1 /* 2 * Copyright 2006 The Android Open Source Project 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 #ifndef SkGraphics_DEFINED 9 #define SkGraphics_DEFINED 10 11 #include "SkRefCnt.h" 12 13 class SkData; 14 class SkImageGenerator; 15 class SkTraceMemoryDump; 16 17 class SK_API SkGraphics { 18 public: 19 /** 20 * Call this at process initialization time if your environment does not 21 * permit static global initializers that execute code. 22 * Init() is thread-safe and idempotent. 23 */ 24 static void Init(); 25 26 // We're in the middle of cleaning this up. Term()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 * Returns the maximum point size for text that may be cached. 77 * 78 * Sizes above this will be drawn directly from the font's outline. 79 * Setting this to a large value may speed up drawing larger text (repeatedly), 80 * but could cause the cache to purge other sizes more often. 81 * 82 * This value is a hint to the font engine, and the actual limit may be different due to 83 * implementation specific details. 84 */ 85 static int GetFontCachePointSizeLimit(); 86 87 /* 88 * Set the maximum point size for text that may be cached, returning the previous value. 89 * 90 * Sizes above this will be drawn directly from the font's outline. 91 * Setting this to a large value may speed up drawing larger text (repeatedly), 92 * but could cause the cache to purge other sizes more often. 93 * 94 * This value is a hint to the font engine, and the actual limit may be different due to 95 * implementation specific details. 96 */ 97 static int SetFontCachePointSizeLimit(int maxPointSize); 98 99 /** 100 * For debugging purposes, this will attempt to purge the font cache. It 101 * does not change the limit, but will cause subsequent font measures and 102 * draws to be recreated, since they will no longer be in the cache. 103 */ 104 static void PurgeFontCache(); 105 106 /** 107 * Scaling bitmaps with the kHigh_SkFilterQuality setting is 108 * expensive, so the result is saved in the global Scaled Image 109 * Cache. 110 * 111 * This function returns the memory usage of the Scaled Image Cache. 112 */ 113 static size_t GetResourceCacheTotalBytesUsed(); 114 115 /** 116 * These functions get/set the memory usage limit for the resource cache, used for temporary 117 * bitmaps and other resources. Entries are purged from the cache when the memory useage 118 * exceeds this limit. 119 */ 120 static size_t GetResourceCacheTotalByteLimit(); 121 static size_t SetResourceCacheTotalByteLimit(size_t newLimit); 122 123 /** 124 * For debugging purposes, this will attempt to purge the resource cache. It 125 * does not change the limit. 126 */ 127 static void PurgeResourceCache(); 128 129 /** 130 * When the cachable entry is very lage (e.g. a large scaled bitmap), adding it to the cache 131 * can cause most/all of the existing entries to be purged. To avoid the, the client can set 132 * a limit for a single allocation. If a cacheable entry would have been cached, but its size 133 * exceeds this limit, then we do not attempt to cache it at all. 134 * 135 * Zero is the default value, meaning we always attempt to cache entries. 136 */ 137 static size_t GetResourceCacheSingleAllocationByteLimit(); 138 static size_t SetResourceCacheSingleAllocationByteLimit(size_t newLimit); 139 140 /** 141 * Dumps memory usage of caches using the SkTraceMemoryDump interface. See SkTraceMemoryDump 142 * for usage of this method. 143 */ 144 static void DumpMemoryStatistics(SkTraceMemoryDump* dump); 145 146 /** 147 * Free as much globally cached memory as possible. This will purge all private caches in Skia, 148 * including font and image caches. 149 * 150 * If there are caches associated with GPU context, those will not be affected by this call. 151 */ 152 static void PurgeAllCaches(); 153 154 /** 155 * Applications with command line options may pass optional state, such 156 * as cache sizes, here, for instance: 157 * font-cache-limit=12345678 158 * 159 * The flags format is name=value[;name=value...] with no spaces. 160 * This format is subject to change. 161 */ 162 static void SetFlags(const char* flags); 163 164 /** 165 * Return the max number of bytes that should be used by the thread-local 166 * font cache. 167 * If the cache needs to allocate more, it will purge previous entries. 168 * This max can be changed by calling SetFontCacheLimit(). 169 * 170 * If this thread has never called SetTLSFontCacheLimit, or has called it 171 * with 0, then this thread is using the shared font cache. In that case, 172 * this function will always return 0, and the caller may want to call 173 * GetFontCacheLimit. 174 */ 175 static size_t GetTLSFontCacheLimit(); 176 177 /** 178 * Specify the max number of bytes that should be used by the thread-local 179 * font cache. If this value is 0, then this thread will use the shared 180 * global font cache. 181 */ 182 static void SetTLSFontCacheLimit(size_t bytes); 183 184 typedef std::unique_ptr<SkImageGenerator> 185 (*ImageGeneratorFromEncodedDataFactory)(sk_sp<SkData>); 186 187 /** 188 * To instantiate images from encoded data, first looks at this runtime function-ptr. If it 189 * exists, it is called to create an SkImageGenerator from SkData. If there is no function-ptr 190 * or there is, but it returns NULL, then skia will call its internal default implementation. 191 * 192 * Returns the previous factory (which could be NULL). 193 */ 194 static ImageGeneratorFromEncodedDataFactory 195 SetImageGeneratorFromEncodedDataFactory(ImageGeneratorFromEncodedDataFactory); 196 }; 197 198 class SkAutoGraphics { 199 public: SkAutoGraphics()200 SkAutoGraphics() { 201 SkGraphics::Init(); 202 } 203 }; 204 205 #endif 206