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gecko-dev/gfx/layers/client/TiledContentClient.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/TiledContentClient.h"
#include <math.h> // for ceil, ceilf, floor
#include <algorithm>
#include "ClientTiledPaintedLayer.h" // for ClientTiledPaintedLayer
#include "GeckoProfiler.h" // for PROFILER_LABEL
#include "ClientLayerManager.h" // for ClientLayerManager
#include "gfxContext.h" // for gfxContext, etc
#include "gfxPlatform.h" // for gfxPlatform
#include "gfxPrefs.h" // for gfxPrefs
#include "gfxRect.h" // for gfxRect
#include "mozilla/MathAlgorithms.h" // for Abs
#include "mozilla/gfx/Point.h" // for IntSize
#include "mozilla/gfx/Rect.h" // for Rect
#include "mozilla/gfx/Tools.h" // for BytesPerPixel
#include "mozilla/layers/CompositableForwarder.h"
#include "mozilla/layers/CompositorBridgeChild.h" // for CompositorBridgeChild
#include "mozilla/layers/LayerMetricsWrapper.h"
#include "mozilla/layers/ShadowLayers.h" // for ShadowLayerForwarder
#include "TextureClientPool.h"
#include "nsDebug.h" // for NS_ASSERTION
#include "nsISupportsImpl.h" // for gfxContext::AddRef, etc
#include "nsExpirationTracker.h" // for nsExpirationTracker
#include "nsMathUtils.h" // for NS_lroundf
#include "LayersLogging.h"
#include "UnitTransforms.h" // for TransformTo
#include "mozilla/UniquePtr.h"
// This is the minimum area that we deem reasonable to copy from the front buffer to the
// back buffer on tile updates. If the valid region is smaller than this, we just
// redraw it and save on the copy (and requisite surface-locking involved).
#define MINIMUM_TILE_COPY_AREA (1.f/16.f)
#ifdef GFX_TILEDLAYER_DEBUG_OVERLAY
#include "cairo.h"
#include <sstream>
using mozilla::layers::Layer;
static void DrawDebugOverlay(mozilla::gfx::DrawTarget* dt, int x, int y, int width, int height)
{
gfxContext c(dt);
// Draw border
c.NewPath();
c.SetDeviceColor(Color(0.f, 0.f, 0.f));
c.Rectangle(gfxRect(0, 0, width, height));
c.Stroke();
// Build tile description
std::stringstream ss;
ss << x << ", " << y;
// Draw text using cairo toy text API
// XXX: this drawing will silently fail if |dt| doesn't have a Cairo backend
cairo_t* cr = gfxFont::RefCairo(dt);
cairo_set_font_size(cr, 25);
cairo_text_extents_t extents;
cairo_text_extents(cr, ss.str().c_str(), &extents);
int textWidth = extents.width + 6;
c.NewPath();
c.SetDeviceColor(Color(0.f, 0.f, 0.f));
c.Rectangle(gfxRect(gfxPoint(2,2),gfxSize(textWidth, 30)));
c.Fill();
c.NewPath();
c.SetDeviceColor(Color(1.0, 0.0, 0.0));
c.Rectangle(gfxRect(gfxPoint(2,2),gfxSize(textWidth, 30)));
c.Stroke();
c.NewPath();
cairo_move_to(cr, 4, 28);
cairo_show_text(cr, ss.str().c_str());
}
#endif
namespace mozilla {
using namespace gfx;
namespace layers {
MultiTiledContentClient::MultiTiledContentClient(ClientTiledPaintedLayer* aPaintedLayer,
ClientLayerManager* aManager)
: TiledContentClient(aManager, "Multi")
{
MOZ_COUNT_CTOR(MultiTiledContentClient);
mTiledBuffer = ClientMultiTiledLayerBuffer(aPaintedLayer, this, aManager,
&mSharedFrameMetricsHelper);
mLowPrecisionTiledBuffer = ClientMultiTiledLayerBuffer(aPaintedLayer, this, aManager,
&mSharedFrameMetricsHelper);
mLowPrecisionTiledBuffer.SetResolution(gfxPrefs::LowPrecisionResolution());
mHasLowPrecision = gfxPrefs::UseLowPrecisionBuffer();
}
void
MultiTiledContentClient::ClearCachedResources()
{
CompositableClient::ClearCachedResources();
mTiledBuffer.DiscardBuffers();
mLowPrecisionTiledBuffer.DiscardBuffers();
}
void
MultiTiledContentClient::UpdatedBuffer(TiledBufferType aType)
{
ClientMultiTiledLayerBuffer* buffer = aType == LOW_PRECISION_TILED_BUFFER
? &mLowPrecisionTiledBuffer
: &mTiledBuffer;
MOZ_ASSERT(aType != LOW_PRECISION_TILED_BUFFER || mHasLowPrecision);
mForwarder->UseTiledLayerBuffer(this, buffer->GetSurfaceDescriptorTiles());
buffer->ClearPaintedRegion();
}
SharedFrameMetricsHelper::SharedFrameMetricsHelper()
: mLastProgressiveUpdateWasLowPrecision(false)
, mProgressiveUpdateWasInDanger(false)
{
MOZ_COUNT_CTOR(SharedFrameMetricsHelper);
}
SharedFrameMetricsHelper::~SharedFrameMetricsHelper()
{
MOZ_COUNT_DTOR(SharedFrameMetricsHelper);
}
static inline bool
FuzzyEquals(float a, float b) {
return (fabsf(a - b) < 1e-6);
}
static AsyncTransform
ComputeViewTransform(const FrameMetrics& aContentMetrics, const FrameMetrics& aCompositorMetrics)
{
// This is basically the same code as AsyncPanZoomController::GetCurrentAsyncTransform
// but with aContentMetrics used in place of mLastContentPaintMetrics, because they
// should be equivalent, modulo race conditions while transactions are inflight.
ParentLayerPoint translation = (aCompositorMetrics.GetScrollOffset() - aContentMetrics.GetScrollOffset())
* aCompositorMetrics.GetZoom();
return AsyncTransform(aCompositorMetrics.GetAsyncZoom(), -translation);
}
bool
SharedFrameMetricsHelper::UpdateFromCompositorFrameMetrics(
const LayerMetricsWrapper& aLayer,
bool aHasPendingNewThebesContent,
bool aLowPrecision,
AsyncTransform& aViewTransform)
{
MOZ_ASSERT(aLayer);
CompositorBridgeChild* compositor = nullptr;
if (aLayer.Manager() &&
aLayer.Manager()->AsClientLayerManager()) {
compositor = aLayer.Manager()->AsClientLayerManager()->GetCompositorBridgeChild();
}
if (!compositor) {
return false;
}
const FrameMetrics& contentMetrics = aLayer.Metrics();
FrameMetrics compositorMetrics;
if (!compositor->LookupCompositorFrameMetrics(contentMetrics.GetScrollId(),
compositorMetrics)) {
return false;
}
aViewTransform = ComputeViewTransform(contentMetrics, compositorMetrics);
// Reset the checkerboard risk flag when switching to low precision
// rendering.
if (aLowPrecision && !mLastProgressiveUpdateWasLowPrecision) {
// Skip low precision rendering until we're at risk of checkerboarding.
