updated for version 7.0001v7.0001

1 files changed, 3547 insertions, 0 deletions

diff --git a/src/gui_riscos.c b/src/gui_riscos.c
new file mode 100644
index 0000000000..b823a79f87
--- /dev/null
+++ b/src/gui_riscos.c
@@ -0,0 +1,3547 @@
+/* vi:set ts=8 sts=4 sw=4:
+ *
+ * VIM - Vi IMproved	by Bram Moolenaar
+ *
+ * Do ":help uganda"  in Vim to read copying and usage conditions.
+ * Do ":help credits" in Vim to see a list of people who contributed.
+ * See README.txt for an overview of the Vim source code.
+ */
+
+#include "vim.h"
+#include <string.h>
+
+/*
+ * gui_riscos.c
+ *
+ * Thomas Leonard <tal197@ecs.soton.ac.uk>
+ * Updated by Andy Wingate <andy@sparse.net>
+ */
+
+extern int time_of_last_poll;
+
+int task_handle = 0;		/* Zero means we are not yet a Wimp task */
+int child_handle = 0;		/* Task handle of our child process (zero if none). */
+int *wimp_menu = (int *) -1;	/* Pointer to a Wimp menu structure (or -1) */
+int save_window = -1;		/* Save As window handle */
+
+int *redraw_block = NULL;	/* NULL means not in a redraw loop. */
+int ro_return_early = FALSE;	/* Break out of gui_mch_wait_for_chars() */
+
+int leaf_ref = 0;		/* Wimp message number - send via Wimp$Scrap */
+char_u *leaf_name = NULL;	/* Leaf name from DataSave */
+
+int default_columns = 120;	/* These values are used if the --rows and --columns */
+int default_rows = 32;		/* options aren't used on startup. */
+
+#define DRAG_FALSE	    0
+#define DRAG_SELECTION	    1
+#define DRAG_RESIZE_WINDOW  2
+int ro_dragging = DRAG_FALSE;
+int drag_button;
+int drag_modifiers;
+int drag_x_offset;
+int drag_y_offset;
+
+int nested_wimp = FALSE;	/* Bool - can we use the new wimp? */
+
+int changed_mode = FALSE;
+int x_eigen_factor;
+int y_eigen_factor;
+
+/* If ro_current_font is non-zero then use the outline font with that handle,
+ * otherwise, if zap_redraw is TRUE then use ZapRedraw, otherwise use the
+ * system font.
+ *
+ * If zap_redraw is TRUE then zap_file[] contains valid Zap font file
+ * pointers (or NULLs).
+ */
+int ro_current_font = 0;	/* 0 is system font, or ZapRedraw */
+int font_x_offset   = 0;	/* Where to position each char in its box */
+int font_y_offset   = 0;
+
+int zap_redraw	    = FALSE;
+int double_height   = FALSE;	/* Plot each line twice? */
+
+#define grgb(r,g,b) ((b<<16) + (g<<8) + (r))
+#define UNUSED_COLOUR (gui.back_pixel)
+
+#define RO_LOAD_CLIPBOARD -2	/* Internal handle for DataSave message. */
+
+/* Changes by John Kortink, 22-23 July 1998
+ *
+ * Stuff to make redraw a lot faster. Almost all of it is right here below,
+ * elsewhere changes are marked with 'JK230798'. Apart from a small change in
+ * 'gui.c' all changes are limited to this file, 'gui_riscos.c'. The change in
+ * 'gui.c' is to make Vim stop being 'smart' not redrawing characters that are
+ * 'already there' (i.e. from the previous line, by coincidence). This caused a
+ * lot more calls to the redraw code, which we want to avoid because a few nice
+ * big strings at a time is a lot faster than a truckload of small ones. ('Dear
+ * Bram ...').
+ */
+
+/* The ZapRedraw structure */
+
+static struct
+{
+    int		r_flags;
+    int		r_minx;
+    int		r_miny;
+    int		r_maxx;
+    int		r_maxy;
+    int		r_screen;
+    int		r_bpl;
+    int		r_bpp;
+    int		r_charw;
+    int		r_charh;
+    char	*r_caddr;
+    int		r_cbpl;
+    int		r_cbpc;
+    int		r_linesp;
+    int		r_data;
+    int		r_scrollx;
+    int		r_scrolly;
+    int		*r_palette;
+    int		r_for;
+    int		r_bac;
+    char	*r_workarea;
+    int		r_magx;
+    int		r_magy;
+    int		r_xsize;
+    int		r_ysize;
+    int		r_mode;
+}
+zap_redraw_block;
+
+/* Other globals */
+
+static int	zap_redraw_initialised = FALSE;
+static int	zap_redraw_update_colours;
+static int	zap_redraw_colours[2];
+static int	zap_redraw_palette[16];
+
+/* Holds the current Zap font file(s).
+ * The font is recreated from this block on a mode change.
+ * When using zap, element ZAP_NORMAL is always valid, but
+ * the others can be NULL.
