Initial revision

1 files changed, 547 insertions, 0 deletions

diff --git a/src/xfaces.c b/src/xfaces.c
new file mode 100644
index 00000000000..4c1f0df13ce
--- /dev/null
+++ b/src/xfaces.c
@@ -0,0 +1,547 @@
+/* "Face" primitives
+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 1, 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, 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+#include <sys/types.h>
+#include <sys/stat.h>
+
+#include "config.h"
+#include "lisp.h"
+
+#include "xterm.h"
+#include "buffer.h"
+#include "extents.h"
+#include "screen.h"
+#include "window.h"
+#include "indent.h"
+
+/* Display Context for the icons */ 
+#include <X11/Intrinsic.h>
+#include <X11/StringDefs.h>
+#include <X11/Xmu/Drawing.h>
+#include <X11/Xos.h>
+
+/* A table of display faces.  */
+struct face **face_vector;
+/* The length in use of the table.  */
+int nfaces;
+/* The allocated length of the table.   */
+int nfaces_allocated;
+
+/* The number of face-id's in use (same for all frames).  */
+int next_face_id;
+
+static struct face *allocate_face ();
+static void build_face ();
+
+/* Make a new face that's a copy of an existing one.  */
+
+static struct face *
+copy_face (face)
+     struct face *face;
+{
+  struct face *result = allocate_face ();
+
+  result->font = face->font;
+  result->foreground = face->foreground;
+  result->background = face->background;
+  result->back_pixmap = face->back_pixmap;
+  result->underline = face->underline;
+
+  return result;
+}
+
+static int
+face_eql (face1, face2)
+     struct face *face1, *face2;
+{
+  return (face1->font == face2->font
+          && face1->foreground == face2->foreground
+          && face1->background == face2->background
+          && face1->back_pixmap == face2->back_pixmap
+          && face1->underline == face2->underline);
+}
+
+/* Return the unique display face corresponding to the user-level face FACE.
+
+   If there isn't one, make one, and find a slot in the face_vector to
+   put it in.  */
+
+static struct face *
+get_vector_face (f, face)
+     struct frame *f;
+     struct face *face;
+{
+  int i, empty = -1;
+
+  /* Look for an existing display face that does the job.
+     Also find an empty slot if any.   */
+  for (i = 0; i < nfaces; i++)
+    {
+      if (face_eql (face_vector[i], face))
+        return face_vector[i];
+      if (face_vector[i] == 0)
+        empty = i;
+    }
+
+  /* If no empty slots, make one.  */
+  if (empty < 0 && nfaces == nfaces_allocated)
+    {
+      int newsize = nfaces + 20;
+      face_vector
+        = (struct face **) xrealloc (face_vector,
+                                     newsize * sizeof (struct face *));
+      nfaces_allocated = newsize;
+    }
+
+  if (empty < 0)
+    empty = nfaces++;
+
+  /* Put a new display face in the empty slot.  */
+  result = copy_face (face);
+  face_vector[empty] = result;
+  
+  /* Make a graphics context for it.  */
+  build_face (f, result);
+
+  return result;
+}
+
+/* Clear out face_vector and start anew.