if (!mProgressiveUpdateWasInDanger) {
TILING_LOG("TILING: Aborting low-precision rendering because not at risk of checkerboarding\n");
return true;
}
mProgressiveUpdateWasInDanger = false;
}
mLastProgressiveUpdateWasLowPrecision = aLowPrecision;
// Always abort updates if the resolution has changed. There's no use
// in drawing at the incorrect resolution.
if (!FuzzyEquals(compositorMetrics.GetZoom().xScale, contentMetrics.GetZoom().xScale) ||
!FuzzyEquals(compositorMetrics.GetZoom().yScale, contentMetrics.GetZoom().yScale)) {
TILING_LOG("TILING: Aborting because resolution changed from %s to %s\n",
ToString(contentMetrics.GetZoom()).c_str(), ToString(compositorMetrics.GetZoom()).c_str());
return true;
}
// Never abort drawing if we can't be sure we've sent a more recent
// display-port. If we abort updating when we shouldn't, we can end up
// with blank regions on the screen and we open up the risk of entering
// an endless updating cycle.
if (fabsf(contentMetrics.GetScrollOffset().x - compositorMetrics.GetScrollOffset().x) <= 2 &&
fabsf(contentMetrics.GetScrollOffset().y - compositorMetrics.GetScrollOffset().y) <= 2 &&
fabsf(contentMetrics.GetDisplayPort().x - compositorMetrics.GetDisplayPort().x) <= 2 &&
fabsf(contentMetrics.GetDisplayPort().y - compositorMetrics.GetDisplayPort().y) <= 2 &&
fabsf(contentMetrics.GetDisplayPort().width - compositorMetrics.GetDisplayPort().width) <= 2 &&
fabsf(contentMetrics.GetDisplayPort().height - compositorMetrics.GetDisplayPort().height) <= 2) {
return false;
}
// When not a low precision pass and the page is in danger of checker boarding
// abort update.
if (!aLowPrecision && !mProgressiveUpdateWasInDanger) {
bool scrollUpdatePending = contentMetrics.GetScrollOffsetUpdated() &&
contentMetrics.GetScrollGeneration() != compositorMetrics.GetScrollGeneration();
// If scrollUpdatePending is true, then that means the content-side
// metrics has a new scroll offset that is going to be forced into the
// compositor but it hasn't gotten there yet.
// Even though right now comparing the metrics might indicate we're
// about to checkerboard (and that's true), the checkerboarding will
// disappear as soon as the new scroll offset update is processed
// on the compositor side. To avoid leaving things in a low-precision
// paint, we need to detect and handle this case (bug 1026756).
if (!scrollUpdatePending && AboutToCheckerboard(contentMetrics, compositorMetrics)) {
mProgressiveUpdateWasInDanger = true;
return true;
}
}
// Abort drawing stale low-precision content if there's a more recent
// display-port in the pipeline.
if (aLowPrecision && !aHasPendingNewThebesContent) {
TILING_LOG("TILING: Aborting low-precision because of new pending content\n");
return true;
}
return false;
}
bool
SharedFrameMetricsHelper::AboutToCheckerboard(const FrameMetrics& aContentMetrics,
const FrameMetrics& aCompositorMetrics)
{
// The size of the painted area is originally computed in layer pixels in layout, but then
// converted to app units and then back to CSS pixels before being put in the FrameMetrics.
// This process can introduce some rounding error, so we inflate the rect by one app unit
// to account for that.
CSSRect painted = (aContentMetrics.GetCriticalDisplayPort().IsEmpty()
? aContentMetrics.GetDisplayPort()
: aContentMetrics.GetCriticalDisplayPort())
+ aContentMetrics.GetScrollOffset();
painted.Inflate(CSSMargin::FromAppUnits(nsMargin(1, 1, 1, 1)));
// Inflate the rect by the danger zone. See the description of the danger zone prefs
// in AsyncPanZoomController.cpp for an explanation of this.
CSSRect showing = CSSRect(aCompositorMetrics.GetScrollOffset(),
aCompositorMetrics.CalculateBoundedCompositedSizeInCssPixels());
showing.Inflate(LayerSize(gfxPrefs::APZDangerZoneX(), gfxPrefs::APZDangerZoneY())
/ aCompositorMetrics.LayersPixelsPerCSSPixel());
// Clamp both rects to the scrollable rect, because having either of those
// exceed the scrollable rect doesn't make sense, and could lead to false
// positives.
painted = painted.Intersect(aContentMetrics.GetScrollableRect());
showing = showing.Intersect(aContentMetrics.GetScrollableRect());
if (!painted.Contains(showing)) {
TILING_LOG("TILING: About to checkerboard; content %s\n", Stringify(aContentMetrics).c_str());
TILING_LOG("TILING: About to checkerboard; painted %s\n", Stringify(painted).c_str());
TILING_LOG("TILING: About to checkerboard; compositor %s\n", Stringify(aCompositorMetrics).c_str());
TILING_LOG("TILING: About to checkerboard; showing %s\n", Stringify(showing).c_str());
return true;
}
return false;
}
ClientMultiTiledLayerBuffer::ClientMultiTiledLayerBuffer(ClientTiledPaintedLayer* aPaintedLayer,
CompositableClient* aCompositableClient,
ClientLayerManager* aManager,
SharedFrameMetricsHelper* aHelper)
: ClientTiledLayerBuffer(aPaintedLayer, aCompositableClient)
, mManager(aManager)
, mCallback(nullptr)
, mCallbackData(nullptr)
, mSharedFrameMetricsHelper(aHelper)
{
}
bool
ClientTiledLayerBuffer::HasFormatChanged() const
{
SurfaceMode mode;
gfxContentType content = GetContentType(&mode);
return content != mLastPaintContentType ||
mode != mLastPaintSurfaceMode;
}
gfxContentType
ClientTiledLayerBuffer::GetContentType(SurfaceMode* aMode) const
{
gfxContentType content =
mPaintedLayer->CanUseOpaqueSurface() ? gfxContentType::COLOR :
gfxContentType::COLOR_ALPHA;
SurfaceMode mode = mPaintedLayer->GetSurfaceMode();
if (mode == SurfaceMode::SURFACE_COMPONENT_ALPHA) {
#if defined(MOZ_GFX_OPTIMIZE_MOBILE) || defined(MOZ_WIDGET_GONK)
mode = SurfaceMode::SURFACE_SINGLE_CHANNEL_ALPHA;
#else
if (!mPaintedLayer->GetParent() ||
!mPaintedLayer->GetParent()->SupportsComponentAlphaChildren()) {
mode = SurfaceMode::SURFACE_SINGLE_CHANNEL_ALPHA;
} else {
content = gfxContentType::COLOR;
}
#endif
} else if (mode == SurfaceMode::SURFACE_OPAQUE) {
#if defined(MOZ_GFX_OPTIMIZE_MOBILE) || defined(MOZ_WIDGET_GONK)
if (IsLowPrecision()) {
// If we're in low-res mode, drawing can sample from outside the visible
// region. Make sure that we only sample transparency if that happens.
