[Emacs-diffs] Changes to ftxfont.c [emacs]

[Kenichi Handa]

CVSROOT:        /cvsroot/emacs
Module name:    emacs
Branch:         emacs
Changes by:     Kenichi Handa <handa>   06/06/06 03:47:13

Index: ftxfont.c
===================================================================
RCS file: ftxfont.c
diff -N ftxfont.c
--- /dev/null   1 Jan 1970 00:00:00 -0000
+++ ftxfont.c   6 Jun 2006 03:47:13 -0000       1.1.2.1
@@ -0,0 +1,346 @@
+/* ftxfont.c -- FreeType font driver on X (without using XFT).
+   Copyright (C) 2006 Free Software Foundation, Inc.
+   Copyright (C) 2006
+     National Institute of Advanced Industrial Science and Technology (AIST)
+     Registration Number H13PRO009
+
+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 2, 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.  */
+
+#include <config.h>
+#include <stdio.h>
+#include <X11/Xlib.h>
+
+#include "lisp.h"
+#include "dispextern.h"
+#include "xterm.h"
+#include "frame.h"
+#include "blockinput.h"
+#include "character.h"
+#include "charset.h"
+#include "fontset.h"
+#include "font.h"
+
+/* FTX font driver.  */
+
+static Lisp_Object Qftx;
+
+/* Prototypes for helper function.  */
+static int ftxfont_draw_bitmap P_ ((FRAME_PTR, GC *, struct font *, unsigned,
+                                   int, int, XPoint *, int, int *n));
+static void ftxfont_draw_backgrond P_ ((FRAME_PTR, struct font *, GC,
+                                       int, int, int));
+
+static int
+ftxfont_draw_bitmap (f, gc, font, code, x, y, p, size, n)
+     FRAME_PTR f;
+     GC *gc;
+     struct font *font;
+     unsigned code;
+     int x, y;
+     XPoint *p;
+     int size, *n;
+{
+  struct font_bitmap bitmap;
+  unsigned char *b;
+  int i, j;
+
+  if (ftfont_driver.get_bitmap (font, code, &bitmap, 1) < 0)
+    return 0;
+  for (i = 0, b = bitmap.buffer; i < bitmap.rows;
+       i++, b += bitmap.pitch)
+    {
+      if (size > 0x100)
+       {
+         for (j = 0; j < bitmap.width; j++)
+           if (b[j / 8] & (1 << (7 - (j % 8))))
+             {
+               p[n[0]].x = x + bitmap.left + j;
+               p[n[0]].y = y - bitmap.top + i;
+               if (++n[0] == 0x400)
+                 {
+                   XDrawPoints (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f),
+                                gc[0], p, size, CoordModeOrigin);
+                   n[0] = 0;
+                 }
+             }
+       }
+      else
+       {
+         for (j = 0; j < bitmap.width; j++)
+           {
+             int idx = (b[j] >> 5) - 1;
+
+             if (idx >= 0)
+               {
+                 XPoint *pp = p + size * idx;
+
+                 pp[n[idx]].x = x + bitmap.left + j;
+                 pp[n[idx]].y = y - bitmap.top + i;
+                 if (++(n[idx]) == 0x100)
+                   {
+                     XDrawPoints (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f),
+                                  gc[idx], pp, size, CoordModeOrigin);
+                     n[idx] = 0;
+                   }
+               }
+           }
+       }
+    }
+
+  if (ftfont_driver.free_bitmap)
+    ftfont_driver.free_bitmap (font, &bitmap);
+
+  return bitmap.advance;
