[Impeller] Refactor ColorSource resolution to use explicit factory types

ci/licenses_golden/licenses_flutter

@@ -1030,6 +1030,8 @@ FILE: ../../../flutter/impeller/aiks/aiks_playground.h
 FILE: ../../../flutter/impeller/aiks/aiks_unittests.cc
 FILE: ../../../flutter/impeller/aiks/canvas.cc
 FILE: ../../../flutter/impeller/aiks/canvas.h
+FILE: ../../../flutter/impeller/aiks/color_source_factory.cc
+FILE: ../../../flutter/impeller/aiks/color_source_factory.h
 FILE: ../../../flutter/impeller/aiks/image.cc
 FILE: ../../../flutter/impeller/aiks/image.h
 FILE: ../../../flutter/impeller/aiks/paint.cc
@@ -1129,6 +1131,10 @@ FILE: ../../../flutter/impeller/compiler/types.cc
 FILE: ../../../flutter/impeller/compiler/types.h
 FILE: ../../../flutter/impeller/compiler/utilities.cc
 FILE: ../../../flutter/impeller/compiler/utilities.h
+FILE: ../../../flutter/impeller/display_list/conversion_utilities.cc
+FILE: ../../../flutter/impeller/display_list/conversion_utilities.h
+FILE: ../../../flutter/impeller/display_list/display_list_color_source_factory.cc
+FILE: ../../../flutter/impeller/display_list/display_list_color_source_factory.h
 FILE: ../../../flutter/impeller/display_list/display_list_dispatcher.cc
 FILE: ../../../flutter/impeller/display_list/display_list_dispatcher.h
 FILE: ../../../flutter/impeller/display_list/display_list_image_impeller.cc

impeller/aiks/BUILD.gn

@@ -10,6 +10,8 @@ impeller_component("aiks") {
     "aiks_context.h",
     "canvas.cc",
     "canvas.h",
+    "color_source_factory.cc",
+    "color_source_factory.h",
     "image.cc",
     "image.h",
     "paint.cc",

impeller/aiks/canvas.cc

@@ -160,9 +160,7 @@ void Canvas::DrawPaint(const Paint& paint) {
 bool Canvas::AttemptDrawBlurredRRect(const Rect& rect,
                                      Scalar corner_radius,
                                      const Paint& paint) {
-  if (paint.color_source == nullptr ||
-      paint.color_source_type != Paint::ColorSourceType::kColor ||
-      paint.style != Paint::Style::kFill) {
+  if (!paint.color_source || paint.style != Paint::Style::kFill) {
     return false;
   }
 
@@ -375,17 +373,16 @@ void Canvas::DrawTextFrame(const TextFrame& text_frame,
 
 void Canvas::DrawVertices(const Vertices& vertices,
                           BlendMode blend_mode,
-                          Paint paint) {
+                          const Paint& paint) {
   auto geometry = Geometry::MakeVertices(vertices);
 
   Entity entity;
   entity.SetTransformation(GetCurrentTransformation());
   entity.SetStencilDepth(GetStencilDepth());
   entity.SetBlendMode(paint.blend_mode);
 
-  if (paint.color_source.has_value()) {
-    auto& source = paint.color_source.value();
-    auto contents = source();
+  if (paint.color_source) {
+    auto contents = paint.color_source->MakeContents();
     contents->SetGeometry(std::move(geometry));
     contents->SetAlpha(paint.color.alpha);
     entity.SetContents(paint.WithFilters(std::move(contents), true));

impeller/aiks/canvas.h

@@ -99,7 +99,7 @@ class Canvas {
 
   void DrawVertices(const Vertices& vertices,
                     BlendMode blend_mode,
-                    Paint paint);
+                    const Paint& paint);
 
   void DrawAtlas(const std::shared_ptr<Image>& atlas,
                  std::vector<Matrix> transforms,

impeller/aiks/color_source_factory.cc

@@ -0,0 +1,11 @@
+// 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/aiks/color_source_factory.h"
+
+namespace impeller {
+
+ColorSourceFactory::~ColorSourceFactory() = default;
+
+}  // namespace impeller

impeller/aiks/color_source_factory.h

@@ -0,0 +1,32 @@
+// 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.
+
+#pragma once
+
+#include <memory>
+
+#include "impeller/entity/contents/color_source_contents.h"
+
+namespace impeller {
+
+class ColorSourceFactory {
+ public:
+  enum class ColorSourceType {
+    kColor,
+    kImage,
+    kLinearGradient,
+    kRadialGradient,
+    kConicalGradient,
+    kSweepGradient,
+    kRuntimeEffect,
+  };
+
+  virtual ~ColorSourceFactory();
+
+  virtual std::shared_ptr<ColorSourceContents> MakeContents() = 0;
+
+  virtual ColorSourceType GetType() = 0;
+};
+
+}  // namespace impeller

