Don't link libXft when using cairo

* configure.ac: Check cairo early.  Don't try Xft if cairo is used.
* lwlib/lwlib-utils.h [USE_CAIRO]: Include cairo.h and fontconfig.h.
(XftFont, XftDraw, XftColor, XGlyphInfo) [USE_CAIRO]: New typedefs.
(XftFontOpenName, XftFontClose, XftDrawCreate, XftDrawDestroy)
(XftDrawRect, XftDrawStringUtf8, XftTextExtentsUtf8) [USE_CAIRO]: New macros.
(crxft_font_open_name, crxft_font_close, crxft_draw_create)
(crxft_draw_rect, crxft_draw_string, crxft_text_extents) [USE_CAIRO]: New
externs.
* lwlib/lwlib-utils.c [USE_CAIRO]: Include math.h, cairo-ft.h, and
cairo-xlib.h.
(crxft_font_open_name, crxft_font_close, crxft_draw_create)
(crxft_set_source_color, crxft_draw_rect, crxft_draw_string)
(crxft_text_extents) [USE_CAIRO]: New Xft compatibility functions.
* lwlib/xlwmenuP.h [USE_CAIRO]: Include lwlib-utils.h.
* lwlib/xlwmenu.c (display_menu_item) [USE_CAIRO]: Call
cairo_surface_mark_dirty and cairo_surface_flush.
* lwlib/lwlib-Xaw.c [USE_CAIRO]: Include stdlib.h and lwlib-utils.h.
(draw_text) [USE_CAIRO]: Call cairo_surface_flush.
* src/xsettings.c [USE_CAIRO]: Include fontconfig.h
(apply_xft_settings) [!HAVE_XFT]: Don't call XftDefaultSubstitute or
XftDefaultSet.
* lwlib/lwlib-Xaw.c:
* lwlib/lwlib-int.h:
* lwlib/xlwmenu.c:
* lwlib/xlwmenuP.h:
* src/xrdb.c:
* src/xsettings.c:
* src/xterm.c: Replace all #ifdef HAVE_XFT with #if defined USE_CAIRO ||
defined HAVE_XFT.
* src/xfns.c (x_default_font_parameter): Replace #ifdef HAVE_XFT with #if
defined	USE_CAIRO || defined HAVE_XFT.

6 files changed, 236 insertions, 32 deletions

diff --git a/lwlib/lwlib-Xaw.c b/lwlib/lwlib-Xaw.c
index a00f8aa73f9..0801c944008 100644
--- a/lwlib/lwlib-Xaw.c
+++ b/lwlib/lwlib-Xaw.c
@@ -50,8 +50,13 @@ along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.  */
 
 #include <X11/Xatom.h>
 
-#ifdef HAVE_XFT
+#if defined USE_CAIRO || defined HAVE_XFT
+#ifdef USE_CAIRO
+#include <stdlib.h>
+#include "lwlib-utils.h"
+#else  /* HAVE_XFT */
 #include <X11/Xft/Xft.h>
+#endif
 
 struct widget_xft_data
 {
@@ -79,7 +84,7 @@ lw_xaw_widget_p (Widget widget)
 }
 
 
-#ifdef HAVE_XFT
+#if defined USE_CAIRO || defined HAVE_XFT
 static void
 fill_xft_data (struct widget_xft_data *data, Widget widget, XftFont *font)
 {
@@ -210,6 +215,9 @@ draw_text (struct widget_xft_data *data, char *lbl, int inverse)
       /* 1.2 gives reasonable line spacing.  */
       y += data->xft_font->height * 1.2;
     }
+#ifdef USE_CAIRO
+  cairo_surface_flush (cairo_get_target (data->xft_draw));
+#endif
 
 }
 
@@ -307,7 +315,7 @@ xaw_update_one_widget (widget_instance *instance,
   if (XtIsSubclass (widget, dialogWidgetClass))
     {
 
