-/* Must define frame->faces, frame->n_faces,
- FRAME_NORMAL_FACE, FRAME_MODELINE_FACE. */
-
-/* "Face" primitives
- Copyright (C) 1992, 1993 Free Software Foundation.
-
-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, 675 Mass Ave, Cambridge, MA 02139, USA. */
-
-struct face
-{
- unsigned char underline;
- unsigned char hilited;
- unsigned char modif;
- GC facegc;
- XFontStruct * font;
- unsigned long foreground;
- unsigned long background;
- Pixmap back_pixmap;
- unsigned int pixmap_w, pixmap_h /* , pixmap_depth */;
-};
-
-#include <sys/types.h>
-#include <sys/stat.h>
-
-#include "config.h"
-#include "lisp.h"
-
-#include "xterm.h"
-#include "buffer.h"
-#include "frame.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>
-
-/* We use face structures in two ways:
- At the frame level, each frame has a vector of faces. (f->faces).
- Face number 0 is the normal face (for normal text).
- Face number 1 is the mode line face.
- Higher face numbers have no built-in meaning.
- The faces in these vectors are called "frame faces".
-
- Faces number 0 and 1 have graphics contexts.
- They can be user in the redisplay code directly.
- Higher numbered frame faces do not have graphics contexts.
-
- There are also "cached faces". They have graphics contexts.
- They are kept in a C vector called face_vector.
-
- A "display face" is a face with a graphics context.
- It is either a frame face number 0 or 1,
- or a cached face. */
-
-/* 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;
-
-#define FACE_DEFAULT (~0)
-
-static struct face *allocate_face ();
-static void build_face ();
-\f
-/* 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_cached_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;
-}
-\f
-/* 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;
-}
-\f
-/* Modify face TO by copying from FROM all properties which have
- nondefault settings. */
-
-static void
-merge_faces (from, to)
- struct face *from, *to;
-{
- if (from->font != (XFontStruct *)FACE_DEFAULT)
- {
- to->font = from->font;
- }
- if (from->foreground != FACE_DEFAULT)
- to->foreground = from->foreground;
- if (from->background != FACE_DEFAULT)
- to->background = from->background;
- if (from->back_pixmap != FACE_DEFAULT)
- to->back_pixmap = from->back_pixmap;
- if (from->underline)
- to->underline = from->underline;
-}
-
-/* Return the display face associated with a buffer position POS.
- Store into *ENDPTR the position at which a different face is needed.
- This does not take account of glyphs that specify their own face codes.
- F is the frame in use for display. */
-
-struct face *
-compute_char_face (f, pos, endptr)
- struct frame *f;
- int pos;
- int *endptr;
-{
- struct face face;
- Lisp_Object prop, position, length;
- Lisp_Object overlay, start, end;
- int i, j, noverlays;
- int facecode;
- int endpos;
- Lisp_Object *overlay_vec;
- int len;
-
- XFASTINT (position) = pos;
- prop = Fget_text_property (position, Qface);
-
- len = 10;
- overlay_vec = (Lisp_Object *) xmalloc (len * sizeof (Lisp_Object));
- noverlays = overlays_at (pos, &overlay_vec, &len, &endpos);
-
- /* Optimize the default case. */
- if (noverlays == 0 && NILP (prop))
- return FRAME_NORMAL_FACE (f);
-
- bcopy (FRAME_NORMAL_FACE (f), &face, sizeof (struct face));
-
- if (!NILP (prop))
- {
- facecode = Fface_name_id_number (prop);
- if (facecode >= 0 && facecode < f->n_faces && f->faces[facecode] != 0)
- merge_faces (f->faces[facecode], &face);
- }
-
- /* Discard invalid overlays from the vector. */
- for (i = 0, j = 0; i < noverlays; i++)
- {
- overlay = overlay_vec[i];
-
- if (OVERLAY_VALID (overlay)
- && OVERLAY_POSITION (OVERLAY_START (overlay)) > 0
- && OVERLAY_POSITION (OVERLAY_END (overlay)) > 0)
- overlay_vec[j++] = overlay;
- }
- noverlays = j;
-
- /* Sort the overlays into the proper order. */
-
- /* Now merge the overlay data in that order. */
-
- for (i = 0; i < noverlays; i++)
- {
- prop = Foverlay_get (overlay_vec[i], Qface);
- if (!NILP (prop))
- {
- Lisp_Object oend;
- int oendpos;
-
- facecode = Fface_name_id_number (prop);
- if (facecode >= 0 && facecode < f->n_faces
- && f->faces[facecode] != 0)
- merge_faces (f->faces[facecode], &face);
-
- oend = OVERLAY_END (overlay_vec[i]);
- oendpos = OVERLAY_POSITION (oend);
- if (oendpos > endpos)
- endpos = oendpos;
- }
- }
-
- xfree (overlay_vec);
-
- *endptr = endpos;
-
- return get_display_face (f, &face);
-}
-
-/* Return the display face to use to display a special glyph
- which selects FACE_CODE as the face ID,
- assuming that ordinarily the face would be BASIC_FACE.
- F is the frame. */
-
-struct face *
-compute_glyph_face (f, basic_face, face_code)
- struct frame *f;
- struct face *basic_face;
- int face_code;
-{
- struct face face;
-
- bcopy (basic_face, &face, sizeof (struct face));
-
- if (face_code >= 0 && face_code < f->n_faces && f->faces[face_code] != 0)
- merge_faces (f->faces[face_code], &face);
-
- return get_display_face (f, &face);
-}
-\f
-/* 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);
-}
-
-\f
-/* Allocate a new face */
-static struct face *
-allocate_face ()
-{
- struct face *result = (struct face *) xmalloc (sizeof (struct face));
- bzero (result, sizeof (struct face));
- result->font = (XFontStruct *) FACE_DEFAULT;
- result->foreground = FACE_DEFAULT;
- result->background = FACE_DEFAULT;
- result->back_pixmap = FACE_DEFAULT;
- 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 ();
-}
-\f
-/* 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;
-
- if (NILP (name))
- return (XFontStruct *) FACE_DEFAULT;
-
- 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;
-
- if (NILP (name))
- return FACE_DEFAULT;
-
- 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 */
-
-\f
-/* 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;
-}
-
-\f
-/* 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++);
-}
-\f
-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);
-}
+/* "Face" primitives.
