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gecko/gfx/layers/client/TiledContentClient.cpp
Wes Kocher 02d44fddfa Backed out 11 changesets (bug 952977) for reftest-no-accel failures 
Backed out changeset ea2367c19da3 (bug 952977)
Backed out changeset c401c8748eb3 (bug 952977)
Backed out changeset a93e9ff1043b (bug 952977)
Backed out changeset 765b7f67163e (bug 952977)
Backed out changeset 3d8cf4f5777f (bug 952977)
Backed out changeset 8993710a3ab3 (bug 952977)
Backed out changeset 1298c39b745a (bug 952977)
Backed out changeset be0b899fbe5e (bug 952977)
Backed out changeset f69bea1f1feb (bug 952977)
Backed out changeset 1a745777f07e (bug 952977)
Backed out changeset 5ad1d18dfe17 (bug 952977)
2014-07-29 18:58:46 -07:00

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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 "ClientTiledThebesLayer.h" // for ClientTiledThebesLayer
#include "GeckoProfiler.h" // for PROFILER_LABEL
#include "ClientLayerManager.h" // for ClientLayerManager
#include "CompositorChild.h" // for CompositorChild
#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/ShadowLayers.h" // for ShadowLayerForwarder
#include "TextureClientPool.h"
#include "nsDebug.h" // for NS_ASSERTION
#include "nsISupportsImpl.h" // for gfxContext::AddRef, etc
#include "nsSize.h" // for nsIntSize
#include "gfxReusableSharedImageSurfaceWrapper.h"
#include "nsMathUtils.h" // for NS_roundf
#include "gfx2DGlue.h"
#include "LayersLogging.h"
#include "UnitTransforms.h" // for TransformTo
// 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(gfxRGBA(0.0, 0.0, 0.0, 1.0));
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
cairo_t* cr = c.GetCairo();
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(gfxRGBA(0.0, 0.0, 0.0, 1.0));
c.Rectangle(gfxRect(gfxPoint(2,2),gfxSize(textWidth, 30)));
c.Fill();
c.NewPath();
c.SetDeviceColor(gfxRGBA(1.0, 0.0, 0.0, 1.0));
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 {
TiledContentClient::TiledContentClient(ClientTiledThebesLayer* aThebesLayer,
ClientLayerManager* aManager)
: CompositableClient(aManager->AsShadowForwarder())
{
MOZ_COUNT_CTOR(TiledContentClient);
mTiledBuffer = ClientTiledLayerBuffer(aThebesLayer, this, aManager,
&mSharedFrameMetricsHelper);
mLowPrecisionTiledBuffer = ClientTiledLayerBuffer(aThebesLayer, this, aManager,
&mSharedFrameMetricsHelper);
mLowPrecisionTiledBuffer.SetResolution(gfxPrefs::LowPrecisionResolution());
}
void
TiledContentClient::ClearCachedResources()
{
mTiledBuffer.DiscardBuffers();
mLowPrecisionTiledBuffer.DiscardBuffers();
}
void
TiledContentClient::UseTiledLayerBuffer(TiledBufferType aType)
{
ClientTiledLayerBuffer* buffer = aType == LOW_PRECISION_TILED_BUFFER
? &mLowPrecisionTiledBuffer
: &mTiledBuffer;
// Take a ReadLock on behalf of the TiledContentHost. This
// reference will be adopted when the descriptor is opened in
// TiledLayerBufferComposite.
buffer->ReadLock();
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 ViewTransform
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.
