aiks_dl_text_unittests.cc

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// 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 "flutter/display_list/display_list.h"
#include "flutter/display_list/dl_blend_mode.h"
#include "flutter/display_list/dl_builder.h"
#include "flutter/display_list/dl_color.h"
#include "flutter/display_list/dl_paint.h"
#include "flutter/display_list/dl_tile_mode.h"
#include "flutter/display_list/effects/dl_color_source.h"
#include "flutter/display_list/effects/dl_mask_filter.h"
#include "flutter/display_list/geometry/dl_path_builder.h"
#include "flutter/display_list/testing/dl_test_snippets.h"
#include "flutter/fml/build_config.h"
#include "flutter/impeller/display_list/aiks_unittests.h"
#include "flutter/testing/testing.h"
#include "impeller/display_list/aiks_context.h"
#include "impeller/display_list/dl_dispatcher.h"
#include "impeller/display_list/dl_text_impeller.h"
#include "impeller/entity/contents/content_context.h"
#include "impeller/entity/contents/solid_color_contents.h"
#include "impeller/entity/contents/text_contents.h"
#include "impeller/entity/entity.h"
#include "impeller/geometry/matrix.h"
#include "impeller/typographer/backends/skia/text_frame_skia.h"
 
#include "impeller/typographer/backends/skia/typographer_context_skia.h"
#include "txt/platform.h"
 
using namespace flutter;
/////////////////////////////////////////////////////
 
namespace impeller {
namespace testing {
 
struct TextRenderOptions {
  bool stroke = false;
  Scalar font_size = 50;
  Scalar stroke_width = 1;
  DlColor color = DlColor::kYellow();
  DlPoint position = DlPoint(100, 200);
  std::shared_ptr<DlMaskFilter> filter;
  bool is_subpixel = false;
};
 
bool RenderTextInCanvasSkia(const std::shared_ptr<Context>& context,
                            DisplayListBuilder& canvas,
                            const std::string& text,
                            const std::string_view& font_fixture,
                            const TextRenderOptions& options = {},
                            const std::optional<SkFont>& font = std::nullopt) {
  // Draw the baseline.
  DlPaint paint;
  paint.setColor(DlColor::kAqua().withAlpha(255 * 0.25));
  canvas.DrawRect(
      DlRect::MakeXYWH(options.position.x - 50, options.position.y, 900, 10),
      paint);
 
  // Mark the point at which the text is drawn.
  paint.setColor(DlColor::kRed().withAlpha(255 * 0.25));
  canvas.DrawCircle(options.position, 5.0, paint);
 
  // Construct the text blob.
  SkFont selected_font;
  if (!font.has_value()) {
    auto c_font_fixture = std::string(font_fixture);
    auto mapping =
        flutter::testing::OpenFixtureAsSkData(c_font_fixture.c_str());
    if (!mapping) {
      return false;
    }
    sk_sp<SkFontMgr> font_mgr = txt::GetDefaultFontManager();
    selected_font = SkFont(font_mgr->makeFromData(mapping), options.font_size);
    if (options.is_subpixel) {
      selected_font.setSubpixel(true);
    }
  } else {
    selected_font = font.value();
  }
  auto blob = SkTextBlob::MakeFromString(text.c_str(), selected_font);
  if (!blob) {
    return false;
  }
 
  // Create the Impeller text frame and draw it at the designated baseline.
  auto frame = MakeTextFrameFromTextBlobSkia(blob);
 
  DlPaint text_paint;
  text_paint.setColor(options.color);
  text_paint.setMaskFilter(options.filter);
  text_paint.setStrokeWidth(options.stroke_width);
  text_paint.setDrawStyle(options.stroke ? DlDrawStyle::kStroke
                                         : DlDrawStyle::kFill);
  canvas.DrawText(DlTextImpeller::Make(frame), options.position.x,
                  options.position.y, text_paint);
  return true;
}
 
TEST_P(AiksTest, CanRenderTextFrame) {
  DisplayListBuilder builder;
 
  DlPaint paint;
  paint.setColor(DlColor::ARGB(1, 0.1, 0.1, 0.1));
  builder.DrawPaint(paint);
  ASSERT_TRUE(RenderTextInCanvasSkia(
      GetContext(), builder, "the quick brown fox jumped over the lazy dog!.?",
      "Roboto-Regular.ttf"));
 
  ASSERT_TRUE(OpenPlaygroundHere(builder.Build()));
}
 
TEST_P(AiksTest, CanRenderTextFrameWithInvertedTransform) {
  DisplayListBuilder builder;
 
  DlPaint paint;
  paint.setColor(DlColor::ARGB(1, 0.1, 0.1, 0.1));
  builder.DrawPaint(paint);
  builder.Translate(1000, 0);
  builder.Scale(-1, 1);
 
  ASSERT_TRUE(RenderTextInCanvasSkia(
      GetContext(), builder, "the quick brown fox jumped over the lazy dog!.?",
      "Roboto-Regular.ttf"));
 
  ASSERT_TRUE(OpenPlaygroundHere(builder.Build()));
}
 
TEST_P(AiksTest, CanRenderStrokedTextFrame) {
  DisplayListBuilder builder;
 
  DlPaint paint;
  paint.setColor(DlColor::ARGB(1, 0.1, 0.1, 0.1));
  builder.DrawPaint(paint);
 
  ASSERT_TRUE(RenderTextInCanvasSkia(
      GetContext(), builder, "the quick brown fox jumped over the lazy dog!.?",
      "Roboto-Regular.ttf",
      {
          .stroke = true,
      }));
  ASSERT_TRUE(OpenPlaygroundHere(builder.Build()));
}
 
TEST_P(AiksTest, CanRenderTextStrokeWidth) {
  DisplayListBuilder builder;
 
  DlPaint paint;
  paint.setColor(DlColor::ARGB(1, 0.1, 0.1, 0.1));
  builder.DrawPaint(paint);
 
  ASSERT_TRUE(RenderTextInCanvasSkia(GetContext(), builder, "LMNOP VWXYZ",
                                     "Roboto-Medium.ttf",
                                     {
                                         .stroke = true,
                                         .stroke_width = 4,
                                     }));
  ASSERT_TRUE(OpenPlaygroundHere(builder.Build()));
}
 
TEST_P(AiksTest, CanRenderTextFrameWithHalfScaling) {
  DisplayListBuilder builder;
 