+ Copyright (C) 1993, 1994 Free Software Foundation.
+
+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., 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA. */
+
+/* This is derived from work by Lucid (some parts very loosely so). */
+
+#include <sys/types.h>
+#include <sys/stat.h>
+
+#include <config.h>
+#include "lisp.h"
+
+#include "charset.h"
+
+#include "frame.h"
+
+/* The number of face-id's in use (same for all frames). */
+static int next_face_id;
+
+#ifdef HAVE_FACES
+
+#ifdef HAVE_X_WINDOWS
+#include "xterm.h"
+#include "fontset.h"
+#endif
+#ifdef MSDOS
+#include "dosfns.h"
+#endif
+#include "buffer.h"
+#include "dispextern.h"
+#include "blockinput.h"
+#include "window.h"
+#include "intervals.h"
+
+#ifdef HAVE_X_WINDOWS
+/* Compensate for bug in Xos.h on some systems, on which it requires
+ time.h. On some such systems, Xos.h tries to redefine struct
+ timeval and struct timezone if USG is #defined while it is
+ #included. */
+#ifdef XOS_NEEDS_TIME_H
+
+#include <time.h>
+#undef USG
+#include <X11/Xos.h>
+#define USG
+#define __TIMEVAL__
+
+#else
+
+#include <X11/Xos.h>
+
+#endif
+#endif /* HAVE_X_WINDOWS */
+\f
+/* An explanation of the face data structures. */
+
+/* ========================= Face Data Structures =========================
+
+ Let FACE-NAME be a symbol naming a face.
+
+ Let FACE-VECTOR be (assq FACE-NAME (frame-face-alist FRAME))
+ FACE-VECTOR is either nil, or a vector of the form
+ [face NAME ID FONT FOREGROUND BACKGROUND BACKGROUND-PIXMAP UNDERLINE-P]
+ where
+ face is the symbol `face',
+ NAME is the symbol with which this vector is associated (a backpointer),
+ ID is the face ID, an integer used internally by the C code to identify
+ the face,
+ FONT, FOREGROUND, and BACKGROUND are strings naming the fonts and colors
+ to use with the face, FONT may name fontsets,
+ BACKGROUND-PIXMAP is the name of an x bitmap filename, which we don't
+ use right now, and
+ UNDERLINE-P is non-nil if the face should be underlined.
+ If any of these elements are nil, that parameter is considered
+ unspecified; parameters from faces specified by lower-priority
+ overlays or text properties, or the parameters of the frame itself,
+ can show through. (lisp/faces.el maintains these lists.)
+
+ (assq FACE-NAME global-face-data) returns a vector describing the
+ global parameters for that face.
+
+ Let PARAM-FACE be FRAME->output_data.x->param_faces[Faref (FACE-VECTOR, 2)].
+ PARAM_FACE is a struct face whose members are the Xlib analogues of
+ the parameters in FACE-VECTOR. If an element of FACE-VECTOR is
+ nil, then the corresponding member of PARAM_FACE is FACE_DEFAULT.
+ These faces are called "parameter faces", because they're the ones
+ lisp manipulates to control what gets displayed. Elements 0 and 1
+ of FRAME->output_data.x->param_faces are special - they describe the
+ default and mode line faces. None of the faces in param_faces have
+ GC's. (See src/dispextern.h for the definition of struct face.
+ lisp/faces.el maintains the isomorphism between face_alist and
+ param_faces.)
+
+ The functions compute_char_face and compute_glyph_face find and
+ combine the parameter faces associated with overlays and text
+ properties. The resulting faces are called "computed faces"; none
+ of their members are FACE_DEFAULT; they are completely specified.
+ They then call intern_compute_face to search
+ FRAME->output_data.x->computed_faces for a matching face, add one if
+ none is found, and return the index into
+ FRAME->output_data.x->computed_faces. FRAME's glyph matrices use these
+ indices to record the faces of the matrix characters, and the X
+ display hooks consult compute_faces to decide how to display these
+ characters. Elements 0 and 1 of computed_faces always describe the
+ default and mode-line faces.
+
+ Each computed face belongs to a particular frame.
+
+ Computed faces have graphics contexts some of the time.
+ intern_face builds a GC for a specified computed face
+ if it doesn't have one already.
+ clear_face_cache clears out the GCs of all computed faces.
+ This is done from time to time so that we don't hold on to
+ lots of GCs that are no longer needed.
+
+ If a computed face has 0 as its font,
+ it is unused, and can be reused by new_computed_face.
+
+ Constraints:
+
+ Symbols naming faces must have associations on all frames; for any
+ FRAME, for all FACE-NAME, if (assq FACE-NAME (frame-face-alist
+ FRAME)) is non-nil, it must be non-nil for all frames.
+
+ Analogously, indices into param_faces must be valid on all frames;
+ if param_faces[i] is a non-zero face pointer on one frame, then it
+ must be filled in on all frames. Code assumes that face ID's can
+ be used on any frame.
+
+ Some subtleties:
+
+ Why do we keep param_faces and computed_faces separate?