+ */
+
+#define ZAP_NORMAL  0
+#define ZAP_BOLD    1
+#define ZAP_ITALIC  2
+#define ZAP_BITALIC 3
+#define ZAP_STYLES  4
+
+/* Zap font file format data */
+static char	*zap_file[ZAP_STYLES] = {NULL, NULL, NULL, NULL};
+
+/* r_caddr format for current mode */
+static char	*zap_caddr[ZAP_STYLES] = {NULL, NULL, NULL, NULL};
+
+static void ro_remove_menu(int *menu);
+
+/*
+ * Initialise all the ZapRedraw stuff.
+ * Call this when changing font and after each mode change.
+ * zap_redraw_bitmap must contain a valid Zap font file (possibly
+ * created from the system font).
+ *
+ * Return FAIL to revert to system font (if we can't use ZapRedraw).
+ */
+    int
+ro_zap_redraw_initialise()
+{
+    int	    bytes_per_bitmap_char;
+    int	    first, last;
+    int	    i;
+
+    /* Can't have initialisers for struct members :-(, ok, this way then ... */
+    if (!zap_redraw_initialised)
+    {
+	zap_redraw_block.r_workarea = NULL;
+	zap_redraw_initialised = TRUE;
+    }
+
+    /* We redraw in DSA mode */
+    zap_redraw_block.r_flags = 0x0;
+
+    /* Let ZapRedraw get the screen address for us */
+    zap_redraw_block.r_screen = 0;
+
+    /* Read the font width and height from the font file header.
+     * Assume that all styles are the same size.
+     * ZAP_NORMAL is always present.
+     */
+    zap_redraw_block.r_charw = ((int *) zap_file[ZAP_NORMAL])[2];
+    zap_redraw_block.r_charh = ((int *) zap_file[ZAP_NORMAL])[3];
+
+    /* We have no linespacing */
+    zap_redraw_block.r_linesp = 0;
+
+    /* Fix foreground = colour 1 */
+    zap_redraw_block.r_for = 1;
+
+    /* Fix background = colour 0 */
+    zap_redraw_block.r_bac = 0;
+
+    /* Colour mask buffer */
+    zap_redraw_block.r_palette = zap_redraw_palette;
+
+    /* Allocate local workspace (for the few calls following here) */
+    if (zap_redraw_block.r_workarea != NULL)
+	free(zap_redraw_block.r_workarea);
+    zap_redraw_block.r_workarea = (char*) malloc(128);
+    if (!zap_redraw_block.r_workarea)
+	return FAIL;	/* Out of memory */
+
+    /* Fill in VDU variables */
+    if (xswi(ZapRedraw_ReadVduVars, 0, &zap_redraw_block) & v_flag)
+	return FAIL;	    /* Can't find ZapRedraw module - use VDU instead */
+
+    /* Determine cbpl and cbpc */
+    swi(ZapRedraw_CachedCharSize, zap_redraw_block.r_bpp, 0,
+	zap_redraw_block.r_charw, zap_redraw_block.r_charh);
+    zap_redraw_block.r_cbpl = r2;
+    zap_redraw_block.r_cbpc = r3;
+
+    /* Allocate general workspace (for the calls outside) */
+    if (zap_redraw_block.r_workarea != NULL)
+	free(zap_redraw_block.r_workarea);
+    zap_redraw_block.r_workarea = (char*) malloc(128 + zap_redraw_block.r_cbpl);
+    if (!zap_redraw_block.r_workarea)
+	return FAIL;	/* Out of memory */
+
+    /* Now convert the 1 bpp character data ready for the current mode */
+
+    bytes_per_bitmap_char = (zap_redraw_block.r_charw * zap_redraw_block.r_charh + 7) / 8;
+
+    /* Convert the fonts from 1bpp to a format suitable for the
+     * current mode.
+     */
+    for (i = 0; i < ZAP_STYLES; i++)
+    {
+	first = ((int *) zap_file[i])[4];
+	last  = ((int *) zap_file[i])[5];
+
+	if (last > 255)
+	    last = 255;	/* Don't convert cursors (overwrites memory!) */
+
+	/* Allocate the font cache */
+	vim_free(zap_caddr[i]);
+	if (zap_file[i])
+	    zap_caddr[i] = (char*) malloc(zap_redraw_block.r_cbpc * 256);
+	else
+	    zap_caddr[i] = NULL;    /* No file for this style */
+
+	if (zap_caddr[i])
+	{
+	    zap_redraw_block.r_caddr = zap_caddr[i];
+
+	    swi(ZapRedraw_ConvertBitmap, 0, &zap_redraw_block,
+		    first, last,		/* Range of characters to convert */
+		    zap_file[i] + 0x20	/* Addr of first char provided by font */
+		    - first * bytes_per_bitmap_char);
+	}
+    }
+
+    if (!zap_caddr[ZAP_NORMAL])
+    {
+	zap_redraw = FALSE;	/* Out of memory */
+	return FAIL;
+    }
+
+    /* Next time we need them, we have to update the colour masks */
+    zap_redraw_update_colours = TRUE;
+
+    return OK;
+}
+
+/*
+ * Redraw a string at OS coordinates <x,y> (top-left, x inclusive, y exclusive).
+ * Graphics clip window is window[0..3] as in R1+28..40 of Wimp_RedrawWindow.
+ * Returns (possibly modified) flags.
