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gecko-dev/gfx/layers/client/ContentClient.cpp

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/* -*- 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 "mozilla/layers/ContentClient.h"
#include "BasicLayers.h" // for BasicLayerManager
#include "Layers.h" // for ThebesLayer, Layer, etc
#include "gfxColor.h" // for gfxRGBA
#include "gfxContext.h" // for gfxContext, etc
#include "gfxPlatform.h" // for gfxPlatform
#include "gfxPoint.h" // for gfxIntSize, gfxPoint
#include "gfxTeeSurface.h" // for gfxTeeSurface
#include "gfxUtils.h" // for gfxUtils
#include "ipc/ShadowLayers.h" // for ShadowLayerForwarder
#include "mozilla/Util.h" // for ArrayLength
#include "mozilla/gfx/2D.h" // for DrawTarget, Factory
#include "mozilla/gfx/BasePoint.h" // for BasePoint
#include "mozilla/gfx/BaseSize.h" // for BaseSize
#include "mozilla/gfx/Rect.h" // for Rect
#include "mozilla/gfx/Types.h"
#include "mozilla/layers/LayerManagerComposite.h"
#include "mozilla/layers/LayersMessages.h" // for ThebesBufferData
#include "mozilla/layers/LayersTypes.h"
#include "nsAutoPtr.h" // for nsRefPtr
#include "nsDebug.h" // for NS_ASSERTION, NS_WARNING, etc
#include "nsISupportsImpl.h" // for gfxContext::Release, etc
#include "nsIWidget.h" // for nsIWidget
#include "prenv.h" // for PR_GetEnv
#ifdef XP_WIN
#include "gfxWindowsPlatform.h"
#endif
namespace mozilla {
using namespace gfx;
namespace layers {
/* static */ TemporaryRef<ContentClient>
ContentClient::CreateContentClient(CompositableForwarder* aForwarder)
{
LayersBackend backend = aForwarder->GetCompositorBackendType();
if (backend != LAYERS_OPENGL &&
backend != LAYERS_D3D9 &&
backend != LAYERS_D3D11 &&
backend != LAYERS_BASIC) {
return nullptr;
}
bool useDoubleBuffering = false;
#ifdef XP_WIN
if (backend == LAYERS_D3D11) {
useDoubleBuffering = !!gfxWindowsPlatform::GetPlatform()->GetD2DDevice();
} else
#endif
{
useDoubleBuffering = LayerManagerComposite::SupportsDirectTexturing() ||
backend == LAYERS_BASIC;
}
if (useDoubleBuffering || PR_GetEnv("MOZ_FORCE_DOUBLE_BUFFERING")) {
return new ContentClientDoubleBuffered(aForwarder);
}
#ifdef XP_MACOSX
if (backend == LAYERS_OPENGL) {
return new ContentClientIncremental(aForwarder);
}
#endif
return new ContentClientSingleBuffered(aForwarder);
}
ContentClientBasic::ContentClientBasic(CompositableForwarder* aForwarder,
BasicLayerManager* aManager)
: ContentClient(aForwarder), ThebesLayerBuffer(ContainsVisibleBounds), mManager(aManager)
{}
void
ContentClientBasic::CreateBuffer(ContentType aType,
const nsIntRect& aRect,
uint32_t aFlags,
gfxASurface** aBlackSurface,
gfxASurface** aWhiteSurface,
RefPtr<gfx::DrawTarget>* aBlackDT,
RefPtr<gfx::DrawTarget>* aWhiteDT)
{
MOZ_ASSERT(!(aFlags & BUFFER_COMPONENT_ALPHA));
if (gfxPlatform::GetPlatform()->SupportsAzureContent()) {
gfxASurface::gfxImageFormat format =
gfxPlatform::GetPlatform()->OptimalFormatForContent(aType);
*aBlackDT = gfxPlatform::GetPlatform()->CreateOffscreenContentDrawTarget(
IntSize(aRect.width, aRect.height),
ImageFormatToSurfaceFormat(format));
return;
}
nsRefPtr<gfxASurface> referenceSurface = GetBuffer();
if (!referenceSurface) {
gfxContext* defaultTarget = mManager->GetDefaultTarget();
if (defaultTarget) {
referenceSurface = defaultTarget->CurrentSurface();
} else {
nsIWidget* widget = mManager->GetRetainerWidget();
if (!widget || !(referenceSurface = widget->GetThebesSurface())) {
referenceSurface = mManager->GetTarget()->CurrentSurface();
}
}
}
nsRefPtr<gfxASurface> ret = referenceSurface->CreateSimilarSurface(
aType, gfxIntSize(aRect.width, aRect.height));
*aBlackSurface = ret.forget().get();
}
void
ContentClientRemoteBuffer::DestroyBuffers()
{
if (!mDeprecatedTextureClient) {
return;
}
MOZ_ASSERT(mDeprecatedTextureClient->GetAccessMode() == DeprecatedTextureClient::ACCESS_READ_WRITE);
mDeprecatedTextureClient = nullptr;
mDeprecatedTextureClientOnWhite = nullptr;
DestroyFrontBuffer();
mForwarder->DestroyThebesBuffer(this);
}
void
ContentClientRemoteBuffer::BeginPaint()
{
// XXX: So we might not have a DeprecatedTextureClient yet.. because it will
// only be created by CreateBuffer.. which will deliver a locked surface!.
