Update DisplayList tests to explicitly select the Roboto font (flutter/engine#47493)

Skia is removing the API for constructing a default typeface (see https://issues.skia.org/issues/305780908)

Fixes https://github.com/flutter/flutter/issues/137565

engine/src/flutter/display_list/BUILD.gn

@@ -96,11 +96,12 @@ source_set("display_list") {
   }
 }
 
-if (enable_unittests) {
-  test_fixtures("display_list_fixtures") {
-    fixtures = []
-  }
+test_fixtures("display_list_fixtures") {
+  fixtures =
+      [ "//flutter/third_party/txt/third_party/fonts/Roboto-Regular.ttf" ]
+}
 
+if (enable_unittests) {
   executable("display_list_unittests") {
     testonly = true
 
@@ -201,10 +202,6 @@ if (enable_unittests) {
   }
 }
 
-fixtures_location("display_list_benchmarks_fixtures") {
-  assets_dir = "$target_gen_dir/"
-}
-
 source_set("display_list_benchmarks_source") {
   testonly = true
 
@@ -215,10 +212,11 @@ source_set("display_list_benchmarks_source") {
 
   deps = [
     ":display_list",
-    ":display_list_benchmarks_fixtures",
+    ":display_list_fixtures",
     "//flutter/benchmarking",
     "//flutter/common/graphics",
     "//flutter/display_list/testing:display_list_surface_provider",
+    "//flutter/display_list/testing:display_list_testing",
     "//flutter/fml",
     "//flutter/testing:skia",
     "//flutter/testing:testing_lib",

engine/src/flutter/display_list/benchmarking/dl_benchmarks.cc

@@ -6,6 +6,7 @@
 #include "flutter/display_list/dl_builder.h"
 #include "flutter/display_list/dl_op_flags.h"
 #include "flutter/display_list/skia/dl_sk_canvas.h"
+#include "flutter/display_list/testing/dl_test_snippets.h"
 
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "third_party/skia/include/core/SkImage.h"
@@ -1203,7 +1204,7 @@ void BM_DrawTextBlob(benchmark::State& state,
 
   for (size_t i = 0; i < draw_calls; i++) {
     character[0] = 'A' + (i % 26);
-    auto blob = SkTextBlob::MakeFromString(character, SkFont());
+    auto blob = SkTextBlob::MakeFromString(character, CreateTestFontOfSize(20));
     builder.DrawTextBlob(blob, 50.0f, 50.0f, paint);
   }
 

engine/src/flutter/display_list/benchmarking/dl_complexity_unittests.cc

@@ -306,7 +306,7 @@ TEST(DisplayListComplexity, DrawVertices) {
 
 TEST(DisplayListComplexity, DrawTextBlob) {
   auto text_blob = SkTextBlob::MakeFromString(
-      "The quick brown fox jumps over the lazy dog.", SkFont());
+      "The quick brown fox jumps over the lazy dog.", CreateTestFontOfSize(20));
 
   DisplayListBuilder builder;
   builder.DrawTextBlob(text_blob, 0.0f, 0.0f, DlPaint());

engine/src/flutter/display_list/display_list_unittests.cc

@@ -1114,7 +1114,7 @@ TEST_F(DisplayListTest, SingleOpsMightSupportGroupOpacityBlendMode) {
     static auto display_list = builder.Build();
     RUN_TESTS2(receiver.drawDisplayList(display_list);, false);
   }
-  RUN_TESTS2(receiver.drawTextBlob(TestBlob1, 0, 0);, false);
+  RUN_TESTS2(receiver.drawTextBlob(GetTestTextBlob(1), 0, 0);, false);
   RUN_TESTS2(
       receiver.drawShadow(kTestPath1, DlColor(SK_ColorBLACK), 1.0, false, 1.0);
       , false);
@@ -3145,7 +3145,7 @@ TEST_F(DisplayListTest, NopOperationsOmittedFromRecords) {
           builder.DrawAtlas(TestImage1, xforms, rects, nullptr, 2,
                             DlBlendMode::kSrcOver, DlImageSampling::kLinear,
                             nullptr, &paint);
-          builder.DrawTextBlob(TestBlob1, 10, 10, paint);
+          builder.DrawTextBlob(GetTestTextBlob(1), 10, 10, paint);
 
           // Dst mode eliminates most rendering ops except for
           // the following two, so we'll prune those manually...