+   This should be done from time to time just to avoid
+   keeping too many graphics contexts in face_vector
+   that are no longer needed.  */
+
+void
+clear_face_vector ()
+{
+  Lisp_Object rest;
+  Display *dpy = x_current_display;
+
+  BLOCK_INPUT;
+  /* Free the display faces in the face_vector.  */
+  for (i = 0; i < nfaces; i++)
+    {
+      struct face *face = face_vector[i];
+      if (face->facegc)
+        XFreeGC (dpy, face->facegc);
+      xfree (face);
+    }
+  nfaces = 0;
+
+  UNBLOCK_INPUT;
+}
+
+/* Make a graphics context for face FACE, which is on frame F.  */
+
+static void
+build_face (f, face)
+     struct frame* f;
+     struct face* face;
+{
+  GC gc;
+  XGCValues xgcv;
+  unsigned long mask;
+
+  xgcv.foreground = face->foreground;
+  xgcv.background = face->background;
+  xgcv.font = face->font->fid;
+  xgcv.graphics_exposures = 0;
+  mask = GCForeground | GCBackground | GCFont | GCGraphicsExposures;
+  gc = XCreateGC (x_current_display, FRAME_X_WINDOW (f),
+                  mask, &xgcv);
+#if 0
+  if (face->back_pixmap && face->back_pixmap != FACE_DEFAULT)
+    XSetStipple (XtDisplay (f->display.x->widget), gc, face->back_pixmap);
+#endif
+  face->facegc = gc;
+}
+
+/* Given a frame face, return an equivalent display face
+   (one which has a graphics context).  */
+
+static struct face *
+get_display_face (f, face)
+     struct frame *f;
+     struct face *face;
+{
+  struct face *result;
+
+  /* Does the face have a GC already?  */
+  if (face->facegc)
+    return face;
+  
+  /* If it's equivalent to the normal face, use that.  */
+  if (face->font == FRAME_NORMAL_FACE (f)->font
+      && face->foreground == FRAME_NORMAL_FACE (f)->foreground
+      && face->background == FRAME_NORMAL_FACE (f)->background
+      && face->back_pixmap == FRAME_NORMAL_FACE (f)->back_pixmap
+      && face->underline == FRAME_NORMAL_FACE (f)->underline)
+    {
+      if (!FRAME_NORMAL_FACE (f)->framegc)
+        build_frame (f, FRAME_NORMAL_FACE (f));
+      return FRAME_NORMAL_FACE (f);
+    }
+
+  /* If it's equivalent to the mode line face, use that.  */
+  if (face->font == FRAME_MODELINE_FACE (f)->font
+      && face->foreground == FRAME_MODELINE_FACE (f)->foreground
+      && face->background == FRAME_MODELINE_FACE (f)->background
+      && face->back_pixmap == FRAME_MODELINE_FACE (f)->back_pixmap
+      && face->underline == FRAME_MODELINE_FACE (f)->underline)
+    {
+      if (!FRAME_MODELINE_FACE (f)->framegc)
+        build_frame (f, FRAME_MODELINE_FACE (f));
+      return FRAME_MODELINE_FACE (f);
+    }
+
+  /* Get a specialized display face.  */
+  return get_cached_face (f, face);
+}
+
+
+/* Allocate a new face */
+static struct face *
+allocate_face ()
+{
+  struct face *result = (struct face *) xmalloc (sizeof (struct face));
+  bzero (result, sizeof (struct face));
+  return result;
+}
+
+/* Make face id ID valid on frame F.  */
+
+void
+ensure_face_ready (f, id)
+     struct frame *f;
+     int id;
+{
+  if (f->n_faces <= id)
+    {
+      int n = id + 10;
+      int i;
+      if (!f->n_faces)
+        f->faces = (struct face **) xmalloc (sizeof (struct face *) * n);
+      else
+        f->faces
+          = (struct face **) xrealloc (f->faces, sizeof (struct face *) * n);
+
+      f->n_faces = n;
+    }
+
+  f->faces[id] = allocate_face ();
+}
+
+/* Allocating, freeing, and duplicating fonts, colors, and pixmaps.  */
+
+#ifdef HAVE_X_WINDOWS
+
+static XFontStruct *
+load_font (f, name)
+     struct frame *f;
+     Lisp_Object name;
+{
+  XFontStruct *font;
+
+  CHECK_STRING (name, 0);
