From 36d22d82aa202bb199967e9512281e9a53db42c9 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 21:33:14 +0200 Subject: Adding upstream version 115.7.0esr. Signed-off-by: Daniel Baumann --- dom/canvas/CanvasImageCache.cpp | 397 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 397 insertions(+) create mode 100644 dom/canvas/CanvasImageCache.cpp (limited to 'dom/canvas/CanvasImageCache.cpp') diff --git a/dom/canvas/CanvasImageCache.cpp b/dom/canvas/CanvasImageCache.cpp new file mode 100644 index 0000000000..96a1505a40 --- /dev/null +++ b/dom/canvas/CanvasImageCache.cpp @@ -0,0 +1,397 @@ +/* -*- 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 "CanvasImageCache.h" +#include "nsIImageLoadingContent.h" +#include "nsExpirationTracker.h" +#include "imgIRequest.h" +#include "mozilla/dom/Element.h" +#include "nsTHashtable.h" +#include "mozilla/dom/HTMLCanvasElement.h" +#include "nsContentUtils.h" +#include "mozilla/Preferences.h" +#include "mozilla/StaticPrefs_canvas.h" +#include "mozilla/UniquePtr.h" +#include "mozilla/gfx/2D.h" +#include "gfx2DGlue.h" + +namespace mozilla { + +using namespace dom; +using namespace gfx; + +/** + * Used for images specific to this one canvas. Required + * due to CORS security. + */ +struct ImageCacheKey { + ImageCacheKey(imgIContainer* aImage, HTMLCanvasElement* aCanvas, + BackendType aBackendType) + : mImage(aImage), mCanvas(aCanvas), mBackendType(aBackendType) {} + nsCOMPtr mImage; + HTMLCanvasElement* mCanvas; + BackendType mBackendType; +}; + +/** + * Cache data needs to be separate from the entry + * for nsExpirationTracker. + */ +struct ImageCacheEntryData { + ImageCacheEntryData(const ImageCacheEntryData& aOther) + : mImage(aOther.mImage), + mCanvas(aOther.mCanvas), + mBackendType(aOther.mBackendType), + mSourceSurface(aOther.mSourceSurface), + mSize(aOther.mSize), + mIntrinsicSize(aOther.mIntrinsicSize) {} + explicit ImageCacheEntryData(const ImageCacheKey& aKey) + : mImage(aKey.mImage), + mCanvas(aKey.mCanvas), + mBackendType(aKey.mBackendType) {} + + nsExpirationState* GetExpirationState() { return &mState; } + size_t SizeInBytes() { return mSize.width * mSize.height * 4; } + + // Key + nsCOMPtr mImage; + HTMLCanvasElement* mCanvas; + BackendType mBackendType; + // Value + RefPtr mSourceSurface; + IntSize mSize; + IntSize mIntrinsicSize; + nsExpirationState mState; +}; + +class ImageCacheEntry : public PLDHashEntryHdr { + public: + using KeyType = ImageCacheKey; + using KeyTypePointer = const ImageCacheKey*; + + explicit ImageCacheEntry(const KeyType* aKey) + : mData(new ImageCacheEntryData(*aKey)) {} + ImageCacheEntry(const ImageCacheEntry& toCopy) + : mData(new ImageCacheEntryData(*toCopy.mData)) {} + ~ImageCacheEntry() = default; + + bool KeyEquals(KeyTypePointer key) const { + return mData->mImage == key->mImage && mData->mCanvas == key->mCanvas && + mData->mBackendType == key->mBackendType; + } + + static KeyTypePointer KeyToPointer(KeyType& key) { return &key; } + static PLDHashNumber HashKey(KeyTypePointer key) { + return HashGeneric(key->mImage.get(), key->mCanvas, key->mBackendType); + } + enum { ALLOW_MEMMOVE = true }; + + UniquePtr mData; +}; + +/** + * Used for all images across all canvases. + */ +struct AllCanvasImageCacheKey { + explicit AllCanvasImageCacheKey(imgIContainer* aImage, + BackendType aBackendType) + : mImage(aImage), mBackendType(aBackendType) {} + + nsCOMPtr mImage; + BackendType mBackendType; +}; + +class AllCanvasImageCacheEntry : public PLDHashEntryHdr { + public: + using KeyType = AllCanvasImageCacheKey; + using KeyTypePointer = const AllCanvasImageCacheKey*; + + explicit AllCanvasImageCacheEntry(const KeyType* aKey) + : mImage(aKey->mImage), mBackendType(aKey->mBackendType) {} + + AllCanvasImageCacheEntry(const