if (mDeprecatedTextureClient) {
SetBufferProvider(mDeprecatedTextureClient);
}
if (mDeprecatedTextureClientOnWhite) {
SetBufferProviderOnWhite(mDeprecatedTextureClientOnWhite);
}
}
void
ContentClientRemoteBuffer::EndPaint()
{
// XXX: We might still not have a texture client if PaintThebes
// decided we didn't need one yet because the region to draw was empty.
SetBufferProvider(nullptr);
SetBufferProviderOnWhite(nullptr);
mOldTextures.Clear();
if (mDeprecatedTextureClient) {
mDeprecatedTextureClient->Unlock();
}
if (mDeprecatedTextureClientOnWhite) {
mDeprecatedTextureClientOnWhite->Unlock();
}
}
bool
ContentClientRemoteBuffer::CreateAndAllocateDeprecatedTextureClient(RefPtr<DeprecatedTextureClient>& aClient)
{
aClient = CreateDeprecatedTextureClient(TEXTURE_CONTENT);
MOZ_ASSERT(aClient, "Failed to create texture client");
if (!aClient->EnsureAllocated(mSize, mContentType)) {
aClient = CreateDeprecatedTextureClient(TEXTURE_FALLBACK);
MOZ_ASSERT(aClient, "Failed to create texture client");
if (!aClient->EnsureAllocated(mSize, mContentType)) {
NS_WARNING("Could not allocate texture client");
return false;
}
}
MOZ_ASSERT(IsSurfaceDescriptorValid(*aClient->GetDescriptor()));
return true;
}
void
ContentClientRemoteBuffer::BuildDeprecatedTextureClients(ContentType aType,
const nsIntRect& aRect,
uint32_t aFlags)
{
NS_ABORT_IF_FALSE(!mIsNewBuffer,
"Bad! Did we create a buffer twice without painting?");
mIsNewBuffer = true;
if (mDeprecatedTextureClient) {
mOldTextures.AppendElement(mDeprecatedTextureClient);
if (mDeprecatedTextureClientOnWhite) {
mOldTextures.AppendElement(mDeprecatedTextureClientOnWhite);
}
DestroyBuffers();
}
mContentType = aType;
mSize = gfx::IntSize(aRect.width, aRect.height);
mTextureInfo.mTextureFlags = aFlags | TEXTURE_DEALLOCATE_HOST;
if (!CreateAndAllocateDeprecatedTextureClient(mDeprecatedTextureClient)) {
return;
}
if (aFlags & BUFFER_COMPONENT_ALPHA) {
if (!CreateAndAllocateDeprecatedTextureClient(mDeprecatedTextureClientOnWhite)) {
return;
}
mTextureInfo.mTextureFlags |= TEXTURE_COMPONENT_ALPHA;
}
CreateFrontBufferAndNotify(aRect);
}
bool
ContentClientBasic::SupportsAzureContent() const
{
return gfxPlatform::GetPlatform()->SupportsAzureContent();
}
bool
ContentClientRemoteBuffer::SupportsAzureContent() const
{
MOZ_ASSERT(mDeprecatedTextureClient);
return gfxPlatform::GetPlatform()->SupportsAzureContentForType(
mDeprecatedTextureClient->BackendType());
}
void
ContentClientRemoteBuffer::CreateBuffer(ContentType aType,
const nsIntRect& aRect,
uint32_t aFlags,
gfxASurface** aBlackSurface,
gfxASurface** aWhiteSurface,
RefPtr<gfx::DrawTarget>* aBlackDT,
RefPtr<gfx::DrawTarget>* aWhiteDT)
{
BuildDeprecatedTextureClients(aType, aRect, aFlags);
if (gfxPlatform::GetPlatform()->SupportsAzureContentForType(
mDeprecatedTextureClient->BackendType())) {
*aBlackDT = mDeprecatedTextureClient->LockDrawTarget();
if (aFlags & BUFFER_COMPONENT_ALPHA) {
*aWhiteDT = mDeprecatedTextureClientOnWhite->LockDrawTarget();
}
} else {
nsRefPtr<gfxASurface> ret = mDeprecatedTextureClient->LockSurface();
*aBlackSurface = ret.forget().get();
if (aFlags & BUFFER_COMPONENT_ALPHA) {
nsRefPtr<gfxASurface> retWhite = mDeprecatedTextureClientOnWhite->LockSurface();
*aWhiteSurface = retWhite.forget().get();
}
}
}
nsIntRegion
ContentClientRemoteBuffer::GetUpdatedRegion(const nsIntRegion& aRegionToDraw,
const nsIntRegion& aVisibleRegion,
bool aDidSelfCopy)
{
nsIntRegion updatedRegion;
if (mIsNewBuffer || aDidSelfCopy) {
// A buffer reallocation clears both buffers. The front buffer has all the
// content by now, but the back buffer is still clear. Here, in effect, we
// are saying to copy all of the pixels of the front buffer to the back.
