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gecko/gfx/layers/basic/BasicLayerManager.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include <stdint.h> // for uint32_t
#include <stdlib.h> // for rand, RAND_MAX
#include <sys/types.h> // for int32_t
#include "BasicContainerLayer.h" // for BasicContainerLayer
#include "BasicLayersImpl.h" // for ToData, BasicReadbackLayer, etc
#include "GeckoProfiler.h" // for PROFILER_LABEL
#include "ImageContainer.h" // for ImageFactory
#include "Layers.h" // for Layer, ContainerLayer, etc
#include "ReadbackLayer.h" // for ReadbackLayer
#include "ReadbackProcessor.h" // for ReadbackProcessor
#include "RenderTrace.h" // for RenderTraceLayers, etc
#include "basic/BasicImplData.h" // for BasicImplData
#include "basic/BasicLayers.h" // for BasicLayerManager, etc
#include "gfx3DMatrix.h" // for gfx3DMatrix
#include "gfxASurface.h" // for gfxASurface, etc
#include "gfxCachedTempSurface.h" // for gfxCachedTempSurface
#include "gfxColor.h" // for gfxRGBA
#include "gfxContext.h" // for gfxContext, etc
#include "gfxImageSurface.h" // for gfxImageSurface
#include "gfxMatrix.h" // for gfxMatrix
#include "gfxPlatform.h" // for gfxPlatform
#include "gfxPoint.h" // for gfxIntSize, gfxPoint
#include "gfxRect.h" // for gfxRect
#include "gfxUtils.h" // for gfxUtils
#include "mozilla/Assertions.h" // for MOZ_ASSERT, etc
#include "mozilla/WidgetUtils.h" // for ScreenRotation
#include "mozilla/gfx/2D.h" // for DrawTarget
#include "mozilla/gfx/BasePoint.h" // for BasePoint
#include "mozilla/gfx/BaseRect.h" // for BaseRect
#include "mozilla/gfx/Matrix.h" // for Matrix
#include "mozilla/gfx/Rect.h" // for IntRect, Rect
#include "mozilla/layers/LayersTypes.h" // for BufferMode::BUFFER_NONE, etc
#include "mozilla/mozalloc.h" // for operator new
#include "nsAutoPtr.h" // for nsRefPtr
#include "nsCOMPtr.h" // for already_AddRefed
#include "nsDebug.h" // for NS_ASSERTION, etc
#include "nsISupportsImpl.h" // for gfxContext::Release, etc
#include "nsPoint.h" // for nsIntPoint
#include "nsRect.h" // for nsIntRect
#include "nsRegion.h" // for nsIntRegion, etc
#include "nsTArray.h" // for nsAutoTArray
#include "nsTraceRefcnt.h" // for MOZ_COUNT_CTOR, etc
#define PIXMAN_DONT_DEFINE_STDINT
#include "pixman.h" // for pixman_f_transform, etc
class nsIWidget;
using namespace mozilla::dom;
using namespace mozilla::gfx;
namespace mozilla {
namespace layers {
/**
* Clips to the smallest device-pixel-aligned rectangle containing aRect
* in user space.
* Returns true if the clip is "perfect", i.e. we actually clipped exactly to
* aRect.
*/
static bool
ClipToContain(gfxContext* aContext, const nsIntRect& aRect)
{
gfxRect userRect(aRect.x, aRect.y, aRect.width, aRect.height);
gfxRect deviceRect = aContext->UserToDevice(userRect);
deviceRect.RoundOut();
gfxMatrix currentMatrix = aContext->CurrentMatrix();
aContext->IdentityMatrix();
aContext->NewPath();
aContext->Rectangle(deviceRect);
aContext->Clip();
aContext->SetMatrix(currentMatrix);
return aContext->DeviceToUser(deviceRect).IsEqualInterior(userRect);
}
already_AddRefed<gfxContext>
BasicLayerManager::PushGroupForLayer(gfxContext* aContext, Layer* aLayer,
const nsIntRegion& aRegion,
bool* aNeedsClipToVisibleRegion)
{
// If we need to call PushGroup, we should clip to the smallest possible
// area first to minimize the size of the temporary surface.
bool didCompleteClip = ClipToContain(aContext, aRegion.GetBounds());
nsRefPtr<gfxContext> result;
if (aLayer->CanUseOpaqueSurface() &&
((didCompleteClip && aRegion.GetNumRects() == 1) ||
!aContext->CurrentMatrix().HasNonIntegerTranslation())) {
// If the layer is opaque in its visible region we can push a GFX_CONTENT_COLOR
// group. We need to make sure that only pixels inside the layer's visible
// region are copied back to the destination. Remember if we've already
// clipped precisely to the visible region.
