug fix: excessive recaching of sprite border pointers - only does once on a mode change.
+ 25-Feb-92 Bug fix: does not reprogram the VDU 5 glyphs if the tool sprites are present.
+ 26-Feb-92 Bug fix: slot size genertes the correct error if not enough memory - not gobbldy gook!
+ 26-Feb-92 Bug fix: source clipping works properly on window gadgets.
+ 26-Feb-92 Further optimisation of dofunkytitle, dofunkyhscroll and dofunkyvscroll.
+ 26-Feb-92 Now keeps SpriteOp paramaters cached to save recalculating them.
+ 26-Feb-92 Some more conditional code removed.
+ 26-Feb-92 Bug fix: pre-scroll offset for scroll bars adjusted by borders properly.
+ 26-Feb-92 3.06 If not sprite tools loaded then falls back to VDU 5 style glyphs, including reprogramming welsh doofers.
+
+ **** BASICLY MADE IT GO LOTS FASTER *****
+
+---------------------------------------------------------------------------
+
+Version: 3.07 Thu 27-Feb-92 Ran Mokady
+
+
+Removed check for task version on icon plotting.
+
+---------------------------------------------------------------------------
+
+Version: 3.08 Thu 12-Mar-92 Lawrence Rust
+
+ 11-Mar-92 3.08 Fix help message for WimpMenuDragDelay - fixes G-RO-8313
+ 12-Mar-92 Messages flag is initialised immediately after claiming ws to ensure
+ if errors are looked up during init (eg in ValidateMode) no address
+ exceptions occur (e.g. if invalid configured screen mode).
+ Fixes RP-0725 and RP-1679
+
+---------------------------------------------------------------------------
+
+Version: 3.09 Thu 19-Mar-92 Lawrence Rust
+
+ 19-Mar-92 3.09 LRust - Redraw of pressed gadgets fixed to not leave in pressed state
+ *help text for WimpDragDelay etc. tidied.
+ Iconsprites now no longer merges the window border tools.
+ This speeds up *iconsprites and prevents address exceptions
+ caused by cached toolsprites having moved.
+ Wimp_SetCaretPosition now pages in task losing caret if icon
+ has indirected data.
+
+---------------------------------------------------------------------------
+
+Version: 3.10 Thu 02-Apr-92 Lawrence Rust
+
+ * Fixed caret positioning in writable icons by ensuring that
+ drawicon_system in Wimp04 adjusts for borders before calling
+ findtextorigin - thus text is correctly aligned in bordered icons.
+ * Menu titles can be indirected using bit8 of the first menu item
+ * KA validation string now causes caret to move to the same character
+ position within the new icon when up or down arrow pressed.
+ * Fixed bug RP-2025, adjust drag scroll bars without instant vertical effects
+ erroneously called a user drag routine, and went BANG!!
+ * Fix RP-1809, Wimp_ReportError now forces VDU output back to the
+ screen before drawing the error box, and restores re-direction and
+ other states on exit
+ * Fixed RP-1913, Wimp_Initialise now accepts any control character to
+ terminate the task descriptor string. Subr Count0 fixed to do this.
+ * Fix RP-1537. *WimpPalette now checks that there are exactly 16 palette
+ entries in the file, thus avoiding problems with the 256 colour variety
+ * KA validation string cause up/down arrow to move to end of new field,
+ fixes G-RO-7130, RP-1168
+ * Sprite highlighting changed again! fixes RR-1674 and Rp-1402
+ * Sprite graying changed again! fixes RP-2094
+ * Initptrs now preserves R0, preventing R0 from being corrupted on Service_Reset
+ * Fix RP-2148 and RP-2150 - F command in validation specifying font colours
+ now accepts lowercase hex colour numbers.
+ * Fix RP-2153 - Mode change now uses default colour mappings for the mode to ensure
+ the physical palette isn't changed by use of Wimp_SetColourMapping to alter
+ logical colour mapping. In addition Wimp_SetColourMapping also forces
+ re-caching of tool sprites to ensure the cached palette is correct.
+ * Fix die entry if tasks are active to restore R12 after (and not before!)
+ translating the CantKill error.
