engine/src/flutter/impeller/geometry/path_source_unittests.cc

// Copyright 2013 The Flutter 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 "impeller/geometry/path_source.h"

#include "gtest/gtest.h"

#include "flutter/display_list/testing/dl_test_mock_path_receiver.h"
#include "flutter/testing/testing.h"
#include "impeller/geometry/dashed_line_path_source.h"
#include "impeller/geometry/rect.h"
#include "impeller/geometry/round_rect.h"
#include "impeller/geometry/round_superellipse.h"

namespace impeller {
namespace testing {

using ::flutter::testing::DlPathReceiverMock;
using ::testing::Return;

TEST(PathSourceTest, RectSourceTest) {
  Rect rect = Rect::MakeLTRB(10, 15, 20, 30);
  RectPathSource source(rect);

  EXPECT_TRUE(source.IsConvex());
  EXPECT_EQ(source.GetFillType(), FillType::kNonZero);
  EXPECT_EQ(source.GetBounds(), Rect::MakeLTRB(10, 15, 20, 30));

  ::testing::StrictMock<DlPathReceiverMock> receiver;

  {
    ::testing::Sequence sequence;

    EXPECT_CALL(receiver, MoveTo(Point(10, 15), true));
    EXPECT_CALL(receiver, LineTo(Point(20, 15)));
    EXPECT_CALL(receiver, LineTo(Point(20, 30)));
    EXPECT_CALL(receiver, LineTo(Point(10, 30)));
    EXPECT_CALL(receiver, LineTo(Point(10, 15)));
    EXPECT_CALL(receiver, Close());
  }

  source.Dispatch(receiver);
}

TEST(PathSourceTest, EllipseSourceTest) {
  Rect rect = Rect::MakeLTRB(10, 15, 20, 30);
  EllipsePathSource source(rect);

  EXPECT_TRUE(source.IsConvex());
  EXPECT_EQ(source.GetFillType(), FillType::kNonZero);
  EXPECT_EQ(source.GetBounds(), Rect::MakeLTRB(10, 15, 20, 30));

  ::testing::StrictMock<DlPathReceiverMock> receiver;

  {
    ::testing::Sequence sequence;

    EXPECT_CALL(receiver, MoveTo(Point(10, 22.5), true));
    EXPECT_CALL(receiver, ConicTo(Point(10, 15), Point(15, 15), kSqrt2Over2));
    EXPECT_CALL(receiver, ConicTo(Point(20, 15), Point(20, 22.5), kSqrt2Over2));
    EXPECT_CALL(receiver, ConicTo(Point(20, 30), Point(15, 30), kSqrt2Over2));
    EXPECT_CALL(receiver, ConicTo(Point(10, 30), Point(10, 22.5), kSqrt2Over2));
    EXPECT_CALL(receiver, Close());
  }

  source.Dispatch(receiver);
}

TEST(PathSourceTest, RoundRectSourceTest) {
  Rect rect = Rect::MakeLTRB(10, 15, 40, 60);
  RoundingRadii radii = {
      .top_left = Size(1, 11),
      .top_right = Size(2, 12),
      .bottom_left = Size(4, 14),
      .bottom_right = Size(3, 13),
  };
  RoundRect round_rect = RoundRect::MakeRectRadii(rect, radii);
  RoundRectPathSource source(round_rect);

  EXPECT_TRUE(source.IsConvex());
  EXPECT_EQ(source.GetFillType(), FillType::kNonZero);
  EXPECT_EQ(source.GetBounds(), Rect::MakeLTRB(10, 15, 40, 60));

  ::testing::StrictMock<DlPathReceiverMock> receiver;

  {
    ::testing::Sequence sequence;

    EXPECT_CALL(receiver, MoveTo(Point(11, 15), true));
    EXPECT_CALL(receiver, LineTo(Point(38, 15)));
    EXPECT_CALL(receiver, ConicTo(Point(40, 15), Point(40, 27), kSqrt2Over2));
    EXPECT_CALL(receiver, LineTo(Point(40, 47)));
    EXPECT_CALL(receiver, ConicTo(Point(40, 60), Point(37, 60), kSqrt2Over2));
    EXPECT_CALL(receiver, LineTo(Point(14, 60)));
    EXPECT_CALL(receiver, ConicTo(Point(10, 60), Point(10, 46), kSqrt2Over2));
    EXPECT_CALL(receiver, LineTo(Point(10, 26)));
    EXPECT_CALL(receiver, ConicTo(Point(10, 15), Point(11, 15), kSqrt2Over2));
    EXPECT_CALL(receiver, Close());
  }

  source.Dispatch(receiver);
}

TEST(PathSourceTest, DiffRoundRectSourceTest) {
  Rect outer_rect = Rect::MakeLTRB(10, 15, 200, 300);
  Rect inner_rect = Rect::MakeLTRB(50, 60, 100, 200);
  ASSERT_TRUE(outer_rect.Contains(inner_rect));
  RoundingRadii radii = {
      .top_left = Size(1, 11),
      .top_right = Size(2, 12),
      .bottom_left = Size(4, 14),
      .bottom_right = Size(3, 13),
  };
  RoundRect outer_rrect = RoundRect::MakeRectRadii(outer_rect, radii);
  RoundRect inner_rrect = RoundRect::MakeRectRadii(inner_rect, radii);
  DiffRoundRectPathSource source(outer_rrect, inner_rrect);

