[Impeller] Direct tessellation of simple filled round rects (flutter#48919)

Simple round rects with the same width and height at each corner are tessellated directly for fill operations, but not yet for stroke operations.

Author: flar

ci/licenses_golden/licenses_flutter

@@ -5115,6 +5115,8 @@ ORIGIN: ../../../flutter/impeller/entity/geometry/point_field_geometry.cc + ../.
 ORIGIN: ../../../flutter/impeller/entity/geometry/point_field_geometry.h + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/impeller/entity/geometry/rect_geometry.cc + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/impeller/entity/geometry/rect_geometry.h + ../../../flutter/LICENSE
+ORIGIN: ../../../flutter/impeller/entity/geometry/round_rect_geometry.cc + ../../../flutter/LICENSE
+ORIGIN: ../../../flutter/impeller/entity/geometry/round_rect_geometry.h + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/impeller/entity/geometry/stroke_path_geometry.cc + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/impeller/entity/geometry/stroke_path_geometry.h + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/impeller/entity/geometry/vertices_geometry.cc + ../../../flutter/LICENSE
@@ -7916,6 +7918,8 @@ FILE: ../../../flutter/impeller/entity/geometry/point_field_geometry.cc
 FILE: ../../../flutter/impeller/entity/geometry/point_field_geometry.h
 FILE: ../../../flutter/impeller/entity/geometry/rect_geometry.cc
 FILE: ../../../flutter/impeller/entity/geometry/rect_geometry.h
+FILE: ../../../flutter/impeller/entity/geometry/round_rect_geometry.cc
+FILE: ../../../flutter/impeller/entity/geometry/round_rect_geometry.h
 FILE: ../../../flutter/impeller/entity/geometry/stroke_path_geometry.cc
 FILE: ../../../flutter/impeller/entity/geometry/stroke_path_geometry.h
 FILE: ../../../flutter/impeller/entity/geometry/vertices_geometry.cc

impeller/aiks/aiks_unittests.cc

@@ -2264,6 +2264,74 @@ TEST_P(AiksTest, FilledEllipsesRenderCorrectly) {
   ASSERT_TRUE(OpenPlaygroundHere(canvas.EndRecordingAsPicture()));
 }
 
+TEST_P(AiksTest, FilledRoundRectsRenderCorrectly) {
+  Canvas canvas;
+  canvas.Scale(GetContentScale());
+  Paint paint;
+  const int color_count = 3;
+  Color colors[color_count] = {
+      Color::Blue(),
+      Color::Green(),
+      Color::Crimson(),
+  };
+
+  paint.color = Color::White();
+  canvas.DrawPaint(paint);
+
+  int c_index = 0;
+  for (int i = 0; i < 4; i++) {
+    for (int j = 0; j < 4; j++) {
+      paint.color = colors[(c_index++) % color_count];
+      canvas.DrawRRect(Rect::MakeXYWH(i * 100 + 10, j * 100 + 20, 80, 80),
+                       Size(i * 5 + 10, j * 5 + 10), paint);
+    }
+  }
+
+  std::vector<Color> gradient_colors = {
+      Color{0x1f / 255.0, 0.0, 0x5c / 255.0, 1.0},
+      Color{0x5b / 255.0, 0.0, 0x60 / 255.0, 1.0},
+      Color{0x87 / 255.0, 0x01 / 255.0, 0x60 / 255.0, 1.0},
+      Color{0xac / 255.0, 0x25 / 255.0, 0x53 / 255.0, 1.0},
+      Color{0xe1 / 255.0, 0x6b / 255.0, 0x5c / 255.0, 1.0},
+      Color{0xf3 / 255.0, 0x90 / 255.0, 0x60 / 255.0, 1.0},
+      Color{0xff / 255.0, 0xb5 / 255.0, 0x6b / 250.0, 1.0}};
+  std::vector<Scalar> stops = {
+      0.0,
+      (1.0 / 6.0) * 1,
+      (1.0 / 6.0) * 2,
+      (1.0 / 6.0) * 3,
+      (1.0 / 6.0) * 4,
+      (1.0 / 6.0) * 5,
+      1.0,
+  };
+  auto texture = CreateTextureForFixture("airplane.jpg",
+                                         /*enable_mipmapping=*/true);
+
+  paint.color = Color::White().WithAlpha(0.1);
+
+  paint.color_source = ColorSource::MakeRadialGradient(
+      {500, 550}, 75, std::move(gradient_colors), std::move(stops),
+      Entity::TileMode::kMirror, {});
+  for (int i = 1; i <= 10; i++) {
+    int j = 11 - i;
+    canvas.DrawRRect(Rect::MakeLTRB(500 - i * 20, 550 - j * 20,  //
+                                    500 + i * 20, 550 + j * 20),
+                     Size(i * 10, j * 10), paint);
+  }
+
+  paint.color_source = ColorSource::MakeImage(
+      texture, Entity::TileMode::kRepeat, Entity::TileMode::kRepeat, {},
+      Matrix::MakeTranslation({500, 20}));
+  for (int i = 1; i <= 10; i++) {
+    int j = 11 - i;
+    canvas.DrawRRect(Rect::MakeLTRB(700 - i * 20, 220 - j * 20,  //
+                                    700 + i * 20, 220 + j * 20),
+                     Size(i * 10, j * 10), paint);
+  }
+
+  ASSERT_TRUE(OpenPlaygroundHere(canvas.EndRecordingAsPicture()));
+}
+
 TEST_P(AiksTest, GradientStrokesRenderCorrectly) {
   // Compare with https://fiddle.skia.org/c/027392122bec8ac2b5d5de00a4b9bbe2
   auto callback = [&](AiksContext& renderer) -> std::optional<Picture> {
@@ -4335,9 +4403,9 @@ TEST_P(AiksTest, GaussianBlurAtPeripheryVertical) {
 
