[Impeller] construct text frames on UI thread.

display_list/BUILD.gn

@@ -87,6 +87,7 @@ source_set("display_list") {
   public_deps = [
     "//flutter/fml",
     "//flutter/impeller/runtime_stage",
+    "//flutter/impeller/typographer",
     "//third_party/skia",
   ]
 

display_list/benchmarking/dl_complexity_gl.cc

@@ -637,6 +637,11 @@ void DisplayListGLComplexityCalculator::GLHelper::drawTextBlob(
   draw_text_blob_count_++;
 }
 
+void DisplayListGLComplexityCalculator::GLHelper::drawTextFrame(
+    const std::shared_ptr<impeller::TextFrame>& text_frame,
+    SkScalar x,
+    SkScalar y) {}
+
 void DisplayListGLComplexityCalculator::GLHelper::drawShadow(
     const SkPath& path,
     const DlColor color,

display_list/benchmarking/dl_complexity_gl.h

@@ -70,6 +70,9 @@ class DisplayListGLComplexityCalculator
     void drawTextBlob(const sk_sp<SkTextBlob> blob,
                       SkScalar x,
                       SkScalar y) override;
+    void drawTextFrame(const std::shared_ptr<impeller::TextFrame>& text_frame,
+                       SkScalar x,
+                       SkScalar y) override;
     void drawShadow(const SkPath& path,
                     const DlColor color,
                     const SkScalar elevation,

display_list/benchmarking/dl_complexity_metal.cc

@@ -581,6 +581,11 @@ void DisplayListMetalComplexityCalculator::MetalHelper::drawTextBlob(
   draw_text_blob_count_++;
 }
 
+void DisplayListMetalComplexityCalculator::MetalHelper::drawTextFrame(
+    const std::shared_ptr<impeller::TextFrame>& text_frame,
+    SkScalar x,
+    SkScalar y) {}
+
 void DisplayListMetalComplexityCalculator::MetalHelper::drawShadow(
     const SkPath& path,
     const DlColor color,

display_list/benchmarking/dl_complexity_metal.h

@@ -70,6 +70,9 @@ class DisplayListMetalComplexityCalculator
     void drawTextBlob(const sk_sp<SkTextBlob> blob,
                       SkScalar x,
                       SkScalar y) override;
+    void drawTextFrame(const std::shared_ptr<impeller::TextFrame>& text_frame,
+                       SkScalar x,
+                       SkScalar y) override;
     void drawShadow(const SkPath& path,
                     const DlColor color,
                     const SkScalar elevation,

display_list/display_list.h

@@ -136,6 +136,7 @@ namespace flutter {
                                     \
   V(DrawDisplayList)                \
   V(DrawTextBlob)                   \
+  V(DrawTextFrame)                  \
                                     \
   V(DrawShadow)                     \
   V(DrawShadowTransparentOccluder)

display_list/dl_builder.cc

@@ -1302,6 +1302,48 @@ void DisplayListBuilder::DrawTextBlob(const sk_sp<SkTextBlob>& blob,
   SetAttributesFromPaint(paint, DisplayListOpFlags::kDrawTextBlobFlags);
   drawTextBlob(blob, x, y);
 }
+
+void DisplayListBuilder::drawTextFrame(
+    const std::shared_ptr<impeller::TextFrame>& text_frame,
+    SkScalar x,
+    SkScalar y) {
+  DisplayListAttributeFlags flags = kDrawTextBlobFlags;
+  OpResult result = PaintResult(current_, flags);
+  if (result == OpResult::kNoEffect) {
+    return;
+  }
+  impeller::Rect bounds = text_frame->GetBounds();
+  SkRect sk_bounds = SkRect::MakeLTRB(bounds.GetLeft(), bounds.GetTop(),
+                                      bounds.GetRight(), bounds.GetBottom());
+  bool unclipped = AccumulateOpBounds(sk_bounds.makeOffset(x, y), flags);
+  // TODO(https://github.com/flutter/flutter/issues/82202): Remove once the
+  // unit tests can use Fuchsia's font manager instead of the empty default.
+  // Until then we might encounter empty bounds for otherwise valid text and
+  // thus we ignore the results from AccumulateOpBounds.
+#if defined(OS_FUCHSIA)
+  unclipped = true;
+#endif  // OS_FUCHSIA
+  if (unclipped) {
+    Push<DrawTextFrameOp>(0, 1, text_frame, x, y);
+    // There is no way to query if the glyphs of a text blob overlap and
+    // there are no current guarantees from either Skia or Impeller that
+    // they will protect overlapping glyphs from the effects of overdraw
+    // so we must make the conservative assessment that this DL layer is
+    // not compatible with group opacity inheritance.
+    UpdateLayerOpacityCompatibility(false);
+    UpdateLayerResult(result);
+  }
+}
+
+void DisplayListBuilder::DrawTextFrame(
+    const std::shared_ptr<impeller::TextFrame>& text_frame,
+    SkScalar x,
+    SkScalar y,
+    const DlPaint& paint) {
+  SetAttributesFromPaint(paint, DisplayListOpFlags::kDrawTextBlobFlags);
+  drawTextFrame(text_frame, x, y);
+}
+
 void DisplayListBuilder::DrawShadow(const SkPath& path,
                                     const DlColor color,
                                     const SkScalar elevation,

