gecko/gfx/layers/basic/BasicCanvasLayer.cpp

599 lines
17 KiB
C++

/* -*- Mode: C++; tab-width: 2; 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 "mozilla/layers/PLayersParent.h"
#include "gfxImageSurface.h"
#include "GLContext.h"
#include "gfxUtils.h"
#include "gfxPlatform.h"
#include "mozilla/Preferences.h"
#include "BasicLayersImpl.h"
#include "nsXULAppAPI.h"
using namespace mozilla::gfx;
namespace mozilla {
namespace layers {
class BasicCanvasLayer : public CanvasLayer,
public BasicImplData
{
public:
BasicCanvasLayer(BasicLayerManager* aLayerManager) :
CanvasLayer(aLayerManager, static_cast<BasicImplData*>(this))
{
MOZ_COUNT_CTOR(BasicCanvasLayer);
mForceReadback = Preferences::GetBool("webgl.force-layers-readback", false);
}
virtual ~BasicCanvasLayer()
{
MOZ_COUNT_DTOR(BasicCanvasLayer);
}
virtual void SetVisibleRegion(const nsIntRegion& aRegion)
{
NS_ASSERTION(BasicManager()->InConstruction(),
"Can only set properties in construction phase");
CanvasLayer::SetVisibleRegion(aRegion);
}
virtual void Initialize(const Data& aData);
virtual void Paint(gfxContext* aContext, Layer* aMaskLayer);
virtual void PaintWithOpacity(gfxContext* aContext,
float aOpacity,
Layer* aMaskLayer);
protected:
BasicLayerManager* BasicManager()
{
return static_cast<BasicLayerManager*>(mManager);
}
void UpdateSurface(gfxASurface* aDestSurface = nullptr, Layer* aMaskLayer = nullptr);
nsRefPtr<gfxASurface> mSurface;
nsRefPtr<mozilla::gl::GLContext> mGLContext;
mozilla::RefPtr<mozilla::gfx::DrawTarget> mDrawTarget;
uint32_t mCanvasFramebuffer;
bool mGLBufferIsPremultiplied;
bool mNeedsYFlip;
bool mForceReadback;
nsRefPtr<gfxImageSurface> mCachedTempSurface;
gfxIntSize mCachedSize;
gfxImageFormat mCachedFormat;
gfxImageSurface* GetTempSurface(const gfxIntSize& aSize, const gfxImageFormat aFormat)
{
if (!mCachedTempSurface ||
aSize.width != mCachedSize.width ||
aSize.height != mCachedSize.height ||
aFormat != mCachedFormat)
{
mCachedTempSurface = new gfxImageSurface(aSize, aFormat);
mCachedSize = aSize;
mCachedFormat = aFormat;
}
MOZ_ASSERT(mCachedTempSurface->Stride() == mCachedTempSurface->Width() * 4);
return mCachedTempSurface;
}
void DiscardTempSurface()
{
mCachedTempSurface = nullptr;
}
};
void
BasicCanvasLayer::Initialize(const Data& aData)
{
NS_ASSERTION(mSurface == nullptr, "BasicCanvasLayer::Initialize called twice!");
if (aData.mSurface) {
mSurface = aData.mSurface;
NS_ASSERTION(aData.mGLContext == nullptr,
"CanvasLayer can't have both surface and GLContext");
mNeedsYFlip = false;
} else if (aData.mGLContext) {
NS_ASSERTION(aData.mGLContext->IsOffscreen(), "canvas gl context isn't offscreen");
mGLContext = aData.mGLContext;
mGLBufferIsPremultiplied = aData.mGLBufferIsPremultiplied;
mCanvasFramebuffer = mGLContext->GetOffscreenFBO();
mNeedsYFlip = true;
} else if (aData.mDrawTarget) {
mDrawTarget = aData.mDrawTarget;
