(struct xftface_info): Delete the member xft_draw.

[bpt/emacs.git] / src / w32bdf.c

/* Implementation of BDF font handling on the Microsoft W32 API.
   Copyright (C) 1999, 2001, 2002, 2003, 2004, 2005,
                 2006, 2007  Free Software Foundation, Inc.

This file is part of GNU Emacs.

GNU Emacs is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.

GNU Emacs is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU Emacs; see the file COPYING.  If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.  */

/* Based heavily on code by H. Miyashita for Meadow (a descendant of
   MULE for W32). */

#include <windows.h>

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include "lisp.h"
#include "character.h"
#include "keyboard.h"
#include "frame.h"
#include "dispextern.h"
#include "fontset.h"
#include "blockinput.h"
#include "w32gui.h"
#include "w32term.h"
#include "w32bdf.h"

/* 10 planes */
#define BDF_CODEPOINT_HEAP_INITIAL_SIZE (96 * 10)
/* about 96 characters */
#define BDF_BITMAP_HEAP_INITIAL_SIZE    (64 * 96)

HANDLE hbdf_cp_heap = INVALID_HANDLE_VALUE;
HANDLE hbdf_bmp_heap = INVALID_HANDLE_VALUE;

void w32_free_bdf_font(bdffont *fontp);
bdffont *w32_init_bdf_font(char *filename);

cache_bitmap cached_bitmap_slots[BDF_FONT_CACHE_SIZE];
cache_bitmap *pcached_bitmap_latest = cached_bitmap_slots;

#define FONT_CACHE_SLOT_OVER_P(p) ((p) >= cached_bitmap_slots + BDF_FONT_CACHE_SIZE)

static int
search_file_line(char *key, char *start, int len, char **val, char **next)
{
  unsigned int linelen;
  unsigned char *p;

  p = memchr(start, '\n', len);
  if (!p) return -1;
  for (;(unsigned char *)start < p;start++)
    {
      if ((*start != ' ') && (*start != '\t')) break;
    }
  linelen = (char *) p - start + 1;
  *next = p + 1;
  if (strncmp(start, key, min(strlen(key), linelen)) == 0)
    {
      *val = start + strlen(key);
      return 1;
    }

  return 0;
}

static int
proceed_file_line(char *key, char *start, int *len, char **val, char **next)
{
  int flag = 0;

  do {
    flag = search_file_line(key, start, *len, val, next);
    *len -= (int)(*next - start);
    start = *next;
  }while(flag == 0);

  if (flag == -1) return 0;
  return 1;
}

static char*
get_quoted_string(char *start, char *end)
{
  char *p, *q, *result;

  p = memchr(start, '\"', end - start);
  if (!p) return NULL;
  p++;
  q = memchr(p, '\"', end - p);
  if (!q) return NULL;

  result = (char*) xmalloc(q - p + 1);

  memcpy(result, p, q - p);
  result[q - p] = '\0';

  return result;
}

static int
set_bdf_font_info(bdffont *fontp)
{
  unsigned char *start, *p, *q;
  int len, flag;
  int bbw, bbh, bbx, bby;
  int val1;

  len = fontp->size;
  start = fontp->font;

  fontp->yoffset = 0;
  fontp->relative_compose = 0;
  fontp->default_ascent = 0;

  fontp->registry = NULL;
  fontp->encoding = NULL;
  fontp->slant = NULL;
/*  fontp->width = NULL; */

  flag = proceed_file_line("FONTBOUNDINGBOX", start, &len,
			   (char **)&p, (char **)&q);
  if (!flag) return 0;
  bbw = strtol(p, (char **)&start, 10);
  p = start;
  bbh = strtol(p, (char **)&start, 10);
  p = start;
  bbx = strtol(p, (char **)&start, 10);
  p = start;
  bby = strtol(p, (char **)&start, 10);

