Render block progression and line direction arrows, and a base gravity

2006-08-16  Behdad Esfahbod  <behdad@gnome.org>

        * examples/viewer-pangocairo.c (render_callback): Render block
        progression and line direction arrows, and a base gravity roof-top.

        * pango/pango-matrix.c (pango_matrix_to_gravity): New function.

        * pango/pango-utils.c (pango_gravity_to_rotation): New function.

        * pango/pangocairo-fcfont.c (_pango_cairo_fc_font_new): Use
        pango_gravity_to_rotation().

        * pango/pango-utils.h:
        * pango/pango-types.h:
        Reorder a bit.

        * examples/Makefile.am:
        * examples/test-chinese.txt: New test text for Chinese.

        * pango/check.defs: New script that checks that all the exported
        symbols are listed in the respective .def file. (only checks the
        libraries actually built.  No win32 for example.)

        * pango/Makefile.am: Hook check.defs as a 'make check' test.

        * pango/pango.def:
        * pango/pangoft2.def:
        * pango/pangocairo.def:
        Update.

        * docs/tmpl/glyphs.sgml:
        * docs/tmpl/main.sgml:
        * docs/pango-sections.txt:
        Update.

1 files changed, 28 insertions, 0 deletions

diff --git a/pango/pango-matrix.c b/pango/pango-matrix.c
index 58be83e1..322a4931 100644
--- a/pango/pango-matrix.c
+++ b/pango/pango-matrix.c
@@ -20,6 +20,7 @@
  */
 
 #include <config.h>
+#include <stdlib.h>
 #include <math.h>
 
 #include "pango-types.h"
@@ -248,3 +249,30 @@ pango_matrix_get_font_scale_factor (const PangoMatrix *matrix)
       return minor;
     }
 }
+
+/**
+ * pango_matrix_to_gravity:
+ * @matrix: a #PangoMatrix
+ *
+ * Finds the gravity that best matches the rotation component
+ * in a #PangoMatrix.
+ *
+ * Return value: the gravity of @matrix, which will never be
+ * %PANGO_GRAVITY_AUTO
+ *
+ * Since: 1.16
+ */
+PangoGravity
+pango_matrix_to_gravity (const PangoMatrix *matrix)
+{
+  PangoGravity gravity;
+  double x = matrix->xy;
+  double y = matrix->yy;
+
+  if (abs (x) > abs (y))
+    gravity = x < 0 ? PANGO_GRAVITY_WEST : PANGO_GRAVITY_EAST;
+  else
+    gravity = y < 0 ? PANGO_GRAVITY_NORTH : PANGO_GRAVITY_SOUTH;
+
+  return gravity;
+}