mSurface = gfxPlatform::GetPlatform()->GetThebesSurfaceForDrawTarget(mDrawTarget);
mNeedsYFlip = false;
} else {
NS_ERROR("CanvasLayer created without mSurface, mDrawTarget or mGLContext?");
}
mBounds.SetRect(0, 0, aData.mSize.width, aData.mSize.height);
}
void
BasicCanvasLayer::UpdateSurface(gfxASurface* aDestSurface, Layer* aMaskLayer)
{
if (!IsDirty())
return;
Painted();
if (mDrawTarget) {
mDrawTarget->Flush();
// TODO Fix me before turning accelerated quartz canvas by default
//mSurface = gfxPlatform::GetPlatform()->GetThebesSurfaceForDrawTarget(mDrawTarget);
}
if (!mGLContext && aDestSurface) {
nsRefPtr<gfxContext> tmpCtx = new gfxContext(aDestSurface);
tmpCtx->SetOperator(gfxContext::OPERATOR_SOURCE);
BasicCanvasLayer::PaintWithOpacity(tmpCtx, 1.0f, aMaskLayer);
return;
}
if (mGLContext) {
if (aDestSurface && aDestSurface->GetType() != gfxASurface::SurfaceTypeImage) {
NS_ASSERTION(aDestSurface->GetType() == gfxASurface::SurfaceTypeImage,
"Destination surface must be ImageSurface type");
return;
}
// We need to read from the GLContext
mGLContext->MakeCurrent();
#if defined (MOZ_X11) && defined (MOZ_EGL_XRENDER_COMPOSITE)
if (!mForceReadback) {
mGLContext->GuaranteeResolve();
gfxASurface* offscreenSurface = mGLContext->GetOffscreenPixmapSurface();
// XRender can only blend premuliplied alpha, so only allow xrender
// path if we have premultiplied alpha or opaque content.
if (offscreenSurface && (mGLBufferIsPremultiplied || (GetContentFlags() & CONTENT_OPAQUE))) {
mSurface = offscreenSurface;
mNeedsYFlip = false;
return;
}
}
#endif
gfxIntSize readSize(mBounds.width, mBounds.height);
gfxImageFormat format = (GetContentFlags() & CONTENT_OPAQUE)
? gfxASurface::ImageFormatRGB24
: gfxASurface::ImageFormatARGB32;
nsRefPtr<gfxImageSurface> readSurf;
nsRefPtr<gfxImageSurface> resultSurf;
bool usingTempSurface = false;
if (aDestSurface) {
resultSurf = static_cast<gfxImageSurface*>(aDestSurface);
if (resultSurf->GetSize() != readSize ||
resultSurf->Stride() != resultSurf->Width() * 4)
{
readSurf = GetTempSurface(readSize, format);
usingTempSurface = true;
}
} else {
resultSurf = GetTempSurface(readSize, format);
usingTempSurface = true;
}
if (!usingTempSurface)
DiscardTempSurface();
if (!readSurf)
readSurf = resultSurf;
if (!resultSurf || resultSurf->CairoStatus() != 0)
return;
MOZ_ASSERT(readSurf);
MOZ_ASSERT(readSurf->Stride() == mBounds.width * 4, "gfxImageSurface stride isn't what we expect!");
// We need to Flush() the surface before modifying it outside of cairo.
readSurf->Flush();
mGLContext->ReadScreenIntoImageSurface(readSurf);
readSurf->MarkDirty();
// If the underlying GLContext doesn't have a framebuffer into which
// premultiplied values were written, we have to do this ourselves here.
// Note that this is a WebGL attribute; GL itself has no knowledge of
// premultiplied or unpremultiplied alpha.
