gecko/gfx/2d/FilterNodeD2D1.cpp

/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 * 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 "FilterNodeD2D1.h"

#include "Logging.h"

#include "SourceSurfaceD2D1.h"
#include "SourceSurfaceD2D.h"
#include "SourceSurfaceD2DTarget.h"
#include "DrawTargetD2D.h"
#include "DrawTargetD2D1.h"

namespace mozilla {
namespace gfx {

D2D1_COLORMATRIX_ALPHA_MODE D2DAlphaMode(uint32_t aMode)
{
  switch (aMode) {
  case ALPHA_MODE_PREMULTIPLIED:
    return D2D1_COLORMATRIX_ALPHA_MODE_PREMULTIPLIED;
  case ALPHA_MODE_STRAIGHT:
    return D2D1_COLORMATRIX_ALPHA_MODE_STRAIGHT;
  default:
    MOZ_CRASH("Unknown enum value!");
  }

  return D2D1_COLORMATRIX_ALPHA_MODE_PREMULTIPLIED;
}

D2D1_2DAFFINETRANSFORM_INTERPOLATION_MODE D2DAffineTransformInterpolationMode(Filter aFilter)
{
  switch (aFilter) {
  case Filter::GOOD:
    return D2D1_2DAFFINETRANSFORM_INTERPOLATION_MODE_LINEAR;
  case Filter::LINEAR:
    return D2D1_2DAFFINETRANSFORM_INTERPOLATION_MODE_LINEAR;
  case Filter::POINT:
    return D2D1_2DAFFINETRANSFORM_INTERPOLATION_MODE_NEAREST_NEIGHBOR;
  default:
    MOZ_CRASH("Unknown enum value!");
  }

  return D2D1_2DAFFINETRANSFORM_INTERPOLATION_MODE_LINEAR;
}

D2D1_BLEND_MODE D2DBlendMode(uint32_t aMode)
{
  switch (aMode) {
  case BLEND_MODE_DARKEN:
    return D2D1_BLEND_MODE_DARKEN;
  case BLEND_MODE_LIGHTEN:
    return D2D1_BLEND_MODE_LIGHTEN;
  case BLEND_MODE_MULTIPLY:
    return D2D1_BLEND_MODE_MULTIPLY;
  case BLEND_MODE_SCREEN:
    return D2D1_BLEND_MODE_SCREEN;
  case BLEND_MODE_OVERLAY:
    return D2D1_BLEND_MODE_OVERLAY;
  case BLEND_MODE_COLOR_DODGE:
    return D2D1_BLEND_MODE_COLOR_DODGE;
  case BLEND_MODE_COLOR_BURN:
    return D2D1_BLEND_MODE_COLOR_BURN;
  case BLEND_MODE_HARD_LIGHT:
    return D2D1_BLEND_MODE_HARD_LIGHT;
  case BLEND_MODE_SOFT_LIGHT:
    return D2D1_BLEND_MODE_SOFT_LIGHT;
  case BLEND_MODE_DIFFERENCE:
    return D2D1_BLEND_MODE_DIFFERENCE;
  case BLEND_MODE_EXCLUSION:
    return D2D1_BLEND_MODE_EXCLUSION;
  case BLEND_MODE_HUE:
    return D2D1_BLEND_MODE_HUE;
  case BLEND_MODE_SATURATION:
    return D2D1_BLEND_MODE_SATURATION;
  case BLEND_MODE_COLOR:
    return D2D1_BLEND_MODE_COLOR;
  case BLEND_MODE_LUMINOSITY:
    return D2D1_BLEND_MODE_LUMINOSITY;

  default:
    MOZ_CRASH("Unknown enum value!");
  }

  return D2D1_BLEND_MODE_DARKEN;
}

D2D1_MORPHOLOGY_MODE D2DMorphologyMode(uint32_t aMode)
{
  switch (aMode) {
  case MORPHOLOGY_OPERATOR_DILATE:
    return D2D1_MORPHOLOGY_MODE_DILATE;
  case MORPHOLOGY_OPERATOR_ERODE:
    return D2D1_MORPHOLOGY_MODE_ERODE;
  }

  MOZ_CRASH("Unknown enum value!");
  return D2D1_MORPHOLOGY_MODE_DILATE;
}

D2D1_TURBULENCE_NOISE D2DTurbulenceNoise(uint32_t aMode)
{
  switch (aMode) {
  case TURBULENCE_TYPE_FRACTAL_NOISE:
    return D2D1_TURBULENCE_NOISE_FRACTAL_SUM;
  case TURBULENCE_TYPE_TURBULENCE:
    return D2D1_TURBULENCE_NOISE_TURBULENCE;
  }

  MOZ_CRASH("Unknown enum value!");
  return D2D1_TURBULENCE_NOISE_TURBULENCE;
}

D2D1_COMPOSITE_MODE D2DFilterCompositionMode(uint32_t aMode)
{
  switch (aMode) {
  case COMPOSITE_OPERATOR_OVER:
    return D2D1_COMPOSITE_MODE_SOURCE_OVER;
  case COMPOSITE_OPERATOR_IN:
    return D2D1_COMPOSITE_MODE_SOURCE_IN;
  case COMPOSITE_OPERATOR_OUT:
    return D2D1_COMPOSITE_MODE_SOURCE_OUT;
  case COMPOSITE_OPERATOR_ATOP:
    return D2D1_COMPOSITE_MODE_SOURCE_ATOP;
  case COMPOSITE_OPERATOR_XOR:
    return D2D1_COMPOSITE_MODE_XOR;
  }

  MOZ_CRASH("Unknown enum value!");
  return D2D1_COMPOSITE_MODE_SOURCE_OVER;
}

D2D1_CHANNEL_SELECTOR D2DChannelSelector(uint32_t aMode)
{
  switch (aMode) {
  case COLOR_CHANNEL_R:
    return D2D1_CHANNEL_SELECTOR_R;
  case COLOR_CHANNEL_G:
    return D2D1_CHANNEL_SELECTOR_G;
  case COLOR_CHANNEL_B:
    return D2D1_CHANNEL_SELECTOR_B;
  case COLOR_CHANNEL_A:
    return D2D1_CHANNEL_SELECTOR_A;
  }