mode = SurfaceMode::SURFACE_SINGLE_CHANNEL_ALPHA;
content = gfxContentType::COLOR_ALPHA;
}
#else
if (mPaintedLayer->MayResample()) {
mode = SurfaceMode::SURFACE_SINGLE_CHANNEL_ALPHA;
content = gfxContentType::COLOR_ALPHA;
}
#endif
}
if (aMode) {
*aMode = mode;
}
return content;
}
class TileExpiry final : public nsExpirationTracker<TileClient, 3>
{
public:
TileExpiry() : nsExpirationTracker<TileClient, 3>(1000, "TileExpiry") {}
static void AddTile(TileClient* aTile)
{
if (!sTileExpiry) {
sTileExpiry = MakeUnique<TileExpiry>();
}
sTileExpiry->AddObject(aTile);
}
static void RemoveTile(TileClient* aTile)
{
MOZ_ASSERT(sTileExpiry);
sTileExpiry->RemoveObject(aTile);
}
static void Shutdown() {
sTileExpiry = nullptr;
}
private:
virtual void NotifyExpired(TileClient* aTile) override
{
aTile->DiscardBackBuffer();
}
static UniquePtr<TileExpiry> sTileExpiry;
};
UniquePtr<TileExpiry> TileExpiry::sTileExpiry;
void ShutdownTileCache()
{
TileExpiry::Shutdown();
}
void
TileClient::PrivateProtector::Set(TileClient * const aContainer, RefPtr<TextureClient> aNewValue)
{
if (mBuffer) {
TileExpiry::RemoveTile(aContainer);
}
mBuffer = aNewValue;
if (mBuffer) {
TileExpiry::AddTile(aContainer);
}
}
void
TileClient::PrivateProtector::Set(TileClient * const aContainer, TextureClient* aNewValue)
{
Set(aContainer, RefPtr<TextureClient>(aNewValue));
}
// Placeholder
TileClient::TileClient()
: mCompositableClient(nullptr), mWasPlaceholder(false)
{
}
TileClient::~TileClient()
{
if (mExpirationState.IsTracked()) {
MOZ_ASSERT(mBackBuffer);
TileExpiry::RemoveTile(this);
}
}
TileClient::TileClient(const TileClient& o)
{
mBackBuffer.Set(this, o.mBackBuffer);
mBackBufferOnWhite = o.mBackBufferOnWhite;
mFrontBuffer = o.mFrontBuffer;
mFrontBufferOnWhite = o.mFrontBufferOnWhite;
mCompositableClient = o.mCompositableClient;
mWasPlaceholder = o.mWasPlaceholder;
mUpdateRect = o.mUpdateRect;
#ifdef GFX_TILEDLAYER_DEBUG_OVERLAY
mLastUpdate = o.mLastUpdate;
#endif
mManager = o.mManager;
mAllocator = o.mAllocator;
mInvalidFront = o.mInvalidFront;
mInvalidBack = o.mInvalidBack;
}
TileClient&
TileClient::operator=(const TileClient& o)
{
if (this == &o) return *this;
mBackBuffer.Set(this, o.mBackBuffer);
mBackBufferOnWhite = o.mBackBufferOnWhite;
mFrontBuffer = o.mFrontBuffer;
mFrontBufferOnWhite = o.mFrontBufferOnWhite;
mCompositableClient = o.mCompositableClient;
mWasPlaceholder = o.mWasPlaceholder;
mUpdateRect = o.mUpdateRect;
#ifdef GFX_TILEDLAYER_DEBUG_OVERLAY
mLastUpdate = o.mLastUpdate;
#endif
mManager = o.mManager;
mAllocator = o.mAllocator;
mInvalidFront = o.mInvalidFront;
mInvalidBack = o.mInvalidBack;
return *this;
}
void
TileClient::Dump(std::stringstream& aStream)
{
aStream << "TileClient(bb=" << (TextureClient*)mBackBuffer << " fb=" << mFrontBuffer.get();
if (mBackBufferOnWhite) {
aStream << " bbow=" << mBackBufferOnWhite.get();
}
if (mFrontBufferOnWhite) {
aStream << " fbow=" << mFrontBufferOnWhite.get();
}
aStream << ")";
}
void
TileClient::Flip()
{
RefPtr<TextureClient> frontBuffer = mFrontBuffer;
RefPtr<TextureClient> frontBufferOnWhite = mFrontBufferOnWhite;
mFrontBuffer = mBackBuffer;
mFrontBufferOnWhite = mBackBufferOnWhite;
mBackBuffer.Set(this, frontBuffer);
mBackBufferOnWhite = frontBufferOnWhite;
nsIntRegion invalidFront = mInvalidFront;
mInvalidFront = mInvalidBack;
mInvalidBack = invalidFront;
}
static bool
CopyFrontToBack(TextureClient* aFront,
TextureClient* aBack,
const gfx::IntRect& aRectToCopy)
{
TextureClientAutoLock frontLock(aFront, OpenMode::OPEN_READ);
if (!frontLock.Succeeded()) {
gfxCriticalError() << "[Tiling:Client] Failed to lock the tile's front buffer";
return false;
}
if (!aBack->Lock(OpenMode::OPEN_READ_WRITE)) {
gfxCriticalError() << "[Tiling:Client] Failed to lock the tile's back buffer";
return false;
}
gfx::IntPoint rectToCopyTopLeft = aRectToCopy.TopLeft();
aFront->CopyToTextureClient(aBack, &aRectToCopy, &rectToCopyTopLeft);
return true;
}
void
TileClient::ValidateBackBufferFromFront(const nsIntRegion& aDirtyRegion,
nsIntRegion& aAddPaintedRegion)
{
if (mBackBuffer && mFrontBuffer) {
gfx::IntSize tileSize = mFrontBuffer->GetSize();
const IntRect tileRect = IntRect(0, 0, tileSize.width, tileSize.height);
if (aDirtyRegion.Contains(tileRect)) {
// The dirty region means that we no longer need the front buffer, so
// discard it.
DiscardFrontBuffer();
} else {
// Region that needs copying.
nsIntRegion regionToCopy = mInvalidBack;
regionToCopy.Sub(regionToCopy, aDirtyRegion);
aAddPaintedRegion = regionToCopy;
if (regionToCopy.IsEmpty()) {
// Just redraw it all.
return;
}
// Copy the bounding rect of regionToCopy. As tiles are quite small, it
// is unlikely that we'd save much by copying each individual rect of the
// region, but we can reevaluate this if it becomes an issue.
const IntRect rectToCopy = regionToCopy.GetBounds();
gfx::IntRect gfxRectToCopy(rectToCopy.x, rectToCopy.y, rectToCopy.width, rectToCopy.height);
CopyFrontToBack(mFrontBuffer, mBackBuffer, gfxRectToCopy);
if (mBackBufferOnWhite) {
MOZ_ASSERT(mFrontBufferOnWhite);
CopyFrontToBack(mFrontBufferOnWhite, mBackBufferOnWhite, gfxRectToCopy);
}
mInvalidBack.SetEmpty();
}
}
}
void
TileClient::DiscardFrontBuffer()
{
if (mFrontBuffer) {
MOZ_ASSERT(mFrontBuffer->GetReadLock());
mAllocator->ReturnTextureClientDeferred(mFrontBuffer);
if (mFrontBufferOnWhite) {
mAllocator->ReturnTextureClientDeferred(mFrontBufferOnWhite);
}
if (mFrontBuffer->IsLocked()) {
mFrontBuffer->Unlock();
}
if (mFrontBufferOnWhite && mFrontBufferOnWhite->IsLocked()) {
mFrontBufferOnWhite->Unlock();
}
mFrontBuffer = nullptr;
mFrontBufferOnWhite = nullptr;
}
}
static void
DiscardTexture(TextureClient* aTexture, TextureClientAllocator* aAllocator)
{
if (aTexture) {
MOZ_ASSERT(aTexture->GetReadLock());
if (!aTexture->HasSynchronization() && aTexture->IsReadLocked()) {
// Our current back-buffer is still locked by the compositor. This can occur
// when the client is producing faster than the compositor can consume. In
// this case we just want to drop it and not return it to the pool.