  EXPECT_FALSE(source.IsConvex());
  EXPECT_EQ(source.GetFillType(), FillType::kOdd);
  EXPECT_EQ(source.GetBounds(), Rect::MakeLTRB(10, 15, 200, 300));

  ::testing::StrictMock<DlPathReceiverMock> receiver;

  {
    ::testing::Sequence sequence;

    EXPECT_CALL(receiver, MoveTo(Point(11, 15), true));
    EXPECT_CALL(receiver, LineTo(Point(198, 15)));
    EXPECT_CALL(receiver, ConicTo(Point(200, 15), Point(200, 27), kSqrt2Over2));
    EXPECT_CALL(receiver, LineTo(Point(200, 287)));
    EXPECT_CALL(receiver,
                ConicTo(Point(200, 300), Point(197, 300), kSqrt2Over2));
    EXPECT_CALL(receiver, LineTo(Point(14, 300)));
    EXPECT_CALL(receiver, ConicTo(Point(10, 300), Point(10, 286), kSqrt2Over2));
    EXPECT_CALL(receiver, LineTo(Point(10, 26)));
    EXPECT_CALL(receiver, ConicTo(Point(10, 15), Point(11, 15), kSqrt2Over2));
    // RetiresOnSaturation keeps identical calls from matching each other
    EXPECT_CALL(receiver, Close()).RetiresOnSaturation();

    EXPECT_CALL(receiver, MoveTo(Point(51, 60), true));
    EXPECT_CALL(receiver, LineTo(Point(98, 60)));
    EXPECT_CALL(receiver, ConicTo(Point(100, 60), Point(100, 72), kSqrt2Over2));
    EXPECT_CALL(receiver, LineTo(Point(100, 187)));
    EXPECT_CALL(receiver,
                ConicTo(Point(100, 200), Point(97, 200), kSqrt2Over2));
    EXPECT_CALL(receiver, LineTo(Point(54, 200)));
    EXPECT_CALL(receiver, ConicTo(Point(50, 200), Point(50, 186), kSqrt2Over2));
    EXPECT_CALL(receiver, LineTo(Point(50, 71)));
    EXPECT_CALL(receiver, ConicTo(Point(50, 60), Point(51, 60), kSqrt2Over2));
    // RetiresOnSaturation keeps identical calls from matching each other
    EXPECT_CALL(receiver, Close()).RetiresOnSaturation();
  }

  source.Dispatch(receiver);
}

TEST(PathSourceTest, DashedLinePathSource) {
  DashedLinePathSource source(Point(10, 10), Point(30, 10), 5, 5);

  EXPECT_FALSE(source.IsConvex());
  EXPECT_EQ(source.GetFillType(), FillType::kNonZero);
  EXPECT_EQ(source.GetBounds(), Rect::MakeLTRB(10, 10, 30, 10));

  ::testing::StrictMock<DlPathReceiverMock> receiver;

  {
    ::testing::Sequence sequence;

    EXPECT_CALL(receiver, MoveTo(Point(10, 10), false));
    EXPECT_CALL(receiver, LineTo(Point(15, 10)));
    EXPECT_CALL(receiver, MoveTo(Point(20, 10), false));
    EXPECT_CALL(receiver, LineTo(Point(25, 10)));
  }

  source.Dispatch(receiver);
}

TEST(PathSourceTest, EmptyDashedLinePathSource) {
  DashedLinePathSource source(Point(10, 10), Point(10, 10), 5, 5);

  EXPECT_FALSE(source.IsConvex());
  EXPECT_EQ(source.GetFillType(), FillType::kNonZero);
  EXPECT_EQ(source.GetBounds(), Rect::MakeLTRB(10, 10, 10, 10));

  ::testing::StrictMock<DlPathReceiverMock> receiver;

  {
    ::testing::Sequence sequence;

    EXPECT_CALL(receiver, MoveTo(Point(10, 10), false));
    EXPECT_CALL(receiver, LineTo(Point(10, 10)));
  }

  source.Dispatch(receiver);
}

TEST(PathSourceTest, DashedLinePathSourceZeroOffGaps) {
  DashedLinePathSource source(Point(10, 10), Point(30, 10), 5, 0);

  EXPECT_FALSE(source.IsConvex());
  EXPECT_EQ(source.GetFillType(), FillType::kNonZero);
  EXPECT_EQ(source.GetBounds(), Rect::MakeLTRB(10, 10, 30, 10));

  ::testing::StrictMock<DlPathReceiverMock> receiver;

  {
    ::testing::Sequence sequence;