  MOZ_CRASH("Unknown enum value!");
  return D2D1_CHANNEL_SELECTOR_R;
}

TemporaryRef<ID2D1Image> GetImageForSourceSurface(DrawTarget *aDT, SourceSurface *aSurface)
{
  if (aDT->IsTiledDrawTarget() || aDT->IsDualDrawTarget()) {
      MOZ_CRASH("Incompatible draw target type!");
      return nullptr;
  }
  switch (aDT->GetBackendType()) {
    case BackendType::DIRECT2D1_1:
      return static_cast<DrawTargetD2D1*>(aDT)->GetImageForSurface(aSurface, ExtendMode::CLAMP);
    case BackendType::DIRECT2D:
      return static_cast<DrawTargetD2D*>(aDT)->GetImageForSurface(aSurface);
    default:
      MOZ_CRASH("Unknown draw target type!");
      return nullptr;
  }
}

uint32_t ConvertValue(FilterType aType, uint32_t aAttribute, uint32_t aValue)
{
  switch (aType) {
  case FilterType::COLOR_MATRIX:
    if (aAttribute == ATT_COLOR_MATRIX_ALPHA_MODE) {
      aValue = D2DAlphaMode(aValue);
    }
    break;
  case FilterType::TRANSFORM:
    if (aAttribute == ATT_TRANSFORM_FILTER) {
      aValue = D2DAffineTransformInterpolationMode(Filter(aValue));
    }
    break;
  case FilterType::BLEND:
    if (aAttribute == ATT_BLEND_BLENDMODE) {
      aValue = D2DBlendMode(aValue);
    }
    break;
  case FilterType::MORPHOLOGY:
    if (aAttribute == ATT_MORPHOLOGY_OPERATOR) {
      aValue = D2DMorphologyMode(aValue);
    }
    break;
  case FilterType::DISPLACEMENT_MAP:
    if (aAttribute == ATT_DISPLACEMENT_MAP_X_CHANNEL ||
        aAttribute == ATT_DISPLACEMENT_MAP_Y_CHANNEL) {
      aValue = D2DChannelSelector(aValue);
    }
    break;
  case FilterType::TURBULENCE:
    if (aAttribute == ATT_TURBULENCE_TYPE) {
      aValue = D2DTurbulenceNoise(aValue);
    }
    break;
  case FilterType::COMPOSITE:
    if (aAttribute == ATT_COMPOSITE_OPERATOR) {
      aValue = D2DFilterCompositionMode(aValue);
    }
    break;
  }

  return aValue;
}

void ConvertValue(FilterType aType, uint32_t aAttribute, IntSize &aValue)
{
  switch (aType) {
  case FilterType::MORPHOLOGY:
    if (aAttribute == ATT_MORPHOLOGY_RADII) {
      aValue.width *= 2;
      aValue.width += 1;
      aValue.height *= 2;
      aValue.height += 1;
    }
    break;
  }
}

UINT32
GetD2D1InputForInput(FilterType aType, uint32_t aIndex)
{
  return aIndex;
}

#define CONVERT_PROP(moz2dname, d2dname) \
  case ATT_##moz2dname: \
  return D2D1_##d2dname

