// 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