gecko-dev/gfx/2d/FilterNodeCapture.h

/* -*- 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/. */

#ifndef MOZILLA_GFX_FILTERNODECAPTURE_H_
#define MOZILLA_GFX_FILTERNODECAPTURE_H_

#include "2D.h"
#include "Filters.h"
#include <unordered_map>
#include <vector>
#include "mozilla/Variant.h"

namespace mozilla {
namespace gfx {

class FilterNodeCapture final : public FilterNode
{
public:
  MOZ_DECLARE_REFCOUNTED_VIRTUAL_TYPENAME(FilterNodeCapture, override)

  explicit FilterNodeCapture(FilterType aType)
    : mType{aType}
    , mInputsChanged{true}
  {
  }

  virtual FilterBackend GetBackendType() override { return FILTER_BACKEND_CAPTURE; }

  RefPtr<FilterNode> Validate(DrawTarget* aDT);

  template<typename T, typename C>
  void Replace(uint32_t aIndex, const T& aValue, C& aContainer)
  {
    // This replace function avoids generating the hash twice.
    auto result = aContainer.insert({ aIndex, typename C::mapped_type(aValue) });
    if (!result.second) {
      result.first->second = typename C::mapped_type(aValue);
    }
  }

  virtual void SetInput(uint32_t aIndex, SourceSurface *aSurface) override
  {
    mInputsChanged = true;
    Replace(aIndex, RefPtr<SourceSurface>(aSurface), mInputs);
  }
  virtual void SetInput(uint32_t aIndex, FilterNode *aFilter) override
  {
    mInputsChanged = true;
    Replace(aIndex, RefPtr<FilterNode>(aFilter), mInputs);
  }

  using AttributeValue = Variant<
    uint32_t,
    Float,
    Point,
    Matrix5x4,
    Point3D,
    Size,
    IntSize,
    Color,
    Rect,
    IntRect,
    bool,
    std::vector<Float>,
    IntPoint,
    Matrix
  >;

  virtual void SetAttribute(uint32_t aIndex, uint32_t aValue) override { Replace(aIndex, aValue, mAttributes); }
  virtual void SetAttribute(uint32_t aIndex, Float aValue) override { Replace(aIndex, aValue, mAttributes); }
  virtual void SetAttribute(uint32_t aIndex, const Point &aValue) override { Replace(aIndex, aValue, mAttributes); }
  virtual void SetAttribute(uint32_t aIndex, const Matrix5x4 &aValue) override { Replace(aIndex, aValue, mAttributes); }
  virtual void SetAttribute(uint32_t aIndex, const Point3D &aValue) override { Replace(aIndex, aValue, mAttributes); }
  virtual void SetAttribute(uint32_t aIndex, const Size &aValue) override { Replace(aIndex, aValue, mAttributes); }
  virtual void SetAttribute(uint32_t aIndex, const IntSize &aValue) override { Replace(aIndex, aValue, mAttributes); }
  virtual void SetAttribute(uint32_t aIndex, const Color &aValue) override { Replace(aIndex, aValue, mAttributes); }
  virtual void SetAttribute(uint32_t aIndex, const Rect &aValue) override { Replace(aIndex, aValue, mAttributes); }
  virtual void SetAttribute(uint32_t aIndex, const IntRect &aValue) override { Replace(aIndex, aValue, mAttributes); }
  virtual void SetAttribute(uint32_t aIndex, bool aValue) override { Replace(aIndex, aValue, mAttributes); }
  virtual void SetAttribute(uint32_t aIndex, const Float *aValues, uint32_t aSize) override;
  virtual void SetAttribute(uint32_t aIndex, const IntPoint &aValue) override { Replace(aIndex, aValue, mAttributes); }
  virtual void SetAttribute(uint32_t aIndex, const Matrix &aValue) override { Replace(aIndex, aValue, mAttributes); }

private:
  FilterType mType;
  RefPtr<FilterNode> mFilterNodeInternal;

  // This only contains attributes that were set since the last validation.
  std::unordered_map<uint32_t, AttributeValue> mAttributes;

  // This always contains all inputs, so that Validate may be called on input
  // filter nodes.
  std::unordered_map<uint32_t, Variant<RefPtr<SourceSurface>, RefPtr<FilterNode>>> mInputs;
  
  // This is true if SetInput was called since the last validation.
  bool mInputsChanged;
};

}
}

#endif