test: verify that gradients do not crash pixman

Test gradients under particular conditions (no stops, all the stops
at the same offset) to check that pixman does not misbehave.

2 files changed, 119 insertions, 0 deletions

diff --git a/test/Makefile.am b/test/Makefile.am
index d0019ef9..20cb00f8 100644
--- a/test/Makefile.am
+++ b/test/Makefile.am
@@ -10,6 +10,7 @@ TESTPROGRAMS =			\
 	fetch-test		\
 	oob-test		\
 	window-test		\
+	gradient-crash-test	\
 	trap-crasher		\
 	alphamap		\
 	blitters-test		\
@@ -19,6 +20,7 @@ TESTPROGRAMS =			\
 a1_trap_test_LDADD = $(TEST_LDADD)
 fetch_test_LDADD = $(TEST_LDADD)
 composite_LDADD = $(TEST_LDADD)
+gradient_crash_test_LDADD = $(TEST_LDADD)
 trap_crasher_LDADD = $(TEST_LDADD)
 oob_test_LDADD = $(TEST_LDADD)
 window_test_LDADD = $(TEST_LDADD)
diff --git a/test/gradient-crash-test.c b/test/gradient-crash-test.c
new file mode 100644
index 00000000..804f83bc
--- /dev/null
+++ b/test/gradient-crash-test.c
@@ -0,0 +1,117 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include "pixman.h"
+
+int
+main (int argc, char **argv)
+{
+#define WIDTH 400
+#define HEIGHT 200
+    
+    uint32_t *dest = malloc (WIDTH * HEIGHT * 4);
+    pixman_image_t *src_img;
+    pixman_image_t *dest_img;
+    int i, j;
+
+    pixman_gradient_stop_t onestop[1] =
+	{
+	    { pixman_int_to_fixed (1), { 0xffff, 0xeeee, 0xeeee, 0xeeee } },
+	};
+
+    pixman_gradient_stop_t subsetstops[2] =
+	{
+	    { pixman_int_to_fixed (1), { 0xffff, 0xeeee, 0xeeee, 0xeeee } },
+	    { pixman_int_to_fixed (1), { 0xffff, 0xeeee, 0xeeee, 0xeeee } },
+	};
+
+    pixman_gradient_stop_t stops01[2] =
+	{
+	    { pixman_int_to_fixed (0), { 0xffff, 0xeeee, 0xeeee, 0xeeee } },
+	    { pixman_int_to_fixed (1), { 0xffff, 0x1111, 0x1111, 0x1111 } }
+	};
+
+    pixman_point_fixed_t p1 = { pixman_double_to_fixed (0), 0 };
+    pixman_point_fixed_t p2 = { pixman_double_to_fixed (WIDTH / 8.),
+				pixman_int_to_fixed (0) };
+
+#if 0
+    pixman_transform_t trans = {
+	{ { pixman_double_to_fixed (2), pixman_double_to_fixed (0.5), pixman_double_to_fixed (-100), },
+	  { pixman_double_to_fixed (0), pixman_double_to_fixed (3), pixman_double_to_fixed (0), },
+	  { pixman_double_to_fixed (0), pixman_double_to_fixed (0.000), pixman_double_to_fixed (1.0) } 
+	}
+    };
+#else
+    pixman_transform_t trans = {
+	{ { pixman_fixed_1, 0, 0 },
+	  { 0, pixman_fixed_1, 0 },
+	  { 0, 0, pixman_fixed_1 } }
+    };
+#endif
+
+    pixman_point_fixed_t c_inner;
+    pixman_point_fixed_t c_outer;
+    pixman_fixed_t r_inner;
+    pixman_fixed_t r_outer;
+    
+    for (i = 0; i < WIDTH * HEIGHT; ++i)
+	dest[i] = 0x4f00004f; /* pale blue */
+    
+    dest_img = pixman_image_create_bits (PIXMAN_a8r8g8b8,
+					 WIDTH, HEIGHT, 
+					 dest,
+					 WIDTH * 4);
+
+    c_inner.x = pixman_double_to_fixed (50.0);
+    c_inner.y = pixman_double_to_fixed (50.0);
+    c_outer.x = pixman_double_to_fixed (50.0);
+    c_outer.y = pixman_double_to_fixed (50.0);
+    r_inner = 0;
+    r_outer = pixman_double_to_fixed (50.0);
+    
+    for (i = 0; i < 3; ++i)
+    {
+	pixman_gradient_stop_t *stops;
+        int num_stops;
+	if (i == 0)
+	{
+	    stops = onestop;
+	    num_stops = sizeof(onestop) / sizeof(onestop[0]);
+	}
+	else if (i == 1)
+	{
+	    stops = subsetstops;
+	    num_stops = sizeof(subsetstops) / sizeof(subsetstops[0]);
+	}
+	else
+	{
+	    stops = stops01;
+	    num_stops = sizeof(stops01) / sizeof(stops01[0]);
+	}
+	
+	for (j = 0; j < 3; ++j)
+	{
+	    if (j == 0)
+	        src_img = pixman_image_create_conical_gradient (&c_inner, r_inner,
+								stops, num_stops);
+	    else if (j == 1)
+	        src_img = pixman_image_create_radial_gradient  (&c_inner, &c_outer,
+								r_inner, r_outer,
+								stops, num_stops);
+	    else
+	        src_img = pixman_image_create_linear_gradient  (&p1, &p2,
+								stops, num_stops);
+	    pixman_image_set_transform (src_img, &trans);
+	    pixman_image_set_repeat (src_img, PIXMAN_REPEAT_NONE);
+	    pixman_image_composite (PIXMAN_OP_OVER, src_img, NULL, dest_img,
+				    0, 0, 0, 0, 0, 0, 10 * WIDTH, HEIGHT);
+
+	}
+	pixman_image_unref (src_img);
+    }
+
+    pixman_image_unref (dest_img);
+    free (dest);
+    
+    return 0;
+}