+ */
+    int
+ro_zap_redraw_draw_string(x, y, string, length, flags, clip)
+    int	    x;
+    int	    y;
+    char    *string;
+    int	    length;
+    int	    flags;	/* DRAW_TRANSP, DRAW_BOLD, DRAW_UNDERL, DRAW_ITALIC */
+    int	    *clip;
+{
+    char redraw_data[1024];
+    int clip_minx;
+    int clip_miny;
+    int clip_maxx;
+    int clip_maxy;
+    int os_xshift = zap_redraw_block.r_magx;
+    int os_yshift = zap_redraw_block.r_magy;
+
+    if (flags & DRAW_TRANSP)
+	return flags;	/* We don't do transparent plotting yet. */
+
+    if (flags & DRAW_BOLD)
+    {
+	if (flags & DRAW_ITALIC && zap_caddr[ZAP_BITALIC])
+	    zap_redraw_block.r_caddr = zap_caddr[ZAP_BITALIC];
+	else
+	    zap_redraw_block.r_caddr = zap_caddr[ZAP_BOLD];
+    }
+    else
+    {
+	if (flags & DRAW_ITALIC)
+	    zap_redraw_block.r_caddr = zap_caddr[ZAP_ITALIC];
+	else
+	    zap_redraw_block.r_caddr = zap_caddr[ZAP_NORMAL];
+    }
+    if (!zap_redraw_block.r_caddr)
+    {
+	zap_redraw_block.r_caddr = zap_caddr[ZAP_NORMAL];
+	flags |= DRAW_UNDERL;	    /* Style missing - we can always underline */
+    }
+
+    /* Set the vertical scaling flag */
+    if (double_height)
+	zap_redraw_block.r_flags = 1 << 1;
+    else
+	zap_redraw_block.r_flags = 0;
+
+    /* Update the colour masks (if needed) */
+    if (zap_redraw_update_colours)
+    {
+	swi(ZapRedraw_CreatePalette, 2,
+		&zap_redraw_block,
+		zap_redraw_colours,
+		zap_redraw_block.r_palette, 2);
+	zap_redraw_update_colours = FALSE;
+    }
+
+    /* Target rectangle in ZapRedraw rectangle coordinates (pixels, Y-min/max reversed !!!) */
+    zap_redraw_block.r_minx = x >> os_xshift;					/* inclusive */
+    zap_redraw_block.r_miny = zap_redraw_block.r_ysize - (y >> os_yshift);	/* inclusive */
+    zap_redraw_block.r_maxx = (x + length * gui.char_width) >> os_xshift;	/* exclusive */
+    zap_redraw_block.r_maxy = zap_redraw_block.r_ysize - ((y - gui.char_height) >> os_yshift);
+										/* exclusive */
+
+    /* Clip rectangle in ZapRedraw rectangle coordinates (pixels, Y-min/max reversed !!!) */
+    clip_minx = clip[0] >> os_xshift;					/* inclusive */
+    clip_miny = zap_redraw_block.r_ysize - (clip[3] >> os_yshift);	/* inclusive */
+    clip_maxx = clip[2] >> os_xshift;					/* exclusive */
+    clip_maxy = zap_redraw_block.r_ysize - (clip[1] >> os_yshift);	/* exclusive */
+
+    /* Clip target rectangle against the current graphics window */
+    if (zap_redraw_block.r_minx < clip_minx)
+    {
+	zap_redraw_block.r_scrollx = clip_minx - zap_redraw_block.r_minx;
+	zap_redraw_block.r_minx = clip_minx;
+    }
+    else
+	zap_redraw_block.r_scrollx = 0;
+    if (zap_redraw_block.r_miny < clip_miny)
+    {
+	zap_redraw_block.r_scrolly = clip_miny - zap_redraw_block.r_miny;
+	zap_redraw_block.r_miny = clip_miny;
+    }
+    else
+	zap_redraw_block.r_scrolly = 0;
+    if (zap_redraw_block.r_maxx > clip_maxx)
+	zap_redraw_block.r_maxx = clip_maxx;
+    if (zap_redraw_block.r_maxy > clip_maxy)
+	zap_redraw_block.r_maxy = clip_maxy;
+
+    /* Fill in the character data structure */
+    if (length > (sizeof(redraw_data) - 2 * 4 - 2))
+	length = sizeof(redraw_data) - 2 * 4 - 2;
+    ((int*) redraw_data)[0] = 2 * 4;
+    ((int*) redraw_data)[1] = 0;
+    strncpy(redraw_data + 2 * 4, string, length);
+    redraw_data[2 * 4 + length + 0] = '\0';
+    redraw_data[2 * 4 + length + 1] = '\x2';
+    zap_redraw_block.r_data = (int) redraw_data;
+
+    /* Perform the draw */
+    swi(ZapRedraw_RedrawArea, 0, &zap_redraw_block);
+
+    return flags;
+}
+
+/*
+ * Okay that was it from me, back to Thomas ...
+ */
+
+/*
+ * Parse the GUI related command-line arguments.  Any arguments used are
+ * deleted from argv, and *argc is decremented accordingly.  This is called
+ * when vim is started, whether or not the GUI has been started.