  DlPaint paint;
  paint.setColor(DlColor::ARGB(1, 0.1, 0.1, 0.1));
  builder.DrawPaint(paint);
  builder.Scale(0.5, 0.5);
 
  ASSERT_TRUE(RenderTextInCanvasSkia(
      GetContext(), builder, "the quick brown fox jumped over the lazy dog!.?",
      "Roboto-Regular.ttf"));
  ASSERT_TRUE(OpenPlaygroundHere(builder.Build()));
}
 
// This is a test that looks for glyph artifacts we've see.
TEST_P(AiksTest, ScaledK) {
  DisplayListBuilder builder;
  DlPaint paint;
  paint.setColor(DlColor::ARGB(1, 0.1, 0.1, 0.1));
  builder.DrawPaint(paint);
  for (int i = 0; i < 6; ++i) {
    builder.Save();
    builder.Translate(300 * i, 0);
    Scalar scale = 0.445 - (i / 1000.f);
    builder.Scale(scale, scale);
    RenderTextInCanvasSkia(
        GetContext(), builder, "k", "Roboto-Regular.ttf",
        TextRenderOptions{.font_size = 600, .position = DlPoint(10, 500)});
    RenderTextInCanvasSkia(
        GetContext(), builder, "k", "Roboto-Regular.ttf",
        TextRenderOptions{.font_size = 300, .position = DlPoint(10, 800)});
    builder.Restore();
  }
  ASSERT_TRUE(OpenPlaygroundHere(builder.Build()));
}
 
// This is a test that looks for glyph artifacts we've see.
TEST_P(AiksTest, MassiveScaleConvertToPath) {
  Scalar scale = 16.0;
  auto callback = [&]() -> sk_sp<DisplayList> {
    if (IsPlaygroundEnabled()) {
      ImGui::Begin("Controls", nullptr, ImGuiWindowFlags_AlwaysAutoResize);
      ImGui::SliderFloat("Scale", &scale, 4, 20);
      ImGui::End();
    }
 
    DisplayListBuilder builder;
    DlPaint paint;
    paint.setColor(DlColor::ARGB(1, 0.1, 0.1, 0.1));
    builder.DrawPaint(paint);
 
    builder.Scale(scale, scale);
    RenderTextInCanvasSkia(
        GetContext(), builder, "HELLO", "Roboto-Regular.ttf",
        TextRenderOptions{.font_size = 16,
                          .color = (16 * scale >= 250) ? DlColor::kYellow()
                                                       : DlColor::kOrange(),
                          .position = DlPoint(0, 20)});
    return builder.Build();
  };
 
  ASSERT_TRUE(OpenPlaygroundHere(callback));
}
 
TEST_P(AiksTest, CanRenderTextFrameWithScalingOverflow) {
  Scalar scale = 60.0;
  Scalar offsetx = -500.0;
  Scalar offsety = 700.0;
  auto callback = [&]() -> sk_sp<DisplayList> {
    if (IsPlaygroundEnabled()) {
      ImGui::Begin("Controls", nullptr, ImGuiWindowFlags_AlwaysAutoResize);
      ImGui::SliderFloat("scale", &scale, 1.f, 300.f);
      ImGui::SliderFloat("offsetx", &offsetx, -600.f, 100.f);
      ImGui::SliderFloat("offsety", &offsety, 600.f, 2048.f);
      ImGui::End();
    }
    DisplayListBuilder builder;
    builder.Scale(GetContentScale().x, GetContentScale().y);
    DlPaint paint;
    paint.setColor(DlColor::ARGB(1, 0.1, 0.1, 0.1));
    builder.DrawPaint(paint);
    builder.Scale(scale, scale);
 
    RenderTextInCanvasSkia(
        GetContext(), builder, "test", "Roboto-Regular.ttf",
        TextRenderOptions{
            .position = DlPoint(offsetx / scale, offsety / scale),
        });
    return builder.Build();
  };
  ASSERT_TRUE(OpenPlaygroundHere(callback));
}
 
TEST_P(AiksTest, CanRenderTextFrameWithFractionScaling) {
  Scalar fine_scale = 0.f;
  bool is_subpixel = false;
  auto callback = [&]() -> sk_sp<DisplayList> {
    if (IsPlaygroundEnabled()) {
      ImGui::Begin("Controls", nullptr, ImGuiWindowFlags_AlwaysAutoResize);
      ImGui::SliderFloat("Fine Scale", &fine_scale, -1, 1);
      ImGui::Checkbox("subpixel", &is_subpixel);
      ImGui::End();
    }
 
    DisplayListBuilder builder;
    DlPaint paint;
    paint.setColor(DlColor::ARGB(1, 0.1, 0.1, 0.1));
    builder.DrawPaint(paint);
    Scalar scale = 2.625 + fine_scale;
    builder.Scale(scale, scale);
    RenderTextInCanvasSkia(GetContext(), builder,
                           "the quick brown fox jumped over the lazy dog!.?",
                           "Roboto-Regular.ttf",
                           TextRenderOptions{.is_subpixel = is_subpixel});
    return builder.Build();
  };
 
  ASSERT_TRUE(OpenPlaygroundHere(callback));
}
 
// https://github.com/flutter/flutter/issues/164958
TEST_P(AiksTest, TextRotated180Degrees) {
  float fpivot[2] = {200 + 30, 200 - 20};
  float rotation = 180;
  float foffset[2] = {200, 200};
 
  auto callback = [&]() -> sk_sp<DisplayList> {
    if (IsPlaygroundEnabled()) {
      ImGui::Begin("Controls", nullptr, ImGuiWindowFlags_AlwaysAutoResize);
      ImGui::SliderFloat("pivotx", &fpivot[0], 0, 300);
      ImGui::SliderFloat("pivoty", &fpivot[1], 0, 300);
      ImGui::SliderFloat("rotation", &rotation, 0, 360);
      ImGui::SliderFloat("foffsetx", &foffset[0], 0, 300);
      ImGui::SliderFloat("foffsety", &foffset[1], 0, 300);
      ImGui::End();
    }
    DisplayListBuilder builder;
    builder.Scale(GetContentScale().x, GetContentScale().y);
    builder.DrawPaint(DlPaint().setColor(DlColor(0xffffeeff)));
 
    builder.Save();
    DlPoint pivot = Point(fpivot[0], fpivot[1]);
    builder.Translate(pivot.x, pivot.y);
    builder.Rotate(rotation);
    builder.Translate(-pivot.x, -pivot.y);
 
