Introduce a new compositor architecture

Having spent the last dev cycle looking at how we could specialize the
compositors for various backends, we once again look for the
commonalities in order to reduce the duplication. In part this is
motivated by the idea that spans is a good interface for both the
existent GL backend and pixman, and so they deserve a dedicated
compositor. xcb/xlib target an identical rendering system and so they
should be using the same compositor, and it should be possible to run
that same compositor locally against pixman to generate reference tests.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

P.S. This brings massive upheaval (read breakage) I've tried delaying in
order to fix as many things as possible but now this one patch does far,
far, far too much. Apologies in advance for breaking your favourite
backend, but trust me in that the end result will be much better. :)

1 files changed, 85 insertions, 0 deletions

diff --git a/test/shape-sierpinski.c b/test/shape-sierpinski.c
new file mode 100644
index 000000000..9d2017067
--- /dev/null
+++ b/test/shape-sierpinski.c
@@ -0,0 +1,85 @@
+/*
+ * 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>
+ */
+
+/* I thought I spied a bug... */
+
+#include "cairo-test.h"
+
+#define WIDTH		(1024)
+#define HEIGHT		(600)
+
+static const double m_1_sqrt_3 = 0.577359269;
+
+static void
+T (cairo_t *cr, int size)
+{
+    cairo_move_to (cr, 0, 0);
+    cairo_line_to (cr, size, 0);
+    cairo_line_to (cr, size/2, size*m_1_sqrt_3);
+
+    size /= 2;
+    if (size >= 4) {
+	T (cr, size);
+	cairo_save (cr); {
+	    cairo_translate (cr, size, 0);
+	    T (cr, size);
+	} cairo_restore (cr);
+	cairo_save (cr); {
+	    cairo_translate (cr, size/2, size*m_1_sqrt_3);
+	    T (cr, size);
+	} cairo_restore (cr);
+    }
+}
+
+static cairo_test_status_t
+draw (cairo_t *cr, int width, int height)
+{
+    cairo_set_source_rgb (cr, 1, 1, 1);
+    cairo_paint (cr);
+
+    cairo_translate (cr, 0, 8);
+
+    cairo_set_source_rgb (cr, 0, 0, 0);
+    cairo_set_line_width (cr, 1.);
+
+    T (cr, WIDTH);
+
+    cairo_translate (cr, 0, 2*HEIGHT-16);
+    cairo_scale (cr, 1, -1);
+
+    T (cr, WIDTH);
+
+    cairo_stroke (cr);
+
+    return CAIRO_TEST_SUCCESS;
+}
+
+CAIRO_TEST (shape_sierpinski,
+	    "A fractal triangle",
+	    "stroke", /* keywords */
+	    NULL, /* requirements */
+	    WIDTH, 2*HEIGHT,
+	    NULL, draw)