+ */
+    void
+gui_mch_prepare(int *argc, char **argv)
+{
+    int	    arg = 1;
+
+    while (arg < *argc - 1)
+    {
+	if (strcmp(argv[arg], "--rows") == 0 || strcmp(argv[arg], "--columns") == 0)
+	{
+	    int	    value;
+
+	    value = atoi(argv[arg + 1]);
+
+	    if (argv[arg][2] == 'r')
+		default_rows = value;
+	    else
+		default_columns = value;
+
+	    /* Delete argument from argv[]. (hope this is read/write!) */
+
+	    *argc -= 2;
+	    if (*argc > arg)
+	    mch_memmove(&argv[arg], &argv[arg + 2], (*argc - arg)
+		    * sizeof(char *));
+	}
+	else
+	    arg++;
+    }
+}
+
+/* Fatal error on initialisation - report it and die. */
+    void
+ro_die(error)
+    char_u *error;	/* RISC OS error block */
+{
+    swi(Wimp_ReportError, error, 5, "GVim");
+    exit(EXIT_FAILURE);
+}
+
+/* Find the sizes of the window tools:
+ *
+ * Create a test window.
+ * Find inner and outer sizes.
+ * Find the difference.
+ * Delete window.
+ *
+ * While we're here, find the eigen values too.
+ */
+    void
+ro_measure_tools()
+{
+    int block[10];
+    int vdu[] = { 4, 5, -1};
+    int test_window[] =
+	{
+	    -100, -100,		/* Visible area : min X,Y */
+	    -50, -50,		/*		  max X,Y */
+	    0,   0,		/* Scroll offsets */
+	    -1,			/* Window in front */
+	    0xd0800150,		/* Window flags */
+	    0xff070207,		/* Colours */
+	    0x000c0103,		/* More colours */
+	    0, -0x4000,		/* Workarea extent */
+	    0x4000, 0,		/* max X,Y */
+	    0x00000000,		/* No title */
+	    0 << 12,		/* No workarea button type */
+	    1,			/* Wimp sprite area */
+	    0x00010001,		/* Minimum width, height */
+	    0, 0, 0,		/* Title data (none) */
+	    0			/* No icons */
+	};
+    int inner_max_x, inner_min_y;
+
+    swi(Wimp_CreateWindow, 0, test_window);
+
+    block[0] = r0;
+    /* Open the window (and read state).
+     * GetWindowOutline needs it too if the wimp isn't nested.
+     */
+    swi(Wimp_OpenWindow, 0, block);
+    inner_max_x = block[3];
+    inner_min_y = block[2];
+
+    swi(Wimp_GetWindowOutline, 0, block);
+
+    gui.scrollbar_width = block[3] - inner_max_x;
+    gui.scrollbar_height = inner_min_y - block[2];
+
+    swi(Wimp_DeleteWindow, 0, block);
+
+    /* Read the size of one pixel. */
+    swi(OS_ReadVduVariables, vdu, vdu);
+    x_eigen_factor = vdu[0];
+    y_eigen_factor = vdu[1];
+}
+
+/* Load a template from the current templates file.
+ * Create the window and return its handle.
+ */
+    int
+ro_load_template(str_name, title, title_size)
+    char_u  *str_name;      /* Identifier of window in file (max 12 chars)   */
+    char_u  **title;	    /* If not NULL then return pointer to title here */
+    int     *title_size;    /* If not NULL then return the title length here */
+{
+    int     *window;
+    char    *data;
+    int     name[4];
+
+    strcpy( (char *) name, str_name);
+
+    /* Find how big we must make the buffers */
+
+    if (xswi(Wimp_LoadTemplate, 0, 0, 0, 0, -1, name, 0) & v_flag)
+	ro_die( (char *) r0);
+
+    window = malloc(r1);	/* Don't print text messages from alloc() */
+    data = malloc(r2);
+    if (window == NULL || data == NULL)
+	ro_die("\0\0\0\0Out of memory - Can't load templates");
+
+    /* Load the template into the buffers */
+
+    swi(Wimp_LoadTemplate, 0,
+				window,		/* Temp block */
+				data,		/* Icon data */
+				data + r2 + 1,	/* End of icon data */
+				-1,		/* No fonts */
+				name, 0);	/* First match */
+    if (r6 == 0)
+	ro_die("\0\0\0\0Can't find window in Templates file");
+
+    /* Create the window */
+
+    if (xswi(Wimp_CreateWindow, 0, window) & v_flag)
+	ro_die( (char *) r0);
+
+    if (title)
+	*title = (char_u *) window[18];
+    if (title_size)
+	*title_size = window[20];
+
+    free(window);	/* Free temp block */
+    return r0;		/* Return the window handle */
+}
+
+/*
+ * Check if the GUI can be started.  Called before gvimrc is sourced.
+ * Return OK or FAIL.
+ */
+    int
+gui_mch_init_check()
+{
+    return OK;		/* TODO: GUI can always be started? */
+}
+
+/*
+ * Initialise the RISC OS GUI.
+ * Create all the windows.
+ * Returns OK for success, FAIL when the GUI can't be started.
