add cairo

1 files changed, 135 insertions, 0 deletions

diff --git a/libs/cairo-1.16.0/test/drunkard-tails.c b/libs/cairo-1.16.0/test/drunkard-tails.c
new file mode 100644
index 0000000..f55c7be
--- /dev/null
+++ b/libs/cairo-1.16.0/test/drunkard-tails.c
@@ -0,0 +1,135 @@
+/*
+ * Copyright © 2011 Intel Corporation
+ *
+ * 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: Chris Wilson <chris@chris-wilson.co.uk>
+ */
+
+#include "cairo-test.h"
+
+#define LINE_WIDTH	10.
+#define SIZE		(5 * LINE_WIDTH)
+#define PAD		(3 * LINE_WIDTH)
+
+static uint32_t state;
+
+static double
+uniform_random (double minval, double maxval)
+{
+    static uint32_t const poly = 0x9a795537U;
+    uint32_t n = 32;
+    while (n-->0)
+	state = 2*state < state ? (2*state ^ poly) : 2*state;
+    return minval + state * (maxval - minval) / 4294967296.0;
+}
+
+static void
+make_path (cairo_t *cr)
+{
+    int i;
+
+    state = 0xdeadbeef;
+
+    cairo_move_to (cr, SIZE/2, SIZE/2);
+    for (i = 0; i < 200; i++) {
+	double theta = uniform_random (-M_PI, M_PI);
+	cairo_rel_line_to (cr,
+			   cos (theta) * LINE_WIDTH / 4,
+			   sin (theta) * LINE_WIDTH / 4);
+    }
+}
+
+static void
+draw_caps_joins (cairo_t *cr)
+{
+    cairo_save (cr);
+
+    cairo_translate (cr, PAD, PAD);
+
+    cairo_reset_clip (cr);
+    cairo_rectangle (cr, 0, 0, SIZE, SIZE);
+    cairo_clip (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.);
+
+    cairo_reset_clip (cr);
+    cairo_rectangle (cr, 0, 0, SIZE, SIZE);
+    cairo_clip (cr);
+
+    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.);
+
+    cairo_reset_clip (cr);
+    cairo_rectangle (cr, 0, 0, SIZE, SIZE);
+    cairo_clip (cr);
+
+    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)
+{
+    /* 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_set_line_width (cr, LINE_WIDTH);
+
+    draw_caps_joins (cr);
+
+    cairo_save (cr);
+    /* and reflect to generate the opposite vertex ordering */
+    cairo_translate (cr, 0, height);
+    cairo_scale (cr, 1, -1);
+
+    draw_caps_joins (cr);
+    cairo_restore (cr);
+
+    cairo_translate (cr, 0, SIZE + PAD);
+
+    return CAIRO_TEST_SUCCESS;
+}
+
+CAIRO_TEST (drunkard_tails,
+	    "Test caps and joins on short tail segments",
+	    "stroke, cap, join", /* keywords */
+	    NULL, /* requirements */
+	    3 * (PAD + SIZE) + PAD,
+	    2 * (PAD + SIZE) + PAD,
+	    NULL, draw)
+