[test] Check set_operator()

Draw a pair of rectangles with each operator in turn - seems to trigger an
issue with the PDF/PS backends.

test/.gitignore

@@ -128,6 +128,8 @@ multi-page.pdf
 multi-page.ps
 new-sub-path
 nil-surface
+operator
+operator-alpha
 operator-clear
 operator-source
 over-above-source

test/Makefile.am

@@ -101,6 +101,8 @@ miter-precision$(EXEEXT)				\
 move-to-show-surface$(EXEEXT)				\
 new-sub-path$(EXEEXT)					\
 nil-surface$(EXEEXT)					\
+operator$(EXEEXT)					\
+operator-alpha$(EXEEXT)					\
 operator-clear$(EXEEXT)					\
 operator-source$(EXEEXT)				\
 over-above-source$(EXEEXT)				\
@@ -539,6 +541,10 @@ REFERENCE_IMAGES = \
 	new-sub-path-rgb24-ref.png	\
 	nil-surface-ref.png	\
 	nil-surface-rgb24-ref.png	\
+	operator-ref.png	\
+	operator-rgb24-ref.png	\
+	operator-alpha-ref.png	\
+	operator-alpha-rgb24-ref.png	\
 	operator-clear-quartz-ref.png	\
 	operator-clear-quartz-rgb24-ref.png	\
 	operator-clear-ref.png	\

test/operator-alpha.c

@@ -0,0 +1,74 @@
+/*
+ * Copyright © 2008 Chris Wilson
+ *
+ * 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
+ * Chris Wilson not be used in advertising or publicity pertaining to
+ * distribution of the software without specific, written prior
+ * permission. Chris Wilson makes no representations about the
+ * suitability of this software for any purpose.  It is provided "as
+ * is" without express or implied warranty.
+ *
+ * CHRIS WILSON DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
+ * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS, IN NO EVENT SHALL CHRIS WILSON 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: Chris Wilson <chris@chris-wilson.co.uk>
+ */
+
+#include "cairo-test.h"
+
+#define N_OPERATORS (CAIRO_OPERATOR_SATURATE + 1)
+#define SIZE 10
+#define PAD 3
+
+static cairo_test_draw_function_t draw;
+
+static const cairo_test_t test = {
+    "operator-alpha",
+    "Tests using set_operator() with an non-opaque source",
+    (SIZE+PAD) * N_OPERATORS + PAD, SIZE + 2*PAD,
+    draw
+};
+
+static cairo_test_status_t
+draw (cairo_t *cr, int width, int height)
+{
+    unsigned int n;
+
+    cairo_translate (cr, PAD, PAD);
+
+    for (n = 0; n < N_OPERATORS; n++) {
+	cairo_reset_clip (cr);
+	cairo_rectangle (cr, 0, 0, SIZE, SIZE);
+	cairo_clip (cr);
+
+	cairo_set_source_rgb (cr, 1, 0, 0);
+	cairo_set_operator (cr, CAIRO_OPERATOR_OVER);
+	cairo_rectangle (cr, 0, 0, SIZE-PAD, SIZE-PAD);
+	cairo_fill (cr);
+
+	cairo_set_source_rgba (cr, 0, 0, 1, .33);
+	cairo_set_operator (cr, n);
+	cairo_rectangle (cr, PAD, PAD, SIZE-PAD, SIZE-PAD);
+	cairo_fill (cr);
+
+	cairo_translate (cr, SIZE+PAD, 0);
+    }
+
+    return CAIRO_TEST_SUCCESS;
+}
+
+int
+main (void)
+{
+    return cairo_test (&test);
+}
+

test/operator.c

@@ -0,0 +1,74 @@
+/*
+ * Copyright © 2008 Chris Wilson
+ *
+ * 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
+ * Chris Wilson not be used in advertising or publicity pertaining to
+ * distribution of the software without specific, written prior
+ * permission. Chris Wilson makes no representations about the
+ * suitability of this software for any purpose.  It is provided "as
+ * is" without express or implied warranty.
+ *
+ * CHRIS WILSON DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
+ * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS, IN NO EVENT SHALL CHRIS WILSON 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: Chris Wilson <chris@chris-wilson.co.uk>
+ */
+
+#include "cairo-test.h"
+
+#define N_OPERATORS (CAIRO_OPERATOR_SATURATE + 1)
+#define SIZE 10
+#define PAD 3
+
+static cairo_test_draw_function_t draw;
+
+static const cairo_test_t test = {
+    "operator",
+    "Tests using set_operator()",
+    (SIZE+PAD) * N_OPERATORS + PAD, SIZE + 2*PAD,
+    draw
+};
+
+static cairo_test_status_t
+draw (cairo_t *cr, int width, int height)
+{
+    unsigned int n;
+
+    cairo_translate (cr, PAD, PAD);
+
+    for (n = 0; n < N_OPERATORS; n++) {
+	cairo_reset_clip (cr);
+	cairo_rectangle (cr, 0, 0, SIZE, SIZE);
+	cairo_clip (cr);
+
+	cairo_set_source_rgb (cr, 1, 0, 0);
+	cairo_set_operator (cr, CAIRO_OPERATOR_OVER);
+	cairo_rectangle (cr, 0, 0, SIZE-PAD, SIZE-PAD);
+	cairo_fill (cr);
+
+	cairo_set_source_rgb (cr, 0, 0, 1);
+	cairo_set_operator (cr, n);
+	cairo_rectangle (cr, PAD, PAD, SIZE-PAD, SIZE-PAD);
+	cairo_fill (cr);
+
+	cairo_translate (cr, SIZE+PAD, 0);
+    }
+
+    return CAIRO_TEST_SUCCESS;
+}
+
+int
+main (void)
+{
+    return cairo_test (&test);
+}
+