LayerPoint translation = (aCompositorMetrics.GetScrollOffset() - aContentMetrics.GetScrollOffset())
* aContentMetrics.LayersPixelsPerCSSPixel();
return ViewTransform(-translation,
aCompositorMetrics.GetZoom()
/ aContentMetrics.mDevPixelsPerCSSPixel
/ aCompositorMetrics.GetParentResolution());
}
bool
SharedFrameMetricsHelper::UpdateFromCompositorFrameMetrics(
ContainerLayer* aLayer,
bool aHasPendingNewThebesContent,
bool aLowPrecision,
ViewTransform& aViewTransform)
{
MOZ_ASSERT(aLayer);
CompositorChild* compositor = nullptr;
if(aLayer->Manager() &&
aLayer->Manager()->AsClientLayerManager()) {
compositor = aLayer->Manager()->AsClientLayerManager()->GetCompositorChild();
}
if (!compositor) {
return false;
}
const FrameMetrics& contentMetrics = aLayer->GetFrameMetrics();
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().scale, contentMetrics.GetZoom().scale)) {
TILING_LOG("TILING: Aborting because resolution changed from %f to %f\n",
contentMetrics.GetZoom().scale, compositorMetrics.GetZoom().scale);
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.mDisplayPort.x - compositorMetrics.mDisplayPort.x) <= 2 &&
fabsf(contentMetrics.mDisplayPort.y - compositorMetrics.mDisplayPort.y) <= 2 &&
fabsf(contentMetrics.mDisplayPort.width - compositorMetrics.mDisplayPort.width) <= 2 &&
fabsf(contentMetrics.mDisplayPort.height - compositorMetrics.mDisplayPort.height)) {
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.mCriticalDisplayPort.IsEmpty()
? aContentMetrics.mDisplayPort
: aContentMetrics.mCriticalDisplayPort)
+ 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.mScrollableRect);
showing = showing.Intersect(aContentMetrics.mScrollableRect);
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;
}
ClientTiledLayerBuffer::ClientTiledLayerBuffer(ClientTiledThebesLayer* aThebesLayer,
CompositableClient* aCompositableClient,
ClientLayerManager* aManager,
SharedFrameMetricsHelper* aHelper)
: mThebesLayer(aThebesLayer)
, mCompositableClient(aCompositableClient)
, mManager(aManager)
, mLastPaintOpaque(false)
, mSharedFrameMetricsHelper(aHelper)
{
}
bool
ClientTiledLayerBuffer::HasFormatChanged() const
{
return mThebesLayer->CanUseOpaqueSurface() != mLastPaintOpaque;
}
gfxContentType
ClientTiledLayerBuffer::GetContentType() const
{
if (mThebesLayer->CanUseOpaqueSurface()) {
return gfxContentType::COLOR;
} else {
return gfxContentType::COLOR_ALPHA;
}
}
gfxMemorySharedReadLock::gfxMemorySharedReadLock()
: mReadCount(1)
{
MOZ_COUNT_CTOR(gfxMemorySharedReadLock);
}
gfxMemorySharedReadLock::~gfxMemorySharedReadLock()
{
MOZ_COUNT_DTOR(gfxMemorySharedReadLock);
}
int32_t
gfxMemorySharedReadLock::ReadLock()
{
NS_ASSERT_OWNINGTHREAD(gfxMemorySharedReadLock);
return PR_ATOMIC_INCREMENT(&mReadCount);
}
int32_t
gfxMemorySharedReadLock::ReadUnlock()
{
int32_t readCount = PR_ATOMIC_DECREMENT(&mReadCount);
NS_ASSERTION(readCount >= 0, "ReadUnlock called without ReadLock.");
return readCount;
}
int32_t
gfxMemorySharedReadLock::GetReadCount()
{
NS_ASSERT_OWNINGTHREAD(gfxMemorySharedReadLock);
return mReadCount;
}
gfxShmSharedReadLock::gfxShmSharedReadLock(ISurfaceAllocator* aAllocator)
: mAllocator(aAllocator)
, mAllocSuccess(false)
{
MOZ_COUNT_CTOR(gfxShmSharedReadLock);
MOZ_ASSERT(mAllocator);
if (mAllocator) {
#define MOZ_ALIGN_WORD(x) (((x) + 3) & ~3)
if (mAllocator->AllocShmemSection(MOZ_ALIGN_WORD(sizeof(ShmReadLockInfo)), &mShmemSection)) {
ShmReadLockInfo* info = GetShmReadLockInfoPtr();
info->readCount = 1;
mAllocSuccess = true;
}
}
}
gfxShmSharedReadLock::~gfxShmSharedReadLock()
{
MOZ_COUNT_DTOR(gfxShmSharedReadLock);
}
int32_t
gfxShmSharedReadLock::ReadLock() {
NS_ASSERT_OWNINGTHREAD(gfxShmSharedReadLock);
if (!mAllocSuccess) {
return 0;
}
ShmReadLockInfo* info = GetShmReadLockInfoPtr();
return PR_ATOMIC_INCREMENT(&info->readCount);
}
int32_t
gfxShmSharedReadLock::ReadUnlock() {
if (!mAllocSuccess) {
return 0;
}
ShmReadLockInfo* info = GetShmReadLockInfoPtr();
int32_t readCount = PR_ATOMIC_DECREMENT(&info->readCount);