*aNeedsClipToVisibleRegion = !didCompleteClip || aRegion.GetNumRects() > 1;
MOZ_ASSERT(!aContext->IsCairo());
result = PushGroupWithCachedSurface(aContext, GFX_CONTENT_COLOR);
} else {
*aNeedsClipToVisibleRegion = false;
result = aContext;
if (aLayer->GetContentFlags() & Layer::CONTENT_COMPONENT_ALPHA) {
aContext->PushGroupAndCopyBackground(GFX_CONTENT_COLOR_ALPHA);
} else {
aContext->PushGroup(GFX_CONTENT_COLOR_ALPHA);
}
}
return result.forget();
}
static nsIntRect
ToOutsideIntRect(const gfxRect &aRect)
{
gfxRect r = aRect;
r.RoundOut();
return nsIntRect(r.X(), r.Y(), r.Width(), r.Height());
}
static nsIntRect
ToInsideIntRect(const gfxRect& aRect)
{
gfxRect r = aRect;
r.RoundIn();
return nsIntRect(r.X(), r.Y(), r.Width(), r.Height());
}
// A context helper for BasicLayerManager::PaintLayer() that holds all the
// painting context together in a data structure so it can be easily passed
// around. It also uses ensures that the Transform and Opaque rect are restored
// to their former state on destruction.
class PaintLayerContext {
public:
PaintLayerContext(gfxContext* aTarget, Layer* aLayer,
LayerManager::DrawThebesLayerCallback aCallback,
void* aCallbackData, ReadbackProcessor* aReadback)
: mTarget(aTarget)
, mTargetMatrixSR(aTarget)
, mLayer(aLayer)
, mCallback(aCallback)
, mCallbackData(aCallbackData)
, mReadback(aReadback)
, mPushedOpaqueRect(false)
{}
~PaintLayerContext()
{
// Matrix is restored by mTargetMatrixSR
if (mPushedOpaqueRect)
{
ClearOpaqueRect();
}
}
// Gets the effective transform and returns true if it is a 2D
// transform.
bool Setup2DTransform()
{
const gfx3DMatrix& effectiveTransform = mLayer->GetEffectiveTransform();
// Will return an identity matrix for 3d transforms.
return effectiveTransform.CanDraw2D(&mTransform);
}
// Applies the effective transform if it's 2D. If it's a 3D transform then
// it applies an identity.
void Apply2DTransform()
{
mTarget->SetMatrix(mTransform);
}
// Set the opaque rect to match the bounds of the visible region.
void AnnotateOpaqueRect()
{
const nsIntRegion& visibleRegion = mLayer->GetEffectiveVisibleRegion();
const nsIntRect& bounds = visibleRegion.GetBounds();
if (mTarget->IsCairo()) {
nsRefPtr<gfxASurface> currentSurface = mTarget->CurrentSurface();
const gfxRect& targetOpaqueRect = currentSurface->GetOpaqueRect();
// Try to annotate currentSurface with a region of pixels that have been
// (or will be) painted opaque, if no such region is currently set.
if (targetOpaqueRect.IsEmpty() && visibleRegion.GetNumRects() == 1 &&
(mLayer->GetContentFlags() & Layer::CONTENT_OPAQUE) &&
!mTransform.HasNonAxisAlignedTransform()) {
currentSurface->SetOpaqueRect(
mTarget->UserToDevice(gfxRect(bounds.x, bounds.y, bounds.width, bounds.height)));
mPushedOpaqueRect = true;
}
} else {
DrawTarget *dt = mTarget->GetDrawTarget();
const IntRect& targetOpaqueRect = dt->GetOpaqueRect();
// Try to annotate currentSurface with a region of pixels that have been
// (or will be) painted opaque, if no such region is currently set.
if (targetOpaqueRect.IsEmpty() && visibleRegion.GetNumRects() == 1 &&
(mLayer->GetContentFlags() & Layer::CONTENT_OPAQUE) &&
!mTransform.HasNonAxisAlignedTransform()) {
gfx::Rect opaqueRect = dt->GetTransform().TransformBounds(
gfx::Rect(bounds.x, bounds.y, bounds.width, bounds.height));
opaqueRect.RoundIn();
IntRect intOpaqueRect;
if (opaqueRect.ToIntRect(&intOpaqueRect)) {
mTarget->GetDrawTarget()->SetOpaqueRect(intOpaqueRect);
mPushedOpaqueRect = true;
}
}
}
}
// Clear the Opaque rect. Although this doesn't really restore it to it's
// previous state it will happen on the exit path of the PaintLayer() so when
// painting is complete the opaque rect qill be clear.
