upload sdk

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

contrib/sdk/sources/cairo/src/cairo-surface-clipper.c

@@ -0,0 +1,196 @@
+/* cairo - a vector graphics library with display and print output
+ *
+ * Copyright © 2009 Chris Wilson
+ *
+ * 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 Red Hat, Inc.
+ *
+ * Contributor(s):
+ *      Chris Wilson <chris@chris-wilson.co.uk>
+ */
+
+#include "cairoint.h"
+
+#include "cairo-clip-inline.h"
+#include "cairo-surface-clipper-private.h"
+
+/* A collection of routines to facilitate vector surface clipping */
+
+/* XXX Eliminate repeated paths and nested clips */
+
+static cairo_status_t
+_cairo_path_fixed_add_box (cairo_path_fixed_t *path,
+			   const cairo_box_t *box)
+{
+    cairo_status_t status;
+
+    status = _cairo_path_fixed_move_to (path, box->p1.x, box->p1.y);
+    if (unlikely (status))
+	return status;
+
+    status = _cairo_path_fixed_line_to (path, box->p2.x, box->p1.y);
+    if (unlikely (status))
+	return status;
+
+    status = _cairo_path_fixed_line_to (path, box->p2.x, box->p2.y);
+    if (unlikely (status))
+	return status;
+
+    status = _cairo_path_fixed_line_to (path, box->p1.x, box->p2.y);
+    if (unlikely (status))
+	return status;
+
+    return _cairo_path_fixed_close_path (path);
+}
+
+static cairo_status_t
+_cairo_surface_clipper_intersect_clip_boxes (cairo_surface_clipper_t *clipper,
+					     const cairo_clip_t *clip)
+{
+    cairo_path_fixed_t path;
+    cairo_status_t status;
+    int i;
+
+    if (clip->num_boxes == 0)
+	return CAIRO_STATUS_SUCCESS;
+
+    /* Reconstruct the path for the clip boxes.
+     * XXX maybe a new clipper callback?
+     */
+
+    _cairo_path_fixed_init (&path);
+    for (i = 0; i < clip->num_boxes; i++) {
+	status = _cairo_path_fixed_add_box (&path, &clip->boxes[i]);
+	if (unlikely (status)) {
+	    _cairo_path_fixed_fini (&path);
+	    return status;
+	}
+    }
+
+    status = clipper->intersect_clip_path (clipper, &path,
+					   CAIRO_FILL_RULE_WINDING,
+					   0.,
+					   CAIRO_ANTIALIAS_DEFAULT);
+    _cairo_path_fixed_fini (&path);
+
+    return status;
+}
+
+static cairo_status_t
+_cairo_surface_clipper_intersect_clip_path_recursive (cairo_surface_clipper_t *clipper,
+						      cairo_clip_path_t *clip_path,
+						      cairo_clip_path_t *end)
+{
+    cairo_status_t status;
+
+    if (clip_path->prev != end) {
+	status =
+	    _cairo_surface_clipper_intersect_clip_path_recursive (clipper,
+								  clip_path->prev,
+								  end);
+	if (unlikely (status))
+	    return status;
+    }
+
+    return clipper->intersect_clip_path (clipper,
+					 &clip_path->path,
+					 clip_path->fill_rule,
+					 clip_path->tolerance,
+					 clip_path->antialias);
+}
+
+cairo_status_t
+_cairo_surface_clipper_set_clip (cairo_surface_clipper_t *clipper,
+				 const cairo_clip_t *clip)
+{
+    cairo_status_t status;
+    cairo_bool_t incremental = FALSE;
+
+    if (_cairo_clip_equal (clip, clipper->clip))
+	return CAIRO_STATUS_SUCCESS;
+
+    /* all clipped out state should never propagate this far */
+    assert (!_cairo_clip_is_all_clipped (clip));
+
+    /* XXX Is this an incremental clip? */
+    if (clipper->clip && clip &&
+	clip->num_boxes == clipper->clip->num_boxes &&
+	memcmp (clip->boxes, clipper->clip->boxes,
+		sizeof (cairo_box_t) * clip->num_boxes) == 0)
+    {
+	cairo_clip_path_t *clip_path = clip->path;
+	while (clip_path != NULL && clip_path != clipper->clip->path)
+	    clip_path = clip_path->prev;
+
+	if (clip_path) {
+	    incremental = TRUE;
+	    status = _cairo_surface_clipper_intersect_clip_path_recursive (clipper,
+									   clip->path,
+									   clipper->clip->path);
+	}
+    }
+
+    _cairo_clip_destroy (clipper->clip);
+    clipper->clip = _cairo_clip_copy (clip);
+
+    if (incremental)
+	return status;
+
+    status = clipper->intersect_clip_path (clipper, NULL, 0, 0, 0);
+    if (unlikely (status))
+	return status;
+
+    if (clip == NULL)
+	return CAIRO_STATUS_SUCCESS;
+
+    status = _cairo_surface_clipper_intersect_clip_boxes (clipper, clip);
+    if (unlikely (status))
+	return status;
+
+    if (clip->path != NULL) {
+	    status = _cairo_surface_clipper_intersect_clip_path_recursive (clipper,
+									   clip->path,
+									   NULL);
+    }
+
+    return status;
+}
+
+void
+_cairo_surface_clipper_init (cairo_surface_clipper_t *clipper,
+			     cairo_surface_clipper_intersect_clip_path_func_t func)
+{
+    clipper->clip = NULL;
+    clipper->intersect_clip_path = func;
+}
+
+void
+_cairo_surface_clipper_reset (cairo_surface_clipper_t *clipper)
+{
+    _cairo_clip_destroy (clipper->clip);
+    clipper->clip = NULL;
+}