aAllocator->ReportClientLost();
} else {
aAllocator->ReturnTextureClientDeferred(aTexture);
}
if (aTexture->IsLocked()) {
aTexture->Unlock();
}
}
}
void
TileClient::DiscardBackBuffer()
{
DiscardTexture(mBackBuffer, mAllocator);
mBackBuffer.Set(this, nullptr);
DiscardTexture(mBackBufferOnWhite, mAllocator);
mBackBufferOnWhite = nullptr;
}
static already_AddRefed<TextureClient>
CreateBackBufferTexture(TextureClient* aCurrentTexture,
CompositableClient* aCompositable,
TextureClientAllocator* aAllocator)
{
if (aCurrentTexture) {
// Our current back-buffer is still locked by the compositor. This can occur
// when the client is producing faster than the compositor can consume. In
// this case we just want to drop it and not return it to the pool.
aAllocator->ReportClientLost();
}
RefPtr<TextureClient> texture = aAllocator->GetTextureClient();
if (!texture) {
gfxCriticalError() << "[Tiling:Client] Failed to allocate a TextureClient";
return nullptr;
}
texture->EnableReadLock();
if (!aCompositable->AddTextureClient(texture)) {
gfxCriticalError() << "[Tiling:Client] Failed to connect a TextureClient";
return nullptr;
}
return texture.forget();
}
TextureClient*
TileClient::GetBackBuffer(const nsIntRegion& aDirtyRegion,
gfxContentType aContent,
SurfaceMode aMode,
nsIntRegion& aAddPaintedRegion,
RefPtr<TextureClient>* aBackBufferOnWhite)
{
if (aMode != SurfaceMode::SURFACE_COMPONENT_ALPHA) {
// It can happen that a component-alpha layer stops being on component alpha
// on the next frame, just drop the buffers on white if that happens.
if (mBackBufferOnWhite) {
mAllocator->ReportClientLost();
mBackBufferOnWhite = nullptr;
}
if (mFrontBufferOnWhite) {
mAllocator->ReportClientLost();
mFrontBufferOnWhite = nullptr;
}
}
// Try to re-use the front-buffer if possible
if (mFrontBuffer &&
mFrontBuffer->HasIntermediateBuffer() &&
!mFrontBuffer->IsReadLocked() &&
(aMode != SurfaceMode::SURFACE_COMPONENT_ALPHA || (
mFrontBufferOnWhite && !mFrontBufferOnWhite->IsReadLocked()))) {
// If we had a backbuffer we no longer care about it since we'll
// re-use the front buffer.
DiscardBackBuffer();
Flip();
} else {
if (!mBackBuffer || mBackBuffer->IsReadLocked()) {
mBackBuffer.Set(this,
CreateBackBufferTexture(mBackBuffer, mCompositableClient, mAllocator)
);
if (!mBackBuffer) {
DiscardBackBuffer();
DiscardFrontBuffer();
return nullptr;
}
mInvalidBack = IntRect(IntPoint(), mBackBuffer->GetSize());
}
if (aMode == SurfaceMode::SURFACE_COMPONENT_ALPHA
&& (!mBackBufferOnWhite || mBackBufferOnWhite->IsReadLocked())) {
mBackBufferOnWhite = CreateBackBufferTexture(
mBackBufferOnWhite, mCompositableClient, mAllocator
);
if (!mBackBufferOnWhite) {
DiscardBackBuffer();
DiscardFrontBuffer();
return nullptr;
}
mInvalidBack = IntRect(IntPoint(), mBackBufferOnWhite->GetSize());
}
ValidateBackBufferFromFront(aDirtyRegion, aAddPaintedRegion);
}
if (!mBackBuffer->IsLocked()) {
if (!mBackBuffer->Lock(OpenMode::OPEN_READ_WRITE)) {
gfxCriticalError() << "[Tiling:Client] Failed to lock a tile (B)";
DiscardBackBuffer();
DiscardFrontBuffer();
return nullptr;
}
}
if (mBackBufferOnWhite && !mBackBufferOnWhite->IsLocked()) {
if (!mBackBufferOnWhite->Lock(OpenMode::OPEN_READ_WRITE)) {
gfxCriticalError() << "[Tiling:Client] Failed to lock a tile (W)";
DiscardBackBuffer();
DiscardFrontBuffer();
return nullptr;
}
}
*aBackBufferOnWhite = mBackBufferOnWhite;
return mBackBuffer;
}
TileDescriptor
TileClient::GetTileDescriptor()
{
if (IsPlaceholderTile()) {
mWasPlaceholder = true;
return PlaceholderTileDescriptor();
}
bool wasPlaceholder = mWasPlaceholder;
mWasPlaceholder = false;
ReadLockDescriptor lock;
mFrontBuffer->SerializeReadLock(lock);
ReadLockDescriptor lockOnWhite = null_t();
if (mFrontBufferOnWhite) {
mFrontBufferOnWhite->SerializeReadLock(lockOnWhite);
}
return TexturedTileDescriptor(nullptr, mFrontBuffer->GetIPDLActor(),
mFrontBufferOnWhite ? MaybeTexture(mFrontBufferOnWhite->GetIPDLActor()) : MaybeTexture(null_t()),
mUpdateRect,
lock, lockOnWhite,
wasPlaceholder);
}
void
ClientMultiTiledLayerBuffer::DiscardBuffers()
{
for (TileClient& tile : mRetainedTiles) {
tile.DiscardBuffers();
}
}
SurfaceDescriptorTiles
ClientMultiTiledLayerBuffer::GetSurfaceDescriptorTiles()
{
InfallibleTArray<TileDescriptor> tiles;
for (TileClient& tile : mRetainedTiles) {
TileDescriptor tileDesc = tile.GetTileDescriptor();
tiles.AppendElement(tileDesc);
// Reset the update rect
tile.mUpdateRect = IntRect();
}
return SurfaceDescriptorTiles(mValidRegion,
tiles,
mTileOrigin, mTileSize,
mTiles.mFirst.x, mTiles.mFirst.y,
mTiles.mSize.width, mTiles.mSize.height,
mResolution, mFrameResolution.xScale,
mFrameResolution.yScale,
mWasLastPaintProgressive);
}
void
ClientMultiTiledLayerBuffer::PaintThebes(const nsIntRegion& aNewValidRegion,
const nsIntRegion& aPaintRegion,
const nsIntRegion& aDirtyRegion,
LayerManager::DrawPaintedLayerCallback aCallback,
void* aCallbackData,
bool aIsProgressive)
{
TILING_LOG("TILING %p: PaintThebes painting region %s\n", mPaintedLayer, Stringify(aPaintRegion).c_str());
TILING_LOG("TILING %p: PaintThebes new valid region %s\n", mPaintedLayer, Stringify(aNewValidRegion).c_str());
mCallback = aCallback;
mCallbackData = aCallbackData;
mWasLastPaintProgressive = aIsProgressive;