if (!mGLBufferIsPremultiplied)
gfxUtils::PremultiplyImageSurface(readSurf);
if (readSurf != resultSurf) {
MOZ_ASSERT(resultSurf->Width() >= readSurf->Width());
MOZ_ASSERT(resultSurf->Height() >= readSurf->Height());
resultSurf->Flush();
resultSurf->CopyFrom(readSurf);
resultSurf->MarkDirty();
}
// stick our surface into mSurface, so that the Paint() path is the same
if (!aDestSurface) {
mSurface = resultSurf;
}
}
}
void
BasicCanvasLayer::Paint(gfxContext* aContext, Layer* aMaskLayer)
{
if (IsHidden())
return;
UpdateSurface();
FireDidTransactionCallback();
PaintWithOpacity(aContext, GetEffectiveOpacity(), aMaskLayer);
}
void
BasicCanvasLayer::PaintWithOpacity(gfxContext* aContext,
float aOpacity,
Layer* aMaskLayer)
{
NS_ASSERTION(BasicManager()->InDrawing(),
"Can only draw in drawing phase");
if (!mSurface) {
NS_WARNING("No valid surface to draw!");
return;
}
nsRefPtr<gfxPattern> pat = new gfxPattern(mSurface);
pat->SetFilter(mFilter);
pat->SetExtend(gfxPattern::EXTEND_PAD);
gfxMatrix m;
if (mNeedsYFlip) {
m = aContext->CurrentMatrix();
aContext->Translate(gfxPoint(0.0, mBounds.height));
aContext->Scale(1.0, -1.0);
}
// If content opaque, then save off current operator and set to source.
// This ensures that alpha is not applied even if the source surface
// has an alpha channel
gfxContext::GraphicsOperator savedOp;
if (GetContentFlags() & CONTENT_OPAQUE) {
savedOp = aContext->CurrentOperator();
aContext->SetOperator(gfxContext::OPERATOR_SOURCE);
}
AutoSetOperator setOperator(aContext, GetOperator());
aContext->NewPath();
// No need to snap here; our transform is already set up to snap our rect
aContext->Rectangle(gfxRect(0, 0, mBounds.width, mBounds.height));
aContext->SetPattern(pat);
FillWithMask(aContext, aOpacity, aMaskLayer);
#if defined (MOZ_X11) && defined (MOZ_EGL_XRENDER_COMPOSITE)
if (mGLContext && !mForceReadback) {
// Wait for X to complete all operations before continuing
// Otherwise gl context could get cleared before X is done.
mGLContext->WaitNative();
}
#endif
// Restore surface operator
if (GetContentFlags() & CONTENT_OPAQUE) {
aContext->SetOperator(savedOp);
}
if (mNeedsYFlip) {
aContext->SetMatrix(m);
}
}
class BasicShadowableCanvasLayer : public BasicCanvasLayer,
public BasicShadowableLayer
{
public:
BasicShadowableCanvasLayer(BasicShadowLayerManager* aManager) :
BasicCanvasLayer(aManager),
mBufferIsOpaque(false)
{
MOZ_COUNT_CTOR(BasicShadowableCanvasLayer);
}
virtual ~BasicShadowableCanvasLayer()
{
DestroyBackBuffer();
MOZ_COUNT_DTOR(BasicShadowableCanvasLayer);
}
virtual void Initialize(const Data& aData);
virtual void Paint(gfxContext* aContext, Layer* aMaskLayer);
virtual void FillSpecificAttributes(SpecificLayerAttributes& aAttrs)
{
aAttrs = CanvasLayerAttributes(mFilter);
}
virtual Layer* AsLayer() { return this; }
virtual ShadowableLayer* AsShadowableLayer() { return this; }
virtual void SetBackBuffer(const SurfaceDescriptor& aBuffer)
{
mBackBuffer = aBuffer;
}
virtual void Disconnect()
{
mBackBuffer = SurfaceDescriptor();
BasicShadowableLayer::Disconnect();
}
void DestroyBackBuffer()
{
if (mBackBuffer.type() == SurfaceDescriptor::TSharedTextureDescriptor) {
SharedTextureDescriptor handle = mBackBuffer.get_SharedTextureDescriptor();
if (mGLContext && handle.handle()) {
