
/*
      Defines the internal data structures for the X-windows
   implementation of the graphics functionality in PETSc.
*/

#if !defined(_XIMPL_H)
#define _XIMPL_H
#include <petsc/private/drawimpl.h>

#include <X11/Xlib.h>
#include <X11/Xutil.h>

typedef unsigned long PetscDrawXiPixVal;

typedef struct {
  GC                set;
  PetscDrawXiPixVal cur_pix;
} PetscDrawXiGC;

typedef struct {
  Font              fnt;
  int               font_w,font_h;
  int               font_descent;
  PetscDrawXiPixVal font_pix;
} PetscDrawXiFont;

typedef struct {
  Display           *disp;
  int               screen;
  Window            win;
  Visual            *vis;            /* Graphics visual */
  PetscDrawXiGC     gc;
  PetscDrawXiFont   *font;
  int               depth;           /* Depth of visual */
  int               numcolors;       /* Number of available colors */
  int               maxcolors;       /* Current number in use */
  Colormap          cmap;
  PetscDrawXiPixVal foreground,background;
  PetscDrawXiPixVal cmapping[256];
  int               x,y,w,h;      /* Size and location of window */
  Drawable          drw;
} PetscDraw_X;

#define PetscDrawXiDrawable(w) ((w)->drw ? (w)->drw : (w)->win)

#define PetscDrawXiSetColor(Win,icolor) \
  { if (icolor >= 256 || icolor < 0) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_ARG_OUTOFRANGE,"Color value out of range"); \
    if ((Win)->gc.cur_pix != (Win)->cmapping[icolor]) {                  \
      XSetForeground((Win)->disp,(Win)->gc.set,(Win)->cmapping[icolor]); \
      (Win)->gc.cur_pix = (Win)->cmapping[icolor]; \
    }}

#define PetscDrawXiSetPixVal(Win,pix) \
  { if ((PetscDrawXiPixVal) (Win)->gc.cur_pix != pix) { \
      XSetForeground((Win)->disp,(Win)->gc.set,pix);    \
      (Win)->gc.cur_pix = pix; \
    }}

#endif
