Driver for X-based viewer. Used by pangocairo-view and pangoxft-view

2006-02-01  Behdad Esfahbod  <behdad@gnome.org>

        * examples/viewer-x.c, examples/viewer-x.h: Driver for X-based
        viewer.  Used by pangocairo-view and pangoxft-view currently.

        * examples/Makefile.am, examples/cairoview.c, examples/xftview.c,
        examples/pangoft2topgm.c, examples/renderdemo.h,
        examples/renderdemo.c: Adjust to the above change.

1 files changed, 169 insertions, 0 deletions

diff --git a/examples/viewer-x.c b/examples/viewer-x.c
new file mode 100644
index 00000000..6546612b
--- /dev/null
+++ b/examples/viewer-x.c
@@ -0,0 +1,169 @@
+/* viewer-x.c: Common code X-based rendering demos
+ *
+ * Copyright (C) 1999,2004,2005 Red Hat, Inc.
+ * Copyright (C) 2001 Sun Microsystems
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#include <errno.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "viewer-x.h"
+#include "renderdemo.h"
+
+/* initialized by main() */
+static Display *display;
+static int screen;
+static Window window;
+static Pixmap pixmap;
+
+/* initialized by do_init() */
+static PangoContext *context;
+static int width, height;
+
+/* runtime stuff */
+static Region update_region = NULL;
+static gboolean show_borders;
+
+static void
+update (void)
+{
+  GC gc;
+  XRectangle extents;
+  int width, height;
+
+  XClipBox (update_region, &extents);
+
+  width = extents.width;
+  height = extents.height;
+
+  gc = XCreateGC (display, pixmap, 0, NULL);
+
+  XCopyArea (display, pixmap, window, gc,
+	     extents.x, extents.y,
+	     extents.width, extents.height,
+	     extents.x, extents.y);
+
+  XFreeGC (display, gc);
+	     
+  XDestroyRegion (update_region);
+  update_region = NULL;
+}
+
+static void
+expose (XExposeEvent *xev)
+{
+  XRectangle  r;
+
+  if (!update_region)
+    update_region = XCreateRegion ();
+
+  r.x = xev->x;
+  r.y = xev->y;
+  r.width = xev->width;
+  r.height = xev->height;
+
+  XUnionRectWithRegion (&r, update_region, update_region);
+}
+
+int
+main (int argc, char **argv)
+{
+  XEvent xev;
+  unsigned long bg;
+  XSizeHints size_hints;
+  unsigned int quit_keycode;
+  unsigned int borders_keycode;
+  
+  g_type_init();
+
+  parse_options (argc, argv);
+
+  display = XOpenDisplay (NULL);
+  if (!display)
+    fail ("Cannot open display %s\n", XDisplayName (NULL));
+  screen = DefaultScreen (display);
+
+  do_init (display, screen, &context, &width, &height);
+
+  bg = WhitePixel (display, screen);
+  window = XCreateSimpleWindow (display, DefaultRootWindow (display),
+				0, 0, width, height, 0,
+				bg, bg);
+  pixmap = XCreatePixmap (display, window, width, height,
+			  DefaultDepth (display, screen));
+  XSelectInput (display, window, ExposureMask | KeyPressMask);
+  
+  XMapWindow (display, window);
+  XmbSetWMProperties (display, window,
+		      get_options_string (),
+		      NULL, NULL, 0, NULL, NULL, NULL);
+  
+  memset ((char *)&size_hints, 0, sizeof (XSizeHints));
+  size_hints.flags = PSize | PMaxSize;
+  size_hints.width = width; size_hints.height = height; /* for compat only */
+  size_hints.max_width = width; size_hints.max_height = height;
+  
+  XSetWMNormalHints (display, window, &size_hints);
+
+  borders_keycode = XKeysymToKeycode(display, 'B');
+  quit_keycode = XKeysymToKeycode(display, 'Q');
+
+  do_render (display, screen, window, pixmap, context, width, height, show_borders);
+
+  while (1)
+    {
+      if (!XPending (display) && update_region)
+	update ();
+	
+      XNextEvent (display, &xev);
+      switch (xev.xany.type) {
+      case KeyPress:
+	if (xev.xkey.keycode == quit_keycode)
+	  goto done;
+	else if (xev.xkey.keycode == borders_keycode)
+	  {
+	    XRectangle  r;
+	    show_borders = !show_borders;
+	    do_render (display, screen, window, pixmap, context, width, height, show_borders);
+
+	    if (!update_region)
+	      update_region = XCreateRegion ();
+
+	    r.x = 0;
+	    r.y = 0;
+	    r.width = width;
+	    r.height = height;
+	    XUnionRectWithRegion (&r, update_region, update_region);
+	  }
+	break;
+      case Expose:
+	expose (&xev.xexpose);
+	break;
+      }
+    }
+
+done:
+
+  g_object_unref (context);
+  XFreePixmap (display, pixmap);
+  finalize ();
+
+  return 0;
+}