// Also when we self-copied in the buffer, the buffer space
// changes and some changed buffer content isn't reflected in the
// draw or invalidate region (on purpose!). When this happens, we
// need to read back the entire buffer too.
updatedRegion = aVisibleRegion;
mIsNewBuffer = false;
} else {
updatedRegion = aRegionToDraw;
}
NS_ASSERTION(BufferRect().Contains(aRegionToDraw.GetBounds()),
"Update outside of buffer rect!");
NS_ABORT_IF_FALSE(mDeprecatedTextureClient, "should have a back buffer by now");
return updatedRegion;
}
void
ContentClientRemoteBuffer::Updated(const nsIntRegion& aRegionToDraw,
const nsIntRegion& aVisibleRegion,
bool aDidSelfCopy)
{
nsIntRegion updatedRegion = GetUpdatedRegion(aRegionToDraw,
aVisibleRegion,
aDidSelfCopy);
MOZ_ASSERT(mDeprecatedTextureClient);
mDeprecatedTextureClient->SetAccessMode(DeprecatedTextureClient::ACCESS_NONE);
if (mDeprecatedTextureClientOnWhite) {
mDeprecatedTextureClientOnWhite->SetAccessMode(DeprecatedTextureClient::ACCESS_NONE);
}
LockFrontBuffer();
mForwarder->UpdateTextureRegion(this,
ThebesBufferData(BufferRect(),
BufferRotation()),
updatedRegion);
}
void
ContentClientRemoteBuffer::SwapBuffers(const nsIntRegion& aFrontUpdatedRegion)
{
MOZ_ASSERT(mDeprecatedTextureClient->GetAccessMode() == DeprecatedTextureClient::ACCESS_NONE);
MOZ_ASSERT(!mDeprecatedTextureClientOnWhite || mDeprecatedTextureClientOnWhite->GetAccessMode() == DeprecatedTextureClient::ACCESS_NONE);
MOZ_ASSERT(mDeprecatedTextureClient);
mFrontAndBackBufferDiffer = true;
mDeprecatedTextureClient->SetAccessMode(DeprecatedTextureClient::ACCESS_READ_WRITE);
if (mDeprecatedTextureClientOnWhite) {
mDeprecatedTextureClientOnWhite->SetAccessMode(DeprecatedTextureClient::ACCESS_READ_WRITE);
}
}
ContentClientDoubleBuffered::~ContentClientDoubleBuffered()
{
if (mDeprecatedTextureClient) {
MOZ_ASSERT(mFrontClient);
mDeprecatedTextureClient->SetDescriptor(SurfaceDescriptor());
mFrontClient->SetDescriptor(SurfaceDescriptor());
}
if (mDeprecatedTextureClientOnWhite) {
MOZ_ASSERT(mFrontClientOnWhite);
mDeprecatedTextureClientOnWhite->SetDescriptor(SurfaceDescriptor());
mFrontClientOnWhite->SetDescriptor(SurfaceDescriptor());
}
}
void
ContentClientDoubleBuffered::CreateFrontBufferAndNotify(const nsIntRect& aBufferRect)
{
if (!CreateAndAllocateDeprecatedTextureClient(mFrontClient)) {
return;
}
if (mTextureInfo.mTextureFlags & TEXTURE_COMPONENT_ALPHA) {
if (!CreateAndAllocateDeprecatedTextureClient(mFrontClientOnWhite)) {
return;
}
}
mFrontBufferRect = aBufferRect;
mFrontBufferRotation = nsIntPoint();
mForwarder->CreatedDoubleBuffer(this,
*mFrontClient->GetDescriptor(),
*mDeprecatedTextureClient->GetDescriptor(),
mTextureInfo,
mFrontClientOnWhite ? mFrontClientOnWhite->GetDescriptor() : nullptr,
mDeprecatedTextureClientOnWhite ? mDeprecatedTextureClientOnWhite->GetDescriptor() : nullptr);
}
void
ContentClientDoubleBuffered::DestroyFrontBuffer()
{
MOZ_ASSERT(mFrontClient);
MOZ_ASSERT(mFrontClient->GetAccessMode() != DeprecatedTextureClient::ACCESS_NONE);
mFrontClient = nullptr;
mFrontClientOnWhite = nullptr;
}
void
ContentClientDoubleBuffered::LockFrontBuffer()
{
MOZ_ASSERT(mFrontClient);
mFrontClient->SetAccessMode(DeprecatedTextureClient::ACCESS_NONE);
if (mFrontClientOnWhite) {
mFrontClientOnWhite->SetAccessMode(DeprecatedTextureClient::ACCESS_NONE);
}
}
void
ContentClientDoubleBuffered::SwapBuffers(const nsIntRegion& aFrontUpdatedRegion)
{
