upload sdk

git-svn-id: svn://kolibrios.org@4349 a494cfbc-eb01-0410-851d-a64ba20cac60

contrib/sdk/sources/cairo/src/cairo-clip-polygon.c

@@ -0,0 +1,156 @@
+/* -*- Mode: c; tab-width: 8; c-basic-offset: 4; indent-tabs-mode: t; -*- */
+/* cairo - a vector graphics library with display and print output
+ *
+ * Copyright © 2011 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., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, 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.uk>
+ */
+
+#include "cairoint.h"
+#include "cairo-clip-inline.h"
+#include "cairo-clip-private.h"
+#include "cairo-error-private.h"
+#include "cairo-freed-pool-private.h"
+#include "cairo-gstate-private.h"
+#include "cairo-path-fixed-private.h"
+#include "cairo-pattern-private.h"
+#include "cairo-composite-rectangles-private.h"
+#include "cairo-region-private.h"
+
+static cairo_bool_t
+can_convert_to_polygon (const cairo_clip_t *clip)
+{
+    cairo_clip_path_t *clip_path = clip->path;
+    cairo_antialias_t antialias = clip_path->antialias;
+
+    while ((clip_path = clip_path->prev) != NULL) {
+	if (clip_path->antialias != antialias)
+	    return FALSE;
+    }
+
+    return TRUE;
+}
+
+cairo_int_status_t
+_cairo_clip_get_polygon (const cairo_clip_t *clip,
+			 cairo_polygon_t *polygon,
+			 cairo_fill_rule_t *fill_rule,
+			 cairo_antialias_t *antialias)
+{
+    cairo_status_t status;
+    cairo_clip_path_t *clip_path;
+
+    if (_cairo_clip_is_all_clipped (clip)) {
+	_cairo_polygon_init (polygon, NULL, 0);
+	return CAIRO_INT_STATUS_SUCCESS;
+    }
+
+    /* If there is no clip, we need an infinite polygon */
+    assert (clip && (clip->path || clip->num_boxes));
+
+    if (clip->path == NULL) {
+	*fill_rule = CAIRO_FILL_RULE_WINDING;
+	*antialias = CAIRO_ANTIALIAS_DEFAULT;
+	return _cairo_polygon_init_box_array (polygon,
+					      clip->boxes,
+					      clip->num_boxes);
+    }
+
+    /* check that residual is all of the same type/tolerance */
+    if (! can_convert_to_polygon (clip))
+	return CAIRO_INT_STATUS_UNSUPPORTED;
+
+    if (clip->num_boxes < 2)
+	_cairo_polygon_init_with_clip (polygon, clip);
+    else
+	_cairo_polygon_init_with_clip (polygon, NULL);
+
+    clip_path = clip->path;
+    *fill_rule = clip_path->fill_rule;
+    *antialias = clip_path->antialias;
+
+    status = _cairo_path_fixed_fill_to_polygon (&clip_path->path,
+						clip_path->tolerance,
+						polygon);
+    if (unlikely (status))
+	goto err;
+
+    if (clip->num_boxes > 1) {
+	status = _cairo_polygon_intersect_with_boxes (polygon, fill_rule,
+						      clip->boxes, clip->num_boxes);
+	if (unlikely (status))
+	    goto err;
+    }
+
+    polygon->limits = NULL;
+    polygon->num_limits = 0;
+
+    while ((clip_path = clip_path->prev) != NULL) {
+	cairo_polygon_t next;
+
+	_cairo_polygon_init (&next, NULL, 0);
+	status = _cairo_path_fixed_fill_to_polygon (&clip_path->path,
+						    clip_path->tolerance,
+						    &next);
+	if (likely (status == CAIRO_STATUS_SUCCESS))
+		status = _cairo_polygon_intersect (polygon, *fill_rule,
+						   &next, clip_path->fill_rule);
+	_cairo_polygon_fini (&next);
+	if (unlikely (status))
+	    goto err;
+
+	*fill_rule = CAIRO_FILL_RULE_WINDING;
+    }
+
+    return CAIRO_STATUS_SUCCESS;
+
+err:
+    _cairo_polygon_fini (polygon);
+    return status;
+}
+
+cairo_bool_t
+_cairo_clip_is_polygon (const cairo_clip_t *clip)
+{
+    if (_cairo_clip_is_all_clipped (clip))
+	return TRUE;
+
+    /* If there is no clip, we need an infinite polygon */
+    if (clip == NULL)
+	return FALSE;
+
+    if (clip->path == NULL)
+	return TRUE;
+
+    /* check that residual is all of the same type/tolerance */
+    return can_convert_to_polygon (clip);
+}