void ClearOpaqueRect() {
if (mTarget->IsCairo()) {
nsRefPtr<gfxASurface> currentSurface = mTarget->CurrentSurface();
currentSurface->SetOpaqueRect(gfxRect());
} else {
mTarget->GetDrawTarget()->SetOpaqueRect(IntRect());
}
}
gfxContext* mTarget;
gfxContextMatrixAutoSaveRestore mTargetMatrixSR;
Layer* mLayer;
LayerManager::DrawThebesLayerCallback mCallback;
void* mCallbackData;
ReadbackProcessor* mReadback;
gfxMatrix mTransform;
bool mPushedOpaqueRect;
};
BasicLayerManager::BasicLayerManager(nsIWidget* aWidget) :
mPhase(PHASE_NONE),
mWidget(aWidget)
, mDoubleBuffering(BUFFER_NONE), mUsingDefaultTarget(false)
, mCachedSurfaceInUse(false)
, mTransactionIncomplete(false)
, mCompositorMightResample(false)
{
MOZ_COUNT_CTOR(BasicLayerManager);
NS_ASSERTION(aWidget, "Must provide a widget");
}
BasicLayerManager::BasicLayerManager() :
mPhase(PHASE_NONE),
mWidget(nullptr)
, mDoubleBuffering(BUFFER_NONE), mUsingDefaultTarget(false)
, mCachedSurfaceInUse(false)
, mTransactionIncomplete(false)
{
MOZ_COUNT_CTOR(BasicLayerManager);
}
BasicLayerManager::~BasicLayerManager()
{
NS_ASSERTION(!InTransaction(), "Died during transaction?");
ClearCachedResources();
mRoot = nullptr;
MOZ_COUNT_DTOR(BasicLayerManager);
}
void
BasicLayerManager::SetDefaultTarget(gfxContext* aContext)
{
NS_ASSERTION(!InTransaction(),
"Must set default target outside transaction");
mDefaultTarget = aContext;
}
void
BasicLayerManager::SetDefaultTargetConfiguration(BufferMode aDoubleBuffering, ScreenRotation aRotation)
{
mDoubleBuffering = aDoubleBuffering;
}
void
BasicLayerManager::BeginTransaction()
{
mInTransaction = true;
mUsingDefaultTarget = true;
BeginTransactionWithTarget(mDefaultTarget);
}
already_AddRefed<gfxContext>
BasicLayerManager::PushGroupWithCachedSurface(gfxContext *aTarget,
gfxContentType aContent)
{
nsRefPtr<gfxContext> ctx;
// We can't cache Azure DrawTargets at this point.
if (!mCachedSurfaceInUse && aTarget->IsCairo()) {
gfxContextMatrixAutoSaveRestore saveMatrix(aTarget);
aTarget->IdentityMatrix();
nsRefPtr<gfxASurface> currentSurf = aTarget->CurrentSurface();
gfxRect clip = aTarget->GetClipExtents();
clip.RoundOut();
ctx = mCachedSurface.Get(aContent, clip, currentSurf);
if (ctx) {
mCachedSurfaceInUse = true;
/* Align our buffer for the original surface */
ctx->SetMatrix(saveMatrix.Matrix());
return ctx.forget();
}
}
ctx = aTarget;
ctx->PushGroup(aContent);
return ctx.forget();
}
void
BasicLayerManager::PopGroupToSourceWithCachedSurface(gfxContext *aTarget, gfxContext *aPushed)
{
if (!aTarget)
return;
if (aTarget->IsCairo()) {
nsRefPtr<gfxASurface> current = aPushed->CurrentSurface();
if (mCachedSurface.IsSurface(current)) {
gfxContextMatrixAutoSaveRestore saveMatrix(aTarget);
aTarget->IdentityMatrix();
aTarget->SetSource(current);
mCachedSurfaceInUse = false;
return;
}
}
aTarget->PopGroupToSource();
}
void
BasicLayerManager::BeginTransactionWithTarget(gfxContext* aTarget)
{
mInTransaction = true;
#ifdef MOZ_LAYERS_HAVE_LOG
MOZ_LAYERS_LOG(("[----- BeginTransaction"));
Log();
#endif
NS_ASSERTION(!InTransaction(), "Nested transactions not allowed");
mPhase = PHASE_CONSTRUCTION;
mTarget = aTarget;
}
static void
TransformIntRect(nsIntRect& aRect, const gfxMatrix& aMatrix,
nsIntRect (*aRoundMethod)(const gfxRect&))
{
gfxRect gr = gfxRect(aRect.x, aRect.y, aRect.width, aRect.height);
gr = aMatrix.TransformBounds(gr);
aRect = (*aRoundMethod)(gr);
}
/**
* This function assumes that GetEffectiveTransform transforms
* all layers to the same coordinate system (the "root coordinate system").
* It can't be used as is by accelerated layers because of intermediate surfaces.
* This must set the hidden flag to true or false on *all* layers in the subtree.
* It also sets the operator for all layers to "OVER", and call
* SetDrawAtomically(false).
* It clears mClipToVisibleRegion on all layers.
* @param aClipRect the cliprect, in the root coordinate system. We assume
* that any layer drawing is clipped to this rect. It is therefore not
* allowed to add to the opaque region outside that rect.
