[test] Add surface-pattern-operator

Test the results of compositing ALPHA and COLOR_ALPHA surfaces
with different operators.

test/Makefile.am

@@ -922,6 +922,10 @@ REFERENCE_IMAGES = \
 	stroke-image.xlib.ref.png \
 	surface-pattern-big-scale-down.ref.png \
 	surface-pattern-big-scale-down.ps.xfail.png \
+	surface-pattern-operator.argb32.ref.png \
+	surface-pattern-operator.rgb24.ref.png \
+	surface-pattern-operator.xlib.argb32.ref.png \
+	surface-pattern-operator.xlib.rgb24.ref.png \
 	surface-pattern-scale-down.pdf.ref.png \
 	surface-pattern-scale-down.ps2.ref.png \
 	surface-pattern-scale-down.ps3.ref.png \

test/Makefile.sources

@@ -205,6 +205,7 @@ test_sources = \
 	surface-finish-twice.c				\
 	surface-pattern.c				\
 	surface-pattern-big-scale-down.c		\
+	surface-pattern-operator.c			\
 	surface-pattern-scale-down.c			\
 	surface-pattern-scale-up.c			\
 	text-antialias-gray.c				\

test/surface-pattern-operator.c

@@ -0,0 +1,117 @@
+/*
+ * Copyright 2009 Andrea Canciani
+ *
+ * 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
+ * Andrea Canciani not be used in advertising or publicity pertaining to
+ * distribution of the software without specific, written prior
+ * permission. Andrea Canciani makes no representations about the
+ * suitability of this software for any purpose.  It is provided "as
+ * is" without express or implied warranty.
+ *
+ * ANDREA CANCIANI DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
+ * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS, IN NO EVENT SHALL ANDREA CANCIANI 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: Andrea Canciani <ranma42@gmail.com>
+ */
+
+#include "cairo-test.h"
+
+#define N_OPERATORS (CAIRO_OPERATOR_SATURATE + 1)
+#define HEIGHT 16
+#define WIDTH 16
+#define PAD 3
+
+static cairo_pattern_t*
+_create_pattern (cairo_surface_t *target, cairo_content_t content, int width, int height)
+{
+    cairo_pattern_t *pattern;
+    cairo_surface_t *surface;
+    cairo_t *cr;
+
+    surface = cairo_surface_create_similar (target, content, width, height);
+    cr = cairo_create (surface);
+    cairo_surface_destroy (surface);
+
+    cairo_set_source_rgb (cr, 1, 0, 0);
+    cairo_arc (cr, 0.5 * width, 0.5 * height, 0.45 * height, -M_PI / 4, 3 * M_PI / 4);
+    cairo_fill (cr);
+
+    pattern = cairo_pattern_create_for_surface (cairo_get_target (cr));
+    cairo_destroy (cr);
+
+    return pattern;
+}
+
+static cairo_test_status_t
+draw (cairo_t *cr, int width, int height)
+{
+    cairo_pattern_t *alpha_pattern, *color_alpha_pattern, *pattern;
+    unsigned int n, i;
+
+    alpha_pattern = _create_pattern (cairo_get_target (cr),
+				     CAIRO_CONTENT_ALPHA,
+				     0.9 * WIDTH, 0.9 * HEIGHT);
+    color_alpha_pattern = _create_pattern (cairo_get_target (cr),
+					   CAIRO_CONTENT_COLOR_ALPHA,
+					   0.9 * WIDTH, 0.9 * HEIGHT);
+
+    pattern = cairo_pattern_create_linear (WIDTH, 0, 0, HEIGHT);
+    cairo_pattern_add_color_stop_rgba (pattern, 0.2, 0, 0, 1, 1);
+    cairo_pattern_add_color_stop_rgba (pattern, 0.8, 0, 0, 1, 0);
+
+    cairo_translate (cr, PAD, PAD);
+
+    for (n = 0; n < N_OPERATORS; n++) {
+	cairo_save (cr);
+	for (i = 0; i < 4; i++) {
+	    cairo_reset_clip (cr);
+	    cairo_rectangle (cr, 0, 0, WIDTH, HEIGHT);
+	    cairo_clip (cr);
+
+	    cairo_set_source (cr, pattern);
+	    cairo_set_operator (cr, CAIRO_OPERATOR_OVER);
+	    if (i & 2) {
+	        cairo_paint (cr);
+	    } else {
+	        cairo_rectangle (cr, WIDTH/2, HEIGHT/2, WIDTH, HEIGHT);
+		cairo_fill (cr);
+	    }
+
+	    cairo_set_source (cr, i & 1 ? alpha_pattern : color_alpha_pattern);
+	    cairo_set_operator (cr, n);
+	    if (i & 2) {
+	        cairo_paint (cr);
+	    } else {
+	        cairo_rectangle (cr, WIDTH/2, HEIGHT/2, WIDTH, HEIGHT);
+		cairo_fill (cr);
+	    }
+
+	    cairo_translate (cr, 0, HEIGHT+PAD);
+	}
+	cairo_restore (cr);
+
+	cairo_translate (cr, WIDTH+PAD, 0);
+    }
+
+    cairo_pattern_destroy (pattern);
+    cairo_pattern_destroy (alpha_pattern);
+    cairo_pattern_destroy (color_alpha_pattern);
+
+    return CAIRO_TEST_SUCCESS;
+}
+
+CAIRO_TEST (surface_pattern_operator,
+	    "Tests alpha-only and alpha-color sources with all operators",
+	    "surface, pattern, operator", /* keywords */
+	    NULL, /* requirements */
+	    (WIDTH+PAD) * N_OPERATORS + PAD, 4*HEIGHT + 5*PAD,
+	    NULL, draw)