mGLContext->ReleaseSharedHandle(handle.shareType(), handle.handle());
mBackBuffer = SurfaceDescriptor();
}
} else if (IsSurfaceDescriptorValid(mBackBuffer)) {
BasicManager()->ShadowLayerForwarder::DestroySharedSurface(&mBackBuffer);
mBackBuffer = SurfaceDescriptor();
}
}
private:
typedef mozilla::gl::SharedTextureHandle SharedTextureHandle;
typedef mozilla::gl::TextureImage TextureImage;
SharedTextureHandle GetSharedBackBufferHandle()
{
if (mBackBuffer.type() == SurfaceDescriptor::TSharedTextureDescriptor)
return mBackBuffer.get_SharedTextureDescriptor().handle();
return 0;
}
BasicShadowLayerManager* BasicManager()
{
return static_cast<BasicShadowLayerManager*>(mManager);
}
SurfaceDescriptor mBackBuffer;
bool mBufferIsOpaque;
};
void
BasicShadowableCanvasLayer::Initialize(const Data& aData)
{
BasicCanvasLayer::Initialize(aData);
if (!HasShadow())
return;
// XXX won't get here currently; need to figure out what to do on
// canvas resizes
if (IsSurfaceDescriptorValid(mBackBuffer)) {
AutoOpenSurface backSurface(OPEN_READ_ONLY, mBackBuffer);
if (gfxIntSize(mBounds.width, mBounds.height) != backSurface.Size()) {
DestroyBackBuffer();
}
}
}
void
BasicShadowableCanvasLayer::Paint(gfxContext* aContext, Layer* aMaskLayer)
{
if (!HasShadow()) {
BasicCanvasLayer::Paint(aContext, aMaskLayer);
return;
}
if (!IsDirty())
return;
if (mGLContext &&
!mForceReadback &&
BasicManager()->GetParentBackendType() == mozilla::layers::LAYERS_OPENGL) {
TextureImage::TextureShareType flags;
// if process type is default, then it is single-process (non-e10s)
if (XRE_GetProcessType() == GeckoProcessType_Default)
flags = TextureImage::ThreadShared;
else
flags = TextureImage::ProcessShared;
SharedTextureHandle handle = GetSharedBackBufferHandle();
if (!handle) {
handle = mGLContext->CreateSharedHandle(flags);
if (handle) {
mBackBuffer = SharedTextureDescriptor(flags, handle, mBounds.Size(), false);
}
}
if (handle) {
mGLContext->MakeCurrent();
mGLContext->UpdateSharedHandle(flags, handle);
FireDidTransactionCallback();
BasicManager()->PaintedCanvas(BasicManager()->Hold(this),
mNeedsYFlip,
mBackBuffer);
// Move SharedTextureHandle ownership to ShadowLayer
mBackBuffer = SurfaceDescriptor();
return;
}
}
bool isOpaque = (GetContentFlags() & CONTENT_OPAQUE);
if (!IsSurfaceDescriptorValid(mBackBuffer) ||
isOpaque != mBufferIsOpaque) {
DestroyBackBuffer();
mBufferIsOpaque = isOpaque;
gfxIntSize size(mBounds.width, mBounds.height);
gfxASurface::gfxContentType type = isOpaque ?
gfxASurface::CONTENT_COLOR : gfxASurface::CONTENT_COLOR_ALPHA;
if (!BasicManager()->AllocBuffer(size, type, &mBackBuffer)) {
NS_RUNTIMEABORT("creating CanvasLayer back buffer failed!");
}
}
AutoOpenSurface autoBackSurface(OPEN_READ_WRITE, mBackBuffer);
if (aMaskLayer) {
static_cast<BasicImplData*>(aMaskLayer->ImplData())
->Paint(aContext, nullptr);
}
UpdateSurface(autoBackSurface.Get(), nullptr);
FireDidTransactionCallback();
BasicManager()->PaintedCanvas(BasicManager()->Hold(this),
mNeedsYFlip, mBackBuffer);
}
class BasicShadowCanvasLayer : public ShadowCanvasLayer,
public BasicImplData
{
public:
BasicShadowCanvasLayer(BasicShadowLayerManager* aLayerManager) :
ShadowCanvasLayer(aLayerManager, static_cast<BasicImplData*>(this))
{