    RenderTextInCanvasSkia(GetContext(), builder, "test", "Roboto-Regular.ttf",
                           TextRenderOptions{
                               .color = DlColor::kBlack(),
                               .position = DlPoint(foffset[0], foffset[1]),
                           });
 
    builder.Restore();
    return builder.Build();
  };
  ASSERT_TRUE(OpenPlaygroundHere(callback));
}
 
TEST_P(AiksTest, TextFrameSubpixelAlignment) {
  // "Random" numbers between 0 and 1. Hardcoded to avoid flakiness in goldens.
  std::array<Scalar, 20> phase_offsets = {
      7.82637e-06, 0.131538,  0.755605,   0.45865,   0.532767,
      0.218959,    0.0470446, 0.678865,   0.679296,  0.934693,
      0.383502,    0.519416,  0.830965,   0.0345721, 0.0534616,
      0.5297,      0.671149,  0.00769819, 0.383416,  0.0668422};
  auto callback = [&]() -> sk_sp<DisplayList> {
    static float font_size = 20;
    static float phase_variation = 0.2;
    static float speed = 0.5;
    static float magnitude = 100;
    if (IsPlaygroundEnabled()) {
      ImGui::Begin("Controls", nullptr, ImGuiWindowFlags_AlwaysAutoResize);
      ImGui::SliderFloat("Font size", &font_size, 5, 50);
      ImGui::SliderFloat("Phase variation", &phase_variation, 0, 1);
      ImGui::SliderFloat("Oscillation speed", &speed, 0, 2);
      ImGui::SliderFloat("Oscillation magnitude", &magnitude, 0, 300);
      ImGui::End();
    }
 
    DisplayListBuilder builder;
    builder.Scale(GetContentScale().x, GetContentScale().y);
 
    for (size_t i = 0; i < phase_offsets.size(); i++) {
      DlPoint position = DlPoint(
          200 +
              magnitude * std::sin((-phase_offsets[i] * k2Pi * phase_variation +
                                    GetSecondsElapsed() * speed)),  //
          200 + i * font_size * 1.1                                 //
      );
      if (!RenderTextInCanvasSkia(
              GetContext(), builder,
              "the quick brown fox jumped over "
              "the lazy dog!.?",
              "Roboto-Regular.ttf",
              {.font_size = font_size, .position = position})) {
        return nullptr;
      }
    }
    return builder.Build();
  };
 
  ASSERT_TRUE(OpenPlaygroundHere(callback));
}
 
TEST_P(AiksTest, CanRenderItalicizedText) {
  DisplayListBuilder builder;
 
  DlPaint paint;
  paint.setColor(DlColor::ARGB(1, 0.1, 0.1, 0.1));
  builder.DrawPaint(paint);
 
  ASSERT_TRUE(RenderTextInCanvasSkia(
      GetContext(), builder, "the quick brown fox jumped over the lazy dog!.?",
      "HomemadeApple.ttf"));
  ASSERT_TRUE(OpenPlaygroundHere(builder.Build()));
}
 
static constexpr std::string_view kFontFixture =
#if FML_OS_MACOSX
    "Apple Color Emoji.ttc";
#else
    "NotoColorEmoji.ttf";
#endif
 
TEST_P(AiksTest, CanRenderEmojiTextFrame) {
  DisplayListBuilder builder;
 
  DlPaint paint;
  paint.setColor(DlColor::ARGB(1, 0.1, 0.1, 0.1));
  builder.DrawPaint(paint);
 
  ASSERT_TRUE(RenderTextInCanvasSkia(
      GetContext(), builder, "😀 😃 😄 😁 😆 😅 😂 🤣 🥲 😊", kFontFixture));
  ASSERT_TRUE(OpenPlaygroundHere(builder.Build()));
}
 
TEST_P(AiksTest, CanRenderEmojiTextFrameWithBlur) {
  DisplayListBuilder builder;
 
  builder.Scale(GetContentScale().x, GetContentScale().y);
  DlPaint paint;
  paint.setColor(DlColor::ARGB(1, 0.1, 0.1, 0.1));
  builder.DrawPaint(paint);
 
  ASSERT_TRUE(RenderTextInCanvasSkia(
      GetContext(), builder, "😀 😃 😄 😁 😆 😅 😂 🤣 🥲 😊", kFontFixture,
      TextRenderOptions{
          .color = DlColor::kBlue(),
          .filter = DlBlurMaskFilter::Make(DlBlurStyle::kNormal, 4)}));
  ASSERT_TRUE(OpenPlaygroundHere(builder.Build()));
}
 
TEST_P(AiksTest, CanRenderEmojiTextFrameWithAlpha) {
  DisplayListBuilder builder;
 
  DlPaint paint;
  paint.setColor(DlColor::ARGB(1, 0.1, 0.1, 0.1));
  builder.DrawPaint(paint);
 
  ASSERT_TRUE(RenderTextInCanvasSkia(
      GetContext(), builder, "😀 😃 😄 😁 😆 😅 😂 🤣 🥲 😊", kFontFixture,
      {.color = DlColor::kBlack().modulateOpacity(0.5)}));
  ASSERT_TRUE(OpenPlaygroundHere(builder.Build()));
}
 
TEST_P(AiksTest, CanRenderTextInSaveLayer) {
  DisplayListBuilder builder;
 
  DlPaint paint;
  paint.setColor(DlColor::ARGB(0.1, 0.1, 0.1, 0.1));
  builder.DrawPaint(paint);
 
  builder.Translate(100, 100);
  builder.Scale(0.5, 0.5);
 
  // Blend the layer with the parent pass using kClear to expose the coverage.
  paint.setBlendMode(DlBlendMode::kClear);
  builder.SaveLayer(std::nullopt, &paint);
  ASSERT_TRUE(RenderTextInCanvasSkia(
      GetContext(), builder, "the quick brown fox jumped over the lazy dog!.?",
      "Roboto-Regular.ttf"));
  builder.Restore();
 
  // Render the text again over the cleared coverage rect.
  ASSERT_TRUE(RenderTextInCanvasSkia(
      GetContext(), builder, "the quick brown fox jumped over the lazy dog!.?",
      "Roboto-Regular.ttf"));
 
  ASSERT_TRUE(OpenPlaygroundHere(builder.Build()));
}
 
TEST_P(AiksTest, CanRenderTextOutsideBoundaries) {
  DisplayListBuilder builder;
  builder.Translate(200, 150);
 
