Add new rectilinear-stroke test

This is in preparation for an optimized implementation of cairo_stroke
for rectilinear paths.

test/.gitignore

@@ -104,6 +104,7 @@ svg-surface.svg
 pixman-rotate
 pthread-show-text
 rectangle-rounding-error
+rectilinear-stroke
 rel-path
 scale-source-surface-paint
 select-font-face

test/Makefile.am

@@ -71,6 +71,7 @@ pattern-getters			\
 pixman-rotate			\
 random-intersections		\
 rectangle-rounding-error	\
+rectilinear-stroke		\
 scale-source-surface-paint	\
 select-font-face		\
 select-font-no-show-text	\
@@ -286,6 +287,7 @@ random-intersections-ref.png				\
 random-intersections-rgb24-ref.png			\
 random-intersections-ps-argb32-ref.png			\
 rectangle-rounding-error-ref.png			\
+rectilinear-stroke-ref.png				\
 rel-path-ref.png					\
 rel-path-rgb24-ref.png					\
 romedalen.png						\

test/rectilinear-stroke.c

@@ -0,0 +1,138 @@
+/*
+ * Copyright © 2006 Red Hat, Inc.
+ *
+ * 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: Carl D. Worth <cworth@cworth.org>
+ */
+
+#include "cairo-test.h"
+
+#define SIZE 25
+
+static cairo_test_draw_function_t draw;
+
+cairo_test_t test = {
+    "rectilinear-stroke",
+    "Test rectilinear stroke operations (covering only whole pixels)",
+    SIZE, SIZE,
+    draw
+};
+
+static cairo_test_status_t
+draw (cairo_t *cr, int width, int height)
+{
+    /* Paint background white, then draw in black. */
+    cairo_set_source_rgb (cr, 1.0, 1.0, 1.0); /* white */
+    cairo_paint (cr);
+    cairo_set_source_rgb (cr, 0.0, 0.0, 0.0); /* black */
+
+    cairo_set_line_width (cr, 1.0);
+    cairo_translate (cr, 1, 1);
+
+    /* Draw everything first with square caps. */
+    cairo_set_line_cap (cr, CAIRO_LINE_CAP_SQUARE);
+
+    /* Draw horizontal and vertical segments, each in both
+     * directions. */
+    cairo_move_to     (cr,  4.5,  0.5);
+    cairo_rel_line_to (cr,  2.0,  0.0);
+
+    cairo_move_to     (cr, 10.5,  4.5);
+    cairo_rel_line_to (cr,  0.0,  2.0);
+
+    cairo_move_to     (cr,  6.5, 10.5);
+    cairo_rel_line_to (cr, -2.0,  0.0);
+
+    cairo_move_to     (cr,  0.5,  6.5);
+    cairo_rel_line_to (cr,  0.0, -2.0);
+
+    /* Draw right angle turns in four directions. */
+    cairo_move_to     (cr,  0.5,  2.5);
+    cairo_rel_line_to (cr,  0.0, -2.0);
+    cairo_rel_line_to (cr,  2.0,  0.0);
+
+    cairo_move_to     (cr,  8.5,  0.5);
+    cairo_rel_line_to (cr,  2.0,  0.0);
+    cairo_rel_line_to (cr,  0.0,  2.0);
+
+    cairo_move_to     (cr, 10.5,  8.5);
+    cairo_rel_line_to (cr,  0.0,  2.0);
+    cairo_rel_line_to (cr, -2.0,  0.0);
+
+    cairo_move_to     (cr,  2.5, 10.5);
+    cairo_rel_line_to (cr, -2.0,  0.0);
+    cairo_rel_line_to (cr,  0.0, -2.0);
+
+    /* Draw a closed-path rectangle */
+    cairo_rectangle   (cr, 0.5, 12.5, 10.0, 10.0);
+
+    cairo_stroke (cr);
+
+    cairo_translate (cr, 12, 0);
+
+    /* Now draw the same results, but with butt caps. */
+    cairo_set_line_cap (cr, CAIRO_LINE_CAP_BUTT);
+
+    /* Draw horizontal and vertical segments, each in both
+     * directions. */
+    cairo_move_to     (cr,  4.0,  0.5);
+    cairo_rel_line_to (cr,  3.0,  0.0);
+
+    cairo_move_to     (cr, 10.5,  4.0);
+    cairo_rel_line_to (cr,  0.0,  3.0);
+
+    cairo_move_to     (cr,  7.0, 10.5);
+    cairo_rel_line_to (cr, -3.0,  0.0);
+
+    cairo_move_to     (cr,  0.5,  7.0);
+    cairo_rel_line_to (cr,  0.0, -3.0);
+
+    /* Draw right angle turns in four directions. */
+    cairo_move_to     (cr,  0.5,  3.0);
+    cairo_rel_line_to (cr,  0.0, -2.5);
+    cairo_rel_line_to (cr,  2.5,  0.0);
+
+    cairo_move_to     (cr,  8.0,  0.5);
+    cairo_rel_line_to (cr,  2.5,  0.0);
+    cairo_rel_line_to (cr,  0.0,  2.5);
+
+    cairo_move_to     (cr, 10.5,  8.0);
+    cairo_rel_line_to (cr,  0.0,  2.5);
+    cairo_rel_line_to (cr, -2.5,  0.0);
+
+    cairo_move_to     (cr,  3.0, 10.5);
+    cairo_rel_line_to (cr, -2.5,  0.0);
+    cairo_rel_line_to (cr,  0.0, -2.5);
+
+    /* Draw a closed-path rectangle */
+    cairo_rectangle   (cr, 0.5, 12.5, 10.0, 10.0);
+
+    cairo_stroke (cr);
+
+    return CAIRO_TEST_SUCCESS;
+}
+
+int
+main (void)
+{
+    return cairo_test (&test);
+}