+ computed_faces contains an element for every combination of facial
+ parameters we have ever displayed. indices into param_faces have
+ to be valid on all frames. If they were the same array, then that
+ array would grow very large on all frames, because any facial
+ combination displayed on any frame would need to be a valid entry
+ on all frames. */
+\f
+/* Definitions and declarations. */
+
+/* The number of the face to use to indicate the region. */
+static int region_face;
+
+/* This is what appears in a slot in a face to signify that the face
+ does not specify that display aspect. */
+#define FACE_DEFAULT (~0)
+
+Lisp_Object Qface, Qmouse_face;
+Lisp_Object Qpixmap_spec_p;
+
+int face_name_id_number ( /* FRAME_PTR, Lisp_Object name */ );
+
+struct face *intern_face ( /* FRAME_PTR, struct face * */ );
+static int new_computed_face ( /* FRAME_PTR, struct face * */ );
+static int intern_computed_face ( /* FRAME_PTR, struct face * */ );
+static void ensure_face_ready ( /* FRAME_PTR, int id */ );
+void recompute_basic_faces ( /* FRAME_PTR f */ );
+static void merge_face_list ( /* FRAME_PTR, struct face *, Lisp_Object */ );
+
+extern Lisp_Object Qforeground_color, Qbackground_color;
+\f
+/* Allocating, copying, and comparing struct faces. */
+
+/* Allocate a new face */
+static struct face *
+allocate_face ()
+{
+ struct face *result = (struct face *) xmalloc (sizeof (struct face));
+ bzero (result, sizeof (struct face));
+ result->font = (XFontStruct *) FACE_DEFAULT;
+ result->fontset = -1;
+ result->foreground = FACE_DEFAULT;
+ result->background = FACE_DEFAULT;
+ result->stipple = FACE_DEFAULT;
+ return result;
+}
+
+/* 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->fontset = face->fontset;
+ result->foreground = face->foreground;
+ result->background = face->background;
+ result->stipple = face->stipple;
+ result->underline = face->underline;
+ result->pixmap_h = face->pixmap_h;
+ result->pixmap_w = face->pixmap_w;
+
+ return result;
+}
+
+static int
+face_eql (face1, face2)
+ struct face *face1, *face2;
+{
+ return ( face1->font == face2->font
+ && face1->fontset == face2->fontset
+ && face1->foreground == face2->foreground
+ && face1->background == face2->background
+ && face1->stipple == face2->stipple
+ && face1->underline == face2->underline);
+}
+\f
+/* Managing graphics contexts of faces. */
+
+#ifdef HAVE_X_WINDOWS
+/* Given a computed face, construct its graphics context if necessary. */
+
+struct face *
+intern_face (f, face)
+ struct frame *f;
+ struct face *face;
+{
+ GC gc;
+ XGCValues xgcv;
+ unsigned long mask;
+
+ if (face->gc)
+ return face;
+
+ BLOCK_INPUT;
+
+ if (face->foreground != FACE_DEFAULT)
+ xgcv.foreground = face->foreground;
+ else
+ xgcv.foreground = f->output_data.x->foreground_pixel;
+
+ if (face->background != FACE_DEFAULT)
+ xgcv.background = face->background;
+ else
+ xgcv.background = f->output_data.x->background_pixel;
+
+ if (face->font && face->font != (XFontStruct *) FACE_DEFAULT)
+ xgcv.font = face->font->fid;
+ else
+ xgcv.font = f->output_data.x->font->fid;
+
+ xgcv.graphics_exposures = 0;
+
+ mask = GCForeground | GCBackground | GCFont | GCGraphicsExposures;
+ if (face->stipple && face->stipple != FACE_DEFAULT)
+ {
+ xgcv.fill_style = FillStippled;
+ xgcv.stipple = x_bitmap_pixmap (f, face->stipple);
+ mask |= GCFillStyle | GCStipple;
+ }
+
+ gc = XCreateGC (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f),
+ mask, &xgcv);
+
+ face->gc = gc;
+ /* We used the following GC for all non-ASCII characters by changing
+ only GCfont each time. */
+ face->non_ascii_gc = XCreateGC (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f),
+ mask, &xgcv);
+
+ UNBLOCK_INPUT;
+
+ return face;
+}
+
+/* Clear out all graphics contexts for all computed faces
+ except for the default and mode line faces.
+ This should be done from time to time just to avoid
+ keeping too many graphics contexts that are no longer needed. */
+
+void
+clear_face_cache ()
+{
+ Lisp_Object tail, frame;
+
+ BLOCK_INPUT;
+ FOR_EACH_FRAME (tail, frame)
+ {
+ FRAME_PTR f = XFRAME (frame);
+ if (FRAME_X_P (f))
+ {
+ int i;
+ Display *dpy = FRAME_X_DISPLAY (f);
+
+ for (i = 2; i < FRAME_N_COMPUTED_FACES (f); i++)
+ {
+ struct face *face = FRAME_COMPUTED_FACES (f) [i];
+ if (face->gc)
+ {
+ XFreeGC (dpy, face->gc);
+ XFreeGC (dpy, face->non_ascii_gc);
+ }
+ face->gc = 0;
+ }
+ }
+ }
+
+ UNBLOCK_INPUT;
+}
+\f
+/* Allocating, freeing, and duplicating fonts, colors, and pixmaps.
+
+ These functions operate on param faces only.
