scx/c/xlib/color.c

#include "xlib.h"
#include "scheme48.h"

s48_value Create_Color(s48_value r, s48_value g, s48_value b) {
  s48_value col = S48_MAKE_VALUE(XColor);
  XColor* c = S48_EXTRACT_VALUE_POINTER(col, XColor);
  c->red = s48_extract_integer(r);
  c->green = s48_extract_integer(g);
  c->blue = s48_extract_integer(b);
  
  return col;
}

s48_value Int_Extract_RGB_Values(XColor col) {
  s48_value res = S48_NULL;
  S48_DECLARE_GC_PROTECT(1);
  S48_GC_PROTECT_1(res);
  
  res = s48_cons( s48_enter_integer(col.red), res );
  res = s48_cons( s48_enter_integer(col.green), res );
  res = s48_cons( s48_enter_integer(col.blue), res );
  
  S48_GC_UNPROTECT();
  return res;
}

s48_value Extract_RGB_Values(s48_value Xcolor) {
  XColor* col = EXTRACT_COLOR(Xcolor);
  return Int_Extract_RGB_Values(*col);
}

s48_value Query_Color (s48_value Xcolormap, s48_value Xpixel, 
		       s48_value Xdisplay) {
  XColor c;
  Colormap cm = EXTRACT_COLORMAP(Xcolormap);
  Display* dpy = EXTRACT_DISPLAY(Xdisplay);
  
  c.pixel = EXTRACT_PIXEL(Xpixel);
  XQueryColor(dpy, cm, &c);
  
  return Int_Extract_RGB_Values(c);
}

/*
s48_value Query_Colors(s48_value Xcolormap, s48_value Xpixels,
		       s48_value Xdisplay) {
  Colormap* cm = (Colormap*)S48_EXTRACT_VALUE_POINTER(Xcolormap, Colormap);
  Display* dpy = (Display*)s48_extract_integer(Xdisplay);

  long l = S48_VECTOR_LENGTH(Xpixels);


    register i, n;
    s48_value ret;
    register XColor *p;
    S48_DECLARE_GC_PROTECT(1);
    Alloca_Begin;

    Check_Type (v, T_Vector);
    n = S48_VECTOR_LENGTH(v);
    Alloca (p, XColor*, n * sizeof (XColor));
    for (i = 0; i < n; i++)
	p[i].pixel = Get_Pixel (VECTOR(v)->data[i]);
    Disable_Interrupts;
    XQueryColors (COLORMAP(cmap)->dpy, cm, p, n);
    Enable_Interrupts;
    ret = s48_make_vector (n, S48_NULL);
    S48_GC_PROTECT_1 (ret);
    for (i = 0; i < n; i++, p++) {
	s48_value x;
	
	x = Make_Color (p->red, p->green, p->blue);
	S48_VECTOR_SET(ret, i, x;)
    }
    S48_GC_UNPROTECT;
    Alloca_End;
    return ret;
}

*/

s48_value Lookup_Color(s48_value Xcolormap, s48_value Xdisplay,
		       s48_value color_name) {
  XColor visual, exact;
  Colormap cm = EXTRACT_COLORMAP(Xcolormap);
  Display* dpy = EXTRACT_DISPLAY(Xdisplay);
  
  s48_value res = S48_FALSE;
  S48_DECLARE_GC_PROTECT(1);
  S48_GC_PROTECT_1(res);

  if (XLookupColor( dpy, cm, s48_extract_string(color_name),
		     &visual, &exact )) {
    res = s48_cons( Int_Extract_RGB_Values( visual ),
		    Int_Extract_RGB_Values( exact ) );
  }

  S48_GC_UNPROTECT();
  return res;
}

void s48_init_color(void) {
  S48_EXPORT_FUNCTION(Create_Color);
  S48_EXPORT_FUNCTION(Extract_RGB_Values);
  S48_EXPORT_FUNCTION(Query_Color);
  //  S48_EXPORT_FUNCTION(Query_Colors);
  S48_EXPORT_FUNCTION(Lookup_Color);
}