NS_ASSERTION(readCount >= 0, "ReadUnlock called without a ReadLock.");
if (readCount <= 0) {
mAllocator->FreeShmemSection(mShmemSection);
}
return readCount;
}
int32_t
gfxShmSharedReadLock::GetReadCount() {
NS_ASSERT_OWNINGTHREAD(gfxShmSharedReadLock);
if (!mAllocSuccess) {
return 0;
}
ShmReadLockInfo* info = GetShmReadLockInfoPtr();
return info->readCount;
}
// Placeholder
TileClient::TileClient()
: mBackBuffer(nullptr)
, mFrontBuffer(nullptr)
, mBackLock(nullptr)
, mFrontLock(nullptr)
, mCompositableClient(nullptr)
{
}
TileClient::TileClient(const TileClient& o)
{
mBackBuffer = o.mBackBuffer;
mFrontBuffer = o.mFrontBuffer;
mBackLock = o.mBackLock;
mFrontLock = o.mFrontLock;
mCompositableClient = nullptr;
#ifdef GFX_TILEDLAYER_DEBUG_OVERLAY
mLastUpdate = o.mLastUpdate;
#endif
mManager = o.mManager;
mInvalidFront = o.mInvalidFront;
mInvalidBack = o.mInvalidBack;
}
TileClient&
TileClient::operator=(const TileClient& o)
{
if (this == &o) return *this;
mBackBuffer = o.mBackBuffer;
mFrontBuffer = o.mFrontBuffer;
mBackLock = o.mBackLock;
mFrontLock = o.mFrontLock;
mCompositableClient = nullptr;
#ifdef GFX_TILEDLAYER_DEBUG_OVERLAY
mLastUpdate = o.mLastUpdate;
#endif
mManager = o.mManager;
mInvalidFront = o.mInvalidFront;
mInvalidBack = o.mInvalidBack;
return *this;
}
void
TileClient::Flip()
{
#if defined(MOZ_WIDGET_GONK) && ANDROID_VERSION >= 17
if (mFrontBuffer && mFrontBuffer->GetIPDLActor() &&
mCompositableClient && mCompositableClient->GetIPDLActor()) {
// remove old buffer from CompositableHost
RefPtr<AsyncTransactionTracker> tracker = new RemoveTextureFromCompositableTracker();
// Hold TextureClient until transaction complete.
tracker->SetTextureClient(mFrontBuffer);
mFrontBuffer->SetRemoveFromCompositableTracker(tracker);
// RemoveTextureFromCompositableAsync() expects CompositorChild's presence.
mManager->AsShadowForwarder()->RemoveTextureFromCompositableAsync(tracker,
mCompositableClient,
mFrontBuffer);
}
#endif
RefPtr<TextureClient> frontBuffer = mFrontBuffer;
mFrontBuffer = mBackBuffer;
mBackBuffer = frontBuffer;
RefPtr<gfxSharedReadLock> frontLock = mFrontLock;
mFrontLock = mBackLock;
mBackLock = frontLock;
nsIntRegion invalidFront = mInvalidFront;
mInvalidFront = mInvalidBack;
mInvalidBack = invalidFront;
}
void
TileClient::ValidateBackBufferFromFront(const nsIntRegion& aDirtyRegion,
bool aCanRerasterizeValidRegion)
{
if (mBackBuffer && mFrontBuffer) {
gfx::IntSize tileSize = mFrontBuffer->GetSize();
const nsIntRect tileRect = nsIntRect(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);
if (regionToCopy.IsEmpty() ||
(aCanRerasterizeValidRegion &&
regionToCopy.Area() < tileSize.width * tileSize.height * MINIMUM_TILE_COPY_AREA)) {
// Just redraw it all.
return;
}
if (!mFrontBuffer->Lock(OpenMode::OPEN_READ)) {
NS_WARNING("Failed to lock the tile's front buffer");
return;
}
TextureClientAutoUnlock autoFront(mFrontBuffer);
if (!mBackBuffer->Lock(OpenMode::OPEN_WRITE)) {
NS_WARNING("Failed to lock the tile's back buffer");
return;
}
TextureClientAutoUnlock autoBack(mBackBuffer);
// 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 nsIntRect rectToCopy = regionToCopy.GetBounds();
gfx::IntRect gfxRectToCopy(rectToCopy.x, rectToCopy.y, rectToCopy.width, rectToCopy.height);
gfx::IntPoint gfxRectToCopyTopLeft = gfxRectToCopy.TopLeft();
mFrontBuffer->CopyToTextureClient(mBackBuffer, &gfxRectToCopy, &gfxRectToCopyTopLeft);
mInvalidBack.SetEmpty();
}
}
}
void
TileClient::DiscardFrontBuffer()
{
if (mFrontBuffer) {
MOZ_ASSERT(mFrontLock);
#if defined(MOZ_WIDGET_GONK) && ANDROID_VERSION >= 17
if (mFrontBuffer->GetIPDLActor() &&
mCompositableClient && mCompositableClient->GetIPDLActor()) {
// remove old buffer from CompositableHost
RefPtr<AsyncTransactionTracker> tracker = new RemoveTextureFromCompositableTracker();
// Hold TextureClient until transaction complete.
tracker->SetTextureClient(mFrontBuffer);
mFrontBuffer->SetRemoveFromCompositableTracker(tracker);
// RemoveTextureFromCompositableAsync() expects CompositorChild's presence.
