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/* This file contains push_state() and pop_state() for XDrawablePlotters
(and XPlotters). They supplement the generic behavior of savestate()
and restorestate(), which create and destroy drawing states on the
stack. push_state() constructs X11 GC's (i.e. graphics contexts) for a
new drawing state. We copy into them, from each of the current GC's,
all attributes we're interested in. pop_state() tears down the GC's. */
#include "sys-defines.h"
#include "extern.h"
void
#ifdef _HAVE_PROTOS
_x_push_state (S___(Plotter *_plotter))
#else
_x_push_state (S___(_plotter))
S___(Plotter *_plotter;)
#endif
{
Drawable drawable;
XGCValues gcv;
/* create the X-specified drawing state elements that are pointers (e.g.,
GC's or lists) */
/* determine which if either drawable we'll construct the GC's for */
if (_plotter->x_drawable1)
drawable = _plotter->x_drawable1;
else if (_plotter->x_drawable2)
drawable = _plotter->x_drawable2;
else
drawable = (Drawable)NULL;
if (drawable != (Drawable)NULL)
/* prepare GC's for new drawing state, by copying attributes we use */
{
unsigned long gcmask_fg, gcmask_fill, gcmask_bg;
gcmask_fg =
/* constant attributes (never altered) */
GCPlaneMask | GCFunction
/* drawing attributes set by _x_set_attributes() */
/* NOTE: we also use GCDashOffset and GCDashList, but Xlib does not
support retrieving the dash list from a GC, so we'll copy the
dashing style in another (painful) way */
| GCLineStyle | GCLineWidth | GCJoinStyle | GCCapStyle
/* other GC elements set by the X Drawable driver */
| GCForeground | GCFont;
gcmask_fill =
/* constant attributes (never altered) */
GCPlaneMask | GCFunction | GCArcMode
/* filling attributes set by _x_set_attributes() */
| GCFillRule
/* other GC elements set by the X Drawable driver */
| GCForeground;
gcmask_bg =
/* constant attributes (never altered) */
GCPlaneMask | GCFunction
/* other GC elements set by the X Drawable driver */
| GCForeground;
/* copy from previous drawing state */
/* copy GC used for drawing */
XGetGCValues (_plotter->x_dpy, _plotter->drawstate->previous->x_gc_fg,
gcmask_fg, &gcv);
_plotter->drawstate->x_gc_fg = XCreateGC (_plotter->x_dpy, drawable,
gcmask_fg, &gcv);
if (gcv.line_style != LineSolid)
/* copy dash style info from previous state */
{
int i, dash_list_len;
char *dash_list;
/* add dash style elements to GC used for drawing */
XSetDashes (_plotter->x_dpy, _plotter->drawstate->x_gc_fg,
_plotter->drawstate->previous->x_gc_dash_offset,
_plotter->drawstate->previous->x_gc_dash_list,
_plotter->drawstate->previous->x_gc_dash_list_len);
/* add non-opaque dash style elements */
dash_list_len =
_plotter->drawstate->previous->x_gc_dash_list_len;
dash_list = (char *)_plot_xmalloc (dash_list_len * sizeof(char));
for (i = 0; i < dash_list_len; i++)
dash_list[i] =
_plotter->drawstate->previous->x_gc_dash_list[i];
_plotter->drawstate->x_gc_dash_list = dash_list;
/* these two were already added by the copy operation that took
place in _g_savestate(), but we'll add them again */
_plotter->drawstate->x_gc_dash_list_len = dash_list_len;
_plotter->drawstate->x_gc_dash_offset =
_plotter->drawstate->previous->x_gc_dash_offset;
}
else
{
_plotter->drawstate->x_gc_dash_list = (char *)NULL;
_plotter->drawstate->x_gc_dash_list_len = 0;
_plotter->drawstate->x_gc_dash_offset = 0;
}
/* copy GC used for filling */
XGetGCValues (_plotter->x_dpy, _plotter->drawstate->previous->x_gc_fill,
gcmask_fill, &gcv);
_plotter->drawstate->x_gc_fill = XCreateGC (_plotter->x_dpy, drawable,
gcmask_fill, &gcv);
/* copy GC used for erasing */
XGetGCValues (_plotter->x_dpy, _plotter->drawstate->previous->x_gc_bg,
gcmask_bg, &gcv);
_plotter->drawstate->x_gc_bg = XCreateGC (_plotter->x_dpy, drawable,
gcmask_bg, &gcv);
}
}
void
#ifdef _HAVE_PROTOS
_x_pop_state (S___(Plotter *_plotter))
#else
_x_pop_state (S___(_plotter))
S___(Plotter *_plotter;)
#endif
{
/* N.B. we do _not_ free _plotter->drawstate->x_font_struct anywhere,
when restorestate() is invoked on an X Drawable or X Plotter */
/* Free graphics contexts, if we have them -- and to have them, must have
at least one drawable (see _x_push_state()). */
if (_plotter->x_drawable1 || _plotter->x_drawable2)
{
/* free the dash list in the X11-specific part of the drawing state */
if (_plotter->drawstate->x_gc_dash_list_len > 0
&& _plotter->drawstate->x_gc_dash_list != (char *)NULL)
free ((char *)_plotter->drawstate->x_gc_dash_list);
XFreeGC (_plotter->x_dpy, _plotter->drawstate->x_gc_fg);
XFreeGC (_plotter->x_dpy, _plotter->drawstate->x_gc_fill);
XFreeGC (_plotter->x_dpy, _plotter->drawstate->x_gc_bg);
}
}
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