gecko-dev/gfx/layers/mlgpu/CanvasLayerMLGPU.cpp

/* -*- 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 "CanvasLayerMLGPU.h"
#include "composite/CompositableHost.h"  // for CompositableHost
#include "gfx2DGlue.h"                   // for ToFilter
#include "gfxEnv.h"                      // for gfxEnv, etc
#include "mozilla/gfx/Matrix.h"          // for Matrix4x4
#include "mozilla/gfx/Point.h"           // for Point
#include "mozilla/gfx/Rect.h"            // for Rect
#include "mozilla/layers/Compositor.h"   // for Compositor
#include "mozilla/layers/Effects.h"      // for EffectChain
#include "mozilla/layers/ImageHost.h"
#include "mozilla/mozalloc.h"  // for operator delete
#include "nsAString.h"
#include "mozilla/RefPtr.h"  // for nsRefPtr
#include "MaskOperation.h"
#include "nsISupportsImpl.h"  // for MOZ_COUNT_CTOR, etc
#include "nsString.h"         // for nsAutoCString

namespace mozilla {
namespace layers {

using namespace mozilla::gfx;

CanvasLayerMLGPU::CanvasLayerMLGPU(LayerManagerMLGPU* aManager)
    : CanvasLayer(aManager, nullptr), TexturedLayerMLGPU(aManager) {}

CanvasLayerMLGPU::~CanvasLayerMLGPU() { CleanupResources(); }

Layer* CanvasLayerMLGPU::GetLayer() { return this; }

gfx::SamplingFilter CanvasLayerMLGPU::GetSamplingFilter() {
  gfx::SamplingFilter filter = mSamplingFilter;
#ifdef ANDROID
  // Bug 691354
  // Using the LINEAR filter we get unexplained artifacts.
  // Use NEAREST when no scaling is required.
  Matrix matrix;
  bool is2D = GetEffectiveTransform().Is2D(&matrix);
  if (is2D && !ThebesMatrix(matrix).HasNonTranslationOrFlip()) {
    filter = SamplingFilter::POINT;
  }
#endif
  return filter;
}

void CanvasLayerMLGPU::PrintInfo(std::stringstream& aStream,
                                 const char* aPrefix) {
  CanvasLayer::PrintInfo(aStream, aPrefix);
  aStream << "\n";
  if (mHost && mHost->IsAttached()) {
    nsAutoCString pfx(aPrefix);
    pfx += "  ";
    mHost->PrintInfo(aStream, pfx.get());
  }
}

void CanvasLayerMLGPU::CleanupResources() {
  if (mHost) {
    mHost->Detach(this);
  }
  mTexture = nullptr;
  mBigImageTexture = nullptr;
  mHost = nullptr;
}

void CanvasLayerMLGPU::Disconnect() { CleanupResources(); }

void CanvasLayerMLGPU::ClearCachedResources() { CleanupResources(); }

void CanvasLayerMLGPU::SetRenderRegion(LayerIntRegion&& aRegion) {
  aRegion.AndWith(LayerIntRect::FromUnknownRect(mPictureRect));
  LayerMLGPU::SetRenderRegion(std::move(aRegion));
}

}  // namespace layers
}  // namespace mozilla