/* -*- 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 "mozilla/layers/TextureClientX11.h"

#include "mozilla/layers/CompositableClient.h"
#include "mozilla/layers/CompositableForwarder.h"
#include "mozilla/layers/ISurfaceAllocator.h"
#include "mozilla/layers/ShadowLayerUtilsX11.h"
#include "mozilla/layers/TextureForwarder.h"
#include "mozilla/gfx/2D.h"
#include "mozilla/gfx/Logging.h"
#include "gfx2DGlue.h"
#include "gfxPlatform.h"
#include "gfxXlibSurface.h"

#include "mozilla/X11Util.h"
#include <X11/Xlib.h>

using namespace mozilla;
using namespace mozilla::gfx;

namespace mozilla::layers {

X11TextureData::X11TextureData(gfx::IntSize aSize, gfx::SurfaceFormat aFormat,
                               bool aClientDeallocation, bool aIsCrossProcess,
                               gfxXlibSurface* aSurface)
    : mSize(aSize),
      mFormat(aFormat),
      mSurface(aSurface),
      mClientDeallocation(aClientDeallocation),
      mIsCrossProcess(aIsCrossProcess) {
  MOZ_ASSERT(mSurface);
}

bool X11TextureData::Lock(OpenMode aMode) { return true; }

void X11TextureData::Unlock() {
  if (mSurface && mIsCrossProcess) {
    FinishX(DefaultXDisplay());
  }
}

void X11TextureData::FillInfo(TextureData::Info& aInfo) const {
  aInfo.size = mSize;
  aInfo.format = mFormat;
  aInfo.supportsMoz2D = true;
  aInfo.hasIntermediateBuffer = false;
  aInfo.hasSynchronization = false;
  aInfo.canExposeMappedData = false;
}

bool X11TextureData::Serialize(SurfaceDescriptor& aOutDescriptor) {
  MOZ_ASSERT(mSurface);
  if (!mSurface) {
    return false;
  }

  if (!mClientDeallocation) {
    // Pass to the host the responsibility of freeing the pixmap. ReleasePixmap
    // means the underlying pixmap will not be deallocated in mSurface's
    // destructor. ToSurfaceDescriptor is at most called once per TextureClient.
    mSurface->ReleasePixmap();
  }

  aOutDescriptor = SurfaceDescriptorX11(mSurface);
  return true;
}

already_AddRefed<gfx::DrawTarget> X11TextureData::BorrowDrawTarget() {
  MOZ_ASSERT(mSurface);
  if (!mSurface) {
    return nullptr;
  }

  IntSize size = mSurface->GetSize();
  RefPtr<gfx::DrawTarget> dt =
      Factory::CreateDrawTargetForCairoSurface(mSurface->CairoSurface(), size);

  return dt.forget();
}

bool X11TextureData::UpdateFromSurface(gfx::SourceSurface* aSurface) {
  RefPtr<DrawTarget> dt = BorrowDrawTarget();

  if (!dt) {
    return false;
  }

  dt->CopySurface(aSurface, IntRect(IntPoint(), aSurface->GetSize()),
                  IntPoint());

  return true;
}

void X11TextureData::Deallocate(LayersIPCChannel*) { mSurface = nullptr; }

TextureData* X11TextureData::CreateSimilar(
    LayersIPCChannel* aAllocator, LayersBackend aLayersBackend,
    TextureFlags aFlags, TextureAllocationFlags aAllocFlags) const {
  return X11TextureData::Create(mSize, mFormat, aFlags, aAllocator);
}

X11TextureData* X11TextureData::Create(gfx::IntSize aSize,
                                       gfx::SurfaceFormat aFormat,
                                       TextureFlags aFlags,
                                       LayersIPCChannel* aAllocator) {
  MOZ_ASSERT(aSize.width >= 0 && aSize.height >= 0);
  if (aSize.width <= 0 || aSize.height <= 0 ||
      aSize.width > XLIB_IMAGE_SIDE_SIZE_LIMIT ||
      aSize.height > XLIB_IMAGE_SIDE_SIZE_LIMIT) {
    gfxDebug() << "Asking for X11 surface of invalid size " << aSize.width
               << "x" << aSize.height;
    return nullptr;
  }
  gfxImageFormat imageFormat = SurfaceFormatToImageFormat(aFormat);
  RefPtr<gfxASurface> surface =
      gfxPlatform::GetPlatform()->CreateOffscreenSurface(aSize, imageFormat);
  if (!surface || surface->GetType() != gfxSurfaceType::Xlib) {
    NS_ERROR("creating Xlib surface failed!");
    return nullptr;
  }

  gfxXlibSurface* xlibSurface = static_cast<gfxXlibSurface*>(surface.get());

  bool crossProcess = !aAllocator->IsSameProcess();
  X11TextureData* texture = new X11TextureData(
      aSize, aFormat, !!(aFlags & TextureFlags::DEALLOCATE_CLIENT),
      crossProcess, xlibSurface);
  if (crossProcess) {
    FinishX(DefaultXDisplay());
  }

  return texture;
}

}  // namespace mozilla::layers