engine/src/flutter/display_list/testing/dl_test_snippets.cc

@@ -901,13 +901,21 @@ std::vector<DisplayListInvocationGroup> CreateAllRenderingOps() {
       {"DrawTextBlob",
        {
            {1, 24, 1, 24,
-            [](DlOpReceiver& r) { r.drawTextBlob(TestBlob1, 10, 10); }},
+            [](DlOpReceiver& r) {
+              r.drawTextBlob(GetTestTextBlob(1), 10, 10);
+            }},
            {1, 24, 1, 24,
-            [](DlOpReceiver& r) { r.drawTextBlob(TestBlob1, 20, 10); }},
+            [](DlOpReceiver& r) {
+              r.drawTextBlob(GetTestTextBlob(1), 20, 10);
+            }},
            {1, 24, 1, 24,
-            [](DlOpReceiver& r) { r.drawTextBlob(TestBlob1, 10, 20); }},
+            [](DlOpReceiver& r) {
+              r.drawTextBlob(GetTestTextBlob(1), 10, 20);
+            }},
            {1, 24, 1, 24,
-            [](DlOpReceiver& r) { r.drawTextBlob(TestBlob2, 10, 10); }},
+            [](DlOpReceiver& r) {
+              r.drawTextBlob(GetTestTextBlob(2), 10, 10);
+            }},
        }},
       // The -1 op counts below are to indicate to the framework not to test
       // SkCanvas conversion of these ops as it converts the operation into a
@@ -966,5 +974,26 @@ std::vector<DisplayListInvocationGroup> CreateAllGroups() {
   return result;
 }
 
+SkFont CreateTestFontOfSize(SkScalar scalar) {
+  static constexpr const char* kTestFontFixture = "Roboto-Regular.ttf";
+  auto mapping = flutter::testing::OpenFixtureAsSkData(kTestFontFixture);
+  FML_CHECK(mapping);
+  return SkFont{SkTypeface::MakeFromData(mapping), scalar};
+}
+
+sk_sp<SkTextBlob> GetTestTextBlob(int index) {
+  static std::map<int, sk_sp<SkTextBlob>> text_blobs;
+  auto it = text_blobs.find(index);
+  if (it != text_blobs.end()) {
+    return it->second;
+  }
+  std::string text = "TestBlob" + std::to_string(index);
+  sk_sp<SkTextBlob> blob =
+      SkTextBlob::MakeFromText(text.c_str(), text.size(),
+                               CreateTestFontOfSize(20), SkTextEncoding::kUTF8);
+  text_blobs.insert(std::make_pair(index, blob));
+  return blob;
+}
+
 }  // namespace testing
 }  // namespace flutter

engine/src/flutter/display_list/testing/dl_test_snippets.h

@@ -7,6 +7,7 @@
 
 #include "flutter/display_list/display_list.h"
 #include "flutter/display_list/dl_builder.h"
+#include "flutter/testing/testing.h"
 
 #include "third_party/skia/include/core/SkCanvas.h"
 #include "third_party/skia/include/core/SkSurface.h"
@@ -222,12 +223,9 @@ static sk_sp<DisplayList> TestDisplayList1 =
 static sk_sp<DisplayList> TestDisplayList2 =
     MakeTestDisplayList(25, 25, SK_ColorBLUE);
 
-static sk_sp<SkTextBlob> MakeTextBlob(std::string string) {
-  return SkTextBlob::MakeFromText(string.c_str(), string.size(), SkFont(),
-                                  SkTextEncoding::kUTF8);
-}
-static sk_sp<SkTextBlob> TestBlob1 = MakeTextBlob("TestBlob1");
-static sk_sp<SkTextBlob> TestBlob2 = MakeTextBlob("TestBlob2");
+SkFont CreateTestFontOfSize(SkScalar scalar);
+
+sk_sp<SkTextBlob> GetTestTextBlob(int index);
 
 struct DisplayListInvocation {
   unsigned int op_count_;

engine/src/flutter/flow/BUILD.gn

@@ -108,7 +108,8 @@ source_set("flow") {
 
 if (enable_unittests) {
   test_fixtures("flow_fixtures") {
-    fixtures = []
+    fixtures =
+        [ "//flutter/third_party/txt/third_party/fonts/Roboto-Regular.ttf" ]
   }
 
   source_set("flow_testing") {

engine/src/flutter/shell/platform/fuchsia/flutter/BUILD.gn

@@ -657,12 +657,28 @@ if (enable_unittests) {
     deps = [ "//flutter/display_list:display_list_unittests" ]
 
     binary = "display_list_unittests"
+
+    resources = [
+      {
+        path = rebase_path(
+                "//flutter/third_party/txt/third_party/fonts/Roboto-Regular.ttf")
+        dest = "assets/Roboto-Regular.ttf"
+      },
+    ]
   }
 
   fuchsia_test_archive("display_list_render_tests") {
     deps = [ "//flutter/display_list:display_list_rendertests" ]
 
     binary = "display_list_rendertests"
+
+    resources = [
+      {
+        path = rebase_path(
+                "//flutter/third_party/txt/third_party/fonts/Roboto-Regular.ttf")
+        dest = "assets/Roboto-Regular.ttf"
+      },
+    ]
   }
 
   fuchsia_test_archive("flow_tests") {
@@ -686,6 +702,11 @@ if (enable_unittests) {
                 "//flutter/testing/resources/performance_overlay_gold_120fps.png")
         dest = "flutter/testing/resources/performance_overlay_gold_120fps.png"
       },
+      {
+        path = rebase_path(
+                "//flutter/third_party/txt/third_party/fonts/Roboto-Regular.ttf")
+        dest = "assets/Roboto-Regular.ttf"
+      },
     ]
   }