+ Computed faces get their fonts, colors and pixmaps
+ by merging param faces. */
+
+static XFontStruct *
+load_font (f, name)
+ struct frame *f;
+ Lisp_Object name;
+{
+ XFontStruct *font;
+
+ if (NILP (name))
+ return (XFontStruct *) FACE_DEFAULT;
+
+ CHECK_STRING (name, 0);
+ BLOCK_INPUT;
+ font = XLoadQueryFont (FRAME_X_DISPLAY (f), (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;
+{
+ int len = FRAME_N_COMPUTED_FACES (f);
+ int i;
+
+ if (!font || font == ((XFontStruct *) FACE_DEFAULT))
+ return;
+
+ BLOCK_INPUT;
+ /* Invalidate any computed faces which use this font,
+ and free their GC's if they have any. */
+ for (i = 2; i < len; i++)
+ {
+ struct face *face = FRAME_COMPUTED_FACES (f)[i];
+ if (face->font == font)
+ {
+ Display *dpy = FRAME_X_DISPLAY (f);
+ if (face->gc)
+ XFreeGC (dpy, face->gc);
+ face->gc = 0;
+ /* This marks the computed face as available to reuse. */
+ face->font = 0;
+ }
+ }
+
+ XFreeFont (FRAME_X_DISPLAY (f), font);
+ UNBLOCK_INPUT;
+}
+
+static unsigned long
+load_color (f, name)
+ struct frame *f;
+ Lisp_Object name;
+{
+ XColor color;
+ int result;
+
+ if (NILP (name))
+ return FACE_DEFAULT;
+
+ CHECK_STRING (name, 0);
+ /* if the colormap is full, defined_color will return a best match
+ to the values in an an existing cell. */
+ result = defined_color (f, (char *) XSTRING (name)->data, &color, 1);
+ if (! result)
+ Fsignal (Qerror, Fcons (build_string ("undefined color"),
+ Fcons (name, Qnil)));
+ return (unsigned long) color.pixel;
+}
+
+static void
+unload_color (f, pixel)
+ struct frame *f;
+ unsigned long pixel;
+{
+ Colormap cmap;
+ Display *dpy = FRAME_X_DISPLAY (f);
+ int class = FRAME_X_DISPLAY_INFO (f)->visual->class;
+
+ if (pixel == FACE_DEFAULT
+ || pixel == BLACK_PIX_DEFAULT (f)
+ || pixel == WHITE_PIX_DEFAULT (f))
+ return;
+ cmap = DefaultColormapOfScreen (DefaultScreenOfDisplay (dpy));
+
+ /* If display has an immutable color map, freeing colors is not
+ necessary and some servers don't allow it. So don't do it. */
+ if (! (class == StaticColor || class == StaticGray || class == TrueColor))
+ {
+ int len = FRAME_N_COMPUTED_FACES (f);
+ int i;
+
+ BLOCK_INPUT;
+ /* Invalidate any computed faces which use this color,
+ and free their GC's if they have any. */
+ for (i = 2; i < len; i++)
+ {
+ struct face *face = FRAME_COMPUTED_FACES (f)[i];
+ if (face->foreground == pixel
+ || face->background == pixel)
+ {
+ Display *dpy = FRAME_X_DISPLAY (f);
+ if (face->gc)
+ XFreeGC (dpy, face->gc);
+ face->gc = 0;
+ /* This marks the computed face as available to reuse. */
+ face->font = 0;
+ }
+ }
+
+ XFreeColors (dpy, cmap, &pixel, 1, (unsigned long)0);
+ UNBLOCK_INPUT;
+ }
+}
+
+DEFUN ("pixmap-spec-p", Fpixmap_spec_p, Spixmap_spec_p, 1, 1, 0,
+ "Return t if OBJECT is a valid pixmap specification.")
+ (object)
+ Lisp_Object object;
+{
+ Lisp_Object height, width;
+
+ return ((STRINGP (object)
+ || (CONSP (object)
+ && CONSP (XCONS (object)->cdr)
+ && CONSP (XCONS (XCONS (object)->cdr)->cdr)
+ && NILP (XCONS (XCONS (XCONS (object)->cdr)->cdr)->cdr)
+ && (width = XCONS (object)->car, INTEGERP (width))
+ && (height = XCONS (XCONS (object)->cdr)->car, INTEGERP (height))
+ && STRINGP (XCONS (XCONS (XCONS (object)->cdr)->cdr)->car)
+ && XINT (width) > 0
+ && XINT (height) > 0
+ /* The string must have enough bits for width * height. */
+ && ((XSTRING (XCONS (XCONS (XCONS (object)->cdr)->cdr)->car)->size
+ * (BITS_PER_INT / sizeof (int)))
+ >= XFASTINT (width) * XFASTINT (height))))
+ ? Qt : Qnil);
+}
+
+/* Load a bitmap according to NAME (which is either a file name
+ or a pixmap spec). Return the bitmap_id (see xfns.c)
+ or get an error if NAME is invalid.
+
+ Store the bitmap width in *W_PTR and height in *H_PTR. */
+
+static long
+load_pixmap (f, name, w_ptr, h_ptr)
+ FRAME_PTR f;
+ Lisp_Object name;
+ unsigned int *w_ptr, *h_ptr;
+{
+ int bitmap_id;
+ Lisp_Object tem;
+
+ if (NILP (name))
+ return FACE_DEFAULT;
+
+ tem = Fpixmap_spec_p (name);
+ if (NILP (tem))
+ wrong_type_argument (Qpixmap_spec_p, name);
+
+ BLOCK_INPUT;
+
+ if (CONSP (name))
+ {
+ /* Decode a bitmap spec into a bitmap. */
+
+ int h, w;
+ Lisp_Object bits;
+
+ w = XINT (Fcar (name));
+ h = XINT (Fcar (Fcdr (name)));
+ bits = Fcar (Fcdr (Fcdr (name)));
+
+ bitmap_id = x_create_bitmap_from_data (f, XSTRING (bits)->data,
+ w, h);
+ }
+ else
+ {
+ /* It must be a string -- a file name. */
+ bitmap_id = x_create_bitmap_from_file (f, name);
+ }
+ UNBLOCK_INPUT;
+
+ if (bitmap_id < 0)
+ Fsignal (Qerror, Fcons (build_string ("invalid or undefined bitmap"),
+ Fcons (name, Qnil)));
+
+ *w_ptr = x_bitmap_width (f, bitmap_id);
+ *h_ptr = x_bitmap_height (f, bitmap_id);
+
+ return bitmap_id;
+}
+
+#else /* !HAVE_X_WINDOWS */
+
+/* Stubs for MSDOS when not under X. */
+
+struct face *
+intern_face (f, face)
+ struct frame *f;
+ struct face *face;
+{
+ return face;
+}
+