+  BLOCK_INPUT;
+  font = XLoadQueryFont (x_current_display, (char *) XSTRING (name)->data);
+  UNBLOCK_INPUT;
+
+  if (! font)
+    Fsignal (Qerror, Fcons (build_string ("undefined font"),
+                            Fcons (name, Qnil)));
+  return font;
+}
+
+static void
+unload_font (f, font)
+     struct frame *f;
+     XFontStruct *font;
+{
+  if (!font || font == ((XFontStruct *) FACE_DEFAULT))
+    return;
+  XFreeFont (x_current_display, font);
+}
+
+static unsigned long
+load_color (f, name)
+     struct frame *f;
+     Lisp_Object name;
+{
+  Display *dpy = x_current_display;
+  Colormap cmap;
+  XColor color;
+  int result;
+
+  cmap = DefaultColormapOfScreen (x_screen);
+
+  CHECK_STRING (name, 0);
+  BLOCK_INPUT;
+  result = XParseColor (dpy, cmap, (char *) XSTRING (name)->data, &color);
+  UNBLOCK_INPUT;
+  if (! result)
+    Fsignal (Qerror, Fcons (build_string ("undefined color"),
+                            Fcons (name, Qnil)));
+  BLOCK_INPUT;
+  result = XAllocColor (dpy, cmap, &color);
+  UNBLOCK_INPUT;
+  if (! result)
+    Fsignal (Qerror, Fcons (build_string ("X server cannot allocate color"),
+                            Fcons (name, Qnil)));
+  return (unsigned long) color.pixel;
+}
+
+static void
+unload_color (f, pixel)
+     struct frame *f;
+     Pixel pixel;
+{
+  Colormap cmap;
+  Display *dpy = x_current_display;
+  if (pixel == FACE_DEFAULT)
+    return;
+  cmap = DefaultColormapOfScreen (x_screen);
+  BLOCK_INPUT;
+  XFreeColors (dpy, cmap, &pixel, 1, 0);
+  UNBLOCK_INPUT;
+}
+
+#endif /* HAVE_X_WINDOWS */
+
+
+/* frames */
+
+void
+init_frame_faces (f)
+     struct frame f;
+{
+  struct frame *other_frame = 0;
+  Lisp_Object rest;
+
+  for (rest = Vframe_list; !NILP (rest); rest = Fcdr (rest))
+    {
+      struct frame *f2 = XFRAME (Fcar (rest));
+      if (f2 != f && FRAME_IS_X (f2))
+        {
+          other_frame = f2;
+          break;
+        }
+    }
+
+  if (other_frame)
+    {
+      /* Make sure this frame's face vector is as big as the others.  */
+      f->n_faces = other_frame->n_faces;
+      f->faces = (struct face **) xmalloc (f->n_faces * sizeof (struct face *));
+
+      /* Make sure the frame has the two basic faces.  */
+      FRAME_NORMAL_FACE (f)
+        = copy_face (FRAME_NORMAL_FACE (other_frame));
+      FRAME_MODELINE_FACE (f)
+        = copy_face (FRAME_MODELINE_FACE (other_frame));
+    }
+}
+
+
+/* Called from Fdelete_frame?  */
+
+void
+free_screen_faces (f)
+     struct frame *f;
+{
+  Display *dpy = x_current_display;
+  int i;
+
+  for (i = 0; i < f->n_faces; i++)
+    {
+      struct face *face = f->faces [i];
+      if (! face)
+        continue;
+      if (face->facegc)
+        XFreeGC (dpy, face->facegc);
+      unload_font (f, face->font);
+      unload_color (f, face->foreground);
+      unload_color (f, face->background);
+      unload_pixmap (f, face->back_pixmap);
+      xfree (face);
+    }
+  xfree (f->faces);
+  f->faces = 0;
+  f->n_faces = 0;
+}
+
+
+/* Lisp interface */
+
+DEFUN ("frame-face-alist", Fframe_face_alist, Sframe_face_alist, 1, 1, 0,
+       "")
+     (frame)
+     Lisp_Object frame;
+{
+  CHECK_FRAME (frame, 0);
+  return XFRAME (frame)->face_alist;
+}
+
+DEFUN ("set-frame-face-alist", Fset_frame_face_alist, Sset_frame_face_alist,
+       2, 2, 0, "")
+     (frame, value)
+     Lisp_Object frame, value;
+{
+  CHECK_FRAME (frame, 0);
+  XFRAME (frame)->face_alist = value;
+  return value;
+}
+
+
+DEFUN ("make-face-internal", Fmake_face_internal, Smake_face_internal, 1, 1, 0,
+  "Create face number FACE-ID on all frames.")
