/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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 "GLContext.h"                  // for GLContext, etc
#include "mozilla/Assertions.h"         // for MOZ_ASSERT, etc
#include "mozilla/layers/ISurfaceAllocator.h"
#include "mozilla/layers/TextureClientOGL.h"
#include "mozilla/gfx/2D.h"             // for Factory
#include "mozilla/gfx/Point.h"          // for IntSize
#include "GLLibraryEGL.h"

#ifdef MOZ_WIDGET_ANDROID
#include <jni.h>
#include <android/native_window.h>
#include <android/native_window_jni.h>
#endif

using namespace mozilla::gl;

namespace mozilla {
namespace layers {

class CompositableForwarder;

////////////////////////////////////////////////////////////////////////
// AndroidSurface

#ifdef MOZ_WIDGET_ANDROID

already_AddRefed<TextureClient>
AndroidSurfaceTextureData::CreateTextureClient(AndroidSurfaceTextureHandle aHandle,
                                               gfx::IntSize aSize,
                                               bool aContinuous,
                                               gl::OriginPos aOriginPos,
                                               LayersIPCChannel* aAllocator,
                                               TextureFlags aFlags)
{
  if (aOriginPos == gl::OriginPos::BottomLeft) {
    aFlags |= TextureFlags::ORIGIN_BOTTOM_LEFT;
  }

  return TextureClient::CreateWithData(
    new AndroidSurfaceTextureData(aHandle, aSize, aContinuous),
    aFlags, aAllocator
  );
}

AndroidSurfaceTextureData::AndroidSurfaceTextureData(AndroidSurfaceTextureHandle aHandle,
                                                     gfx::IntSize aSize, bool aContinuous)
  : mHandle(aHandle)
  , mSize(aSize)
  , mContinuous(aContinuous)
{
  MOZ_ASSERT(mHandle);
}

AndroidSurfaceTextureData::~AndroidSurfaceTextureData()
{}

void
AndroidSurfaceTextureData::FillInfo(TextureData::Info& aInfo) const
{
  aInfo.size = mSize;
  aInfo.format = gfx::SurfaceFormat::UNKNOWN;
  aInfo.hasIntermediateBuffer = false;
  aInfo.hasSynchronization = false;
  aInfo.supportsMoz2D = false;
  aInfo.canExposeMappedData = false;
}

bool
AndroidSurfaceTextureData::Serialize(SurfaceDescriptor& aOutDescriptor)
{
  aOutDescriptor = SurfaceTextureDescriptor(mHandle,
                                            mSize,
                                            gfx::SurfaceFormat::R8G8B8A8,
                                            mContinuous,
                                            false /* do not ignore transform */);
  return true;
}

#endif // MOZ_WIDGET_ANDROID

////////////////////////////////////////////////////////////////////////
// AndroidNativeWindow

#ifdef MOZ_WIDGET_ANDROID

AndroidNativeWindowTextureData*
AndroidNativeWindowTextureData::Create(gfx::IntSize aSize,
                                       SurfaceFormat aFormat)
{
  if (aFormat != SurfaceFormat::R8G8B8A8 &&
      aFormat != SurfaceFormat::R8G8B8X8 &&
      aFormat != SurfaceFormat::B8G8R8A8 &&
      aFormat != SurfaceFormat::B8G8R8X8 &&
      aFormat != SurfaceFormat::R5G6B5_UINT16) {
    return nullptr;
  }

  auto surface = java::GeckoSurface::LocalRef(
      java::SurfaceAllocator::AcquireSurface(aSize.width, aSize.height,
                                             true /* single-buffer mode */));
  if (surface) {
    return new AndroidNativeWindowTextureData(surface, aSize, aFormat);
  }

  return nullptr;
}

AndroidNativeWindowTextureData::AndroidNativeWindowTextureData(java::GeckoSurface::Param aSurface,
                                                               gfx::IntSize aSize,
                                                               SurfaceFormat aFormat)
: mSurface(aSurface)
, mIsLocked(false)
, mSize(aSize)
, mFormat(aFormat)
{
  mNativeWindow = ANativeWindow_fromSurface(jni::GetEnvForThread(),
                                            mSurface.Get());
  MOZ_ASSERT(mNativeWindow, "Failed to create NativeWindow.");