+void
+clear_face_cache ()
+{
+ /* No action. */
+}
+
+#ifdef MSDOS
+unsigned long
+load_color (f, name)
+ FRAME_PTR f;
+ Lisp_Object name;
+{
+ Lisp_Object result;
+
+ if (NILP (name))
+ return FACE_DEFAULT;
+
+ CHECK_STRING (name, 0);
+ result = call1 (Qmsdos_color_translate, name);
+ if (INTEGERP (result))
+ return XINT (result);
+ else
+ Fsignal (Qerror, Fcons (build_string ("undefined color"),
+ Fcons (name, Qnil)));
+}
+#endif
+#endif /* !HAVE_X_WINDOWS */
+
+\f
+/* Managing parameter face arrays for frames. */
+
+void
+init_frame_faces (f)
+ FRAME_PTR f;
+{
+ ensure_face_ready (f, 0);
+ ensure_face_ready (f, 1);
+
+ FRAME_N_COMPUTED_FACES (f) = 0;
+ FRAME_SIZE_COMPUTED_FACES (f) = 0;
+
+ new_computed_face (f, FRAME_PARAM_FACES (f)[0]);
+ new_computed_face (f, FRAME_PARAM_FACES (f)[1]);
+ recompute_basic_faces (f);
+
+ /* Find another X frame. */
+ {
+ Lisp_Object tail, frame, result;
+
+ result = Qnil;
+ FOR_EACH_FRAME (tail, frame)
+ if ((FRAME_MSDOS_P (XFRAME (frame)) || FRAME_X_P (XFRAME (frame)))
+ && XFRAME (frame) != f)
+ {
+ result = frame;
+ break;
+ }
+
+ /* If we didn't find any X frames other than f, then we don't need
+ any faces other than 0 and 1, so we're okay. Otherwise, make
+ sure that all faces valid on the selected frame are also valid
+ on this new frame. */
+ if (FRAMEP (result))
+ {
+ int i;
+ int n_faces = FRAME_N_PARAM_FACES (XFRAME (result));
+ struct face **faces = FRAME_PARAM_FACES (XFRAME (result));
+
+ for (i = 2; i < n_faces; i++)
+ if (faces[i])
+ ensure_face_ready (f, i);
+ }
+ }
+}
+
+
+/* Called from Fdelete_frame. */
+
+void
+free_frame_faces (f)
+ struct frame *f;
+{
+ Display *dpy = FRAME_X_DISPLAY (f);
+ int i;
+
+ BLOCK_INPUT;
+
+ for (i = 0; i < FRAME_N_PARAM_FACES (f); i++)
+ {
+ struct face *face = FRAME_PARAM_FACES (f) [i];
+ if (face)
+ {
+ if (face->fontset < 0)
+ unload_font (f, face->font);
+ unload_color (f, face->foreground);
+ unload_color (f, face->background);
+ x_destroy_bitmap (f, face->stipple);
+ xfree (face);
+ }
+ }
+ xfree (FRAME_PARAM_FACES (f));
+ FRAME_PARAM_FACES (f) = 0;
+ FRAME_N_PARAM_FACES (f) = 0;
+
+ /* All faces in FRAME_COMPUTED_FACES use resources copied from
+ FRAME_PARAM_FACES; we can free them without fuss.
+ But we do free the GCs and the face objects themselves. */
+ for (i = 0; i < FRAME_N_COMPUTED_FACES (f); i++)
+ {
+ struct face *face = FRAME_COMPUTED_FACES (f) [i];
+ if (face)
+ {
+ if (face->gc)
+ {
+ XFreeGC (dpy, face->gc);
+ XFreeGC (dpy, face->non_ascii_gc);
+ }
+ xfree (face);
+ }
+ }
+ xfree (FRAME_COMPUTED_FACES (f));
+ FRAME_COMPUTED_FACES (f) = 0;
+ FRAME_N_COMPUTED_FACES (f) = 0;
+
+ UNBLOCK_INPUT;
+}
+\f
+/* Interning faces in a frame's face array. */
+
+static int
+new_computed_face (f, new_face)
+ struct frame *f;
+ struct face *new_face;
+{
+ int len = FRAME_N_COMPUTED_FACES (f);
+ int i;
+
+ /* Search for an unused computed face in the middle of the table. */
+ for (i = 0; i < len; i++)
+ {
+ struct face *face = FRAME_COMPUTED_FACES (f)[i];
+ if (face->font == 0)
+ {
+ FRAME_COMPUTED_FACES (f)[i] = copy_face (new_face);
+ return i;
+ }
+ }
+
+ if (i >= FRAME_SIZE_COMPUTED_FACES (f))
+ {
+ int new_size = i + 32;
+
+ FRAME_COMPUTED_FACES (f)
+ = (struct face **) (FRAME_SIZE_COMPUTED_FACES (f) == 0
+ ? xmalloc (new_size * sizeof (struct face *))
+ : xrealloc (FRAME_COMPUTED_FACES (f),
+ new_size * sizeof (struct face *)));
+ FRAME_SIZE_COMPUTED_FACES (f) = new_size;
+ }
+
+ i = FRAME_N_COMPUTED_FACES (f)++;
+ FRAME_COMPUTED_FACES (f)[i] = copy_face (new_face);
+ return i;
+}
+
+
+/* Find a match for NEW_FACE in a FRAME's computed face array, and add
+ it if we don't find one. */
+static int
+intern_computed_face (f, new_face)
+ struct frame *f;
+ struct face *new_face;
+{
+ int len = FRAME_N_COMPUTED_FACES (f);
+ int i;
+
+ /* Search for a computed face already on F equivalent to FACE. */
+ for (i = 0; i < len; i++)
+ {
+ if (! FRAME_COMPUTED_FACES (f)[i])
+ abort ();
+ if (face_eql (new_face, FRAME_COMPUTED_FACES (f)[i]))
+ return i;
+ }
+
+ /* We didn't find one; add a new one. */
+ return new_computed_face (f, new_face);
+}
+
+/* Make parameter face id ID valid on frame F. */
+
+static void
+ensure_face_ready (f, id)
+ struct frame *f;
+ int id;
+{
+ if (FRAME_N_PARAM_FACES (f) <= id)
+ {
+ int n = id + 10;
+ int i;
+ if (!FRAME_N_PARAM_FACES (f))
+ FRAME_PARAM_FACES (f)
+ = (struct face **) xmalloc (sizeof (struct face *) * n);
+ else
+ FRAME_PARAM_FACES (f)
+ = (struct face **) xrealloc (FRAME_PARAM_FACES (f),
+ sizeof (struct face *) * n);
+
+ bzero (FRAME_PARAM_FACES (f) + FRAME_N_PARAM_FACES (f),
+ (n - FRAME_N_PARAM_FACES (f)) * sizeof (struct face *));
+ FRAME_N_PARAM_FACES (f) = n;
+ }
+
+ if (FRAME_PARAM_FACES (f) [id] == 0)
+ FRAME_PARAM_FACES (f) [id] = allocate_face ();
+}
+\f
+#ifdef HAVE_X_WINDOWS
+/* Return non-zero if FONT1 and FONT2 have the same width.
