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From 0df43b8ae5031dd83775d00b57b6bed809db0e89 Mon Sep 17 00:00:00 2001
From: Siarhei Siamashka <siarhei.siamashka@nokia.com>
Date: Mon, 21 Feb 2011 02:07:09 +0200
Subject: [PATCH 08/40] test: check correctness of 'bilinear_pad_repeat_get_scanline_bounds'
Individual correctness check for the new bilinear scaling related
supplementary function. This test program uses a bit wider range
of input arguments, not covered by other tests.
---
test/Makefile.am | 2 +
test/scaling-helpers-test.c | 93 +++++++++++++++++++++++++++++++++++++++++++
2 files changed, 95 insertions(+), 0 deletions(-)
create mode 100644 test/scaling-helpers-test.c
diff --git a/test/Makefile.am b/test/Makefile.am
index 057e9ce..9dc7219 100644
--- a/test/Makefile.am
+++ b/test/Makefile.am
@@ -13,6 +13,7 @@ TESTPROGRAMS = \
trap-crasher \
alpha-loop \
scaling-crash-test \
+ scaling-helpers-test \
gradient-crash-test \
alphamap \
stress-test \
@@ -33,6 +34,7 @@ alpha_loop_SOURCES = alpha-loop.c utils.c utils.h
composite_SOURCES = composite.c utils.c utils.h
gradient_crash_test_SOURCES = gradient-crash-test.c utils.c utils.h
stress_test_SOURCES = stress-test.c utils.c utils.h
+scaling_helpers_test_SOURCES = scaling-helpers-test.c utils.c utils.h
# Benchmarks
diff --git a/test/scaling-helpers-test.c b/test/scaling-helpers-test.c
new file mode 100644
index 0000000..c186138
--- /dev/null
+++ b/test/scaling-helpers-test.c
@@ -0,0 +1,93 @@
+#include <config.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <assert.h>
+#include "utils.h"
+#include "pixman-fast-path.h"
+
+/* A trivial reference implementation for
+ * 'bilinear_pad_repeat_get_scanline_bounds'
+ */
+static void
+bilinear_pad_repeat_get_scanline_bounds_ref (int32_t source_image_width,
+ pixman_fixed_t vx_,
+ pixman_fixed_t unit_x,
+ int32_t * left_pad,
+ int32_t * left_tz,
+ int32_t * width,
+ int32_t * right_tz,
+ int32_t * right_pad)
+{
+ int w = *width;
+ *left_pad = 0;
+ *left_tz = 0;
+ *width = 0;
+ *right_tz = 0;
+ *right_pad = 0;
+ int64_t vx = vx_;
+ while (--w >= 0)
+ {
+ if (vx < 0)
+ {
+ if (vx + pixman_fixed_1 < 0)
+ *left_pad += 1;
+ else
+ *left_tz += 1;
+ }
+ else if (vx + pixman_fixed_1 >= pixman_int_to_fixed (source_image_width))
+ {
+ if (vx >= pixman_int_to_fixed (source_image_width))
+ *right_pad += 1;
+ else
+ *right_tz += 1;
+ }
+ else
+ {
+ *width += 1;
+ }
+ vx += unit_x;
+ }
+}
+
+int
+main (void)
+{
+ int i;
+ for (i = 0; i < 10000; i++)
+ {
+ int32_t left_pad1, left_tz1, width1, right_tz1, right_pad1;
+ int32_t left_pad2, left_tz2, width2, right_tz2, right_pad2;
+ pixman_fixed_t vx = lcg_rand_N(10000 << 16) - (3000 << 16);
+ int32_t width = lcg_rand_N(10000);
+ int32_t source_image_width = lcg_rand_N(10000) + 1;
+ pixman_fixed_t unit_x = lcg_rand_N(10 << 16) + 1;
+ width1 = width2 = width;
+
+ bilinear_pad_repeat_get_scanline_bounds_ref (source_image_width,
+ vx,
+ unit_x,
+ &left_pad1,
+ &left_tz1,
+ &width1,
+ &right_tz1,
+ &right_pad1);
+
+ bilinear_pad_repeat_get_scanline_bounds (source_image_width,
+ vx,
+ unit_x,
+ &left_pad2,
+ &left_tz2,
+ &width2,
+ &right_tz2,
+ &right_pad2);
+
+ assert (left_pad1 == left_pad2);
+ assert (left_tz1 == left_tz2);
+ assert (width1 == width2);
+ assert (right_tz1 == right_tz2);
+ assert (right_pad1 == right_pad2);
+ }
+
+ return 0;
+}
--
1.6.6.1
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