add SkUnichar_IsVariationSelector()

git-svn-id: http://skia.googlecode.com/svn/trunk@2915 2bbb7eff-a529-9590-31e7-b0007b416f81

gyp/tests.gyp

@@ -64,6 +64,7 @@
         '../tests/Test.h',
         '../tests/TestSize.cpp',
         '../tests/ToUnicode.cpp',
+        '../tests/UnicodeTest.cpp',
         '../tests/UtilsTest.cpp',
         '../tests/WArrayTest.cpp',
         '../tests/WritePixelsTest.cpp',

include/core/SkUtils.h

@@ -91,6 +91,21 @@ size_t SkUTF16_FromUnichar(SkUnichar uni, uint16_t utf16[] = NULL);
 size_t SkUTF16_ToUTF8(const uint16_t utf16[], int numberOf16BitValues,
                            char utf8[] = NULL);
 
+static bool SkUnichar_IsVariationSelector(SkUnichar uni) {
+/*  The 'true' ranges are:
+ *      0x180B  <= uni <=  0x180D
+ *      0xFE00  <= uni <=  0xFE0F
+ *      0xE0100 <= uni <= 0xE01EF
+ */
+    if (uni < 0x180B || uni > 0xE01EF) {
+        return false;
+    }
+    if ((uni > 0x180D && uni < 0xFE00) || (uni > 0xFE0F && uni < 0xE0100)) {
+        return false;
+    }
+    return true;
+}
+
 ///////////////////////////////////////////////////////////////////////////////
 
 class SkAutoTrace {

tests/UnicodeTest.cpp

@@ -0,0 +1,45 @@
+
+/*
+ * 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"
+
+// Unicode Variation Selector ranges: inclusive
+#define UVS_MIN0    0x180B
+#define UVS_MAX0    0x180D
+#define UVS_MIN1    0xFE00
+#define UVS_MAX1    0xFE0F
+#define UVS_MIN2    0xE0100
+#define UVS_MAX2    0xE01EF
+
+static bool isUVS(SkUnichar uni) {
+    return (uni >= UVS_MIN0 && uni <= UVS_MAX0) ||
+           (uni >= UVS_MIN1 && uni <= UVS_MAX1) ||
+           (uni >= UVS_MIN2 && uni <= UVS_MAX2);
+}
+
+static void test_uvs(skiatest::Reporter* reporter) {
+    // [min, max], [min, max] ... inclusive
+    static const SkUnichar gRanges[] = {
+        UVS_MIN0, UVS_MAX0, UVS_MIN1, UVS_MAX1, UVS_MIN2, UVS_MAX2
+    };
+
+    for (size_t i = 0; i < SK_ARRAY_COUNT(gRanges); i += 2) {
+        for (SkUnichar uni = gRanges[i] - 8; uni <= gRanges[i+1] + 8; ++uni) {
+            bool uvs0 = isUVS(uni);
+            bool uvs1 = SkUnichar_IsVariationSelector(uni);
+            REPORTER_ASSERT(reporter, uvs0 == uvs1);
+        }
+    }
+}
+
+static void TestUnicode(skiatest::Reporter* reporter) {
+    test_uvs(reporter);
+}
+
+#include "TestClassDef.h"
+DEFINE_TESTCLASS("Unicode", TestUnicodeClass, TestUnicode)