mManager->AsShadowForwarder()->RemoveTextureFromCompositableAsync(tracker,
mCompositableClient,
mFrontBuffer);
}
#endif
mManager->GetTexturePool(mFrontBuffer->GetFormat())->ReturnTextureClientDeferred(mFrontBuffer);
mFrontLock->ReadUnlock();
mFrontBuffer = nullptr;
mFrontLock = nullptr;
}
}
void
TileClient::DiscardBackBuffer()
{
if (mBackBuffer) {
MOZ_ASSERT(mBackLock);
if (!mBackBuffer->ImplementsLocking() && mBackLock->GetReadCount() > 1) {
// 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.
mManager->GetTexturePool(mBackBuffer->GetFormat())->ReportClientLost();
} else {
#if defined(MOZ_WIDGET_GONK) && ANDROID_VERSION >= 17
if (mBackBuffer->GetIPDLActor() &&
mCompositableClient && mCompositableClient->GetIPDLActor()) {
// remove old buffer from CompositableHost
RefPtr<AsyncTransactionTracker> tracker = new RemoveTextureFromCompositableTracker();
// Hold TextureClient until transaction complete.
tracker->SetTextureClient(mBackBuffer);
mBackBuffer->SetRemoveFromCompositableTracker(tracker);
// RemoveTextureFromCompositableAsync() expects CompositorChild's presence.
mManager->AsShadowForwarder()->RemoveTextureFromCompositableAsync(tracker,
mCompositableClient,
mBackBuffer);
}
// TextureClient can be reused after transaction complete,
// when RemoveTextureFromCompositableTracker is used.
mManager->GetTexturePool(mBackBuffer->GetFormat())->ReturnTextureClientDeferred(mBackBuffer);
#else
mManager->GetTexturePool(mBackBuffer->GetFormat())->ReturnTextureClient(mBackBuffer);
#endif
}
mBackLock->ReadUnlock();
mBackBuffer = nullptr;
mBackLock = nullptr;
}
}
TextureClient*
TileClient::GetBackBuffer(const nsIntRegion& aDirtyRegion, TextureClientPool *aPool, bool *aCreatedTextureClient, bool aCanRerasterizeValidRegion)
{
// Try to re-use the front-buffer if possible
if (mFrontBuffer &&
mFrontBuffer->HasInternalBuffer() &&
mFrontLock->GetReadCount() == 1) {
// If we had a backbuffer we no longer care about it since we'll
// re-use the front buffer.
DiscardBackBuffer();
Flip();
return mBackBuffer;
}
if (!mBackBuffer ||
mBackLock->GetReadCount() > 1) {
if (mBackBuffer) {
// 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.
aPool->ReportClientLost();
}
mBackBuffer = aPool->GetTextureClient();
// Create a lock for our newly created back-buffer.
if (mManager->AsShadowForwarder()->IsSameProcess()) {
// If our compositor is in the same process, we can save some cycles by not
// using shared memory.
mBackLock = new gfxMemorySharedReadLock();
} else {
mBackLock = new gfxShmSharedReadLock(mManager->AsShadowForwarder());
}
MOZ_ASSERT(mBackLock->IsValid());
*aCreatedTextureClient = true;
mInvalidBack = nsIntRect(0, 0, mBackBuffer->GetSize().width, mBackBuffer->GetSize().height);
}
ValidateBackBufferFromFront(aDirtyRegion, aCanRerasterizeValidRegion);
return mBackBuffer;
}
TileDescriptor
TileClient::GetTileDescriptor()
{
if (IsPlaceholderTile()) {
return PlaceholderTileDescriptor();
}
MOZ_ASSERT(mFrontLock);
if (mFrontLock->GetType() == gfxSharedReadLock::TYPE_MEMORY) {
// AddRef here and Release when receiving on the host side to make sure the
// reference count doesn't go to zero before the host receives the message.