+ We do not check the height, because we can now deal with
+ different heights.
+ We assume that they're both character-cell fonts. */
+
+int
+same_size_fonts (font1, font2)
+ XFontStruct *font1, *font2;
+{
+ XCharStruct *bounds1 = &font1->min_bounds;
+ XCharStruct *bounds2 = &font2->min_bounds;
+
+ return (bounds1->width == bounds2->width);
+}
+
+/* Update the line_height of frame F according to the biggest font in
+ any face. Return nonzero if if line_height changes. */
+
+int
+frame_update_line_height (f)
+ FRAME_PTR f;
+{
+ int i;
+ int fontset = f->output_data.x->fontset;
+ int biggest = (fontset > 0
+ ? FRAME_FONTSET_DATA (f)->fontset_table[fontset]->height
+ : FONT_HEIGHT (f->output_data.x->font));
+
+ for (i = 0; i < f->output_data.x->n_param_faces; i++)
+ if (f->output_data.x->param_faces[i] != 0
+ && f->output_data.x->param_faces[i]->font != (XFontStruct *) FACE_DEFAULT)
+ {
+ int height = ((fontset = f->output_data.x->param_faces[i]->fontset) > 0
+ ? FRAME_FONTSET_DATA (f)->fontset_table[fontset]->height
+ : FONT_HEIGHT (f->output_data.x->param_faces[i]->font));
+
+ if (height > biggest)
+ biggest = height;
+ }
+
+ if (biggest == f->output_data.x->line_height)
+ return 0;
+
+ f->output_data.x->line_height = biggest;
+ return 1;
+}
+#endif /* not HAVE_X_WINDOWS */
+\f
+/* Modify face TO by copying from FROM all properties which have
+ nondefault settings. */
+
+static void
+merge_faces (from, to)
+ struct face *from, *to;
+{
+ /* Only merge the font if it's the same width as the base font.
+ Otherwise ignore it, since we can't handle it properly. */
+ if (from->font != (XFontStruct *) FACE_DEFAULT
+ && same_size_fonts (from->font, to->font))
+ to->font = from->font;
+ if (from->fontset != -1)
+ to->fontset = from->fontset;
+ if (from->foreground != FACE_DEFAULT)
+ to->foreground = from->foreground;
+ if (from->background != FACE_DEFAULT)
+ to->background = from->background;
+ if (from->stipple != FACE_DEFAULT)
+ {
+ to->stipple = from->stipple;
+ to->pixmap_h = from->pixmap_h;
+ to->pixmap_w = from->pixmap_w;
+ }
+ if (from->underline)
+ to->underline = from->underline;
+}
+
+/* Set up the basic set of facial parameters, based on the frame's
+ data; all faces are deltas applied to this. */
+
+static void
+compute_base_face (f, face)
+ FRAME_PTR f;
+ struct face *face;
+{
+ face->gc = 0;
+ face->foreground = FRAME_FOREGROUND_PIXEL (f);
+ face->background = FRAME_BACKGROUND_PIXEL (f);
+ face->font = FRAME_FONT (f);
+ face->fontset = -1;
+ face->stipple = 0;
+ face->underline = 0;
+}
+
+/* Return the face ID to use to display a special glyph which selects
+ FACE_CODE as the face ID, assuming that ordinarily the face would
+ be CURRENT_FACE. F is the frame. */
+
+int
+compute_glyph_face (f, face_code, current_face)
+ struct frame *f;
+ int face_code, current_face;
+{
+ struct face face;
+
+ face = *FRAME_COMPUTED_FACES (f)[current_face];
+
+ if (face_code >= 0 && face_code < FRAME_N_PARAM_FACES (f)
+ && FRAME_PARAM_FACES (f) [face_code] != 0)
+ merge_faces (FRAME_PARAM_FACES (f) [face_code], &face);
+
+ return intern_computed_face (f, &face);
+}
+
+/* Return the face ID to use to display a special glyph which selects
+ FACE_CODE as the face ID, assuming that ordinarily the face would
+ be CURRENT_FACE. F is the frame. */
+
+int
+compute_glyph_face_1 (f, face_name, current_face)
+ struct frame *f;
+ Lisp_Object face_name;
+ int current_face;
+{
+ struct face face;
+
+ face = *FRAME_COMPUTED_FACES (f)[current_face];
+
+ if (!NILP (face_name))
+ {
+ int facecode = face_name_id_number (f, face_name);
+ if (facecode >= 0 && facecode < FRAME_N_PARAM_FACES (f)
+ && FRAME_PARAM_FACES (f) [facecode] != 0)
+ merge_faces (FRAME_PARAM_FACES (f) [facecode], &face);
+ }
+
+ return intern_computed_face (f, &face);
+}
+\f
+/* Return the face ID associated with a buffer position POS.
+ Store into *ENDPTR the position at which a different face is needed.
+ This does not take account of glyphs that specify their own face codes.
+ F is the frame in use for display, and W is a window displaying
+ the current buffer.
+
+ REGION_BEG, REGION_END delimit the region, so it can be highlighted.
+
+ LIMIT is a position not to scan beyond. That is to limit
+ the time this function can take.