  fontp->llx = bbx;
  fontp->lly = bby;
  fontp->urx = bbw + bbx;
  fontp->ury = bbh + bby;
  fontp->width = bbw;
  fontp->height = bbh;
  start = q;
  flag = proceed_file_line("STARTPROPERTIES", start, &len,
			   (char **)&p, (char **)&q);
  if (!flag) return 1;

  flag = 0;

  do {
    start = q;
    if (search_file_line("PIXEL_SIZE", start, len,
			 (char **)&p, (char **)&q) == 1)
      {
	val1 = atoi(p);
        fontp->pixsz = val1;
      }
    else if (search_file_line("FONT_ASCENT", start, len,
			      (char **)&p, (char **)&q) == 1)
      {
	val1 = atoi(p);
	fontp->ury = val1;
      }
    else if (search_file_line("FONT_DESCENT", start, len,
			      (char **)&p, (char **)&q) == 1)
      {
	val1 = atoi(p);
	fontp->lly = -val1;
      }
    else if (search_file_line("_MULE_BASELINE_OFFSET", start, len,
			      (char **)&p, (char **)&q) == 1)
      {
	val1 = atoi(p);
	fontp->yoffset = -val1;
      }
    else if (search_file_line("_MULE_RELATIVE_COMPOSE", start, len,
			      (char **)&p, (char **)&q) == 1)
      {
	val1 = atoi(p);
	fontp->relative_compose = val1;
      }
    else if (search_file_line("_MULE_DEFAULT_ASCENT", start, len,
			      (char **)&p, (char **)&q) == 1)
      {
	val1 = atoi(p);
	fontp->default_ascent = val1;
      }
    else if (search_file_line("CHARSET_REGISTRY", start, len,
			      (char **)&p, (char **)&q) == 1)
      {
        fontp->registry = get_quoted_string(p, q);
      }
    else if (search_file_line("CHARSET_ENCODING", start, len,
			      (char **)&p, (char **)&q) == 1)
      {
	fontp->encoding = get_quoted_string(p, q);
      }
    else if (search_file_line("SLANT", start, len,
			      (char **)&p, (char **)&q) == 1)
      {
        fontp->slant = get_quoted_string(p, q);
      }
/*
    else if (search_file_line("SETWIDTH_NAME", start, len,
    			      (char **)&p, (char **)&q) == 1)
      {
        fontp->width = get_quoted_string(p, q);
      }
*/
    else
      {
	flag = search_file_line("ENDPROPERTIES", start, len,
				(char **)&p, (char **)&q);
      }
    if (flag == -1) return 0;
    len -= (q - start);
  }while(flag == 0);
  start = q;
  flag = proceed_file_line("CHARS", start, &len, (char **)&p, (char **)&q);
  if (!flag) return 0;
  fontp->nchars = atoi(p);
  fontp->seeked = q;

  return 1;
}

bdffont*
w32_init_bdf_font(char *filename)
{
  HANDLE hfile, hfilemap;
  bdffont *bdffontp;
  unsigned char *font;
  BY_HANDLE_FILE_INFORMATION fileinfo;
  int i;

  if (hbdf_cp_heap == INVALID_HANDLE_VALUE)
    hbdf_cp_heap = HeapCreate(0, BDF_CODEPOINT_HEAP_INITIAL_SIZE, 0);
  if (hbdf_bmp_heap == INVALID_HANDLE_VALUE)
    hbdf_bmp_heap = HeapCreate(0, BDF_BITMAP_HEAP_INITIAL_SIZE, 0);

  if (!hbdf_cp_heap || !hbdf_bmp_heap)
    error("Fail to create heap for BDF");

  hfile = CreateFile(filename, GENERIC_READ, FILE_SHARE_READ, NULL,
		     OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
  if (hfile == INVALID_HANDLE_VALUE) return NULL;
  if (!GetFileInformationByHandle(hfile, &fileinfo) ||
      (fileinfo.nFileSizeHigh != 0) ||
      (fileinfo.nFileSizeLow > BDF_FILE_SIZE_MAX))
    {
      CloseHandle(hfile);
      error("Fail to open BDF file");
    }
  hfilemap = CreateFileMapping(hfile, NULL, PAGE_READONLY, 0, 0, NULL);
  if (hfilemap == INVALID_HANDLE_VALUE)
    {
      CloseHandle(hfile);
      error("Can't map font");
    }

