[util] Add font-view

A C variant of Behdad's python example font viewer.

util/Makefile.am

@@ -24,6 +24,11 @@ backtrace_symbols_la_LIBADD  = -lbfd -liberty
 
 #malloc_stats_la_LIBADD  = $(backtrace_symbols_la_LIBADD) backtrace-symbols.lo
 
+noinst_PROGRAMS = font-view
+
+font_view_CFLAGS = $(gtk_CFLAGS)
+font_view_LDADD = ../src/libcairo.la $(gtk_LIBS)
+
 EXTRA_DIST += \
 	COPYING \
 	xr2cairo \

util/font-view.c

@@ -0,0 +1,184 @@
+/*
+ * Copyright © 2008 Behdad Esfahbod
+ * Copyright © 2009 Chris Wilson
+ *
+ * Permission to use, copy, modify, distribute, and sell this software
+ * and its documentation for any purpose is hereby granted without
+ * fee, provided that the above copyright notice appear in all copies
+ * and that both that copyright notice and this permission notice
+ * appear in supporting documentation, and that the name of
+ * Chris Wilson not be used in advertising or publicity pertaining to
+ * distribution of the software without specific, written prior
+ * permission. Chris Wilson makes no representations about the
+ * suitability of this software for any purpose.  It is provided "as
+ * is" without express or implied warranty.
+ *
+ * CHRIS WILSON DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
+ * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS, IN NO EVENT SHALL CHRIS WILSON BE LIABLE FOR ANY SPECIAL,
+ * INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
+ * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
+ * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
+ * IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ * Author: Chris Wilson <chris@chris-wilson.co.uk>
+ */
+
+#include <gtk/gtk.h>
+#include <cairo.h>
+
+struct options {
+    const char *text;
+    const char *family;
+    cairo_font_weight_t weight;
+    cairo_font_slant_t slant;
+    double size;
+    int PAD;
+    const char *png;
+};
+
+static void
+draw (cairo_t *cr, struct options *options)
+{
+    cairo_text_extents_t extents;
+    cairo_font_extents_t font_extents;
+
+    cairo_select_font_face (cr,
+			    options->family, options->slant, options->weight);
+    cairo_set_font_size (cr, options->size);
+
+    cairo_text_extents (cr, options->text, &extents);
+    cairo_translate (cr,
+		     options->PAD - extents.x_bearing,
+		     options->PAD - extents.y_bearing);
+
+    cairo_font_extents (cr, &font_extents);
+    cairo_rectangle (cr, 0, -font_extents.ascent,
+		      extents.x_advance, font_extents.height);
+    cairo_move_to (cr, -options->PAD, 0);
+    cairo_line_to (cr, extents.width + options->PAD, 0);
+    cairo_set_source_rgba (cr, 1, 0, 0, .7);
+    cairo_stroke (cr);
+
+    cairo_rectangle (cr,
+		     extents.x_bearing, extents.y_bearing,
+		     extents.width, extents.height);
+    cairo_set_source_rgba (cr, 0, 1, 0, .7);
+    cairo_stroke (cr);
+
+    cairo_move_to (cr, 0, 0);
+    cairo_set_source_rgb (cr, 0, 0, 1);
+    cairo_show_text (cr, options->text);
+    cairo_fill (cr);
+}
+
+static gboolean
+expose_event (GtkWidget *w, GdkEventExpose *ev, struct options *options)
+{
+    cairo_t *cr;
+
+    cr = gdk_cairo_create (w->window);
+
+    cairo_set_source_rgb (cr, 1, 1, 1);
+    cairo_paint (cr);
+
+    draw (cr, options);
+
+    cairo_destroy (cr);
+
+    if (options->png) {
+	cairo_surface_t *image;
+
+	image = cairo_image_surface_create (CAIRO_FORMAT_RGB24,
+		                            w->allocation.width,
+					    w->allocation.height);
+	cr = cairo_create (image);
+	cairo_set_source_rgb (cr, 1, 1, 1);
+	cairo_paint (cr);
+
+	draw (cr, options);
+
+	cairo_destroy (cr);
+	cairo_surface_write_to_png (image, options->png);
+	cairo_surface_destroy (image);
+    }
+
+    return TRUE;
+}
+
+static void
+size_request (GtkWidget *w, GtkRequisition *req , struct options *options)
+{
+    cairo_surface_t *dummy;
+    cairo_t *cr;
+    cairo_text_extents_t extents;
+
+    dummy = cairo_image_surface_create (CAIRO_FORMAT_RGB24, 0, 0);
+    cr = cairo_create (dummy);
+    cairo_surface_destroy (dummy);
+
+    cairo_select_font_face (cr,
+			    options->family, options->slant, options->weight);
+    cairo_set_font_size (cr, options->size);
+
+    cairo_text_extents (cr, options->text, &extents);
+    cairo_destroy (cr);
+
+    req->width = extents.width + 2 * options->PAD;
+    req->height = extents.height + 2 * options->PAD;
+}
+
+int
+main (int argc, char **argv)
+{
+    GtkWidget *window;
+    struct options options = {
+	"The Quick Brown Fox Jumps Over The Lazy Dog!",
+	"@cairo:small-caps",
+	CAIRO_FONT_WEIGHT_NORMAL,
+	CAIRO_FONT_SLANT_NORMAL,
+	48,
+	30,
+	"font-view.png"
+    };
+
+    gtk_init (&argc, &argv);
+
+    /* rudimentary argument processing */
+    if (argc >= 2) {
+	options.family = argv[1];
+    }
+    if (argc >= 3) {
+	if (strcmp (argv[2], "italic") == 0)
+	    options.slant = CAIRO_FONT_SLANT_ITALIC;
+	else if (strcmp (argv[2], "oblique") == 0)
+	    options.slant = CAIRO_FONT_SLANT_OBLIQUE;
+	else
+	    options.slant = atoi (argv[2]);
+    }
+    if (argc >= 4) {
+	if (strcmp (argv[3], "bold") == 0)
+	    options.weight = CAIRO_FONT_WEIGHT_BOLD;
+	else
+	    options.weight = atoi (argv[3]);
+    }
+    if (argc >= 5) {
+	options.size = atof (argv[4]);
+    }
+    if (argc >= 6) {
+	options.text = argv[5];
+    }
+
+    window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
+    g_signal_connect (window, "size-request",
+		      G_CALLBACK (size_request), &options);
+    g_signal_connect (window, "expose-event",
+		      G_CALLBACK (expose_event), &options);
+    g_signal_connect (window, "delete-event",
+		      G_CALLBACK (gtk_main_quit), NULL);
+
+    gtk_window_present (GTK_WINDOW (window));
+    gtk_main ();
+
+    return 0;
+}