    EXPECT_CALL(receiver, MoveTo(Point(10, 10), false));
    EXPECT_CALL(receiver, LineTo(Point(30, 10)));
  }

  source.Dispatch(receiver);
}

TEST(PathSourceTest, DashedLinePathSourceInvalidOffGaps) {
  DashedLinePathSource source(Point(10, 10), Point(30, 10), 5, -1);

  EXPECT_FALSE(source.IsConvex());
  EXPECT_EQ(source.GetFillType(), FillType::kNonZero);
  EXPECT_EQ(source.GetBounds(), Rect::MakeLTRB(10, 10, 30, 10));

  ::testing::StrictMock<DlPathReceiverMock> receiver;

  {
    ::testing::Sequence sequence;

    EXPECT_CALL(receiver, MoveTo(Point(10, 10), false));
    EXPECT_CALL(receiver, LineTo(Point(30, 10)));
  }

  source.Dispatch(receiver);
}

TEST(PathSourceTest, DashedLinePathSourceInvalidOnRegion) {
  DashedLinePathSource source(Point(10, 10), Point(30, 10), -1, 5);

  EXPECT_FALSE(source.IsConvex());
  EXPECT_EQ(source.GetFillType(), FillType::kNonZero);
  EXPECT_EQ(source.GetBounds(), Rect::MakeLTRB(10, 10, 30, 10));

  ::testing::StrictMock<DlPathReceiverMock> receiver;

  {
    ::testing::Sequence sequence;

    EXPECT_CALL(receiver, MoveTo(Point(10, 10), false));
    EXPECT_CALL(receiver, LineTo(Point(30, 10)));
  }

  source.Dispatch(receiver);
}

TEST(PathSourceTest, PathTransformerRectSourceTest) {
  Matrix matrix =
      Matrix::MakeTranslateScale({2.0f, 3.0f, 1.0f}, {1.5f, 4.25f, 0.0f});
  Rect rect = Rect::MakeLTRB(10, 15, 20, 30);
  RectPathSource source(rect);

  EXPECT_TRUE(source.IsConvex());
  EXPECT_EQ(source.GetFillType(), FillType::kNonZero);
  EXPECT_EQ(source.GetBounds(), Rect::MakeLTRB(10, 15, 20, 30));

  ::testing::StrictMock<DlPathReceiverMock> mock_receiver;
  PathTransformer receiver = PathTransformer(mock_receiver, matrix);

  {
    ::testing::Sequence sequence;

    EXPECT_CALL(mock_receiver, MoveTo(Point(21.5f, 49.25f), true));
    EXPECT_CALL(mock_receiver, LineTo(Point(41.5f, 49.25f)));
    EXPECT_CALL(mock_receiver, LineTo(Point(41.5f, 94.25f)));
    EXPECT_CALL(mock_receiver, LineTo(Point(21.5f, 94.25f)));
    EXPECT_CALL(mock_receiver, LineTo(Point(21.5f, 49.25f)));
    EXPECT_CALL(mock_receiver, Close());
  }

  source.Dispatch(receiver);
}

TEST(PathSourceTest, PathTransformerAllSegmentsTest) {
  Matrix matrix =
      Matrix::MakeTranslateScale({2.0f, 3.0f, 1.0f}, {1.5f, 4.25f, 0.0f});

  ::testing::StrictMock<DlPathReceiverMock> mock_receiver;
  PathTransformer receiver = PathTransformer(mock_receiver, matrix);

  {
    ::testing::Sequence sequence;

    EXPECT_CALL(mock_receiver, MoveTo(Point(21.5f, 49.25f), false));
    EXPECT_CALL(mock_receiver, LineTo(Point(41.5f, 49.25f)));

    EXPECT_CALL(mock_receiver, MoveTo(Point(221.5f, 349.25f), true));
    EXPECT_CALL(mock_receiver,
                QuadTo(Point(241.5f, 349.25f), Point(241.5f, 394.25f)));
    EXPECT_CALL(mock_receiver,
                ConicTo(Point(237.5f, 409.25f), Point(231.5f, 409.25f), 5))
        .WillOnce(Return(true));
    EXPECT_CALL(mock_receiver,
                ConicTo(Point(225.5f, 409.25f), Point(221.5f, 394.25f), 6))
        .WillOnce(Return(false));
    EXPECT_CALL(mock_receiver,
                CubicTo(Point(211.5f, 379.25f), Point(211.5f, 364.25f),
                        Point(221.5f, 349.25f)));
    EXPECT_CALL(mock_receiver, Close());
  }

  receiver.MoveTo(Point(10, 15), false);
  receiver.LineTo(Point(20, 15));

  receiver.MoveTo(Point(110, 115), true);
  receiver.QuadTo(Point(120, 115), Point(120, 130));
  EXPECT_TRUE(receiver.ConicTo(Point(118, 135), Point(115, 135), 5));
  EXPECT_FALSE(receiver.ConicTo(Point(112, 135), Point(110, 130), 6));
  receiver.CubicTo(Point(105, 125), Point(105, 120), Point(110, 115));
  receiver.Close();
}

}  // namespace testing
}  // namespace impeller