mFrontUpdatedRegion = aFrontUpdatedRegion;
RefPtr<DeprecatedTextureClient> oldBack = mDeprecatedTextureClient;
mDeprecatedTextureClient = mFrontClient;
mFrontClient = oldBack;
oldBack = mDeprecatedTextureClientOnWhite;
mDeprecatedTextureClientOnWhite = mFrontClientOnWhite;
mFrontClientOnWhite = oldBack;
nsIntRect oldBufferRect = mBufferRect;
mBufferRect = mFrontBufferRect;
mFrontBufferRect = oldBufferRect;
nsIntPoint oldBufferRotation = mBufferRotation;
mBufferRotation = mFrontBufferRotation;
mFrontBufferRotation = oldBufferRotation;
MOZ_ASSERT(mFrontClient);
mFrontClient->SetAccessMode(DeprecatedTextureClient::ACCESS_READ_ONLY);
if (mFrontClientOnWhite) {
mFrontClientOnWhite->SetAccessMode(DeprecatedTextureClient::ACCESS_READ_ONLY);
}
ContentClientRemoteBuffer::SwapBuffers(aFrontUpdatedRegion);
}
struct AutoDeprecatedTextureClient {
AutoDeprecatedTextureClient()
: mTexture(nullptr)
{}
~AutoDeprecatedTextureClient()
{
if (mTexture) {
mTexture->Unlock();
}
}
gfxASurface* GetSurface(DeprecatedTextureClient* aTexture)
{
MOZ_ASSERT(!mTexture);
mTexture = aTexture;
if (mTexture) {
return mTexture->LockSurface();
}
return nullptr;
}
DrawTarget* GetDrawTarget(DeprecatedTextureClient* aTexture)
{
MOZ_ASSERT(!mTexture);
mTexture = aTexture;
if (mTexture) {
return mTexture->LockDrawTarget();
}
return nullptr;
}
private:
DeprecatedTextureClient* mTexture;
};
void
ContentClientDoubleBuffered::SyncFrontBufferToBackBuffer()
{
if (!mFrontAndBackBufferDiffer) {
return;
}
MOZ_ASSERT(mFrontClient);
MOZ_ASSERT(mFrontClient->GetAccessMode() == DeprecatedTextureClient::ACCESS_READ_ONLY);
MOZ_ASSERT(!mFrontClientOnWhite ||
mFrontClientOnWhite->GetAccessMode() == DeprecatedTextureClient::ACCESS_READ_ONLY);
MOZ_LAYERS_LOG(("BasicShadowableThebes(%p): reading back <x=%d,y=%d,w=%d,h=%d>",
this,
mFrontUpdatedRegion.GetBounds().x,
mFrontUpdatedRegion.GetBounds().y,
mFrontUpdatedRegion.GetBounds().width,
mFrontUpdatedRegion.GetBounds().height));
nsIntRegion updateRegion = mFrontUpdatedRegion;
int32_t xBoundary = mBufferRect.XMost() - mBufferRotation.x;
int32_t yBoundary = mBufferRect.YMost() - mBufferRotation.y;
// Figure out whether the area we want to copy wraps the edges of our buffer.
bool needFullCopy = (xBoundary < updateRegion.GetBounds().XMost() &&
xBoundary > updateRegion.GetBounds().x) ||
(yBoundary < updateRegion.GetBounds().YMost() &&
yBoundary > updateRegion.GetBounds().y);
// This is a tricky trade off, we're going to get stuff out of our
// frontbuffer now, but the next PaintThebes might throw it all (or mostly)
// away if the visible region has changed. This is why in reality we want
// this code integrated with PaintThebes to always do the optimal thing.
if (needFullCopy) {
// We can't easily draw our front buffer into us, since we're going to be
// copying stuff around anyway it's easiest if we just move our situation
// to non-rotated while we're at it. If this situation occurs we'll have
// hit a self-copy path in PaintThebes before as well anyway.
mBufferRect.MoveTo(mFrontBufferRect.TopLeft());
mBufferRotation = nsIntPoint();
updateRegion = mBufferRect;
} else {
mBufferRect = mFrontBufferRect;
mBufferRotation = mFrontBufferRotation;
}
AutoDeprecatedTextureClient autoTextureFront;
AutoDeprecatedTextureClient autoTextureFrontOnWhite;
if (SupportsAzureContent()) {
// We need to ensure that we lock these two buffers in the same
// order as the compositor to prevent deadlocks.