  font = MapViewOfFile(hfilemap, FILE_MAP_READ, 0, 0, 0);

  if (!font)
    {
      CloseHandle(hfile);
      CloseHandle(hfilemap);
      error("Can't view font");
    }

  bdffontp = (bdffont *) xmalloc(sizeof(bdffont));

  for(i = 0;i < BDF_FIRST_OFFSET_TABLE;i++)
    bdffontp->chtbl[i] = NULL;
  bdffontp->size = fileinfo.nFileSizeLow;
  bdffontp->font = font;
  bdffontp->hfile = hfile;
  bdffontp->hfilemap = hfilemap;
  bdffontp->filename = (char*) xmalloc(strlen(filename) + 1);
  strcpy(bdffontp->filename, filename);

  if (!set_bdf_font_info(bdffontp))
    {
      w32_free_bdf_font(bdffontp);
      error("Invalid BDF font!");
    }
  return bdffontp;
}

void
w32_free_bdf_font(bdffont *fontp)
{
  int i, j;
  font_char *pch;
  cache_bitmap *pcb;

  UnmapViewOfFile(fontp->font);
  CloseHandle(fontp->hfilemap);
  CloseHandle(fontp->hfile);

  if (fontp->registry) xfree(fontp->registry);
  if (fontp->encoding) xfree(fontp->encoding);
  if (fontp->slant) xfree(fontp->slant);
/*  if (fontp->width) xfree(fontp->width); */

  xfree(fontp->filename);
  for(i = 0;i < BDF_FIRST_OFFSET_TABLE;i++)
    {
      pch = fontp->chtbl[i];
      if (pch)
	{
	  for (j = 0;j < BDF_SECOND_OFFSET_TABLE;j++)
	    {
	      pcb = pch[j].pcbmp;
 	      if (pcb)
 		{
		  if (pcb->pbmp)
		    HeapFree(hbdf_bmp_heap, 0, pcb->pbmp);
 		  pcb->psrc = NULL;
	    }
	    }
	  HeapFree(hbdf_cp_heap, 0, pch);
        }
    }
  xfree(fontp);
}

static font_char*
get_cached_font_char(bdffont *fontp, int index)
{
  font_char *pch, *result;

  if (!BDF_CODEPOINT_RANGE_COVER_P(index))
    return NULL;

  pch = fontp->chtbl[BDF_FIRST_OFFSET(index)];
  if (!pch)
    return NULL;

  result = &pch[BDF_SECOND_OFFSET(index)];

  if (!result->offset) return NULL;

  return result;
}

static font_char*
cache_char_offset(bdffont *fontp, int index, unsigned char *offset)
{
  font_char *pch, *result;

  if (!BDF_CODEPOINT_RANGE_COVER_P(index))
    return NULL;

  pch = fontp->chtbl[BDF_FIRST_OFFSET(index)];
  if (!pch)
    {
      pch = fontp->chtbl[BDF_FIRST_OFFSET(index)] =
	(font_char*) HeapAlloc(hbdf_cp_heap,
			       HEAP_ZERO_MEMORY,
			       sizeof(font_char) *
                               BDF_SECOND_OFFSET_TABLE);
      if (!pch) return NULL;
      /* memset(pch, 0, sizeof(font_char) * BDF_SECOND_OFFSET_TABLE); */
    }

  result = &pch[BDF_SECOND_OFFSET(index)];
  result->offset = offset;

  return result;
}

static font_char*
seek_char(bdffont *fontp, int index)
{
  font_char *result;
  int len, flag, font_index;
  unsigned char *start, *p, *q;

  if (!fontp->seeked) return NULL;

  start = fontp->seeked;
  len = fontp->size - (start - fontp->font);

