Alter definition of cairo_composite_rectangles_t

This is a more useful definition that is able to individually track the
rectangles that compose the composite operation. This will be used by
the specialist compositors as a means to perform the common extents
determination for an operation.

1 files changed, 105 insertions, 0 deletions

diff --git a/src/cairo-composite-rectangles-private.h b/src/cairo-composite-rectangles-private.h
new file mode 100644
index 000000000..be1a16a29
--- /dev/null
+++ b/src/cairo-composite-rectangles-private.h
@@ -0,0 +1,105 @@
+/* cairo - a vector graphics library with display and print output
+ *
+ * Copyright © 2009 Intel Corporation
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it either under the terms of the GNU Lesser General Public
+ * License version 2.1 as published by the Free Software Foundation
+ * (the "LGPL") or, at your option, under the terms of the Mozilla
+ * Public License Version 1.1 (the "MPL"). If you do not alter this
+ * notice, a recipient may use your version of this file under either
+ * the MPL or the LGPL.
+ *
+ * You should have received a copy of the LGPL along with this library
+ * in the file COPYING-LGPL-2.1; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ * You should have received a copy of the MPL along with this library
+ * in the file COPYING-MPL-1.1
+ *
+ * The contents of this file are subject to the Mozilla Public License
+ * Version 1.1 (the "License"); you may not use this file except in
+ * compliance with the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
+ * OF ANY KIND, either express or implied. See the LGPL or the MPL for
+ * the specific language governing rights and limitations.
+ *
+ * The Original Code is the cairo graphics library.
+ *
+ * The Initial Developer of the Original Code is University of Southern
+ * California.
+ *
+ * Contributor(s):
+ *	Chris Wilson <chris@chris-wilson.co.u>
+ */
+
+#ifndef CAIRO_COMPOSITE_RECTANGLES_PRIVATE_H
+#define CAIRO_COMPOSITE_RECTANGLES_PRIVATE_H
+
+#include "cairo-types-private.h"
+
+CAIRO_BEGIN_DECLS
+
+/* Rectangles that take part in a composite operation.
+ *
+ * The source and mask track the extents of the respective patterns in device
+ * space. The unbounded rectangle is essentially the clip rectangle. And the
+ * intersection of all is the bounded rectangle, which is the minimum extents
+ * the operation may require. Whether or not the operation is actually bounded
+ * is tracked in the is_bounded boolean.
+ *
+ */
+struct _cairo_composite_rectangles {
+    cairo_rectangle_int_t source;
+    cairo_rectangle_int_t mask;
+    cairo_rectangle_int_t bounded; /* dst */
+    cairo_rectangle_int_t unbounded; /* clip */
+    uint32_t is_bounded;
+};
+
+cairo_private cairo_int_status_t
+_cairo_composite_rectangles_init_for_paint (cairo_composite_rectangles_t *extents,
+					 int surface_width, int surface_height,
+					 cairo_operator_t	 op,
+					 const cairo_pattern_t	*source,
+					 cairo_clip_t		*clip);
+
+cairo_private cairo_int_status_t
+_cairo_composite_rectangles_init_for_mask (cairo_composite_rectangles_t *extents,
+					int surface_width, int surface_height,
+					cairo_operator_t	 op,
+					const cairo_pattern_t	*source,
+					const cairo_pattern_t	*mask,
+					cairo_clip_t		*clip);
+
+cairo_private cairo_int_status_t
+_cairo_composite_rectangles_init_for_stroke (cairo_composite_rectangles_t *extents,
+					     int surface_width, int surface_height,
+					     cairo_operator_t	 op,
+					     const cairo_pattern_t	*source,
+					     cairo_path_fixed_t	*path,
+					     const cairo_stroke_style_t	*style,
+					     const cairo_matrix_t	*ctm,
+					     cairo_clip_t		*clip);
+
+cairo_private cairo_int_status_t
+_cairo_composite_rectangles_init_for_fill (cairo_composite_rectangles_t *extents,
+					   int surface_width, int surface_height,
+					   cairo_operator_t	 op,
+					   const cairo_pattern_t	*source,
+					   cairo_path_fixed_t	*path,
+					   cairo_clip_t		*clip);
+
+cairo_private cairo_int_status_t
+_cairo_composite_rectangles_init_for_glyphs (cairo_composite_rectangles_t *extents,
+					     int surface_width, int surface_height,
+					     cairo_operator_t		 op,
+					     const cairo_pattern_t	*source,
+					     cairo_scaled_font_t	*scaled_font,
+					     cairo_glyph_t		*glyphs,
+					     int			 num_glyphs,
+					     cairo_clip_t		*clip,
+					     cairo_bool_t		*overlap);
+
+#endif /* CAIRO_COMPOSITE_RECTANGLES_PRIVATE_H */