gecko/gfx/layers/composite/ThebesLayerComposite.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 "ThebesLayerComposite.h"
#include "mozilla-config.h" // for MOZ_DUMP_PAINTING
#include "CompositableHost.h" // for TiledLayerProperties, etc
#include "FrameMetrics.h" // for FrameMetrics
#include "Units.h" // for CSSRect, LayerPixel, etc
#include "gfx2DGlue.h" // for ToMatrix4x4
#include "gfx3DMatrix.h" // for gfx3DMatrix
#include "gfxImageSurface.h" // for gfxImageSurface
#include "gfxUtils.h" // for gfxUtils, etc
#include "mozilla/Assertions.h" // for MOZ_ASSERT, etc
#include "mozilla/gfx/Matrix.h" // for Matrix4x4
#include "mozilla/gfx/Point.h" // for Point
#include "mozilla/gfx/Rect.h" // for RoundedToInt, Rect
#include "mozilla/gfx/Types.h" // for Filter::FILTER_LINEAR
#include "mozilla/layers/Compositor.h" // for Compositor
#include "mozilla/layers/ContentHost.h" // for ContentHost
#include "mozilla/layers/Effects.h" // for EffectChain
#include "mozilla/mozalloc.h" // for operator delete
#include "nsAString.h"
#include "nsAutoPtr.h" // for nsRefPtr
#include "nsMathUtils.h" // for NS_lround
#include "nsPoint.h" // for nsIntPoint
#include "nsRect.h" // for nsIntRect
#include "nsSize.h" // for nsIntSize
#include "nsString.h" // for nsAutoCString
#include "nsTraceRefcnt.h" // for MOZ_COUNT_CTOR, etc
namespace mozilla {
namespace layers {
class TiledLayerComposer;
ThebesLayerComposite::ThebesLayerComposite(LayerManagerComposite *aManager)
: ThebesLayer(aManager, nullptr)
, LayerComposite(aManager)
, mBuffer(nullptr)
, mRequiresTiledProperties(false)
{
MOZ_COUNT_CTOR(ThebesLayerComposite);
mImplData = static_cast<LayerComposite*>(this);
}
ThebesLayerComposite::~ThebesLayerComposite()
{
MOZ_COUNT_DTOR(ThebesLayerComposite);
CleanupResources();
}
void
ThebesLayerComposite::SetCompositableHost(CompositableHost* aHost)
{
mBuffer = static_cast<ContentHost*>(aHost);
}
void
ThebesLayerComposite::Disconnect()
{
Destroy();
}
void
ThebesLayerComposite::Destroy()
{
if (!mDestroyed) {
CleanupResources();
mDestroyed = true;
}
}
Layer*
ThebesLayerComposite::GetLayer()
{
return this;
}
TiledLayerComposer*
ThebesLayerComposite::GetTiledLayerComposer()
{
MOZ_ASSERT(mBuffer && mBuffer->IsAttached());
return mBuffer->AsTiledLayerComposer();
}
LayerRenderState
ThebesLayerComposite::GetRenderState()
{
if (!mBuffer || !mBuffer->IsAttached() || mDestroyed) {
return LayerRenderState();
}
return mBuffer->GetRenderState();
}
void
ThebesLayerComposite::RenderLayer(const nsIntPoint& aOffset,
const nsIntRect& aClipRect)
{
if (!mBuffer || !mBuffer->IsAttached()) {
return;
}
MOZ_ASSERT(mBuffer->GetCompositor() == mCompositeManager->GetCompositor() &&
mBuffer->GetLayer() == this,
"buffer is corrupted");
gfx::Matrix4x4 transform;
ToMatrix4x4(GetEffectiveTransform(), transform);
gfx::Rect clipRect(aClipRect.x, aClipRect.y, aClipRect.width, aClipRect.height);
#ifdef MOZ_DUMP_PAINTING
if (gfxUtils::sDumpPainting) {
nsRefPtr<gfxImageSurface> surf = mBuffer->GetAsSurface();
WriteSnapshotToDumpFile(this, surf);
}
#endif
EffectChain effectChain;
LayerManagerComposite::AddMaskEffect(mMaskLayer, effectChain);
nsIntRegion visibleRegion = GetEffectiveVisibleRegion();
TiledLayerProperties tiledLayerProps;
if (mRequiresTiledProperties) {
// calculating these things can be a little expensive, so don't
// do them if we don't have to
tiledLayerProps.mVisibleRegion = visibleRegion;
tiledLayerProps.mDisplayPort = GetDisplayPort();
tiledLayerProps.mEffectiveResolution = GetEffectiveResolution();
tiledLayerProps.mCompositionBounds = GetCompositionBounds();
tiledLayerProps.mRetainTiles = !mIsFixedPosition;
tiledLayerProps.mValidRegion = mValidRegion;
}
mBuffer->SetPaintWillResample(MayResample());
mBuffer->Composite(effectChain,
GetEffectiveOpacity(),
transform,
gfx::Point(aOffset.x, aOffset.y),
gfx::FILTER_LINEAR,
clipRect,
&visibleRegion,
mRequiresTiledProperties ? &tiledLayerProps
: nullptr);
if (mRequiresTiledProperties) {
mValidRegion = tiledLayerProps.mValidRegion;
}
LayerManagerComposite::RemoveMaskEffect(mMaskLayer);
mCompositeManager->GetCompositor()->MakeCurrent();
}
CompositableHost*
ThebesLayerComposite::GetCompositableHost()
{
if (mBuffer->IsAttached()) {
return mBuffer.get();
}
return nullptr;
}
void
ThebesLayerComposite::CleanupResources()
{
if (mBuffer) {
mBuffer->Detach();
}
mBuffer = nullptr;
}
gfxSize
ThebesLayerComposite::GetEffectiveResolution()
{
// Work out render resolution by multiplying the resolution of our ancestors.