  do {
    flag = proceed_file_line("ENCODING", start, &len,
			     (char **)&p, (char **)&q);
    if (!flag)
      {
	fontp->seeked = NULL;
	return NULL;
      }
    font_index = atoi(p);
    result = cache_char_offset(fontp, font_index, q);
    if (!result) return NULL;

    start = result->offset;
  } while (font_index != index);
  fontp->seeked = start;

  return result;
}

static void
clear_cached_bitmap_slots()
{
  int i;
  cache_bitmap *p;

  p = pcached_bitmap_latest;
  for (i = 0;i < BDF_FONT_CLEAR_SIZE;i++)
    {
      if (p->psrc)
	{
	  if (p->pbmp)
	    HeapFree(hbdf_bmp_heap, 0, p->pbmp);
	  p->psrc->pcbmp = NULL;
	  p->psrc = NULL;
	}
      p++;
      if (FONT_CACHE_SLOT_OVER_P(p))
	p = cached_bitmap_slots;
    }
}

#define GET_HEX_VAL(x) ((isdigit(x)) ? ((x) - '0') : \
			(((x) >= 'A') && ((x) <= 'F')) ? ((x) - 'A' + 10) : \
			(((x) >= 'a') && ((x) <= 'f')) ? ((x) - 'a' + 10) : \
			(-1))

int
w32_get_bdf_glyph(bdffont *fontp, int index, int size, glyph_struct *glyph)
{
  font_char *pch;
  unsigned char *start, *p, *q, *bitmapp;
  unsigned char val, val1, val2;
  int i, j, len, flag, consumed;
  int align, rowbytes;

  pch = get_cached_font_char(fontp, index);
  if (!pch)
    {
      pch = seek_char(fontp, index);
      if (!pch)
        return 0;
    }

  start = pch->offset;

  if ((size == 0) && pch->pcbmp)
    {
      glyph->metric = pch->pcbmp->metric;
      return 1;
    }

  len = fontp->size - (start - fontp->font);

  flag = proceed_file_line("DWIDTH", start, &len, (char **)&p, (char **)&q);
  if (!flag)
    return 0;
  glyph->metric.dwidth = atoi(p);

  start = q;
  flag = proceed_file_line("BBX", start, &len, (char **)&p, (char **)&q);
  if (!flag)
    return 0;
  glyph->metric.bbw = strtol(p, (char **)&start, 10);
  p = start;
  glyph->metric.bbh = strtol(p, (char **)&start, 10);
  p = start;
  glyph->metric.bbox = strtol(p, (char **)&start, 10);
  p = start;
  glyph->metric.bboy = strtol(p, (char **)&start, 10);

  if (size == 0) return 1;

  start = q;
  flag = proceed_file_line("BITMAP", start, &len, (char **)&p, (char **)&q);
  if (!flag)
    return 0;

  consumed = 0;
  flag = 0;
  p = q;
  bitmapp = glyph->bitmap;
  rowbytes = (glyph->metric.bbw + 7) / 8;
  /* DIB requires DWORD alignment.  */
  align = sizeof(DWORD) - rowbytes % sizeof(DWORD);
  consumed = glyph->metric.bbh * (rowbytes + align);
  glyph->bitmap_size = consumed;
  glyph->row_byte_size = rowbytes;
  if (size < consumed) return 0;

  for(i = 0;i < glyph->metric.bbh;i++)
    {
      q = memchr(p, '\n', len);
      if (!q) return 0;
      for(j = 0;((q > p) && (j < rowbytes));j++)
	{
	  int ival = GET_HEX_VAL(*p);

	  if (ival == -1) return 0;
	  val1 = ival;
	  p++;
	  ival = GET_HEX_VAL(*p);
	  if (ival == -1) return 0;
	  val2 = ival;
	  p++;
	  val = (unsigned char)((val1 << 4) | val2);
	  if (val) flag = 1;
	  *bitmapp++ = val;
	}
      for(j = 0;j < align;j++)
	*bitmapp++ = 0x00;
      p = q + 1;
    }