+ * Respond to service_InvalidateCache
+ * Add reason code 7 to ReadSysInfo to return Wimp version
+
+---------------------------------------------------------------------------
+
+Version: 3.11 Tue 07-Apr-92 Lawrence Rust
+
+ * 3D scroll bar routines fixed to only plot icons if clipping rectangle is
+ non null. Pressed hscroll bars drawn correctly. Fixes RP-1766 and other
+ 3D tool complaints.
+ * Service_InvalidateCache disposes of tool_list only, redrawing window with
+ empty tool_list calls maketoollist to re-cache tool info.
+
+---------------------------------------------------------------------------
+
+Version: 3.12 Thu 16-Apr-92 Lawrence Rust
+
+* ExitPoll only calls post filter if event in R0 is valid (ie not when
+ R0 is setup for Wimp_StartTask.
+* ExitPoll call to portable module for non null events optimised.
+* Recoded scanpollwords to use a packed list of pollword tasks to improve
+ search time. Fixes G-RO-7574
+* Submenus now displayed immediately to right of arrow (left in hebrew), not
+ to right of window, in case title wider than item.
+* Fixed template loading to correctly preserve file handle if insufficient
+ RMA to cache the file. Fixes RO-8608 (Acorn DTP not starting on 1 Mb machine).
+* Wimp_ReportError correctly returns cancel if escape pressed with highlight on ok
+
+---------------------------------------------------------------------------
+
+Version: 3.13 Thu 23-Apr-92 Ran Mokady
+
+* Remove input focus from iconized windows.
+
+---------------------------------------------------------------------------
+
+Version: 3.14 Fri 24-Apr-92 Ran Mokady
+
+* Fixed redraw bug, caret size now takes into account the icon border.
+
+
+---------------------------------------------------------------------------
+
+Version: 3.15 Fri 24-Apr-92 Ran Mokady
+
+* Stop text in non indirected sprite and text icons from being printed if an
+ error occurs when plotting the sprite. Fixes bug in !PinPoint.
+
+* Pass correct registers to blockcopy filter.
+
+* Call rectangle filter when system area of window is being drawn.
+
+
+
+---------------------------------------------------------------------------
+
+Version: 3.16 Thu 30-Apr-92 Lawrence Rust
+
+* Fixed address exception during mode change with little RMA
+ VDU 5 glyphs correctly used for undefined toolsprites
+
+---------------------------------------------------------------------------
+
+Version: 3.20 Tue 23-Mar-93 Neil Kelleher
+
+* Outline system font implemented: Wimp$font, Wimp$fontsize, Wimp$fontwidth
+ control appearance of font used in menus and icons in general.
+
+* Menu width calculated automatically to maximum width of menu items, except
+ when a writeable field exists when stated width is used as a minimum.
+
+* Improved background filling for inverted and sprite+text icons.
+
+* Support Wimp_ReadSysInfo (Reason 8) returning system font handle in R0 and
+ symbol font handle in R1.
+
+* 'Kar' bug fixed.
+
+* Wimp now sends message when system font changes.
+
+* Added new SWI, Wimp_GetIconInfo.
+
+* Creating icons on icon bar, automatically widen if text (in current system font)
+ doesn't fit- NOTE, if fontwidth changes during desktop use, it is not updated.
+
+* Implemented prototype features for tiling window backdrops and slab in/out
+ of border 1 sprite icons.
+
+
+---------------------------------------------------------------------------
+
+Version: 3.22 Thu 15-Jul-93 Neil Kelleher
+
+* various improvements to outline system font. See spec
+
+* new error system allowing severity and extension through service calls
+
+* Medusa memory management support
+
+* watchdog to kill off rogue tasks
+
+* New SWI's: ResizeIcon, SetWatchdogState and Extend (direct calling mechanism)
+
+* Speedups and bug fixes.
+
+
+---------------------------------------------------------------------------
+
+Version: 3.23 Fri 20-Aug-93 Neil Kelleher
+
+* CMOS configuration for desktop font.
+
+* GetIconInfo SWI now TextOp
+
+* Return and escape can be used on error boxes with custom buttons
+
+* deleted writables with KRANT validation now ignored when using arrow keys
+
+* various bug fixes
+
+---------------------------------------------------------------------------
+
+Version: 3.24 Fri 27-Aug-93 Neil Kelleher
+
+* (O Love) Altered error messages
+
+* Added CMOS control for tiling of window backgrounds.