DrawTarget* dt = autoTextureFront.GetDrawTarget(mFrontClient);
DrawTarget* dtOnWhite = autoTextureFrontOnWhite.GetDrawTarget(mFrontClientOnWhite);
RotatedBuffer frontBuffer(dt,
dtOnWhite,
mFrontBufferRect,
mFrontBufferRotation);
UpdateDestinationFrom(frontBuffer, updateRegion);
} else {
gfxASurface* surf = autoTextureFront.GetSurface(mFrontClient);
gfxASurface* surfOnWhite = autoTextureFrontOnWhite.GetSurface(mFrontClientOnWhite);
RotatedBuffer frontBuffer(surf,
surfOnWhite,
mFrontBufferRect,
mFrontBufferRotation);
UpdateDestinationFrom(frontBuffer, updateRegion);
}
mIsNewBuffer = false;
mFrontAndBackBufferDiffer = false;
}
void
ContentClientDoubleBuffered::UpdateDestinationFrom(const RotatedBuffer& aSource,
const nsIntRegion& aUpdateRegion)
{
nsRefPtr<gfxContext> destCtx =
GetContextForQuadrantUpdate(aUpdateRegion.GetBounds(), BUFFER_BLACK);
destCtx->SetOperator(gfxContext::OPERATOR_SOURCE);
bool isClippingCheap = IsClippingCheap(destCtx, aUpdateRegion);
if (isClippingCheap) {
gfxUtils::ClipToRegion(destCtx, aUpdateRegion);
}
if (SupportsAzureContent()) {
MOZ_ASSERT(!destCtx->IsCairo());
aSource.DrawBufferWithRotation(destCtx->GetDrawTarget(), BUFFER_BLACK, 1.0, OP_SOURCE);
} else {
aSource.DrawBufferWithRotation(destCtx, BUFFER_BLACK);
}
if (aSource.HaveBufferOnWhite()) {
MOZ_ASSERT(HaveBufferOnWhite());
nsRefPtr<gfxContext> destCtx =
GetContextForQuadrantUpdate(aUpdateRegion.GetBounds(), BUFFER_WHITE);
destCtx->SetOperator(gfxContext::OPERATOR_SOURCE);
bool isClippingCheap = IsClippingCheap(destCtx, aUpdateRegion);
if (isClippingCheap) {
gfxUtils::ClipToRegion(destCtx, aUpdateRegion);
}
if (SupportsAzureContent()) {
MOZ_ASSERT(!destCtx->IsCairo());
aSource.DrawBufferWithRotation(destCtx->GetDrawTarget(), BUFFER_WHITE, 1.0, OP_SOURCE);
} else {
aSource.DrawBufferWithRotation(destCtx, BUFFER_WHITE);
}
}
}
ContentClientSingleBuffered::~ContentClientSingleBuffered()
{
if (mDeprecatedTextureClient) {
mDeprecatedTextureClient->SetDescriptor(SurfaceDescriptor());
}
if (mDeprecatedTextureClientOnWhite) {
mDeprecatedTextureClientOnWhite->SetDescriptor(SurfaceDescriptor());
}
}
void
ContentClientSingleBuffered::CreateFrontBufferAndNotify(const nsIntRect& aBufferRect)
{
mForwarder->CreatedSingleBuffer(this,
*mDeprecatedTextureClient->GetDescriptor(),
mTextureInfo,
mDeprecatedTextureClientOnWhite ? mDeprecatedTextureClientOnWhite->GetDescriptor() : nullptr);
}
void
ContentClientSingleBuffered::SyncFrontBufferToBackBuffer()
{
if (!mFrontAndBackBufferDiffer) {
return;
}
if (SupportsAzureContent()) {
DrawTarget* backBuffer = GetDTBuffer();
if (!backBuffer && mDeprecatedTextureClient) {
backBuffer = mDeprecatedTextureClient->LockDrawTarget();
}
RefPtr<DrawTarget> oldBuffer;
oldBuffer = SetDTBuffer(backBuffer,
mBufferRect,
mBufferRotation);
backBuffer = GetDTBufferOnWhite();
if (!backBuffer && mDeprecatedTextureClientOnWhite) {
backBuffer = mDeprecatedTextureClientOnWhite->LockDrawTarget();
}
oldBuffer = SetDTBufferOnWhite(backBuffer);
} else {
gfxASurface* backBuffer = GetBuffer();
if (!backBuffer && mDeprecatedTextureClient) {
backBuffer = mDeprecatedTextureClient->LockSurface();
}
nsRefPtr<gfxASurface> oldBuffer;
oldBuffer = SetBuffer(backBuffer,
mBufferRect,
mBufferRotation);
backBuffer = GetBufferOnWhite();
if (!backBuffer && mDeprecatedTextureClientOnWhite) {
backBuffer = mDeprecatedTextureClientOnWhite->LockSurface();
}
oldBuffer = SetBufferOnWhite(backBuffer);
}
mIsNewBuffer = false;
mFrontAndBackBufferDiffer = false;
}
static void
WrapRotationAxis(int32_t* aRotationPoint, int32_t aSize)
{
if (*aRotationPoint < 0) {
*aRotationPoint += aSize;
} else if (*aRotationPoint >= aSize) {
*aRotationPoint -= aSize;
}
}
static void
FillSurface(gfxASurface* aSurface, const nsIntRegion& aRegion,
const nsIntPoint& aOffset, const gfxRGBA& aColor)
{
nsRefPtr<gfxContext> ctx = new gfxContext(aSurface);
ctx->Translate(-gfxPoint(aOffset.x, aOffset.y));
gfxUtils::ClipToRegion(ctx, aRegion);
ctx->SetColor(aColor);
ctx->Paint();
}
ThebesLayerBuffer::PaintState
ContentClientIncremental::BeginPaintBuffer(ThebesLayer* aLayer,
ThebesLayerBuffer::ContentType aContentType,
uint32_t aFlags)
{
mTextureInfo.mDeprecatedTextureHostFlags = 0;
PaintState result;
// We need to disable rotation if we're going to be resampled when
// drawing, because we might sample across the rotation boundary.
