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 SK_API 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 * Return the number of bytes currently used by the font cache. 53 */ 54 static size_t GetFontCacheUsed(); 55 56 /** 57 * For debugging purposes, this will attempt to purge the font cache. It 58 * does not change the limit, but will cause subsequent font measures and 59 * draws to be recreated, since they will no longer be in the cache. 60 */ 61 static void PurgeFontCache(); 62 63 static size_t GetImageCacheBytesUsed(); 64 static size_t GetImageCacheByteLimit(); 65 static size_t SetImageCacheByteLimit(size_t newLimit); 66 67 /** 68 * Applications with command line options may pass optional state, such 69 * as cache sizes, here, for instance: 70 * font-cache-limit=12345678 71 * 72 * The flags format is name=value[;name=value...] with no spaces. 73 * This format is subject to change. 74 */ 75 static void SetFlags(const char* flags); 76 77 /** 78 * Return the max number of bytes that should be used by the thread-local 79 * font cache. 80 * If the cache needs to allocate more, it will purge previous entries. 81 * This max can be changed by calling SetFontCacheLimit(). 82 * 83 * If this thread has never called SetTLSFontCacheLimit, or has called it 84 * with 0, then this thread is using the shared font cache. In that case, 85 * this function will always return 0, and the caller may want to call 86 * GetFontCacheLimit. 87 */ 88 static size_t GetTLSFontCacheLimit(); 89 90 /** 91 * Specify the max number of bytes that should be used by the thread-local 92 * font cache. If this value is 0, then this thread will use the shared 93 * global font cache. 94 */ 95 static void SetTLSFontCacheLimit(size_t bytes); 96 97 private: 98 /** This is automatically called by SkGraphics::Init(), and must be 99 implemented by the host OS. This allows the host OS to register a callback 100 with the C++ runtime to call SkGraphics::FreeCaches() 101 */ 102 static void InstallNewHandler(); 103 }; 104 105 class SkAutoGraphics { 106 public: 107 SkAutoGraphics() { 108 SkGraphics::Init(); 109 } 110 ~SkAutoGraphics() { 111 SkGraphics::Term(); 112 } 113 }; 114 115 #endif 116