+  (face_id)
+     Lisp_Object face_id;
+{
+  Lisp_Object rest;
+  int id = XINT (face_id);
+
+  CHECK_FIXNUM (face_id, 0);
+  if (id < 0)
+    error ("Face id must be nonnegative");
+
+  for (rest = Vframe_list; !NILP (rest); rest = XCONS (rest)->cdr)
+    {
+      struct frame *f = XFRAME (XCONS (rest)->car);
+      ensure_face_ready (f, id);
+    }
+  return Qnil;
+}
+
+
+DEFUN ("set-face-attribute-internal", Fset_face_attribute_internal,
+       Sset_face_attribute_internal, 4, 4, 0, "")
+     (face_id, attr_name, attr_value, frame)
+     Lisp_Object face_id, attr_name, attr_value, frame;
+{
+  struct face *face;
+  struct frame *f;
+  int magic_p;
+  int id;
+
+  CHECK_FRAME (frame, 0);
+  CHECK_FIXNUM (face_id, 0);
+  CHECK_SYMBOL (attr_name, 0);
+
+  f = XFRAME (frame);
+  id = XINT (face_id);
+  if (id < 0)
+    Fsignal (Qerror, Fcons (build_string ("invalid face id"),
+                            Fcons (face_id, Fcons (frame, Qnil))));
+
+  ensure_face_ready (f, id);
+  face = f->faces [XFASTINT (face_id)];
+  if (! face) abort ();
+
+  magic_p = (NILP (attr_value) && XFASTINT (face_id) <= 1);
+
+  if (EQ (attr_name, intern ("font")))
+    {
+#ifdef HAVE_X_WINDOWS
+      XFontStruct *font;
+      if (magic_p)
+        error ("font of the `normal' or `modeline' face may not be nil");
+      font = load_font (f, attr_value);
+      unload_font (f, face->font);
+      face->font = font;
+#endif /* HAVE_X_WINDOWS */
+    }
+  else if (EQ (attr_name, intern ("foreground")))
+    {
+#ifdef HAVE_X_WINDOWS
+      unsigned long new_color;
+      if (magic_p)
+        error ("forground color of the `normal' or `modeline' face may not be nil");
+      new_color = load_color (f, attr_value);
+      unload_color (f, face->foreground);
+      face->foreground = new_color;
+#endif /* HAVE_X_WINDOWS */
+    }
+  else if (EQ (attr_name, intern ("background")))
+    {
+#ifdef HAVE_X_WINDOWS
+      unsigned long new_color;
+      if (magic_p)
+        error ("background color of the `normal' or `modeline' face may not be nil");
+      new_color = load_color (f, attr_value);
+      unload_color (f, face->background);
+      face->background = new_color;
+#endif /* HAVE_X_WINDOWS */
+    }
+#if 0
+  else if (EQ (attr_name, intern ("background-pixmap")))
+    {
+#ifdef HAVE_X_WINDOWS
+      unsigned int w, h, d;
+      unsigned long new_pixmap = load_pixmap (f, attr_value, &w, &h, &d, 0);
+      unload_pixmap (f, face->back_pixmap);
+      if (magic_p) new_pixmap = 0;
+      face->back_pixmap = new_pixmap;
+      face->pixmap_w = w;
+      face->pixmap_h = h;
+/*      face->pixmap_depth = d; */
+#endif /* HAVE_X_WINDOWS */
+    }
+#endif /* 0 */
+  else if (EQ (attr_name, intern ("underline")))
+    {
+      int new = !NILP (attr_value);
+      face->underline = new;
+    }
+  else
+    error ("unknown face attribute");
+
+  if (id == 0)
+    {
+      BLOCK_INPUT;
+      XFreeGC (dpy, FRAME_NORMAL_FACE (f)->facegc);
+      build_face (f, FRAME_NORMAL_FACE (f));
+      UNBLOCK_INPUT;
+    }
+
+  if (id == 1)
+    {
+      BLOCK_INPUT;
+      XFreeGC (dpy, FRAME_NORMAL_FACE (f)->facegc);
+      build_face (f, FRAME_NORMAL_FACE (f));
+      UNBLOCK_INPUT;
+    }
+
+  return Qnil;
+}
+
+DEFUN ("internal-next-face-id", Finternal_next_face_id, Sinternal_next_face_id,
+  0, 0, 0, "")
+  ()
+{
+  return make_number (next_face_id++);
+}
+
+void
+syms_of_faces ()
+{
+  defsubr (&Sframe_face_alist);
+  defsubr (&Sset_frame_face_alist);
+  defsubr (&Smake_face_internal);
+  defsubr (&Sset_face_attribute_internal);
+  defsubr (&Sinternal_next_face_id);
+}