gecko-dev/gfx/layers/Effects.h

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/* -*- 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_LAYERS_EFFECTS_H
#define MOZILLA_LAYERS_EFFECTS_H
#include "mozilla/Assertions.h" // for MOZ_ASSERT, etc
#include "mozilla/RefPtr.h" // for RefPtr, already_AddRefed, etc
#include "mozilla/gfx/Matrix.h" // for Matrix4x4
#include "mozilla/gfx/Point.h" // for IntSize
#include "mozilla/gfx/Rect.h" // for Rect
#include "mozilla/gfx/Types.h" // for SamplingFilter, etc
#include "mozilla/layers/CompositorTypes.h" // for EffectTypes, etc
#include "mozilla/layers/LayersTypes.h"
#include "mozilla/layers/TextureHost.h" // for CompositingRenderTarget, etc
#include "mozilla/mozalloc.h" // for operator delete, etc
#include "nscore.h" // for nsACString
#include "mozilla/EnumeratedArray.h"
namespace mozilla {
namespace layers {
/**
* Effects and effect chains are used by the compositor API (see Compositor.h).
* An effect chain represents a rendering method, for example some shader and
* the data required for that shader to run. An effect is some component of the
* chain and its data.
*
* An effect chain consists of a primary effect - how the 'texture' memory should
* be interpreted (RGBA, BGRX, YCBCR, etc.) - and any number of secondary effects
* - any way in which rendering can be changed, e.g., applying a mask layer.
*
* During the rendering process, an effect chain is created by the layer being
* rendered and the primary effect is added by the compositable host. Secondary
* effects may be added by the layer or compositable. The effect chain is passed
* to the compositor by the compositable host as a parameter to DrawQuad.
*/
struct TexturedEffect;
struct Effect
{
NS_INLINE_DECL_REFCOUNTING(Effect)
explicit Effect(EffectTypes aType) : mType(aType) {}
EffectTypes mType;
virtual TexturedEffect* AsTexturedEffect() { return nullptr; }
virtual void PrintInfo(std::stringstream& aStream, const char* aPrefix) = 0;
protected:
virtual ~Effect() {}
};
// Render from a texture
struct TexturedEffect : public Effect
{
TexturedEffect(EffectTypes aType,
TextureSource *aTexture,
bool aPremultiplied,
gfx::SamplingFilter aSamplingFilter)
: Effect(aType)
, mTextureCoords(0, 0, 1.0f, 1.0f)
, mTexture(aTexture)
, mPremultiplied(aPremultiplied)
, mSamplingFilter(aSamplingFilter)
{}
virtual TexturedEffect* AsTexturedEffect() override { return this; }
virtual const char* Name() = 0;
virtual void PrintInfo(std::stringstream& aStream, const char* aPrefix) override;
gfx::Rect mTextureCoords;
TextureSource* mTexture;
bool mPremultiplied;
gfx::SamplingFilter mSamplingFilter;
};
// Support an alpha mask.
struct EffectMask : public Effect
{
EffectMask(TextureSource *aMaskTexture,
gfx::IntSize aSize,
const gfx::Matrix4x4 &aMaskTransform)
: Effect(EffectTypes::MASK)
, mMaskTexture(aMaskTexture)
, mSize(aSize)
, mMaskTransform(aMaskTransform)
{}
virtual void PrintInfo(std::stringstream& aStream, const char* aPrefix) override;
TextureSource* mMaskTexture;
gfx::IntSize mSize;
gfx::Matrix4x4 mMaskTransform;
};
struct EffectBlendMode : public Effect
{
explicit EffectBlendMode(gfx::CompositionOp aBlendMode)
: Effect(EffectTypes::BLEND_MODE)
, mBlendMode(aBlendMode)
{ }
virtual const char* Name() { return "EffectBlendMode"; }
virtual void PrintInfo(std::stringstream& aStream, const char* aPrefix) override;
gfx::CompositionOp mBlendMode;
};
// Render to a render target rather than the screen.