  // Construct the text blob.
  auto mapping = flutter::testing::OpenFixtureAsSkData("wtf.otf");
  ASSERT_NE(mapping, nullptr);
 
  Scalar font_size = 80;
  sk_sp<SkFontMgr> font_mgr = txt::GetDefaultFontManager();
  SkFont sk_font(font_mgr->makeFromData(mapping), font_size);
 
  DlPaint text_paint;
  text_paint.setColor(DlColor::kBlue().withAlpha(255 * 0.8));
 
  struct {
    DlPoint position;
    const char* text;
  } text[] = {{DlPoint(0, 0), "0F0F0F0"},
              {DlPoint(1, 2), "789"},
              {DlPoint(1, 3), "456"},
              {DlPoint(1, 4), "123"},
              {DlPoint(0, 6), "0F0F0F0"}};
  for (auto& t : text) {
    builder.Save();
    builder.Translate(t.position.x * font_size * 2,
                      t.position.y * font_size * 1.1);
    {
      auto blob = SkTextBlob::MakeFromString(t.text, sk_font);
      ASSERT_NE(blob, nullptr);
      auto frame = MakeTextFrameFromTextBlobSkia(blob);
      builder.DrawText(DlTextImpeller::Make(frame), 0, 0, text_paint);
    }
    builder.Restore();
  }
 
  ASSERT_TRUE(OpenPlaygroundHere(builder.Build()));
}
 
TEST_P(AiksTest, TextRotated) {
  // This test used to be intentionally excluded for impeller_golden_tests
  // but when the SDF backend variants were added, the explicit exclusions
  // for those backends were not added to the exclusion list. So it has
  // actually been running just fine for a while now generating goldens
  // for the SDF backends.
  // We will let it run on all backends now in the playground-based golden
  // mechanism as the underlying flakiness may have been resolved since the
  // exclusion was added.
  // https://github.com/flutter/flutter/blame/ad80825c24d770a19e33f67800fc0338a3b89ec7/engine/src/flutter/impeller/golden_tests/golden_playground_test_mac.cc#L107
 
  DisplayListBuilder builder;
 
  builder.Scale(GetContentScale().x, GetContentScale().y);
  DlPaint paint;
  paint.setColor(DlColor::ARGB(0.1, 0.1, 0.1, 1.0));
  builder.DrawPaint(paint);
 
  builder.Transform(Matrix(0.25, -0.3, 0, -0.002,  //
                           0, 0.5, 0, 0,           //
                           0, 0, 0.3, 0,           //
                           100, 100, 0, 1.3));
  ASSERT_TRUE(RenderTextInCanvasSkia(
      GetContext(), builder, "the quick brown fox jumped over the lazy dog!.?",
      "Roboto-Regular.ttf"));
 
  ASSERT_TRUE(OpenPlaygroundHere(builder.Build()));
}
 
TEST_P(AiksTest, DrawScaledTextWithPerspectiveNoSaveLayer) {
  DisplayListBuilder builder;
 
  Matrix matrix = Matrix(1.0, 0.0, 0.0, 0.0,    //
                         0.0, 1.0, 0.0, 0.0,    //
                         0.0, 0.0, 1.0, 0.01,   //
                         0.0, 0.0, 0.0, 1.0) *  //
                  Matrix::MakeRotationY({Degrees{10}});
 
  builder.Transform(matrix);
 
  ASSERT_TRUE(RenderTextInCanvasSkia(GetContext(), builder, "Hello world",
                                     "Roboto-Regular.ttf"));
  ASSERT_TRUE(OpenPlaygroundHere(builder.Build()));
}
 
TEST_P(AiksTest, DrawScaledTextWithPerspectiveSaveLayer) {
  DisplayListBuilder builder;
 
  Matrix matrix = Matrix(1.0, 0.0, 0.0, 0.0,    //
                         0.0, 1.0, 0.0, 0.0,    //
                         0.0, 0.0, 1.0, 0.01,   //
                         0.0, 0.0, 0.0, 1.0) *  //
                  Matrix::MakeRotationY({Degrees{10}});
 
  DlPaint save_paint;
  DlRect window_bounds =
      DlRect::MakeXYWH(0, 0, GetWindowSize().width, GetWindowSize().height);
  // Note: bounds were not needed by the AIKS version, which may indicate a bug.
  builder.SaveLayer(window_bounds, &save_paint);
  builder.Transform(matrix);
 
  ASSERT_TRUE(RenderTextInCanvasSkia(GetContext(), builder, "Hello world",
                                     "Roboto-Regular.ttf"));
 
  builder.Restore();
  ASSERT_TRUE(OpenPlaygroundHere(builder.Build()));
}
 
TEST_P(AiksTest, CanRenderTextWithLargePerspectiveTransform) {
  // Verifies that text scales are clamped to work around
  // https://github.com/flutter/flutter/issues/136112 .
 
  DisplayListBuilder builder;
 
  DlPaint save_paint;
  builder.SaveLayer(std::nullopt, &save_paint);
  builder.Transform(Matrix(2000, 0, 0, 0,   //
                           0, 2000, 0, 0,   //
                           0, 0, -1, 9000,  //
                           0, 0, -1, 7000   //
                           ));
 
  ASSERT_TRUE(RenderTextInCanvasSkia(GetContext(), builder, "Hello world",
                                     "Roboto-Regular.ttf"));
  ASSERT_TRUE(OpenPlaygroundHere(builder.Build()));
}
 
TEST_P(AiksTest, CanRenderTextWithPerspectiveTransformInSublist) {
  DisplayListBuilder text_builder;
  ASSERT_TRUE(RenderTextInCanvasSkia(GetContext(), text_builder, "Hello world",
                                     "Roboto-Regular.ttf"));
  auto text_display_list = text_builder.Build();
 
  DisplayListBuilder builder;
 
  Matrix matrix = Matrix::MakeRow(2.0, 0.0, 0.0, 0.0,  //
                                  0.0, 2.0, 0.0, 0.0,  //
                                  0.0, 0.0, 1.0, 0.0,  //
                                  0.0, 0.002, 0.0, 1.0);
 
  DlPaint save_paint;
  DlRect window_bounds =
      DlRect::MakeXYWH(0, 0, GetWindowSize().width, GetWindowSize().height);
  builder.SaveLayer(window_bounds, &save_paint);
  builder.Transform(matrix);
  builder.DrawDisplayList(text_display_list, 1.0f);
  builder.Restore();
 