#ifdef GFX_TILEDLAYER_PREF_WARNINGS
long start = PR_IntervalNow();
#endif
#ifdef GFX_TILEDLAYER_PREF_WARNINGS
if (PR_IntervalNow() - start > 30) {
const IntRect bounds = aPaintRegion.GetBounds();
printf_stderr("Time to draw %i: %i, %i, %i, %i\n", PR_IntervalNow() - start, bounds.x, bounds.y, bounds.width, bounds.height);
if (aPaintRegion.IsComplex()) {
printf_stderr("Complex region\n");
for (auto iter = aPaintRegion.RectIter(); !iter.Done(); iter.Next()) {
const IntRect& rect = iter.Get();
printf_stderr(" rect %i, %i, %i, %i\n",
rect.x, rect.y, rect.width, rect.height);
}
}
}
start = PR_IntervalNow();
#endif
PROFILER_LABEL("ClientMultiTiledLayerBuffer", "PaintThebesUpdate",
js::ProfileEntry::Category::GRAPHICS);
mNewValidRegion = aNewValidRegion;
Update(aNewValidRegion, aPaintRegion, aDirtyRegion);
#ifdef GFX_TILEDLAYER_PREF_WARNINGS
if (PR_IntervalNow() - start > 10) {
const IntRect bounds = aPaintRegion.GetBounds();
printf_stderr("Time to tile %i: %i, %i, %i, %i\n", PR_IntervalNow() - start, bounds.x, bounds.y, bounds.width, bounds.height);
}
#endif
mLastPaintContentType = GetContentType(&mLastPaintSurfaceMode);
mCallback = nullptr;
mCallbackData = nullptr;
}
void PadDrawTargetOutFromRegion(RefPtr<DrawTarget> drawTarget, nsIntRegion &region)
{
struct LockedBits {
uint8_t *data;
IntSize size;
int32_t stride;
SurfaceFormat format;
static int clamp(int x, int min, int max)
{
if (x < min)
x = min;
if (x > max)
x = max;
return x;
}
static void ensure_memcpy(uint8_t *dst, uint8_t *src, size_t n, uint8_t *bitmap, int stride, int height)
{
if (src + n > bitmap + stride*height) {
MOZ_CRASH("GFX: long src memcpy");
}
if (src < bitmap) {
MOZ_CRASH("GFX: short src memcpy");
}
if (dst + n > bitmap + stride*height) {
MOZ_CRASH("GFX: long dst mempcy");
}
if (dst < bitmap) {
MOZ_CRASH("GFX: short dst mempcy");
}
}
static void visitor(void *closure, VisitSide side, int x1, int y1, int x2, int y2) {
LockedBits *lb = static_cast<LockedBits*>(closure);
uint8_t *bitmap = lb->data;
const int bpp = gfx::BytesPerPixel(lb->format);
const int stride = lb->stride;
const int width = lb->size.width;
const int height = lb->size.height;
if (side == VisitSide::TOP) {
if (y1 > 0) {
x1 = clamp(x1, 0, width - 1);
x2 = clamp(x2, 0, width - 1);
ensure_memcpy(&bitmap[x1*bpp + (y1-1) * stride], &bitmap[x1*bpp + y1 * stride], (x2 - x1) * bpp, bitmap, stride, height);
memcpy(&bitmap[x1*bpp + (y1-1) * stride], &bitmap[x1*bpp + y1 * stride], (x2 - x1) * bpp);
}
} else if (side == VisitSide::BOTTOM) {
if (y1 < height) {
x1 = clamp(x1, 0, width - 1);
x2 = clamp(x2, 0, width - 1);
ensure_memcpy(&bitmap[x1*bpp + y1 * stride], &bitmap[x1*bpp + (y1-1) * stride], (x2 - x1) * bpp, bitmap, stride, height);
memcpy(&bitmap[x1*bpp + y1 * stride], &bitmap[x1*bpp + (y1-1) * stride], (x2 - x1) * bpp);
}
} else if (side == VisitSide::LEFT) {
if (x1 > 0) {
while (y1 != y2) {
memcpy(&bitmap[(x1-1)*bpp + y1 * stride], &bitmap[x1*bpp + y1*stride], bpp);
y1++;
}
}
} else if (side == VisitSide::RIGHT) {
if (x1 < width) {
while (y1 != y2) {
memcpy(&bitmap[x1*bpp + y1 * stride], &bitmap[(x1-1)*bpp + y1*stride], bpp);
y1++;
}
}
}
}
} lb;
if (drawTarget->LockBits(&lb.data, &lb.size, &lb.stride, &lb.format)) {
// we can only pad software targets so if we can't lock the bits don't pad
region.VisitEdges(lb.visitor, &lb);
drawTarget->ReleaseBits(lb.data);
}
}
void
ClientTiledLayerBuffer::UnlockTile(TileClient& aTile)
{
// We locked the back buffer, and flipped so we now need to unlock the front
if (aTile.mFrontBuffer && aTile.mFrontBuffer->IsLocked()) {
aTile.mFrontBuffer->Unlock();
aTile.mFrontBuffer->SyncWithObject(mCompositableClient->GetForwarder()->GetSyncObject());
}
if (aTile.mFrontBufferOnWhite && aTile.mFrontBufferOnWhite->IsLocked()) {
aTile.mFrontBufferOnWhite->Unlock();
aTile.mFrontBufferOnWhite->SyncWithObject(mCompositableClient->GetForwarder()->GetSyncObject());
}
if (aTile.mBackBuffer && aTile.mBackBuffer->IsLocked()) {
aTile.mBackBuffer->Unlock();
}
if (aTile.mBackBufferOnWhite && aTile.mBackBufferOnWhite->IsLocked()) {
aTile.mBackBufferOnWhite->Unlock();
}
}
void ClientMultiTiledLayerBuffer::Update(const nsIntRegion& newValidRegion,
const nsIntRegion& aPaintRegion,
const nsIntRegion& aDirtyRegion)
{
const IntSize scaledTileSize = GetScaledTileSize();
const gfx::IntRect newBounds = newValidRegion.GetBounds();
const TilesPlacement oldTiles = mTiles;
const TilesPlacement newTiles(floor_div(newBounds.x, scaledTileSize.width),
floor_div(newBounds.y, scaledTileSize.height),
floor_div(GetTileStart(newBounds.x, scaledTileSize.width)
+ newBounds.width, scaledTileSize.width) + 1,
floor_div(GetTileStart(newBounds.y, scaledTileSize.height)
+ newBounds.height, scaledTileSize.height) + 1);
const size_t oldTileCount = mRetainedTiles.Length();
const size_t newTileCount = newTiles.mSize.width * newTiles.mSize.height;
nsTArray<TileClient> oldRetainedTiles;
mRetainedTiles.SwapElements(oldRetainedTiles);
mRetainedTiles.SetLength(newTileCount);
for (size_t oldIndex = 0; oldIndex < oldTileCount; oldIndex++) {
const TileIntPoint tilePosition = oldTiles.TilePosition(oldIndex);
const size_t newIndex = newTiles.TileIndex(tilePosition);
// First, get the already existing tiles to the right place in the new array.