// see TiledLayerBufferComposite::TiledLayerBufferComposite
mFrontLock->AddRef();
}
if (mFrontLock->GetType() == gfxSharedReadLock::TYPE_MEMORY) {
return TexturedTileDescriptor(nullptr, mFrontBuffer->GetIPDLActor(),
TileLock(uintptr_t(mFrontLock.get())));
} else {
gfxShmSharedReadLock *lock = static_cast<gfxShmSharedReadLock*>(mFrontLock.get());
return TexturedTileDescriptor(nullptr, mFrontBuffer->GetIPDLActor(),
TileLock(lock->GetShmemSection()));
}
}
void
ClientTiledLayerBuffer::ReadUnlock() {
for (size_t i = 0; i < mRetainedTiles.Length(); i++) {
if (mRetainedTiles[i].IsPlaceholderTile()) continue;
mRetainedTiles[i].ReadUnlock();
}
}
void
ClientTiledLayerBuffer::ReadLock() {
for (size_t i = 0; i < mRetainedTiles.Length(); i++) {
if (mRetainedTiles[i].IsPlaceholderTile()) continue;
mRetainedTiles[i].ReadLock();
}
}
void
ClientTiledLayerBuffer::Release()
{
for (size_t i = 0; i < mRetainedTiles.Length(); i++) {
if (mRetainedTiles[i].IsPlaceholderTile()) continue;
mRetainedTiles[i].Release();
}
}
void
ClientTiledLayerBuffer::DiscardBuffers()
{
for (size_t i = 0; i < mRetainedTiles.Length(); i++) {
if (mRetainedTiles[i].IsPlaceholderTile()) continue;
mRetainedTiles[i].DiscardFrontBuffer();
mRetainedTiles[i].DiscardBackBuffer();
}
}
SurfaceDescriptorTiles
ClientTiledLayerBuffer::GetSurfaceDescriptorTiles()
{
InfallibleTArray<TileDescriptor> tiles;
for (size_t i = 0; i < mRetainedTiles.Length(); i++) {
TileDescriptor tileDesc;
if (mRetainedTiles.SafeElementAt(i, GetPlaceholderTile()) == GetPlaceholderTile()) {
tileDesc = PlaceholderTileDescriptor();
} else {
tileDesc = mRetainedTiles[i].GetTileDescriptor();
}
tiles.AppendElement(tileDesc);
}
return SurfaceDescriptorTiles(mValidRegion, mPaintedRegion,
tiles, mRetainedWidth, mRetainedHeight,
mResolution, mFrameResolution.scale);
}
void
ClientTiledLayerBuffer::PaintThebes(const nsIntRegion& aNewValidRegion,
const nsIntRegion& aPaintRegion,
LayerManager::DrawThebesLayerCallback aCallback,
void* aCallbackData)
{
TILING_LOG("TILING %p: PaintThebes painting region %s\n", mThebesLayer, Stringify(aPaintRegion).c_str());
TILING_LOG("TILING %p: PaintThebes new valid region %s\n", mThebesLayer, Stringify(aNewValidRegion).c_str());
mCallback = aCallback;
mCallbackData = aCallbackData;
#ifdef GFX_TILEDLAYER_PREF_WARNINGS
long start = PR_IntervalNow();
#endif
// If this region is empty XMost() - 1 will give us a negative value.
NS_ASSERTION(!aPaintRegion.GetBounds().IsEmpty(), "Empty paint region\n");
bool useSinglePaintBuffer = UseSinglePaintBuffer();
// XXX The single-tile case doesn't work at the moment, see bug 850396
/*
if (useSinglePaintBuffer) {
// Check if the paint only spans a single tile. If that's
// the case there's no point in using a single paint buffer.
nsIntRect paintBounds = aPaintRegion.GetBounds();
useSinglePaintBuffer = GetTileStart(paintBounds.x) !=
GetTileStart(paintBounds.XMost() - 1) ||
GetTileStart(paintBounds.y) !=
GetTileStart(paintBounds.YMost() - 1);
}
*/
if (useSinglePaintBuffer) {
nsRefPtr<gfxContext> ctxt;
const nsIntRect bounds = aPaintRegion.GetBounds();
{
PROFILER_LABEL("ClientTiledLayerBuffer", "PaintThebesSingleBufferAlloc",
js::ProfileEntry::Category::GRAPHICS);
gfxImageFormat format =
gfxPlatform::GetPlatform()->OptimalFormatForContent(
GetContentType());
mSinglePaintDrawTarget =
gfxPlatform::GetPlatform()->CreateOffscreenContentDrawTarget(
gfx::IntSize(ceilf(bounds.width * mResolution),
ceilf(bounds.height * mResolution)),
gfx::ImageFormatToSurfaceFormat(format));
if (!mSinglePaintDrawTarget) {
return;
}
ctxt = new gfxContext(mSinglePaintDrawTarget);
mSinglePaintBufferOffset = nsIntPoint(bounds.x, bounds.y);
}
ctxt->NewPath();
ctxt->Scale(mResolution, mResolution);
ctxt->Translate(gfxPoint(-bounds.x, -bounds.y));
#ifdef GFX_TILEDLAYER_PREF_WARNINGS
if (PR_IntervalNow() - start > 3) {
printf_stderr("Slow alloc %i\n", PR_IntervalNow() - start);
}
start = PR_IntervalNow();
#endif
PROFILER_LABEL("ClientTiledLayerBuffer", "PaintThebesSingleBufferDraw",
js::ProfileEntry::Category::GRAPHICS);
mCallback(mThebesLayer, ctxt, aPaintRegion, DrawRegionClip::CLIP_NONE, nsIntRegion(), mCallbackData);
}
#ifdef GFX_TILEDLAYER_PREF_WARNINGS
if (PR_IntervalNow() - start > 30) {
const nsIntRect 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");
nsIntRegionRectIterator it(aPaintRegion);
for (const nsIntRect* rect = it.Next(); rect != nullptr; rect = it.Next()) {