-#ifdef HAVE_XFT
+#if defined USE_CAIRO || defined HAVE_XFT
       if (instance->xft_data && instance->xft_data[0].xft_font)
         {
           set_text (&instance->xft_data[0], instance->parent,
@@ -339,7 +347,7 @@ xaw_update_one_widget (widget_instance *instance,
       XtSetArg (al[ac], XtNlabel, val->value);ac++;
       /* Force centered button text.  Se above. */
       XtSetArg (al[ac], XtNjustify, XtJustifyCenter);ac++;
-#ifdef HAVE_XFT
+#if defined USE_CAIRO || defined HAVE_XFT
       if (instance->xft_data && instance->xft_data[0].xft_font)
         {
           int th;
@@ -473,7 +481,7 @@ static XtActionsRec xaw_actions [] = {
 };
 static Boolean actions_initted = False;
 
-#ifdef HAVE_XFT
+#if defined USE_CAIRO || defined HAVE_XFT
 static XtActionsRec button_actions[] =
   {
     { "my_reset", command_reset },
@@ -506,7 +514,7 @@ make_dialog (char* name,
   Widget dialog;
   Widget button;
   XtTranslations override;
-#ifdef HAVE_XFT
+#if defined USE_CAIRO || defined HAVE_XFT
   XftFont *xft_font = 0;
   XtTranslations button_override;
 #endif
@@ -521,7 +529,7 @@ make_dialog (char* name,
       XtAppContext app = XtWidgetToApplicationContext (parent);
       XtAppAddActions (app, xaw_actions,
                        sizeof (xaw_actions) / sizeof (xaw_actions[0]));
-#ifdef HAVE_XFT
+#if defined USE_CAIRO || defined HAVE_XFT
       XtAppAddActions (app, button_actions,
                        sizeof (button_actions) / sizeof (button_actions[0]));
 #endif
@@ -546,7 +554,7 @@ make_dialog (char* name,
   override = XtParseTranslationTable (dialogOverride);
   XtOverrideTranslations (dialog, override);
 