* @param aDirtyRect the dirty rect that will be painted, in the root
* coordinate system. Layers outside this rect should be hidden.
* @param aOpaqueRegion the opaque region covering aLayer, in the
* root coordinate system.
*/
enum {
ALLOW_OPAQUE = 0x01,
};
static void
MarkLayersHidden(Layer* aLayer, const nsIntRect& aClipRect,
const nsIntRect& aDirtyRect,
nsIntRegion& aOpaqueRegion,
uint32_t aFlags)
{
nsIntRect newClipRect(aClipRect);
uint32_t newFlags = aFlags;
// Allow aLayer or aLayer's descendants to cover underlying layers
// only if it's opaque.
if (aLayer->GetOpacity() != 1.0f) {
newFlags &= ~ALLOW_OPAQUE;
}
{
const nsIntRect* clipRect = aLayer->GetEffectiveClipRect();
if (clipRect) {
nsIntRect cr = *clipRect;
// clipRect is in the container's coordinate system. Get it into the
// global coordinate system.
if (aLayer->GetParent()) {
gfxMatrix tr;
if (aLayer->GetParent()->GetEffectiveTransform().CanDraw2D(&tr)) {
// Clip rect is applied after aLayer's transform, i.e., in the coordinate
// system of aLayer's parent.
TransformIntRect(cr, tr, ToInsideIntRect);
} else {
cr.SetRect(0, 0, 0, 0);
}
}
newClipRect.IntersectRect(newClipRect, cr);
}
}
BasicImplData* data = ToData(aLayer);
data->SetOperator(gfxContext::OPERATOR_OVER);
data->SetClipToVisibleRegion(false);
data->SetDrawAtomically(false);
if (!aLayer->AsContainerLayer()) {
gfxMatrix transform;
if (!aLayer->GetEffectiveTransform().CanDraw2D(&transform)) {
data->SetHidden(false);
return;
}
nsIntRegion region = aLayer->GetEffectiveVisibleRegion();
nsIntRect r = region.GetBounds();
TransformIntRect(r, transform, ToOutsideIntRect);
r.IntersectRect(r, aDirtyRect);
data->SetHidden(aOpaqueRegion.Contains(r));
// Allow aLayer to cover underlying layers only if aLayer's
// content is opaque
if ((aLayer->GetContentFlags() & Layer::CONTENT_OPAQUE) &&
(newFlags & ALLOW_OPAQUE)) {
nsIntRegionRectIterator it(region);
while (const nsIntRect* sr = it.Next()) {
r = *sr;
TransformIntRect(r, transform, ToInsideIntRect);
r.IntersectRect(r, newClipRect);
aOpaqueRegion.Or(aOpaqueRegion, r);
}
}
} else {
Layer* child = aLayer->GetLastChild();
bool allHidden = true;
for (; child; child = child->GetPrevSibling()) {
MarkLayersHidden(child, newClipRect, aDirtyRect, aOpaqueRegion, newFlags);
if (!ToData(child)->IsHidden()) {
allHidden = false;
}
}
data->SetHidden(allHidden);
}
}
/**
* This function assumes that GetEffectiveTransform transforms
* all layers to the same coordinate system (the "root coordinate system").
* MarkLayersHidden must be called before calling this.
* @param aVisibleRect the rectangle of aLayer that is visible (i.e. not
* clipped and in the dirty rect), in the root coordinate system.
*/
static void
ApplyDoubleBuffering(Layer* aLayer, const nsIntRect& aVisibleRect)
{
BasicImplData* data = ToData(aLayer);
if (data->IsHidden())
return;
nsIntRect newVisibleRect(aVisibleRect);
{
const nsIntRect* clipRect = aLayer->GetEffectiveClipRect();
if (clipRect) {
nsIntRect cr = *clipRect;
// clipRect is in the container's coordinate system. Get it into the
// global coordinate system.
if (aLayer->GetParent()) {
gfxMatrix tr;
if (aLayer->GetParent()->GetEffectiveTransform().CanDraw2D(&tr)) {
NS_ASSERTION(!tr.HasNonIntegerTranslation(),
"Parent can only have an integer translation");
cr += nsIntPoint(int32_t(tr.x0), int32_t(tr.y0));
} else {
NS_ERROR("Parent can only have an integer translation");
}
}
newVisibleRect.IntersectRect(newVisibleRect, cr);
}
}
BasicContainerLayer* container =
static_cast<BasicContainerLayer*>(aLayer->AsContainerLayer());
// Layers that act as their own backbuffers should be drawn to the destination
// using OPERATOR_SOURCE to ensure that alpha values in a transparent window
// are cleared. This can also be faster than OPERATOR_OVER.
