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 "FontRenderer.h" 28 #include "Texture.h" 29 30 namespace android { 31 namespace uirenderer { 32 33 struct ShadowText { 34 ShadowText(): len(0), radius(0.0f), textSize(0.0f), typeface(NULL), 35 flags(0), italicStyle(0.0f), scaleX(0), text(NULL), positions(NULL) { 36 } 37 38 // len is the number of bytes in text 39 ShadowText(SkPaint* paint, float radius, uint32_t len, const char* srcText, 40 const float* positions): 41 len(len), radius(radius), positions(positions) { 42 // TODO: Propagate this through the API, we should not cast here 43 text = (const char16_t*) srcText; 44 45 textSize = paint->getTextSize(); 46 typeface = paint->getTypeface(); 47 48 flags = 0; 49 if (paint->isFakeBoldText()) { 50 flags |= Font::kFakeBold; 51 } 52 53 italicStyle = paint->getTextSkewX(); 54 scaleX = paint->getTextScaleX(); 55 } 56 57 ~ShadowText() { 58 } 59 60 hash_t hash() const; 61 62 static int compare(const ShadowText& lhs, const ShadowText& rhs); 63 64 bool operator==(const ShadowText& other) const { 65 return compare(*this, other) == 0; 66 } 67 68 bool operator!=(const ShadowText& other) const { 69 return compare(*this, other) != 0; 70 } 71 72 void copyTextLocally() { 73 uint32_t charCount = len / sizeof(char16_t); 74 str.setTo((const char16_t*) text, charCount); 75 text = str.string(); 76 if (positions != NULL) { 77 positionsCopy.clear(); 78 positionsCopy.appendArray(positions, charCount * 2); 79 positions = positionsCopy.array(); 80 } 81 } 82 83 uint32_t len; 84 float radius; 85 float textSize; 86 SkTypeface* typeface; 87 uint32_t flags; 88 float italicStyle; 89 float scaleX; 90 const char16_t* text; 91 const float* positions; 92 93 // Not directly used to compute the cache key 94 String16 str; 95 Vector<float> positionsCopy; 96 97 }; // struct ShadowText 98 99 // Caching support 100 101 inline int strictly_order_type(const ShadowText& lhs, const ShadowText& rhs) { 102 return ShadowText::compare(lhs, rhs) < 0; 103 } 104 105 inline int compare_type(const ShadowText& lhs, const ShadowText& rhs) { 106 return ShadowText::compare(lhs, rhs); 107 } 108 109 inline hash_t hash_type(const ShadowText& entry) { 110 return entry.hash(); 111 } 112 113 /** 114 * Alpha texture used to represent a shadow. 115 */ 116 struct ShadowTexture: public Texture { 117 ShadowTexture(): Texture() { 118 } 119 120 float left; 121 float top; 122 }; // struct ShadowTexture 123 124 class TextDropShadowCache: public OnEntryRemoved<ShadowText, ShadowTexture*> { 125 public: 126 TextDropShadowCache(); 127 TextDropShadowCache(uint32_t maxByteSize); 128 ~TextDropShadowCache(); 129 130 /** 131 * Used as a callback when an entry is removed from the cache. 132 * Do not invoke directly. 133 */ 134 void operator()(ShadowText& text, ShadowTexture*& texture); 135 136 ShadowTexture* get(SkPaint* paint, const char* text, uint32_t len, 137 int numGlyphs, float radius, const float* positions); 138 139 /** 140 * Clears the cache. This causes all textures to be deleted. 141 */ 142 void clear(); 143 144 void setFontRenderer(FontRenderer& fontRenderer) { 145 mRenderer = &fontRenderer; 146 } 147 148 /** 149 * Sets the maximum size of the cache in bytes. 150 */ 151 void setMaxSize(uint32_t maxSize); 152 /** 153 * Returns the maximum size of the cache in bytes. 154 */ 155 uint32_t getMaxSize(); 156 /** 157 * Returns the current size of the cache in bytes. 158 */ 159 uint32_t getSize(); 160 161 private: 162 void init(); 163 164 LruCache<ShadowText, ShadowTexture*> mCache; 165 166 uint32_t mSize; 167 uint32_t mMaxSize; 168 FontRenderer* mRenderer; 169 bool mDebugEnabled; 170 }; // class TextDropShadowCache 171 172 }; // namespace uirenderer 173 }; // namespace android 174 175 #endif // ANDROID_HWUI_TEXT_DROP_SHADOW_CACHE_H 176