third_party/WebKit/Source/platform/fonts/GlyphBufferTest.cpp

// 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 "platform/fonts/GlyphBuffer.h"

#include "platform/fonts/SimpleFontData.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "wtf/PassRefPtr.h"
#include "wtf/RefPtr.h"

namespace blink {

namespace {

// Minimal TestSimpleFontData implementation.
// Font has no glyphs, but that's okay.
class TestSimpleFontData : public SimpleFontData {
 public:
  static PassRefPtr<TestSimpleFontData> create() {
    return adoptRef(new TestSimpleFontData);
  }

 private:
  TestSimpleFontData() : SimpleFontData(nullptr, 10, false, false) {}
};

}  // anonymous namespace

TEST(GlyphBufferTest, StartsEmpty) {
  GlyphBuffer glyphBuffer;
  EXPECT_TRUE(glyphBuffer.isEmpty());
  EXPECT_EQ(0u, glyphBuffer.size());
}

TEST(GlyphBufferTest, StoresGlyphs) {
  RefPtr<SimpleFontData> font1 = TestSimpleFontData::create();
  RefPtr<SimpleFontData> font2 = TestSimpleFontData::create();

  GlyphBuffer glyphBuffer;
  glyphBuffer.add(42, font1.get(), 10);
  glyphBuffer.add(43, font1.get(), 15);
  glyphBuffer.add(44, font2.get(), 22);

  EXPECT_FALSE(glyphBuffer.isEmpty());
  EXPECT_FALSE(glyphBuffer.hasVerticalOffsets());
  EXPECT_EQ(3u, glyphBuffer.size());

  EXPECT_EQ(42, glyphBuffer.glyphAt(0));
  EXPECT_EQ(43, glyphBuffer.glyphAt(1));
  EXPECT_EQ(44, glyphBuffer.glyphAt(2));

  const Glyph* glyphs = glyphBuffer.glyphs(0);
  EXPECT_EQ(42, glyphs[0]);
  EXPECT_EQ(43, glyphs[1]);
  EXPECT_EQ(44, glyphs[2]);
}

TEST(GlyphBufferTest, StoresVerticalOffsets) {
  RefPtr<SimpleFontData> font1 = TestSimpleFontData::create();
  RefPtr<SimpleFontData> font2 = TestSimpleFontData::create();

  GlyphBuffer glyphBuffer;
  EXPECT_FALSE(glyphBuffer.hasVerticalOffsets());

  glyphBuffer.add(42, font1.get(), FloatPoint(10, 0));
  glyphBuffer.add(43, font1.get(), FloatPoint(15, 0));
  glyphBuffer.add(44, font2.get(), FloatPoint(12, 2));

  EXPECT_FALSE(glyphBuffer.isEmpty());
  EXPECT_TRUE(glyphBuffer.hasVerticalOffsets());
  EXPECT_EQ(3u, glyphBuffer.size());

  const float* offsets = glyphBuffer.offsets(0);
  EXPECT_EQ(10, glyphBuffer.xOffsetAt(0));
  EXPECT_EQ(0, glyphBuffer.yOffsetAt(0));
  EXPECT_EQ(15, glyphBuffer.xOffsetAt(1));
  EXPECT_EQ(0, glyphBuffer.yOffsetAt(1));
  EXPECT_EQ(12, glyphBuffer.xOffsetAt(2));
  EXPECT_EQ(2, glyphBuffer.yOffsetAt(2));

  EXPECT_EQ(10, offsets[0]);
  EXPECT_EQ(0, offsets[1]);
  EXPECT_EQ(15, offsets[2]);
  EXPECT_EQ(0, offsets[3]);
  EXPECT_EQ(12, offsets[4]);
  EXPECT_EQ(2, offsets[5]);
}

TEST(GlyphBufferTest, StoresOffsets) {
  RefPtr<SimpleFontData> font1 = TestSimpleFontData::create();
  RefPtr<SimpleFontData> font2 = TestSimpleFontData::create();

