1 2 /* 3 * Copyright 2006 The Android Open Source Project 4 * 5 * Use of this source code is governed by a BSD-style license that can be 6 * found in the LICENSE file. 7 */ 8 9 10 #ifndef SkGraphics_DEFINED 11 #define SkGraphics_DEFINED 12 13 #include "SkTypes.h" 14 15 class SkGraphics { 16 public: 17 /** 18 * Call this at process initialization time if your environment does not 19 * permit static global initializers that execute code. Note that 20 * Init() is not thread-safe. 21 */ 22 static void Init(); 23 24 /** 25 * Call this to release any memory held privately, such as the font cache. 26 */ 27 static void Term(); 28 29 /** 30 * Return the version numbers for the library. If the parameter is not 31 * null, it is set to the version number. 32 */ 33 static void GetVersion(int32_t* major, int32_t* minor, int32_t* patch); 34 35 /** 36 * Return the max number of bytes that should be used by the font cache. 37 * If the cache needs to allocate more, it will purge previous entries. 38 * This max can be changed by calling SetFontCacheLimit(). 39 */ 40 static size_t GetFontCacheLimit(); 41 42 /** 43 * Specify the max number of bytes that should be used by the font cache. 44 * If the cache needs to allocate more, it will purge previous entries. 45 * 46 * This function returns the previous setting, as if GetFontCacheLimit() 47 * had be called before the new limit was set. 48 */ 49 static size_t SetFontCacheLimit(size_t bytes); 50 51 /** 52 * For debugging purposes, this will attempt to purge the font cache. It 53 * does not change the limit, but will cause subsequent font measures and 54 * draws to be recreated, since they will no longer be in the cache. 55 */ 56 static void PurgeFontCache(); 57 58 /** 59 * Applications with command line options may pass optional state, such 60 * as cache sizes, here, for instance: 61 * font-cache-limit=12345678 62 * 63 * The flags format is name=value[;name=value...] with no spaces. 64 * This format is subject to change. 65 */ 66 static void SetFlags(const char* flags); 67 68 private: 69 /** This is automatically called by SkGraphics::Init(), and must be 70 implemented by the host OS. This allows the host OS to register a callback 71 with the C++ runtime to call SkGraphics::FreeCaches() 72 */ 73 static void InstallNewHandler(); 74 }; 75 76 class SkAutoGraphics { 77 public: SkAutoGraphics()78 SkAutoGraphics() { 79 SkGraphics::Init(); 80 } ~SkAutoGraphics()81 ~SkAutoGraphics() { 82 SkGraphics::Term(); 83 } 84 }; 85 86 #endif 87 88