WebSVN – Kolibri OS – Diff – /programs/develop/libraries/cairo/src/cairo-surface-clipper.c

 /* 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
  */
 #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,
+.,
+					   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 *clip_path)
+						      cairo_clip_path_t *end)
+{
     cairo_status_t status;
-    if (clip_path->prev != NULL) {
+    if (clip_path->prev != end) {
 	status =
 	    _cairo_surface_clipper_intersect_clip_path_recursive (clipper,
+								  clip_path->prev,
-								  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,
-				 cairo_clip_t *clip)
+				 const cairo_clip_t *clip)
+{
     cairo_status_t status;
-    cairo_bool_t clear;
+    cairo_bool_t incremental = FALSE;
-    /* XXX as we cache a reference to the path, and compare every time,
-     * we may in future need to install a notification if the clip->path
-     * is every modified (e.g. cairo_clip_translate).
-     */
-    if (clip == NULL && clipper->clip.path == NULL)
+    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));
-	return CAIRO_STATUS_SUCCESS;
+    /* XXX Is this an incremental clip? */
+    if (clipper->clip && clip &&
+	clip->num_boxes == clipper->clip->num_boxes &&
-    if (clip != NULL && clipper->clip.path != NULL &&
+	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;
-	_cairo_clip_equal (clip, &clipper->clip))
+	if (clip_path) {
+	    incremental = TRUE;
+	    status = _cairo_surface_clipper_intersect_clip_path_recursive (clipper,
+									   clip->path,
 									   clipper->clip->path);
-	return CAIRO_STATUS_SUCCESS;
+	}
     }
-    /* all clipped out state should never propagate this far */
-    assert (clip == NULL || clip->path != NULL);
-    /* Check whether this clip is a continuation of the previous.
-     * If not, we have to remove the current clip and rebuild.
+    _cairo_clip_destroy (clipper->clip);
-     */
-    clear = clip == NULL || clip->path->prev != clipper->clip.path;
-    _cairo_clip_reset (&clipper->clip);
+    clipper->clip = _cairo_clip_copy (clip);
     _cairo_clip_init_copy (&clipper->clip, clip);
     if (incremental)
-    if (clear) {
+	return status;
 	clipper->is_clipped = FALSE;
-	status = clipper->intersect_clip_path (clipper, NULL, 0, 0, 0);
+    status = clipper->intersect_clip_path (clipper, NULL, 0, 0, 0);
-	if (unlikely (status))
+    if (unlikely (status))
-	    return status;
+	return status;
-	if (clip != NULL && clip->path != NULL) {
+    if (clip == NULL)
+	return CAIRO_STATUS_SUCCESS;
-	    status =
-		_cairo_surface_clipper_intersect_clip_path_recursive (clipper,
-								      clip->path);
+    status = _cairo_surface_clipper_intersect_clip_boxes (clipper, clip);
-	    clipper->is_clipped = TRUE;
-	}
+    if (unlikely (status))
-    } else {
-	cairo_clip_path_t *path = clip->path;
+	return status;
-	clipper->is_clipped = TRUE;
+    if (clip->path != NULL) {
-	status = clipper->intersect_clip_path (clipper,
-					       &path->path,
-					       path->fill_rule,
+	    status = _cairo_surface_clipper_intersect_clip_path_recursive (clipper,
-					       path->tolerance,
+									   clip->path,
-					       path->antialias);
+									   NULL);
+    }
     return status;
+}
 void
 _cairo_surface_clipper_init (cairo_surface_clipper_t *clipper,
 			     cairo_surface_clipper_intersect_clip_path_func_t func)
+{
-    _cairo_clip_init (&clipper->clip);
-    clipper->is_clipped = FALSE;
+    clipper->clip = NULL;
     clipper->intersect_clip_path = func;
+}
 void
 _cairo_surface_clipper_reset (cairo_surface_clipper_t *clipper)
+{
-    _cairo_clip_reset (&clipper->clip);
+    _cairo_clip_destroy (clipper->clip);
-    clipper->is_clipped = FALSE;
+    clipper->clip = NULL;
+}

Subversion Repositories Kolibri OS

(root)/programs/develop/libraries/cairo/src/cairo-surface-clipper.c – Rev 1892 → 3959