struct EffectRenderTarget : public TexturedEffect
{
explicit EffectRenderTarget(CompositingRenderTarget *aRenderTarget)
: TexturedEffect(EffectTypes::RENDER_TARGET, aRenderTarget, true,
gfx::SamplingFilter::LINEAR)
, mRenderTarget(aRenderTarget)
{}
virtual const char* Name() override { return "EffectRenderTarget"; }
virtual void PrintInfo(std::stringstream& aStream, const char* aPrefix) override;
RefPtr<CompositingRenderTarget> mRenderTarget;
protected:
EffectRenderTarget(EffectTypes aType, CompositingRenderTarget *aRenderTarget)
: TexturedEffect(aType, aRenderTarget, true, gfx::SamplingFilter::LINEAR)
, mRenderTarget(aRenderTarget)
{}
};
// Render to a render target rather than the screen.
struct EffectColorMatrix : public Effect
{
explicit EffectColorMatrix(gfx::Matrix5x4 aMatrix)
: Effect(EffectTypes::COLOR_MATRIX)
, mColorMatrix(aMatrix)
{}
virtual const char* Name() { return "EffectColorMatrix"; }
virtual void PrintInfo(std::stringstream& aStream, const char* aPrefix) override;
const gfx::Matrix5x4 mColorMatrix;
};
struct EffectRGB : public TexturedEffect
{
EffectRGB(TextureSource *aTexture,
bool aPremultiplied,
gfx::SamplingFilter aSamplingFilter,
bool aFlipped = false)
: TexturedEffect(EffectTypes::RGB, aTexture, aPremultiplied, aSamplingFilter)
{}
virtual const char* Name() override { return "EffectRGB"; }
};
struct EffectYCbCr : public TexturedEffect
{
EffectYCbCr(TextureSource *aSource, YUVColorSpace aYUVColorSpace, uint32_t aBitDepth, gfx::SamplingFilter aSamplingFilter)
: TexturedEffect(EffectTypes::YCBCR, aSource, false, aSamplingFilter)
, mYUVColorSpace(aYUVColorSpace)
, mBitDepth(aBitDepth)
{}
virtual const char* Name() override { return "EffectYCbCr"; }
YUVColorSpace mYUVColorSpace;
uint32_t mBitDepth;
};
struct EffectNV12 : public TexturedEffect
{
EffectNV12(TextureSource *aSource, gfx::SamplingFilter aSamplingFilter)
: TexturedEffect(EffectTypes::NV12, aSource, false, aSamplingFilter)
{}
virtual const char* Name() override { return "EffectNV12"; }
};
struct EffectComponentAlpha : public TexturedEffect
{
EffectComponentAlpha(TextureSource *aOnBlack,
TextureSource *aOnWhite,
gfx::SamplingFilter aSamplingFilter)
: TexturedEffect(EffectTypes::COMPONENT_ALPHA, nullptr, false, aSamplingFilter)
, mOnBlack(aOnBlack)
, mOnWhite(aOnWhite)
{}
virtual const char* Name() override { return "EffectComponentAlpha"; }
TextureSource* mOnBlack;
TextureSource* mOnWhite;
};
struct EffectSolidColor : public Effect
{
explicit EffectSolidColor(const gfx::Color &aColor)
: Effect(EffectTypes::SOLID_COLOR)
, mColor(aColor)
{}
virtual void PrintInfo(std::stringstream& aStream, const char* aPrefix) override;
gfx::Color mColor;
};
struct EffectChain
{
EffectChain() : mLayerRef(nullptr) {}
explicit EffectChain(void* aLayerRef) : mLayerRef(aLayerRef) {}
RefPtr<Effect> mPrimaryEffect;
EnumeratedArray<EffectTypes, EffectTypes::MAX_SECONDARY, RefPtr<Effect>>
mSecondaryEffects;
void* mLayerRef; //!< For LayerScope logging
};
/**
* Create a Textured effect corresponding to aFormat and using
* aSource as the (first) texture source.