  ASSERT_TRUE(OpenPlaygroundHere(builder.Build()));
}
 
// This currently renders solid blue, as the support for text color sources was
// moved into DLDispatching. Path data requires the SkTextBlobs which are not
// used in impeller::TextFrames.
TEST_P(AiksTest, TextForegroundShaderWithTransform) {
  auto mapping = flutter::testing::OpenFixtureAsSkData("Roboto-Regular.ttf");
  ASSERT_NE(mapping, nullptr);
 
  Scalar font_size = 100;
  sk_sp<SkFontMgr> font_mgr = txt::GetDefaultFontManager();
  SkFont sk_font(font_mgr->makeFromData(mapping), font_size);
 
  DlPaint text_paint;
  text_paint.setColor(DlColor::kBlue());
 
  std::vector<DlColor> colors = {DlColor::RGBA(0.9568, 0.2627, 0.2118, 1.0),
                                 DlColor::RGBA(0.1294, 0.5882, 0.9529, 1.0)};
  std::vector<Scalar> stops = {
      0.0,
      1.0,
  };
  text_paint.setColorSource(DlColorSource::MakeLinear(
      /*start_point=*/DlPoint(0, 0),     //
      /*end_point=*/DlPoint(100, 100),   //
      /*stop_count=*/2,                  //
      /*colors=*/colors.data(),          //
      /*stops=*/stops.data(),            //
      /*tile_mode=*/DlTileMode::kRepeat  //
      ));
 
  DisplayListBuilder builder;
  builder.Translate(100, 100);
  builder.Rotate(45);
 
  auto blob = SkTextBlob::MakeFromString("Hello", sk_font);
  ASSERT_NE(blob, nullptr);
  auto frame = MakeTextFrameFromTextBlobSkia(blob);
  builder.DrawText(DlTextImpeller::Make(frame), 0, 0, text_paint);
 
  ASSERT_TRUE(OpenPlaygroundHere(builder.Build()));
}
 
// Regression test for https://github.com/flutter/flutter/issues/157885.
TEST_P(AiksTest, DifferenceClipsMustRenderIdenticallyAcrossBackends) {
  DisplayListBuilder builder;
 
  DlPaint paint;
  DlColor clear_color(1.0, 0.5, 0.5, 0.5, DlColorSpace::kSRGB);
  paint.setColor(clear_color);
  builder.DrawPaint(paint);
 
  DlMatrix identity = {
      1.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0,
      0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 1.0,
  };
  builder.Save();
  builder.Transform(identity);
 
  DlRect frame = DlRect::MakeLTRB(1.0, 1.0, 1278.0, 763.0);
  DlColor white(1.0, 1.0, 1.0, 1.0, DlColorSpace::kSRGB);
  paint.setColor(white);
  builder.DrawRect(frame, paint);
 
  builder.Save();
  builder.ClipRect(frame, DlClipOp::kIntersect);
 
  DlMatrix rect_xform = {
      0.8241262, 0.56640625, 0.0, 0.0, -0.56640625, 0.8241262, 0.0, 0.0,
      0.0,       0.0,        1.0, 0.0, 271.1137,    489.4733,  0.0, 1.0,
  };
  builder.Save();
  builder.Transform(rect_xform);
 
  DlRect rect = DlRect::MakeLTRB(0.0, 0.0, 100.0, 100.0);
  DlColor bluish(1.0, 0.184, 0.501, 0.929, DlColorSpace::kSRGB);
  paint.setColor(bluish);
  DlRoundRect rrect = DlRoundRect::MakeRectRadius(rect, 18.0);
  builder.DrawRoundRect(rrect, paint);
 
  builder.Save();
  builder.ClipRect(rect, DlClipOp::kIntersect);
  builder.Restore();
 
  builder.Restore();
 
  DlMatrix path_xform = {
      1.0, 0.0, 0.0, 0.0, 0.0,   1.0,   0.0, 0.0,
      0.0, 0.0, 1.0, 0.0, 675.0, 279.5, 0.0, 1.0,
  };
  builder.Save();
  builder.Transform(path_xform);
 
  DlPathBuilder path_builder;
  path_builder.MoveTo(DlPoint(87.5, 349.5));
  path_builder.LineTo(DlPoint(25.0, 29.5));
  path_builder.LineTo(DlPoint(150.0, 118.0));
  path_builder.LineTo(DlPoint(25.0, 118.0));
  path_builder.LineTo(DlPoint(150.0, 29.5));
  path_builder.Close();
  DlPath path = path_builder.TakePath();
 
  DlColor fill_color(1.0, 1.0, 0.0, 0.0, DlColorSpace::kSRGB);
  DlColor stroke_color(1.0, 0.0, 0.0, 0.0, DlColorSpace::kSRGB);
  paint.setColor(fill_color);
  paint.setDrawStyle(DlDrawStyle::kFill);
  builder.DrawPath(path, paint);
 
  paint.setColor(stroke_color);
  paint.setStrokeWidth(2.0);
  paint.setDrawStyle(DlDrawStyle::kStroke);
  builder.DrawPath(path, paint);
 
  builder.Restore();
  builder.Restore();
  builder.Restore();
 
  ASSERT_TRUE(OpenPlaygroundHere(builder.Build()));
}
 
TEST_P(AiksTest, TextContentsMismatchedTransformTest) {
  AiksContext aiks_context(GetContext(),
                           std::make_shared<TypographerContextSkia>());
 
  // Verifies that TextContents only use the scale/transform that is
  // computed during preroll.
  constexpr const char* font_fixture = "Roboto-Regular.ttf";
 
  // Construct the text blob.
  auto c_font_fixture = std::string(font_fixture);
  auto mapping = flutter::testing::OpenFixtureAsSkData(c_font_fixture.c_str());
  ASSERT_TRUE(mapping);
 
  sk_sp<SkFontMgr> font_mgr = txt::GetDefaultFontManager();
  SkFont sk_font(font_mgr->makeFromData(mapping), 16);
 
  auto blob = SkTextBlob::MakeFromString("Hello World", sk_font);
  ASSERT_TRUE(blob);
 
  auto text_frame = MakeTextFrameFromTextBlobSkia(blob);
 
  // Simulate recording the text frame during preroll.
  Matrix preroll_matrix =
      Matrix::MakeTranslateScale({1.5, 1.5, 1}, {100, 50, 0});
  Point preroll_point = Point{23, 45};
  {
    aiks_context.GetContentContext().GetLazyGlyphAtlas()->AddTextFrame(
        text_frame,        //
        preroll_point,     //
        preroll_matrix,    //
        GlyphProperties{}  //
    );
  }
 