+
+* various bug fixes
+
+---------------------------------------------------------------------------
+
+Version: 3.25 Fri 03-Sep-93 Neil Kelleher
+
+* Added different tile depth support
+
+* rearranged sources
+
+* auto menu width no takes sprites into account
+
+---------------------------------------------------------------------------
+
+Version: 3.27 Fri 17-Sep-93 Neil Kelleher
+
+* altered window furniture code - should be more efficient
+
+* made DA sprite area on medusa more efficient
+
+* can *WimpMode outside of desktop
+
+* fixed a few bugs incl. grey modes
+
+---------------------------------------------------------------------------
+
+Version: 3.28 Thu 30-Sep-93 Neil Kelleher
+
+* WrCh vector now released on Service_ModeChange - catches 'single tasking'
+ apps that change screen mode with OS_ScreenMode rather than VDU 22.
+
+---------------------------------------------------------------------------
+
+Version: 3.29 Thu 30-Sep-93 Neil Kelleher
+
+* updated to cope with increased sprite op reason code.
+
+---------------------------------------------------------------------------
+
+Version: 3.30 Mon 04-Oct-93 Neil Kelleher
+
+* updated !WIMPSymbol.
+
+---------------------------------------------------------------------------
+
+Version: 3.31 Wed 06-Oct-93 Neil Kelleher
+
+* tweaked darwin.
+
+* reorganised sources - can now build with outlinefont off.
+
+* speeded up mode changes
+
+* fixed some selected icon problems.
+
+---------------------------------------------------------------------------
+
+Version: 3.32 Fri 08-Oct-93 Neil Kelleher
+
+* On Medusa memory is returned when exiting desktop.
+
+* workaround for toolsprites code causing lots of 'can't find sprite'
+---------------------------------------------------------------------------
+
+Version: 3.33 Mon 11-Oct-93 Neil Kelleher
+
+* now uses look up table for program errors
+
+* few memory fixes.
+
+* caret is red on 16/32 bit modes.
+---------------------------------------------------------------------------
+
+Version: 3.34 Tue 19-Oct-93 Neil Kelleher
+
+* yet more memory fixes.
+
+* error block now copied so message trans overwritting buffers is ok.
+
+---------------------------------------------------------------------------
+
+Version: 3.36 Wed 03-Nov-93 Neil Kelleher
+
+* and some more memory fixes!
+
+* fixed line across the screen from an error box bug
+
+* increased minimum scrollbar height and fixed cannot scroll to end bug.
+
+
+---------------------------------------------------------------------------
+
+Version: 3.37 Thu 18-Nov-93 Neil Kelleher
+
+* more memory fixes.
+
+* fixed MED-01061
+
+* fixed MED-00973
+
+* fixed MED-01097
+
+* fixed MED-00297
+
+* fixed MED-01103
+
+---------------------------------------------------------------------------
+
+Version: 3.38 Wed 01-Dec-93 Neil Kelleher
+
+* fixed MED-00967/8
+
+* fixed MED-00974
+
+* altered icon selection (faster, sprites slightly different colours)
+
+* fixed MED-00966
+
+* ALT-BREAK now used for watchdog
+
+* fixed MED-01342
+
+* fixed MED-01346
+
+* fixed MED-01431
+
+
+
+---------------------------------------------------------------------------
+
+Version: 3.39 Thu 09-Dec-93 Neil Kelleher
+
+* fixed MED-01406
+
+* fixed MED-00776
+
+* Fixed MED-01228
+
+* Fixed MED-01588
+
+* Fixed MED-00414
+
+
+---------------------------------------------------------------------------
+
+Version: 3.40 Wed 12-Jan-94 Neil Kelleher
+
+* Stopped acknowledging messages from deleting events : fixes MED-00003 and
+ MED-00985.
+
+* fixed MED-00943, better handling for iconbar icons with variable text
+
+* fixed MED-00946
+
+* recoded tiling.
+
+* fixed MED-01364
+
+* fixed MED-01418
+
+* fixed MED-01711
+
+* fixed MED-01818
+
+* fixed MED-01894
+
+* fixed MED-02090,1,2122,2146,2202
+
+* fixed MED-02095
+
+
+---------------------------------------------------------------------------
+
+Version: 3.41 Thu 20-Jan-94 Neil Kelleher
+
+* fixed MED-00240
+
+* fixed MED-00563
+
+* fixed MED-02050
+
+* fixed MED-01910
+
+* Tweaked memory management and tiling.