  /* If this glyph is white space, return -1. */
  if (flag == 0) return -1;

  return consumed;
}

static
cache_bitmap*
get_bitmap_with_cache(bdffont *fontp, int index)
{
  int bitmap_size, bitmap_real_size;
  font_char *pch;
  cache_bitmap* pcb;
  unsigned char *pbmp;
  glyph_struct glyph;

  pch = get_cached_font_char(fontp, index);
  if (pch)
    {
      pcb = pch->pcbmp;
      if (pcb) return pcb;
    }

  bitmap_size = ((fontp->urx - fontp->llx) / 8 + 3) * (fontp->ury - fontp->lly)
    + 256;
  glyph.bitmap = (unsigned char*) alloca(sizeof(unsigned char) * bitmap_size);

  bitmap_real_size = w32_get_bdf_glyph(fontp, index, bitmap_size, &glyph);

  if (bitmap_real_size == 0)
    return NULL;

  pch = get_cached_font_char(fontp, index);
  if (!pch) return NULL;

  if (bitmap_real_size > 0)
    {
       pbmp = (unsigned char*) HeapAlloc(hbdf_bmp_heap, 0,
					 bitmap_real_size);
       if (!pbmp) return NULL;
       memcpy(pbmp, glyph.bitmap, bitmap_real_size);
    }
  else
    pbmp = NULL; /* white space character */

  pcb = pcached_bitmap_latest;
  if (pcb->psrc)
    clear_cached_bitmap_slots();

  pcb->psrc = pch;
  pcb->metric = glyph.metric;
  pcb->pbmp = pbmp;
  pcb->bitmap_size = glyph.bitmap_size;
  pcb->row_byte_size = glyph.row_byte_size;

  pch->pcbmp = pcb;

  pcached_bitmap_latest++;
  if (FONT_CACHE_SLOT_OVER_P(pcached_bitmap_latest))
    pcached_bitmap_latest = cached_bitmap_slots;

  return pcb;
}

static HBITMAP
create_offscreen_bitmap(HDC hdc, int width, int height, unsigned char **bitsp)
{
  struct {
    BITMAPINFOHEADER h;
    RGBQUAD c[2];
  } info;

  memset(&info, 0, sizeof(info));
  info.h.biSize = sizeof(BITMAPINFOHEADER);
  info.h.biWidth = width;
  info.h.biHeight = -height;
  info.h.biPlanes = 1;
  info.h.biBitCount = 1;
  info.h.biCompression = BI_RGB;
  info.c[1].rgbRed = info.c[1].rgbGreen = info.c[1].rgbBlue = 255;

  return CreateDIBSection(hdc, (LPBITMAPINFO)&info,
			  DIB_RGB_COLORS, (void **)bitsp, NULL, 0);
}

glyph_metric *
w32_BDF_TextMetric(bdffont *fontp, unsigned char *text, int dim)
{
  int index;
  cache_bitmap *pcb;

  if (dim == 1)
    index = *text;
  else
    index = MAKELENDSHORT(text[1], text[0]);

  pcb = get_bitmap_with_cache(fontp, index);
  if (!pcb)
    return NULL;

  return &(pcb->metric);
}

int
w32_BDF_TextOut(bdffont *fontp, HDC hdc, int left,
		 int top, unsigned char *text, int dim, int bytelen,
		 int fixed_pitch_size)
{
  int index, btop;
  unsigned char *textp;
  cache_bitmap *pcb;
  HBRUSH hFgBrush, hOrgBrush;
  HANDLE horgobj;
  UINT textalign;
  int width, height;
  HDC hCompatDC;
  int ret = 1;
  static HBITMAP hBMP = 0;
  static HDC DIBsection_hdc = 0;
  static int DIBsection_width, DIBsection_height;
  static unsigned char *bits;

  hCompatDC = CreateCompatibleDC(hdc);
  if (!hCompatDC)
    return 0;