+
+ If MOUSE is nonzero, use the character's mouse-face, not its face. */
+
+int
+compute_char_face (f, w, pos, region_beg, region_end, endptr, limit, mouse)
+ struct frame *f;
+ struct window *w;
+ int pos;
+ int region_beg, region_end;
+ int *endptr;
+ int limit;
+ int mouse;
+{
+ struct face face;
+ Lisp_Object prop, position;
+ int i, j, noverlays;
+ int facecode;
+ Lisp_Object *overlay_vec;
+ Lisp_Object frame;
+ int endpos;
+ Lisp_Object propname;
+
+ /* W must display the current buffer. We could write this function
+ to use the frame and buffer of W, but right now it doesn't. */
+ if (XBUFFER (w->buffer) != current_buffer)
+ abort ();
+
+ XSETFRAME (frame, f);
+
+ endpos = ZV;
+ if (pos < region_beg && region_beg < endpos)
+ endpos = region_beg;
+
+ XSETFASTINT (position, pos);
+
+ if (mouse)
+ propname = Qmouse_face;
+ else
+ propname = Qface;
+
+ prop = Fget_text_property (position, propname, w->buffer);
+
+ {
+ Lisp_Object limit1, end;
+
+ XSETFASTINT (limit1, (limit < endpos ? limit : endpos));
+ end = Fnext_single_property_change (position, propname, w->buffer, limit1);
+ if (INTEGERP (end))
+ endpos = XINT (end);
+ }
+
+ {
+ int next_overlay;
+ int len;
+
+ /* First try with room for 40 overlays. */
+ len = 40;
+ overlay_vec = (Lisp_Object *) alloca (len * sizeof (Lisp_Object));
+
+ noverlays = overlays_at (pos, 0, &overlay_vec, &len,
+ &next_overlay, (int *) 0);
+
+ /* If there are more than 40,
+ make enough space for all, and try again. */
+ if (noverlays > len)
+ {
+ len = noverlays;
+ overlay_vec = (Lisp_Object *) alloca (len * sizeof (Lisp_Object));
+ noverlays = overlays_at (pos, 0, &overlay_vec, &len,
+ &next_overlay, (int *) 0);
+ }
+
+ if (next_overlay < endpos)
+ endpos = next_overlay;
+ }
+
+ *endptr = endpos;
+
+ /* Optimize the default case. */
+ if (noverlays == 0 && NILP (prop)
+ && !(pos >= region_beg && pos < region_end))
+ return 0;
+
+ compute_base_face (f, &face);
+
+ merge_face_list (f, &face, prop);
+
+ noverlays = sort_overlays (overlay_vec, noverlays, w);
+
+ /* Now merge the overlay data in that order. */
+ for (i = 0; i < noverlays; i++)
+ {
+ Lisp_Object oend;
+ int oendpos;
+
+ prop = Foverlay_get (overlay_vec[i], propname);
+ merge_face_list (f, &face, prop);
+
+ oend = OVERLAY_END (overlay_vec[i]);
+ oendpos = OVERLAY_POSITION (oend);
+ if (oendpos < endpos)
+ endpos = oendpos;
+ }
+
+ if (pos >= region_beg && pos < region_end)
+ {
+ if (region_end < endpos)
+ endpos = region_end;
+ if (region_face >= 0 && region_face < next_face_id)
+ merge_faces (FRAME_PARAM_FACES (f)[region_face], &face);
+ }
+
+ *endptr = endpos;
+
+ return intern_computed_face (f, &face);
+}
+
+static void
+merge_face_list (f, face, prop)
+ FRAME_PTR f;
+ struct face *face;
+ Lisp_Object prop;
+{
+ Lisp_Object length;
+ int len;
+ Lisp_Object *faces;
+ int j;
+
+ if (CONSP (prop)
+ && ! STRINGP (XCONS (prop)->cdr))
+ {
+ /* We have a list of faces, merge them in reverse order. */
+
+ length = Fsafe_length (prop);
+ len = XFASTINT (length);
+
+ /* Put them into an array. */
+ faces = (Lisp_Object *) alloca (len * sizeof (Lisp_Object));
+ for (j = 0; j < len; j++)
+ {
+ faces[j] = Fcar (prop);
+ prop = Fcdr (prop);
+ }
+ /* So that we can merge them in the reverse order. */
+ }
+ else
+ {
+ faces = (Lisp_Object *) alloca (sizeof (Lisp_Object));
+ faces[0] = prop;
+ len = 1;
+ }
+
+ for (j = len - 1; j >= 0; j--)
+ {
+ if (CONSP (faces[j]))
+ {
+ if (EQ (XCONS (faces[j])->car, Qbackground_color))
+ face->background = load_color (f, XCONS (faces[j])->cdr);
+ if (EQ (XCONS (faces[j])->car, Qforeground_color))
+ face->foreground = load_color (f, XCONS (faces[j])->cdr);
+ }
+ else
+ {
+ int facecode = face_name_id_number (f, faces[j]);
+ if (facecode >= 0 && facecode < FRAME_N_PARAM_FACES (f)
+ && FRAME_PARAM_FACES (f) [facecode] != 0)
+ merge_faces (FRAME_PARAM_FACES (f) [facecode], face);
+ }
+ }
+}
+
+\f
+/* Recompute the GC's for the default and modeline faces.
+ We call this after changing frame parameters on which those GC's
+ depend. */
+
+void
+recompute_basic_faces (f)
+ FRAME_PTR f;
+{
+ /* If the frame's faces haven't been initialized yet, don't worry about
+ this stuff. */
+ if (FRAME_N_PARAM_FACES (f) < 2)
+ return;
+
+ BLOCK_INPUT;
+
+ if (FRAME_DEFAULT_FACE (f)->gc)
+ {
+ XFreeGC (FRAME_X_DISPLAY (f), FRAME_DEFAULT_FACE (f)->gc);
+ XFreeGC (FRAME_X_DISPLAY (f), FRAME_DEFAULT_FACE (f)->non_ascii_gc);
+ }
+ if (FRAME_MODE_LINE_FACE (f)->gc)
+ {
+ XFreeGC (FRAME_X_DISPLAY (f), FRAME_MODE_LINE_FACE (f)->gc);
+ XFreeGC (FRAME_X_DISPLAY (f), FRAME_MODE_LINE_FACE (f)->non_ascii_gc);
+ }
+ compute_base_face (f, FRAME_DEFAULT_FACE (f));
+ compute_base_face (f, FRAME_MODE_LINE_FACE (f));
+
+ merge_faces (FRAME_DEFAULT_PARAM_FACE (f), FRAME_DEFAULT_FACE (f));
+ merge_faces (FRAME_MODE_LINE_PARAM_FACE (f), FRAME_MODE_LINE_FACE (f));
+