+}
+
+static void
+ftxfont_draw_backgrond (f, font, gc, x, y, width)
+     FRAME_PTR f;
+     struct font *font;
+     GC gc;
+     int x, y, width;
+{
+  XGCValues xgcv;
+
+  XGetGCValues (FRAME_X_DISPLAY (f), gc,
+               GCForeground | GCBackground, &xgcv);
+  XSetForeground (FRAME_X_DISPLAY (f), gc, xgcv.background);
+  XFillRectangle (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f), gc,
+                 x, y - font->ascent, width, font->font.height);
+  XSetForeground (FRAME_X_DISPLAY (f), gc, xgcv.foreground);
+}
+
+/* Prototypes for font-driver methods.  */
+static Lisp_Object ftxfont_list P_ ((Lisp_Object, Lisp_Object));
+static struct font *ftxfont_open P_ ((FRAME_PTR, Lisp_Object, int));
+static void ftxfont_close P_ ((FRAME_PTR, struct font *));
+static int ftxfont_prepare_face (FRAME_PTR, struct face *);
+static void ftxfont_done_face (FRAME_PTR, struct face *);
+
+static int ftxfont_draw P_ ((struct glyph_string *, int, int, int, int, int));
+
+struct font_driver ftxfont_driver;
+
+static Lisp_Object
+ftxfont_list (frame, spec)
+     Lisp_Object frame;
+     Lisp_Object spec;
+{
+  Lisp_Object val = ftfont_driver.list (frame, spec);
+  
+  if (! NILP (val))
+    {
+      int i;
+
+      for (i = 0; i < ASIZE (val); i++)
+       ASET (AREF (val, i), FONT_TYPE_INDEX, Qftx);
+    }
+  return val;
+}
+
+static struct font *
+ftxfont_open (f, entity, pixel_size)
+     FRAME_PTR f;
+     Lisp_Object entity;
+     int pixel_size;
+{
+  Display_Info *dpyinfo = FRAME_X_DISPLAY_INFO (f);
+  struct font *font;
+  XFontStruct *xfont = malloc (sizeof (XFontStruct));
+  
+  if (! xfont)
+    return NULL;
+  font = ftfont_driver.open (f, entity, pixel_size);
+  if (! font)
+    {
+      free (xfont);
+      return NULL;
+    }
+
+  xfont->fid = FRAME_FONT (f)->fid;
+  xfont->ascent = font->ascent;
+  xfont->descent = font->descent;
+  xfont->max_bounds.width = font->font.size;
+  xfont->min_bounds.width = font->min_width;
+  font->font.font = xfont;
+  font->driver = &ftxfont_driver;
+
+  dpyinfo->n_fonts++;
+
+  /* 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.  */
+  if (dpyinfo->n_fonts == 1)
+    {
+      dpyinfo->smallest_font_height = font->font.height;
+      dpyinfo->smallest_char_width = font->min_width;
+      fonts_changed_p = 1;
+    }
+  else
+    {
+      if (dpyinfo->smallest_font_height > font->font.height)
+       dpyinfo->smallest_font_height = font->font.height, fonts_changed_p |= 1;
+      if (dpyinfo->smallest_char_width > font->min_width)
+       dpyinfo->smallest_char_width = font->min_width, fonts_changed_p |= 1;
+    }
+
+  return font;
+}
+
+static void
+ftxfont_close (f, font)
+     FRAME_PTR f;
+     struct font *font;
+{
+  ftfont_driver.close (f, font);
+  FRAME_X_DISPLAY_INFO (f)->n_fonts--;
+}
+
+static int
+ftxfont_prepare_face (f, face)
+     FRAME_PTR f;
+     struct face *face;
+{
+  GC gc[6];
+  XColor colors[3];
+  XGCValues xgcv;
+  unsigned long mask = GCForeground | GCBackground | GCGraphicsExposures;
+  int i;
+
+  face->extra = NULL;
+
+  /* Here, we create 6 more GCs to simulate anti-aliasing.  */
+  BLOCK_INPUT;
+  XGetGCValues (FRAME_X_DISPLAY (f), face->gc, mask, &xgcv);
