scx/c/xlib/text.c

#include "xlib.h"
#include "scheme48.h"
#include <stdio.h>

extern XDrawText(), XDrawText16();

/* Calculation of text widths and extents should not be done using
 * the Xlib functions.  For instance, the values returned by
 * XTextExtents() are only shorts and can therefore overflow for
 * long strings.
 */


s48_value scx_Text_Width(s48_value Xfontstruct, s48_value text, 
			 s48_value format){
  int len = (int)S48_VECTOR_LENGTH(text), i, tmp;
  char s[len];
  XChar2b s2[len];
  XFontStruct* font = SCX_EXTRACT_FONTSTRUCT(Xfontstruct);
  if (s48_extract_integer(format) == 1){
    for (i = 0; i < len; i++){
      tmp = (int)s48_extract_integer(S48_VECTOR_REF(text, i));
      s2[i].byte1 = (tmp >> 8) & 0xff;
      s2[i].byte2 = tmp & 0xff;
    }
    i = XTextWidth16(font, s2, len);
  }
  else{
    for (i = 0; i < len; i++){
      s[i] = (int)s48_extract_integer(S48_VECTOR_REF(text, i));
    }
    i = XTextWidth(font, s, len);
  }
  return s48_enter_fixnum((long)i);
}
  

s48_value scx_Extents_Text (s48_value Xfontstruct, s48_value text,
			s48_value format, s48_value which){
  int len = (int)S48_VECTOR_LENGTH(text), i, tmp,  dir, fasc, fdesc;
  char s[len];
  XChar2b s2[len];
  XFontStruct* font = SCX_EXTRACT_FONTSTRUCT(Xfontstruct);
  XCharStruct CI;
  if (s48_extract_integer(format) == 1){
    for (i = 0; i < len; i++){
      tmp = (int)s48_extract_integer(S48_VECTOR_REF(text, i));
      s2[i].byte1 = (tmp >> 8) & 0xff;
      s2[i].byte2 = tmp & 0xff;
    }
    XTextExtents16(font, s2, len, &dir, &fasc, &fdesc, &CI);
  }else{
    for (i = 0; i < len; i++){
      s[i] = (int)s48_extract_integer(S48_VECTOR_REF(text, i));
    }
    XTextExtents(font, s, len, &dir, &fasc, &fdesc, &CI);
  }
  switch(s48_extract_integer(which)){
  case 0:
    return s48_enter_fixnum((long) CI.lbearing);
  case 1:
    return s48_enter_fixnum((long) CI.rbearing);
  case 2:
    return s48_enter_fixnum((long) CI.width);
  case 3:
    return s48_enter_fixnum((long) CI.ascent);
  case 4:
    return s48_enter_fixnum((long) CI.descent);
  }
  return S48_FALSE;
}


s48_value scx_Draw_Image_Text (s48_value Xdisplay, s48_value Xdrawable,
			   s48_value Xgcontext, s48_value x, s48_value y,
			   s48_value text, s48_value is_twobyte){
  int i, len, tmp;
  len = S48_VECTOR_LENGTH(text);

  if (!S48_FALSE_P(is_twobyte)) {
    XChar2b s2[len];
    for (i = 0; i < len; i++) {
      tmp = (int)s48_extract_integer(S48_VECTOR_REF(text, i));
      s2[i].byte1 = (tmp >> 8) & 0xff;
      s2[i].byte2 = tmp & 0xff;
    }
    XDrawImageString16 (SCX_EXTRACT_DISPLAY(Xdisplay), 
			SCX_EXTRACT_DRAWABLE(Xdrawable),
			SCX_EXTRACT_GCONTEXT(Xgcontext), 
			(int)s48_extract_integer(x),
			(int)s48_extract_integer(y), 
			s2, len);
  } else {
    char s[len];
    for (i = 0; i < len; i++) {
      s[i] = (int)s48_extract_integer(S48_VECTOR_REF(text, i));
    }
    XDrawImageString (SCX_EXTRACT_DISPLAY(Xdisplay), 
		      SCX_EXTRACT_DRAWABLE(Xdrawable),
		      SCX_EXTRACT_GCONTEXT(Xgcontext),
		      (int)s48_extract_integer(x),
		      (int)s48_extract_integer(y), 
		      s, len);
  }
  return S48_UNSPECIFIC;
}


