gecko-dev/layout/style/nsFontFaceLoader.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
// vim:cindent:ts=2:et:sw=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/. */
/* code for loading in @font-face defined font data */
#ifndef nsFontFaceLoader_h_
#define nsFontFaceLoader_h_
#include "nsCOMPtr.h"
#include "nsIStreamLoader.h"
#include "nsIChannel.h"
#include "gfxUserFontSet.h"
#include "nsHashKeys.h"
#include "nsTHashtable.h"
#include "nsCSSRules.h"
class nsPresContext;
class nsIPrincipal;
class nsFontFaceLoader;
// nsUserFontSet - defines the loading mechanism for downloadable fonts
class nsUserFontSet : public gfxUserFontSet
{
public:
nsUserFontSet(nsPresContext* aContext);
~nsUserFontSet();
// Called when this font set is no longer associated with a presentation.
void Destroy();
// starts loading process, creating and initializing a nsFontFaceLoader obj
// returns whether load process successfully started or not
nsresult StartLoad(gfxMixedFontFamily* aFamily,
gfxProxyFontEntry* aFontToLoad,
const gfxFontFaceSrc* aFontFaceSrc);
// Called by nsFontFaceLoader when the loader has completed normally.
// It's removed from the mLoaders set.
void RemoveLoader(nsFontFaceLoader* aLoader);
bool UpdateRules(const nsTArray<nsFontFaceRuleContainer>& aRules);
nsPresContext* GetPresContext() { return mPresContext; }
virtual void ReplaceFontEntry(gfxMixedFontFamily* aFamily,
gfxProxyFontEntry* aProxy,
gfxFontEntry* aFontEntry);
nsCSSFontFaceRule* FindRuleForEntry(gfxFontEntry* aFontEntry);
protected:
// The font-set keeps track of the collection of rules, and their
// corresponding font entries (whether proxies or real entries),
// so that we can update the set without having to throw away
// all the existing fonts.
struct FontFaceRuleRecord {
nsRefPtr<gfxFontEntry> mFontEntry;
nsFontFaceRuleContainer mContainer;
};
void InsertRule(nsCSSFontFaceRule* aRule, uint8_t aSheetType,
nsTArray<FontFaceRuleRecord>& oldRules,
bool& aFontSetModified);
virtual nsresult LogMessage(gfxMixedFontFamily* aFamily,
gfxProxyFontEntry* aProxy,
const char* aMessage,
uint32_t aFlags = nsIScriptError::errorFlag,
nsresult aStatus = NS_OK);
virtual nsresult CheckFontLoad(const gfxFontFaceSrc* aFontFaceSrc,
nsIPrincipal** aPrincipal,
bool* aBypassCache);
virtual nsresult SyncLoadFontData(gfxProxyFontEntry* aFontToLoad,
const gfxFontFaceSrc* aFontFaceSrc,
uint8_t*& aBuffer,
uint32_t& aBufferLength);
virtual bool GetPrivateBrowsing() MOZ_OVERRIDE;
nsPresContext* mPresContext; // weak reference
// Set of all loaders pointing to us. These are not strong pointers,
// but that's OK because nsFontFaceLoader always calls RemoveLoader on
// us before it dies (unless we die first).
nsTHashtable< nsPtrHashKey<nsFontFaceLoader> > mLoaders;
nsTArray<FontFaceRuleRecord> mRules;
};
class nsFontFaceLoader : public nsIStreamLoaderObserver
{
public:
nsFontFaceLoader(gfxMixedFontFamily* aFontFamily,
gfxProxyFontEntry* aFontToLoad, nsIURI* aFontURI,
nsUserFontSet* aFontSet, nsIChannel* aChannel);
virtual ~nsFontFaceLoader();
NS_DECL_ISUPPORTS
NS_DECL_NSISTREAMLOADEROBSERVER
// initiate the load
nsresult Init();
// cancel the load and remove its reference to mFontSet
void Cancel();
void DropChannel() { mChannel = nullptr; }
void StartedLoading(nsIStreamLoader* aStreamLoader);
static void LoadTimerCallback(nsITimer* aTimer, void* aClosure);
static nsresult CheckLoadAllowed(nsIPrincipal* aSourcePrincipal,
nsIURI* aTargetURI,
nsISupports* aContext);
private:
nsRefPtr<gfxMixedFontFamily> mFontFamily;
nsRefPtr<gfxProxyFontEntry> mFontEntry;
nsCOMPtr<nsIURI> mFontURI;
nsRefPtr<nsUserFontSet> mFontSet;
nsCOMPtr<nsIChannel> mChannel;
nsCOMPtr<nsITimer> mLoadTimer;
nsIStreamLoader* mStreamLoader;
};
#endif /* !defined(nsFontFaceLoader_h_) */