AllCanvasImageCacheEntry& toCopy) + : mImage(toCopy.mImage), + mSourceSurface(toCopy.mSourceSurface), + mBackendType(toCopy.mBackendType) {} + + ~AllCanvasImageCacheEntry() = default; + + bool KeyEquals(KeyTypePointer key) const { + return mImage == key->mImage && mBackendType == key->mBackendType; + } + + static KeyTypePointer KeyToPointer(KeyType& key) { return &key; } + static PLDHashNumber HashKey(KeyTypePointer key) { + return HashGeneric(key->mImage.get(), key->mBackendType); + } + enum { ALLOW_MEMMOVE = true }; + + nsCOMPtr mImage; + RefPtr mSourceSurface; + BackendType mBackendType; +}; + +class ImageCacheObserver; + +class ImageCache final : public nsExpirationTracker { + public: + // We use 3 generations of 1 second each to get a 2-3 seconds timeout. + enum { GENERATION_MS = 1000 }; + ImageCache(); + ~ImageCache(); + + virtual void NotifyExpired(ImageCacheEntryData* aObject) override { + mTotal -= aObject->SizeInBytes(); + RemoveObject(aObject); + + // Remove from the all canvas cache entry first since nsExpirationTracker + // will delete aObject. + mAllCanvasCache.RemoveEntry( + AllCanvasImageCacheKey(aObject->mImage, aObject->mBackendType)); + + // Deleting the entry will delete aObject since the entry owns aObject. + mCache.RemoveEntry(ImageCacheKey(aObject->mImage, aObject->mCanvas, + aObject->mBackendType)); + } + + nsTHashtable mCache; + nsTHashtable mAllCanvasCache; + size_t mTotal; + RefPtr mImageCacheObserver; +}; + +static ImageCache* gImageCache = nullptr; + +// Listen memory-pressure event for image cache purge. +class ImageCacheObserver final : public nsIObserver { + public: + NS_DECL_ISUPPORTS + + explicit ImageCacheObserver(ImageCache* aImageCache) + : mImageCache(aImageCache) { + RegisterObserverEvents(); + } + + void Destroy() { + UnregisterObserverEvents(); + mImageCache = nullptr; + } + + NS_IMETHOD Observe(nsISupports* aSubject, const char* aTopic, + const char16_t* aSomeData) override { + if (!mImageCache || (strcmp(aTopic, "memory-pressure") != 0 && + strcmp(aTopic, "canvas-device-reset") != 0)) { + return NS_OK; + } + + mImageCache->AgeAllGenerations(); + return NS_OK; + } + + private: + virtual ~ImageCacheObserver() = default; + + void RegisterObserverEvents() { + nsCOMPtr observerService = + mozilla::services::GetObserverService(); + + MOZ_ASSERT(observerService); + + if (observerService) { + observerService->AddObserver(this, "memory-pressure", false); + observerService->AddObserver(this, "canvas-device-reset", false); + } + } + + void UnregisterObserverEvents() { + nsCOMPtr observerService = + mozilla::services::GetObserverService(); + + // Do not assert on observerService here. This might be triggered by + // the cycle collector at a late enough time, that XPCOM services are + // no longer available. See bug 1029504. + if (observerService) { + observerService->RemoveObserver(this, "memory-pressure"); + observerService->RemoveObserver(this, "canvas-device-reset"); + } + } + + ImageCache* mImageCache; +}; + +NS_IMPL_ISUPPORTS(ImageCacheObserver, nsIObserver) + +class CanvasImageCacheShutdownObserver final : public nsIObserver { + ~CanvasImageCacheShutdownObserver() = default; + + public: + NS_DECL_ISUPPORTS + NS_DECL_NSIOBSERVER +}; + +ImageCache::ImageCache() + : nsExpirationTracker(GENERATION_MS, "ImageCache"), + mTotal(0) { + mImageCacheObserver = new ImageCacheObserver(this); + MOZ_RELEASE_ASSERT(mImageCacheObserver, + "GFX: Can't alloc ImageCacheObserver"); +} + +ImageCache::~ImageCache() { + AgeAllGenerations(); + mImageCacheObserver->Destroy(); +} + +static already_AddRefed GetImageContainer(dom::Element* aImage) { + nsCOMPtr request; + nsCOMPtr ilc = do_QueryInterface(aImage); + if (!ilc) { + return nullptr; + } + + ilc->GetRequest(nsIImageLoadingContent::CURRENT_REQUEST, + getter_AddRefs(request)); + if (!request) { + return nullptr; + } + + nsCOMPtr