  // SurfaceTextures don't technically support BGR, but we can just pretend to be RGB.
  int32_t format = WINDOW_FORMAT_RGBA_8888;
  switch (aFormat) {
  case SurfaceFormat::R8G8B8A8:
  case SurfaceFormat::B8G8R8A8:
    format = WINDOW_FORMAT_RGBA_8888;
    break;

  case SurfaceFormat::R8G8B8X8:
  case SurfaceFormat::B8G8R8X8:
    format = WINDOW_FORMAT_RGBX_8888;
    break;

  case SurfaceFormat::R5G6B5_UINT16:
    format = WINDOW_FORMAT_RGB_565;
    break;

  default:
    MOZ_ASSERT(false, "Unsupported AndroidNativeWindowTextureData format.");
  }

  DebugOnly<int32_t> r = ANativeWindow_setBuffersGeometry(mNativeWindow,
                                                          mSize.width,
                                                          mSize.height,
                                                          format);
  MOZ_ASSERT(r == 0, "ANativeWindow_setBuffersGeometry failed.");

  // Ideally here we'd call ANativeWindow_setBuffersTransform() with the
  // identity transform, but that is only available on api level >= 26.
  // Instead use the SurfaceDescriptor's ignoreTransform flag when serializing.
}

void
AndroidNativeWindowTextureData::FillInfo(TextureData::Info& aInfo) const
{
  aInfo.size = mSize;
  aInfo.format = mFormat;
  aInfo.hasIntermediateBuffer = false;
  aInfo.hasSynchronization = false;
  aInfo.supportsMoz2D = true;
  aInfo.canExposeMappedData = false;
  aInfo.canConcurrentlyReadLock = false;
}

bool
AndroidNativeWindowTextureData::Serialize(SurfaceDescriptor& aOutDescriptor)
{
  aOutDescriptor = SurfaceTextureDescriptor(mSurface->GetHandle(),
                                            mSize,
                                            mFormat,
                                            false /* not continuous */,
                                            true /* ignore transform */);
  return true;
}

bool
AndroidNativeWindowTextureData::Lock(OpenMode)
{
  // ANativeWindows can only be locked and unlocked a single time, after which
  // we must wait until they receive ownership back from the host.
  // Therefore we must only actually call ANativeWindow_lock() once per cycle.
  if (!mIsLocked) {
    int32_t r = ANativeWindow_lock(mNativeWindow, &mBuffer, nullptr);
    if (r == -ENOMEM) {
      return false;
    } else if (r < 0) {
      MOZ_CRASH("ANativeWindow_lock failed.");
    }
    mIsLocked = true;
  }
  return true;
}

void
AndroidNativeWindowTextureData::Unlock()
{
  // The TextureClient may want to call Lock again before handing ownership
  // to the host, so we cannot call ANativeWindow_unlockAndPost yet.
}

void
AndroidNativeWindowTextureData::Forget(LayersIPCChannel*)
{
  MOZ_ASSERT(!mIsLocked, "ANativeWindow should not be released while locked.\n");
  ANativeWindow_release(mNativeWindow);
  mNativeWindow = nullptr;
  java::SurfaceAllocator::DisposeSurface(mSurface);
  mSurface = nullptr;
}

already_AddRefed<DrawTarget>
AndroidNativeWindowTextureData::BorrowDrawTarget()
{
  const int bpp = (mFormat == SurfaceFormat::R5G6B5_UINT16) ? 2 : 4;

  return gfx::Factory::CreateDrawTargetForData(
      gfx::BackendType::SKIA,
      static_cast<unsigned char*>(mBuffer.bits),
      IntSize(mBuffer.width, mBuffer.height),
      mBuffer.stride * bpp,
      mFormat,
      true);
}

void
AndroidNativeWindowTextureData::OnForwardedToHost()
{
  if (mIsLocked) {
    int32_t r = ANativeWindow_unlockAndPost(mNativeWindow);
    if (r < 0) {
      MOZ_CRASH("ANativeWindow_unlockAndPost failed\n.");
    }
    mIsLocked = false;
  }
}

#endif // MOZ_WIDGET_ANDROID

} // namespace layers
} // namespace mozilla