/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 * 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 "TextureD3D11.h"
#include "CompositorD3D11.h"
#include "gfxContext.h"
#include "Effects.h"
#include "mozilla/layers/YCbCrImageDataSerializer.h"
#include "gfxWindowsPlatform.h"
#include "gfxD2DSurface.h"
#include "gfx2DGlue.h"

namespace mozilla {

using namespace gfx;

namespace layers {

static DXGI_FORMAT
SurfaceFormatToDXGIFormat(gfx::SurfaceFormat aFormat)
{
  switch (aFormat) {
    case SurfaceFormat::B8G8R8A8:
      return DXGI_FORMAT_B8G8R8A8_UNORM;
    case SurfaceFormat::B8G8R8X8:
      return DXGI_FORMAT_B8G8R8A8_UNORM;
    case SurfaceFormat::A8:
      return DXGI_FORMAT_A8_UNORM;
    default:
      MOZ_ASSERT(false, "unsupported format");
      return DXGI_FORMAT_UNKNOWN;
  }
}

static uint32_t
GetRequiredTilesD3D11(uint32_t aSize, uint32_t aMaxSize)
{
  uint32_t requiredTiles = aSize / aMaxSize;
  if (aSize % aMaxSize) {
    requiredTiles++;
  }
  return requiredTiles;
}

static IntRect
GetTileRectD3D11(uint32_t aID, IntSize aSize, uint32_t aMaxSize)
{
  uint32_t horizontalTiles = GetRequiredTilesD3D11(aSize.width, aMaxSize);
  uint32_t verticalTiles = GetRequiredTilesD3D11(aSize.height, aMaxSize);

  uint32_t verticalTile = aID / horizontalTiles;
  uint32_t horizontalTile = aID % horizontalTiles;

  return IntRect(horizontalTile * aMaxSize,
                 verticalTile * aMaxSize,
                 horizontalTile < (horizontalTiles - 1) ? aMaxSize : aSize.width % aMaxSize,
                 verticalTile < (verticalTiles - 1) ? aMaxSize : aSize.height % aMaxSize);
}

DataTextureSourceD3D11::DataTextureSourceD3D11(SurfaceFormat aFormat,
                                               CompositorD3D11* aCompositor,
                                               TextureFlags aFlags)
  : mCompositor(aCompositor)
  , mFormat(aFormat)
  , mFlags(aFlags)
  , mCurrentTile(0)
  , mIsTiled(false)
  , mIterating(false)
{
  MOZ_COUNT_CTOR(DataTextureSourceD3D11);
}

DataTextureSourceD3D11::DataTextureSourceD3D11(SurfaceFormat aFormat,
                                               CompositorD3D11* aCompositor,
                                               ID3D11Texture2D* aTexture)
: mCompositor(aCompositor)
, mFormat(aFormat)
, mFlags(TextureFlags::NO_FLAGS)
, mCurrentTile(0)
, mIsTiled(false)
, mIterating(false)
{
  MOZ_COUNT_CTOR(DataTextureSourceD3D11);

  mTexture = aTexture;
  D3D11_TEXTURE2D_DESC desc;
  aTexture->GetDesc(&desc);

  mSize = IntSize(desc.Width, desc.Height);
}



DataTextureSourceD3D11::~DataTextureSourceD3D11()
{
  MOZ_COUNT_DTOR(DataTextureSourceD3D11);
}


template<typename T> // ID3D10Texture2D or ID3D11Texture2D
static void LockD3DTexture(T* aTexture)
{
  MOZ_ASSERT(aTexture);
  RefPtr<IDXGIKeyedMutex> mutex;
  aTexture->QueryInterface((IDXGIKeyedMutex**)byRef(mutex));
  if (mutex) {
    mutex->AcquireSync(0, INFINITE);
  }
}

template<typename T> // ID3D10Texture2D or ID3D11Texture2D
static void UnlockD3DTexture(T* aTexture)
{
  MOZ_ASSERT(aTexture);
  RefPtr<IDXGIKeyedMutex> mutex;
  aTexture->QueryInterface((IDXGIKeyedMutex**)byRef(mutex));
  if (mutex) {
    mutex->ReleaseSync(0);
  }
}

