Add PangoMatrix type for affine transforms.

Fri May 28 11:39:39 2004  Owen Taylor  <otaylor@redhat.com>

        * pango/pango-types.h pango/pango-utils.c: Add PangoMatrix
        type for affine transforms.

        * configure.in pango.pc.in pango/Makefile.am: Add a -lm
        dependency for PangoMatrix operations.

        * pango/pango-context.[ch]: Add pango_context_set/get_matrix().

        * pango/pangoft2-render.c pango/pangoft2-private.h: Add
        code for drawing antialiased transformed rectangles and
        squiggly error underlines.

        * pango/pangoft2.[ch]: Add pango_ft2_render_transformed(),
        pango_ft2_render_layout_subpixel(),
        pango_ft2_render_layout_line_subpixel(), implement transformed
        rendering.

        * pango/pangofc-font.c: Pass any transformation matrix on to
        fontconfig when creating the pattern for a PangoFcFont.

1 files changed, 49 insertions, 0 deletions

diff --git a/pango/pango-context.c b/pango/pango-context.c
index 316245dd..9ebde1e1 100644
--- a/pango/pango-context.c
+++ b/pango/pango-context.c
@@ -37,6 +37,8 @@ struct _PangoContext
   PangoDirection base_dir;
   PangoFontDescription *font_desc;
 
+  PangoMatrix *matrix;
+
   PangoFontMap *font_map;
 };
 
@@ -117,6 +119,8 @@ pango_context_finalize (GObject *object)
     g_object_unref (context->font_map);
 
   pango_font_description_free (context->font_desc);
+  if (context->matrix)
+    pango_matrix_free (context->matrix);
   
   G_OBJECT_CLASS (parent_class)->finalize (object);
 }
@@ -152,6 +156,51 @@ pango_context_new (void)
 }
 
 /**
+ * pango_context_set_matrix:
+ * @context: a #PangoContext
+ * @matrix: a #PangoMatrix, or %NULL to unset any existing matrix.
+ *  (No matrix set is the same as setting the identity matrix.)
+ * 
+ * Sets the transformation matrix that will be applied when rendering
+ * with this context. Note that reported metrics are in the user space
+ * coordinates before the application of the matrix, not device-space
+ * coordiantes after the application of the matrix. So, they don't scale
+ * with the matrix, though they may change slightly for different
+ * matrices, depending on how the text is fit to the pixel grid.
+ **/
+void
+pango_context_set_matrix (PangoContext *context,
+			  PangoMatrix  *matrix)
+{
+  g_return_if_fail (PANGO_IS_CONTEXT (context));
+
+  if (context->matrix)
+    pango_matrix_free (context->matrix);
+  if (matrix)
+    context->matrix = pango_matrix_copy (matrix);
+}
+
+/**
+ * pango_context_get_matrix:
+ * @context: a #PangoContext
+ *
+ * Gets the transformation matrix that will be applied when
+ * rendering with this context. See pango_context_set_matrix().
+ *
+ * Returns: the matrix, or %NULL if no matrix has been set
+ *  (which is the same as the identity matrix). The returned
+ *  matrix is owned by Pango and must not be modified or
+ *  freed.
+ **/
+PangoMatrix *
+pango_context_get_matrix (PangoContext *context)
+{
+  g_return_val_if_fail (PANGO_IS_CONTEXT (context), NULL);
+
+  return context->matrix;
+}
+
+/**
  * pango_context_set_font_map:
  * @context: a #PangoContext
  * @font_map: the #PangoFontMap to set.