Adding backgroundColor to WebCompositionUnderline and using it for InlineTextBox drawing.

Source/core/editing/CompositionUnderlineRangeFilterTest.cpp

Index: Source/core/editing/CompositionUnderlineRangeFilterTest.cpp
diff --git a/Source/core/editing/CompositionUnderlineRangeFilterTest.cpp b/Source/core/editing/CompositionUnderlineRangeFilterTest.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..ce9908bb13da6d1d63d11161350932e8c7bafab7
--- /dev/null
+++ b/Source/core/editing/CompositionUnderlineRangeFilterTest.cpp
@@ -0,0 +1,90 @@
+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "config.h"
+#include "core/editing/CompositionUnderlineRangeFilter.h"
+
+#include "core/editing/CompositionUnderline.h"
+#include "platform/graphics/Color.h"
+#include "wtf/Vector.h"
+#include "wtf/text/IntegerToStringConversion.h"
+#include "wtf/text/WTFString.h"
+#include <gtest/gtest.h>
+
+using namespace WebCore;
+
+namespace {
+
+// Parses test case string and populate |underlines|.
+void initUnderlines(const String& testCase, Vector<CompositionUnderline>* underlines)
+{
+    ASSERT(underlines && underlines->size() == 0U);
+    Vector<String> rangeList;
+    testCase.split("|", rangeList);
+    // Intervals are named 'A', 'B', ..., 'Z', so ensure there aren't too many.
+    ASSERT_LE(rangeList.size(), static_cast<size_t>('Z' - 'A'));
+    for (unsigned i = 0; i < rangeList.size(); ++i) {
+        String range = rangeList[i];
+        Vector<String> toks;
+        rangeList[i].split(",", toks);
+        ASSERT_EQ(2U, toks.size());
+        int startOffset = toks[0].toInt();
+        int endOffset = toks[1].toInt();
+        ASSERT_LE(startOffset, endOffset);
+        // For testing: Store i in red component of |color|, so the intervals
+        // can be distinguished.
+        underlines->append(CompositionUnderline(startOffset, endOffset, Color(i, 0, 0), false, 0));
+    }
+}
+
+// Runs the filter and encodes the result into a string, with 'A' as first
+// elemnt, 'B' as second, etc.
+String filterUnderlines(const Vector<CompositionUnderline>& underlines, int indexLo, int indexHi)
+{
+    CompositionUnderlineRangeFilter filter(underlines, indexLo, indexHi);
+    String ret = "";
+    for (CompositionUnderlineRangeFilter::ConstIterator it = filter.begin(); it != filter.end(); ++it) {
+        int code = (*it).color.red();
+        ret.append(static_cast<char>('A' + code));
+    }
+    return ret;
+}
+
+TEST(CompositionUnderlineRangeFilterTest, Empty)
+{
+    Vector<CompositionUnderline> underlines;
+    EXPECT_EQ("", filterUnderlines(underlines, 0, 10));
+    EXPECT_EQ("", filterUnderlines(underlines, 5, 5));
+}
+
+TEST(CompositionUnderlineRangeFilterTest, Single)
+{
+    String testCase = "10,20"; // Semi-closed interval: {10, 11, ..., 19}.
+    Vector<CompositionUnderline> underlines;
+    initUnderlines(testCase, &underlines);
+    // The query intervals are all closed, e.g., [0, 9] = {0, ..., 9}.
+    EXPECT_EQ("", filterUnderlines(underlines, 0, 9));
+    EXPECT_EQ("A", filterUnderlines(underlines, 5, 10));
+    EXPECT_EQ("A", filterUnderlines(underlines, 10, 20));
+    EXPECT_EQ("A", filterUnderlines(underlines, 15, 25));
+    EXPECT_EQ("A", filterUnderlines(underlines, 19, 30));
+    EXPECT_EQ("", filterUnderlines(underlines, 20, 25));
+    EXPECT_EQ("A", filterUnderlines(underlines, 5, 25));
+}
+
+TEST(CompositionUnderlineRangeFilterTest, Multi)
+{
+    String testCase = "0,2|0,5|1,3|1,10|3,5|5,8|7,8|8,10";
+    Vector<CompositionUnderline> underlines;
+    initUnderlines(testCase, &underlines);
+    EXPECT_EQ("", filterUnderlines(underlines, 11, 11));
+    EXPECT_EQ("ABCDEFGH", filterUnderlines(underlines, 0, 9));
+    EXPECT_EQ("BDEF", filterUnderlines(underlines, 4, 5));
+    EXPECT_EQ("AB", filterUnderlines(underlines, 0, 0));
+    EXPECT_EQ("BDE", filterUnderlines(underlines, 3, 3));
+    EXPECT_EQ("DF", filterUnderlines(underlines, 5, 5));
+    EXPECT_EQ("DFG", filterUnderlines(underlines, 7, 7));
+}
+
+} // namespace