UINT32
GetD2D1PropForAttribute(FilterType aType, uint32_t aIndex)
{
  switch (aType) {
  case FilterType::COLOR_MATRIX:
    switch (aIndex) {
      CONVERT_PROP(COLOR_MATRIX_MATRIX, COLORMATRIX_PROP_COLOR_MATRIX);
      CONVERT_PROP(COLOR_MATRIX_ALPHA_MODE, COLORMATRIX_PROP_ALPHA_MODE);
    }
    break;
  case FilterType::TRANSFORM:
    switch (aIndex) {
      CONVERT_PROP(TRANSFORM_MATRIX, 2DAFFINETRANSFORM_PROP_TRANSFORM_MATRIX);
      CONVERT_PROP(TRANSFORM_FILTER, 2DAFFINETRANSFORM_PROP_INTERPOLATION_MODE);
    }
  case FilterType::BLEND:
    switch (aIndex) {
      CONVERT_PROP(BLEND_BLENDMODE, BLEND_PROP_MODE);
    }
    break;
  case FilterType::MORPHOLOGY:
    switch (aIndex) {
      CONVERT_PROP(MORPHOLOGY_OPERATOR, MORPHOLOGY_PROP_MODE);
    }
    break;
  case FilterType::FLOOD:
    switch (aIndex) {
      CONVERT_PROP(FLOOD_COLOR, FLOOD_PROP_COLOR);
    }
    break;
  case FilterType::TILE:
    switch (aIndex) {
      CONVERT_PROP(TILE_SOURCE_RECT, TILE_PROP_RECT);
    }
    break;
  case FilterType::TABLE_TRANSFER:
    switch (aIndex) {
      CONVERT_PROP(TABLE_TRANSFER_DISABLE_R, TABLETRANSFER_PROP_RED_DISABLE);
      CONVERT_PROP(TABLE_TRANSFER_DISABLE_G, TABLETRANSFER_PROP_GREEN_DISABLE);
      CONVERT_PROP(TABLE_TRANSFER_DISABLE_B, TABLETRANSFER_PROP_BLUE_DISABLE);
      CONVERT_PROP(TABLE_TRANSFER_DISABLE_A, TABLETRANSFER_PROP_ALPHA_DISABLE);
      CONVERT_PROP(TABLE_TRANSFER_TABLE_R, TABLETRANSFER_PROP_RED_TABLE);
      CONVERT_PROP(TABLE_TRANSFER_TABLE_G, TABLETRANSFER_PROP_GREEN_TABLE);
      CONVERT_PROP(TABLE_TRANSFER_TABLE_B, TABLETRANSFER_PROP_BLUE_TABLE);
      CONVERT_PROP(TABLE_TRANSFER_TABLE_A, TABLETRANSFER_PROP_ALPHA_TABLE);
    }
    break;
  case FilterType::DISCRETE_TRANSFER:
    switch (aIndex) {
      CONVERT_PROP(DISCRETE_TRANSFER_DISABLE_R, DISCRETETRANSFER_PROP_RED_DISABLE);
      CONVERT_PROP(DISCRETE_TRANSFER_DISABLE_G, DISCRETETRANSFER_PROP_GREEN_DISABLE);
      CONVERT_PROP(DISCRETE_TRANSFER_DISABLE_B, DISCRETETRANSFER_PROP_BLUE_DISABLE);
      CONVERT_PROP(DISCRETE_TRANSFER_DISABLE_A, DISCRETETRANSFER_PROP_ALPHA_DISABLE);
      CONVERT_PROP(DISCRETE_TRANSFER_TABLE_R, DISCRETETRANSFER_PROP_RED_TABLE);
      CONVERT_PROP(DISCRETE_TRANSFER_TABLE_G, DISCRETETRANSFER_PROP_GREEN_TABLE);
      CONVERT_PROP(DISCRETE_TRANSFER_TABLE_B, DISCRETETRANSFER_PROP_BLUE_TABLE);
      CONVERT_PROP(DISCRETE_TRANSFER_TABLE_A, DISCRETETRANSFER_PROP_ALPHA_TABLE);
    }
    break;
  case FilterType::LINEAR_TRANSFER:
    switch (aIndex) {
      CONVERT_PROP(LINEAR_TRANSFER_DISABLE_R, LINEARTRANSFER_PROP_RED_DISABLE);
      CONVERT_PROP(LINEAR_TRANSFER_DISABLE_G, LINEARTRANSFER_PROP_GREEN_DISABLE);
      CONVERT_PROP(LINEAR_TRANSFER_DISABLE_B, LINEARTRANSFER_PROP_BLUE_DISABLE);
      CONVERT_PROP(LINEAR_TRANSFER_DISABLE_A, LINEARTRANSFER_PROP_ALPHA_DISABLE);
      CONVERT_PROP(LINEAR_TRANSFER_INTERCEPT_R, LINEARTRANSFER_PROP_RED_Y_INTERCEPT);
      CONVERT_PROP(LINEAR_TRANSFER_INTERCEPT_G, LINEARTRANSFER_PROP_GREEN_Y_INTERCEPT);
      CONVERT_PROP(LINEAR_TRANSFER_INTERCEPT_B, LINEARTRANSFER_PROP_BLUE_Y_INTERCEPT);
      CONVERT_PROP(LINEAR_TRANSFER_INTERCEPT_A, LINEARTRANSFER_PROP_ALPHA_Y_INTERCEPT);
      CONVERT_PROP(LINEAR_TRANSFER_SLOPE_R, LINEARTRANSFER_PROP_RED_SLOPE);
      CONVERT_PROP(LINEAR_TRANSFER_SLOPE_G, LINEARTRANSFER_PROP_GREEN_SLOPE);
      CONVERT_PROP(LINEAR_TRANSFER_SLOPE_B, LINEARTRANSFER_PROP_BLUE_SLOPE);
      CONVERT_PROP(LINEAR_TRANSFER_SLOPE_A, LINEARTRANSFER_PROP_ALPHA_SLOPE);
    }
    break;
  case FilterType::GAMMA_TRANSFER:
    switch (aIndex) {
      CONVERT_PROP(GAMMA_TRANSFER_DISABLE_R, GAMMATRANSFER_PROP_RED_DISABLE);
      CONVERT_PROP(GAMMA_TRANSFER_DISABLE_G, GAMMATRANSFER_PROP_GREEN_DISABLE);
      CONVERT_PROP(GAMMA_TRANSFER_DISABLE_B, GAMMATRANSFER_PROP_BLUE_DISABLE);
      CONVERT_PROP(GAMMA_TRANSFER_DISABLE_A, GAMMATRANSFER_PROP_ALPHA_DISABLE);
      CONVERT_PROP(GAMMA_TRANSFER_AMPLITUDE_R, GAMMATRANSFER_PROP_RED_AMPLITUDE);
      CONVERT_PROP(GAMMA_TRANSFER_AMPLITUDE_G, GAMMATRANSFER_PROP_GREEN_AMPLITUDE);
      CONVERT_PROP(GAMMA_TRANSFER_AMPLITUDE_B, GAMMATRANSFER_PROP_BLUE_AMPLITUDE);
      CONVERT_PROP(GAMMA_TRANSFER_AMPLITUDE_A, GAMMATRANSFER_PROP_ALPHA_AMPLITUDE);
      CONVERT_PROP(GAMMA_TRANSFER_EXPONENT_R, GAMMATRANSFER_PROP_RED_EXPONENT);
      CONVERT_PROP(GAMMA_TRANSFER_EXPONENT_G, GAMMATRANSFER_PROP_GREEN_EXPONENT);
      CONVERT_PROP(GAMMA_TRANSFER_EXPONENT_B, GAMMATRANSFER_PROP_BLUE_EXPONENT);
      CONVERT_PROP(GAMMA_TRANSFER_EXPONENT_A, GAMMATRANSFER_PROP_ALPHA_EXPONENT);
      CONVERT_PROP(GAMMA_TRANSFER_OFFSET_R, GAMMATRANSFER_PROP_RED_OFFSET);
      CONVERT_PROP(GAMMA_TRANSFER_OFFSET_G, GAMMATRANSFER_PROP_GREEN_OFFSET);
      CONVERT_PROP(GAMMA_TRANSFER_OFFSET_B, GAMMATRANSFER_PROP_BLUE_OFFSET);
      CONVERT_PROP(GAMMA_TRANSFER_OFFSET_A, GAMMATRANSFER_PROP_ALPHA_OFFSET);
    }
    break;
  case FilterType::CONVOLVE_MATRIX:
    switch (aIndex) {
      CONVERT_PROP(CONVOLVE_MATRIX_BIAS, CONVOLVEMATRIX_PROP_BIAS);
      CONVERT_PROP(CONVOLVE_MATRIX_KERNEL_MATRIX, CONVOLVEMATRIX_PROP_KERNEL_MATRIX);
      CONVERT_PROP(CONVOLVE_MATRIX_DIVISOR, CONVOLVEMATRIX_PROP_DIVISOR);
      CONVERT_PROP(CONVOLVE_MATRIX_KERNEL_UNIT_LENGTH, CONVOLVEMATRIX_PROP_KERNEL_UNIT_LENGTH);
      CONVERT_PROP(CONVOLVE_MATRIX_PRESERVE_ALPHA, CONVOLVEMATRIX_PROP_PRESERVE_ALPHA);
    }
