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31 #ifndef MemoryActivatedFont_h
32 #define MemoryActivatedFont_h
34 #import <wtf/RefCounted.h>
35 #import <wtf/RetainPtr.h>
36 #import <wtf/text/WTFString.h>
38 typedef struct CGFont* CGFontRef;
42 // MemoryActivatedFont encapsulates a font loaded from another process and
43 // activated from memory.
46 // * Holder for the CGFontRef & ATSFontRef belonging to the activated font.
47 // * Responsible for unloading the font container when done.
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
57 // This is needed to allow lookup of a pre-existing MemoryActivatedFont when
58 // creating a new FontPlatformData object.
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
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
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> {
74 // Use to create a new object, see docs on constructor below.
75 static PassRefPtr<MemoryActivatedFont> create(uint32_t fontID, NSFont*, CGFontRef);
76 ~MemoryActivatedFont();
78 // Get cached CGFontRef corresponding to the in-memory font.
79 CGFontRef cgFont() { return m_cgFont.get(); }
82 // srcFontRef - ATSFontRef belonging to the NSFont object that failed to
84 // container - a font container corresponding to an identical font that
85 // we loaded cross-process.
86 MemoryActivatedFont(uint32_t fontID, NSFont*, CGFontRef);
88 WTF::RetainPtr<CGFontRef> m_cgFont;
90 WTF::String m_inSandboxHashKey;
95 #endif // MemoryActivatedFont_h