printf_stderr(" rect %i, %i, %i, %i\n", rect->x, rect->y, rect->width, rect->height);
}
}
}
start = PR_IntervalNow();
#endif
PROFILER_LABEL("ClientTiledLayerBuffer", "PaintThebesUpdate",
js::ProfileEntry::Category::GRAPHICS);
Update(aNewValidRegion, aPaintRegion);
#ifdef GFX_TILEDLAYER_PREF_WARNINGS
if (PR_IntervalNow() - start > 10) {
const nsIntRect 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
mLastPaintOpaque = mThebesLayer->CanUseOpaqueSurface();
mCallback = nullptr;
mCallbackData = nullptr;
mSinglePaintDrawTarget = 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 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);
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);
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);
}
}
TileClient
ClientTiledLayerBuffer::ValidateTile(TileClient aTile,
const nsIntPoint& aTileOrigin,
const nsIntRegion& aDirtyRegion)
{
PROFILER_LABEL("ClientTiledLayerBuffer", "ValidateTile",
js::ProfileEntry::Category::GRAPHICS);
#ifdef GFX_TILEDLAYER_PREF_WARNINGS
if (aDirtyRegion.IsComplex()) {
printf_stderr("Complex region\n");
}
#endif
if (aTile.IsPlaceholderTile()) {
aTile.SetLayerManager(mManager);
}
aTile.SetCompositableClient(mCompositableClient);
// Discard our front and backbuffers if our contents changed. In this case
// the calling code will already have taken care of invalidating the entire
// layer.
if (HasFormatChanged()) {
aTile.DiscardBackBuffer();
aTile.DiscardFrontBuffer();
}
bool createdTextureClient = false;
nsIntRegion offsetScaledDirtyRegion = aDirtyRegion.MovedBy(-aTileOrigin);
offsetScaledDirtyRegion.ScaleRoundOut(mResolution, mResolution);
bool usingSinglePaintBuffer = !!mSinglePaintDrawTarget;
RefPtr<TextureClient> backBuffer =
aTile.GetBackBuffer(offsetScaledDirtyRegion,
mManager->GetTexturePool(gfxPlatform::GetPlatform()->Optimal2DFormatForContent(GetContentType())),
&createdTextureClient, !usingSinglePaintBuffer);
if (!backBuffer || !backBuffer->Lock(OpenMode::OPEN_READ_WRITE)) {
NS_WARNING("Failed to lock tile TextureClient for updating.");
aTile.DiscardFrontBuffer();
aTile.DiscardBackBuffer();
return aTile;
}
// We must not keep a reference to the DrawTarget after it has been unlocked,
// make sure these are null'd before unlocking as destruction of the context
// may cause the target to be flushed.
RefPtr<DrawTarget> drawTarget = backBuffer->BorrowDrawTarget();
drawTarget->SetTransform(Matrix());
RefPtr<gfxContext> ctxt = new gfxContext(drawTarget);
if (usingSinglePaintBuffer) {
// XXX Perhaps we should just copy the bounding rectangle here?
RefPtr<gfx::SourceSurface> source = mSinglePaintDrawTarget->Snapshot();
nsIntRegionRectIterator it(aDirtyRegion);
for (const nsIntRect* dirtyRect = it.Next(); dirtyRect != nullptr; dirtyRect = it.Next()) {
#ifdef GFX_TILEDLAYER_PREF_WARNINGS
printf_stderr(" break into subdirtyRect %i, %i, %i, %i\n",
dirtyRect->x, dirtyRect->y, dirtyRect->width, dirtyRect->height);
#endif
gfx::Rect drawRect(dirtyRect->x - aTileOrigin.x,
dirtyRect->y - aTileOrigin.y,
dirtyRect->width,
dirtyRect->height);
drawRect.Scale(mResolution);
gfx::IntRect copyRect(NS_roundf((dirtyRect->x - mSinglePaintBufferOffset.x) * mResolution),
NS_roundf((dirtyRect->y - mSinglePaintBufferOffset.y) * mResolution),
drawRect.width,
drawRect.height);
gfx::IntPoint copyTarget(NS_roundf(drawRect.x), NS_roundf(drawRect.y));
drawTarget->CopySurface(source, copyRect, copyTarget);
// Mark the newly updated area as invalid in the front buffer
aTile.mInvalidFront.Or(aTile.mInvalidFront, nsIntRect(copyTarget.x, copyTarget.y, copyRect.width, copyRect.height));
}
// only worry about padding when not doing low-res
// because it simplifies the math and the artifacts
// won't be noticable
if (mResolution == 1) {
nsIntRect unscaledTile = nsIntRect(aTileOrigin.x,
aTileOrigin.y,
GetTileSize().width,
GetTileSize().height);
nsIntRegion tileValidRegion = GetValidRegion();
tileValidRegion.Or(tileValidRegion, aDirtyRegion);
// We only need to pad out if the tile has area that's not valid
if (!tileValidRegion.Contains(unscaledTile)) {
tileValidRegion = tileValidRegion.Intersect(unscaledTile);
// translate the region into tile space and pad
tileValidRegion.MoveBy(-nsIntPoint(unscaledTile.x, unscaledTile.y));
PadDrawTargetOutFromRegion(drawTarget, tileValidRegion);
}
}
// The new buffer is now validated, remove the dirty region from it.
