mirror of
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131 lines
3.2 KiB
C++
131 lines
3.2 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "ImageCacheKey.h"
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#include "mozilla/Move.h"
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#include "File.h"
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#include "ImageURL.h"
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#include "nsHostObjectProtocolHandler.h"
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#include "nsString.h"
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namespace mozilla {
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using namespace dom;
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namespace image {
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bool
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URISchemeIs(ImageURL* aURI, const char* aScheme)
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{
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bool schemeMatches = false;
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if (NS_WARN_IF(NS_FAILED(aURI->SchemeIs(aScheme, &schemeMatches)))) {
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return false;
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}
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return schemeMatches;
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}
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static Maybe<uint64_t>
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BlobSerial(ImageURL* aURI)
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{
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nsAutoCString spec;
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aURI->GetSpec(spec);
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nsRefPtr<BlobImpl> blob;
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if (NS_SUCCEEDED(NS_GetBlobForBlobURISpec(spec, getter_AddRefs(blob))) &&
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blob) {
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return Some(blob->GetSerialNumber());
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}
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return Nothing();
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}
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ImageCacheKey::ImageCacheKey(nsIURI* aURI)
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: mURI(new ImageURL(aURI))
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, mIsChrome(URISchemeIs(mURI, "chrome"))
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{
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MOZ_ASSERT(NS_IsMainThread());
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if (URISchemeIs(mURI, "blob")) {
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mBlobSerial = BlobSerial(mURI);
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}
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mHash = ComputeHash(mURI, mBlobSerial);
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}
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ImageCacheKey::ImageCacheKey(ImageURL* aURI)
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: mURI(aURI)
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, mIsChrome(URISchemeIs(mURI, "chrome"))
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{
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MOZ_ASSERT(aURI);
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if (URISchemeIs(mURI, "blob")) {
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mBlobSerial = BlobSerial(mURI);
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}
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mHash = ComputeHash(mURI, mBlobSerial);
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}
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ImageCacheKey::ImageCacheKey(const ImageCacheKey& aOther)
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: mURI(aOther.mURI)
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, mBlobSerial(aOther.mBlobSerial)
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, mHash(aOther.mHash)
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, mIsChrome(aOther.mIsChrome)
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{ }
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ImageCacheKey::ImageCacheKey(ImageCacheKey&& aOther)
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: mURI(Move(aOther.mURI))
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, mBlobSerial(Move(aOther.mBlobSerial))
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, mHash(aOther.mHash)
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, mIsChrome(aOther.mIsChrome)
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{ }
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bool
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ImageCacheKey::operator==(const ImageCacheKey& aOther) const
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{
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if (mBlobSerial || aOther.mBlobSerial) {
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// If at least one of us has a blob serial, just compare the blob serial and
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// the ref portion of the URIs.
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return mBlobSerial == aOther.mBlobSerial &&
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mURI->HasSameRef(*aOther.mURI);
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}
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// For non-blob URIs, compare the URIs.
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return *mURI == *aOther.mURI;
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}
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const char*
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ImageCacheKey::Spec() const
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{
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return mURI->Spec();
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}
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/* static */ uint32_t
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ImageCacheKey::ComputeHash(ImageURL* aURI,
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const Maybe<uint64_t>& aBlobSerial)
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{
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// Since we frequently call Hash() several times in a row on the same
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// ImageCacheKey, as an optimization we compute our hash once and store it.
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if (aBlobSerial) {
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// For blob URIs, we hash the serial number of the underlying blob, so that
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// different blob URIs which point to the same blob share a cache entry. We
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// also include the ref portion of the URI to support -moz-samplesize and
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// -moz-resolution, which require us to create different Image objects even
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// if the source data is the same.
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nsAutoCString ref;
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aURI->GetRef(ref);
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return HashGeneric(*aBlobSerial, HashString(ref));
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}
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// For non-blob URIs, we hash the URI spec.
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nsAutoCString spec;
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aURI->GetSpec(spec);
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return HashString(spec);
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}
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} // namespace image
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} // namespace mozilla
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