bool canHaveRotation = !(aFlags & ThebesLayerBuffer::PAINT_WILL_RESAMPLE);
nsIntRegion validRegion = aLayer->GetValidRegion();
Layer::SurfaceMode mode;
ContentType contentType;
nsIntRegion neededRegion;
bool canReuseBuffer;
nsIntRect destBufferRect;
while (true) {
mode = aLayer->GetSurfaceMode();
contentType = aContentType;
neededRegion = aLayer->GetVisibleRegion();
// If we're going to resample, we need a buffer that's in clamp mode.
canReuseBuffer = neededRegion.GetBounds().Size() <= mBufferRect.Size() &&
mHasBuffer &&
(!(aFlags & ThebesLayerBuffer::PAINT_WILL_RESAMPLE) ||
!(mTextureInfo.mTextureFlags & TEXTURE_ALLOW_REPEAT));
if (canReuseBuffer) {
if (mBufferRect.Contains(neededRegion.GetBounds())) {
// We don't need to adjust mBufferRect.
destBufferRect = mBufferRect;
} else {
// The buffer's big enough but doesn't contain everything that's
// going to be visible. We'll move it.
destBufferRect = nsIntRect(neededRegion.GetBounds().TopLeft(), mBufferRect.Size());
}
} else {
destBufferRect = neededRegion.GetBounds();
}
if (mode == Layer::SURFACE_COMPONENT_ALPHA) {
if (!gfxPlatform::ComponentAlphaEnabled() ||
!aLayer->GetParent() ||
!aLayer->GetParent()->SupportsComponentAlphaChildren()) {
mode = Layer::SURFACE_SINGLE_CHANNEL_ALPHA;
} else {
contentType = gfxASurface::CONTENT_COLOR;
}
}
if ((aFlags & ThebesLayerBuffer::PAINT_WILL_RESAMPLE) &&
(!neededRegion.GetBounds().IsEqualInterior(destBufferRect) ||
neededRegion.GetNumRects() > 1)) {
// The area we add to neededRegion might not be painted opaquely
if (mode == Layer::SURFACE_OPAQUE) {
contentType = gfxASurface::CONTENT_COLOR_ALPHA;
mode = Layer::SURFACE_SINGLE_CHANNEL_ALPHA;
}
// For component alpha layers, we leave contentType as CONTENT_COLOR.
// We need to validate the entire buffer, to make sure that only valid
// pixels are sampled
neededRegion = destBufferRect;
}
if (mHasBuffer &&
(mContentType != contentType ||
(mode == Layer::SURFACE_COMPONENT_ALPHA) != mHasBufferOnWhite)) {
// We're effectively clearing the valid region, so we need to draw
// the entire needed region now.
result.mRegionToInvalidate = aLayer->GetValidRegion();
validRegion.SetEmpty();
mHasBuffer = false;
mHasBufferOnWhite = false;
mBufferRect.SetRect(0, 0, 0, 0);
mBufferRotation.MoveTo(0, 0);
// Restart decision process with the cleared buffer. We can only go
// around the loop one more iteration, since mTexImage is null now.
continue;
}
break;
}
result.mRegionToDraw.Sub(neededRegion, validRegion);
if (result.mRegionToDraw.IsEmpty())
return result;
if (destBufferRect.width > mForwarder->GetMaxTextureSize() ||
destBufferRect.height > mForwarder->GetMaxTextureSize()) {
return result;
}
// BlitTextureImage depends on the FBO texture target being
// TEXTURE_2D. This isn't the case on some older X1600-era Radeons.
