upload sdk

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

contrib/sdk/sources/cairo/src/cairo-tristrip.c

@@ -0,0 +1,185 @@
+/* -*- Mode: c; tab-width: 8; c-basic-offset: 4; indent-tabs-mode: t; -*- */
+/*
+ * 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 Chris Wilson
+ *
+ * Contributor(s):
+ *	Chris Wilson <chris@chris-wilsonc.co.uk>
+ */
+
+#include "cairoint.h"
+
+#include "cairo-error-private.h"
+#include "cairo-tristrip-private.h"
+
+void
+_cairo_tristrip_init (cairo_tristrip_t *strip)
+{
+    VG (VALGRIND_MAKE_MEM_UNDEFINED (strip, sizeof (cairo_tristrip_t)));
+
+    strip->status = CAIRO_STATUS_SUCCESS;
+
+    strip->num_limits = 0;
+    strip->num_points = 0;
+
+    strip->size_points = ARRAY_LENGTH (strip->points_embedded);
+    strip->points = strip->points_embedded;
+}
+
+void
+_cairo_tristrip_fini (cairo_tristrip_t *strip)
+{
+    if (strip->points != strip->points_embedded)
+	free (strip->points);
+
+    VG (VALGRIND_MAKE_MEM_NOACCESS (strip, sizeof (cairo_tristrip_t)));
+}
+
+
+void
+_cairo_tristrip_limit (cairo_tristrip_t	*strip,
+		       const cairo_box_t	*limits,
+		       int			 num_limits)
+{
+    strip->limits = limits;
+    strip->num_limits = num_limits;
+}
+
+void
+_cairo_tristrip_init_with_clip (cairo_tristrip_t *strip,
+				const cairo_clip_t *clip)
+{
+    _cairo_tristrip_init (strip);
+    if (clip)
+	_cairo_tristrip_limit (strip, clip->boxes, clip->num_boxes);
+}
+
+/* make room for at least one more trap */
+static cairo_bool_t
+_cairo_tristrip_grow (cairo_tristrip_t *strip)
+{
+    cairo_point_t *points;
+    int new_size = 4 * strip->size_points;
+
+    if (CAIRO_INJECT_FAULT ()) {
+	strip->status = _cairo_error (CAIRO_STATUS_NO_MEMORY);
+	return FALSE;
+    }
+
+    if (strip->points == strip->points_embedded) {
+	points = _cairo_malloc_ab (new_size, sizeof (cairo_point_t));
+	if (points != NULL)
+	    memcpy (points, strip->points, sizeof (strip->points_embedded));
+    } else {
+	points = _cairo_realloc_ab (strip->points,
+	                               new_size, sizeof (cairo_trapezoid_t));
+    }
+
+    if (unlikely (points == NULL)) {
+	strip->status = _cairo_error (CAIRO_STATUS_NO_MEMORY);
+	return FALSE;
+    }
+
+    strip->points = points;
+    strip->size_points = new_size;
+    return TRUE;
+}
+
+void
+_cairo_tristrip_add_point (cairo_tristrip_t *strip,
+			   const cairo_point_t *p)
+{
+    if (unlikely (strip->num_points == strip->size_points)) {
+	if (unlikely (! _cairo_tristrip_grow (strip)))
+	    return;
+    }
+
+    strip->points[strip->num_points++] = *p;
+}
+
+/* Insert degenerate triangles to advance to the given point. The
+ * next point inserted must also be @p. */
+void
+_cairo_tristrip_move_to (cairo_tristrip_t *strip,
+			 const cairo_point_t *p)
+{
+    if (strip->num_points == 0)
+	return;
+
+    _cairo_tristrip_add_point (strip, &strip->points[strip->num_points-1]);
+    _cairo_tristrip_add_point (strip, p);
+#if 0
+    /* and one more for luck! (to preserve cw/ccw ordering) */
+    _cairo_tristrip_add_point (strip, p);
+#endif
+}
+
+void
+_cairo_tristrip_translate (cairo_tristrip_t *strip, int x, int y)
+{
+    cairo_fixed_t xoff, yoff;
+    cairo_point_t *p;
+    int i;
+
+    xoff = _cairo_fixed_from_int (x);
+    yoff = _cairo_fixed_from_int (y);
+
+    for (i = 0, p = strip->points; i < strip->num_points; i++, p++) {
+	p->x += xoff;
+	p->y += yoff;
+    }
+}
+
+void
+_cairo_tristrip_extents (const cairo_tristrip_t *strip,
+			 cairo_box_t *extents)
+{
+    int i;
+
+    if (strip->num_points == 0) {
+	extents->p1.x = extents->p1.y = 0;
+	extents->p2.x = extents->p2.y = 0;
+	return;
+    }
+
+    extents->p2 = extents->p1 = strip->points[0];
+    for (i = 1; i < strip->num_points; i++) {
+	const cairo_point_t *p =  &strip->points[i];
+
+	if (p->x < extents->p1.x)
+	    extents->p1.x = p->x;
+	else if (p->x > extents->p2.x)
+	    extents->p2.x = p->x;
+
+	if (p->y < extents->p1.y)
+	    extents->p1.y = p->y;
+	else if (p->y > extents->p2.y)
+	    extents->p2.y = p->y;
+    }
+}