aTile.mInvalidBack.Sub(nsIntRect(0, 0, GetTileSize().width, GetTileSize().height),
offsetScaledDirtyRegion);
} else {
// Area of the full tile...
nsIntRegion tileRegion =
nsIntRect(aTileOrigin.x, aTileOrigin.y,
GetScaledTileSize().width, GetScaledTileSize().height);
// Intersect this area with the portion that's dirty.
tileRegion = tileRegion.Intersect(aDirtyRegion);
// Add the resolution scale to store the dirty region.
nsIntPoint unscaledTileOrigin = nsIntPoint(aTileOrigin.x * mResolution,
aTileOrigin.y * mResolution);
nsIntRegion unscaledTileRegion(tileRegion);
unscaledTileRegion.ScaleRoundOut(mResolution, mResolution);
// Move invalid areas into scaled layer space.
aTile.mInvalidFront.MoveBy(unscaledTileOrigin);
aTile.mInvalidBack.MoveBy(unscaledTileOrigin);
// Add the area that's going to be redrawn to the invalid area of the
// front region.
aTile.mInvalidFront.Or(aTile.mInvalidFront, unscaledTileRegion);
// Add invalid areas of the backbuffer to the area to redraw.
tileRegion.Or(tileRegion, aTile.mInvalidBack);
// Move invalid areas back into tile space.
aTile.mInvalidFront.MoveBy(-unscaledTileOrigin);
// This will be validated now.
aTile.mInvalidBack.SetEmpty();
nsIntRect bounds = tileRegion.GetBounds();
bounds.MoveBy(-aTileOrigin);
if (GetContentType() != gfxContentType::COLOR) {
drawTarget->ClearRect(Rect(bounds.x, bounds.y, bounds.width, bounds.height));
}
ctxt->NewPath();
ctxt->Clip(gfxRect(bounds.x, bounds.y, bounds.width, bounds.height));
ctxt->Translate(gfxPoint(-unscaledTileOrigin.x, -unscaledTileOrigin.y));
ctxt->Scale(mResolution, mResolution);
mCallback(mThebesLayer, ctxt,
tileRegion.GetBounds(),
DrawRegionClip::CLIP_NONE,
nsIntRegion(), mCallbackData);
}
#ifdef GFX_TILEDLAYER_DEBUG_OVERLAY
DrawDebugOverlay(drawTarget, aTileOrigin.x * mResolution,
aTileOrigin.y * mResolution, GetTileLength(), GetTileLength());
#endif
ctxt = nullptr;
drawTarget = nullptr;
nsIntRegion tileRegion =
nsIntRect(aTileOrigin.x, aTileOrigin.y,
GetScaledTileSize().width, GetScaledTileSize().height);
// Intersect this area with the portion that's invalid.
tileRegion = tileRegion.Sub(tileRegion, GetValidRegion());
tileRegion = tileRegion.Sub(tileRegion, aDirtyRegion); // Has now been validated
backBuffer->SetWaste(tileRegion.Area() * mResolution * mResolution);
backBuffer->Unlock();
if (createdTextureClient) {
if (!mCompositableClient->AddTextureClient(backBuffer)) {
NS_WARNING("Failed to add tile TextureClient.");
aTile.DiscardFrontBuffer();
aTile.DiscardBackBuffer();
return aTile;
}
}
aTile.Flip();
// Note, we don't call UpdatedTexture. The Updated function is called manually
// by the TiledContentHost before composition.
if (backBuffer->HasInternalBuffer()) {
// If our new buffer has an internal buffer, we don't want to keep another
// TextureClient around unnecessarily, so discard the back-buffer.
aTile.DiscardBackBuffer();
}
return aTile;
}
/**
* 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 replaces the nontransient async transform that was injected
* in GetTransformToAncestorsParentLayer with the complete async transform.
* This function then returns the scroll ancestor's composition bounds,
* transformed into the thebes layer's LayerPixel coordinates, accounting
* for the compositor state.
