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 "nsIURI.h"
#include "nsIChannel.h"
#include "nsITimer.h"
#include "gfxUserFontSet.h"
#include "nsHashKeys.h"
#include "nsTHashtable.h"
#include "nsCSSRules.h"
class nsIRequest;
class nsISupports;
class nsPresContext;
class nsIPrincipal;
class nsFontFaceLoader;
class nsCSSFontFaceRule;
// 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(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(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(gfxProxyFontEntry *aProxy,
const char *aMessage,
uint32_t aFlags = nsIScriptError::errorFlag,
nsresult aStatus = NS_OK);
nsresult CheckFontLoad(gfxProxyFontEntry *aFontToLoad,
const gfxFontFaceSrc *aFontFaceSrc,
nsIPrincipal **aPrincipal);
virtual nsresult SyncLoadFontData(gfxProxyFontEntry *aFontToLoad,
const gfxFontFaceSrc *aFontFaceSrc,
uint8_t* &aBuffer,
uint32_t &aBufferLength);
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(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<gfxProxyFontEntry> mFontEntry;
nsRefPtr<gfxFontFamily> mFontFamily;
nsCOMPtr<nsIURI> mFontURI;
nsRefPtr<nsUserFontSet> mFontSet;
nsCOMPtr<nsIChannel> mChannel;
nsCOMPtr<nsITimer> mLoadTimer;
nsIStreamLoader *mStreamLoader;
};
#endif /* !defined(nsFontFaceLoader_h_) */