  case FilterType::DISPLACEMENT_MAP:
    switch (aIndex) {
      CONVERT_PROP(DISPLACEMENT_MAP_SCALE, DISPLACEMENTMAP_PROP_SCALE);
      CONVERT_PROP(DISPLACEMENT_MAP_X_CHANNEL, DISPLACEMENTMAP_PROP_X_CHANNEL_SELECT);
      CONVERT_PROP(DISPLACEMENT_MAP_Y_CHANNEL, DISPLACEMENTMAP_PROP_Y_CHANNEL_SELECT);
    }
    break;
  case FilterType::TURBULENCE:
    switch (aIndex) {
      CONVERT_PROP(TURBULENCE_BASE_FREQUENCY, TURBULENCE_PROP_BASE_FREQUENCY);
      CONVERT_PROP(TURBULENCE_NUM_OCTAVES, TURBULENCE_PROP_NUM_OCTAVES);
      CONVERT_PROP(TURBULENCE_SEED, TURBULENCE_PROP_SEED);
      CONVERT_PROP(TURBULENCE_STITCHABLE, TURBULENCE_PROP_STITCHABLE);
      CONVERT_PROP(TURBULENCE_TYPE, TURBULENCE_PROP_NOISE);
    }
    break;
  case FilterType::ARITHMETIC_COMBINE:
    switch (aIndex) {
      CONVERT_PROP(ARITHMETIC_COMBINE_COEFFICIENTS, ARITHMETICCOMPOSITE_PROP_COEFFICIENTS);
    }
    break;
  case FilterType::COMPOSITE:
    switch (aIndex) {
      CONVERT_PROP(COMPOSITE_OPERATOR, COMPOSITE_PROP_MODE);
    }
    break;
  case FilterType::GAUSSIAN_BLUR:
    switch (aIndex) {
      CONVERT_PROP(GAUSSIAN_BLUR_STD_DEVIATION, GAUSSIANBLUR_PROP_STANDARD_DEVIATION);
    }
    break;
  case FilterType::DIRECTIONAL_BLUR:
    switch (aIndex) {
      CONVERT_PROP(DIRECTIONAL_BLUR_STD_DEVIATION, DIRECTIONALBLUR_PROP_STANDARD_DEVIATION);
      CONVERT_PROP(DIRECTIONAL_BLUR_DIRECTION, DIRECTIONALBLUR_PROP_ANGLE);
    }
    break;
  case FilterType::POINT_DIFFUSE:
    switch (aIndex) {
      CONVERT_PROP(POINT_DIFFUSE_DIFFUSE_CONSTANT, POINTDIFFUSE_PROP_DIFFUSE_CONSTANT);
      CONVERT_PROP(POINT_DIFFUSE_POSITION, POINTDIFFUSE_PROP_LIGHT_POSITION);
      CONVERT_PROP(POINT_DIFFUSE_COLOR, POINTDIFFUSE_PROP_COLOR);
      CONVERT_PROP(POINT_DIFFUSE_SURFACE_SCALE, POINTDIFFUSE_PROP_SURFACE_SCALE);
      CONVERT_PROP(POINT_DIFFUSE_KERNEL_UNIT_LENGTH, POINTDIFFUSE_PROP_KERNEL_UNIT_LENGTH);
    }
    break;
  case FilterType::SPOT_DIFFUSE:
    switch (aIndex) {
      CONVERT_PROP(SPOT_DIFFUSE_DIFFUSE_CONSTANT, SPOTDIFFUSE_PROP_DIFFUSE_CONSTANT);
      CONVERT_PROP(SPOT_DIFFUSE_POINTS_AT, SPOTDIFFUSE_PROP_POINTS_AT);
      CONVERT_PROP(SPOT_DIFFUSE_FOCUS, SPOTDIFFUSE_PROP_FOCUS);
      CONVERT_PROP(SPOT_DIFFUSE_LIMITING_CONE_ANGLE, SPOTDIFFUSE_PROP_LIMITING_CONE_ANGLE);
      CONVERT_PROP(SPOT_DIFFUSE_POSITION, SPOTDIFFUSE_PROP_LIGHT_POSITION);
      CONVERT_PROP(SPOT_DIFFUSE_COLOR, SPOTDIFFUSE_PROP_COLOR);
      CONVERT_PROP(SPOT_DIFFUSE_SURFACE_SCALE, SPOTDIFFUSE_PROP_SURFACE_SCALE);
      CONVERT_PROP(SPOT_DIFFUSE_KERNEL_UNIT_LENGTH, SPOTDIFFUSE_PROP_KERNEL_UNIT_LENGTH);
    }
    break;
  case FilterType::DISTANT_DIFFUSE:
    switch (aIndex) {
      CONVERT_PROP(DISTANT_DIFFUSE_DIFFUSE_CONSTANT, DISTANTDIFFUSE_PROP_DIFFUSE_CONSTANT);
      CONVERT_PROP(DISTANT_DIFFUSE_AZIMUTH, DISTANTDIFFUSE_PROP_AZIMUTH);
      CONVERT_PROP(DISTANT_DIFFUSE_ELEVATION, DISTANTDIFFUSE_PROP_ELEVATION);
      CONVERT_PROP(DISTANT_DIFFUSE_COLOR, DISTANTDIFFUSE_PROP_COLOR);
      CONVERT_PROP(DISTANT_DIFFUSE_SURFACE_SCALE, DISTANTDIFFUSE_PROP_SURFACE_SCALE);
      CONVERT_PROP(DISTANT_DIFFUSE_KERNEL_UNIT_LENGTH, DISTANTDIFFUSE_PROP_KERNEL_UNIT_LENGTH);
    }
    break;
  case FilterType::POINT_SPECULAR:
    switch (aIndex) {
      CONVERT_PROP(POINT_SPECULAR_SPECULAR_CONSTANT, POINTSPECULAR_PROP_SPECULAR_CONSTANT);
      CONVERT_PROP(POINT_SPECULAR_SPECULAR_EXPONENT, POINTSPECULAR_PROP_SPECULAR_EXPONENT);
      CONVERT_PROP(POINT_SPECULAR_POSITION, POINTSPECULAR_PROP_LIGHT_POSITION);
      CONVERT_PROP(POINT_SPECULAR_COLOR, POINTSPECULAR_PROP_COLOR);
      CONVERT_PROP(POINT_SPECULAR_SURFACE_SCALE, POINTSPECULAR_PROP_SURFACE_SCALE);
      CONVERT_PROP(POINT_SPECULAR_KERNEL_UNIT_LENGTH, POINTSPECULAR_PROP_KERNEL_UNIT_LENGTH);
    }
    break;
  case FilterType::SPOT_SPECULAR:
    switch (aIndex) {
      CONVERT_PROP(SPOT_SPECULAR_SPECULAR_CONSTANT, SPOTSPECULAR_PROP_SPECULAR_CONSTANT);
      CONVERT_PROP(SPOT_SPECULAR_SPECULAR_EXPONENT, SPOTSPECULAR_PROP_SPECULAR_EXPONENT);
      CONVERT_PROP(SPOT_SPECULAR_POINTS_AT, SPOTSPECULAR_PROP_POINTS_AT);
      CONVERT_PROP(SPOT_SPECULAR_FOCUS, SPOTSPECULAR_PROP_FOCUS);
      CONVERT_PROP(SPOT_SPECULAR_LIMITING_CONE_ANGLE, SPOTSPECULAR_PROP_LIMITING_CONE_ANGLE);
      CONVERT_PROP(SPOT_SPECULAR_POSITION, SPOTSPECULAR_PROP_LIGHT_POSITION);
      CONVERT_PROP(SPOT_SPECULAR_COLOR, SPOTSPECULAR_PROP_COLOR);
      CONVERT_PROP(SPOT_SPECULAR_SURFACE_SCALE, SPOTSPECULAR_PROP_SURFACE_SCALE);
      CONVERT_PROP(SPOT_SPECULAR_KERNEL_UNIT_LENGTH, SPOTSPECULAR_PROP_KERNEL_UNIT_LENGTH);
    }
    break;
  case FilterType::DISTANT_SPECULAR:
    switch (aIndex) {
      CONVERT_PROP(DISTANT_SPECULAR_SPECULAR_CONSTANT, DISTANTSPECULAR_PROP_SPECULAR_CONSTANT);
      CONVERT_PROP(DISTANT_SPECULAR_SPECULAR_EXPONENT, DISTANTSPECULAR_PROP_SPECULAR_EXPONENT);
      CONVERT_PROP(DISTANT_SPECULAR_AZIMUTH, DISTANTSPECULAR_PROP_AZIMUTH);
      CONVERT_PROP(DISTANT_SPECULAR_ELEVATION, DISTANTSPECULAR_PROP_ELEVATION);
      CONVERT_PROP(DISTANT_SPECULAR_COLOR, DISTANTSPECULAR_PROP_COLOR);
      CONVERT_PROP(DISTANT_SPECULAR_SURFACE_SCALE, DISTANTSPECULAR_PROP_SURFACE_SCALE);
      CONVERT_PROP(DISTANT_SPECULAR_KERNEL_UNIT_LENGTH, DISTANTSPECULAR_PROP_KERNEL_UNIT_LENGTH);
    }
    break;
  case FilterType::CROP:
    switch (aIndex) {
      CONVERT_PROP(CROP_RECT, CROP_PROP_RECT);
    }
    break;
  }