TemporaryRef<TextureHost>
CreateTextureHostD3D11(const SurfaceDescriptor& aDesc,
                       ISurfaceAllocator* aDeallocator,
                       TextureFlags aFlags)
{
  RefPtr<TextureHost> result;
  switch (aDesc.type()) {
    case SurfaceDescriptor::TSurfaceDescriptorShmem:
    case SurfaceDescriptor::TSurfaceDescriptorMemory: {
      result = CreateBackendIndependentTextureHost(aDesc, aDeallocator, aFlags);
      break;
    }
    case SurfaceDescriptor::TSurfaceDescriptorD3D10: {
      result = new DXGITextureHostD3D11(aFlags,
                                        aDesc.get_SurfaceDescriptorD3D10());
      break;
    }
    default: {
      NS_WARNING("Unsupported SurfaceDescriptor type");
    }
  }
  return result;
}

TextureClientD3D11::TextureClientD3D11(gfx::SurfaceFormat aFormat, TextureFlags aFlags)
  : TextureClient(aFlags)
  , mFormat(aFormat)
  , mIsLocked(false)
  , mNeedsClear(false)
{}

TextureClientD3D11::~TextureClientD3D11()
{
#ifdef DEBUG
  // An Azure DrawTarget needs to be locked when it gets nullptr'ed as this is
  // when it calls EndDraw. This EndDraw should not execute anything so it
  // shouldn't -really- need the lock but the debug layer chokes on this.
  if (mDrawTarget) {
    MOZ_ASSERT(!mIsLocked);
    MOZ_ASSERT(mTexture);
    MOZ_ASSERT(mDrawTarget->refCount() == 1);
    LockD3DTexture(mTexture.get());
    mDrawTarget = nullptr;
    UnlockD3DTexture(mTexture.get());
  }
#endif
}

bool
TextureClientD3D11::Lock(OpenMode aMode)
{
  if (!mTexture) {
    return false;
  }
  MOZ_ASSERT(!mIsLocked, "The Texture is already locked!");
  LockD3DTexture(mTexture.get());
  mIsLocked = true;

  if (mNeedsClear) {
    mDrawTarget = GetAsDrawTarget();
    mDrawTarget->ClearRect(Rect(0, 0, GetSize().width, GetSize().height));
    mNeedsClear = false;
  }

  return true;
}

void
TextureClientD3D11::Unlock()
{
  MOZ_ASSERT(mIsLocked, "Unlocked called while the texture is not locked!");

  if (mDrawTarget) {
    // see the comment on TextureClient::GetAsDrawTarget.
    // This DrawTarget is internal to the TextureClient and is only exposed to the
    // outside world between Lock() and Unlock(). This assertion checks that no outside
    // reference remains by the time Unlock() is called.
    MOZ_ASSERT(mDrawTarget->refCount() == 1);
    mDrawTarget->Flush();
  }

  // The DrawTarget is created only once, and is only usable between calls
  // to Lock and Unlock.
  UnlockD3DTexture(mTexture.get());
  mIsLocked = false;
}

TemporaryRef<DrawTarget>
TextureClientD3D11::GetAsDrawTarget()
{
  MOZ_ASSERT(mIsLocked, "Calling TextureClient::GetAsDrawTarget without locking :(");

  if (!mTexture) {
    return nullptr;
  }

  if (mDrawTarget) {
    return mDrawTarget;
  }

  mDrawTarget = Factory::CreateDrawTargetForD3D10Texture(mTexture, mFormat);
  return mDrawTarget;
}

bool
TextureClientD3D11::AllocateForSurface(gfx::IntSize aSize, TextureAllocationFlags aFlags)
{
  mSize = aSize;
  ID3D10Device* device = gfxWindowsPlatform::GetPlatform()->GetD3D10Device();

