/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "gtest/gtest.h"
#include "mozilla/RefPtr.h"
#include "mozilla/dom/ImageBitmapBinding.h"
#include "mozilla/dom/ImageUtils.h"
#include "ImageConversion.h"
#include "ImageContainer.h"
#include "SourceSurfaceRawData.h"

using mozilla::ConvertToI420;
using mozilla::MakeAndAddRef;
using mozilla::MakeRefPtr;
using mozilla::Maybe;
using mozilla::Nothing;
using mozilla::Some;
using mozilla::dom::ImageBitmapFormat;
using mozilla::gfx::ChromaSubsampling;
using mozilla::gfx::DataSourceSurface;
using mozilla::gfx::IntSize;
using mozilla::gfx::SourceSurfaceAlignedRawData;
using mozilla::gfx::SurfaceFormat;
using mozilla::layers::PlanarYCbCrImage;
using mozilla::layers::SourceSurfaceImage;

class TestRedPlanarYCbCrImage2x2 final : public PlanarYCbCrImage {
 public:
  explicit TestRedPlanarYCbCrImage2x2(ImageBitmapFormat aFormat) {
    mSize = IntSize(2, 2);
    mBufferSize = sizeof(mY) + sizeof(mU) + sizeof(mV);
    mData.mPictureRect = mozilla::gfx::IntRect(mozilla::gfx::IntPoint(), mSize);
    mData.mYChannel = mY;
    mData.mYStride = 2;
    switch (aFormat) {
      case ImageBitmapFormat::YUV420P:
        mData.mChromaSubsampling = ChromaSubsampling::HALF_WIDTH_AND_HEIGHT;
        mData.mCbChannel = mU;
        mData.mCrChannel = mV;
        mData.mCbCrStride = 1;
        break;
      case ImageBitmapFormat::YUV422P:
        mData.mChromaSubsampling = ChromaSubsampling::HALF_WIDTH;
        mData.mCbChannel = mU;
        mData.mCrChannel = mV;
        mData.mCbCrStride = 1;
        break;
      case ImageBitmapFormat::YUV444P:
        mData.mChromaSubsampling = ChromaSubsampling::FULL;
        mData.mCbChannel = mU;
        mData.mCrChannel = mV;
        mData.mCbCrStride = 2;
        break;
      case ImageBitmapFormat::YUV420SP_NV12:
        mData.mChromaSubsampling = ChromaSubsampling::HALF_WIDTH_AND_HEIGHT;
        mData.mCbChannel = mU;
        mData.mCrChannel = mData.mCbChannel + 1;
        mData.mCbCrStride = 1;
        mData.mCrSkip = 1;
        mData.mCbSkip = 1;
        mU[1] = mV[0];
        mU[3] = mV[1];
        break;
      case ImageBitmapFormat::YUV420SP_NV21:
        mData.mChromaSubsampling = ChromaSubsampling::HALF_WIDTH_AND_HEIGHT;
        mData.mCrChannel = mU;
        mData.mCbChannel = mData.mCrChannel + 1;
        mData.mCbCrStride = 1;
        mData.mCrSkip = 1;
        mData.mCbSkip = 1;
        mU[0] = mV[0];
        mU[2] = mV[1];
        break;
      default:
        MOZ_CRASH("Unsupported ImageBitmapFormat!");
        break;
    }
  }

  nsresult CopyData(const Data& aData) override {
    return NS_ERROR_NOT_IMPLEMENTED;
  }

  size_t SizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf) const {
    return 0;
  }

 private:
  uint8_t mY[4] = {0x52, 0x52, 0x52, 0x52};
  uint8_t mU[4] = {0x5A, 0x5A, 0x5A, 0x5A};
  uint8_t mV[4] = {0xEF, 0xEF, 0xEF, 0xEF};
};

static already_AddRefed<SourceSurfaceImage> CreateRedSurfaceImage2x2(
    SurfaceFormat aFormat) {
  uint8_t redPixel[4] = {};

  switch (aFormat) {
    case SurfaceFormat::R8G8B8A8:
    case SurfaceFormat::R8G8B8X8:
      redPixel[0] = 0xFF;
      redPixel[3] = 0xFF;
      break;
    case SurfaceFormat::B8G8R8A8:
    case SurfaceFormat::B8G8R8X8:
      redPixel[2] = 0xFF;
      redPixel[3] = 0xFF;
      break;
    case SurfaceFormat::R5G6B5_UINT16:
      redPixel[1] = 0xF8;
      break;
    default:
      MOZ_ASSERT_UNREACHABLE("Unsupported format!");
      return nullptr;
  }

  const IntSize size(2, 2);

  auto surface = MakeRefPtr<SourceSurfaceAlignedRawData>();
  if (NS_WARN_IF(!surface->Init(size, aFormat, /* aClearMem */ false, 0, 0))) {
    return nullptr;
  }