-#ifdef HAVE_XFT
+#if defined USE_CAIRO || defined HAVE_XFT
   {
     int num;
     Widget *ch = NULL;
@@ -618,7 +626,7 @@ make_dialog (char* name,
       sprintf (button_name, "button%d", ++bc);
       button = XtCreateManagedWidget (button_name, commandWidgetClass,
                                       dialog, av, ac);
-#ifdef HAVE_XFT
+#if defined USE_CAIRO || defined HAVE_XFT
       if (xft_font)
         {
           fill_xft_data (&instance->xft_data[bc], button, xft_font);
@@ -651,7 +659,7 @@ make_dialog (char* name,
       sprintf (button_name, "button%d", ++bc);
       button = XtCreateManagedWidget (button_name, commandWidgetClass,
                                       dialog, av, ac);
-#ifdef HAVE_XFT
+#if defined USE_CAIRO || defined HAVE_XFT
       if (xft_font)
         {
           fill_xft_data (&instance->xft_data[bc], button, xft_font);
diff --git a/lwlib/lwlib-int.h b/lwlib/lwlib-int.h
index 28b1fb9508d..9f788e7c0c2 100644
--- a/lwlib/lwlib-int.h
+++ b/lwlib/lwlib-int.h
@@ -30,7 +30,7 @@ typedef struct _widget_instance
   Widget                widget;
   Widget                parent;
   Boolean               pop_up_p;
-#ifdef HAVE_XFT
+#if defined USE_CAIRO || defined HAVE_XFT
   struct widget_xft_data *xft_data;
 #endif
   struct _widget_info*          info;
diff --git a/lwlib/lwlib-utils.c b/lwlib/lwlib-utils.c
index 7c60bdb056d..2c0a931f9cb 100644
--- a/lwlib/lwlib-utils.c
+++ b/lwlib/lwlib-utils.c
@@ -137,3 +137,143 @@ XtWidgetBeingDestroyedP (Widget widget)
 {
   return widget->core.being_destroyed;
 }
+
+#ifdef USE_CAIRO
+/* Xft emulation on cairo.  */
+#include <math.h>
+#include <cairo-ft.h>
+#include <cairo-xlib.h>
+
+XftFont *
+crxft_font_open_name (Display *dpy, int screen, const char *name)
+{
+  XftFont *pub = NULL;
+  FcPattern *pattern = FcNameParse ((FcChar8 *) name);
+  if (pattern)
+    {
+      FcConfigSubstitute (NULL, pattern, FcMatchPattern);
+      double dpi;
+      if (FcPatternGetDouble (pattern, FC_DPI, 0, &dpi) == FcResultNoMatch)
+        {
+          char *v = XGetDefault (dpy, "Xft", FC_DPI);
+          if (v == NULL || sscanf (v, "%lf", &dpi) != 1)
+            dpi = ((DisplayHeight (dpy, screen) * 25.4)
+                   / DisplayHeightMM (dpy, screen));
+          FcPatternAddDouble (pattern, FC_DPI, dpi);
+        }
+      FcDefaultSubstitute (pattern);
+      cairo_font_face_t *font_face
+        = cairo_ft_font_face_create_for_pattern (pattern);
+      if (font_face)
+        {
+          double pixel_size;
+          if ((FcPatternGetDouble (pattern, FC_PIXEL_SIZE, 0, &pixel_size)
+               != FcResultMatch)
+              || pixel_size < 1)
+            pixel_size = 10;
+
+          pub = xmalloc (sizeof (*pub));
+          cairo_matrix_t font_matrix, ctm;
+          cairo_matrix_init_scale (&font_matrix, pixel_size, pixel_size);
+          cairo_matrix_init_identity (&ctm);
+          cairo_font_options_t *options = cairo_font_options_create ();
+          cairo_ft_font_options_substitute (options, pattern);
+          pub->scaled_font = cairo_scaled_font_create (font_face, &font_matrix,
+                                                       &ctm, options);
+          cairo_font_face_destroy (font_face);
+          cairo_font_options_destroy (options);
+
+          cairo_font_extents_t extents;
+          cairo_scaled_font_extents (pub->scaled_font, &extents);
+          pub->ascent = lround (extents.ascent);
+          pub->descent = lround (extents.descent);
+          pub->height = lround (extents.height);
+          pub->max_advance_width = lround (extents.max_x_advance);
+        }
+      FcPatternDestroy (pattern);
+    }
+  return pub;
+}
+
+void
+crxft_font_close (XftFont *pub)
+{
+  cairo_scaled_font_destroy (pub->scaled_font);
+  xfree (pub);
+}
+
+cairo_t *
+crxft_draw_create (Display *dpy, Drawable drawable, Visual *visual)
+{
+  cairo_t *cr = NULL;
+  Window root;
+  int x, y;
+  unsigned int width, height, border_width, depth;
+
+  if (!XGetGeometry (dpy, drawable, &root, &x, &y, &width, &height,
+                     &border_width, &depth))
+    return NULL;
+
+  cairo_surface_t *surface = cairo_xlib_surface_create (dpy, drawable, visual,
+                                                        width, height);
+  if (surface)
+    {
+      cr = cairo_create (surface);
+      cairo_surface_destroy (surface);
+    }
+
+  return cr;
+}
+
+static void
+crxft_set_source_color (cairo_t *cr, const XftColor *color)
+{
+  cairo_set_source_rgba (cr, color->color.red / 65535.0,
+                         color->color.green / 65535.0,
+                         color->color.blue / 65535.0,
+                         color->color.alpha / 65535.0);
+}
+
+void
+crxft_draw_rect (cairo_t *cr, const XftColor *color, int x, int y,
+                 unsigned int width, unsigned int height)
+{
+  crxft_set_source_color (cr, color);
+  cairo_rectangle (cr, x, y, width, height);
+  cairo_fill (cr);
+}
+
+void
+crxft_draw_string (cairo_t *cr, const XftColor *color, XftFont *pub,
+                   int x, int y, const FcChar8 *string, int len)
+{
+  char *buf = xmalloc (len + 1);
+  memcpy (buf, string, len);
+  buf[len] = '\0';
+  crxft_set_source_color (cr, color);
+  cairo_set_scaled_font (cr, pub->scaled_font);
+  cairo_move_to (cr, x, y);
+  cairo_show_text (cr, buf);
+  xfree (buf);
+}
+
+void
+crxft_text_extents (XftFont *pub, const FcChar8 *string, int len,
+                    XGlyphInfo *extents)
+{
+  char *buf = xmalloc (len + 1);
+  memcpy (buf, string, len);
+  buf[len] = '\0';
+  cairo_text_extents_t text_extents;
+  cairo_scaled_font_text_extents (pub->scaled_font, buf, &text_extents);
+  xfree (buf);
+  extents->x = ceil (- text_extents.x_bearing);
+  extents->y = ceil (- text_extents.y_bearing);
+  extents->width = (ceil (text_extents.x_bearing + text_extents.width)
+                    + extents->x);
+  extents->height = (ceil (text_extents.y_bearing + text_extents.height)
+                     + extents->y);
+  extents->xOff = lround (text_extents.x_advance);
+  extents->yOff = lround (text_extents.y_advance);
+}
+#endif  /* USE_CAIRO */
diff --git a/lwlib/lwlib-utils.h b/lwlib/lwlib-utils.h
index ec3daab94ef..64372f19ad2 100644
--- a/lwlib/lwlib-utils.h
+++ b/lwlib/lwlib-utils.h
@@ -15,4 +15,49 @@ Widget *XtCompositeChildren (Widget, unsigned int *);
 Boolean
 XtWidgetBeingDestroyedP (Widget widget);
 