imgContainer; + request->GetImage(getter_AddRefs(imgContainer)); + if (!imgContainer) { + return nullptr; + } + + return imgContainer.forget(); +} + +void CanvasImageCache::NotifyDrawImage(Element* aImage, + HTMLCanvasElement* aCanvas, + DrawTarget* aTarget, + SourceSurface* aSource, + const IntSize& aSize, + const IntSize& aIntrinsicSize) { + if (!aTarget) { + return; + } + + if (!gImageCache) { + gImageCache = new ImageCache(); + nsContentUtils::RegisterShutdownObserver( + new CanvasImageCacheShutdownObserver()); + } + + nsCOMPtr imgContainer = GetImageContainer(aImage); + if (!imgContainer) { + return; + } + + BackendType backendType = aTarget->GetBackendType(); + AllCanvasImageCacheKey allCanvasCacheKey(imgContainer, backendType); + ImageCacheKey canvasCacheKey(imgContainer, aCanvas, backendType); + ImageCacheEntry* entry = gImageCache->mCache.PutEntry(canvasCacheKey); + + if (entry) { + if (entry->mData->mSourceSurface) { + // We are overwriting an existing entry. + gImageCache->mTotal -= entry->mData->SizeInBytes(); + gImageCache->RemoveObject(entry->mData.get()); + gImageCache->mAllCanvasCache.RemoveEntry(allCanvasCacheKey); + } + + gImageCache->AddObject(entry->mData.get()); + entry->mData->mSourceSurface = aSource; + entry->mData->mSize = aSize; + entry->mData->mIntrinsicSize = aIntrinsicSize; + gImageCache->mTotal += entry->mData->SizeInBytes(); + + AllCanvasImageCacheEntry* allEntry = + gImageCache->mAllCanvasCache.PutEntry(allCanvasCacheKey); + if (allEntry) { + allEntry->mSourceSurface = aSource; + } + } + + if (!StaticPrefs::canvas_image_cache_limit()) { + return; + } + + // Expire the image cache early if its larger than we want it to be. + while (gImageCache->mTotal > + size_t(StaticPrefs::canvas_image_cache_limit())) { + gImageCache->AgeOneGeneration(); + } +} + +SourceSurface* CanvasImageCache::LookupAllCanvas(Element* aImage, + DrawTarget* aTarget) { + if (!gImageCache || !aTarget) { + return nullptr; + } + + nsCOMPtr imgContainer = GetImageContainer(aImage); + if (!imgContainer) { + return nullptr; + } + + AllCanvasImageCacheEntry* entry = gImageCache->mAllCanvasCache.GetEntry( + AllCanvasImageCacheKey(imgContainer, aTarget->GetBackendType())); + if (!entry) { + return nullptr; + } + + return entry->mSourceSurface; +} + +SourceSurface* CanvasImageCache::LookupCanvas(Element* aImage, + HTMLCanvasElement* aCanvas, + DrawTarget* aTarget, + IntSize* aSizeOut, + IntSize* aIntrinsicSizeOut) { + if (!gImageCache || !aTarget) { + return nullptr; + } + + nsCOMPtr imgContainer = GetImageContainer(aImage); + if (!imgContainer) { + return nullptr; + } + + // We filter based on the backend type because we don't want a surface that + // was optimized for one backend to be preferred for another backend, as this + // could have performance implications. For example, a Skia optimized surface + // given to a D2D backend would cause an upload each time, and similarly a D2D + // optimized surface given to a Skia backend would cause a readback. For + // details, see bug 1794442. + ImageCacheEntry* entry = gImageCache->mCache.GetEntry( + ImageCacheKey(imgContainer, aCanvas, aTarget->GetBackendType())); + if (!entry) { + return nullptr; + } + + MOZ_ASSERT(aSizeOut); + + gImageCache->MarkUsed(entry->mData.get()); + *aSizeOut = entry->mData->mSize; + *aIntrinsicSizeOut = entry->mData->mIntrinsicSize; + return entry->mData->mSourceSurface; +} + +NS_IMPL_ISUPPORTS(CanvasImageCacheShutdownObserver, nsIObserver) + +NS_IMETHODIMP +CanvasImageCacheShutdownObserver::Observe(nsISupports* aSubject, + const char* aTopic, + const char16_t* aData) { + if (strcmp(aTopic, NS_XPCOM_SHUTDOWN_OBSERVER_ID) == 0) { + delete gImageCache; + gImageCache = nullptr; + + nsContentUtils::UnregisterShutdownObserver(this); + } + + return NS_OK; +} + +} // namespace mozilla -- cgit v1.2.3