// Only container layers can have frame metrics, so we start off with a
// resolution of 1, 1.
// XXX For large layer trees, it would be faster to do this once from the
// root node upwards and store the value on each layer.
gfxSize resolution(1, 1);
for (ContainerLayer* parent = GetParent(); parent; parent = parent->GetParent()) {
const FrameMetrics& metrics = parent->GetFrameMetrics();
resolution.width *= metrics.mResolution.scale;
resolution.height *= metrics.mResolution.scale;
}
return resolution;
}
gfxRect
ThebesLayerComposite::GetDisplayPort()
{
// We use GetTransform instead of GetEffectiveTransform in this function
// as we want the transform of the shadowable layers and not that of the
// shadow layers, which may have been modified due to async scrolling/
// zooming.
gfx3DMatrix transform = GetTransform();
// Find out the area of the nearest display-port to invalidate retained
// tiles.
gfxRect displayPort;
gfxSize parentResolution = GetEffectiveResolution();
for (ContainerLayer* parent = GetParent(); parent; parent = parent->GetParent()) {
const FrameMetrics& metrics = parent->GetFrameMetrics();
if (displayPort.IsEmpty()) {
if (!metrics.mDisplayPort.IsEmpty()) {
// We use the bounds to cut down on complication/computation time.
// This will be incorrect when the transform involves rotation, but
// it'd be quite hard to retain invalid tiles correctly in this
// situation anyway.
displayPort = gfxRect(metrics.mDisplayPort.x,
metrics.mDisplayPort.y,
metrics.mDisplayPort.width,
metrics.mDisplayPort.height);
displayPort.ScaleRoundOut(parentResolution.width, parentResolution.height);
}
parentResolution.width /= metrics.mResolution.scale;
parentResolution.height /= metrics.mResolution.scale;
}
if (parent->UseIntermediateSurface()) {
transform.PreMultiply(parent->GetTransform());
}
}
// If no display port was found, use the widget size from the layer manager.
if (displayPort.IsEmpty()) {
LayerManagerComposite* manager = static_cast<LayerManagerComposite*>(Manager());
const nsIntSize& widgetSize = manager->GetWidgetSize();
displayPort.width = widgetSize.width;
displayPort.height = widgetSize.height;
}
// Transform the display port into layer space.
displayPort = transform.Inverse().TransformBounds(displayPort);
return displayPort;
}
gfxRect
ThebesLayerComposite::GetCompositionBounds()
{
// Walk up the tree, looking for a display-port - if we find one, we know
// that this layer represents a content node and we can use its first
// scrollable child, in conjunction with its content area and viewport offset
// to establish the screen coordinates to which the content area will be
// rendered.
gfxRect compositionBounds;
ContainerLayer* scrollableLayer = nullptr;
for (ContainerLayer* parent = GetParent(); parent; parent = parent->GetParent()) {
const FrameMetrics& parentMetrics = parent->GetFrameMetrics();
if (parentMetrics.IsScrollable())
scrollableLayer = parent;
if (!parentMetrics.mDisplayPort.IsEmpty() && scrollableLayer) {
// Get the composition bounds, so as not to waste rendering time.
compositionBounds = gfxRect(parentMetrics.mCompositionBounds.x,
parentMetrics.mCompositionBounds.y,
parentMetrics.mCompositionBounds.width,
parentMetrics.mCompositionBounds.height);
// Calculate the scale transform applied to the root layer to determine
// the content resolution.
Layer* rootLayer = Manager()->GetRoot();
const gfx3DMatrix& rootTransform = rootLayer->GetTransform();
LayerToCSSScale scale(rootTransform.GetXScale(),
rootTransform.GetYScale());
// Get the content document bounds, in screen-space.
const FrameMetrics& metrics = scrollableLayer->GetFrameMetrics();
const LayerIntRect content = RoundedToInt(metrics.mScrollableRect / scale);
// !!! WTF. this code is just wrong. See bug 881451.
gfx::Point scrollOffset =
gfx::Point((metrics.mScrollOffset.x * metrics.LayersPixelsPerCSSPixel().scale) / scale.scale,
(metrics.mScrollOffset.y * metrics.LayersPixelsPerCSSPixel().scale) / scale.scale);
const nsIntPoint contentOrigin(
content.x - NS_lround(scrollOffset.x),
content.y - NS_lround(scrollOffset.y));
gfxRect contentRect = gfxRect(contentOrigin.x, contentOrigin.y,
content.width, content.height);
gfxRect contentBounds = scrollableLayer->GetEffectiveTransform().
TransformBounds(contentRect);
// Clip the composition bounds to the content bounds
compositionBounds.IntersectRect(compositionBounds, contentBounds);
break;
}
}
return compositionBounds;
}
#ifdef MOZ_LAYERS_HAVE_LOG
nsACString&
ThebesLayerComposite::PrintInfo(nsACString& aTo, const char* aPrefix)
{
ThebesLayer::PrintInfo(aTo, aPrefix);
aTo += "\n";
if (mBuffer && mBuffer->IsAttached()) {
nsAutoCString pfx(aPrefix);
pfx += " ";
mBuffer->PrintInfo(aTo, pfx.get());
}
return aTo;
}
#endif
} /* layers */
} /* mozilla */