+#ifdef USE_CAIRO
+
+#include <cairo.h>
+#include <fontconfig/fontconfig.h>
+
+typedef struct {
+  cairo_scaled_font_t *scaled_font;
+  int ascent, descent, height, max_advance_width;
+} XftFont;
+
+typedef cairo_t XftDraw;
+
+typedef struct {
+  unsigned long pixel;
+  struct {unsigned short red, green, blue, alpha;} color;
+} XftColor;
+
+#ifdef HAVE_XRENDER
+#include <X11/extensions/Xrender.h>
+#else
+typedef struct {
+  unsigned short width, height;
+  short x, y, xOff, yOff;
+} XGlyphInfo;
+#endif
+
+#define XftFontOpenName crxft_font_open_name
+extern XftFont *crxft_font_open_name (Display *, int, const char *);
+#define XftFontClose(dpy, pub) crxft_font_close (pub)
+extern void crxft_font_close (XftFont *);
+#define XftDrawCreate(dpy, drawable, visual, colormap) \
+  crxft_draw_create (dpy, drawable, visual)
+extern cairo_t *crxft_draw_create (Display *, Drawable, Visual *);
+#define XftDrawDestroy cairo_destroy
+#define XftDrawRect crxft_draw_rect
+extern void crxft_draw_rect (cairo_t *, const XftColor *, int, int,
+                             unsigned int, unsigned int);
+#define XftDrawStringUtf8 crxft_draw_string
+extern void crxft_draw_string (cairo_t *, const XftColor *, XftFont *,
+                               int, int, const FcChar8 *, int);
+#define XftTextExtentsUtf8(dpy, pub, string, len, extents) \
+  crxft_text_extents (pub, string, len, extents)
+extern void crxft_text_extents (XftFont *, const FcChar8 *, int, XGlyphInfo *);
+
+#endif  /* USE_CAIRO */
 #endif /* _LWLIB_UTILS_H_ */
diff --git a/lwlib/xlwmenu.c b/lwlib/xlwmenu.c
index a5704cbfb53..6292c840f5d 100644
--- a/lwlib/xlwmenu.c
+++ b/lwlib/xlwmenu.c
@@ -107,7 +107,7 @@ xlwMenuResources[] =
   {XtNfontSet,  XtCFontSet, XtRFontSet, sizeof(XFontSet),
      offset(menu.fontSet), XtRFontSet, NULL},
 #endif
-#ifdef HAVE_XFT
+#if defined USE_CAIRO || defined HAVE_XFT
 #define DEFAULT_FONTNAME "Sans-10"
 #else
 #define DEFAULT_FONTNAME "XtDefaultFont"
@@ -325,7 +325,7 @@ string_width (XlwMenuWidget mw, char *s)
 {
   XCharStruct xcs;
   int drop;
-#ifdef HAVE_XFT
+#if defined USE_CAIRO || defined HAVE_XFT
   if (mw->menu.xft_font)
     {
       XGlyphInfo gi;
@@ -349,7 +349,7 @@ string_width (XlwMenuWidget mw, char *s)
 