  // Now simulate rendering with a slightly different scale factor.
  RenderTarget render_target =
      aiks_context.GetContentContext()
          .GetRenderTargetCache()
          ->CreateOffscreenMSAA(*aiks_context.GetContext(), {100, 100}, 1);
 
  TextContents text_contents;
  text_contents.SetTextFrame(text_frame);
  text_contents.SetPosition(preroll_point);
  text_contents.SetScreenTransform(preroll_matrix);
  text_contents.SetColor(Color::Aqua());
 
  Matrix not_preroll_matrix =
      preroll_matrix * Matrix::MakeScale({2.0f, 2.0f, 1.0f});
 
  Entity entity;
  entity.SetTransform(not_preroll_matrix);
 
  std::shared_ptr<CommandBuffer> command_buffer =
      aiks_context.GetContext()->CreateCommandBuffer();
  std::shared_ptr<RenderPass> render_pass =
      command_buffer->CreateRenderPass(render_target);
 
  EXPECT_TRUE(text_contents.Render(aiks_context.GetContentContext(), entity,
                                   *render_pass));
}
 
TEST_P(AiksTest, CanRenderTextFrameWithThinLightAndDarkColors) {
  DisplayListBuilder builder;
  DlPaint paint;
  paint.setColor(DlColor::ARGB(1, 0.1, 0.1, 0.1));
  builder.DrawPaint(paint);
 
  auto mapping =
      flutter::testing::OpenFixtureAsSkData("RobotoSlab-VariableFont_wght.ttf");
  ASSERT_TRUE(mapping);
  sk_sp<SkFontMgr> font_mgr = txt::GetDefaultFontManager();
 
  // Set the variation axis for weight to 100 (typically "Thin").
  SkFontArguments::VariationPosition::Coordinate weight_coord{
      SkSetFourByteTag('w', 'g', 'h', 't'), 100.0f};
  SkFontArguments args;
  args.setVariationDesignPosition({&weight_coord, 1});
 
  SkFont thin_font(font_mgr->makeFromData(mapping)->makeClone(args), 25);
 
  // Render light text
  ASSERT_TRUE(RenderTextInCanvasSkia(
      GetContext(), builder, "the quick brown fox jumped over the lazy dog!.?",
      "RobotoSlab-VariableFont_wght.ttf",
      TextRenderOptions{.color = DlColor::kWhite(),
                        .position = DlPoint(100, 200)},
      thin_font));
 
  // Render dark text on a light background
  DlPaint dart_text_background_paint;
  dart_text_background_paint.setColor(DlColor::ARGB(1, 0.9, 0.9, 0.9));
  builder.DrawRect(DlRect::MakeXYWH(50, 250, 900, 100),
                   dart_text_background_paint);
  ASSERT_TRUE(RenderTextInCanvasSkia(
      GetContext(), builder, "the quick brown fox jumped over the lazy dog!.?",
      "RobotoSlab-VariableFont_wght.ttf",
      TextRenderOptions{.color = DlColor::kDarkGreen(),
                        .position = DlPoint(100, 300)},
      thin_font));
 
  ASSERT_TRUE(OpenPlaygroundHere(builder.Build()));
}
 
TEST_P(AiksTest, TextWithShadowCache) {
  DisplayListBuilder builder;
  builder.Scale(GetContentScale().x, GetContentScale().y);
  DlPaint paint;
  paint.setColor(DlColor::ARGB(1, 0.1, 0.1, 0.1));
  builder.DrawPaint(paint);
 
  AiksContext aiks_context(GetContext(),
                           std::make_shared<TypographerContextSkia>());
  // Cache empty
  EXPECT_EQ(aiks_context.GetContentContext()
                .GetTextShadowCache()
                .GetCacheSizeForTesting(),
            0u);
 
  ASSERT_TRUE(RenderTextInCanvasSkia(
      GetContext(), builder, "Hello World", kFontFixture,
      TextRenderOptions{
          .color = DlColor::kBlue(),
          .filter = DlBlurMaskFilter::Make(DlBlurStyle::kNormal, 4)}));
 
  DisplayListToTexture(builder.Build(), {400, 400}, aiks_context);
 
  // Text should be cached.
  EXPECT_EQ(aiks_context.GetContentContext()
                .GetTextShadowCache()
                .GetCacheSizeForTesting(),
            1u);
}
 
TEST_P(AiksTest, MultipleTextWithShadowCache) {
  DisplayListBuilder builder;
  builder.Scale(GetContentScale().x, GetContentScale().y);
  DlPaint paint;
  paint.setColor(DlColor::ARGB(1, 0.1, 0.1, 0.1));
  builder.DrawPaint(paint);
 
  AiksContext aiks_context(GetContext(),
                           std::make_shared<TypographerContextSkia>());
  // Cache empty
  EXPECT_EQ(aiks_context.GetContentContext()
                .GetTextShadowCache()
                .GetCacheSizeForTesting(),
            0u);
 
  for (auto i = 0; i < 5; i++) {
    ASSERT_TRUE(RenderTextInCanvasSkia(
        GetContext(), builder, "Hello World", kFontFixture,
        TextRenderOptions{
            .color = DlColor::kBlue(),
            .filter = DlBlurMaskFilter::Make(DlBlurStyle::kNormal, 4)}));
  }
 
  DisplayListToTexture(builder.Build(), {400, 400}, aiks_context);
 
  // Text should be cached. Each text gets its own entry as we don't analyze the
  // strings.
  EXPECT_EQ(aiks_context.GetContentContext()
                .GetTextShadowCache()
                .GetCacheSizeForTesting(),
            5u);
}
 
TEST_P(AiksTest, MultipleColorWithShadowCache) {
  DisplayListBuilder builder;
  builder.Scale(GetContentScale().x, GetContentScale().y);
  DlPaint paint;
  paint.setColor(DlColor::kWhite());
  builder.DrawPaint(paint);
 
  AiksContext aiks_context(GetContext(),
                           std::make_shared<TypographerContextSkia>());
  // Cache empty
  EXPECT_EQ(aiks_context.GetContentContext()
                .GetTextShadowCache()
                .GetCacheSizeForTesting(),
            0u);
 