  textalign = GetTextAlign(hdc);

  hFgBrush = CreateSolidBrush(GetTextColor(hdc));
  hOrgBrush = SelectObject(hdc, hFgBrush);

  textp = text;

  while(bytelen > 0)
    {
      if (dim == 1)
	{
	  index = *textp++;
	  bytelen--;
	}
      else
	{
	  bytelen -= 2;
	  if (bytelen < 0) break;
	  index = MAKELENDSHORT(textp[0], textp[1]);
	  textp += 2;
	}
      pcb = get_bitmap_with_cache(fontp, index);
      if (!pcb)
	{
	  ret = 0;
	  break;
	    }
      if (pcb->pbmp)
	{
	  width = pcb->metric.bbw;
	  height = pcb->metric.bbh;

	  if (!(hBMP
		&& (DIBsection_hdc == hdc)
		&& (DIBsection_width == width)
		&& (DIBsection_height == height)))
	    {
	      if (hBMP) DeleteObject(hBMP);
	      hBMP = create_offscreen_bitmap(hdc, width, height, &bits);
	      DIBsection_hdc = hdc;
	      DIBsection_width = width;
	      DIBsection_height = height;
	      if (!hBMP) return 0;
	}

	  memcpy(bits, pcb->pbmp, pcb->bitmap_size);

      if (textalign & TA_BASELINE)
	  btop = top - (pcb->metric.bbh + pcb->metric.bboy);
      else if (textalign & TA_BOTTOM)
	  btop = top - pcb->metric.bbh;
      else
	  btop = top;

	  horgobj = SelectObject(hCompatDC, hBMP);
	  BitBlt(hdc, left, btop, width, height, hCompatDC, 0, 0, 0xE20746);
	  SelectObject(hCompatDC, horgobj);
	}

      if (fixed_pitch_size)
	left += fixed_pitch_size;
      else
	left += pcb->metric.dwidth;
    }

  DeleteDC(hCompatDC);

  SelectObject(hdc, hOrgBrush);
  DeleteObject(hFgBrush);

  return ret;
}

struct font_info *w32_load_bdf_font (struct frame *f, char *fontname,
                                     int size, char* filename)
{
  struct w32_display_info *dpyinfo = FRAME_W32_DISPLAY_INFO (f);
  struct font_info *fontp;
  XFontStruct *font;
  bdffont* bdf_font;

  bdf_font = w32_init_bdf_font (filename);

  if (!bdf_font) return NULL;

  font = (XFontStruct *) xmalloc (sizeof (XFontStruct));
  bzero (font, sizeof (*font));

  font->bdf = bdf_font;
  font->hfont = 0;

  /* NTEMACS_TODO: Better way of determining if a font is double byte
     or not. */
  font->double_byte_p = bdf_font->nchars > 255 ? 1 : 0;

  w32_cache_char_metrics (font);

  /* Do we need to create the table?  */
  if (dpyinfo->font_table_size == 0)
    {
      dpyinfo->font_table_size = 16;
      dpyinfo->font_table
        = (struct font_info *) xmalloc (dpyinfo->font_table_size
                                        * sizeof (struct font_info));
    }
  /* Do we need to grow the table?  */
  else if (dpyinfo->n_fonts
           >= dpyinfo->font_table_size)
    {
      dpyinfo->font_table_size *= 2;
      dpyinfo->font_table
        = (struct font_info *) xrealloc (dpyinfo->font_table,
                                         (dpyinfo->font_table_size
                                          * sizeof (struct font_info)));
    }

  fontp = dpyinfo->font_table + dpyinfo->n_fonts;

  /* Now fill in the slots of *FONTP.  */
  BLOCK_INPUT;
  bzero (fontp, sizeof (*fontp));
  fontp->font = font;
  fontp->font_idx = dpyinfo->n_fonts;
  fontp->name = (char *) xmalloc (strlen (fontname) + 1);
  bcopy (fontname, fontp->name, strlen (fontname) + 1);
  fontp->full_name = fontp->name;
  /* FIXME: look at BDF spec to see if there are better ways of finding
     average_width and space_width, hopefully that don't involve working out
     the values for ourselves from the data.  */
  fontp->size = fontp->average_width = fontp->space_width = FONT_WIDTH (font);
  fontp->height = FONT_HEIGHT (font);