 }
 
-#ifdef HAVE_XFT
+#if defined USE_CAIRO || defined HAVE_XFT
 #define MENU_FONT_HEIGHT(mw)                                    \
   ((mw)->menu.xft_font != NULL                                  \
    ? (mw)->menu.xft_font->height                                \
@@ -965,7 +965,7 @@ display_menu_item (XlwMenuWidget mw,
   int width;
   enum menu_separator separator;
   int separator_p = lw_separator_p (val->name, &separator, 0);
-#ifdef HAVE_XFT
+#if defined USE_CAIRO || defined HAVE_XFT
   XftColor *xftfg;
 #endif
 
@@ -1005,7 +1005,7 @@ display_menu_item (XlwMenuWidget mw,
       else
         text_gc = mw->menu.disabled_gc;
       deco_gc = mw->menu.foreground_gc;
-#ifdef HAVE_XFT
+#if defined USE_CAIRO || defined HAVE_XFT
       xftfg = val->enabled ? &mw->menu.xft_fg : &mw->menu.xft_disabled_fg;
 #endif
 
@@ -1032,10 +1032,13 @@ display_menu_item (XlwMenuWidget mw,
             x_offset += ws->button_width;
 
 
-#ifdef HAVE_XFT
+#if defined USE_CAIRO || defined HAVE_XFT
           if (ws->xft_draw)
             {
               int draw_y = y + v_spacing + shadow;
+#ifdef USE_CAIRO
+              cairo_surface_mark_dirty (cairo_get_target (ws->xft_draw));
+#endif
               XftDrawStringUtf8 (ws->xft_draw, xftfg,
                                  mw->menu.xft_font,
                                  x_offset, draw_y + font_ascent,
@@ -1078,7 +1081,7 @@ display_menu_item (XlwMenuWidget mw,
                 }
               else if (val->key)
                 {
-#ifdef HAVE_XFT
+#if defined USE_CAIRO || defined HAVE_XFT
                   if (ws->xft_draw)
                     {
                       int draw_x = ws->width - ws->max_rest_width
@@ -1119,6 +1122,10 @@ display_menu_item (XlwMenuWidget mw,
               draw_shadow_rectangle (mw, ws->pixmap, x, y, width, height,
                                      True, False);
             }
+#ifdef USE_CAIRO
+          if (ws->xft_draw)
+            cairo_surface_flush (cairo_get_target (ws->xft_draw));
+#endif
 
           if (highlighted_p)
             draw_shadow_rectangle (mw, ws->pixmap, x, y, width, height, False,
@@ -1320,7 +1327,7 @@ make_windows_if_needed (XlwMenuWidget mw, int n)
      XtAddEventHandler (windows [i].w, ExposureMask, False, expose_cb, mw);
      windows [i].window = XtWindow (windows [i].w);
      windows [i].pixmap = None;
-#ifdef HAVE_XFT
+#if defined USE_CAIRO || defined HAVE_XFT
      windows [i].xft_draw = 0;
 #endif
      set_window_type (windows [i].w, mw);
@@ -1411,7 +1418,7 @@ create_pixmap_for_menu (window_state* ws, XlwMenuWidget mw)
   ws->pixmap = XCreatePixmap (XtDisplay (ws->w), ws->window,
                               ws->width, ws->height,
                               DefaultDepthOfScreen (XtScreen (ws->w)));
-#ifdef HAVE_XFT
+#if defined USE_CAIRO || defined HAVE_XFT
   if (ws->xft_draw)
     XftDrawDestroy (ws->xft_draw);
   if (mw->menu.xft_font)
@@ -1831,7 +1838,7 @@ release_shadow_gcs (XlwMenuWidget mw)
   XtReleaseGC ((Widget) mw, mw->menu.shadow_bottom_gc);
 }
 
-#ifdef HAVE_XFT
+#if defined USE_CAIRO || defined HAVE_XFT
 static XftFont *
 getDefaultXftFont (XlwMenuWidget mw)
 {
@@ -1887,7 +1894,7 @@ XlwMenuInitialize (Widget request, Widget w, ArgList args, Cardinal *num_args)
                                    gray_width, gray_height,
                                    (unsigned long)1, (unsigned long)0, 1);
 