display_list/dl_builder.h

@@ -224,6 +224,16 @@ class DisplayListBuilder final : public virtual DlCanvas,
                     SkScalar x,
                     SkScalar y,
                     const DlPaint& paint) override;
+
+  void drawTextFrame(const std::shared_ptr<impeller::TextFrame>& text_frame,
+                     SkScalar x,
+                     SkScalar y) override;
+
+  void DrawTextFrame(const std::shared_ptr<impeller::TextFrame>& text_frame,
+                     SkScalar x,
+                     SkScalar y,
+                     const DlPaint& paint) override;
+
   // |DlCanvas|
   void DrawShadow(const SkPath& path,
                   const DlColor color,

display_list/dl_canvas.h

@@ -18,6 +18,8 @@
 #include "third_party/skia/include/core/SkRect.h"
 #include "third_party/skia/include/core/SkTextBlob.h"
 
+#include "impeller/typographer/text_frame.h"
+
 namespace flutter {
 
 //------------------------------------------------------------------------------
@@ -152,7 +154,7 @@ class DlCanvas {
   virtual void DrawVertices(const DlVertices* vertices,
                             DlBlendMode mode,
                             const DlPaint& paint) = 0;
-  void DrawVertices(const std::shared_ptr<const DlVertices> vertices,
+  void DrawVertices(const std::shared_ptr<const DlVertices>& vertices,
                     DlBlendMode mode,
                     const DlPaint& paint) {
     DrawVertices(vertices.get(), mode, paint);
@@ -201,6 +203,13 @@ class DlCanvas {
                          const DlPaint* paint = nullptr) = 0;
   virtual void DrawDisplayList(const sk_sp<DisplayList> display_list,
                                SkScalar opacity = SK_Scalar1) = 0;
+
+  virtual void DrawTextFrame(
+      const std::shared_ptr<impeller::TextFrame>& text_frame,
+      SkScalar x,
+      SkScalar y,
+      const DlPaint& paint) = 0;
+
   virtual void DrawTextBlob(const sk_sp<SkTextBlob>& blob,
                             SkScalar x,
                             SkScalar y,

display_list/dl_op_receiver.h

@@ -257,6 +257,10 @@ class DlOpReceiver {
   virtual void drawTextBlob(const sk_sp<SkTextBlob> blob,
                             SkScalar x,
                             SkScalar y) = 0;
+  virtual void drawTextFrame(
+      const std::shared_ptr<impeller::TextFrame>& text_frame,
+      SkScalar x,
+      SkScalar y) = 0;
   virtual void drawShadow(const SkPath& path,
                           const DlColor color,
                           const SkScalar elevation,

display_list/dl_op_records.h

@@ -12,6 +12,7 @@
 #include "flutter/display_list/effects/dl_color_source.h"
 #include "flutter/fml/macros.h"
 
+#include "impeller/typographer/text_frame.h"
 #include "third_party/skia/include/core/SkRSXform.h"
 
 namespace flutter {
@@ -1084,6 +1085,25 @@ struct DrawTextBlobOp final : DrawOpBase {
   }
 };
 