  CD3D10_TEXTURE2D_DESC newDesc(DXGI_FORMAT_B8G8R8A8_UNORM,
                                aSize.width, aSize.height, 1, 1,
                                D3D10_BIND_RENDER_TARGET | D3D10_BIND_SHADER_RESOURCE);

  newDesc.MiscFlags = D3D10_RESOURCE_MISC_SHARED_KEYEDMUTEX;

  HRESULT hr = device->CreateTexture2D(&newDesc, nullptr, byRef(mTexture));

  if (FAILED(hr)) {
    LOGD3D11("Error creating texture for client!");
    return false;
  }

  // Defer clearing to the next time we lock to avoid an extra (expensive) lock.
  mNeedsClear = aFlags & ALLOC_CLEAR_BUFFER;

  return true;
}

bool
TextureClientD3D11::ToSurfaceDescriptor(SurfaceDescriptor& aOutDescriptor)
{
  if (!IsAllocated()) {
    return false;
  }

  RefPtr<IDXGIResource> resource;
  mTexture->QueryInterface((IDXGIResource**)byRef(resource));
  HANDLE sharedHandle;
  HRESULT hr = resource->GetSharedHandle(&sharedHandle);

  if (FAILED(hr)) {
    LOGD3D11("Error getting shared handle for texture.");
    return false;
  }

  aOutDescriptor = SurfaceDescriptorD3D10((WindowsHandle)sharedHandle, mFormat, mSize);
  return true;
}

DXGITextureHostD3D11::DXGITextureHostD3D11(TextureFlags aFlags,
                                           const SurfaceDescriptorD3D10& aDescriptor)
  : TextureHost(aFlags)
  , mHandle(aDescriptor.handle())
  , mFormat(aDescriptor.format())
  , mIsLocked(false)
{}

ID3D11Device*
DXGITextureHostD3D11::GetDevice()
{
  return mCompositor ? mCompositor->GetDevice() : nullptr;
}

void
DXGITextureHostD3D11::SetCompositor(Compositor* aCompositor)
{
  mCompositor = static_cast<CompositorD3D11*>(aCompositor);
}

bool
DXGITextureHostD3D11::Lock()
{
  if (!GetDevice()) {
    NS_WARNING("trying to lock a TextureHost without a D3D device");
    return false;
  }
  if (!mTextureSource) {
    RefPtr<ID3D11Texture2D> tex;
    HRESULT hr = GetDevice()->OpenSharedResource((HANDLE)mHandle,
                                                 __uuidof(ID3D11Texture2D),
                                                 (void**)(ID3D11Texture2D**)byRef(tex));
    if (FAILED(hr)) {
      NS_WARNING("Failed to open shared texture");
      return false;
    }

    mTextureSource = new DataTextureSourceD3D11(mFormat, mCompositor, tex);
    D3D11_TEXTURE2D_DESC desc;
    tex->GetDesc(&desc);
    mSize = IntSize(desc.Width, desc.Height);
  }

  LockD3DTexture(mTextureSource->GetD3D11Texture());

  mIsLocked = true;
  return true;
}

void
DXGITextureHostD3D11::Unlock()
{
  MOZ_ASSERT(mIsLocked);
  UnlockD3DTexture(mTextureSource->GetD3D11Texture());
  mIsLocked = false;
}

NewTextureSource*
DXGITextureHostD3D11::GetTextureSources()
{
  return mTextureSource.get();
}

bool
DataTextureSourceD3D11::Update(DataSourceSurface* aSurface,
                               nsIntRegion* aDestRegion,
                               IntPoint* aSrcOffset)
{
  // Right now we only support full surface update. If aDestRegion is provided,
  // It will be ignored. Incremental update with a source offset is only used
  // on Mac so it is not clear that we ever will need to support it for D3D.
  MOZ_ASSERT(!aSrcOffset);
  MOZ_ASSERT(aSurface);

  if (!mCompositor || !mCompositor->GetDevice()) {
    return false;
  }

  uint32_t bpp = BytesPerPixel(aSurface->GetFormat());
  DXGI_FORMAT dxgiFormat = SurfaceFormatToDXGIFormat(aSurface->GetFormat());

  mSize = aSurface->GetSize();
  mFormat = aSurface->GetFormat();