-#ifdef HAVE_XFT
+#if defined USE_CAIRO || defined HAVE_XFT
   if (openXftFont (mw))
     ;
   else
@@ -1933,7 +1940,7 @@ XlwMenuInitialize (Widget request, Widget w, ArgList args, Cardinal *num_args)
   mw->menu.windows [0].height = 0;
   mw->menu.windows [0].max_rest_width = 0;
   mw->menu.windows [0].pixmap = None;
-#ifdef HAVE_XFT
+#if defined USE_CAIRO || defined HAVE_XFT
   mw->menu.windows [0].xft_draw = 0;
 #endif
   size_menu (mw, 0);
@@ -1981,7 +1988,7 @@ XlwMenuRealize (Widget w, Mask *valueMask, XSetWindowAttributes *attributes)
   set_window_type (mw->menu.windows [0].w, mw);
   create_pixmap_for_menu (&mw->menu.windows [0], mw);
 
-#ifdef HAVE_XFT
+#if defined USE_CAIRO || defined HAVE_XFT
   if (mw->menu.xft_font)
     {
       XColor colors[3];
@@ -2078,7 +2085,7 @@ XlwMenuDestroy (Widget w)
   if (mw->menu.font)
     XFreeFont (XtDisplay (mw), mw->menu.font);
 
-#ifdef HAVE_XFT
+#if defined USE_CAIRO || defined HAVE_XFT
   if (mw->menu.windows [0].xft_draw)
     XftDrawDestroy (mw->menu.windows [0].xft_draw);
   if (mw->menu.xft_font)
@@ -2092,7 +2099,7 @@ XlwMenuDestroy (Widget w)
     {
       if (mw->menu.windows [i].pixmap != None)
         XFreePixmap (XtDisplay (mw), mw->menu.windows [i].pixmap);
-#ifdef HAVE_XFT
+#if defined USE_CAIRO || defined HAVE_XFT
       if (mw->menu.windows [i].xft_draw)
         XftDrawDestroy (mw->menu.windows [i].xft_draw);
 #endif
@@ -2102,7 +2109,7 @@ XlwMenuDestroy (Widget w)
     XtFree ((char *) mw->menu.windows);
 }
 
-#ifdef HAVE_XFT
+#if defined USE_CAIRO || defined HAVE_XFT
 static int
 fontname_changed (XlwMenuWidget newmw,
                   XlwMenuWidget oldmw)
@@ -2134,7 +2141,7 @@ XlwMenuSetValues (Widget current, Widget request, Widget new,
 
   if (newmw->core.background_pixel != oldmw->core.background_pixel
       || newmw->menu.foreground != oldmw->menu.foreground
-#ifdef HAVE_XFT
+#if defined USE_CAIRO || defined HAVE_XFT
       || fontname_changed (newmw, oldmw)
 #endif
 #ifdef HAVE_X_I18N
@@ -2170,7 +2177,7 @@ XlwMenuSetValues (Widget current, Widget request, Widget new,
           }
     }
 
-#ifdef HAVE_XFT
+#if defined USE_CAIRO || defined HAVE_XFT
   if (fontname_changed (newmw, oldmw))
     {
       int i;
diff --git a/lwlib/xlwmenuP.h b/lwlib/xlwmenuP.h
index 610f83afe45..2a05d993541 100644
--- a/lwlib/xlwmenuP.h
+++ b/lwlib/xlwmenuP.h
@@ -23,9 +23,13 @@ along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.  */
 
 #include "xlwmenu.h"
 #include <X11/CoreP.h>
-#ifdef HAVE_XFT
+#if defined USE_CAIRO || defined HAVE_XFT
+#ifdef USE_CAIRO
+#include "lwlib-utils.h"
+#else  /* HAVE_XFT */
 #include <X11/Xft/Xft.h>
 #endif
+#endif
 
 /* Elements in the stack arrays. */
 typedef struct _window_state
@@ -42,7 +46,7 @@ typedef struct _window_state
 
   /* Width of toggle buttons or radio buttons.  */
   Dimension     button_width;
-#ifdef HAVE_XFT
+#if defined USE_CAIRO || defined HAVE_XFT
   XftDraw*      xft_draw;
 #endif
 } window_state;
@@ -56,7 +60,7 @@ typedef struct _XlwMenu_part
   XFontSet      fontSet;
   XFontSetExtents *font_extents;
 #endif
-#ifdef HAVE_XFT
+#if defined USE_CAIRO || defined HAVE_XFT
   int           default_face;
   XftFont*      xft_font;
   XftColor      xft_fg, xft_bg, xft_disabled_fg;