add unittest for sk_memset16 and sk_memset32
git-svn-id: http://skia.googlecode.com/svn/trunk@2985 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/tests/MemsetTest.cpp b/tests/MemsetTest.cpp
new file mode 100644
index 0000000..9c1fc92
--- /dev/null
+++ b/tests/MemsetTest.cpp
@@ -0,0 +1,91 @@
+
+/*
+ * Copyright 2011 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+#include "Test.h"
+#include "SkUtils.h"
+
+static void set_zero(void* dst, size_t bytes) {
+ char* ptr = (char*)dst;
+ for (size_t i = 0; i < bytes; ++i) {
+ ptr[i] = 0;
+ }
+}
+
+#define MAX_ALIGNMENT 64
+#define MAX_COUNT ((MAX_ALIGNMENT) * 32)
+#define PAD 32
+#define TOTAL (PAD + MAX_ALIGNMENT + MAX_COUNT + PAD)
+
+#define VALUE16 0x1234
+#define VALUE32 0x12345678
+
+static bool compare16(const uint16_t base[], uint16_t value, int count) {
+ for (int i = 0; i < count; ++i) {
+ if (base[i] != value) {
+ SkDebugf("[%d] expected %x found %x\n", i, value, base[i]);
+ return false;
+ }
+ }
+ return true;
+}
+
+static bool compare32(const uint32_t base[], uint32_t value, int count) {
+ for (int i = 0; i < count; ++i) {
+ if (base[i] != value) {
+ SkDebugf("[%d] expected %x found %x\n", i, value, base[i]);
+ return false;
+ }
+ }
+ return true;
+}
+
+static void test_16(skiatest::Reporter* reporter) {
+ uint16_t buffer[TOTAL];
+
+ for (int count = 0; count < MAX_COUNT; ++count) {
+ for (int alignment = 0; alignment < MAX_ALIGNMENT; ++alignment) {
+ set_zero(buffer, sizeof(buffer));
+
+ uint16_t* base = &buffer[PAD + alignment];
+ sk_memset16(base, VALUE16, count);
+
+ compare16(buffer, 0, PAD + alignment);
+ compare16(base, VALUE16, count);
+ compare16(base + count, 0, TOTAL - count - PAD - alignment);
+ }
+ }
+}
+
+static void test_32(skiatest::Reporter* reporter) {
+ uint32_t buffer[TOTAL];
+
+ for (int count = 0; count < MAX_COUNT; ++count) {
+ for (int alignment = 0; alignment < MAX_ALIGNMENT; ++alignment) {
+ set_zero(buffer, sizeof(buffer));
+
+ uint32_t* base = &buffer[PAD + alignment];
+ sk_memset32(base, VALUE32, count);
+
+ compare32(buffer, 0, PAD + alignment);
+ compare32(base, VALUE32, count);
+ compare32(base + count, 0, TOTAL - count - PAD - alignment);
+ }
+ }
+}
+
+/**
+ * Test sk_memset16 and sk_memset32.
+ * For performance considerations, implementations may take different paths
+ * depending on the alignment of the dst, and/or the size of the count.
+ */
+static void TestMemset(skiatest::Reporter* reporter) {
+ test_16(reporter);
+ test_32(reporter);
+};
+
+#include "TestClassDef.h"
+DEFINE_TESTCLASS("Memset", TestMemsetClass, TestMemset)