  SkFont sk_font = flutter::testing::CreateTestFontOfSize(12);
 
  std::array<DlColor, 4> colors{DlColor::kRed(), DlColor::kGreen(),
                                DlColor::kBlue(), DlColor::kRed()};
  for (const auto& color : colors) {
    ASSERT_TRUE(RenderTextInCanvasSkia(
        GetContext(), builder, "A", kFontFixture,
        TextRenderOptions{
            .color = color,
            .filter = DlBlurMaskFilter::Make(DlBlurStyle::kNormal, 4)},
        sk_font));
  }
 
  DisplayListToTexture(builder.Build(), {400, 400}, aiks_context);
 
  // The count of cache entries should match the number of distinct colors
  // in the list.  Repeated usage of a color should not add to the cache.
  EXPECT_EQ(aiks_context.GetContentContext()
                .GetTextShadowCache()
                .GetCacheSizeForTesting(),
            3u);
}
 
TEST_P(AiksTest, SingleIconShadowTest) {
  DisplayListBuilder builder;
  builder.Scale(GetContentScale().x, GetContentScale().y);
  DlPaint paint;
  paint.setColor(DlColor::ARGB(1, 0.1, 0.1, 0.1));
  builder.DrawPaint(paint);
 
  AiksContext aiks_context(GetContext(),
                           std::make_shared<TypographerContextSkia>());
  // Cache empty
  EXPECT_EQ(aiks_context.GetContentContext()
                .GetTextShadowCache()
                .GetCacheSizeForTesting(),
            0u);
 
  // Create font instance outside loop so all draws use identical font instance.
  auto c_font_fixture = std::string(kFontFixture);
  auto mapping = flutter::testing::OpenFixtureAsSkData(c_font_fixture.c_str());
  ASSERT_TRUE(mapping);
  sk_sp<SkFontMgr> font_mgr = txt::GetDefaultFontManager();
  SkFont sk_font(font_mgr->makeFromData(mapping), 50);
 
  for (auto i = 0; i < 10; i++) {
    ASSERT_TRUE(RenderTextInCanvasSkia(
        GetContext(), builder, "A", kFontFixture,
        TextRenderOptions{
            .color = DlColor::kBlue(),
            .filter = DlBlurMaskFilter::Make(DlBlurStyle::kNormal, 4)},
        sk_font));
  }
 
  DisplayListToTexture(builder.Build(), {400, 400}, aiks_context);
 
  // Text should be cached. All 10 glyphs use the same cache entry.
  EXPECT_EQ(aiks_context.GetContentContext()
                .GetTextShadowCache()
                .GetCacheSizeForTesting(),
            1u);
}
 
TEST_P(AiksTest, VarietyOfTextScalesShowingRasterAndPath) {
  DisplayListBuilder builder;
  DlPaint paint;
  paint.setColor(DlColor::ARGB(1, 0.1, 0.1, 0.1));
  builder.DrawPaint(paint);
  builder.Scale(GetContentScale().x, GetContentScale().y);
 
  std::vector<Scalar> scales = {4, 8, 16, 24, 32};
  std::vector<Scalar> spacing = {8, 8, 8, 8, 8};
  Scalar space = 16;
  Scalar x = 0;
  for (auto i = 0u; i < scales.size(); i++) {
    builder.Save();
    builder.Scale(scales[i], scales[i]);
    RenderTextInCanvasSkia(
        GetContext(), builder, "lo", "Roboto-Regular.ttf",
        TextRenderOptions{.font_size = 16, .position = DlPoint(x, space)});
    space += spacing[i];
    if (i == 3) {
      x = 10;
      space = 16;
    }
    builder.Restore();
  }
  ASSERT_TRUE(OpenPlaygroundHere(builder.Build()));
}
 
namespace {
std::shared_ptr<TextFrame> MakeDefaultTextFrame(const std::string& text,
                                                Scalar font_size) {
  // Construct the text blob.
  auto mapping = flutter::testing::OpenFixtureAsSkData("Roboto-Regular.ttf");
  if (mapping == nullptr) {
    return nullptr;
  }
 
  sk_sp<SkFontMgr> font_mgr = txt::GetDefaultFontManager();
  SkFont sk_font(font_mgr->makeFromData(mapping), font_size);
  sk_sp<SkTextBlob> blob = SkTextBlob::MakeFromString("Hi", sk_font);
 
  std::shared_ptr<TextFrame> text_frame = MakeTextFrameFromTextBlobSkia(blob);
  return text_frame;
}
 
void DrawTextFramesMultipleScalesWithReuse(AiksTest* test,
                                           Scalar first_scale,
                                           Scalar second_scale) {
  DisplayListBuilder builder;
  builder.Scale(test->GetContentScale().x, test->GetContentScale().y);
  builder.DrawColor(DlColor::kWhite(), DlBlendMode::kSrc);
 
  std::shared_ptr<TextFrame> reuse_frame = MakeDefaultTextFrame("Hi", 20.0f);
  ASSERT_NE(reuse_frame, nullptr);
 
  builder.Save();
  builder.Translate(100, 100);
  builder.Scale(first_scale, first_scale);
  builder.DrawText(DlTextImpeller::Make(reuse_frame), 0, 0,
                   DlPaint(DlColor::kBlue()));
  builder.Restore();
 
  builder.Save();
  builder.Translate(400, 100);
  builder.Scale(second_scale, second_scale);
  builder.DrawText(DlTextImpeller::Make(reuse_frame), 0, 0,
                   DlPaint(DlColor::kPurple()));
  builder.Restore();
 
  builder.Save();
  builder.Translate(100, 400);
  builder.Scale(first_scale, first_scale);
  std::shared_ptr<TextFrame> single_use_frame1 =
      MakeDefaultTextFrame("Hi", 20.0f);
  builder.DrawText(DlTextImpeller::Make(single_use_frame1), 0, 0,
                   DlPaint(DlColor::kBlue()));
  builder.Restore();
 
  builder.Save();
  builder.Translate(400, 400);
  builder.Scale(second_scale, second_scale);
  std::shared_ptr<TextFrame> single_use_frame2 =
      MakeDefaultTextFrame("Hi", 20.0f);
  builder.DrawText(DlTextImpeller::Make(single_use_frame2), 0, 0,
                   DlPaint(DlColor::kPurple()));
  builder.Restore();
 
  ASSERT_TRUE(test->OpenPlaygroundHere(builder.Build()));
}
}  // namespace
 
TEST_P(AiksTest, TextFramesDoNotShareRenderDataBigSmall) {
  DrawTextFramesMultipleScalesWithReuse(this,                  //
                                        /*first_scale=*/4.0f,  //
                                        /*second_scale=*/0.5f);
}
 