+ */
+    int
+gui_mch_init()
+{
+    int     messages[] = {
+	    1, 2, 3, 4,	/* DataSave, DataSaveAck, DataLoad, DataLoadAck */
+	    8,		/* PreQuit */
+	    0xf,	/* ClaimEntity (for clipboard) */
+	    0x10,	/* DataRequest (for clipboard) */
+	    0x400c1,	/* Mode change */
+	    0x400c3,	/* TaskCloseDown */
+	    0x400c9,	/* MenusDeleted */
+	    0x808c1,	/* TW_Output */
+	    0x808c2,    /* TW_Ego */
+	    0x808c3,	/* TW_Morio */
+	    0x808c4,	/* TW_Morite */
+	    0};		/* End-of-list. */
+
+
+    /* There may have been some errors reported in the
+     * command window before we get here. Wait if so.
+     */
+    swi(Wimp_ReadSysInfo, 3);
+    if (r0 == 0)
+	swi(Wimp_CommandWindow, 0);	/* Window opened - close with prompt */
+
+    if (xswi(Wimp_Initialise, 310, 0x4b534154, "GVim", messages) & v_flag)
+	return FAIL;
+    nested_wimp = r0 >= 397;
+    task_handle = r1;
+
+    /* Load the templates. */
+
+    if (xswi(Wimp_OpenTemplate, 0, "Vim:Templates") & v_flag)
+	ro_die( (char *) r0);
+
+    gui.window_handle = ro_load_template("editor",
+	    &gui.window_title,
+	    &gui.window_title_size);
+
+    save_window = ro_load_template("save", NULL, NULL);
+
+    swi(Wimp_CloseTemplate);
+
+    /* Set default foreground and background colours. */
+
+    gui.norm_pixel = gui.def_norm_pixel;
+    gui.back_pixel = gui.def_back_pixel;
+
+    /* Get the colours from the "Normal" and "Menu" group (set in syntax.c or
+     * in a vimrc file) */
+
+    set_normal_colors();
+
+    /*
+     * Check that none of the colors are the same as the background color
+     */
+
+    gui_check_colors();
+
+    /* Get the colours for the highlight groups (gui_check_colors() might have
+     * changed them) */
+
+    highlight_gui_started();		/* re-init colours and fonts */
+
+    /* Set geometry based on values read on initialisation. */
+
+    gui.num_cols = Columns = default_columns;
+    gui.num_rows = Rows    = default_rows;
+
+    /* Get some information about our environment. */
+
+    ro_measure_tools();
+
+    return OK;
+}
+
+/*
+ * Called when the foreground or background colour has been changed.
+ */
+    void
+gui_mch_new_colors()
+{
+}
+
+/*
+ * Open the GUI window which was created by a call to gui_mch_init().
+ */
+    int
+gui_mch_open(void)
+{
+    int block[10];
+
+    block[0] = gui.window_handle;
+    swi(Wimp_GetWindowState, 0, block);
+    block[7] = -1;		    /* Open at the top of the stack */
+    swi(Wimp_OpenWindow, 0, block);
+
+    /* Give the new window the input focus */
+    swi(Wimp_SetCaretPosition, gui.window_handle, -1, 0, 0, -1, -1);
+
+    if (gui_win_x != -1 && gui_win_y != -1)
+	gui_mch_set_winpos(gui_win_x, gui_win_y);
+
+    return OK;
+}
+
+    void
+gui_mch_exit(int rc)
+{
+    int	    block[64];
+
+    /* Close window. Stops us from getting troublesome events
+     * if we take a while to die.
+     */
+    block[0] = gui.window_handle;
+    swi(Wimp_CloseWindow, 0, block);
+
+    if (child_handle)
+    {
+	/* We still have a sub-task running - kill it */
+	block[0] = 20;
+	block[3] = 0;
+	block[4] = 0;	    /* Quit */
+	if ((xswi(Wimp_SendMessage, 17, block, child_handle) & v_flag) == 0)
+	{
+	    /* Idle until child dies. */
+	    while (child_handle)
+	    {
+		process_event(wimp_poll(1, block), block);
+	    }
+	}
+    }
+
+    exit(rc);
+}
+
+/*
+ * Get the position of the top left corner of the window.
+ */
+    int
+gui_mch_get_winpos(int *x, int *y)
+{
+    /* TODO */
+    return FAIL;
+}
+
+/*
+ * Set the position of the top left corner of the window to the given
+ * coordinates.