  CD3D11_TEXTURE2D_DESC desc(dxgiFormat, mSize.width, mSize.height,
                             1, 1, D3D11_BIND_SHADER_RESOURCE,
                             D3D11_USAGE_IMMUTABLE);

  int32_t maxSize = mCompositor->GetMaxTextureSize();
  if ((mSize.width <= maxSize && mSize.height <= maxSize) ||
      (mFlags & TextureFlags::DISALLOW_BIGIMAGE)) {
    D3D11_SUBRESOURCE_DATA initData;
    initData.pSysMem = aSurface->GetData();
    initData.SysMemPitch = aSurface->Stride();

    mCompositor->GetDevice()->CreateTexture2D(&desc, &initData, byRef(mTexture));
    mIsTiled = false;
    if (!mTexture) {
      Reset();
      return false;
    }
  } else {
    mIsTiled = true;
    uint32_t tileCount = GetRequiredTilesD3D11(mSize.width, maxSize) *
                         GetRequiredTilesD3D11(mSize.height, maxSize);

    mTileTextures.resize(tileCount);
    mTexture = nullptr;

    for (uint32_t i = 0; i < tileCount; i++) {
      IntRect tileRect = GetTileRect(i);

      desc.Width = tileRect.width;
      desc.Height = tileRect.height;

      D3D11_SUBRESOURCE_DATA initData;
      initData.pSysMem = aSurface->GetData() +
                         tileRect.y * aSurface->Stride() +
                         tileRect.x * bpp;
      initData.SysMemPitch = aSurface->Stride();

      mCompositor->GetDevice()->CreateTexture2D(&desc, &initData, byRef(mTileTextures[i]));
      if (!mTileTextures[i]) {
        Reset();
        return false;
      }
    }
  }
  return true;
}

ID3D11Texture2D*
DataTextureSourceD3D11::GetD3D11Texture() const
{
  return mIterating ? mTileTextures[mCurrentTile]
                    : mTexture;
}

void
DataTextureSourceD3D11::Reset()
{
  mTexture = nullptr;
  mTileTextures.resize(0);
  mIsTiled = false;
  mSize.width = 0;
  mSize.height = 0;
}

IntRect
DataTextureSourceD3D11::GetTileRect(uint32_t aIndex) const
{
  return GetTileRectD3D11(aIndex, mSize, mCompositor->GetMaxTextureSize());
}

nsIntRect
DataTextureSourceD3D11::GetTileRect()
{
  IntRect rect = GetTileRect(mCurrentTile);
  return nsIntRect(rect.x, rect.y, rect.width, rect.height);
}

void
DataTextureSourceD3D11::SetCompositor(Compositor* aCompositor)
{
  CompositorD3D11* d3dCompositor = static_cast<CompositorD3D11*>(aCompositor);
  if (mCompositor && mCompositor != d3dCompositor) {
    Reset();
  }
  mCompositor = d3dCompositor;
}

CompositingRenderTargetD3D11::CompositingRenderTargetD3D11(ID3D11Texture2D* aTexture,
                                                           const gfx::IntPoint& aOrigin)
  : CompositingRenderTarget(aOrigin)
{
  MOZ_ASSERT(aTexture);

  mTexture = aTexture;

  RefPtr<ID3D11Device> device;
  mTexture->GetDevice(byRef(device));

  HRESULT hr = device->CreateRenderTargetView(mTexture, nullptr, byRef(mRTView));

  if (FAILED(hr)) {
    LOGD3D11("Failed to create RenderTargetView.");
  }
}

IntSize
CompositingRenderTargetD3D11::GetSize() const
{
  return TextureSourceD3D11::GetSize();
}

}
}