MOZ_COUNT_CTOR(BasicShadowCanvasLayer);
}
virtual ~BasicShadowCanvasLayer()
{
MOZ_COUNT_DTOR(BasicShadowCanvasLayer);
}
virtual void Disconnect()
{
DestroyFrontBuffer();
ShadowCanvasLayer::Disconnect();
}
virtual void Initialize(const Data& aData);
void Swap(const CanvasSurface& aNewFront, bool needYFlip, CanvasSurface* aNewBack);
virtual void DestroyFrontBuffer()
{
if (IsSurfaceDescriptorValid(mFrontSurface)) {
mAllocator->DestroySharedSurface(&mFrontSurface);
}
}
virtual void Paint(gfxContext* aContext, Layer* aMaskLayer);
private:
BasicShadowLayerManager* BasicManager()
{
return static_cast<BasicShadowLayerManager*>(mManager);
}
SurfaceDescriptor mFrontSurface;
bool mNeedsYFlip;
};
void
BasicShadowCanvasLayer::Initialize(const Data& aData)
{
NS_RUNTIMEABORT("Incompatibe surface type");
}
void
BasicShadowCanvasLayer::Swap(const CanvasSurface& aNewFront, bool needYFlip,
CanvasSurface* aNewBack)
{
AutoOpenSurface autoSurface(OPEN_READ_ONLY, aNewFront);
// Destroy mFrontBuffer if size different
gfxIntSize sz = autoSurface.Size();
bool surfaceConfigChanged = sz != gfxIntSize(mBounds.width, mBounds.height);
if (IsSurfaceDescriptorValid(mFrontSurface)) {
AutoOpenSurface autoFront(OPEN_READ_ONLY, mFrontSurface);
surfaceConfigChanged = surfaceConfigChanged ||
autoSurface.ContentType() != autoFront.ContentType();
}
if (surfaceConfigChanged) {
DestroyFrontBuffer();
mBounds.SetRect(0, 0, sz.width, sz.height);
}
mNeedsYFlip = needYFlip;
// If mFrontBuffer
if (IsSurfaceDescriptorValid(mFrontSurface)) {
*aNewBack = mFrontSurface;
} else {
*aNewBack = null_t();
}
mFrontSurface = aNewFront;
}
void
BasicShadowCanvasLayer::Paint(gfxContext* aContext, Layer* aMaskLayer)
{
NS_ASSERTION(BasicManager()->InDrawing(),
"Can only draw in drawing phase");
if (!IsSurfaceDescriptorValid(mFrontSurface)) {
return;
}
AutoOpenSurface autoSurface(OPEN_READ_ONLY, mFrontSurface);
nsRefPtr<gfxPattern> pat = new gfxPattern(autoSurface.Get());
pat->SetFilter(mFilter);
pat->SetExtend(gfxPattern::EXTEND_PAD);
gfxRect r(0, 0, mBounds.width, mBounds.height);
gfxMatrix m;
if (mNeedsYFlip) {
m = aContext->CurrentMatrix();
aContext->Translate(gfxPoint(0.0, mBounds.height));
aContext->Scale(1.0, -1.0);
}
AutoSetOperator setOperator(aContext, GetOperator());
aContext->NewPath();
// No need to snap here; our transform has already taken care of it
aContext->Rectangle(r);
aContext->SetPattern(pat);
FillWithMask(aContext, GetEffectiveOpacity(), aMaskLayer);
if (mNeedsYFlip) {
aContext->SetMatrix(m);
}
}
already_AddRefed<CanvasLayer>
BasicLayerManager::CreateCanvasLayer()
{
NS_ASSERTION(InConstruction(), "Only allowed in construction phase");
nsRefPtr<CanvasLayer> layer = new BasicCanvasLayer(this);
return layer.forget();
}
already_AddRefed<CanvasLayer>
BasicShadowLayerManager::CreateCanvasLayer()
{
NS_ASSERTION(InConstruction(), "Only allowed in construction phase");
nsRefPtr<BasicShadowableCanvasLayer> layer =
new BasicShadowableCanvasLayer(this);
MAYBE_CREATE_SHADOW(Canvas);
return layer.forget();
}
already_AddRefed<ShadowCanvasLayer>
BasicShadowLayerManager::CreateShadowCanvasLayer()
{
NS_ASSERTION(InConstruction(), "Only allowed in construction phase");
nsRefPtr<ShadowCanvasLayer> layer = new BasicShadowCanvasLayer(this);
return layer.forget();
}
}
}