if (!container) {
data->SetOperator(gfxContext::OPERATOR_SOURCE);
data->SetDrawAtomically(true);
} else {
if (container->UseIntermediateSurface() ||
!container->ChildrenPartitionVisibleRegion(newVisibleRect)) {
// We need to double-buffer this container.
data->SetOperator(gfxContext::OPERATOR_SOURCE);
container->ForceIntermediateSurface();
} else {
// Tell the children to clip to their visible regions so our assumption
// that they don't paint outside their visible regions is valid!
for (Layer* child = aLayer->GetFirstChild(); child;
child = child->GetNextSibling()) {
ToData(child)->SetClipToVisibleRegion(true);
ApplyDoubleBuffering(child, newVisibleRect);
}
}
}
}
void
BasicLayerManager::EndTransaction(DrawThebesLayerCallback aCallback,
void* aCallbackData,
EndTransactionFlags aFlags)
{
mInTransaction = false;
EndTransactionInternal(aCallback, aCallbackData, aFlags);
}
void
BasicLayerManager::AbortTransaction()
{
NS_ASSERTION(InConstruction(), "Should be in construction phase");
mPhase = PHASE_NONE;
mUsingDefaultTarget = false;
mInTransaction = false;
}
static uint16_t sFrameCount = 0;
void
BasicLayerManager::RenderDebugOverlay()
{
if (!gfxPlatform::DrawFrameCounter()) {
return;
}
profiler_set_frame_number(sFrameCount);
uint16_t frameNumber = sFrameCount;
const uint16_t bitWidth = 3;
for (size_t i = 0; i < 16; i++) {
gfxRGBA bitColor;
if ((frameNumber >> i) & 0x1) {
bitColor = gfxRGBA(0, 0, 0, 1.0);
} else {
bitColor = gfxRGBA(1.0, 1.0, 1.0, 1.0);
}
mTarget->NewPath();
mTarget->SetColor(bitColor);
mTarget->Rectangle(gfxRect(bitWidth*i, 0, bitWidth, bitWidth));
mTarget->Fill();
}
// We intentionally overflow at 2^16.
sFrameCount++;
}
bool
BasicLayerManager::EndTransactionInternal(DrawThebesLayerCallback aCallback,
void* aCallbackData,
EndTransactionFlags aFlags)
{
PROFILER_LABEL("BasicLayerManager", "EndTransactionInternal");
#ifdef MOZ_LAYERS_HAVE_LOG
MOZ_LAYERS_LOG((" ----- (beginning paint)"));
Log();
#endif
NS_ASSERTION(InConstruction(), "Should be in construction phase");
mPhase = PHASE_DRAWING;
RenderTraceLayers(mRoot, "FF00");
mTransactionIncomplete = false;
if (mRoot) {
// Need to do this before we call ApplyDoubleBuffering,
// which depends on correct effective transforms
mSnapEffectiveTransforms =
mTarget ? !(mTarget->GetFlags() & gfxContext::FLAG_DISABLE_SNAPPING) : true;
mRoot->ComputeEffectiveTransforms(mTarget ? gfx3DMatrix::From2D(mTarget->CurrentMatrix()) : gfx3DMatrix());
ToData(mRoot)->Validate(aCallback, aCallbackData);
if (mRoot->GetMaskLayer()) {
ToData(mRoot->GetMaskLayer())->Validate(aCallback, aCallbackData);
}
if (aFlags & END_NO_COMPOSITE) {
// Apply pending tree updates before recomputing effective
// properties.
mRoot->ApplyPendingUpdatesToSubtree();
}
}
if (mTarget && mRoot &&
!(aFlags & END_NO_IMMEDIATE_REDRAW) &&
!(aFlags & END_NO_COMPOSITE)) {
nsIntRect clipRect;
{
gfxContextMatrixAutoSaveRestore save(mTarget);
mTarget->SetMatrix(gfxMatrix());
clipRect = ToOutsideIntRect(mTarget->GetClipExtents());
}
if (IsRetained()) {
nsIntRegion region;
MarkLayersHidden(mRoot, clipRect, clipRect, region, ALLOW_OPAQUE);
if (mUsingDefaultTarget && mDoubleBuffering != BUFFER_NONE) {
ApplyDoubleBuffering(mRoot, clipRect);
}
}
PaintLayer(mTarget, mRoot, aCallback, aCallbackData, nullptr);
if (mWidget) {
FlashWidgetUpdateArea(mTarget);
}
RenderDebugOverlay();
LayerManager::PostPresent();
if (!mTransactionIncomplete) {
// Clear out target if we have a complete transaction.
mTarget = nullptr;
}
}
#ifdef MOZ_LAYERS_HAVE_LOG
Log();
MOZ_LAYERS_LOG(("]----- EndTransaction"));
#endif
// Go back to the construction phase if the transaction isn't complete.