    /* The slot `encoding' specifies how to map a character
       code-points (0x20..0x7F or 0x2020..0x7F7F) of each charset to
       the font code-points (0:0x20..0x7F, 1:0xA0..0xFF, 0:0x2020..0x7F7F,
       the font code-points (0:0x20..0x7F, 1:0xA0..0xFF,
       0:0x2020..0x7F7F, 1:0xA0A0..0xFFFF, 3:0x20A0..0x7FFF, or
       2:0xA020..0xFF7F).  For the moment, we don't know which charset
       uses this font.  So, we set informatoin in fontp->encoding[1]
       which is never used by any charset.  If mapping can't be
       decided, set FONT_ENCODING_NOT_DECIDED.  */
    fontp->encoding_type = FONT_ENCODING_NOT_DECIDED;
    fontp->baseline_offset = bdf_font->yoffset;
    fontp->relative_compose = bdf_font->relative_compose;
    fontp->default_ascent = bdf_font->default_ascent;

    /* Set global flag fonts_changed_p to non-zero if the font loaded
       has a character with a smaller width than any other character
       before, or if the font loaded has a smaller height than any
       other font loaded before.  If this happens, it will make a
       glyph matrix reallocation necessary.  */
    fonts_changed_p |= x_compute_min_glyph_bounds (f);

    UNBLOCK_INPUT;
    dpyinfo->n_fonts++;
    return fontp;
}

/* Check a file for an XLFD string describing it.  */
int w32_BDF_to_x_font (char *file, char* xstr, int len)
{
  HANDLE hfile, hfilemap;
  BY_HANDLE_FILE_INFORMATION fileinfo;
  char *font, *start, *p, *q;
  int flag, size, retval = 0;

  hfile = CreateFile (file, GENERIC_READ, FILE_SHARE_READ, NULL,
                      OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
  if (hfile == INVALID_HANDLE_VALUE) return 0;
  if (!GetFileInformationByHandle(hfile, &fileinfo) ||
      (fileinfo.nFileSizeHigh != 0) ||
      (fileinfo.nFileSizeLow > BDF_FILE_SIZE_MAX))
    {
      CloseHandle (hfile);
      return 0;
    }
  size = fileinfo.nFileSizeLow;

  hfilemap = CreateFileMapping (hfile, NULL, PAGE_READONLY, 0, 0, NULL);
  if (hfilemap == INVALID_HANDLE_VALUE)
    {
      CloseHandle (hfile);
      return 0;
    }

  font = MapViewOfFile (hfilemap, FILE_MAP_READ, 0, 0, 0);
  if (!font)
    {
      CloseHandle (hfile);
      CloseHandle (hfilemap);
      return 0;
    }
  start = font;

  flag = proceed_file_line ("FONT ", start, &size, &p, &q);
  if (flag)
    {
      /* If font provides a description of itself, check it is a
         full XLFD before accepting it.  */
      int count = 0;
      char *s;

      for (s = p; s < q; s++)
        if (*s == '\n')
          break;
        else if (*s == '-')
          count++;
      if (count == 14 && q - p - 1 <= len)
        {
          strncpy (xstr, p, q-p-1);
          xstr[q-p-1] = '\0';
          /* Files may have DOS line ends (ie still ^M on end).  */
          if (iscntrl(xstr[q-p-2]))
            xstr[q-p-2] = '\0';

          retval = 1;
        }
    }
  UnmapViewOfFile (font);
  CloseHandle (hfile);
  CloseHandle (hfilemap);
  return retval;
}

/* arch-tag: 2e9a45de-0c54-4a0e-95c8-2d67b2b1fa32
   (do not change this comment) */