+---------------------------------------------------------------------------
+
+Version: 3.42 Fri 21-Jan-94 Neil Kelleher
+
+* Improved font manager death recovery
+
+* fixed (MED-00114) toolsprite probs.
+
+* Wimp_ClaimFreeMemory works on machines with more than 28 meg.
+
+* tweaked error box templates
+---------------------------------------------------------------------------
+
+Version: 3.44 Mon 31-Jan-94 Neil Kelleher
+
+* W_CFM now returns free pool EEK!!!
+
+* fixed MED-01852
+
+* fixed MED-02443
+
+* fixed MED-02497
+
+* fixed MED-01910
+
+---------------------------------------------------------------------------
+
+Version: 3.45 Thu 03-Feb-94 Neil Kelleher
+
+* improved FM death recovery (now loses fonts so that useage should go down to zero)
+
+* custom buttons get correct border if they are a default (ie. no ok or cancel)
+
+* fixed load template giving spurious errors (affected Magpie and Junior Pinpoint)
+
+* fixed MED-02285
+
+* fixed MED-02269
+
+---------------------------------------------------------------------------
+
+Version: 3.46 Tue 08-Feb-94 Neil Kelleher
+
+* fixed MED-01796
+
+* improved Watchdog to cope with special circumstances such as a running
+Print Job or output switched to sprite.
+
+* improved font preservation (when to do it/ when not to)
+
+* fixed menu delay offset bug.
+
+
+
+---------------------------------------------------------------------------
+
+Version: 3.47 Wed 09-Feb-94 Neil Kelleher
+
+* Thought about font preservation and removed it for now.
+
+---------------------------------------------------------------------------
+
+Version: 3.48 Fri 11-Feb-94 Neil Kelleher
+
+* Fixed MED-02301, substantially changed unfilled text only icons
+
+* Fixed MED-02598
+
+* Fixed bug that could cause program errors to go wrong themselves
+
+* fixed tiling bug - only occurred when a window had a custom sprite
+
+* put in (different) font preservation checking
+
+* Added 'vertical justification' bit to TestOp, Wimp_RenderText
+
+---------------------------------------------------------------------------
+
+Version: 3.49 Wed 16-Feb-94 Neil Kelleher
+
+* Fixed W_CFM (asking for lots of memory didn't fail)
+
+* Added extra FM abuse security (eg. MED-00669)
+
+---------------------------------------------------------------------------
+
+Version: 3.50 Thu 17-Feb-94 Neil Kelleher
+
+* changed Sprite Op's 'can't do that in this depth' error to User one.
+
+***************************************************************************
+ MEDUSA - RISC OS 3.50 build
+***************************************************************************
+* *
+* Project: Black *
+* *
+* Module: Wimp *
+* *
+* Created: Tue 21-Jun-94 By: Aideen McConville *
+* *
+* First version: 3.50 *
+* *
+* Copyright: (C) 1994, Acorn Computers Ltd., Cambridge, England. *
+* *
+***************************************************************************
+
+Purpose:
+========
+
+
+
+***************************************************************************
+
+
+Change Log:
+===========
+
+
+---------------------------------------------------------------------------
+
+Version: 3.50 Tue 21-Jun-94 Aideen McConville
+
+Moved to new source tree.
+
+---------------------------------------------------------------------------
+
+Version: 3.51 Thu 21-Apr-94 Richard Manby
+
+* added power saving code for Stork
+
+---------------------------------------------------------------------------
+
+Version: 3.52 Tue 02-Aug-94 Aideen McConville
+
+* Updated hdr.Wimp (from Neil Kelleher)
+ Contains new reason codes.
+
+---------------------------------------------------------------------------
+
+Version: 3.53 Thu 18-Aug-94 Steve Cormie
+
+* Fixed MED-03541: BadParameters token (which did not appear in any Messages
+ file) replaced with BadParm.
+* Fixed MED-03390: button texts Quit, Continue and OK (for error dialogue)
+ were not looked up in Messages file.
+
+---------------------------------------------------------------------------
+
+Version: 3.54 Tue 13-Sep-94 Steve Cormie
+
+* Fixed MED-03700: various messages now looked up.