impeller/aiks/paint.cc

@@ -27,9 +27,8 @@ std::shared_ptr<Contents> Paint::CreateContentsForEntity(const Path& path,
 
 std::shared_ptr<Contents> Paint::CreateContentsForGeometry(
     std::unique_ptr<Geometry> geometry) const {
-  if (color_source.has_value()) {
-    auto& source = color_source.value();
-    auto contents = source();
+  if (color_source) {
+    auto contents = color_source->MakeContents();
     contents->SetGeometry(std::move(geometry));
     contents->SetAlpha(color.alpha);
     return contents;

impeller/aiks/paint.h

@@ -7,6 +7,7 @@
 #include <memory>
 
 #include "flutter/fml/macros.h"
+#include "impeller/aiks/color_source_factory.h"
 #include "impeller/entity/contents/contents.h"
 #include "impeller/entity/contents/filters/color_filter_contents.h"
 #include "impeller/entity/contents/filters/filter_contents.h"
@@ -29,23 +30,12 @@ struct Paint {
       FilterInput::Ref,
       bool is_solid_color,
       const Matrix& effect_transform)>;
-  using ColorSourceProc = std::function<std::shared_ptr<ColorSourceContents>()>;
 
   enum class Style {
     kFill,
     kStroke,
   };
 
-  enum class ColorSourceType {
-    kColor,
-    kImage,
-    kLinearGradient,
-    kRadialGradient,
-    kConicalGradient,
-    kSweepGradient,
-    kRuntimeEffect,
-  };
-
   struct MaskBlurDescriptor {
     FilterContents::BlurStyle style;
     Sigma sigma;
@@ -56,10 +46,9 @@ struct Paint {
         const Matrix& effect_matrix) const;
   };
 
-  Color color = Color::Black();
-  std::optional<ColorSourceProc> color_source;
-  ColorSourceType color_source_type = ColorSourceType::kColor;
+  std::shared_ptr<ColorSourceFactory> color_source;
 
+  Color color = Color::Black();
   Scalar stroke_width = 0.0;
   Cap stroke_cap = Cap::kButt;
   Join stroke_join = Join::kMiter;

impeller/display_list/BUILD.gn

@@ -6,6 +6,10 @@ import("//flutter/impeller/tools/impeller.gni")
 
 impeller_component("display_list") {
   sources = [
+    "conversion_utilities.cc",
+    "conversion_utilities.h",
+    "display_list_color_source_factory.cc",
+    "display_list_color_source_factory.h",
     "display_list_dispatcher.cc",
     "display_list_dispatcher.h",
     "display_list_image_impeller.cc",