if (!mForwarder->SupportsTextureBlitting() ||
!mForwarder->SupportsPartialUploads()) {
result.mRegionToDraw = neededRegion;
validRegion.SetEmpty();
mHasBuffer = false;
mHasBufferOnWhite = false;
mBufferRect.SetRect(0, 0, 0, 0);
mBufferRotation.MoveTo(0, 0);
canReuseBuffer = false;
}
nsIntRect drawBounds = result.mRegionToDraw.GetBounds();
bool createdBuffer = false;
uint32_t bufferFlags = canHaveRotation ? TEXTURE_ALLOW_REPEAT : 0;
if (mode == Layer::SURFACE_COMPONENT_ALPHA) {
bufferFlags |= TEXTURE_COMPONENT_ALPHA;
}
if (canReuseBuffer) {
nsIntRect keepArea;
if (keepArea.IntersectRect(destBufferRect, mBufferRect)) {
// Set mBufferRotation so that the pixels currently in mBuffer
// will still be rendered in the right place when mBufferRect
// changes to destBufferRect.
nsIntPoint newRotation = mBufferRotation +
(destBufferRect.TopLeft() - mBufferRect.TopLeft());
WrapRotationAxis(&newRotation.x, mBufferRect.width);
WrapRotationAxis(&newRotation.y, mBufferRect.height);
NS_ASSERTION(nsIntRect(nsIntPoint(0,0), mBufferRect.Size()).Contains(newRotation),
"newRotation out of bounds");
int32_t xBoundary = destBufferRect.XMost() - newRotation.x;
int32_t yBoundary = destBufferRect.YMost() - newRotation.y;
if ((drawBounds.x < xBoundary && xBoundary < drawBounds.XMost()) ||
(drawBounds.y < yBoundary && yBoundary < drawBounds.YMost()) ||
(newRotation != nsIntPoint(0,0) && !canHaveRotation)) {
// The stuff we need to redraw will wrap around an edge of the
// buffer, so we will need to do a self-copy
// If mBufferRotation == nsIntPoint(0,0) we could do a real
// self-copy but we're not going to do that in GL yet.
// We can't do a real self-copy because the buffer is rotated.
// So allocate a new buffer for the destination.
destBufferRect = neededRegion.GetBounds();
createdBuffer = true;
} else {
mBufferRect = destBufferRect;
mBufferRotation = newRotation;
}
} else {
// No pixels are going to be kept. The whole visible region
// will be redrawn, so we don't need to copy anything, so we don't
// set destBuffer.
mBufferRect = destBufferRect;
mBufferRotation = nsIntPoint(0,0);
}
} else {
// The buffer's not big enough, so allocate a new one
createdBuffer = true;
}
NS_ASSERTION(!(aFlags & ThebesLayerBuffer::PAINT_WILL_RESAMPLE) ||
destBufferRect == neededRegion.GetBounds(),
"If we're resampling, we need to validate the entire buffer");
if (!createdBuffer && !mHasBuffer) {
return result;
}
if (createdBuffer) {
if (mHasBuffer &&
(mode != Layer::SURFACE_COMPONENT_ALPHA || mHasBufferOnWhite)) {
mTextureInfo.mDeprecatedTextureHostFlags = TEXTURE_HOST_COPY_PREVIOUS;
}
mHasBuffer = true;
if (mode == Layer::SURFACE_COMPONENT_ALPHA) {
mHasBufferOnWhite = true;
}
mBufferRect = destBufferRect;
mBufferRotation = nsIntPoint(0,0);
NotifyBufferCreated(contentType, bufferFlags);
}
NS_ASSERTION(canHaveRotation || mBufferRotation == nsIntPoint(0,0),
"Rotation disabled, but we have nonzero rotation?");
nsIntRegion invalidate;
invalidate.Sub(aLayer->GetValidRegion(), destBufferRect);
result.mRegionToInvalidate.Or(result.mRegionToInvalidate, invalidate);
// BeginUpdate is allowed to modify the given region,
// if it wants more to be repainted than we request.
if (mode == Layer::SURFACE_COMPONENT_ALPHA) {
nsIntRegion drawRegionCopy = result.mRegionToDraw;
nsRefPtr<gfxASurface> onBlack = GetUpdateSurface(BUFFER_BLACK, drawRegionCopy);
nsRefPtr<gfxASurface> onWhite = GetUpdateSurface(BUFFER_WHITE, result.mRegionToDraw);
if (onBlack && onWhite) {
NS_ASSERTION(result.mRegionToDraw == drawRegionCopy,
"BeginUpdate should always modify the draw region in the same way!");
FillSurface(onBlack, result.mRegionToDraw, nsIntPoint(drawBounds.x, drawBounds.y), gfxRGBA(0.0, 0.0, 0.0, 1.0));
FillSurface(onWhite, result.mRegionToDraw, nsIntPoint(drawBounds.x, drawBounds.y), gfxRGBA(1.0, 1.0, 1.0, 1.0));
if (RefPtr<DrawTarget> onBlackDT = gfxPlatform::GetPlatform()->CreateDrawTargetForUpdateSurface(onBlack, onBlack->GetSize())) {
RefPtr<DrawTarget> onWhiteDT = gfxPlatform::GetPlatform()->CreateDrawTargetForUpdateSurface(onWhite, onWhite->GetSize());
RefPtr<DrawTarget> dt = Factory::CreateDualDrawTarget(onBlackDT, onWhiteDT);
result.mContext = new gfxContext(dt);
} else {
gfxASurface* surfaces[2] = { onBlack.get(), onWhite.get() };
nsRefPtr<gfxTeeSurface> surf = new gfxTeeSurface(surfaces, ArrayLength(surfaces));
// XXX If the device offset is set on the individual surfaces instead of on
// the tee surface, we render in the wrong place. Why?
