Add checks for Cairo

Sat Jan  8 16:46:37 2005  Owen Taylor  <otaylor@redhat.com>

        * configure.in: Add checks for Cairo

        * pango/Makefile.am: Add libpangocairo.

        * pango/pangocairo-font.c pango/pangocairo-fontmap.c
        pango/pangocairo.h pango/pangocairo-private.h
        pango/pangocairo-fcfont.c pango/pangocairo-fcfontmap.c
        pango/pangocairo-fc.h: Start of a Cairo/FreeType backend.

        * pango/pangofc-fontmap.[ch]: Add a "get_render_key"
        virtual function to allow subclasses to specialize the
        details of how caching works. Add a default implementation
        that's a little more sophisticated than what was there
        before.

        * pango/pangoft2-private.h pangofc-font.c pangoft2.c:
        Move default implementations of has_char(), get_glyph()
        to the base class.

        * pango/pangofc-private.h pango/pangoft2-private.h:
        Move PANGO_UNITS_26_6 and friends to pango/pangofc-private.h.

        * examples/renderdemo.[ch] examples/pangoft2topgm.c
        examples/xftview.c: Allow passing in a custom function
        to transform drawing.

        * examples/Makefile.am examples/cairoview.c: Add a
        Cairo/Xlib example program.

        * examples/cairosimple.c: Simple Cairo example with
        output to a PNG.

        * pango/pango-layout.c (pango_layout_line_get_extents): Fix
        bug where line ink rect was always including 0, 0.

1 files changed, 88 insertions, 0 deletions

diff --git a/examples/cairosimple.c b/examples/cairosimple.c
new file mode 100644
index 00000000..1ec7edf2
--- /dev/null
+++ b/examples/cairosimple.c
@@ -0,0 +1,88 @@
+#include <math.h>
+#include <pango/pangocairo.h>
+
+static void
+draw_text (cairo_t *cr)
+{
+#define RADIUS 150
+#define N_WORDS 10
+#define FONT "Sans Bold 27"
+
+  PangoLayout *layout;
+  PangoFontDescription *desc;
+  int i;
+
+  /* Center coordinates on the middle of the region we are drawing
+   */
+  cairo_translate (cr, RADIUS, RADIUS);
+
+  /* Create a PangoLayout, set the font and text */
+  layout = pango_cairo_create_layout (cr);
+  
+  pango_layout_set_text (layout, "Text", -1);
+  desc = pango_font_description_from_string (FONT);
+  pango_layout_set_font_description (layout, desc);
+  pango_font_description_free (desc);
+
+  /* Draw the layout N_WORDS times in a circle */
+  for (i = 0; i < N_WORDS; i++)
+    {
+      int width, height;
+      double angle = (360. * i) / N_WORDS;
+      double red;
+
+      cairo_save (cr);
+
+      /* Gradient from red at angle == 60 to blue at angle == 300 */
+      red   = (1 + cos ((angle - 60) * G_PI / 180.)) / 2;
+      cairo_set_rgb_color (cr, red, 0, 1.0 - red);
+
+      cairo_rotate (cr, angle * G_PI / 180.);
+    
+      /* Inform Pango to re-layout the text with the new transformation */
+      pango_cairo_update_layout (cr, layout);
+    
+      pango_layout_get_size (layout, &width, &height);
+      cairo_move_to (cr, - ((double)width / PANGO_SCALE) / 2, - RADIUS);
+      pango_cairo_show_layout (cr, layout);
+
+      cairo_restore (cr);
+    }
+
+  /* free the layout object */
+  g_object_unref (layout);
+}
+
+int main (int argc, char **argv)
+{
+  cairo_t *cr;
+  FILE *f;
+
+  if (argc != 2)
+    {
+      g_printerr ("Usage: cairosimple OUTPUT_FILENAME\n");
+      return 1;
+    }
+
+  f = fopen (argv[1], "w");
+  if (!f)
+    {
+      g_printerr ("Usage: cannot open '%s'\n", argv[1]);
+      return 1;
+    }
+
+  cr = cairo_create();
+  cairo_set_target_png (cr, f,
+			 CAIRO_FORMAT_ARGB32,
+			 2 * RADIUS, 2 * RADIUS);
+
+  cairo_set_rgb_color (cr, 1.0, 1.0, 1.0);
+  cairo_rectangle (cr, 0, 0, 2 * RADIUS, 2 * RADIUS);
+  cairo_fill (cr);
+  draw_text (cr);
+  
+  cairo_destroy (cr);
+  fclose (f);
+
+  return 0;
+}