   canvas.Scale(GetContentScale());
   canvas.DrawRRect(Rect::MakeLTRB(0, 0, GetWindowSize().width, 100),
-                   Point(10, 10), Paint{.color = Color::LimeGreen()});
+                   Size(10, 10), Paint{.color = Color::LimeGreen()});
   canvas.DrawRRect(Rect::MakeLTRB(0, 110, GetWindowSize().width, 210),
-                   Point(10, 10), Paint{.color = Color::Magenta()});
+                   Size(10, 10), Paint{.color = Color::Magenta()});
   canvas.ClipRect(Rect::MakeLTRB(100, 0, 200, GetWindowSize().height));
   canvas.SaveLayer({.blend_mode = BlendMode::kSource}, std::nullopt,
                    ImageFilter::MakeBlur(Sigma(20.0), Sigma(20.0),
@@ -4358,7 +4426,7 @@ TEST_P(AiksTest, GaussianBlurAtPeripheryHorizontal) {
       Rect::MakeXYWH(0, 0, boston->GetSize().width, boston->GetSize().height),
       Rect::MakeLTRB(0, 0, GetWindowSize().width, 100), Paint{});
   canvas.DrawRRect(Rect::MakeLTRB(0, 110, GetWindowSize().width, 210),
-                   Point(10, 10), Paint{.color = Color::Magenta()});
+                   Size(10, 10), Paint{.color = Color::Magenta()});
   canvas.ClipRect(Rect::MakeLTRB(0, 50, GetWindowSize().width, 150));
   canvas.SaveLayer({.blend_mode = BlendMode::kSource}, std::nullopt,
                    ImageFilter::MakeBlur(Sigma(20.0), Sigma(20.0),

impeller/aiks/canvas.cc

@@ -365,27 +365,31 @@ void Canvas::DrawOval(const Rect& rect, const Paint& paint) {
   GetCurrentPass().AddEntity(std::move(entity));
 }
 
-void Canvas::DrawRRect(Rect rect, Point corner_radii, const Paint& paint) {
-  if (corner_radii.x == corner_radii.y &&
-      AttemptDrawBlurredRRect(rect, corner_radii.x, paint)) {
+void Canvas::DrawRRect(const Rect& rect,
+                       const Size& corner_radii,
+                       const Paint& paint) {
+  if (corner_radii.IsSquare() &&
+      AttemptDrawBlurredRRect(rect, corner_radii.width, paint)) {
     return;
   }
-  auto path = PathBuilder{}
-                  .SetConvexity(Convexity::kConvex)
-                  .AddRoundedRect(rect, corner_radii)
-                  .SetBounds(rect)
-                  .TakePath();
+
   if (paint.style == Paint::Style::kFill) {
     Entity entity;
     entity.SetTransform(GetCurrentTransform());
     entity.SetClipDepth(GetClipDepth());
     entity.SetBlendMode(paint.blend_mode);
     entity.SetContents(CreateContentsForGeometryWithFilters(
-        paint, Geometry::MakeFillPath(std::move(path))));
+        paint, Geometry::MakeRoundRect(rect, corner_radii)));
 