  DataSourceSurface::ScopedMap map(surface, DataSourceSurface::WRITE);
  if (NS_WARN_IF(!map.IsMapped())) {
    return nullptr;
  }

  const uint32_t bpp = BytesPerPixel(aFormat);
  MOZ_ASSERT(bpp <= sizeof(redPixel));

  uint8_t* rowPtr = map.GetData();
  for (int32_t row = 0; row < size.height; ++row) {
    for (int32_t col = 0; col < size.width; ++col) {
      for (uint32_t i = 0; i < bpp; ++i) {
        rowPtr[col * bpp + i] = redPixel[i];
      }
    }
    rowPtr += map.GetStride();
  }

  return MakeAndAddRef<SourceSurfaceImage>(size, surface);
}

TEST(MediaImageConversion, ConvertToI420)
{
  uint8_t y[20] = {};
  uint8_t u[20] = {};
  uint8_t v[20] = {};

  auto checkBuf = [&](const uint8_t* aY, const uint8_t* aU, const uint8_t* aV) {
    for (size_t i = 0; i < sizeof(y); ++i) {
      EXPECT_EQ(y[i], aY[i]);
    }
    for (size_t i = 0; i < sizeof(u); ++i) {
      EXPECT_EQ(u[i], aU[i]);
    }
    for (size_t i = 0; i < sizeof(v); ++i) {
      EXPECT_EQ(v[i], aV[i]);
    }
    memset(y, 0, sizeof(y));
    memset(u, 0, sizeof(u));
    memset(v, 0, sizeof(v));
  };

  static constexpr uint8_t yRed1x1[20] = {0x52};
  static constexpr uint8_t yRed2x2[20] = {0x52, 0x52, 0x52, 0x52};
  static constexpr uint8_t yRed4x4[20] = {0x52, 0x52, 0x52, 0x52, 0x52, 0x52,
                                          0x52, 0x52, 0x52, 0x52, 0x52, 0x52,
                                          0x52, 0x52, 0x52, 0x52};

  static constexpr uint8_t uRed1x1[20] = {0x5A};
  static constexpr uint8_t uRed2x2[20] = {0x5A, 0x5A, 0x5A, 0x5A};

  static constexpr uint8_t vRed1x1[20] = {0xEF};
  static constexpr uint8_t vRed2x2[20] = {0xEF, 0xEF, 0xEF, 0xEF};

  auto checkImage = [&](mozilla::layers::Image* aImage,
                        const Maybe<ImageBitmapFormat>& aFormat) {
    ASSERT_TRUE(!!aImage);

    mozilla::dom::ImageUtils utils(aImage);
    Maybe<ImageBitmapFormat> format = utils.GetFormat();
    ASSERT_EQ(format.isSome(), aFormat.isSome());
    if (format.isSome()) {
      ASSERT_EQ(format.value(), aFormat.value());
    }

    EXPECT_TRUE(
        NS_SUCCEEDED(ConvertToI420(aImage, y, 2, u, 1, v, 1, IntSize(2, 2))));
    checkBuf(yRed2x2, uRed1x1, vRed1x1);

    EXPECT_TRUE(
        NS_SUCCEEDED(ConvertToI420(aImage, y, 1, u, 1, v, 1, IntSize(1, 1))));
    checkBuf(yRed1x1, uRed1x1, vRed1x1);

    EXPECT_TRUE(
        NS_SUCCEEDED(ConvertToI420(aImage, y, 4, u, 2, v, 2, IntSize(4, 4))));
    checkBuf(yRed4x4, uRed2x2, vRed2x2);
  };

  RefPtr<SourceSurfaceImage> imgRgba =
      CreateRedSurfaceImage2x2(SurfaceFormat::R8G8B8A8);
  checkImage(imgRgba, Some(ImageBitmapFormat::RGBA32));

  RefPtr<SourceSurfaceImage> imgBgra =
      CreateRedSurfaceImage2x2(SurfaceFormat::B8G8R8A8);
  checkImage(imgBgra, Some(ImageBitmapFormat::BGRA32));

  RefPtr<SourceSurfaceImage> imgRgb565 =
      CreateRedSurfaceImage2x2(SurfaceFormat::R5G6B5_UINT16);
  checkImage(imgRgb565, Nothing());

  auto imgYuv420p =
      MakeRefPtr<TestRedPlanarYCbCrImage2x2>(ImageBitmapFormat::YUV420P);
  checkImage(imgYuv420p, Some(ImageBitmapFormat::YUV420P));

  auto imgYuv422p =
      MakeRefPtr<TestRedPlanarYCbCrImage2x2>(ImageBitmapFormat::YUV422P);
  checkImage(imgYuv422p, Some(ImageBitmapFormat::YUV422P));

  auto imgYuv444p =
      MakeRefPtr<TestRedPlanarYCbCrImage2x2>(ImageBitmapFormat::YUV444P);
  checkImage(imgYuv444p, Some(ImageBitmapFormat::YUV444P));

  auto imgYuvNv12 =
      MakeRefPtr<TestRedPlanarYCbCrImage2x2>(ImageBitmapFormat::YUV420SP_NV12);
  checkImage(imgYuvNv12, Some(ImageBitmapFormat::YUV420SP_NV12));

  auto imgYuvNv21 =
      MakeRefPtr<TestRedPlanarYCbCrImage2x2>(ImageBitmapFormat::YUV420SP_NV21);
  checkImage(imgYuvNv21, Some(ImageBitmapFormat::YUV420SP_NV21));
}