1 /* 2 * Copyright (C) 2010 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef ANDROID_HWUI_TEXT_DROP_SHADOW_CACHE_H 18 #define ANDROID_HWUI_TEXT_DROP_SHADOW_CACHE_H 19 20 #include <GLES2/gl2.h> 21 22 #include <SkPaint.h> 23 24 #include <utils/LruCache.h> 25 #include <utils/String16.h> 26 27 #include "font/Font.h" 28 #include "Texture.h" 29 30 namespace android { 31 namespace uirenderer { 32 33 class Caches; 34 class FontRenderer; 35 36 struct ShadowText { 37 ShadowText(): len(0), radius(0.0f), textSize(0.0f), typeface(nullptr), 38 flags(0), italicStyle(0.0f), scaleX(0), text(nullptr), positions(nullptr) { 39 } 40 41 // len is the number of bytes in text 42 ShadowText(const SkPaint* paint, float radius, uint32_t len, const char* srcText, 43 const float* positions): 44 len(len), radius(radius), positions(positions) { 45 // TODO: Propagate this through the API, we should not cast here 46 text = (const char16_t*) srcText; 47 48 textSize = paint->getTextSize(); 49 typeface = paint->getTypeface(); 50 51 flags = 0; 52 if (paint->isFakeBoldText()) { 53 flags |= Font::kFakeBold; 54 } 55 56 italicStyle = paint->getTextSkewX(); 57 scaleX = paint->getTextScaleX(); 58 } 59 60 ~ShadowText() { 61 } 62 63 hash_t hash() const; 64 65 static int compare(const ShadowText& lhs, const ShadowText& rhs); 66 67 bool operator==(const ShadowText& other) const { 68 return compare(*this, other) == 0; 69 } 70 71 bool operator!=(const ShadowText& other) const { 72 return compare(*this, other) != 0; 73 } 74 75 void copyTextLocally() { 76 uint32_t charCount = len / sizeof(char16_t); 77 str.setTo((const char16_t*) text, charCount); 78 text = str.string(); 79 if (positions != nullptr) { 80 positionsCopy.clear(); 81 positionsCopy.appendArray(positions, charCount * 2); 82 positions = positionsCopy.array(); 83 } 84 } 85 86 uint32_t len; 87 float radius; 88 float textSize; 89 SkTypeface* typeface; 90 uint32_t flags; 91 float italicStyle; 92 float scaleX; 93 const char16_t* text; 94 const float* positions; 95 96 // Not directly used to compute the cache key 97 String16 str; 98 Vector<float> positionsCopy; 99 100 }; // struct ShadowText 101 102 // Caching support 103 104 inline int strictly_order_type(const ShadowText& lhs, const ShadowText& rhs) { 105 return ShadowText::compare(lhs, rhs) < 0; 106 } 107 108 inline int compare_type(const ShadowText& lhs, const ShadowText& rhs) { 109 return ShadowText::compare(lhs, rhs); 110 } 111 112 inline hash_t hash_type(const ShadowText& entry) { 113 return entry.hash(); 114 } 115 116 /** 117 * Alpha texture used to represent a shadow. 118 */ 119 struct ShadowTexture: public Texture { 120 ShadowTexture(Caches& caches): Texture(caches) { 121 } 122 123 float left; 124 float top; 125 }; // struct ShadowTexture 126 127 class TextDropShadowCache: public OnEntryRemoved<ShadowText, ShadowTexture*> { 128 public: 129 TextDropShadowCache(); 130 TextDropShadowCache(uint32_t maxByteSize); 131 ~TextDropShadowCache(); 132 133 /** 134 * Used as a callback when an entry is removed from the cache. 135 * Do not invoke directly. 136 */ 137 void operator()(ShadowText& text, ShadowTexture*& texture) override; 138 139 ShadowTexture* get(const SkPaint* paint, const char* text, uint32_t len, 140 int numGlyphs, float radius, const float* positions); 141 142 /** 143 * Clears the cache. This causes all textures to be deleted. 144 */ 145 void clear(); 146 147 void setFontRenderer(FontRenderer& fontRenderer) { 148 mRenderer = &fontRenderer; 149 } 150 151 /** 152 * Sets the maximum size of the cache in bytes. 153 */ 154 void setMaxSize(uint32_t maxSize); 155 /** 156 * Returns the maximum size of the cache in bytes. 157 */ 158 uint32_t getMaxSize(); 159 /** 160 * Returns the current size of the cache in bytes. 161 */ 162 uint32_t getSize(); 163 164 private: 165 void init(); 166 167 LruCache<ShadowText, ShadowTexture*> mCache; 168 169 uint32_t mSize; 170 uint32_t mMaxSize; 171 FontRenderer* mRenderer; 172 bool mDebugEnabled; 173 }; // class TextDropShadowCache 174 175 }; // namespace uirenderer 176 }; // namespace android 177 178 #endif // ANDROID_HWUI_TEXT_DROP_SHADOW_CACHE_H 179