New test: dash-scale

Tests interactions of cairo_set_dash and cairo_scale, (in particular with a
non-uniformly scaled pen).

test/.gitignore

@@ -19,6 +19,7 @@ coverage
 create-from-png
 create-from-png-stream
 dash-caps-joins
+dash-scale
 dash-offset-negative
 dash-zero-length
 extend-reflect

test/Makefile.am

@@ -16,6 +16,7 @@ composite-integer-translate-over-repeat \
 create-from-png			\
 create-from-png-stream		\
 dash-caps-joins			\
+dash-scale			\
 dash-offset-negative		\
 dash-zero-length		\
 extend-reflect			\
@@ -151,6 +152,7 @@ create-from-png-ref.png					\
 create-from-png-stream-ref.png				\
 dash-caps-joins-ref.png					\
 dash-caps-joins-ps-argb32-ref.png			\
+dash-scale-ref.png					\
 dash-offset-negative-ref.png				\
 dash-offset-negative-ps-argb32-ref.png			\
 dash-zero-length-ref.png				\

test/dash-scale.c

@@ -0,0 +1,125 @@
+/*
+ * Copyright © 2005 Red Hat, Inc.
+ *
+ * Permission to use, copy, modify, distribute, and sell this software
+ * and its documentation for any purpose is hereby granted without
+ * fee, provided that the above copyright notice appear in all copies
+ * and that both that copyright notice and this permission notice
+ * appear in supporting documentation, and that the name of
+ * Red Hat, Inc. not be used in advertising or publicity pertaining to
+ * distribution of the software without specific, written prior
+ * permission. Red Hat, Inc. makes no representations about the
+ * suitability of this software for any purpose.  It is provided "as
+ * is" without express or implied warranty.
+ *
+ * RED HAT, INC. DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
+ * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS, IN NO EVENT SHALL RED HAT, INC. BE LIABLE FOR ANY SPECIAL,
+ * INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
+ * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
+ * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
+ * IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ * Author: Carl D. Worth <cworth@cworth.org>
+ */
+
+#include "cairo-test.h"
+
+#define LINE_WIDTH 	8.
+#define SIZE 		(5 * LINE_WIDTH)
+#define PAD		(2 * LINE_WIDTH)
+
+cairo_test_t test = {
+    "dash-scale",
+    "Test interactions of cairo_set_dash and cairo_scale, (in particular with a non-uniformly scaled pen)",
+    3 * (PAD + SIZE) + PAD,
+    PAD + 5 * SIZE + 2 * (2 * PAD) + PAD
+};
+
+static void
+make_path (cairo_t *cr)
+{
+    cairo_move_to (cr, 0., 0.);
+    cairo_rel_line_to (cr, 0., SIZE);
+    cairo_rel_line_to (cr, SIZE, 0.);
+    cairo_close_path (cr);
+
+    cairo_move_to (cr, 2 * LINE_WIDTH, 0.);
+    cairo_rel_line_to (cr, 3 * LINE_WIDTH, 0.);
+    cairo_rel_line_to (cr, 0., 3 * LINE_WIDTH);
+}
+
+static void
+draw_three_shapes (cairo_t *cr)
+{
+    cairo_save (cr);
+
+    make_path (cr);
+    cairo_set_line_cap (cr, CAIRO_LINE_CAP_BUTT);
+    cairo_set_line_join (cr, CAIRO_LINE_JOIN_BEVEL);
+    cairo_stroke (cr);
+
+    cairo_translate (cr, SIZE + PAD, 0.);
+
+    make_path (cr);
+    cairo_set_line_cap (cr, CAIRO_LINE_CAP_ROUND);
+    cairo_set_line_join (cr, CAIRO_LINE_JOIN_ROUND);
+    cairo_stroke (cr);
+
+    cairo_translate (cr, SIZE + PAD, 0.);
+
+    make_path (cr);
+    cairo_set_line_cap (cr, CAIRO_LINE_CAP_SQUARE);
+    cairo_set_line_join (cr, CAIRO_LINE_JOIN_MITER);
+    cairo_stroke (cr);
+
+    cairo_restore (cr);
+}
+
+static cairo_test_status_t
+draw (cairo_t *cr, int width, int height)
+{
+    double dash[] = {1.5 * LINE_WIDTH};
+
+    /* We draw in the default black, so paint white first. */
+    cairo_save (cr);
+    cairo_set_source_rgb (cr, 1.0, 1.0, 1.0); /* white */
+    cairo_paint (cr);
+    cairo_restore (cr);
+
+    cairo_translate (cr, PAD, PAD);
+
+    cairo_set_dash (cr, dash, sizeof(dash)/sizeof(dash[0]), - 2 * LINE_WIDTH);
+    cairo_set_line_width (cr, LINE_WIDTH);
+    draw_three_shapes (cr);
+
+    cairo_translate (cr, 0, SIZE + 2 * PAD);
+
+    cairo_save (cr);
+    {
+	cairo_set_dash (cr, dash, sizeof(dash)/sizeof(dash[0]), - 2 * LINE_WIDTH);
+	cairo_set_line_width (cr, LINE_WIDTH);
+	cairo_scale (cr, 1, 2);
+	draw_three_shapes (cr);
+    }
+    cairo_restore (cr);
+
+    cairo_translate (cr, 0, 2 * (SIZE + PAD));
+
+    cairo_save (cr);
+    {
+	cairo_scale (cr, 1, 2);
+	cairo_set_dash (cr, dash, sizeof(dash)/sizeof(dash[0]), - 2 * LINE_WIDTH);
+	cairo_set_line_width (cr, LINE_WIDTH);
+	draw_three_shapes (cr);
+    }
+    cairo_restore (cr);
+
+    return CAIRO_TEST_SUCCESS;
+}
+
+int
+main (void)
+{
+    return cairo_test (&test, draw);
+}