// Leave placeholders (default constructor) where there was no tile.
if (newTiles.HasTile(tilePosition)) {
mRetainedTiles[newIndex] = oldRetainedTiles[oldIndex];
} else {
// release tiles that we are not going to reuse before allocating new ones
// to avoid allocating unnecessarily.
oldRetainedTiles[oldIndex].DiscardBuffers();
}
}
oldRetainedTiles.Clear();
if (!aPaintRegion.IsEmpty()) {
for (size_t i = 0; i < newTileCount; ++i) {
const TileIntPoint tilePosition = newTiles.TilePosition(i);
IntPoint tileOffset = GetTileOffset(tilePosition);
nsIntRegion tileDrawRegion = IntRect(tileOffset, scaledTileSize);
tileDrawRegion.AndWith(aPaintRegion);
if (tileDrawRegion.IsEmpty()) {
continue;
}
TileClient& tile = mRetainedTiles[i];
if (!ValidateTile(tile, GetTileOffset(tilePosition), tileDrawRegion)) {
gfxCriticalError() << "ValidateTile failed";
}
}
if (mMoz2DTiles.size() > 0) {
gfx::TileSet tileset;
for (size_t i = 0; i < mMoz2DTiles.size(); ++i) {
mMoz2DTiles[i].mTileOrigin -= mTilingOrigin;
}
tileset.mTiles = &mMoz2DTiles[0];
tileset.mTileCount = mMoz2DTiles.size();
RefPtr<DrawTarget> drawTarget = gfx::Factory::CreateTiledDrawTarget(tileset);
if (!drawTarget || !drawTarget->IsValid()) {
gfxDevCrash(LogReason::InvalidContext) << "Invalid tiled draw target";
return;
}
drawTarget->SetTransform(Matrix());
RefPtr<gfxContext> ctx = gfxContext::CreateOrNull(drawTarget);
MOZ_ASSERT(ctx); // already checked the draw target above
ctx->SetMatrix(
ctx->CurrentMatrix().Scale(mResolution, mResolution).Translate(ThebesPoint(-mTilingOrigin)));
mCallback(mPaintedLayer, ctx, aPaintRegion, aDirtyRegion,
DrawRegionClip::DRAW, nsIntRegion(), mCallbackData);
mMoz2DTiles.clear();
// Reset:
mTilingOrigin = IntPoint(std::numeric_limits<int32_t>::max(),
std::numeric_limits<int32_t>::max());
}
bool edgePaddingEnabled = gfxPrefs::TileEdgePaddingEnabled();
for (uint32_t i = 0; i < mRetainedTiles.Length(); ++i) {
TileClient& tile = mRetainedTiles[i];
// Only worry about padding when not doing low-res because it simplifies
// the math and the artifacts won't be noticable
// Edge padding prevents sampling artifacts when compositing.
if (edgePaddingEnabled && mResolution == 1 &&
tile.mFrontBuffer && tile.mFrontBuffer->IsLocked()) {
const TileIntPoint tilePosition = newTiles.TilePosition(i);
IntPoint tileOffset = GetTileOffset(tilePosition);
// Strictly speakig we want the unscaled rect here, but it doesn't matter
// because we only run this code when the resolution is equal to 1.
IntRect tileRect = IntRect(tileOffset.x, tileOffset.y,
GetTileSize().width, GetTileSize().height);
nsIntRegion tileDrawRegion = IntRect(tileOffset, scaledTileSize);
tileDrawRegion.AndWith(aPaintRegion);
nsIntRegion tileValidRegion = mValidRegion;
tileValidRegion.OrWith(tileDrawRegion);
// We only need to pad out if the tile has area that's not valid
if (!tileValidRegion.Contains(tileRect)) {
tileValidRegion = tileValidRegion.Intersect(tileRect);
// translate the region into tile space and pad
tileValidRegion.MoveBy(-IntPoint(tileOffset.x, tileOffset.y));
RefPtr<DrawTarget> drawTarget = tile.mFrontBuffer->BorrowDrawTarget();
PadDrawTargetOutFromRegion(drawTarget, tileValidRegion);
}
}
UnlockTile(tile);
}
}
mTiles = newTiles;
mValidRegion = newValidRegion;
mPaintedRegion.OrWith(aPaintRegion);
}
bool
ClientMultiTiledLayerBuffer::ValidateTile(TileClient& aTile,
const nsIntPoint& aTileOrigin,
const nsIntRegion& aDirtyRegion)
{
PROFILER_LABEL("ClientMultiTiledLayerBuffer", "ValidateTile",
js::ProfileEntry::Category::GRAPHICS);
#ifdef GFX_TILEDLAYER_PREF_WARNINGS
if (aDirtyRegion.IsComplex()) {
printf_stderr("Complex region\n");
}
#endif
SurfaceMode mode;
gfxContentType content = GetContentType(&mode);
if (aTile.IsPlaceholderTile()) {
aTile.SetLayerManager(mManager);
aTile.SetTextureAllocator(mManager->GetCompositorBridgeChild()->GetTexturePool(
mManager->GetCompositorBackendType(),
gfxPlatform::GetPlatform()->Optimal2DFormatForContent(content),
TextureFlags::DISALLOW_BIGIMAGE | TextureFlags::IMMEDIATE_UPLOAD));
}
aTile.SetCompositableClient(mCompositableClient);
nsIntRegion offsetScaledDirtyRegion = aDirtyRegion.MovedBy(-aTileOrigin);
offsetScaledDirtyRegion.ScaleRoundOut(mResolution, mResolution);
nsIntRegion extraPainted;
RefPtr<TextureClient> backBufferOnWhite;
RefPtr<TextureClient> backBuffer =
aTile.GetBackBuffer(offsetScaledDirtyRegion,
content, mode,
extraPainted,
&backBufferOnWhite);
aTile.mUpdateRect = offsetScaledDirtyRegion.GetBounds().Union(extraPainted.GetBounds());
extraPainted.MoveBy(aTileOrigin);
extraPainted.And(extraPainted, mNewValidRegion);
mPaintedRegion.Or(mPaintedRegion, extraPainted);
if (!backBuffer) {
return false;
}
gfx::Tile moz2DTile;
RefPtr<DrawTarget> dt = backBuffer->BorrowDrawTarget();
RefPtr<DrawTarget> dtOnWhite;
if (backBufferOnWhite) {
dtOnWhite = backBufferOnWhite->BorrowDrawTarget();
moz2DTile.mDrawTarget = Factory::CreateDualDrawTarget(dt, dtOnWhite);
} else {
moz2DTile.mDrawTarget = dt;
}
moz2DTile.mTileOrigin = gfx::IntPoint(aTileOrigin.x, aTileOrigin.y);
if (!dt || (backBufferOnWhite && !dtOnWhite)) {
aTile.DiscardBuffers();
return false;
}
mMoz2DTiles.push_back(moz2DTile);
mTilingOrigin.x = std::min(mTilingOrigin.x, moz2DTile.mTileOrigin.x);
mTilingOrigin.y = std::min(mTilingOrigin.y, moz2DTile.mTileOrigin.y);
for (auto iter = aDirtyRegion.RectIter(); !iter.Done(); iter.Next()) {
const IntRect& dirtyRect = iter.Get();
gfx::Rect drawRect(dirtyRect.x - aTileOrigin.x,
dirtyRect.y - aTileOrigin.y,
dirtyRect.width,
dirtyRect.height);
drawRect.Scale(mResolution);
// Mark the newly updated area as invalid in the front buffer
aTile.mInvalidFront.Or(aTile.mInvalidFront,
IntRect(NS_lroundf(drawRect.x), NS_lroundf(drawRect.y),
drawRect.width, drawRect.height));
if (mode == SurfaceMode::SURFACE_COMPONENT_ALPHA) {
dt->FillRect(drawRect, ColorPattern(Color(0.0, 0.0, 0.0, 1.0)));
dtOnWhite->FillRect(drawRect, ColorPattern(Color(1.0, 1.0, 1.0, 1.0)));
} else if (content == gfxContentType::COLOR_ALPHA) {
dt->ClearRect(drawRect);
}
}
// The new buffer is now validated, remove the dirty region from it.