     GetCurrentPass().AddEntity(std::move(entity));
     return;
   }
+
+  auto path = PathBuilder{}
+                  .SetConvexity(Convexity::kConvex)
+                  .AddRoundedRect(rect, corner_radii)
+                  .SetBounds(rect)
+                  .TakePath();
   DrawPath(std::move(path), paint);
 }
 
@@ -445,7 +449,7 @@ void Canvas::ClipRect(const Rect& rect, Entity::ClipOperation clip_op) {
 }
 
 void Canvas::ClipRRect(const Rect& rect,
-                       Point corner_radii,
+                       const Size& corner_radii,
                        Entity::ClipOperation clip_op) {
   auto path = PathBuilder{}
                   .SetConvexity(Convexity::kConvex)
@@ -455,8 +459,8 @@ void Canvas::ClipRRect(const Rect& rect,
 
   auto size = rect.GetSize();
   // Does the rounded rect have a flat part on the top/bottom or left/right?
-  bool flat_on_TB = corner_radii.x * 2 < size.width;
-  bool flat_on_LR = corner_radii.y * 2 < size.height;
+  bool flat_on_TB = corner_radii.width * 2 < size.width;
+  bool flat_on_LR = corner_radii.height * 2 < size.height;
   std::optional<Rect> inner_rect = (flat_on_LR && flat_on_TB)
                                        ? rect.Expand(-corner_radii)
                                        : std::make_optional<Rect>();
@@ -475,7 +479,7 @@ void Canvas::ClipRRect(const Rect& rect,
       IntersectCulling(rect);
       break;
     case Entity::ClipOperation::kDifference:
-      if (corner_radii.x <= 0.0 || corner_radii.y <= 0) {
+      if (corner_radii.IsEmpty()) {
         SubtractCulling(rect);
       } else {
         // We subtract the inner "tall" and "wide" rectangle pieces
@@ -484,10 +488,10 @@ void Canvas::ClipRRect(const Rect& rect,
         // Since this is a subtract operation, we can subtract each
         // rectangle piece individually without fear of interference.
         if (flat_on_TB) {
-          SubtractCulling(rect.Expand({-corner_radii.x, 0.0}));
+          SubtractCulling(rect.Expand(Size{-corner_radii.width, 0.0}));
         }
         if (flat_on_LR) {
-          SubtractCulling(rect.Expand({0.0, -corner_radii.y}));
+          SubtractCulling(rect.Expand(Size{0.0, -corner_radii.height}));
         }
       }
       break;

impeller/aiks/canvas.h

@@ -106,7 +106,9 @@ class Canvas {
 
   void DrawOval(const Rect& rect, const Paint& paint);
 
-  void DrawRRect(Rect rect, Point corner_radii, const Paint& paint);
+  void DrawRRect(const Rect& rect,
+                 const Size& corner_radii,
+                 const Paint& paint);
 
   void DrawCircle(const Point& center, Scalar radius, const Paint& paint);
 
@@ -136,7 +138,7 @@ class Canvas {
 
   void ClipRRect(
       const Rect& rect,
-      Point corner_radii,
+      const Size& corner_radii,
       Entity::ClipOperation clip_op = Entity::ClipOperation::kIntersect);
 
   void DrawPicture(const Picture& picture);

impeller/aiks/canvas_recorder.h

@@ -195,7 +195,9 @@ class CanvasRecorder {
                                paint);
   }
 
