/* -*- 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 "ImageLayerMLGPU.h"

#include "LayerManagerMLGPU.h"

namespace mozilla {

using namespace gfx;

namespace layers {

ImageLayerMLGPU::ImageLayerMLGPU(LayerManagerMLGPU* aManager)

  : ImageLayer(aManager, static_cast<HostLayer*>(this))

  , TexturedLayerMLGPU(aManager)

{

}

ImageLayerMLGPU::~ImageLayerMLGPU()

{

  CleanupResources();

}

void

ImageLayerMLGPU::ComputeEffectiveTransforms(const gfx::Matrix4x4& aTransformToSurface)

{

  Matrix4x4 local = GetLocalTransform();

  // Snap image edges to pixel boundaries.

  gfxRect sourceRect(0, 0, 0, 0);

  if (mHost && mHost->IsAttached()) {

    IntSize size = mHost->GetImageSize();

    sourceRect.SizeTo(size.width, size.height);

  }

  // Snap our local transform first, and snap the inherited transform as well.

  // This makes our snapping equivalent to what would happen if our content

  // was drawn into a PaintedLayer (gfxContext would snap using the local

  // transform, then we'd snap again when compositing the PaintedLayer).

  mEffectiveTransform =

      SnapTransform(local, sourceRect, nullptr) *

      SnapTransformTranslation(aTransformToSurface, nullptr);

  mEffectiveTransformForBuffer = mEffectiveTransform;

  if (mScaleMode == ScaleMode::STRETCH &&

      mScaleToSize.width != 0.0 &&

      mScaleToSize.height != 0.0)

  {

    Size scale(sourceRect.Width() / mScaleToSize.width,

               sourceRect.Height() / mScaleToSize.height);

    mScale = Some(scale);

  }

  ComputeEffectiveTransformForMaskLayers(aTransformToSurface);

}

gfx::SamplingFilter

ImageLayerMLGPU::GetSamplingFilter()

{

  return ImageLayer::GetSamplingFilter();

}

bool

ImageLayerMLGPU::IsContentOpaque()

{

  if (mPictureRect.Width() == 0 || mPictureRect.Height() == 0) {

    return false;

  }

  if (mScaleMode == ScaleMode::STRETCH) {

    return gfx::IsOpaque(mHost->CurrentTextureHost()->GetFormat());

  }

  return false;

}

void

ImageLayerMLGPU::SetRenderRegion(LayerIntRegion&& aRegion)

{

  switch (mScaleMode) {

  case ScaleMode::STRETCH:

    // See bug 1264142.

    aRegion.AndWith(LayerIntRect(0, 0, mScaleToSize.width, mScaleToSize.height));

    break;

  default:

    // Clamp the visible region to the texture size. (see bug 1396507)

    MOZ_ASSERT(mScaleMode == ScaleMode::SCALE_NONE);

    aRegion.AndWith(LayerIntRect(0, 0, mPictureRect.Width(), mPictureRect.Height()));

    break;

  }

  LayerMLGPU::SetRenderRegion(std::move(aRegion));

}

void

ImageLayerMLGPU::CleanupResources()

{

  if (mHost) {

    mHost->CleanupResources();

    mHost->Detach(this);

  }

  mTexture = nullptr;

  mBigImageTexture = nullptr;

  mHost = nullptr;

}

void

ImageLayerMLGPU::PrintInfo(std::stringstream& aStream, const char* aPrefix)

{

  ImageLayer::PrintInfo(aStream, aPrefix);

  if (mHost && mHost->IsAttached()) {

    aStream << "\n";

    nsAutoCString pfx(aPrefix);

    pfx += "  ";

    mHost->PrintInfo(aStream, pfx.get());

  }

}

void

ImageLayerMLGPU::Disconnect()

{

  CleanupResources();

}

void

ImageLayerMLGPU::ClearCachedResources()

{

  CleanupResources();

}

} // namespace layers

} // namespace mozilla