/* -*- 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 "X11BasicCompositor.h"

#include "gfxPlatform.h"

#include "gfx2DGlue.h"

#include "gfxXlibSurface.h"

#include "gfxImageSurface.h"

#include "mozilla/X11Util.h"

namespace mozilla {

using namespace mozilla::gfx;

namespace layers {

bool

X11DataTextureSourceBasic::Update(gfx::DataSourceSurface* aSurface,

                                  nsIntRegion* aDestRegion,

                                  gfx::IntPoint* aSrcOffset)

{

  // Reallocate our internal X11 surface if we don't have a DrawTarget yet,

  // or if we changed surface size or format since last update.

  if (!mBufferDrawTarget ||

      (aSurface->GetSize() != mBufferDrawTarget->GetSize()) ||

      (aSurface->GetFormat() != mBufferDrawTarget->GetFormat())) {

    RefPtr<gfxASurface> surf;

    gfxImageFormat imageFormat = SurfaceFormatToImageFormat(aSurface->GetFormat());

    Display *display = DefaultXDisplay();

    Screen *screen = DefaultScreenOfDisplay(display);

    XRenderPictFormat *xrenderFormat =

      gfxXlibSurface::FindRenderFormat(display, imageFormat);

    if (xrenderFormat) {

      surf = gfxXlibSurface::Create(screen, xrenderFormat,

                                    aSurface->GetSize());

    }

    if (!surf) {

      NS_WARNING("Couldn't create native surface, fallback to image surface");

      surf = new gfxImageSurface(aSurface->GetSize(), imageFormat);

    }

    mBufferDrawTarget = gfxPlatform::GetPlatform()->

      CreateDrawTargetForSurface(surf, aSurface->GetSize());

  }

  // Image contents have changed, upload to our DrawTarget

  // If aDestRegion is null, means we're updating the whole surface

  // Note : Incremental update with a source offset is only used on Mac.

  NS_ASSERTION(!aSrcOffset, "SrcOffset should not be used with linux OMTC basic");

  if (aDestRegion) {

    for (auto iter = aDestRegion->RectIter(); !iter.Done(); iter.Next()) {

      const IntRect& rect = iter.Get();

      IntRect srcRect(rect.X(), rect.Y(), rect.Width(), rect.Height());

      IntPoint dstPoint(rect.X(), rect.Y());

      // We're uploading regions to our buffer, so let's just copy contents over

      mBufferDrawTarget->CopySurface(aSurface, srcRect, dstPoint);

    }

  } else {

    // We're uploading the whole buffer, so let's just copy the full surface

    IntSize size = aSurface->GetSize();

    mBufferDrawTarget->CopySurface(aSurface, IntRect(0, 0, size.width, size.height),

                                   IntPoint(0, 0));

  }

  return true;

}

TextureSourceBasic*

X11DataTextureSourceBasic::AsSourceBasic()

{

  return this;

}

IntSize

X11DataTextureSourceBasic::GetSize() const

{

  if (!mBufferDrawTarget) {

    NS_WARNING("Trying to query the size of an uninitialized TextureSource");

    return IntSize(0, 0);

  }

  return mBufferDrawTarget->GetSize();

}

gfx::SurfaceFormat

X11DataTextureSourceBasic::GetFormat() const

{

  if (!mBufferDrawTarget) {

    NS_WARNING("Trying to query the format of an uninitialized TextureSource");

    return gfx::SurfaceFormat::UNKNOWN;

  }

  return mBufferDrawTarget->GetFormat();

}

SourceSurface*

X11DataTextureSourceBasic::GetSurface(DrawTarget* aTarget)

{

  RefPtr<gfx::SourceSurface> surface;

  if (mBufferDrawTarget) {

    surface = mBufferDrawTarget->Snapshot();

    return surface.get();

  }

  return nullptr;

}

void

X11DataTextureSourceBasic::DeallocateDeviceData()

{

  mBufferDrawTarget = nullptr;

}

already_AddRefed<DataTextureSource>

X11BasicCompositor::CreateDataTextureSource(TextureFlags aFlags)

{

  RefPtr<DataTextureSource> result =

    new X11DataTextureSourceBasic();

  return result.forget();

}

void

X11BasicCompositor::EndFrame()

{

  BasicCompositor::EndFrame();

  XFlush(DefaultXDisplay());

}

} // namespace layers

} // namespace mozilla