TextDropShadowCache.h revision a1717271caac5e8ea3808c331d4141ac01a42134
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 30namespace android { 31namespace uirenderer { 32 33class Caches; 34class FontRenderer; 35 36struct ShadowText { 37 ShadowText(): glyphCount(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 glyphCount, const char* srcText, 43 const float* positions): 44 glyphCount(glyphCount), 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 str.setTo((const char16_t*) text, glyphCount); 77 text = str.string(); 78 if (positions != nullptr) { 79 positionsCopy.clear(); 80 positionsCopy.appendArray(positions, glyphCount * 2); 81 positions = positionsCopy.array(); 82 } 83 } 84 85 uint32_t glyphCount; 86 float radius; 87 float textSize; 88 SkTypeface* typeface; 89 uint32_t flags; 90 float italicStyle; 91 float scaleX; 92 const char16_t* text; 93 const float* positions; 94 95 // Not directly used to compute the cache key 96 String16 str; 97 Vector<float> positionsCopy; 98 99}; // struct ShadowText 100 101// Caching support 102 103inline int strictly_order_type(const ShadowText& lhs, const ShadowText& rhs) { 104 return ShadowText::compare(lhs, rhs) < 0; 105} 106 107inline int compare_type(const ShadowText& lhs, const ShadowText& rhs) { 108 return ShadowText::compare(lhs, rhs); 109} 110 111inline hash_t hash_type(const ShadowText& entry) { 112 return entry.hash(); 113} 114 115/** 116 * Alpha texture used to represent a shadow. 117 */ 118struct ShadowTexture: public Texture { 119 ShadowTexture(Caches& caches): Texture(caches) { 120 } 121 122 float left; 123 float top; 124}; // struct ShadowTexture 125 126class TextDropShadowCache: public OnEntryRemoved<ShadowText, ShadowTexture*> { 127public: 128 TextDropShadowCache(); 129 TextDropShadowCache(uint32_t maxByteSize); 130 ~TextDropShadowCache(); 131 132 /** 133 * Used as a callback when an entry is removed from the cache. 134 * Do not invoke directly. 135 */ 136 void operator()(ShadowText& text, ShadowTexture*& texture) override; 137 138 ShadowTexture* get(const SkPaint* paint, const char* text, 139 int numGlyphs, float radius, const float* positions); 140 141 /** 142 * Clears the cache. This causes all textures to be deleted. 143 */ 144 void clear(); 145 146 void setFontRenderer(FontRenderer& fontRenderer) { 147 mRenderer = &fontRenderer; 148 } 149 150 /** 151 * Sets the maximum size of the cache in bytes. 152 */ 153 void setMaxSize(uint32_t maxSize); 154 /** 155 * Returns the maximum size of the cache in bytes. 156 */ 157 uint32_t getMaxSize(); 158 /** 159 * Returns the current size of the cache in bytes. 160 */ 161 uint32_t getSize(); 162 163private: 164 void init(); 165 166 LruCache<ShadowText, ShadowTexture*> mCache; 167 168 uint32_t mSize; 169 uint32_t mMaxSize; 170 FontRenderer* mRenderer; 171 bool mDebugEnabled; 172}; // class TextDropShadowCache 173 174}; // namespace uirenderer 175}; // namespace android 176 177#endif // ANDROID_HWUI_TEXT_DROP_SHADOW_CACHE_H 178