+
+---------------------------------------------------------------------------
+
+Version: 3.55 Tue 27-Sep-94 Steve Cormie
+
+* Fixed MED-03711 and MED-01949: long error messages were being copied over
+ workspace causing data aborts.
+* Fixed MED-03346: convert ROM patch to source fix, prevent Wimp accessing
+ info on taskhandle 0.
+* Fixed MED-03135: convert WimpUtils module patch into source fix, workspace
+ pointer corrupted before attempting to read from workspace.
+
+---------------------------------------------------------------------------
+
+Version: 3.56 Wed 28-Sep-94 Alan Glover
+
+* Fixed MED-03674: could make windows disappear because they were being
+ opened behind an iconised window. (s.wimp03)
+* Fixed MED-03233: change name of information sprite (should be information
+ was info1) (sprites)
+* Fixed MED-03145: key names were getting right justified if they appeared
+ in writable menu icons. (s.wimp05)
+* Fixed MED-03087: finally, really, at last fix nager:sprites22 - change the
+ buffer in which the command to load wimp sprites from away from the error
+ buffer! (s.wimp01)
+
+---------------------------------------------------------------------------
+
+Version: 3.57 Tue 18-Oct-94 Aideen McConville
+
+* Fixed MED-03691: Wimp 3.57 onwards will expect its Templates to be in
+ 'Templates' (s.Iconbar, s.Wimp08, Makefile)
+
+* Also corrected Makefile which was copying 2D tools to Resources.
+
+---------------------------------------------------------------------------
+
+Version: 3.58 Thu 20-Oct-94 Alan Glover
+
+* Fixed MED-03800: Avoid an interaction whereby the wimp would obtain a
+ translation table from ColourTrans, and then discard
+ it before it got around to using it. (Affected 16/32bpp
+ sprites in filer windows in 256 (and less) colour modes)
+ (s.wimp01, s.wimp04)
+
+---------------------------------------------------------------------------
+
+Version: 3.59 Sat 29-Oct-94 Aideen McConville
+
+* Added sprites from !Draw (DXF) and !Printers to Wimp Sprites.
+ Also updated Sprites22 and Sprites23 with !Printer sprites.
+
+* Moved Sprites, Sprites22, Sprites23, Tools and Tools3d to UK directory.
+ (updated Makefile and s.wimp08 accordingly).
+
+---------------------------------------------------------------------------
+
+Version: 3.60 Mon 31-Oct-94 Steve Cormie
+
+* Added directed comments to Messages file for message tokenisation.
+* Moved command help/syntax from Global.Messages to Messages file.
+
+---------------------------------------------------------------------------
+
+Version: 3.61 Wed 21-Dec-94 Steve Cormie
+
+* Fixed MED-03323: Don't fill 0 sized icons.
+* Fixed MED-03865: Changed "Wimp Sprite Pool" to "Wimp sprite pool".
+
+---------------------------------------------------------------------------
+
+Version: 3.62 Mon 16-Jan-95 Aideen McConville
+
+* Fixed MED-04107: Added JPEG filetype sprite (c85) to Resources.UK.Sprites[22]
+ Also added Resource filetype (fae).
+
+---------------------------------------------------------------------------
+
+Version: 3.63 Wed 18-Jan-95 Steve Cormie
+
+* Implemented correct fix for MED-03674 (also fixes MED-04376 which resulted
+ from the fix in version 3.56).
+
+---------------------------------------------------------------------------
+
+Version: 3.64 Thu 16-Feb-95 Alan Glover
+
+* Looks like 28 Sep '94 was a **bad** day for coding. Fix bug MED-04476,
+ which arose from the previous fix for MED-03145. Symptom was Edit>Create>Text
+ gave a window without input focus. This was because the caret had got stuck
+ in the menu structure!
+
+
+---------------------------------------------------------------------------
+
+Version: 3.65 Fri 24-Feb-95 Steve Cormie
+
+* Fix for MED-04690: Added sprites file_be8, small_be8 and file_ff0 (were in
+ CDFSFiler sprite files).
+
+---------------------------------------------------------------------------
+
+Version: 3.66 Mon 06-Mar-95 Aideen McConville
+
+* Fixed MED-04771: Shared disc sprites included in Wimp.Sprites[22]
+ AUNMsgs also updated (0.03)
+
+***************************************************************************
+ Black - RISC OS 3.60 (4.28) build
+***************************************************************************