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 * Return the number of entries in the font cache. 58 * A cache "entry" is associated with each typeface + pointSize + matrix. 59 */ 60 static int GetFontCacheCountUsed(); 61 62 /** 63 * Return the current limit to the number of entries in the font cache. 64 * A cache "entry" is associated with each typeface + pointSize + matrix. 65 */ 66 static int GetFontCacheCountLimit(); 67 68 /** 69 * Set the limit to the number of entries in the font cache, and return 70 * the previous value. If this new value is lower than the previous, 71 * it will automatically try to purge entries to meet the new limit. 72 */ 73 static int SetFontCacheCountLimit(int count); 74 75 /** 76 * For debugging purposes, this will attempt to purge the font cache. It 77 * does not change the limit, but will cause subsequent font measures and 78 * draws to be recreated, since they will no longer be in the cache. 79 */ 80 static void PurgeFontCache(); 81 82 static size_t GetImageCacheBytesUsed(); 83 static size_t GetImageCacheByteLimit(); 84 static size_t SetImageCacheByteLimit(size_t newLimit); 85 86 /** 87 * Applications with command line options may pass optional state, such 88 * as cache sizes, here, for instance: 89 * font-cache-limit=12345678 90 * 91 * The flags format is name=value[;name=value...] with no spaces. 92 * This format is subject to change. 93 */ 94 static void SetFlags(const char* flags); 95 96 /** 97 * Return the max number of bytes that should be used by the thread-local 98 * font cache. 99 * If the cache needs to allocate more, it will purge previous entries. 100 * This max can be changed by calling SetFontCacheLimit(). 101 * 102 * If this thread has never called SetTLSFontCacheLimit, or has called it 103 * with 0, then this thread is using the shared font cache. In that case, 104 * this function will always return 0, and the caller may want to call 105 * GetFontCacheLimit. 106 */ 107 static size_t GetTLSFontCacheLimit(); 108 109 /** 110 * Specify the max number of bytes that should be used by the thread-local 111 * font cache. If this value is 0, then this thread will use the shared 112 * global font cache. 113 */ 114 static void SetTLSFontCacheLimit(size_t bytes); 115 116 private: 117 /** This is automatically called by SkGraphics::Init(), and must be 118 implemented by the host OS. This allows the host OS to register a callback 119 with the C++ runtime to call SkGraphics::FreeCaches() 120 */ 121 static void InstallNewHandler(); 122 }; 123 124 class SkAutoGraphics { 125 public: 126 SkAutoGraphics() { 127 SkGraphics::Init(); 128 } 129 ~SkAutoGraphics() { 130 SkGraphics::Term(); 131 } 132 }; 133 134 #endif 135