// Layout will update the layer tree and call EndTransaction().
mPhase = mTransactionIncomplete ? PHASE_CONSTRUCTION : PHASE_NONE;
if (!mTransactionIncomplete) {
// This is still valid if the transaction was incomplete.
mUsingDefaultTarget = false;
}
NS_ASSERTION(!aCallback || !mTransactionIncomplete,
"If callback is not null, transaction must be complete");
// XXX - We should probably assert here that for an incomplete transaction
// out target is the default target.
return !mTransactionIncomplete;
}
void
BasicLayerManager::FlashWidgetUpdateArea(gfxContext *aContext)
{
if (gfxPlatform::GetPlatform()->WidgetUpdateFlashing()) {
float r = float(rand()) / RAND_MAX;
float g = float(rand()) / RAND_MAX;
float b = float(rand()) / RAND_MAX;
aContext->SetColor(gfxRGBA(r, g, b, 0.2));
aContext->Paint();
}
}
bool
BasicLayerManager::EndEmptyTransaction(EndTransactionFlags aFlags)
{
mInTransaction = false;
if (!mRoot) {
return false;
}
return EndTransactionInternal(nullptr, nullptr, aFlags);
}
void
BasicLayerManager::SetRoot(Layer* aLayer)
{
NS_ASSERTION(aLayer, "Root can't be null");
NS_ASSERTION(aLayer->Manager() == this, "Wrong manager");
NS_ASSERTION(InConstruction(), "Only allowed in construction phase");
mRoot = aLayer;
}
static pixman_transform
BasicLayerManager_Matrix3DToPixman(const gfx3DMatrix& aMatrix)
{
pixman_f_transform transform;
transform.m[0][0] = aMatrix._11;
transform.m[0][1] = aMatrix._21;
transform.m[0][2] = aMatrix._41;
transform.m[1][0] = aMatrix._12;
transform.m[1][1] = aMatrix._22;
transform.m[1][2] = aMatrix._42;
transform.m[2][0] = aMatrix._14;
transform.m[2][1] = aMatrix._24;
transform.m[2][2] = aMatrix._44;
pixman_transform result;
pixman_transform_from_pixman_f_transform(&result, &transform);
return result;
}
static void
PixmanTransform(const gfxImageSurface* aDest,
RefPtr<DataSourceSurface> aSrc,
const gfx3DMatrix& aTransform,
gfxPoint aDestOffset)
{
gfxIntSize destSize = aDest->GetSize();
pixman_image_t* dest = pixman_image_create_bits(aDest->Format() == gfxImageFormatARGB32 ? PIXMAN_a8r8g8b8 : PIXMAN_x8r8g8b8,
destSize.width,
destSize.height,
(uint32_t*)aDest->Data(),
aDest->Stride());
IntSize srcSize = aSrc->GetSize();
pixman_image_t* src = pixman_image_create_bits(aSrc->GetFormat() == FORMAT_B8G8R8A8 ? PIXMAN_a8r8g8b8 : PIXMAN_x8r8g8b8,
srcSize.width,
srcSize.height,
(uint32_t*)aSrc->GetData(),
aSrc->Stride());
NS_ABORT_IF_FALSE(src && dest, "Failed to create pixman images?");
pixman_transform pixTransform = BasicLayerManager_Matrix3DToPixman(aTransform);
pixman_transform pixTransformInverted;
// If the transform is singular then nothing would be drawn anyway, return here
if (!pixman_transform_invert(&pixTransformInverted, &pixTransform)) {
return;
}
pixman_image_set_transform(src, &pixTransformInverted);
pixman_image_composite32(PIXMAN_OP_SRC,
src,
nullptr,
dest,
aDestOffset.x,
aDestOffset.y,
0,
0,
0,
0,
destSize.width,
destSize.height);
pixman_image_unref(dest);
pixman_image_unref(src);
}
/**
* Transform a surface using a gfx3DMatrix and blit to the destination if
* it is efficient to do so.
*
* @param aSource Source surface.
* @param aDest Desintation context.
* @param aBounds Area represented by aSource.
* @param aTransform Transformation matrix.
* @param aDestRect Output: rectangle in which to draw returned surface on aDest
* (same size as aDest). Only filled in if this returns
* a surface.
* @return Transformed surface
*/
static already_AddRefed<gfxASurface>
Transform3D(RefPtr<SourceSurface> aSource,
gfxContext* aDest,
const gfxRect& aBounds,
const gfx3DMatrix& aTransform,
gfxRect& aDestRect)
{
// Find the transformed rectangle of our layer.
gfxRect offsetRect = aTransform.TransformBounds(aBounds);
// Intersect the transformed layer with the destination rectangle.