+ intern_face (f, FRAME_DEFAULT_FACE (f));
+ intern_face (f, FRAME_MODE_LINE_FACE (f));
+
+ UNBLOCK_INPUT;
+}
+
+
+\f
+/* Lisp interface. */
+
+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, frame;
+ int id = XINT (face_id);
+
+ CHECK_NUMBER (face_id, 0);
+ if (id < 0 || id >= next_face_id)
+ error ("Face id out of range");
+
+ FOR_EACH_FRAME (rest, frame)
+ {
+ if (FRAME_MSDOS_P (XFRAME (frame)) || FRAME_X_P (XFRAME (frame)))
+ ensure_face_ready (XFRAME (frame), 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;
+ int garbaged = 0;
+
+ CHECK_FRAME (frame, 0);
+ CHECK_NUMBER (face_id, 0);
+ CHECK_SYMBOL (attr_name, 0);
+
+ f = XFRAME (frame);
+ id = XINT (face_id);
+ if (id < 0 || id >= next_face_id)
+ error ("Face id out of range");
+
+ if (! FRAME_X_P (f) && ! FRAME_MSDOS_P (f))
+ return Qnil;
+
+ ensure_face_ready (f, id);
+ face = FRAME_PARAM_FACES (f) [XFASTINT (face_id)];
+
+ if (EQ (attr_name, intern ("font")))
+ {
+#if defined (MSDOS) && !defined (HAVE_X_WINDOWS)
+ /* The one and only font. Must *not* be zero (which
+ is taken to mean an unused face nowadays). */
+ face->font = (XFontStruct *)1 ;
+#else
+ XFontStruct *font;
+ int fontset;
+
+ if (NILP (attr_value))
+ {
+ font = (XFontStruct *) FACE_DEFAULT;
+ fontset = -1;
+ }
+ else
+ {
+ CHECK_STRING (attr_value, 0);
+ fontset = fs_query_fontset (f, XSTRING (attr_value)->data);
+ if (fontset >= 0)
+ {
+ struct font_info *fontp;
+
+ if (!(fontp = FS_LOAD_FONT (f, FRAME_X_FONT_TABLE (f),
+ CHARSET_ASCII, NULL, fontset)))
+ Fsignal (Qerror,
+ Fcons (build_string ("ASCII font can't be loaded"),
+ Fcons (attr_value, Qnil)));
+ font = (XFontStruct *) (fontp->font);
+ }
+ else
+ font = load_font (f, attr_value);
+ }
+
+ if (face->fontset == -1 && face->font != f->output_data.x->font)
+ unload_font (f, face->font);
+
+ face->font = font;
+ face->fontset = fontset;
+ if (frame_update_line_height (f))
+ x_set_window_size (f, 0, f->width, f->height);
+ /* Must clear cache, since it might contain the font
+ we just got rid of. */
+ garbaged = 1;
+#endif
+ }
+ else if (EQ (attr_name, intern ("foreground")))
+ {
+ unsigned long new_color = load_color (f, attr_value);
+ unload_color (f, face->foreground);
+ face->foreground = new_color;
+ garbaged = 1;
+ }
+ else if (EQ (attr_name, intern ("background")))
+ {
+ unsigned long new_color = load_color (f, attr_value);
+ unload_color (f, face->background);
+ face->background = new_color;
+ garbaged = 1;
+ }
+ else if (EQ (attr_name, intern ("background-pixmap")))
+ {
+ unsigned int w, h;
+ unsigned long new_pixmap = load_pixmap (f, attr_value, &w, &h);
+ x_destroy_bitmap (f, face->stipple);
+ face->stipple = new_pixmap;
+ face->pixmap_w = w;
+ face->pixmap_h = h;
+ garbaged = 1;
+ }
+ else if (EQ (attr_name, intern ("underline")))
+ {
+ int new = !NILP (attr_value);
+ face->underline = new;
+ }
+ else
+ error ("unknown face attribute");
+
+ if (id == 0 || id == 1)
+ recompute_basic_faces (f);
+
+ /* We must redraw the frame whenever any face font or color changes,
+ because it's possible that a merged (display) face
+ contains the font or color we just replaced.
+ And we must inhibit any Expose events until the redraw is done,
+ since they would try to use the invalid display faces. */
+ if (garbaged)
+ {
+ SET_FRAME_GARBAGED (f);
+#ifdef HAVE_X_WINDOWS
+ FRAME_X_DISPLAY_INFO (f)->mouse_face_defer = 1;
+#endif
+ }
+
+ return Qnil;
+}
+/* Return the face id for name NAME on frame FRAME.
+ (It should be the same for all frames,
+ but it's as easy to use the "right" frame to look it up
+ as to use any other one.) */
+
+int
+face_name_id_number (f, name)
+ FRAME_PTR f;
+ Lisp_Object name;
+{
+ Lisp_Object tem;
+
+ tem = Fcdr (assq_no_quit (name, f->face_alist));
+ if (NILP (tem))
+ return 0;
+ CHECK_VECTOR (tem, 0);
+ tem = XVECTOR (tem)->contents[2];
+ CHECK_NUMBER (tem, 0);
+ return XINT (tem);
+}
+
+#endif /* HAVE_FACES */
+
+\f
+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 ("internal-next-face-id", Finternal_next_face_id, Sinternal_next_face_id,
+ 0, 0, 0, "")
+ ()
+{
+ return make_number (next_face_id++);
+}
+\f
+/* Emacs initialization. */
+
+void
+syms_of_xfaces ()
+{
+#ifdef HAVE_FACES
+ Qface = intern ("face");
+ staticpro (&Qface);
+ Qmouse_face = intern ("mouse-face");
+ staticpro (&Qmouse_face);
+ Qpixmap_spec_p = intern ("pixmap-spec-p");
+ staticpro (&Qpixmap_spec_p);
+
+ DEFVAR_INT ("region-face", ®ion_face,
+ "Face number to use to highlight the region\n\
+The region is highlighted with this face\n\
+when Transient Mark mode is enabled and the mark is active.");
+
+ defsubr (&Smake_face_internal);
+ defsubr (&Sset_face_attribute_internal);
+#endif /* HAVE_FACES */
+
+#ifdef HAVE_X_WINDOWS
+ defsubr (&Spixmap_spec_p);
+#endif
+
+ defsubr (&Sframe_face_alist);
+ defsubr (&Sset_frame_face_alist);
+ defsubr (&Sinternal_next_face_id);
+}
HCoop / bpt / emacs.git / blobdiff