[test/dash-curve] Add a new test case for dashes along splines.

Modify the dash-state test case and use curves instead of lines -
exercises _cairo_stroker_curve_to_dashed() and degenerate splines.

test/.gitignore

@@ -32,6 +32,7 @@ create-for-stream.svg
 create-from-png
 create-from-png-stream
 dash-caps-joins
+dash-curve
 dash-no-dash
 dash-offset-negative
 dash-scale

test/Makefile.am

@@ -25,6 +25,7 @@ create-for-stream$(EXEEXT)				\
 create-from-png$(EXEEXT)				\
 create-from-png-stream$(EXEEXT)				\
 dash-caps-joins$(EXEEXT)				\
+dash-curve$(EXEEXT)					\
 dash-no-dash$(EXEEXT)					\
 dash-offset-negative$(EXEEXT)				\
 dash-scale$(EXEEXT)					\
@@ -265,6 +266,7 @@ REFERENCE_IMAGES = \
 	dash-caps-joins-ps-rgb24-ref.png	\
 	dash-caps-joins-quartz-ref.png	\
 	dash-caps-joins-ref.png	\
+	dash-curve-ref.png	\
 	dash-no-dash-ref.png	\
 	dash-offset-negative-ref.png	\
 	dash-scale-ps-argb32-ref.png	\

test/dash-curve.c

@@ -0,0 +1,74 @@
+/*
+ * Copyright © 2007 Jeff Smith
+ *
+ * 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
+ * Jeff Smith not be used in advertising or publicity pertaining to
+ * distribution of the software without specific, written prior
+ * permission. Jeff Smith makes no representations about the
+ * suitability of this software for any purpose.  It is provided "as
+ * is" without express or implied warranty.
+ *
+ * JEFF SMITH DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
+ * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS, IN NO EVENT SHALL JEFF SMITH 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: Jeff Smith <whydoubt@yahoo.com>
+ */
+
+#include "cairo-test.h"
+
+static cairo_test_draw_function_t draw;
+
+cairo_test_t test = {
+    "dash-curve",
+    "Tries to explore the state space of the dashing code along curves",
+    25*60, 4*60,
+    draw
+};
+
+static cairo_test_status_t
+draw (cairo_t *cr, int width, int height)
+{
+    double dashes[2] = {20, 20};
+    int a=0, b=0, c=0;
+
+    cairo_set_source_rgb (cr, 0, 0, 0);
+    cairo_paint (cr);
+
+    for (a=0; a<4; a++)
+    for (b=0; b<5; b++)
+    for (c=0; c<5; c++) {
+	cairo_move_to (cr, ((b*5)+c)*60+10, a*60+10);
+	cairo_rel_curve_to (cr,
+		            0,	    b*10,
+			    0,	    b*10,
+			    c*10,   b*10);
+
+	cairo_set_source_rgb (cr, 1, 1, 1);
+	cairo_set_line_width (cr, 8);
+	cairo_set_line_cap (cr, CAIRO_LINE_CAP_ROUND);
+	cairo_set_dash (cr, dashes, 2, a*10);
+	cairo_stroke_preserve (cr);
+
+	cairo_set_source_rgb (cr, 0, 0.5, 1);
+	cairo_set_line_width (cr, 2);
+	cairo_set_line_cap (cr, CAIRO_LINE_CAP_BUTT);
+	cairo_set_dash (cr, 0, 0, 0);
+	cairo_stroke (cr);
+    }
+    return CAIRO_TEST_SUCCESS;
+}
+
+int
+main (void)
+{
+    return cairo_test (&test);
+}