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1 /* | |
2 * Copyright (c) 2010 Google Inc. All rights reserved. | |
3 * | |
4 * Redistribution and use in source and binary forms, with or without | |
5 * modification, are permitted provided that the following conditions are | |
6 * met: | |
7 * | |
8 * * Redistributions of source code must retain the above copyright | |
9 * notice, this list of conditions and the following disclaimer. | |
10 * * Redistributions in binary form must reproduce the above | |
11 * copyright notice, this list of conditions and the following disclaimer | |
12 * in the documentation and/or other materials provided with the | |
13 * distribution. | |
14 * * Neither the name of Google Inc. nor the names of its | |
15 * contributors may be used to endorse or promote products derived from | |
16 * this software without specific prior written permission. | |
17 * | |
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
29 */ | |
30 | |
31 #ifndef MemoryActivatedFont_h | |
32 #define MemoryActivatedFont_h | |
33 | |
34 #import <wtf/RefCounted.h> | |
35 #import <wtf/RetainPtr.h> | |
36 #import <wtf/text/WTFString.h> | |
37 | |
38 typedef struct CGFont* CGFontRef; | |
39 | |
40 namespace blink { | |
41 | |
42 // MemoryActivatedFont encapsulates a font loaded from another process and | |
43 // activated from memory. | |
44 // | |
45 // Responsibilities: | |
46 // * Holder for the CGFontRef & ATSFontRef belonging to the activated font. | |
47 // * Responsible for unloading the font container when done. | |
48 // | |
49 // Memory Management: | |
50 // The class is reference counted, with each instance of FontPlatformData that | |
51 // uses this class holding a reference to it. | |
52 // Entries are kept track of internally in a hash to allow quick lookup | |
53 // of existing instances for reuse: | |
54 // - fontCacheBySrcFontContainerRef() - key is the ATSFontContainerRef | |
55 // corresponding to the *original in-process NSFont* whose loading was blocked | |
56 // by the sandbox. | |
57 // This is needed to allow lookup of a pre-existing MemoryActivatedFont when | |
58 // creating a new FontPlatformData object. | |
59 // | |
60 // Assumptions: | |
61 // This code assumes that an ATSFontRef is a unique identifier tied to an | |
62 // activated font. i.e. After we activate a font, its ATSFontRef doesn't | |
63 // change. | |
64 // It also assumes that the ATSFoncontainerRef for two in-memory NSFonts that | |
65 // correspond to the same on-disk font file are always the same and don't change | |
66 // with time. | |
67 // | |
68 // Flushing caches: | |
69 // When the system notifies us of a system font cache flush, all FontDataCache | |
70 // objects are destroyed. This should in turn dereference all | |
71 // MemoryActivatedFonts and thus unload all in-memory fonts. | |
72 class MemoryActivatedFont : public RefCounted<MemoryActivatedFont> { | |
73 public: | |
74 // Use to create a new object, see docs on constructor below. | |
75 static PassRefPtr<MemoryActivatedFont> create(uint32_t fontID, NSFont*, CGFo
ntRef); | |
76 ~MemoryActivatedFont(); | |
77 | |
78 // Get cached CGFontRef corresponding to the in-memory font. | |
79 CGFontRef cgFont() { return m_cgFont.get(); } | |
80 | |
81 private: | |
82 // srcFontRef - ATSFontRef belonging to the NSFont object that failed to | |
83 // load in-process. | |
84 // container - a font container corresponding to an identical font that | |
85 // we loaded cross-process. | |
86 MemoryActivatedFont(uint32_t fontID, NSFont*, CGFontRef); | |
87 | |
88 WTF::RetainPtr<CGFontRef> m_cgFont; | |
89 uint32_t m_fontID; | |
90 WTF::String m_inSandboxHashKey; | |
91 }; | |
92 | |
93 } // namespace blink | |
94 | |
95 #endif // MemoryActivatedFont_h | |
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