+ */
+    void
+gui_mch_set_winpos(int x, int y)
+{
+    /* TODO */
+}
+
+    void
+gui_mch_set_shellsize(width, height, min_width, min_height, base_width, base_height)
+    int width;		/* In OS units */
+    int height;
+    int min_width;	/* Smallest permissable window size (ignored) */
+    int min_height;
+    int base_width;	/* Space for scroll bars, etc */
+    int base_height;
+{
+    int s_width, s_height;
+    int block[] = {
+	gui.window_handle,
+	0,
+	-height + 1,
+	width,
+	1};
+
+    gui_mch_get_screen_dimensions(&s_width, &s_height);
+    s_width -= base_width;
+    s_height -= base_height;		    /* Underestimate - ignores titlebar */
+
+    swi(Wimp_GetWindowState, 0, block);
+    block[3]  = block[1] + width;
+    block[2]  = block[4] - height;
+    if (block[3] > s_width)
+    {
+	block[3] = s_width;
+	block[1] = block[3] - width;
+    }
+    if (block[2] < gui.scrollbar_height)
+    {
+	block[2] = gui.scrollbar_height;
+	block[4] = block[2] + height;
+    }
+    swi(Wimp_OpenWindow, 0, block);
+    swi(Wimp_ForceRedraw, gui.window_handle, 0, -height, width, 0);
+}
+
+    void
+gui_mch_get_screen_dimensions(int *screen_w, int *screen_h)
+{
+    int block[] = {4, 5, 11, 12, -1};
+
+    swi(OS_ReadVduVariables, block, block);
+    *screen_w = (block[2] + 1) << block[0];
+    *screen_h = (block[3] + 1) << block[1];
+}
+
+/* Take a font name with options and return a font handle, or
+ * zero for failure.
+ * Replace extension with 'Bold' or 'Italic' depending on modifiers.
+ */
+    int
+ro_get_font(fullname, weight)
+    char_u	*fullname;
+    int		weight;		/* Initial weights:
+				 * BIT	    MEANING
+				 * 0	    bold
+				 * 1	    italic
+				 */
+{
+    char_u	*arg;
+    char_u	font[41];
+    int		width = -1;
+    int		height = -1;
+    int		name_len;
+    int		i;
+    char_u	c;
+
+    for (i = 0; i < 39;)
+    {
+	c = fullname[i];
+	if (c == ':' || c == NUL || c == '.')
+	    break;
+	font[i++] = c;
+    }
+
+    /* find the first modifier, NULL if none */
+    arg = strchr(fullname + i, ':');
+
+    while (arg)
+    {
+	switch (*++arg)
+	{
+	    case 'h':
+		height = strtol(arg + 1, (char **) &arg, 10);
+		break;
+	    case 'w':
+		width = strtol(arg + 1, (char **) &arg, 10);
+		break;
+	    case 'b':
+		weight |= 1;
+		break;
+	    case 'i':
+		weight |= 2;
+		break;
+	    default:
+		return 0;
+	}
+	arg = strchr(arg, ':');
+    }
+
+    if ((weight & 1) && i < 35)
+    {
+	/* Bold goes instead of given suffix */
+	strncpy(font + i, ".Bold", 5);
+	i += 5;
+    }
+    else
+    {
+	/* Copy rest of name unless we are using Bold */
+	while (i < 39)
+	{
+	    c = fullname[i];
+	    if (c == ':' || c == NUL)
+		break;
+	    font[i++] = c;
+	}
+    }
+    if ((weight & 2) && i < 32)
+    {
+	strncpy(font + i, ".Oblique", 8);
+	i += 8;
+    }
+
+    font[i] = 0;
+
+    if (height < 1 && width < 1)
+	height = width = 10;	/* Default to 10pt */
+    else if (height < 1)
+	height = width;
+    else if (width < 1)
+	width = height;
+
+    if (xswi(Font_FindFont, 0, font, width << 4, height << 4, 0, 0) & v_flag)
+	return NOFONT;		/* Can't find font */
+
+    return r0;
+}
+
+/* Load a file into allocated memory and check it is valid.
+ * Return a pointer to the allocated block on success.
+ */
+    char    *
+zap_load_file(name, style)
+    char_u  *name;	    /* Name of directory containing styles */
+    char_u  *style;	    /* Name of style within directory */
+{
+    char_u  fname[256];
+    char_u  *file;
+
+    if (strlen(name) + strlen(style) > 254)
+	return NULL;	    /* Names too long */
+
+    sprintf(fname, "%s.%s", name, style);
+
+    /* Load the named font in 1bpp format. */
+    if (xswi(OS_File, 13, fname, 0, 0, "VimFonts:") & v_flag || r0 != 1)
+	return NULL;	    /* Error reading file info, or not a file */
+
+    /* Allocate enough memory to load the whole file */
+    file = (char *) alloc(r4);
+    if (!file)
+	return NULL;	/* Out of memory */
+
+    if (xswi(OS_File, 12, fname, file, 0, "VimFonts:") & v_flag)
+	return NULL;	/* Unable to load file */
+
+    if (strncmp(file, "ZapFont\015", 8) == 0)
+	return file;	/* Loaded OK! */
+
+    free(file);
+    return NULL;	/* Not a valid font file */
+}
+
+/* Load and convert the named font.
+ * If name is NULL or a null string then convert the system font.
+ * Return OK on success; FAIL and we revert to using the VDU drivers.
+ *
+ * 'name' is the name of a directory.
+ * Tries to load 'name.0', 'name.B', 'name.I' and 'name.IB'.
+ */
+    int
+zap_load_font(name)
+    char_u  *name;
+{
+    int	    i;
+
+    /* Free the existing font files, if any */
+    for (i = 0; i < ZAP_STYLES; i++)
+    {
+	vim_free(zap_file[i]);
+	zap_file[i] = NULL;
+    }
+
+    if (name && *name == '!')