aTile.mInvalidBack.SubOut(offsetScaledDirtyRegion);
aTile.Flip();
return true;
}
/**
* This function takes the transform stored in aTransformToCompBounds
* (which was generated in GetTransformToAncestorsParentLayer), and
* modifies it with the ViewTransform from the compositor side so that
* it reflects what the compositor is actually rendering. This operation
* basically adds in the layer's async transform.
* This function then returns the scroll ancestor's composition bounds,
* transformed into the painted layer's LayerPixel coordinates, accounting
* for the compositor state.
*/
static Maybe<LayerRect>
GetCompositorSideCompositionBounds(const LayerMetricsWrapper& aScrollAncestor,
const LayerToParentLayerMatrix4x4& aTransformToCompBounds,
const AsyncTransform& aAPZTransform,
const LayerRect& aClip)
{
LayerToParentLayerMatrix4x4 transform = aTransformToCompBounds *
AsyncTransformComponentMatrix(aAPZTransform);
return UntransformBy(transform.Inverse(),
aScrollAncestor.Metrics().GetCompositionBounds(), aClip);
}
bool
ClientMultiTiledLayerBuffer::ComputeProgressiveUpdateRegion(const nsIntRegion& aInvalidRegion,
const nsIntRegion& aOldValidRegion,
nsIntRegion& aRegionToPaint,
BasicTiledLayerPaintData* aPaintData,
bool aIsRepeated)
{
aRegionToPaint = aInvalidRegion;
// If the composition bounds rect is empty, we can't make any sensible
// decision about how to update coherently. In this case, just update
// everything in one transaction.
if (aPaintData->mCompositionBounds.IsEmpty()) {
aPaintData->mPaintFinished = true;
return false;
}
// If this is a low precision buffer, we force progressive updates. The
// assumption is that the contents is less important, so visual coherency
// is lower priority than speed.
bool drawingLowPrecision = IsLowPrecision();
// Find out if we have any non-stale content to update.
nsIntRegion staleRegion;
staleRegion.And(aInvalidRegion, aOldValidRegion);
TILING_LOG("TILING %p: Progressive update stale region %s\n", mPaintedLayer, Stringify(staleRegion).c_str());
LayerMetricsWrapper scrollAncestor;
mPaintedLayer->GetAncestorLayers(&scrollAncestor, nullptr, nullptr);
// Find out the current view transform to determine which tiles to draw
// first, and see if we should just abort this paint. Aborting is usually
// caused by there being an incoming, more relevant paint.
AsyncTransform viewTransform;
#if defined(MOZ_WIDGET_ANDROID) && !defined(MOZ_ANDROID_APZ)
FrameMetrics contentMetrics = scrollAncestor.Metrics();
bool abortPaint = false;
// On Android, only the primary scrollable layer is async-scrolled, and the only one
// that the Java-side code can provide details about. If we're tiling some other layer
// then we already have all the information we need about it.
if (contentMetrics.GetScrollId() == mManager->GetRootScrollableLayerId()) {
FrameMetrics compositorMetrics = contentMetrics;
// The ProgressiveUpdateCallback updates the compositorMetrics
abortPaint = mManager->ProgressiveUpdateCallback(!staleRegion.Contains(aInvalidRegion),
compositorMetrics,
!drawingLowPrecision);
viewTransform = ComputeViewTransform(contentMetrics, compositorMetrics);
}
#else
MOZ_ASSERT(mSharedFrameMetricsHelper);
bool abortPaint =
mSharedFrameMetricsHelper->UpdateFromCompositorFrameMetrics(
scrollAncestor,
!staleRegion.Contains(aInvalidRegion),
drawingLowPrecision,
viewTransform);
#endif
TILING_LOG("TILING %p: Progressive update view transform %s zoom %f abort %d\n",
mPaintedLayer, ToString(viewTransform.mTranslation).c_str(), viewTransform.mScale.scale, abortPaint);
if (abortPaint) {
// We ignore if front-end wants to abort if this is the first,
// non-low-precision paint, as in that situation, we're about to override
// front-end's page/viewport metrics.
if (!aPaintData->mFirstPaint || drawingLowPrecision) {
PROFILER_LABEL("ClientMultiTiledLayerBuffer", "ComputeProgressiveUpdateRegion",
js::ProfileEntry::Category::GRAPHICS);
aRegionToPaint.SetEmpty();
return aIsRepeated;
}
}
Maybe<LayerRect> transformedCompositionBounds =
GetCompositorSideCompositionBounds(scrollAncestor,
aPaintData->mTransformToCompBounds,
viewTransform,
ViewAs<LayerPixel>(Rect(mPaintedLayer->GetLayerBounds())));
if (!transformedCompositionBounds) {
aPaintData->mPaintFinished = true;
return false;
}
TILING_LOG("TILING %p: Progressive update transformed compositor bounds %s\n", mPaintedLayer, Stringify(*transformedCompositionBounds).c_str());
// Compute a "coherent update rect" that we should paint all at once in a
// single transaction. This is to avoid rendering glitches on animated
// page content, and when layers change size/shape.
// On Fennec uploads are more expensive because we're not using gralloc, so
// we use a coherent update rect that is intersected with the screen at the
// time of issuing the draw command. This will paint faster but also potentially
// make the progressive paint more visible to the user while scrolling.
// On B2G uploads are cheaper and we value coherency more, especially outside
// the browser, so we always use the entire user-visible area.