+struct DrawTextFrameOp final : DrawOpBase {
+  static const auto kType = DisplayListOpType::kDrawTextFrame;
+
+  DrawTextFrameOp(const std::shared_ptr<impeller::TextFrame>& text_frame,
+                  SkScalar x,
+                  SkScalar y)
+      : x(x), y(y), text_frame(text_frame) {}
+
+  const SkScalar x;
+  const SkScalar y;
+  const std::shared_ptr<impeller::TextFrame> text_frame;
+
+  void dispatch(DispatchContext& ctx) const {
+    if (op_needed(ctx)) {
+      ctx.receiver.drawTextFrame(text_frame, x, y);
+    }
+  }
+};
+
 // 4 byte header + 28 byte payload packs evenly into 32 bytes
 #define DEFINE_DRAW_SHADOW_OP(name, transparent_occluder)                     \
   struct Draw##name##Op final : DrawOpBase {                                  \

display_list/skia/dl_sk_canvas.cc

@@ -325,6 +325,14 @@ void DlSkCanvasAdapter::DrawTextBlob(const sk_sp<SkTextBlob>& blob,
   delegate_->drawTextBlob(blob, x, y, ToSk(paint));
 }
 
+void DlSkCanvasAdapter::DrawTextFrame(
+    const std::shared_ptr<impeller::TextFrame>& text_frame,
+    SkScalar x,
+    SkScalar y,
+    const DlPaint& paint) {
+  FML_CHECK(false);
+}
+
 void DlSkCanvasAdapter::DrawShadow(const SkPath& path,
                                    const DlColor color,
                                    const SkScalar elevation,

display_list/skia/dl_sk_canvas.h

@@ -7,6 +7,7 @@
 
 #include "flutter/display_list/dl_canvas.h"
 #include "flutter/display_list/skia/dl_sk_types.h"
+#include "impeller/typographer/text_frame.h"
 
 namespace flutter {
 
@@ -144,6 +145,10 @@ class DlSkCanvasAdapter final : public virtual DlCanvas {
                     SkScalar x,
                     SkScalar y,
                     const DlPaint& paint) override;
+  void DrawTextFrame(const std::shared_ptr<impeller::TextFrame>& text_frame,
+                     SkScalar x,
+                     SkScalar y,
+                     const DlPaint& paint) override;
   void DrawShadow(const SkPath& path,
                   const DlColor color,
                   const SkScalar elevation,

display_list/skia/dl_sk_dispatcher.cc

@@ -270,6 +270,13 @@ void DlSkCanvasDispatcher::drawTextBlob(const sk_sp<SkTextBlob> blob,
   canvas_->drawTextBlob(blob, x, y, paint());
 }
 
+void DlSkCanvasDispatcher::drawTextFrame(
+    const std::shared_ptr<impeller::TextFrame>& text_frame,
+    SkScalar x,
+    SkScalar y) {
+  FML_CHECK(false);
+}
+
 void DlSkCanvasDispatcher::DrawShadow(SkCanvas* canvas,
                                       const SkPath& path,
                                       DlColor color,

display_list/skia/dl_sk_dispatcher.h

@@ -98,6 +98,9 @@ class DlSkCanvasDispatcher : public virtual DlOpReceiver,
   void drawTextBlob(const sk_sp<SkTextBlob> blob,
                     SkScalar x,
                     SkScalar y) override;
+  void drawTextFrame(const std::shared_ptr<impeller::TextFrame>& text_frame,
+                     SkScalar x,
+                     SkScalar y) override;
   void drawShadow(const SkPath& path,
                   const DlColor color,
                   const SkScalar elevation,

display_list/utils/dl_receiver_utils.h

@@ -129,6 +129,9 @@ class IgnoreDrawDispatchHelper : public virtual DlOpReceiver {
   void drawTextBlob(const sk_sp<SkTextBlob> blob,
                     SkScalar x,
                     SkScalar y) override {}
+  void drawTextFrame(const std::shared_ptr<impeller::TextFrame>& text_frame,
+                     SkScalar x,
+                     SkScalar y) override {}
   void drawShadow(const SkPath& path,
                   const DlColor color,
                   const SkScalar elevation,

flow/BUILD.gn

@@ -99,7 +99,10 @@ source_set("flow") {
   deps = [ "//third_party/skia" ]
 
   if (impeller_supports_rendering) {
-    deps += [ "//flutter/impeller" ]
+    deps += [
+      "//flutter/impeller",
+      "//flutter/impeller/typographer/backends/skia:typographer_skia_backend",
+    ]
   }
 }
 

