1 /* 2 * Copyright 2011 Google Inc. 3 * 4 * Use of this source code is governed by a BSD-style license that can be 5 * found in the LICENSE file. 6 */ 7 8 9 10 #ifndef SkTypefaceCache_DEFINED 11 #define SkTypefaceCache_DEFINED 12 13 #include "SkRefCnt.h" 14 #include "SkTypeface.h" 15 #include "SkTArray.h" 16 17 class SkTypefaceCache { 18 public: 19 SkTypefaceCache(); 20 21 /** 22 * Callback for FindByProc. Returns true if the given typeface is a match 23 * for the given context. The passed typeface is owned by the cache and is 24 * not additionally ref()ed. The typeface may be in the disposed state. 25 */ 26 typedef bool(*FindProc)(SkTypeface*, void* context); 27 28 /** 29 * Add a typeface to the cache. This ref()s the typeface, so that the 30 * cache is also an owner. Later, if we need to purge the cache, typefaces 31 * whose refcnt is 1 (meaning only the cache is an owner) will be 32 * unref()ed. 33 */ 34 void add(SkTypeface*); 35 36 /** 37 * Iterate through the cache, calling proc(typeface, ctx) with each 38 * typeface. If proc returns true, then we return that typeface (this 39 * ref()s the typeface). If it never returns true, we return nullptr. 40 */ 41 SkTypeface* findByProcAndRef(FindProc proc, void* ctx) const; 42 43 /** 44 * This will unref all of the typefaces in the cache for which the cache 45 * is the only owner. Normally this is handled automatically as needed. 46 * This function is exposed for clients that explicitly want to purge the 47 * cache (e.g. to look for leaks). 48 */ 49 void purgeAll(); 50 51 /** 52 * Helper: returns a unique fontID to pass to the constructor of 53 * your subclass of SkTypeface 54 */ 55 static SkFontID NewFontID(); 56 57 // These are static wrappers around a global instance of a cache. 58 59 static void Add(SkTypeface*); 60 static SkTypeface* FindByProcAndRef(FindProc proc, void* ctx); 61 static void PurgeAll(); 62 63 /** 64 * Debugging only: dumps the status of the typefaces in the cache 65 */ 66 static void Dump(); 67 68 private: 69 static SkTypefaceCache& Get(); 70 71 void purge(int count); 72 73 SkTArray<sk_sp<SkTypeface>> fTypefaces; 74 }; 75 76 #endif 77