*/
static LayerRect
GetCompositorSideCompositionBounds(ContainerLayer* aScrollAncestor,
const gfx3DMatrix& aTransformToCompBounds,
const ViewTransform& aAPZTransform)
{
gfx3DMatrix nonTransientAPZTransform = gfx3DMatrix::ScalingMatrix(
aScrollAncestor->GetFrameMetrics().mResolution.scale,
aScrollAncestor->GetFrameMetrics().mResolution.scale,
1.f);
gfx3DMatrix layerTransform = gfx::To3DMatrix(aScrollAncestor->GetTransform());
// First take off the last two "terms" of aTransformToCompBounds, which
// are the scroll ancestor's local transform and the APZ's nontransient async
// transform.
gfx3DMatrix transform = aTransformToCompBounds;
transform = transform * layerTransform.Inverse();
transform = transform * nonTransientAPZTransform.Inverse();
// Next, apply the APZ's async transform (this includes the nontransient component
// as well).
transform = transform * gfx3DMatrix(aAPZTransform);
// Finally, put back the scroll ancestor's local transform.
transform = transform * layerTransform;
return TransformTo<LayerPixel>(transform.Inverse(),
aScrollAncestor->GetFrameMetrics().mCompositionBounds);
}
bool
ClientTiledLayerBuffer::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", mThebesLayer, Stringify(staleRegion).c_str());
ContainerLayer* scrollAncestor = nullptr;
mThebesLayer->GetAncestorLayers(&scrollAncestor, 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.
ViewTransform viewTransform;
#if defined(MOZ_WIDGET_ANDROID)
FrameMetrics compositorMetrics = scrollAncestor->GetFrameMetrics();
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 (scrollAncestor == mManager->GetPrimaryScrollableLayer()) {
abortPaint = mManager->ProgressiveUpdateCallback(!staleRegion.Contains(aInvalidRegion),
compositorMetrics,
!drawingLowPrecision);
viewTransform = ComputeViewTransform(scrollAncestor->GetFrameMetrics(), compositorMetrics);
}
#else
MOZ_ASSERT(mSharedFrameMetricsHelper);
bool abortPaint =
mSharedFrameMetricsHelper->UpdateFromCompositorFrameMetrics(
scrollAncestor,
!staleRegion.Contains(aInvalidRegion),
drawingLowPrecision,
viewTransform);
#endif
TILING_LOG("TILING %p: Progressive update view transform %f %f zoom %f abort %d\n", mThebesLayer, viewTransform.mTranslation.x, viewTransform.mTranslation.y, 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("ClientTiledLayerBuffer", "ComputeProgressiveUpdateRegion",
js::ProfileEntry::Category::GRAPHICS);
aRegionToPaint.SetEmpty();
return aIsRepeated;
}
}
LayerRect transformedCompositionBounds =
GetCompositorSideCompositionBounds(scrollAncestor,
aPaintData->mTransformToCompBounds,
viewTransform);
TILING_LOG("TILING %p: Progressive update transformed compositor bounds %s\n", mThebesLayer, 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.
nsIntRect coherentUpdateRect(LayerIntRect::ToUntyped(RoundedOut(
#ifdef MOZ_WIDGET_ANDROID
transformedCompositionBounds.Intersect(aPaintData->mCompositionBounds)
#else
transformedCompositionBounds
#endif
)));
TILING_LOG("TILING %p: Progressive update final coherency rect %s\n", mThebesLayer, 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", mThebesLayer, 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",
mThebesLayer, 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!");
nsIntRect 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.
nsIntRect 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()) {
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
ClientTiledLayerBuffer::ProgressiveUpdate(nsIntRegion& aValidRegion,
nsIntRegion& aInvalidRegion,
const nsIntRegion& aOldValidRegion,
BasicTiledLayerPaintData* aPaintData,
LayerManager::DrawThebesLayerCallback aCallback,
void* aCallbackData)
{
TILING_LOG("TILING %p: Progressive update valid region %s\n", mThebesLayer, Stringify(aValidRegion).c_str());
TILING_LOG("TILING %p: Progressive update invalid region %s\n", mThebesLayer, Stringify(aInvalidRegion).c_str());
TILING_LOG("TILING %p: Progressive update old valid region %s\n", mThebesLayer, 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", mThebesLayer, 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, aCallback, aCallbackData);
aInvalidRegion.Sub(aInvalidRegion, regionToPaint);
} while (repeat);
TILING_LOG("TILING %p: Progressive update final valid region %s buffer changed %d\n", mThebesLayer, Stringify(aValidRegion).c_str(), isBufferChanged);
TILING_LOG("TILING %p: Progressive update final invalid region %s\n", mThebesLayer, 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;
}
}
}
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