IntRect coherentUpdateRect(RoundedOut(
#ifdef MOZ_WIDGET_ANDROID
transformedCompositionBounds->Intersect(aPaintData->mCompositionBounds)
#else
*transformedCompositionBounds
#endif
).ToUnknownRect());
TILING_LOG("TILING %p: Progressive update final coherency rect %s\n", mPaintedLayer, Stringify(coherentUpdateRect).c_str());
aRegionToPaint.And(aInvalidRegion, coherentUpdateRect);
aRegionToPaint.Or(aRegionToPaint, staleRegion);
bool drawingStale = !aRegionToPaint.IsEmpty();
if (!drawingStale) {
aRegionToPaint = aInvalidRegion;
}
// Prioritise tiles that are currently visible on the screen.
bool paintingVisible = false;
if (aRegionToPaint.Intersects(coherentUpdateRect)) {
aRegionToPaint.And(aRegionToPaint, coherentUpdateRect);
paintingVisible = true;
}
TILING_LOG("TILING %p: Progressive update final paint region %s\n", mPaintedLayer, Stringify(aRegionToPaint).c_str());
// Paint area that's visible and overlaps previously valid content to avoid
// visible glitches in animated elements, such as gifs.
bool paintInSingleTransaction = paintingVisible && (drawingStale || aPaintData->mFirstPaint);
TILING_LOG("TILING %p: paintingVisible %d drawingStale %d firstPaint %d singleTransaction %d\n",
mPaintedLayer, paintingVisible, drawingStale, aPaintData->mFirstPaint, paintInSingleTransaction);
// The following code decides what order to draw tiles in, based on the
// current scroll direction of the primary scrollable layer.
NS_ASSERTION(!aRegionToPaint.IsEmpty(), "Unexpectedly empty paint region!");
IntRect paintBounds = aRegionToPaint.GetBounds();
int startX, incX, startY, incY;
gfx::IntSize scaledTileSize = GetScaledTileSize();
if (aPaintData->mScrollOffset.x >= aPaintData->mLastScrollOffset.x) {
startX = RoundDownToTileEdge(paintBounds.x, scaledTileSize.width);
incX = scaledTileSize.width;
} else {
startX = RoundDownToTileEdge(paintBounds.XMost() - 1, scaledTileSize.width);
incX = -scaledTileSize.width;
}
if (aPaintData->mScrollOffset.y >= aPaintData->mLastScrollOffset.y) {
startY = RoundDownToTileEdge(paintBounds.y, scaledTileSize.height);
incY = scaledTileSize.height;
} else {
startY = RoundDownToTileEdge(paintBounds.YMost() - 1, scaledTileSize.height);
incY = -scaledTileSize.height;
}
// Find a tile to draw.
IntRect tileBounds(startX, startY, scaledTileSize.width, scaledTileSize.height);
int32_t scrollDiffX = aPaintData->mScrollOffset.x - aPaintData->mLastScrollOffset.x;
int32_t scrollDiffY = aPaintData->mScrollOffset.y - aPaintData->mLastScrollOffset.y;
// This loop will always terminate, as there is at least one tile area
// along the first/last row/column intersecting with regionToPaint, or its
// bounds would have been smaller.
while (true) {
aRegionToPaint.And(aInvalidRegion, tileBounds);
if (!aRegionToPaint.IsEmpty()) {
if (mResolution != 1) {
// Paint the entire tile for low-res. This is aimed to fixing low-res resampling
// and to avoid doing costly region accurate painting for a small area.
aRegionToPaint = tileBounds;
}
break;
}
if (Abs(scrollDiffY) >= Abs(scrollDiffX)) {
tileBounds.x += incX;
} else {
tileBounds.y += incY;
}
}
if (!aRegionToPaint.Contains(aInvalidRegion)) {
// The region needed to paint is larger then our progressive chunk size
// therefore update what we want to paint and ask for a new paint transaction.
// If we need to draw more than one tile to maintain coherency, make
// sure it happens in the same transaction by requesting this work be
// repeated immediately.
// If this is unnecessary, the remaining work will be done tile-by-tile in
// subsequent transactions. The caller code is responsible for scheduling
// the subsequent transactions as long as we don't set the mPaintFinished
// flag to true.
return (!drawingLowPrecision && paintInSingleTransaction);
}
// We're not repeating painting and we've not requested a repeat transaction,
// so the paint is finished. If there's still a separate low precision
// paint to do, it will get marked as unfinished later.
aPaintData->mPaintFinished = true;
return false;
}
bool
ClientMultiTiledLayerBuffer::ProgressiveUpdate(nsIntRegion& aValidRegion,
nsIntRegion& aInvalidRegion,
const nsIntRegion& aOldValidRegion,
BasicTiledLayerPaintData* aPaintData,
LayerManager::DrawPaintedLayerCallback aCallback,
void* aCallbackData)
{
TILING_LOG("TILING %p: Progressive update valid region %s\n", mPaintedLayer, Stringify(aValidRegion).c_str());
TILING_LOG("TILING %p: Progressive update invalid region %s\n", mPaintedLayer, Stringify(aInvalidRegion).c_str());
TILING_LOG("TILING %p: Progressive update old valid region %s\n", mPaintedLayer, Stringify(aOldValidRegion).c_str());
bool repeat = false;
bool isBufferChanged = false;
do {
// Compute the region that should be updated. Repeat as many times as
// is required.
nsIntRegion regionToPaint;
repeat = ComputeProgressiveUpdateRegion(aInvalidRegion,
aOldValidRegion,
regionToPaint,
aPaintData,
repeat);
TILING_LOG("TILING %p: Progressive update computed paint region %s repeat %d\n", mPaintedLayer, Stringify(regionToPaint).c_str(), repeat);
// There's no further work to be done.
if (regionToPaint.IsEmpty()) {
break;
}
isBufferChanged = true;
// Keep track of what we're about to refresh.
aValidRegion.Or(aValidRegion, regionToPaint);
// aValidRegion may have been altered by InvalidateRegion, but we still
// want to display stale content until it gets progressively updated.
// Create a region that includes stale content.
nsIntRegion validOrStale;
validOrStale.Or(aValidRegion, aOldValidRegion);
// Paint the computed region and subtract it from the invalid region.
PaintThebes(validOrStale, regionToPaint, aInvalidRegion,
aCallback, aCallbackData, true);
aInvalidRegion.Sub(aInvalidRegion, regionToPaint);
} while (repeat);
TILING_LOG("TILING %p: Progressive update final valid region %s buffer changed %d\n", mPaintedLayer, Stringify(aValidRegion).c_str(), isBufferChanged);
TILING_LOG("TILING %p: Progressive update final invalid region %s\n", mPaintedLayer, Stringify(aInvalidRegion).c_str());
// Return false if nothing has been drawn, or give what has been drawn
// to the shadow layer to upload.
return isBufferChanged;
}
void
TiledContentClient::PrintInfo(std::stringstream& aStream, const char* aPrefix)
{
aStream << aPrefix;
aStream << nsPrintfCString("%sTiledContentClient (0x%p)", mName, this).get();
if (profiler_feature_active("displaylistdump")) {
nsAutoCString pfx(aPrefix);
pfx += " ";
Dump(aStream, pfx.get(), false);
}
}
void
TiledContentClient::Dump(std::stringstream& aStream,
const char* aPrefix,
bool aDumpHtml,
TextureDumpMode aCompress)
{
GetTiledBuffer()->Dump(aStream, aPrefix, aDumpHtml, aCompress);
}
void
BasicTiledLayerPaintData::ResetPaintData()
{
mLowPrecisionPaintCount = 0;
mPaintFinished = false;
mHasTransformAnimation = false;
mCompositionBounds.SetEmpty();
mCriticalDisplayPort = Nothing();
}
} // namespace layers
} // namespace mozilla
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