// This is in device space since we have an identity transform set on aTarget.
aDestRect = aDest->GetClipExtents();
aDestRect.IntersectRect(aDestRect, offsetRect);
aDestRect.RoundOut();
// Create a surface the size of the transformed object.
nsRefPtr<gfxASurface> dest = aDest->CurrentSurface();
nsRefPtr<gfxImageSurface> destImage = new gfxImageSurface(gfxIntSize(aDestRect.width,
aDestRect.height),
gfxImageFormatARGB32);
gfxPoint offset = aDestRect.TopLeft();
// Include a translation to the correct origin.
gfx3DMatrix translation = gfx3DMatrix::Translation(aBounds.x, aBounds.y, 0);
// Transform the content and offset it such that the content begins at the origin.
PixmanTransform(destImage, aSource->GetDataSurface(), translation * aTransform, offset);
// If we haven't actually drawn to aDest then return our temporary image so
// that the caller can do this.
return destImage.forget();
}
void
BasicLayerManager::PaintSelfOrChildren(PaintLayerContext& aPaintContext,
gfxContext* aGroupTarget)
{
BasicImplData* data = ToData(aPaintContext.mLayer);
/* Only paint ourself, or our children - This optimization relies on this! */
Layer* child = aPaintContext.mLayer->GetFirstChild();
if (!child) {
if (aPaintContext.mLayer->AsThebesLayer()) {
data->PaintThebes(aGroupTarget, aPaintContext.mLayer->GetMaskLayer(),
aPaintContext.mCallback, aPaintContext.mCallbackData,
aPaintContext.mReadback);
} else {
data->Paint(aGroupTarget, aPaintContext.mLayer->GetMaskLayer());
}
} else {
ReadbackProcessor readback;
ContainerLayer* container =
static_cast<ContainerLayer*>(aPaintContext.mLayer);
if (IsRetained()) {
readback.BuildUpdates(container);
}
nsAutoTArray<Layer*, 12> children;
container->SortChildrenBy3DZOrder(children);
for (uint32_t i = 0; i < children.Length(); i++) {
PaintLayer(aGroupTarget, children.ElementAt(i), aPaintContext.mCallback,
aPaintContext.mCallbackData, &readback);
if (mTransactionIncomplete)
break;
}
}
}
void
BasicLayerManager::FlushGroup(PaintLayerContext& aPaintContext, bool aNeedsClipToVisibleRegion)
{
// If we're doing our own double-buffering, we need to avoid drawing
// the results of an incomplete transaction to the destination surface ---
// that could cause flicker. Double-buffering is implemented using a
// temporary surface for one or more container layers, so we need to stop
// those temporary surfaces from being composited to aTarget.
// ApplyDoubleBuffering guarantees that this container layer can't
// intersect any other leaf layers, so if the transaction is not yet marked
// incomplete, the contents of this container layer are the final contents
// for the window.
if (!mTransactionIncomplete) {
if (aNeedsClipToVisibleRegion) {
gfxUtils::ClipToRegion(aPaintContext.mTarget,
aPaintContext.mLayer->GetEffectiveVisibleRegion());
}
BasicContainerLayer* container = static_cast<BasicContainerLayer*>(aPaintContext.mLayer);
AutoSetOperator setOperator(aPaintContext.mTarget, container->GetOperator());
PaintWithMask(aPaintContext.mTarget, aPaintContext.mLayer->GetEffectiveOpacity(),
aPaintContext.mLayer->GetMaskLayer());
}
}
void
BasicLayerManager::PaintLayer(gfxContext* aTarget,
Layer* aLayer,
DrawThebesLayerCallback aCallback,
void* aCallbackData,
ReadbackProcessor* aReadback)
{
PROFILER_LABEL("BasicLayerManager", "PaintLayer");
PaintLayerContext paintLayerContext(aTarget, aLayer, aCallback, aCallbackData, aReadback);
// Don't attempt to paint layers with a singular transform, cairo will
// just throw an error.
if (aLayer->GetEffectiveTransform().IsSingular()) {
return;
}
RenderTraceScope trace("BasicLayerManager::PaintLayer", "707070");
const nsIntRect* clipRect = aLayer->GetEffectiveClipRect();
// aLayer might not be a container layer, but if so we take care not to use
// the container variable
BasicContainerLayer* container = static_cast<BasicContainerLayer*>(aLayer);
bool needsGroup = aLayer->GetFirstChild() &&
container->UseIntermediateSurface();
BasicImplData* data = ToData(aLayer);
bool needsClipToVisibleRegion =
data->GetClipToVisibleRegion() && !aLayer->AsThebesLayer();
NS_ASSERTION(needsGroup || !aLayer->GetFirstChild() ||
container->GetOperator() == gfxContext::OPERATOR_OVER,
"non-OVER operator should have forced UseIntermediateSurface");
NS_ASSERTION(!aLayer->GetFirstChild() || !aLayer->GetMaskLayer() ||
container->UseIntermediateSurface(),
"ContainerLayer with mask layer should force UseIntermediateSurface");
gfxContextAutoSaveRestore contextSR;
gfxMatrix transform;
// Will return an identity matrix for 3d transforms, and is handled separately below.