+    {
+	name++;
+	double_height = TRUE;
+    }
+    else
+	double_height = FALSE;
+
+    if (name && *name)
+    {
+	zap_file[ZAP_NORMAL]	= zap_load_file(name, "0");
+	if (!zap_file[ZAP_NORMAL])
+	    return FAIL;	/* Can't load the 'normal' style - error */
+
+	zap_file[ZAP_BOLD]	= zap_load_file(name, "B");
+	zap_file[ZAP_ITALIC]	= zap_load_file(name, "I");
+	zap_file[ZAP_BITALIC]	= zap_load_file(name, "IB");
+    }
+    else
+    {
+	int	*header;
+	char	workarea[16];
+	char	*old_wa;
+
+	/* Allocate memory for system font (8 x 8 x 256 bits, plus header) */
+	header = (int *) alloc(0x20 + 8 * 256);
+	if (header == NULL)
+	    return FAIL;
+	zap_file[ZAP_NORMAL] = (char *) header;
+
+	/* Store details about the system font */
+	header[2] = 8;	    /* Width */
+	header[3] = 8;	    /* Height */
+	header[4] = 0;	    /* First char */
+	header[5] = 255;    /* Last char */
+	header[6] = header[7] = 0;  /* Reserved */
+
+	/* Get system font bitmap */
+	old_wa = zap_redraw_block.r_workarea;
+	zap_redraw_block.r_workarea = workarea;
+	swi(ZapRedraw_ReadSystemChars, zap_file[ZAP_NORMAL] + 0x20, &zap_redraw_block);
+	zap_redraw_block.r_workarea = old_wa;
+    }
+
+    return ro_zap_redraw_initialise();
+}
+
+/*
+ * Initialise vim to use the font with the given name.
+ * Return FAIL if the font could not be loaded, OK otherwise.
+ */
+    int
+gui_mch_init_font(char_u *font_name, int fontset)
+{
+    int	    new_handle	= 0;	    /* Use the system font by default */
+
+    if (font_name[0] == '!')
+    {
+	/* Select a ZapRedraw font */
+	if (zap_load_font(font_name + 1))
+	    zap_redraw = TRUE;
+	else
+	{
+	    EMSG2(_("E610: Can't load Zap font '%s'"), font_name);
+	    font_name = "System";   /* Error - use system font */
+	    zap_redraw = FALSE;
+	}
+    }
+    else
+    {
+	zap_redraw = FALSE;
+
+	if (font_name)
+	{
+	    /* Extract any extra details about the font */
+	    new_handle = ro_get_font(font_name, 0);
+	    if (!new_handle)
+		return FAIL;
+	}
+	else
+	    font_name = "System";
+    }
+
+    /* Free the previous font, if any */
+    gui_mch_free_font(gui.norm_font);
+    gui.norm_font = new_handle;
+    gui.char_ascent = 0;
+
+    if (new_handle)
+    {
+	/* Read details about the chosen font */
+	swi(Font_ReadInfo, new_handle);
+
+	gui.char_width	= r3 - r1;
+	gui.char_height = r4 - r2;
+
+	font_x_offset = -r1;	/* Where to position each char in its box */
+	font_y_offset = -r4;
+
+	/* Try to load other fonts for bold, italic, and bold-italic */
+	gui_mch_free_font(gui.bold_font);
+	gui.bold_font = ro_get_font(font_name, 1);
+	gui_mch_free_font(gui.ital_font);
+	gui.ital_font = ro_get_font(font_name, 2);
+	gui_mch_free_font(gui.boldital_font);
+	gui.boldital_font = ro_get_font(font_name, 3);
+    }
+    else
+    {
+	/* Use the system font or ZapRedraw. */
+	if (zap_redraw)
+	{
+	    gui.char_width	= zap_redraw_block.r_charw << zap_redraw_block.r_magx;
+	    gui.char_height	= zap_redraw_block.r_charh << zap_redraw_block.r_magy;
+	    if (double_height)
+		gui.char_height <<= 1;
+	}
+	else
+	{
+	    gui.char_width	= 16;
+	    gui.char_height	= 32;
+	}
+
+	gui_mch_free_font(gui.bold_font);
+	gui.bold_font = 0;
+	gui_mch_free_font(gui.ital_font);
+	gui.ital_font = 0;
+	gui_mch_free_font(gui.boldital_font);
+	gui.boldital_font = 0;
+    }
+    hl_set_font_name(font_name);
+
+    must_redraw = CLEAR;
+    return OK;
+}
+
+    int
+gui_mch_adjust_charsize()
+{
+    return FAIL;
+}
+
+/*
+ * Get a font structure for highlighting.
+ */
+    GuiFont
+gui_mch_get_font(name, giveErrorIfMissing)
+    char_u	*name;
+    int		giveErrorIfMissing;
+{
+    int		handle;
+
+    if (!name)
+	return NOFONT;		/* System font if no name */
+
+    handle = ro_get_font(name, 0);
+    if (!handle)
+    {
+	if (giveErrorIfMissing)
+	    EMSG2(_("E611: Can't use font %s"), name);
+	return NOFONT;
+    }
+
+    return handle;
+}
+
+/*
+ * Set the current text font.