-  void DrawRRect(Rect rect, Point corner_radii, const Paint& paint) {
+  void DrawRRect(const Rect& rect,
+                 const Size& corner_radii,
+                 const Paint& paint) {
     return ExecuteAndSerialize(FLT_CANVAS_RECORDER_OP_ARG(DrawRRect), rect,
                                corner_radii, paint);
   }
@@ -248,7 +250,7 @@ class CanvasRecorder {
 
   void ClipRRect(
       const Rect& rect,
-      Point corner_radii,
+      const Size& corner_radii,
       Entity::ClipOperation clip_op = Entity::ClipOperation::kIntersect) {
     return ExecuteAndSerialize(FLT_CANVAS_RECORDER_OP_ARG(ClipRRect), rect,
                                corner_radii, clip_op);

impeller/display_list/dl_dispatcher.cc

@@ -731,7 +731,7 @@ void DlDispatcher::clipRRect(const SkRRect& rrect, ClipOp clip_op, bool is_aa) {
                      ToClipOperation(clip_op));
   } else if (rrect.isSimple()) {
     canvas_.ClipRRect(skia_conversions::ToRect(rrect.rect()),
-                      skia_conversions::ToPoint(rrect.getSimpleRadii()),
+                      skia_conversions::ToSize(rrect.getSimpleRadii()),
                       ToClipOperation(clip_op));
   } else {
     canvas_.ClipPath(skia_conversions::ToPath(rrect), ToClipOperation(clip_op));
@@ -782,8 +782,7 @@ void DlDispatcher::drawCircle(const SkPoint& center, SkScalar radius) {
 void DlDispatcher::drawRRect(const SkRRect& rrect) {
   if (rrect.isSimple()) {
     canvas_.DrawRRect(skia_conversions::ToRect(rrect.rect()),
-                      skia_conversions::ToPoint(rrect.getSimpleRadii()),
-                      paint_);
+                      skia_conversions::ToSize(rrect.getSimpleRadii()), paint_);
   } else {
     canvas_.DrawPath(skia_conversions::ToPath(rrect), paint_);
   }
@@ -817,7 +816,7 @@ void DlDispatcher::SimplifyOrDrawPath(CanvasType& canvas,
   SkRRect rrect;
   if (path.isRRect(&rrect) && rrect.isSimple()) {
     canvas.DrawRRect(skia_conversions::ToRect(rrect.rect()),
-                     skia_conversions::ToPoint(rrect.getSimpleRadii()), paint);
+                     skia_conversions::ToSize(rrect.getSimpleRadii()), paint);
     return;
   }
 

impeller/display_list/skia_conversions.cc

@@ -141,6 +141,10 @@ Point ToPoint(const SkPoint& point) {
   return Point::MakeXY(point.fX, point.fY);
 }
 
+Size ToSize(const SkPoint& point) {
+  return Size(point.fX, point.fY);
+}
+
 Color ToColor(const flutter::DlColor& color) {
   return {
       static_cast<Scalar>(color.getRedF()),    //

impeller/display_list/skia_conversions.h

@@ -33,6 +33,8 @@ std::vector<Point> ToPoints(const SkPoint points[], int count);
 
 Point ToPoint(const SkPoint& point);
 
+Size ToSize(const SkPoint& point);
+
 Color ToColor(const flutter::DlColor& color);
 
 std::vector<Matrix> ToRSXForms(const SkRSXform xform[], int count);

impeller/display_list/skia_conversions_unittests.cc

@@ -11,6 +11,24 @@
 namespace impeller {
 namespace testing {
 
+TEST(SkiaConversionsTest, SkPointToPoint) {
+  for (int x = -100; x < 100; x += 4) {
+    for (int y = -100; y < 100; y += 4) {
+      EXPECT_EQ(skia_conversions::ToPoint(SkPoint::Make(x * 0.25f, y * 0.25f)),
+                Point(x * 0.25f, y * 0.25f));
+    }
+  }
+}
+
+TEST(SkiaConversionsTest, SkPointToSize) {
+  for (int x = -100; x < 100; x += 4) {
+    for (int y = -100; y < 100; y += 4) {
+      EXPECT_EQ(skia_conversions::ToSize(SkPoint::Make(x * 0.25f, y * 0.25f)),
+                Size(x * 0.25f, y * 0.25f));
+    }
+  }
+}
+
 TEST(SkiaConversionsTest, ToColor) {
   // Create a color with alpha, red, green, and blue values that are all
   // trivially divisible by 255 so that we can test the conversion results in

impeller/entity/BUILD.gn

@@ -207,6 +207,8 @@ impeller_component("entity") {
     "geometry/point_field_geometry.h",
     "geometry/rect_geometry.cc",
     "geometry/rect_geometry.h",
+    "geometry/round_rect_geometry.cc",
+    "geometry/round_rect_geometry.h",
     "geometry/stroke_path_geometry.cc",
     "geometry/stroke_path_geometry.h",
     "geometry/vertices_geometry.cc",