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gfx/layers/composite/CanvasLayerComposite.cpp@97036ab72558 (annotated)

gfx/layers/composite/CanvasLayerComposite.cpp

Tue, 06 Jan 2015 21:39:09 +0100

author

Michael Schloh von Bennewitz <michael@schloh.com>

date

Tue, 06 Jan 2015 21:39:09 +0100

branch

TOR_BUG_9701

changeset 8

97036ab72558

permissions

-rw-r--r--

Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.

michael@0	1	/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
michael@0	2	/* This Source Code Form is subject to the terms of the Mozilla Public
michael@0	3	* License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0	4	* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0	5
michael@0	6	#include "CanvasLayerComposite.h"
michael@0	7	#include "composite/CompositableHost.h" // for CompositableHost
michael@0	8	#include "gfx2DGlue.h" // for ToFilter, ToMatrix4x4
michael@0	9	#include "GraphicsFilter.h" // for GraphicsFilter
michael@0	10	#include "gfxUtils.h" // for gfxUtils, etc
michael@0	11	#include "mozilla/gfx/Matrix.h" // for Matrix4x4
michael@0	12	#include "mozilla/gfx/Point.h" // for Point
michael@0	13	#include "mozilla/gfx/Rect.h" // for Rect
michael@0	14	#include "mozilla/layers/Compositor.h" // for Compositor
michael@0	15	#include "mozilla/layers/Effects.h" // for EffectChain
michael@0	16	#include "mozilla/mozalloc.h" // for operator delete
michael@0	17	#include "nsAString.h"
michael@0	18	#include "nsAutoPtr.h" // for nsRefPtr
michael@0	19	#include "nsISupportsImpl.h" // for MOZ_COUNT_CTOR, etc
michael@0	20	#include "nsPoint.h" // for nsIntPoint
michael@0	21	#include "nsString.h" // for nsAutoCString
michael@0	22
michael@0	23	using namespace mozilla;
michael@0	24	using namespace mozilla::layers;
michael@0	25	using namespace mozilla::gfx;
michael@0	26
michael@0	27	CanvasLayerComposite::CanvasLayerComposite(LayerManagerComposite* aManager)
michael@0	28	: CanvasLayer(aManager, nullptr)
michael@0	29	, LayerComposite(aManager)
michael@0	30	, mImageHost(nullptr)
michael@0	31	{
michael@0	32	MOZ_COUNT_CTOR(CanvasLayerComposite);
michael@0	33	mImplData = static_cast<LayerComposite*>(this);
michael@0	34	}
michael@0	35
michael@0	36	CanvasLayerComposite::~CanvasLayerComposite()
michael@0	37	{
michael@0	38	MOZ_COUNT_DTOR(CanvasLayerComposite);
michael@0	39
michael@0	40	CleanupResources();
michael@0	41	}
michael@0	42
michael@0	43	bool
michael@0	44	CanvasLayerComposite::SetCompositableHost(CompositableHost* aHost)
michael@0	45	{
michael@0	46	switch (aHost->GetType()) {
michael@0	47	case BUFFER_IMAGE_SINGLE:
michael@0	48	case BUFFER_IMAGE_BUFFERED:
michael@0	49	case COMPOSITABLE_IMAGE:
michael@0	50	mImageHost = aHost;
michael@0	51	return true;
michael@0	52	default:
michael@0	53	return false;
michael@0	54	}
michael@0	55
michael@0	56	}
michael@0	57
michael@0	58	Layer*
michael@0	59	CanvasLayerComposite::GetLayer()
michael@0	60	{
michael@0	61	return this;
michael@0	62	}
michael@0	63
michael@0	64	LayerRenderState
michael@0	65	CanvasLayerComposite::GetRenderState()
michael@0	66	{
michael@0	67	if (mDestroyed || !mImageHost || !mImageHost->IsAttached()) {
michael@0	68	return LayerRenderState();
michael@0	69	}
michael@0	70	return mImageHost->GetRenderState();
michael@0	71	}
michael@0	72
michael@0	73	void
michael@0	74	CanvasLayerComposite::RenderLayer(const nsIntRect& aClipRect)
michael@0	75	{
michael@0	76	if (!mImageHost || !mImageHost->IsAttached()) {
michael@0	77	return;
michael@0	78	}
michael@0	79
michael@0	80	mCompositor->MakeCurrent();
michael@0	81
michael@0	82	#ifdef MOZ_DUMP_PAINTING
michael@0	83	if (gfxUtils::sDumpPainting) {
michael@0	84	RefPtr<gfx::DataSourceSurface> surf = mImageHost->GetAsSurface();
michael@0	85	WriteSnapshotToDumpFile(this, surf);
michael@0	86	}
michael@0	87	#endif
michael@0	88
michael@0	89	GraphicsFilter filter = mFilter;
michael@0	90	#ifdef ANDROID
michael@0	91	// Bug 691354
michael@0	92	// Using the LINEAR filter we get unexplained artifacts.
michael@0	93	// Use NEAREST when no scaling is required.
michael@0	94	Matrix matrix;
michael@0	95	bool is2D = GetEffectiveTransform().Is2D(&matrix);
michael@0	96	if (is2D && !ThebesMatrix(matrix).HasNonTranslationOrFlip()) {
michael@0	97	filter = GraphicsFilter::FILTER_NEAREST;
michael@0	98	}
michael@0	99	#endif
michael@0	100
michael@0	101	EffectChain effectChain(this);
michael@0	102
michael@0	103	LayerManagerComposite::AutoAddMaskEffect autoMaskEffect(mMaskLayer, effectChain);
michael@0	104	gfx::Rect clipRect(aClipRect.x, aClipRect.y, aClipRect.width, aClipRect.height);
michael@0	105
michael@0	106	mImageHost->Composite(effectChain,
michael@0	107	GetEffectiveOpacity(),
michael@0	108	GetEffectiveTransform(),
michael@0	109	gfx::ToFilter(filter),
michael@0	110	clipRect);
michael@0	111	mImageHost->BumpFlashCounter();
michael@0	112	}
michael@0	113
michael@0	114	CompositableHost*
michael@0	115	CanvasLayerComposite::GetCompositableHost()
michael@0	116	{
michael@0	117	if ( mImageHost && mImageHost->IsAttached()) {
michael@0	118	return mImageHost.get();
michael@0	119	}
michael@0	120
michael@0	121	return nullptr;
michael@0	122	}
michael@0	123
michael@0	124	void
michael@0	125	CanvasLayerComposite::CleanupResources()
michael@0	126	{
michael@0	127	if (mImageHost) {
michael@0	128	mImageHost->Detach(this);
michael@0	129	}
michael@0	130	mImageHost = nullptr;
michael@0	131	}
michael@0	132
michael@0	133	nsACString&
michael@0	134	CanvasLayerComposite::PrintInfo(nsACString& aTo, const char* aPrefix)
michael@0	135	{
michael@0	136	CanvasLayer::PrintInfo(aTo, aPrefix);
michael@0	137	aTo += "\n";
michael@0	138	if (mImageHost && mImageHost->IsAttached()) {
michael@0	139	nsAutoCString pfx(aPrefix);
michael@0	140	pfx += " ";
michael@0	141	mImageHost->PrintInfo(aTo, pfx.get());
michael@0	142	}
michael@0	143	return aTo;
michael@0	144	}
michael@0	145