+ */
+    void
+gui_mch_set_font(GuiFont font)
+{
+    ro_current_font = font;
+
+    if (font)
+    {
+	/* Not the system font or ZapRedraw font - select it */
+	swi(Font_SetFont, font);
+    }
+}
+
+#if 0 /* not used */
+/*
+ * Return TRUE if the two fonts given are equivalent.
+ */
+    int
+gui_mch_same_font(GuiFont f1, GuiFont f2)
+{
+    return f1 == f2;
+}
+#endif
+
+/*
+ * If a font is not going to be used, free its structure.
+ */
+    void
+gui_mch_free_font(GuiFont font)
+{
+    if (font)
+	swi(Font_LoseFont, font);
+}
+
+/*
+ * Return the Pixel value (colour) for the given colour name.
+ * Return INVALCOLOR for error.
+ * NB: I've changed Green for now, since it looked really sick
+ */
+    guicolor_T
+gui_mch_get_color(char_u *name)
+{
+    int		i;
+    struct colour
+    {
+	char_u		*name;
+	guicolor_T	value;
+    } colours[] =
+    {
+	{ "Red",		grgb(255,	0,	0)	},
+	{ "LightRed",		grgb(255,	0,	0)	},
+	{ "DarkRed",		grgb(139,	0,	0)	},
+
+	{ "Green",		grgb(50,	200,	50)	},
+	{ "LightGreen",		grgb(144,	238,	144)	},
+	{ "DarkGreen",		grgb(0,		100,	0)	},
+	{ "SeaGreen",		grgb(46,	139,	87)	},
+
+	{ "Blue",		grgb(0,		0,	255)	},
+	{ "LightBlue",		grgb(173,	216,	230)	},
+	{ "DarkBlue",		grgb(0,		0,	139)	},
+	{ "SlateBlue",		grgb(160,	90,	205)	},
+
+	{ "Cyan",		grgb(0,		255,	255)	},
+	{ "LightCyan",		grgb(224,	255,	255)	},
+	{ "DarkCyan",		grgb(0,		139,	139)	},
+
+	{ "Magenta",		grgb(255,	0,	255)	},
+	{ "LightMagenta",	grgb(255,	224,	255)	},
+	{ "DarkMagenta",	grgb(139,	0,	139)	},
+
+	{ "Yellow",		grgb(255,	255,	0)	},
+	{ "LightYellow",	grgb(255,	255,	224)	},
+	{ "DarkYellow",		grgb(139,	139,	0)	},
+	{ "Brown",		grgb(165,	42,	42)	},
+
+	{ "Gray",		grgb(190,	190,	190)	},
+	{ "Grey",		grgb(190,	190,	190)	},
+	{ "LightGray",		grgb(211,	211,	211)	},
+	{ "LightGrey",		grgb(211,	211,	211)	},
+	{ "DarkGray",		grgb(169,	169,	169)	},
+	{ "DarkGrey",		grgb(169,	169,	169)	},
+
+	{ "Black",		grgb(0,		0,	0)	},
+	{ "White",		grgb(255,	255,	255)	},
+
+	{ "Orange",		grgb(255,	165,	0)	},
+	{ "Purple",		grgb(160,	32,	240)	},
+	{ "Violet",		grgb(238,	130,	238)	},
+	{NULL, 0}
+    };
+
+    if (name[0] == '#')
+    {
+	char	    *end;
+	int	    c;
+
+	c = strtol(name + 1, &end, 16);
+	return (guicolor_T) ((c >> 16) & 0xff) | (c & 0xff00) | ((c & 0xff) << 16);
+    }
+
+    for (i = 0; colours[i].name != NULL; i++)
+    {
+	if (STRICMP(name, colours[i].name) == 0)
+	    return colours[i].value;
+    }
+    if (strnicmp(name, "grey", 4) == 0 || strnicmp(name, "gray", 4) == 0)
+    {
+	int level = (255 * atoi(name + 4)) / 100;
+	return (guicolor_T) grgb(level, level, level);
+    }
+    return INVALCOLOR;
+}
+
+/*
+ * Set the current text colours.
+ * If we are using fonts then set the antialiasing colours too.
+ */
+    void
+gui_mch_set_colors(guicolor_T fg, guicolor_T bg)
+{
+    zap_redraw_colours[0] = bg << 8;	/* JK230798, register new background colour */
+    zap_redraw_colours[1] = fg << 8;	/* JK230798, register new foreground colour */
+    zap_redraw_update_colours = TRUE;	/* JK230798, need update of colour masks */
+
+    swi(ColourTrans_ReturnGCOL, fg << 8);
+    gui.fg_colour = r0;
+    swi(ColourTrans_ReturnGCOL, bg << 8);
+    gui.bg_colour = r0;
+
+    if (ro_current_font)
+	swi(ColourTrans_SetFontColours, 0, bg << 8, fg << 8, 14);
+}
+
+    void
+ro_draw_string(x, y, s, len, flags, clip)
+    int	    x;		/* Top-left coord to plot at (x incl, y excl) */
+    int	    y;		/* (screen coords) */
+    char_u  *s;		/* String to plot */
+    int	    len;	/* Length of string */
+    int	    flags;	/* DRAW_TRANSP, DRAW_BOLD, DRAW_UNDERL */
+    int*    clip;	/* JK230798, added clip window */