*
* Note that aFormat can be different form aSource->GetFormat if, we are
* creating an effect that takes several texture sources (like with YCBCR
* where aFormat would be FOMRAT_YCBCR and each texture source would be
* a one-channel A8 texture)
*/
inline already_AddRefed<TexturedEffect>
CreateTexturedEffect(gfx::SurfaceFormat aFormat,
TextureSource* aSource,
const gfx::SamplingFilter aSamplingFilter,
bool isAlphaPremultiplied)
{
MOZ_ASSERT(aSource);
RefPtr<TexturedEffect> result;
switch (aFormat) {
case gfx::SurfaceFormat::B8G8R8A8:
case gfx::SurfaceFormat::B8G8R8X8:
case gfx::SurfaceFormat::R8G8B8X8:
case gfx::SurfaceFormat::R5G6B5_UINT16:
case gfx::SurfaceFormat::R8G8B8A8:
result = new EffectRGB(aSource, isAlphaPremultiplied, aSamplingFilter);
break;
case gfx::SurfaceFormat::NV12:
result = new EffectNV12(aSource, aSamplingFilter);
break;
case gfx::SurfaceFormat::YUV:
MOZ_ASSERT_UNREACHABLE("gfx::SurfaceFormat::YUV is invalid");
break;
default:
NS_WARNING("unhandled program type");
break;
}
return result.forget();
}
inline already_AddRefed<TexturedEffect>
CreateTexturedEffect(TextureHost* aHost,
TextureSource* aSource,
const gfx::SamplingFilter aSamplingFilter,
bool isAlphaPremultiplied)
{
MOZ_ASSERT(aHost);
MOZ_ASSERT(aSource);
RefPtr<TexturedEffect> result;
if (aHost->GetReadFormat() == gfx::SurfaceFormat::YUV) {
MOZ_ASSERT(aHost->GetYUVColorSpace() != YUVColorSpace::UNKNOWN);
result = new EffectYCbCr(
aSource, aHost->GetYUVColorSpace(), aHost->GetBitDepth(), aSamplingFilter);
} else {
result = CreateTexturedEffect(aHost->GetReadFormat(),
aSource,
aSamplingFilter,
isAlphaPremultiplied);
}
return result.forget();
}
/**
* Create a textured effect based on aSource format and the presence of
* aSourceOnWhite.
*
* aSourceOnWhite can be null.
*/
inline already_AddRefed<TexturedEffect>
CreateTexturedEffect(TextureSource* aSource,
TextureSource* aSourceOnWhite,
const gfx::SamplingFilter aSamplingFilter,
bool isAlphaPremultiplied)
{
MOZ_ASSERT(aSource);
if (aSourceOnWhite) {
MOZ_ASSERT(aSource->GetFormat() == gfx::SurfaceFormat::R8G8B8X8 ||
aSource->GetFormat() == gfx::SurfaceFormat::B8G8R8X8);
MOZ_ASSERT(aSource->GetFormat() == aSourceOnWhite->GetFormat());
return MakeAndAddRef<EffectComponentAlpha>(aSource, aSourceOnWhite,
aSamplingFilter);
}
return CreateTexturedEffect(aSource->GetFormat(),
aSource,
aSamplingFilter,
isAlphaPremultiplied);
}
/**
* Create a textured effect based on aSource format.
*
* This version excudes the possibility of component alpha.
*/
inline already_AddRefed<TexturedEffect>
CreateTexturedEffect(TextureSource *aTexture,
const gfx::SamplingFilter aSamplingFilter)
{
return CreateTexturedEffect(aTexture, nullptr, aSamplingFilter, true);
}
} // namespace layers
} // namespace mozilla
#endif