third_party/WebKit/Source/core/css/CSSFontFaceSourceTest.cpp

// Copyright 2016 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 "core/css/CSSFontFaceSource.h"

#include "platform/fonts/FontCacheKey.h"
#include "platform/fonts/FontDescription.h"
#include "platform/fonts/FontPlatformData.h"
#include "platform/fonts/SimpleFontData.h"
#include "platform/graphics/skia/SkiaUtils.h"
#include "testing/gtest/include/gtest/gtest.h"

namespace blink {

class DummyFontFaceSource : public CSSFontFaceSource {
 public:
  PassRefPtr<SimpleFontData> createFontData(const FontDescription&) override {
    return SimpleFontData::create(
        FontPlatformData(SkTypeface::MakeDefault(), "", 0, false, false));
  }

  DummyFontFaceSource() {}

  PassRefPtr<SimpleFontData> getFontDataForSize(float size) {
    FontDescription fontDescription;
    fontDescription.setSizeAdjust(size);
    fontDescription.setAdjustedSize(size);
    return getFontData(fontDescription);
  }
};

namespace {

unsigned simulateHashCalculation(float size) {
  FontDescription fontDescription;
  fontDescription.setSizeAdjust(size);
  fontDescription.setAdjustedSize(size);
  return fontDescription.cacheKey(FontFaceCreationParams()).hash();
}
}

TEST(CSSFontFaceSourceTest, HashCollision) {
  DummyFontFaceSource fontFaceSource;
  // Even if the hash value collide, fontface cache should return different
  // value for different fonts.
  EXPECT_EQ(simulateHashCalculation(2821), simulateHashCalculation(3346));
  EXPECT_NE(fontFaceSource.getFontDataForSize(2821),
            fontFaceSource.getFontDataForSize(3346));
}

}  // namespace blink