  return UINT32_MAX;
}

bool
GetD2D1PropsForIntSize(FilterType aType, uint32_t aIndex, UINT32 *aPropWidth, UINT32 *aPropHeight)
{
  switch (aType) {
  case FilterType::MORPHOLOGY:
    if (aIndex == ATT_MORPHOLOGY_RADII) {
      *aPropWidth = D2D1_MORPHOLOGY_PROP_WIDTH;
      *aPropHeight = D2D1_MORPHOLOGY_PROP_HEIGHT;
      return true;
    }
    break;
  }
  return false;
}

static inline REFCLSID GetCLDIDForFilterType(FilterType aType)
{
  switch (aType) {
  case FilterType::COLOR_MATRIX:
    return CLSID_D2D1ColorMatrix;
  case FilterType::TRANSFORM:
    return CLSID_D2D12DAffineTransform;
  case FilterType::BLEND:
    return CLSID_D2D1Blend;
  case FilterType::MORPHOLOGY:
    return CLSID_D2D1Morphology;
  case FilterType::FLOOD:
    return CLSID_D2D1Flood;
  case FilterType::TILE:
    return CLSID_D2D1Tile;
  case FilterType::TABLE_TRANSFER:
    return CLSID_D2D1TableTransfer;
  case FilterType::LINEAR_TRANSFER:
    return CLSID_D2D1LinearTransfer;
  case FilterType::DISCRETE_TRANSFER:
    return CLSID_D2D1DiscreteTransfer;
  case FilterType::GAMMA_TRANSFER:
    return CLSID_D2D1GammaTransfer;
  case FilterType::DISPLACEMENT_MAP:
    return CLSID_D2D1DisplacementMap;
  case FilterType::TURBULENCE:
    return CLSID_D2D1Turbulence;
  case FilterType::ARITHMETIC_COMBINE:
    return CLSID_D2D1ArithmeticComposite;
  case FilterType::COMPOSITE:
    return CLSID_D2D1Composite;
  case FilterType::GAUSSIAN_BLUR:
    return CLSID_D2D1GaussianBlur;
  case FilterType::DIRECTIONAL_BLUR:
    return CLSID_D2D1DirectionalBlur;
  case FilterType::POINT_DIFFUSE:
    return CLSID_D2D1PointDiffuse;
  case FilterType::POINT_SPECULAR:
    return CLSID_D2D1PointSpecular;
  case FilterType::SPOT_DIFFUSE:
    return CLSID_D2D1SpotDiffuse;
  case FilterType::SPOT_SPECULAR:
    return CLSID_D2D1SpotSpecular;
  case FilterType::DISTANT_DIFFUSE:
    return CLSID_D2D1DistantDiffuse;
  case FilterType::DISTANT_SPECULAR:
    return CLSID_D2D1DistantSpecular;
  case FilterType::CROP:
    return CLSID_D2D1Crop;
  case FilterType::PREMULTIPLY:
    return CLSID_D2D1Premultiply;
  case FilterType::UNPREMULTIPLY:
    return CLSID_D2D1UnPremultiply;
  }
  return GUID_NULL;
}

/* static */
TemporaryRef<FilterNode>
FilterNodeD2D1::Create(ID2D1DeviceContext *aDC, FilterType aType)
{
  if (aType == FilterType::CONVOLVE_MATRIX) {
    return new FilterNodeConvolveD2D1(aDC);
  }

  RefPtr<ID2D1Effect> effect;
  HRESULT hr;

  hr = aDC->CreateEffect(GetCLDIDForFilterType(aType), byRef(effect));

  if (FAILED(hr)) {
    gfxWarning() << "Failed to create effect for FilterType: " << hexa(hr);
    return nullptr;
  }

  switch (aType) {
    case FilterType::LINEAR_TRANSFER:
    case FilterType::GAMMA_TRANSFER:
    case FilterType::TABLE_TRANSFER:
    case FilterType::DISCRETE_TRANSFER:
      return new FilterNodeComponentTransferD2D1(aDC, effect, aType);
    default:
      return new FilterNodeD2D1(effect, aType);
  }
}

void
FilterNodeD2D1::InitUnmappedProperties()
{
  switch (mType) {
    case FilterType::TRANSFORM:
      mEffect->SetValue(D2D1_2DAFFINETRANSFORM_PROP_BORDER_MODE, D2D1_BORDER_MODE_HARD);
      break;
    default:
      break;
  }
}

void
FilterNodeD2D1::SetInput(uint32_t aIndex, SourceSurface *aSurface)
{
  UINT32 input = GetD2D1InputForInput(mType, aIndex);
  ID2D1Effect* effect = InputEffect();
  MOZ_ASSERT(input < effect->GetInputCount());

  if (mType == FilterType::COMPOSITE) {
    UINT32 inputCount = effect->GetInputCount();

    if (aIndex == inputCount - 1 && aSurface == nullptr) {
      effect->SetInputCount(inputCount - 1);
    } else if (aIndex >= inputCount && aSurface) {
      effect->SetInputCount(aIndex + 1);
    }
  }