// Draw_Poly_Text processes a vector like [[24 23 87 67] Xfont [12 0]] and
// passes it to XDrawPolyText or XDrawPolyText16

s48_value scx_Draw_Poly_Text (s48_value Xdisplay, s48_value Xdrawable, 
			  s48_value Xgcontext, s48_value x, s48_value y,
			  s48_value text, s48_value is_twobyte) {
  int i, len, nitems;
  s48_value temp_vec = S48_FALSE;
  char twobyte = !S48_FALSE_P(is_twobyte);
  len = S48_VECTOR_LENGTH(text);
  
  // Nothing to do with an empty vector.
  if (len == 0)  return S48_UNSPECIFIC;
  
  // count the strings in text:
  nitems = 0;
  for (i = 0; i < len; i++) {
    if (S48_VECTOR_P(S48_VECTOR_REF(text, i)))
      nitems++;
  }

  {
    XTextItem item[nitems];
    int set = 0, j, k, tmp;

    //Maybe no font as first Element of text?
    if (S48_VECTOR_P(S48_VECTOR_REF(text, 0))) {
      item[0].delta = 0;
      item[0].font = None;
    }
    // Generate the XTextItem{16}
    for (i = 0; i < len; i++) {
      if (S48_VECTOR_P(S48_VECTOR_REF(text,i))) {
	temp_vec = S48_VECTOR_REF(text,i);
	k = S48_VECTOR_LENGTH(temp_vec);
	item[set].nchars = k;
	if (twobyte) {
	  XChar2b* s2 = (XChar2b*)malloc(sizeof(XChar2b)*k);
	  for (j = 0; j < k; j++){
	    tmp = (int)s48_extract_integer(S48_VECTOR_REF(temp_vec, j));
	    s2[j].byte1 = (tmp >> 8) & 0xff;
	    s2[j].byte2 = tmp & 0xff;
	  }
	  (XTextItem16*)item[set].chars = s2;
	} else {
	  char* s = (char*)malloc(sizeof(char)*k);
	  for (j = 0; j < k; j++) {
	    s[j] = (int)s48_extract_integer(S48_VECTOR_REF(temp_vec, j));
	  }
	  item[set].chars = s;
	}
	set++;
      } else {
	s48_value fontspec = S48_VECTOR_REF(text, i);
	s48_value font = S48_CAR(fontspec);
	item[set].font = SCX_EXTRACT_FONT(font);
	item[set].delta = s48_extract_integer(S48_CDR(fontspec));
      }
    }
    // No pass it all to the Xlib
    if (twobyte) {
      XDrawText16(SCX_EXTRACT_DISPLAY(Xdisplay), 
		  SCX_EXTRACT_DRAWABLE(Xdrawable),
		  SCX_EXTRACT_GCONTEXT(Xgcontext), 
		  (int)s48_extract_integer(x), (int)s48_extract_integer(y), 
		  (XTextItem16*) item, nitems);
    } else {
      XDrawText(SCX_EXTRACT_DISPLAY(Xdisplay), SCX_EXTRACT_DRAWABLE(Xdrawable),
		SCX_EXTRACT_GCONTEXT(Xgcontext), (int)s48_extract_integer(x),
		(int)s48_extract_integer(y), item, nitems);
    }
    // No free all character-arrays
    for (i = 0; i < nitems; i++)
      free(item[i].chars);
  }
  return S48_UNSPECIFIC;
}
    
	    
	    
void scx_init_text(void) {
  S48_EXPORT_FUNCTION(scx_Text_Width);
  S48_EXPORT_FUNCTION(scx_Extents_Text);
  S48_EXPORT_FUNCTION(scx_Draw_Image_Text);
  S48_EXPORT_FUNCTION(scx_Draw_Poly_Text);
}