gfxPoint deviceOffset = onBlack->GetDeviceOffset();
onBlack->SetDeviceOffset(gfxPoint(0, 0));
onWhite->SetDeviceOffset(gfxPoint(0, 0));
surf->SetDeviceOffset(deviceOffset);
// Using this surface as a source will likely go horribly wrong, since
// only the onBlack surface will really be used, so alpha information will
// be incorrect.
surf->SetAllowUseAsSource(false);
result.mContext = new gfxContext(surf);
}
} else {
result.mContext = nullptr;
}
} else {
nsRefPtr<gfxASurface> surf = GetUpdateSurface(BUFFER_BLACK, result.mRegionToDraw);
if (RefPtr<DrawTarget> dt = gfxPlatform::GetPlatform()->CreateDrawTargetForUpdateSurface(surf, surf->GetSize())) {
result.mContext = new gfxContext(dt);
} else {
result.mContext = new gfxContext(surf);
}
}
if (!result.mContext) {
NS_WARNING("unable to get context for update");
return result;
}
result.mContext->Translate(-gfxPoint(drawBounds.x, drawBounds.y));
// If we do partial updates, we have to clip drawing to the regionToDraw.
// If we don't clip, background images will be fillrect'd to the region correctly,
// while text or lines will paint outside of the regionToDraw. This becomes apparent
// with concave regions. Right now the scrollbars invalidate a narrow strip of the bar
// although they never cover it. This leads to two draw rects, the narow strip and the actually
// newly exposed area. It would be wise to fix this glitch in any way to have simpler
// clip and draw regions.
gfxUtils::ClipToRegion(result.mContext, result.mRegionToDraw);
if (mContentType == gfxASurface::CONTENT_COLOR_ALPHA) {
result.mContext->SetOperator(gfxContext::OPERATOR_CLEAR);
result.mContext->Paint();
result.mContext->SetOperator(gfxContext::OPERATOR_OVER);
}
return result;
}
void
ContentClientIncremental::Updated(const nsIntRegion& aRegionToDraw,
const nsIntRegion& aVisibleRegion,
bool aDidSelfCopy)
{
if (IsSurfaceDescriptorValid(mUpdateDescriptor)) {
ShadowLayerForwarder::CloseDescriptor(mUpdateDescriptor);
mForwarder->UpdateTextureIncremental(this,
TextureFront,
mUpdateDescriptor,
aRegionToDraw,
mBufferRect,
mBufferRotation);
mUpdateDescriptor = SurfaceDescriptor();
}
if (IsSurfaceDescriptorValid(mUpdateDescriptorOnWhite)) {
ShadowLayerForwarder::CloseDescriptor(mUpdateDescriptorOnWhite);
mForwarder->UpdateTextureIncremental(this,
TextureOnWhiteFront,
mUpdateDescriptorOnWhite,
aRegionToDraw,
mBufferRect,
mBufferRotation);
mUpdateDescriptorOnWhite = SurfaceDescriptor();
}
}
already_AddRefed<gfxASurface>
ContentClientIncremental::GetUpdateSurface(BufferType aType,
nsIntRegion& aUpdateRegion)
{
nsIntRect rgnSize = aUpdateRegion.GetBounds();
if (!mBufferRect.Contains(rgnSize)) {
NS_ERROR("update outside of image");
return nullptr;
}
SurfaceDescriptor desc;
if (!mForwarder->AllocSurfaceDescriptor(gfxIntSize(rgnSize.width, rgnSize.height),
mContentType,
&desc)) {
NS_WARNING("creating SurfaceDescriptor failed!");
return nullptr;
}
nsRefPtr<gfxASurface> tmpASurface =
ShadowLayerForwarder::OpenDescriptor(OPEN_READ_WRITE, desc);
if (aType == BUFFER_BLACK) {
MOZ_ASSERT(!IsSurfaceDescriptorValid(mUpdateDescriptor));
mUpdateDescriptor = desc;
} else {
MOZ_ASSERT(!IsSurfaceDescriptorValid(mUpdateDescriptorOnWhite));
MOZ_ASSERT(aType == BUFFER_WHITE);
mUpdateDescriptorOnWhite = desc;
}
return tmpASurface.forget();
}
}
}
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