  MOZ_ASSERT(input < effect->GetInputCount());

  mInputSurfaces.resize(effect->GetInputCount());
  mInputFilters.resize(effect->GetInputCount());

  // In order to convert aSurface into an ID2D1Image, we need to know what
  // DrawTarget we paint into. However, the same FilterNode object can be
  // used on different DrawTargets, so we need to hold on to the SourceSurface
  // objects and delay the conversion until we're actually painted and know
  // our target DrawTarget.
  // The conversion happens in WillDraw().

  mInputSurfaces[input] = aSurface;
  mInputFilters[input] = nullptr;

  // Clear the existing image from the effect.
  effect->SetInput(input, nullptr);
}

void
FilterNodeD2D1::SetInput(uint32_t aIndex, FilterNode *aFilter)
{
  UINT32 input = GetD2D1InputForInput(mType, aIndex);
  ID2D1Effect* effect = InputEffect();

  if (mType == FilterType::COMPOSITE) {
    UINT32 inputCount = effect->GetInputCount();

    if (aIndex == inputCount - 1 && aFilter == nullptr) {
      effect->SetInputCount(inputCount - 1);
    } else if (aIndex >= inputCount && aFilter) {
      effect->SetInputCount(aIndex + 1);
    }
  }

  MOZ_ASSERT(input < effect->GetInputCount());

  if (aFilter && aFilter->GetBackendType() != FILTER_BACKEND_DIRECT2D1_1) {
    gfxWarning() << "Unknown input FilterNode set on effect.";
    MOZ_ASSERT(0);
    return;
  }

  FilterNodeD2D1* filter = static_cast<FilterNodeD2D1*>(aFilter);

  mInputSurfaces.resize(effect->GetInputCount());
  mInputFilters.resize(effect->GetInputCount());

  // We hold on to the FilterNode object so that we can call WillDraw() on it.
  mInputSurfaces[input] = nullptr;
  mInputFilters[input] = filter;

  if (filter) {
    effect->SetInputEffect(input, filter->OutputEffect());
  }
}

void
FilterNodeD2D1::WillDraw(DrawTarget *aDT)
{
  // Convert input SourceSurfaces into ID2D1Images and set them on the effect.
  for (size_t inputIndex = 0; inputIndex < mInputSurfaces.size(); inputIndex++) {
    if (mInputSurfaces[inputIndex]) {
      ID2D1Effect* effect = InputEffect();
      RefPtr<ID2D1Image> image = GetImageForSourceSurface(aDT, mInputSurfaces[inputIndex]);
      effect->SetInput(inputIndex, image);
    }
  }

  // Call WillDraw() on our input filters.
  for (std::vector<RefPtr<FilterNodeD2D1>>::iterator it = mInputFilters.begin();
       it != mInputFilters.end(); it++) {
    if (*it) {
      (*it)->WillDraw(aDT);
    }
  }
}

void
FilterNodeD2D1::SetAttribute(uint32_t aIndex, uint32_t aValue)
{
  UINT32 input = GetD2D1PropForAttribute(mType, aIndex);
  MOZ_ASSERT(input < mEffect->GetPropertyCount());

  if (mType == FilterType::TURBULENCE && aIndex == ATT_TURBULENCE_BASE_FREQUENCY) {
    mEffect->SetValue(input, D2D1::Vector2F(FLOAT(aValue), FLOAT(aValue)));
    return;
  } else if (mType == FilterType::DIRECTIONAL_BLUR && aIndex == ATT_DIRECTIONAL_BLUR_DIRECTION) {
    mEffect->SetValue(input, aValue == BLUR_DIRECTION_X ? 0 : 90.0f);
    return;
  }

  mEffect->SetValue(input, ConvertValue(mType, aIndex, aValue));
}

void
FilterNodeD2D1::SetAttribute(uint32_t aIndex, Float aValue)
{
  UINT32 input = GetD2D1PropForAttribute(mType, aIndex);
  MOZ_ASSERT(input < mEffect->GetPropertyCount());

  mEffect->SetValue(input, aValue);
}

void
FilterNodeD2D1::SetAttribute(uint32_t aIndex, const Point &aValue)
{
  UINT32 input = GetD2D1PropForAttribute(mType, aIndex);
  MOZ_ASSERT(input < mEffect->GetPropertyCount());

  mEffect->SetValue(input, D2DPoint(aValue));
}

void
FilterNodeD2D1::SetAttribute(uint32_t aIndex, const Matrix5x4 &aValue)
{
  UINT32 input = GetD2D1PropForAttribute(mType, aIndex);
  MOZ_ASSERT(input < mEffect->GetPropertyCount());

  mEffect->SetValue(input, D2DMatrix5x4(aValue));
}

void
FilterNodeD2D1::SetAttribute(uint32_t aIndex, const Point3D &aValue)
{
  UINT32 input = GetD2D1PropForAttribute(mType, aIndex);
  MOZ_ASSERT(input < mEffect->GetPropertyCount());

  mEffect->SetValue(input, D2DVector3D(aValue));
}

void
FilterNodeD2D1::SetAttribute(uint32_t aIndex, const Size &aValue)
{
  UINT32 input = GetD2D1PropForAttribute(mType, aIndex);
  MOZ_ASSERT(input < mEffect->GetPropertyCount());

  mEffect->SetValue(input, D2D1::Vector2F(aValue.width, aValue.height));
}

void
FilterNodeD2D1::SetAttribute(uint32_t aIndex, const IntSize &aValue)
{
  UINT32 widthProp, heightProp;

  if (!GetD2D1PropsForIntSize(mType, aIndex, &widthProp, &heightProp)) {
    return;
  }

