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+/* -*- Mode: c; c-basic-offset: 4; indent-tabs-mode: t; tab-width: 8; -*- */
+/* cairo - a vector graphics library with display and print output
+ *
+ * Copyright 2002 University of Southern California
+ * Copyright 2005 Red Hat, Inc.
+ * Copyright 2007 Emmanuel Pacaud
+ * Copyright 2008 Benjamin Otte
+ * Copyright 2008 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 University of Southern
+ * California.
+ *
+ * Contributor(s):
+ * Owen Taylor <otaylor@redhat.com>
+ * Kristian Høgsberg <krh@redhat.com>
+ * Emmanuel Pacaud <emmanuel.pacaud@lapp.in2p3.fr>
+ * Chris Wilson <chris@chris-wilson.co.uk>
+ * Andrea Canciani <ranma42@gmail.com>
+ */
+
+#include "cairo-test.h"
+
+#define STEPS 16
+#define START_OPERATOR CAIRO_OPERATOR_CLEAR
+#define STOP_OPERATOR CAIRO_OPERATOR_HSL_LUMINOSITY
+
+#define SIZE 3
+#define COUNT 6
+#define FULL_WIDTH ((STEPS + 1) * COUNT - 1)
+#define FULL_HEIGHT ((COUNT + STOP_OPERATOR - START_OPERATOR) / COUNT) * (STEPS + 1)
+
+static void
+create_patterns (cairo_t *bg, cairo_t *fg)
+{
+ int x;
+
+ for (x = 0; x < STEPS; x++) {
+ double i = (double) x / (STEPS - 1);
+ cairo_set_source_rgba (bg, 0, 0, 0, i);
+ cairo_rectangle (bg, x, 0, 1, STEPS);
+ cairo_fill (bg);
+
+ cairo_set_source_rgba (fg, 0, 0, 0, i);
+ cairo_rectangle (fg, 0, x, STEPS, 1);
+ cairo_fill (fg);
+ }
+}
+
+/* expects a STEP*STEP pixel rectangle */
+static void
+do_composite (cairo_t *cr, cairo_operator_t op, cairo_surface_t *bg, cairo_surface_t *fg)
+{
+ cairo_set_operator (cr, CAIRO_OPERATOR_SOURCE);
+ cairo_set_source_surface (cr, bg, 0, 0);
+ cairo_paint (cr);
+
+ cairo_set_operator (cr, op);
+ cairo_set_source_surface (cr, fg, 0, 0);
+ cairo_paint (cr);
+}
+
+static void
+subdraw (cairo_t *cr, int width, int height)
+{
+ size_t i = 0;
+ cairo_operator_t op;
+ cairo_t *bgcr, *fgcr;
+ cairo_surface_t *bg, *fg;
+
+ bg = cairo_surface_create_similar (cairo_get_target (cr),
+ CAIRO_CONTENT_ALPHA, SIZE * STEPS, SIZE * STEPS);
+ fg = cairo_surface_create_similar (cairo_get_target (cr),
+ CAIRO_CONTENT_ALPHA, SIZE * STEPS, SIZE * STEPS);
+ bgcr = cairo_create (bg);
+ fgcr = cairo_create (fg);
+ cairo_scale (bgcr, SIZE, SIZE);
+ cairo_scale (fgcr, SIZE, SIZE);
+ create_patterns (bgcr, fgcr);
+ cairo_destroy (bgcr);
+ cairo_destroy (fgcr);
+
+ for (op = START_OPERATOR; op <= STOP_OPERATOR; op++, i++) {
+ cairo_save (cr);
+ cairo_translate (cr,
+ SIZE * (STEPS + 1) * (i % COUNT),
+ SIZE * (STEPS + 1) * (i / COUNT));
+ cairo_rectangle (cr, 0, 0, SIZE * (STEPS + 1), SIZE * (STEPS+1));
+ cairo_clip (cr);
+ do_composite (cr, op, bg, fg);
+ cairo_restore (cr);
+ }
+
+ cairo_surface_destroy (fg);
+ cairo_surface_destroy (bg);
+}
+
+
+static cairo_surface_t *
+create_source (cairo_surface_t *target, int width, int height)
+{
+ cairo_surface_t *similar;
+ cairo_t *cr;
+
+ similar = cairo_surface_create_similar (target,
+ CAIRO_CONTENT_ALPHA,
+ width, height);
+ cr = cairo_create (similar);
+ cairo_surface_destroy (similar);
+
+ subdraw (cr, width, height);
+
+ similar = cairo_surface_reference (cairo_get_target (cr));
+ cairo_destroy (cr);
+
+ return similar;
+}
+
+static cairo_test_status_t
+draw (cairo_t *cr, int width, int height)
+{
+ cairo_surface_t *source;
+
+ cairo_set_source_rgb (cr, 1, 1, 1);
+ cairo_paint (cr);
+
+ source = create_source (cairo_get_target (cr), width, height);
+ cairo_set_source_surface (cr, source, 0, 0);
+ cairo_surface_destroy (source);
+
+ cairo_paint (cr);
+
+ return CAIRO_TEST_SUCCESS;
+}
+
+CAIRO_TEST (operator_alpha_alpha,
+ "Tests result of compositing pure-alpha surfaces"
+ "\nCompositing of pure-alpha sources is inconsistent across backends.",
+ "alpha, similar, operator", /* keywords */
+ NULL, /* requirements */
+ FULL_WIDTH * SIZE, FULL_HEIGHT * SIZE,
+ NULL, draw)