flow/layers/performance_overlay_layer.cc

@@ -14,6 +14,9 @@
 #include "flow/stopwatch_sk.h"
 #include "third_party/skia/include/core/SkFont.h"
 #include "third_party/skia/include/core/SkTextBlob.h"
+#ifdef IMPELLER_SUPPORTS_RENDERING
+#include "impeller/typographer/backends/skia/text_frame_skia.h"  // nogncheck
+#endif  // IMPELLER_SUPPORTS_RENDERING
 
 namespace flutter {
 namespace {
@@ -50,7 +53,14 @@ void VisualizeStopWatch(DlCanvas* canvas,
         stopwatch, label_prefix, font_path);
     // Historically SK_ColorGRAY (== 0xFF888888) was used here
     DlPaint paint(0xFF888888);
+#ifdef IMPELLER_SUPPORTS_RENDERING
+    if (impeller_enabled) {
+      canvas->DrawTextFrame(impeller::MakeTextFrameFromTextBlobSkia(text),
+                            x + label_x, y + height + label_y, paint);
+    }
+#endif  // IMPELLER_SUPPORTS_RENDERING
     canvas->DrawTextBlob(text, x + label_x, y + height + label_y, paint);
+    return;
   }
 }
 

impeller/aiks/aiks_unittests.cc

@@ -5,7 +5,6 @@
 #include <array>
 #include <cmath>
 #include <cstdlib>
-#include <iostream>
 #include <memory>
 #include <tuple>
 #include <utility>
@@ -1278,11 +1277,7 @@ bool RenderTextInCanvasSkia(const std::shared_ptr<Context>& context,
   }
 
   // Create the Impeller text frame and draw it at the designated baseline.
-  auto maybe_frame = MakeTextFrameFromTextBlobSkia(blob);
-  if (!maybe_frame.has_value()) {
-    return false;
-  }
-  auto frame = maybe_frame.value();
+  auto frame = MakeTextFrameFromTextBlobSkia(blob);
 
   Paint text_paint;
   text_paint.color = Color::Yellow().WithAlpha(options.alpha);
@@ -1471,7 +1466,7 @@ TEST_P(AiksTest, CanRenderTextOutsideBoundaries) {
     {
       auto blob = SkTextBlob::MakeFromString(t.text, sk_font);
       ASSERT_NE(blob, nullptr);
-      auto frame = MakeTextFrameFromTextBlobSkia(blob).value();
+      auto frame = MakeTextFrameFromTextBlobSkia(blob);
       canvas.DrawTextFrame(frame, Point(), text_paint);
     }
     canvas.Restore();
@@ -3094,12 +3089,7 @@ TEST_P(AiksTest, TextForegroundShaderWithTransform) {
 
   auto blob = SkTextBlob::MakeFromString("Hello", sk_font);
   ASSERT_NE(blob, nullptr);
-  auto maybe_frame = MakeTextFrameFromTextBlobSkia(blob);
-  ASSERT_TRUE(maybe_frame.has_value());
-  if (!maybe_frame.has_value()) {
-    return;
-  }
-  auto frame = maybe_frame.value();
+  auto frame = MakeTextFrameFromTextBlobSkia(blob);
   canvas.DrawTextFrame(frame, Point(), text_paint);
 
   ASSERT_TRUE(OpenPlaygroundHere(canvas.EndRecordingAsPicture()));

impeller/aiks/canvas.cc

@@ -533,15 +533,15 @@ void Canvas::SaveLayer(const Paint& paint,
   }
 }
 
-void Canvas::DrawTextFrame(const TextFrame& text_frame,
+void Canvas::DrawTextFrame(const std::shared_ptr<TextFrame>& text_frame,
                            Point position,
                            const Paint& paint) {
   Entity entity;
   entity.SetStencilDepth(GetStencilDepth());
   entity.SetBlendMode(paint.blend_mode);
 
   auto text_contents = std::make_shared<TextContents>();
-  text_contents->SetTextFrame(TextFrame(text_frame));
+  text_contents->SetTextFrame(text_frame);
   text_contents->SetColor(paint.color);
 
   entity.SetTransformation(GetCurrentTransformation() *

impeller/aiks/canvas.h

@@ -139,7 +139,7 @@ class Canvas {
 
   void DrawPicture(const Picture& picture);
 
-  void DrawTextFrame(const TextFrame& text_frame,
+  void DrawTextFrame(const std::shared_ptr<TextFrame>& text_frame,
                      Point position,
                      const Paint& paint);