[Pixman] [PATCH 3/3] test: 'scaling-test' updated to provide better coverage

[Siarhei Siamashka]

From: Siarhei Siamashka <siarhei.siamashka at nokia.com>

Negative scale factors are now also tested. A small additional
translate transform helps to stress the use of fractional
coordinates better.

Also the number of iterations to run by default increased in order
to compensate increased variety of operations to be tested.
---
 test/scaling-test.c |   22 ++++++++++++++--------
 test/utils.h        |    7 +++++++
 2 files changed, 21 insertions(+), 8 deletions(-)

diff --git a/test/scaling-test.c b/test/scaling-test.c
index 16583d0..6aef823 100644
--- a/test/scaling-test.c
+++ b/test/scaling-test.c
@@ -12,10 +12,10 @@
 #include <stdio.h>
 #include "utils.h"
 
-#define MAX_SRC_WIDTH  10
-#define MAX_SRC_HEIGHT 10
-#define MAX_DST_WIDTH  10
-#define MAX_DST_HEIGHT 10
+#define MAX_SRC_WIDTH  16
+#define MAX_SRC_HEIGHT 16
+#define MAX_DST_WIDTH  16
+#define MAX_DST_HEIGHT 16
 #define MAX_STRIDE     4
 
 /*
@@ -38,7 +38,8 @@ test_composite (int      testnum,
     int                src_bpp;
     int                dst_bpp;
     int                w, h;
-    int                scale_x = 32768, scale_y = 32768;
+    pixman_fixed_t     scale_x = 65536, scale_y = 65536;
+    pixman_fixed_t     translate_x = 0, translate_y = 0;
     int                op;
     int                repeat = 0;
     int                src_fmt, dst_fmt;
@@ -98,9 +99,12 @@ test_composite (int      testnum,
 
     if (lcg_rand_n (8) > 0)
     {
-	scale_x = 32768 + lcg_rand_n (65536);
-	scale_y = 32768 + lcg_rand_n (65536);
+	scale_x = -32768 * 3 + lcg_rand_N (65536 * 5);
+	scale_y = -32768 * 3 + lcg_rand_N (65536 * 5);
+	translate_x = lcg_rand_N (65536);
+	translate_y = lcg_rand_N (65536);
 	pixman_transform_init_scale (&transform, scale_x, scale_y);
+	pixman_transform_translate (&transform, NULL, translate_x, translate_y);
 	pixman_image_set_transform (src_img, &transform);
     }
 
@@ -137,6 +141,8 @@ test_composite (int      testnum,
 	printf ("src_fmt=%08X, dst_fmt=%08X\n", src_fmt, dst_fmt);
 	printf ("op=%d, scale_x=%d, scale_y=%d, repeat=%d\n",
 	        op, scale_x, scale_y, repeat);
+	printf ("translate_x=%d, translate_y=%d\n",
+	        translate_x, translate_y);
 	printf ("src_width=%d, src_height=%d, dst_width=%d, dst_height=%d\n",
 	        src_width, src_height, dst_width, dst_height);
 	printf ("src_x=%d, src_y=%d, dst_x=%d, dst_y=%d\n",
@@ -236,6 +242,6 @@ main (int argc, const char *argv[])
 {
     pixman_disable_out_of_bounds_workaround ();
 
-    return fuzzer_test_main("scaling", 3000000, 0x7833766A,
+    return fuzzer_test_main("scaling", 8000000, 0x7F1AB59F,
 			    test_composite, argc, argv);
 }
diff --git a/test/utils.h b/test/utils.h
index 26a244c..003d01a 100644
--- a/test/utils.h
+++ b/test/utils.h
@@ -28,6 +28,13 @@ lcg_rand_n (int max)
     return lcg_rand () % max;
 }
 
+static inline uint32_t
+lcg_rand_N (int max)
+{
+    uint32_t lo = lcg_rand ();
+    uint32_t hi = lcg_rand () << 15;
+    return (lo | hi) % max;
+}
 
 /* CRC 32 computation
  */
-- 
1.6.4.4