  GlyphBuffer glyphBuffer;
  glyphBuffer.add(42, font1.get(), 10);
  glyphBuffer.add(43, font1.get(), 15);
  glyphBuffer.add(44, font2.get(), 20);

  EXPECT_FALSE(glyphBuffer.isEmpty());
  EXPECT_FALSE(glyphBuffer.hasVerticalOffsets());
  EXPECT_EQ(3u, glyphBuffer.size());

  EXPECT_EQ(10, glyphBuffer.xOffsetAt(0));
  EXPECT_EQ(15, glyphBuffer.xOffsetAt(1));
  EXPECT_EQ(20, glyphBuffer.xOffsetAt(2));

  const float* offsets = glyphBuffer.offsets(0);
  EXPECT_EQ(10, offsets[0]);
  EXPECT_EQ(15, offsets[1]);
  EXPECT_EQ(20, offsets[2]);
}

TEST(GlyphBufferTest, StoresSimpleFontData) {
  RefPtr<SimpleFontData> font1 = TestSimpleFontData::create();
  RefPtr<SimpleFontData> font2 = TestSimpleFontData::create();

  GlyphBuffer glyphBuffer;
  glyphBuffer.add(42, font1.get(), 10);
  glyphBuffer.add(43, font1.get(), 15);
  glyphBuffer.add(44, font2.get(), 12);

  EXPECT_FALSE(glyphBuffer.isEmpty());
  EXPECT_EQ(3u, glyphBuffer.size());

  EXPECT_EQ(font1.get(), glyphBuffer.fontDataAt(0));
  EXPECT_EQ(font1.get(), glyphBuffer.fontDataAt(1));
  EXPECT_EQ(font2.get(), glyphBuffer.fontDataAt(2));
}

TEST(GlyphBufferTest, GlyphArrayWithOffset) {
  RefPtr<SimpleFontData> font1 = TestSimpleFontData::create();
  RefPtr<SimpleFontData> font2 = TestSimpleFontData::create();

  GlyphBuffer glyphBuffer;
  glyphBuffer.add(42, font1.get(), 10);
  glyphBuffer.add(43, font1.get(), 15);
  glyphBuffer.add(44, font2.get(), 12);

  EXPECT_FALSE(glyphBuffer.isEmpty());
  EXPECT_EQ(3u, glyphBuffer.size());

  const Glyph* glyphs = glyphBuffer.glyphs(1);
  EXPECT_EQ(43, glyphs[0]);
  EXPECT_EQ(44, glyphs[1]);
}

TEST(GlyphBufferTest, OffsetArrayWithNonZeroIndex) {
  RefPtr<SimpleFontData> font1 = TestSimpleFontData::create();
  RefPtr<SimpleFontData> font2 = TestSimpleFontData::create();

  {
    GlyphBuffer glyphBuffer;
    glyphBuffer.add(42, font1.get(), 10);
    glyphBuffer.add(43, font1.get(), 15);
    glyphBuffer.add(43, font2.get(), 12);

    EXPECT_FALSE(glyphBuffer.isEmpty());
    EXPECT_FALSE(glyphBuffer.hasVerticalOffsets());
    EXPECT_EQ(3u, glyphBuffer.size());

    const float* offsets = glyphBuffer.offsets(1);
    EXPECT_EQ(15, offsets[0]);
    EXPECT_EQ(12, offsets[1]);
  }

  {
    GlyphBuffer glyphBuffer;
    glyphBuffer.add(42, font1.get(), FloatPoint(10, 0));
    glyphBuffer.add(43, font1.get(), FloatPoint(15, 0));
    glyphBuffer.add(43, font2.get(), FloatPoint(12, 2));

    EXPECT_FALSE(glyphBuffer.isEmpty());
    EXPECT_TRUE(glyphBuffer.hasVerticalOffsets());
    EXPECT_EQ(3u, glyphBuffer.size());

    const float* offsets = glyphBuffer.offsets(1);
    EXPECT_EQ(15, offsets[0]);
    EXPECT_EQ(0, offsets[1]);
    EXPECT_EQ(12, offsets[2]);
    EXPECT_EQ(2, offsets[3]);
  }
}

}  // namespace blink