  IntSize value = aValue;
  ConvertValue(mType, aIndex, value);

  mEffect->SetValue(widthProp, (UINT)value.width);
  mEffect->SetValue(heightProp, (UINT)value.height);
}

void
FilterNodeD2D1::SetAttribute(uint32_t aIndex, const Color &aValue)
{
  UINT32 input = GetD2D1PropForAttribute(mType, aIndex);
  MOZ_ASSERT(input < mEffect->GetPropertyCount());

  switch (mType) {
  case FilterType::POINT_DIFFUSE:
  case FilterType::SPOT_DIFFUSE:
  case FilterType::DISTANT_DIFFUSE:
  case FilterType::POINT_SPECULAR:
  case FilterType::SPOT_SPECULAR:
  case FilterType::DISTANT_SPECULAR:
    mEffect->SetValue(input, D2D1::Vector3F(aValue.r, aValue.g, aValue.b));
	break;
  default:
    mEffect->SetValue(input, D2D1::Vector4F(aValue.r * aValue.a, aValue.g * aValue.a, aValue.b * aValue.a, aValue.a));
  }
}

void
FilterNodeD2D1::SetAttribute(uint32_t aIndex, const Rect &aValue)
{
  UINT32 input = GetD2D1PropForAttribute(mType, aIndex);
  MOZ_ASSERT(input < mEffect->GetPropertyCount());

  mEffect->SetValue(input, D2DRect(aValue));
}

void
FilterNodeD2D1::SetAttribute(uint32_t aIndex, const IntRect &aValue)
{
  if (mType == FilterType::TURBULENCE) {
    MOZ_ASSERT(aIndex == ATT_TURBULENCE_RECT);

    mEffect->SetValue(D2D1_TURBULENCE_PROP_OFFSET, D2D1::Vector2F(Float(aValue.x), Float(aValue.y)));
    mEffect->SetValue(D2D1_TURBULENCE_PROP_SIZE, D2D1::Vector2F(Float(aValue.width), Float(aValue.height)));
    return;
  }

  UINT32 input = GetD2D1PropForAttribute(mType, aIndex);
  MOZ_ASSERT(input < mEffect->GetPropertyCount());

  mEffect->SetValue(input, D2D1::RectF(Float(aValue.x), Float(aValue.y),
                                       Float(aValue.XMost()), Float(aValue.YMost())));
}

void
FilterNodeD2D1::SetAttribute(uint32_t aIndex, bool aValue)
{
  UINT32 input = GetD2D1PropForAttribute(mType, aIndex);
  MOZ_ASSERT(input < mEffect->GetPropertyCount());

  mEffect->SetValue(input, (BOOL)aValue);
}

void
FilterNodeD2D1::SetAttribute(uint32_t aIndex, const Float *aValues, uint32_t aSize)
{
  UINT32 input = GetD2D1PropForAttribute(mType, aIndex);
  MOZ_ASSERT(input < mEffect->GetPropertyCount());

  mEffect->SetValue(input, (BYTE*)aValues, sizeof(Float) * aSize);
}

void
FilterNodeD2D1::SetAttribute(uint32_t aIndex, const IntPoint &aValue)
{
  UINT32 input = GetD2D1PropForAttribute(mType, aIndex);
  MOZ_ASSERT(input < mEffect->GetPropertyCount());

  mEffect->SetValue(input, D2DPoint(aValue));
}

void
FilterNodeD2D1::SetAttribute(uint32_t aIndex, const Matrix &aMatrix)
{
  UINT32 input = GetD2D1PropForAttribute(mType, aIndex);
  MOZ_ASSERT(input < mEffect->GetPropertyCount());

  mEffect->SetValue(input, D2DMatrix(aMatrix));
}

FilterNodeConvolveD2D1::FilterNodeConvolveD2D1(ID2D1DeviceContext *aDC)
  : FilterNodeD2D1(nullptr, FilterType::CONVOLVE_MATRIX)
  , mEdgeMode(EDGE_MODE_DUPLICATE)
{
  // Correctly handling the interaction of edge mode and source rect is a bit
  // tricky with D2D1 effects. We want the edge mode to only apply outside of
  // the source rect (as specified by the ATT_CONVOLVE_MATRIX_SOURCE_RECT
  // attribute). So if our input surface or filter is smaller than the source
  // rect, we need to add transparency around it until we reach the edges of
  // the source rect, and only then do any repeating or edge duplicating.
  // Unfortunately, D2D1 does not have any "extend with transparency" effect.
  // (The crop effect can only cut off parts, it can't make the output rect
  // bigger.) And the border effect does not have a source rect attribute -
  // it only looks at the output rect of its input filter or surface.
  // So we use the following trick to extend the input size to the source rect:
  // Instead of feeding the input directly into the border effect, we first
  // composite it with a transparent flood effect (which is infinite-sized) and
  // use a crop effect on the result in order to get the right size. Then we
  // feed the cropped composition into the border effect, which then finally
  // feeds into the convolve matrix effect.
  // All of this is only necessary when our edge mode is not EDGE_MODE_NONE, so
  // we update the filter chain dynamically in UpdateChain().

  HRESULT hr;
  
  hr = aDC->CreateEffect(CLSID_D2D1ConvolveMatrix, byRef(mEffect));

  if (FAILED(hr)) {
    gfxWarning() << "Failed to create ConvolveMatrix filter!";
    return;
  }

  mEffect->SetValue(D2D1_CONVOLVEMATRIX_PROP_BORDER_MODE, D2D1_BORDER_MODE_SOFT);

  hr = aDC->CreateEffect(CLSID_D2D1Flood, byRef(mFloodEffect));

  if (FAILED(hr)) {
    gfxWarning() << "Failed to create ConvolveMatrix filter!";
    return;
  }

  mFloodEffect->SetValue(D2D1_FLOOD_PROP_COLOR, D2D1::Vector4F(0.0f, 0.0f, 0.0f, 0.0f));

  hr = aDC->CreateEffect(CLSID_D2D1Composite, byRef(mCompositeEffect));

  if (FAILED(hr)) {
    gfxWarning() << "Failed to create ConvolveMatrix filter!";
    return;
  }

  mCompositeEffect->SetInputEffect(1, mFloodEffect.get());

  hr = aDC->CreateEffect(CLSID_D2D1Crop, byRef(mCropEffect));

  if (FAILED(hr)) {
    gfxWarning() << "Failed to create ConvolveMatrix filter!";
    return;
  }

  mCropEffect->SetInputEffect(0, mCompositeEffect.get());

  hr = aDC->CreateEffect(CLSID_D2D1Border, byRef(mBorderEffect));

  if (FAILED(hr)) {
    gfxWarning() << "Failed to create ConvolveMatrix filter!";
    return;
  }

  mBorderEffect->SetInputEffect(0, mCropEffect.get());

  UpdateChain();
  UpdateSourceRect();
}

void
FilterNodeConvolveD2D1::SetInput(uint32_t aIndex, FilterNode *aFilter)
{
  FilterNodeD2D1::SetInput(aIndex, aFilter);