impeller/display_list/conversion_utilities.cc

@@ -0,0 +1,179 @@
+// 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/display_list/conversion_utilities.h"
+
+namespace impeller {
+
+BlendMode ToBlendMode(flutter::DlBlendMode mode) {
+  switch (mode) {
+    case flutter::DlBlendMode::kClear:
+      return BlendMode::kClear;
+    case flutter::DlBlendMode::kSrc:
+      return BlendMode::kSource;
+    case flutter::DlBlendMode::kDst:
+      return BlendMode::kDestination;
+    case flutter::DlBlendMode::kSrcOver:
+      return BlendMode::kSourceOver;
+    case flutter::DlBlendMode::kDstOver:
+      return BlendMode::kDestinationOver;
+    case flutter::DlBlendMode::kSrcIn:
+      return BlendMode::kSourceIn;
+    case flutter::DlBlendMode::kDstIn:
+      return BlendMode::kDestinationIn;
+    case flutter::DlBlendMode::kSrcOut:
+      return BlendMode::kSourceOut;
+    case flutter::DlBlendMode::kDstOut:
+      return BlendMode::kDestinationOut;
+    case flutter::DlBlendMode::kSrcATop:
+      return BlendMode::kSourceATop;
+    case flutter::DlBlendMode::kDstATop:
+      return BlendMode::kDestinationATop;
+    case flutter::DlBlendMode::kXor:
+      return BlendMode::kXor;
+    case flutter::DlBlendMode::kPlus:
+      return BlendMode::kPlus;
+    case flutter::DlBlendMode::kModulate:
+      return BlendMode::kModulate;
+    case flutter::DlBlendMode::kScreen:
+      return BlendMode::kScreen;
+    case flutter::DlBlendMode::kOverlay:
+      return BlendMode::kOverlay;
+    case flutter::DlBlendMode::kDarken:
+      return BlendMode::kDarken;
+    case flutter::DlBlendMode::kLighten:
+      return BlendMode::kLighten;
+    case flutter::DlBlendMode::kColorDodge:
+      return BlendMode::kColorDodge;
+    case flutter::DlBlendMode::kColorBurn:
+      return BlendMode::kColorBurn;
+    case flutter::DlBlendMode::kHardLight:
+      return BlendMode::kHardLight;
+    case flutter::DlBlendMode::kSoftLight:
+      return BlendMode::kSoftLight;
+    case flutter::DlBlendMode::kDifference:
+      return BlendMode::kDifference;
+    case flutter::DlBlendMode::kExclusion:
+      return BlendMode::kExclusion;
+    case flutter::DlBlendMode::kMultiply:
+      return BlendMode::kMultiply;
+    case flutter::DlBlendMode::kHue:
+      return BlendMode::kHue;
+    case flutter::DlBlendMode::kSaturation:
+      return BlendMode::kSaturation;
+    case flutter::DlBlendMode::kColor:
+      return BlendMode::kColor;
+    case flutter::DlBlendMode::kLuminosity:
+      return BlendMode::kLuminosity;
+  }
+  FML_UNREACHABLE();
+}
+
+Entity::TileMode ToTileMode(flutter::DlTileMode tile_mode) {
+  switch (tile_mode) {
+    case flutter::DlTileMode::kClamp:
+      return Entity::TileMode::kClamp;
+    case flutter::DlTileMode::kRepeat:
+      return Entity::TileMode::kRepeat;
+    case flutter::DlTileMode::kMirror:
+      return Entity::TileMode::kMirror;
+    case flutter::DlTileMode::kDecal:
+      return Entity::TileMode::kDecal;
+  }
+}
+
+impeller::SamplerDescriptor ToSamplerDescriptor(
+    const flutter::DlImageSampling options) {
+  impeller::SamplerDescriptor desc;
+  switch (options) {
+    case flutter::DlImageSampling::kNearestNeighbor:
+      desc.min_filter = desc.mag_filter = impeller::MinMagFilter::kNearest;
+      desc.label = "Nearest Sampler";
+      break;
+    case flutter::DlImageSampling::kLinear:
+      desc.min_filter = desc.mag_filter = impeller::MinMagFilter::kLinear;
+      desc.label = "Linear Sampler";
+      break;
+    case flutter::DlImageSampling::kMipmapLinear:
+      desc.min_filter = desc.mag_filter = impeller::MinMagFilter::kLinear;
+      desc.mip_filter = impeller::MipFilter::kLinear;
+      desc.label = "Mipmap Linear Sampler";
+      break;
+    default:
+      break;
+  }
+  return desc;
+}
+
+impeller::SamplerDescriptor ToSamplerDescriptor(
+    const flutter::DlFilterMode options) {
+  impeller::SamplerDescriptor desc;
+  switch (options) {
+    case flutter::DlFilterMode::kNearest:
+      desc.min_filter = desc.mag_filter = impeller::MinMagFilter::kNearest;
+      desc.label = "Nearest Sampler";
+      break;
+    case flutter::DlFilterMode::kLinear:
+      desc.min_filter = desc.mag_filter = impeller::MinMagFilter::kLinear;
+      desc.label = "Linear Sampler";
+      break;
+    default:
+      break;
+  }
+  return desc;
+}
+
+Matrix ToMatrix(const SkMatrix& m) {
+  return Matrix{
+      // clang-format off
+      m[0], m[3], 0, m[6],
+      m[1], m[4], 0, m[7],
+      0,    0,    1, 0,
+      m[2], m[5], 0, m[8],
+      // clang-format on
+  };
+}
+
+Point ToPoint(const SkPoint& point) {
+  return Point::MakeXY(point.fX, point.fY);
+}
+
+Color ToColor(const SkColor& color) {
+  return {
+      static_cast<Scalar>(SkColorGetR(color) / 255.0),  //
+      static_cast<Scalar>(SkColorGetG(color) / 255.0),  //
+      static_cast<Scalar>(SkColorGetB(color) / 255.0),  //
+      static_cast<Scalar>(SkColorGetA(color) / 255.0)   //
+  };
+}
+
+std::vector<Color> ToColors(const flutter::DlColor colors[], int count) {
+  auto result = std::vector<Color>();
+  if (colors == nullptr) {
+    return result;
+  }
+  for (int i = 0; i < count; i++) {
+    result.push_back(ToColor(colors[i]));
+  }
+  return result;
+}
+
+std::vector<Matrix> ToRSXForms(const SkRSXform xform[], int count) {
+  auto result = std::vector<Matrix>();
+  for (int i = 0; i < count; i++) {
+    auto form = xform[i];
+    // clang-format off
+    auto matrix = Matrix{
+      form.fSCos, form.fSSin, 0, 0,
+     -form.fSSin, form.fSCos, 0, 0,
+      0,          0,          1, 0,
+      form.fTx,   form.fTy,   0, 1
+    };
+    // clang-format on
+    result.push_back(matrix);
+  }
+  return result;
+}
+
+}  // namespace impeller