TEST_P(AiksTest, TextFramesDoNotShareRenderDataSmallBig) {
  DrawTextFramesMultipleScalesWithReuse(this,                  //
                                        /*first_scale=*/0.5f,  //
                                        /*second_scale=*/4.0f);
}
 
// Verifies that non-uniform (anisotropic) scaling uses bilinear filtering
// to avoid jagged/aliased text, while uniform scaling remains pixel-perfect.
// Regression test for https://github.com/flutter/flutter/issues/182143
TEST_P(AiksTest, TextWithNonUniformScale) {
  DisplayListBuilder builder;
 
  DlPaint paint;
  paint.setColor(DlColor::ARGB(1, 0.1, 0.1, 0.1));
  builder.DrawPaint(paint);
 
  // Row 1: Uniform scale (should use nearest-neighbor, pixel-perfect).
  builder.Save();
  builder.Scale(2, 2);
  ASSERT_TRUE(RenderTextInCanvasSkia(
      GetContext(), builder, "Uniform 2x2", "Roboto-Regular.ttf",
      TextRenderOptions{.font_size = 30, .position = DlPoint(20, 40)}));
  builder.Restore();
 
  // Row 2: Non-uniform scale Y-only (ratio 2.0, triggers bilinear).
  builder.Save();
  builder.Scale(1, 2);
  ASSERT_TRUE(RenderTextInCanvasSkia(
      GetContext(), builder, "ScaleY 1x2", "Roboto-Regular.ttf",
      TextRenderOptions{.font_size = 30, .position = DlPoint(20, 140)}));
  builder.Restore();
 
  // Row 3: Non-uniform scale X-only (ratio 3.0, triggers bilinear).
  builder.Save();
  builder.Scale(3, 1);
  ASSERT_TRUE(RenderTextInCanvasSkia(
      GetContext(), builder, "ScaleX 3x1", "Roboto-Regular.ttf",
      TextRenderOptions{.font_size = 30, .position = DlPoint(20, 300)}));
  builder.Restore();
 
  // Row 4: Slightly non-uniform (ratio 1.1, below threshold, nearest).
  builder.Save();
  builder.Scale(2, 2.2);
  ASSERT_TRUE(RenderTextInCanvasSkia(
      GetContext(), builder, "Near-uniform 2x2.2", "Roboto-Regular.ttf",
      TextRenderOptions{.font_size = 30, .position = DlPoint(20, 200)}));
  builder.Restore();
 
  ASSERT_TRUE(OpenPlaygroundHere(builder.Build()));
}
 
TEST_P(AiksTest, TextGammaCorrectionGoldenTest) {
  constexpr const char* font_fixture = "Roboto-Regular.ttf";
  auto c_font_fixture = std::string(font_fixture);
  auto mapping = flutter::testing::OpenFixtureAsSkData(c_font_fixture.c_str());
  ASSERT_TRUE(mapping);
 
  sk_sp<SkFontMgr> font_mgr = txt::GetDefaultFontManager();
  SkFont sk_font(/*typeface=*/font_mgr->makeFromData(mapping), /*size=*/60);
  sk_font.setSubpixel(true);
 
  auto blob_corrected =
      SkTextBlob::MakeFromString("Gamma Corrected (true)", sk_font);
  ASSERT_TRUE(blob_corrected);
  auto text_frame_corrected = MakeTextFrameFromTextBlobSkia(blob_corrected);
  text_frame_corrected->SetEnableGammaCorrection(true);
 
  auto blob_uncorrected =
      SkTextBlob::MakeFromString("Gamma Corrected (false)", sk_font);
  ASSERT_TRUE(blob_uncorrected);
  auto text_frame_uncorrected = MakeTextFrameFromTextBlobSkia(blob_uncorrected);
  text_frame_uncorrected->SetEnableGammaCorrection(false);
 
  auto callback = [&]() -> sk_sp<flutter::DisplayList> {
    DisplayListBuilder builder;
 
    DlPaint bg_paint;
    bg_paint.setColor(DlColor::ARGB(1.0, 0.1, 0.1, 0.1));
    builder.DrawPaint(bg_paint);
 
    DlPaint text_paint;
    text_paint.setColor(DlColor::kWhite());
 
    builder.DrawText(/*text=*/DlTextImpeller::Make(text_frame_corrected),
                     /*x=*/50, /*y=*/100, /*paint=*/text_paint);
    builder.DrawText(/*text=*/DlTextImpeller::Make(text_frame_uncorrected),
                     /*x=*/50, /*y=*/200, /*paint=*/text_paint);
 
    builder.DrawText(/*text=*/DlTextImpeller::Make(text_frame_corrected),
                     /*x=*/50, /*y=*/300, /*paint=*/text_paint);
    DlPaint diff_paint = text_paint;
    diff_paint.setBlendMode(DlBlendMode::kDifference);
    builder.DrawText(/*text=*/DlTextImpeller::Make(text_frame_uncorrected),
                     /*x=*/50, /*y=*/300, /*paint=*/diff_paint);
 
    return builder.Build();
  };
 
  ASSERT_TRUE(OpenPlaygroundHere(callback));
}
 
TEST_P(AiksTest, TextWithShadowAndPosition) {
  DisplayListBuilder builder;
  builder.Scale(GetContentScale().x, GetContentScale().y);
  builder.Clear(DlColor::kWhite());
 
  auto frame = MakeDefaultTextFrame("Hello", 25.0f);
  auto text = DlTextImpeller::Make(frame);
  DlPaint paint = DlPaint().setColor(DlColor::kMagenta());
  DlPaint shadow_paint_ctm = DlPaint().setMaskFilter(
      DlBlurMaskFilter::Make(DlBlurStyle::kNormal, 5.0f, true));
  DlPaint shadow_paint_no_ctm = DlPaint().setMaskFilter(
      DlBlurMaskFilter::Make(DlBlurStyle::kNormal, 5.0f, false));
 
  builder.Translate(100, 100);
  builder.Scale(4, 4);
  for (int x = 10; x <= 100; x += 30) {
    builder.DrawText(text, x, 20, shadow_paint_ctm);
    builder.DrawText(text, x, 20, paint);
 
    builder.DrawText(text, x, 50, shadow_paint_no_ctm);
    builder.DrawText(text, x, 50, paint);
  }
 
  ASSERT_TRUE(OpenPlaygroundHere(builder.Build()));
}
 
}  // namespace testing
}  // namespace impeller