+  colors[0].pixel = face->foreground;
+  colors[1].pixel = face->background;
+  XQueryColors (FRAME_X_DISPLAY (f), FRAME_X_COLORMAP (f), colors, 2);
+  for (i = 1; i < 7; i++)
+    {
+      colors[2].red = (colors[0].red * i + colors[1].red * (7 - i)) / 7;
+      colors[2].green = (colors[0].green * i + colors[1].green * (7 - i)) / 7;
+      colors[2].blue = (colors[0].blue * i + colors[1].blue * (7 - i)) / 7;
+      if (! x_alloc_nearest_color (f, FRAME_X_COLORMAP (f), &colors[2]))
+       break;
+      xgcv.foreground = colors[2].pixel;
+      gc[i - 1] = XCreateGC (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f),
+                            mask, &xgcv);
+    }
+  UNBLOCK_INPUT;
+
+  if (i < 7)
+    return -1;
+  face->extra = malloc (sizeof (GC) * 7);
+  if (! face->extra)
+    return -1;
+  for (i = 0; i < 6; i++)
+    ((GC *) face->extra)[i] = gc[i];
+  ((GC *) face->extra)[i] = face->gc;
+  return 0;
+}
+
+static void
+ftxfont_done_face (f, face)
+     FRAME_PTR f;
+     struct face *face;
+{
+  if (face->extra)
+    {
+      int i;
+
+      BLOCK_INPUT;
+      for (i = 0; i < 7; i++)
+       XFreeGC (FRAME_X_DISPLAY (f), ((GC *) face->extra)[i]);
+      UNBLOCK_INPUT;
+      free (face->extra);
+      face->extra = NULL;
+    }
+}
+
+static int
+ftxfont_draw (s, from, to, x, y, with_background)
+     struct glyph_string *s;
+     int from, to, x, y, with_background;
+{
+  FRAME_PTR f = s->f;
+  struct face *face = s->face;
+  struct font *font = (struct font *) face->font;
+  XPoint p[0x700];
+  int n[7];
+  unsigned *code;
+  int len = to - from;
+  int i;
+
+  n[0] = n[1] = n[2] = n[3] = n[4] = n[5] = n[6] = 0;
+
+  BLOCK_INPUT;
+
+  if (with_background)
+    ftxfont_draw_backgrond (f, font, s->gc, x, y, s->width);
+  code = alloca (sizeof (unsigned) * len);
+  for (i = 0; i < len; i++)
+    code[i] = ((XCHAR2B_BYTE1 (s->char2b + from + i) << 8)
+              | XCHAR2B_BYTE2 (s->char2b + from + i));
+
+  if (! face->extra)
+    {
+      for (i = 0; i < len; i++)
+       x += ftxfont_draw_bitmap (f, &face->gc, font, code[i], x, y,
+                                 p, 0x700, n);
+      if (n[0] > 0)
+       XDrawPoints (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f),
+                    face->gc, p, n[0], CoordModeOrigin);
+    }
+  else
+    {
+      GC *gc = face->extra;
+
+      for (i = 0; i < len; i++)
+       x += ftxfont_draw_bitmap (f, &face->gc, font, code[i], x, y,
+                                 p, 0x100, n);
+      for (i = 0; i < 7; i++)
+       if (n[i] > 0)
+         XDrawPoints (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f),
+                      gc[i], p + 0x100 * i, n[i], CoordModeOrigin);
+    }
+
+  UNBLOCK_INPUT;
+
+  return len;
+}
+
+
+
+void
+syms_of_ftxfont ()
+{
+  DEFSYM (Qftx, "ftx");
+
+  ftxfont_driver = ftfont_driver;
+  ftxfont_driver.type = Qftx;
+  ftxfont_driver.list = ftxfont_list;
+  ftxfont_driver.open = ftxfont_open;
+  ftxfont_driver.close = ftxfont_close;
+  ftxfont_driver.prepare_face = ftxfont_prepare_face;
+  ftxfont_driver.done_face = ftxfont_done_face;
+  ftxfont_driver.draw = ftxfont_draw;
+
+  register_font_driver (&ftxfont_driver, NULL);
+}