bool is2D = paintLayerContext.Setup2DTransform();
NS_ABORT_IF_FALSE(is2D || needsGroup || !aLayer->GetFirstChild(), "Must PushGroup for 3d transforms!");
bool needsSaveRestore =
needsGroup || clipRect || needsClipToVisibleRegion || !is2D;
if (needsSaveRestore) {
contextSR.SetContext(aTarget);
if (clipRect) {
aTarget->NewPath();
aTarget->SnappedRectangle(gfxRect(clipRect->x, clipRect->y, clipRect->width, clipRect->height));
aTarget->Clip();
}
}
paintLayerContext.Apply2DTransform();
const nsIntRegion& visibleRegion = aLayer->GetEffectiveVisibleRegion();
// If needsGroup is true, we'll clip to the visible region after we've popped the group
if (needsClipToVisibleRegion && !needsGroup) {
gfxUtils::ClipToRegion(aTarget, visibleRegion);
// Don't need to clip to visible region again
needsClipToVisibleRegion = false;
}
if (is2D) {
paintLayerContext.AnnotateOpaqueRect();
}
bool clipIsEmpty = !aTarget || aTarget->GetClipExtents().IsEmpty();
if (clipIsEmpty) {
PaintSelfOrChildren(paintLayerContext, aTarget);
return;
}
if (is2D) {
if (needsGroup) {
nsRefPtr<gfxContext> groupTarget = PushGroupForLayer(aTarget, aLayer, aLayer->GetEffectiveVisibleRegion(),
&needsClipToVisibleRegion);
PaintSelfOrChildren(paintLayerContext, groupTarget);
PopGroupToSourceWithCachedSurface(aTarget, groupTarget);
FlushGroup(paintLayerContext, needsClipToVisibleRegion);
} else {
PaintSelfOrChildren(paintLayerContext, aTarget);
}
} else {
const nsIntRect& bounds = visibleRegion.GetBounds();
RefPtr<DrawTarget> untransformedDT =
gfxPlatform::GetPlatform()->CreateOffscreenContentDrawTarget(IntSize(bounds.width, bounds.height),
FORMAT_B8G8R8A8);
if (!untransformedDT) {
return;
}
nsRefPtr<gfxContext> groupTarget = new gfxContext(untransformedDT);
groupTarget->Translate(gfxPoint(-bounds.x, -bounds.y));
PaintSelfOrChildren(paintLayerContext, groupTarget);
// Temporary fast fix for bug 725886
// Revert these changes when 725886 is ready
NS_ABORT_IF_FALSE(untransformedDT,
"We should always allocate an untransformed surface with 3d transforms!");
gfxRect destRect;
#ifdef DEBUG
if (aLayer->GetDebugColorIndex() != 0) {
gfxRGBA color((aLayer->GetDebugColorIndex() & 1) ? 1.0 : 0.0,
(aLayer->GetDebugColorIndex() & 2) ? 1.0 : 0.0,
(aLayer->GetDebugColorIndex() & 4) ? 1.0 : 0.0,
1.0);
nsRefPtr<gfxContext> temp = new gfxContext(untransformedDT);
temp->Translate(gfxPoint(-bounds.x, -bounds.y));
temp->SetColor(color);
temp->Paint();
}
#endif
const gfx3DMatrix& effectiveTransform = aLayer->GetEffectiveTransform();
nsRefPtr<gfxASurface> result =
Transform3D(untransformedDT->Snapshot(), aTarget, bounds,
effectiveTransform, destRect);
if (result) {
aTarget->SetSource(result, destRect.TopLeft());
// Azure doesn't support EXTEND_NONE, so to avoid extending the edges
// of the source surface out to the current clip region, clip to
// the rectangle of the result surface now.
aTarget->NewPath();
aTarget->SnappedRectangle(destRect);
aTarget->Clip();
FlushGroup(paintLayerContext, needsClipToVisibleRegion);
}
}
}
void
BasicLayerManager::ClearCachedResources(Layer* aSubtree)
{
MOZ_ASSERT(!aSubtree || aSubtree->Manager() == this);
if (aSubtree) {
ClearLayer(aSubtree);
} else if (mRoot) {
ClearLayer(mRoot);
}
mCachedSurface.Expire();
}
void
BasicLayerManager::ClearLayer(Layer* aLayer)
{
ToData(aLayer)->ClearCachedResources();
for (Layer* child = aLayer->GetFirstChild(); child;
child = child->GetNextSibling()) {
ClearLayer(child);
}
}
already_AddRefed<ReadbackLayer>
BasicLayerManager::CreateReadbackLayer()
{
NS_ASSERTION(InConstruction(), "Only allowed in construction phase");
nsRefPtr<ReadbackLayer> layer = new BasicReadbackLayer(this);
return layer.forget();
}
}
}
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