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+/* -*- Mode: c; c-basic-offset: 4; indent-tabs-mode: t; tab-width: 8; -*- */
+/*
+ * Copyright 2010 Andrea Canciani
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use, copy,
+ * modify, merge, publish, distribute, sublicense, and/or sell copies
+ * of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ * Author: Andrea Canciani <ranma42@gmail.com>
+ */
+
+#include "cairo-test.h"
+
+#define SIZE 52
+#define OFFSET 5
+#define DISTANCE 10.25
+
+/*
+ This test checks that boxes not aligned to pixels are drawn
+ correctly.
+
+ In particular the corners of the boxes are drawn incorrectly by
+ cairo-image in cairo 1.10.0, because overlapping boxes are passed to
+ a span converter which assumes disjoint boxes as input.
+
+ This results in corners to be drawn with the wrong shade.
+*/
+
+static cairo_test_status_t
+draw (cairo_t *cr, int width, int height)
+{
+ int i;
+
+ cairo_set_source_rgb (cr, 1, 1, 1);
+ cairo_paint (cr);
+
+ cairo_set_operator (cr, CAIRO_OPERATOR_OVER);
+ cairo_set_source_rgb (cr, 0, 0, 0);
+ cairo_set_line_width (cr, 4);
+ cairo_translate (cr, 2*OFFSET, 2*OFFSET);
+
+ for (i = 0; i < 4; i++) {
+ double x = i * DISTANCE;
+
+ cairo_move_to (cr, x, -OFFSET-0.75);
+ cairo_line_to (cr, x, SIZE-3*OFFSET-0.25);
+
+ cairo_move_to (cr, -OFFSET-0.75, x);
+ cairo_line_to (cr, SIZE-3*OFFSET-0.25, x);
+ }
+
+ cairo_stroke (cr);
+
+ return CAIRO_TEST_SUCCESS;
+}
+
+static cairo_test_status_t
+aligned (cairo_t *cr, int width, int height)
+{
+ cairo_set_antialias (cr, CAIRO_ANTIALIAS_NONE);
+ return draw (cr, width, height);
+}
+
+CAIRO_TEST (rectilinear_grid,
+ "Test rectilinear rasterizer (covering partial pixels)",
+ "rectilinear", /* keywords */
+ NULL, /* requirements */
+ SIZE, SIZE,
+ NULL, draw)
+
+CAIRO_TEST (a1_rectilinear_grid,
+ "Test rectilinear rasterizer (covering whole pixels)",
+ "rectilinear", /* keywords */
+ "target=raster", /* requirements */
+ SIZE, SIZE,
+ NULL, aligned)