  UpdateChain();
}

void
FilterNodeConvolveD2D1::SetAttribute(uint32_t aIndex, uint32_t aValue)
{
  if (aIndex != ATT_CONVOLVE_MATRIX_EDGE_MODE) {
    return FilterNodeD2D1::SetAttribute(aIndex, aValue);
  }

  mEdgeMode = (ConvolveMatrixEdgeMode)aValue;

  UpdateChain();
}

ID2D1Effect*
FilterNodeConvolveD2D1::InputEffect()
{
  return mEdgeMode == EDGE_MODE_NONE ? mEffect.get() : mCompositeEffect.get();
}

void
FilterNodeConvolveD2D1::UpdateChain()
{
  // The shape of the filter graph:
  //
  // EDGE_MODE_NONE:
  // input --> convolvematrix
  //
  // EDGE_MODE_DUPLICATE or EDGE_MODE_WRAP:
  // input -------v
  // flood --> composite --> crop --> border --> convolvematrix
  //
  // mEffect is convolvematrix.

  if (mEdgeMode != EDGE_MODE_NONE) {
    mEffect->SetInputEffect(0, mBorderEffect.get());
  }

  RefPtr<ID2D1Effect> inputEffect;
  if (mInputFilters.size() > 0 && mInputFilters[0]) {
    inputEffect = mInputFilters[0]->OutputEffect();
  }
  InputEffect()->SetInputEffect(0, inputEffect);

  if (mEdgeMode == EDGE_MODE_DUPLICATE) {
    mBorderEffect->SetValue(D2D1_BORDER_PROP_EDGE_MODE_X, D2D1_BORDER_EDGE_MODE_CLAMP);
    mBorderEffect->SetValue(D2D1_BORDER_PROP_EDGE_MODE_Y, D2D1_BORDER_EDGE_MODE_CLAMP);
  } else if (mEdgeMode == EDGE_MODE_WRAP) {
    mBorderEffect->SetValue(D2D1_BORDER_PROP_EDGE_MODE_X, D2D1_BORDER_EDGE_MODE_WRAP);
    mBorderEffect->SetValue(D2D1_BORDER_PROP_EDGE_MODE_Y, D2D1_BORDER_EDGE_MODE_WRAP);
  }
}

void
FilterNodeConvolveD2D1::SetAttribute(uint32_t aIndex, const IntSize &aValue)
{
  if (aIndex != ATT_CONVOLVE_MATRIX_KERNEL_SIZE) {
    MOZ_ASSERT(false);
    return;
  }

  mKernelSize = aValue;

  mEffect->SetValue(D2D1_CONVOLVEMATRIX_PROP_KERNEL_SIZE_X, aValue.width);
  mEffect->SetValue(D2D1_CONVOLVEMATRIX_PROP_KERNEL_SIZE_Y, aValue.height);

  UpdateOffset();
}

void
FilterNodeConvolveD2D1::SetAttribute(uint32_t aIndex, const IntPoint &aValue)
{
  if (aIndex != ATT_CONVOLVE_MATRIX_TARGET) {
    MOZ_ASSERT(false);
    return;
  }

  mTarget = aValue;

  UpdateOffset();
}

void
FilterNodeConvolveD2D1::SetAttribute(uint32_t aIndex, const IntRect &aValue)
{
  if (aIndex != ATT_CONVOLVE_MATRIX_SOURCE_RECT) {
    MOZ_ASSERT(false);
    return;
  }

  mSourceRect = aValue;

  UpdateSourceRect();
}

void
FilterNodeConvolveD2D1::UpdateOffset()
{
  D2D1_VECTOR_2F vector =
    D2D1::Vector2F((Float(mKernelSize.width) - 1.0f) / 2.0f - Float(mTarget.x),
                   (Float(mKernelSize.height) - 1.0f) / 2.0f - Float(mTarget.y));

  mEffect->SetValue(D2D1_CONVOLVEMATRIX_PROP_KERNEL_OFFSET, vector);
}

void
FilterNodeConvolveD2D1::UpdateSourceRect()
{
  mCropEffect->SetValue(D2D1_CROP_PROP_RECT,
    D2D1::RectF(Float(mSourceRect.x), Float(mSourceRect.y),
                Float(mSourceRect.XMost()), Float(mSourceRect.YMost())));
}

FilterNodeComponentTransferD2D1::FilterNodeComponentTransferD2D1(ID2D1DeviceContext *aDC,
                                                                 ID2D1Effect *aEffect, FilterType aType)
 : FilterNodeD2D1(aEffect, aType)
{
  // D2D1 component transfer effects do strange things when it comes to
  // premultiplication.
  // For our purposes we only need the transfer filters to apply straight to
  // unpremultiplied source channels and output unpremultiplied results.
  // However, the D2D1 effects are designed differently: They can apply to both
  // premultiplied and unpremultiplied inputs, and they always premultiply
  // their result - at least in those color channels that have not been
  // disabled.
  // In order to determine whether the input needs to be unpremultiplied as
  // part of the transfer, the effect consults the alpha mode metadata of the
  // input surface or the input effect. We don't have such a concept in Moz2D,
  // and giving Moz2D users different results based on something that cannot be
  // influenced through Moz2D APIs seems like a bad idea.
  // We solve this by applying a premultiply effect to the input before feeding
  // it into the transfer effect. The premultiply effect always premultiplies
  // regardless of any alpha mode metadata on inputs, and it always marks its
  // output as premultiplied so that the transfer effect will unpremultiply
  // consistently. Feeding always-premultiplied input into the transfer effect
  // also avoids another problem that would appear when individual color
  // channels disable the transfer: In that case, the disabled channels would
  // pass through unchanged in their unpremultiplied form and the other
  // channels would be premultiplied, giving a mixed result.
  // But since we now ensure that the input is premultiplied, disabled channels
  // will pass premultiplied values through to the result, which is consistent
  // with the enabled channels.
  // We also add an unpremultiply effect that postprocesses the result of the
  // transfer effect because getting unpremultiplied results from the transfer
  // filters is part of the FilterNode API.
  HRESULT hr;

  hr = aDC->CreateEffect(CLSID_D2D1Premultiply, byRef(mPrePremultiplyEffect));

  if (FAILED(hr)) {
    gfxWarning() << "Failed to create ComponentTransfer filter!";
    return;
  }

  hr = aDC->CreateEffect(CLSID_D2D1UnPremultiply, byRef(mPostUnpremultiplyEffect));

  if (FAILED(hr)) {
    gfxWarning() << "Failed to create ComponentTransfer filter!";
    return;
  }

  mEffect->SetInputEffect(0, mPrePremultiplyEffect.get());
  mPostUnpremultiplyEffect->SetInputEffect(0, mEffect.get());
}

}
}