1 : /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
2 : // vim:cindent:ts=2:et:sw=2:
3 : /* ***** BEGIN LICENSE BLOCK *****
4 : * Version: MPL 1.1/GPL 2.0/LGPL 2.1
5 : *
6 : * The contents of this file are subject to the Mozilla Public License Version
7 : * 1.1 (the "License"); you may not use this file except in compliance with
8 : * the License. You may obtain a copy of the License at
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18 : * The Initial Developer of the Original Code is
19 : * Mozilla Foundation.
20 : * Portions created by the Initial Developer are Copyright (C) 2008
21 : * the Initial Developer. All Rights Reserved.
22 : *
23 : * Contributor(s):
24 : * John Daggett <jdaggett@mozilla.com>
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38 : * ***** END LICENSE BLOCK ***** */
39 :
40 : /* code for loading in @font-face defined font data */
41 :
42 : #ifndef nsFontFaceLoader_h_
43 : #define nsFontFaceLoader_h_
44 :
45 : #include "nsCOMPtr.h"
46 : #include "nsIStreamLoader.h"
47 : #include "nsIURI.h"
48 : #include "nsIChannel.h"
49 : #include "nsITimer.h"
50 : #include "gfxUserFontSet.h"
51 : #include "nsHashKeys.h"
52 : #include "nsTHashtable.h"
53 : #include "nsCSSRules.h"
54 :
55 : class nsIRequest;
56 : class nsISupports;
57 : class nsPresContext;
58 : class nsIPrincipal;
59 :
60 : class nsFontFaceLoader;
61 : class nsCSSFontFaceRule;
62 :
63 : // nsUserFontSet - defines the loading mechanism for downloadable fonts
64 : class nsUserFontSet : public gfxUserFontSet
65 : {
66 : public:
67 : nsUserFontSet(nsPresContext *aContext);
68 : ~nsUserFontSet();
69 :
70 : // Called when this font set is no longer associated with a presentation.
71 : void Destroy();
72 :
73 : // starts loading process, creating and initializing a nsFontFaceLoader obj
74 : // returns whether load process successfully started or not
75 : nsresult StartLoad(gfxProxyFontEntry *aFontToLoad,
76 : const gfxFontFaceSrc *aFontFaceSrc);
77 :
78 : // Called by nsFontFaceLoader when the loader has completed normally.
79 : // It's removed from the mLoaders set.
80 : void RemoveLoader(nsFontFaceLoader *aLoader);
81 :
82 : bool UpdateRules(const nsTArray<nsFontFaceRuleContainer>& aRules);
83 :
84 0 : nsPresContext *GetPresContext() { return mPresContext; }
85 :
86 : virtual void ReplaceFontEntry(gfxProxyFontEntry *aProxy,
87 : gfxFontEntry *aFontEntry);
88 :
89 : nsCSSFontFaceRule *FindRuleForEntry(gfxFontEntry *aFontEntry);
90 :
91 : protected:
92 : // The font-set keeps track of the collection of rules, and their
93 : // corresponding font entries (whether proxies or real entries),
94 : // so that we can update the set without having to throw away
95 : // all the existing fonts.
96 0 : struct FontFaceRuleRecord {
97 : nsRefPtr<gfxFontEntry> mFontEntry;
98 : nsFontFaceRuleContainer mContainer;
99 : };
100 :
101 : void InsertRule(nsCSSFontFaceRule *aRule, PRUint8 aSheetType,
102 : nsTArray<FontFaceRuleRecord>& oldRules,
103 : bool& aFontSetModified);
104 :
105 : virtual nsresult LogMessage(gfxProxyFontEntry *aProxy,
106 : const char *aMessage,
107 : PRUint32 aFlags = nsIScriptError::errorFlag,
108 : nsresult aStatus = 0);
109 :
110 : nsPresContext *mPresContext; // weak reference
111 :
112 : // Set of all loaders pointing to us. These are not strong pointers,
113 : // but that's OK because nsFontFaceLoader always calls RemoveLoader on
114 : // us before it dies (unless we die first).
115 : nsTHashtable< nsPtrHashKey<nsFontFaceLoader> > mLoaders;
116 :
117 : nsTArray<FontFaceRuleRecord> mRules;
118 : };
119 :
120 : class nsFontFaceLoader : public nsIStreamLoaderObserver
121 : {
122 : public:
123 :
124 : nsFontFaceLoader(gfxProxyFontEntry *aFontToLoad, nsIURI *aFontURI,
125 : nsUserFontSet *aFontSet, nsIChannel *aChannel);
126 : virtual ~nsFontFaceLoader();
127 :
128 : NS_DECL_ISUPPORTS
129 : NS_DECL_NSISTREAMLOADEROBSERVER
130 :
131 : // initiate the load
132 : nsresult Init();
133 : // cancel the load and remove its reference to mFontSet
134 : void Cancel();
135 :
136 0 : void DropChannel() { mChannel = nsnull; }
137 :
138 : void StartedLoading(nsIStreamLoader *aStreamLoader);
139 :
140 : static void LoadTimerCallback(nsITimer *aTimer, void *aClosure);
141 :
142 : static nsresult CheckLoadAllowed(nsIPrincipal* aSourcePrincipal,
143 : nsIURI* aTargetURI,
144 : nsISupports* aContext);
145 :
146 : private:
147 : nsRefPtr<gfxProxyFontEntry> mFontEntry;
148 : nsRefPtr<gfxFontFamily> mFontFamily;
149 : nsCOMPtr<nsIURI> mFontURI;
150 : nsRefPtr<nsUserFontSet> mFontSet;
151 : nsCOMPtr<nsIChannel> mChannel;
152 : nsCOMPtr<nsITimer> mLoadTimer;
153 :
154 : nsIStreamLoader *mStreamLoader;
155 : };
156 :
157 : #endif /* !defined(nsFontFaceLoader_h_) */
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