third_party/WebKit/Source/platform/fonts/FontTest.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 "platform/fonts/Font.h"

#include "platform/graphics/paint/PaintFlags.h"
#include "platform/testing/FontTestHelpers.h"
#include "platform/testing/UnitTestHelpers.h"
#include "platform/text/TextRun.h"
#include "testing/gtest/include/gtest/gtest.h"

using blink::testing::CreateTestFont;

namespace blink {

TEST(FontTest, TextIntercepts) {
  Font font =
      CreateTestFont("Ahem", testing::PlatformTestDataPath("Ahem.woff"), 16);
  // A sequence of LATIN CAPITAL LETTER E WITH ACUTE and LATIN SMALL LETTER P
  // characters. E ACUTES are squares above the baseline in Ahem, while p's
  // are rectangles below the baseline.
  UChar ahem_above_below_baseline_string[] = {0xc9, 0x70, 0xc9, 0x70, 0xc9,
                                              0x70, 0xc9, 0x70, 0xc9};
  TextRun ahem_above_below_baseline(ahem_above_below_baseline_string, 9);
  TextRunPaintInfo text_run_paint_info(ahem_above_below_baseline);
  PaintFlags default_paint;
  float device_scale_factor = 1;

  std::tuple<float, float> below_baseline_bounds = std::make_tuple(2, 4);
  Vector<Font::TextIntercept> text_intercepts;
  // 4 intercept ranges for below baseline p glyphs in the test string
  font.GetTextIntercepts(text_run_paint_info, device_scale_factor,
                         default_paint, below_baseline_bounds, text_intercepts);
  EXPECT_EQ(text_intercepts.size(), 4u);
  for (auto text_intercept : text_intercepts) {
    EXPECT_GT(text_intercept.end_, text_intercept.begin_);
  }

  std::tuple<float, float> above_baseline_bounds = std::make_tuple(-4, -2);
  // 5 intercept ranges for the above baseline E ACUTE glyphs
  font.GetTextIntercepts(text_run_paint_info, device_scale_factor,
                         default_paint, above_baseline_bounds, text_intercepts);
  EXPECT_EQ(text_intercepts.size(), 5u);
  for (auto text_intercept : text_intercepts) {
    EXPECT_GT(text_intercept.end_, text_intercept.begin_);
  }
}

}  // namespace blink