TextDropShadowCache.h revision cabfcc1364eb7e4de0b15b3574fba45027b45cfc
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/String16.h> 25 26#include "utils/Compare.h" 27#include "utils/GenerationCache.h" 28#include "FontRenderer.h" 29#include "Texture.h" 30 31namespace android { 32namespace uirenderer { 33 34struct ShadowText { 35 ShadowText(): radius(0), len(0), textSize(0.0f), typeface(NULL) { 36 } 37 38 ShadowText(SkPaint* paint, uint32_t radius, uint32_t len, const char* srcText): 39 radius(radius), len(len) { 40 // TODO: Propagate this through the API, we should not cast here 41 text = (const char16_t*) srcText; 42 43 textSize = paint->getTextSize(); 44 typeface = paint->getTypeface(); 45 46 flags = 0; 47 if (paint->isFakeBoldText()) { 48 flags |= Font::kFakeBold; 49 } 50 51 const float skewX = paint->getTextSkewX(); 52 italicStyle = *(uint32_t*) &skewX; 53 54 const float scaleXFloat = paint->getTextScaleX(); 55 scaleX = *(uint32_t*) &scaleXFloat; 56 } 57 58 ~ShadowText() { 59 } 60 61 uint32_t radius; 62 uint32_t len; 63 float textSize; 64 SkTypeface* typeface; 65 uint32_t flags; 66 uint32_t italicStyle; 67 uint32_t scaleX; 68 const char16_t* text; 69 String16 str; 70 71 void copyTextLocally() { 72 str.setTo((const char16_t*) text, len >> 1); 73 text = str.string(); 74 } 75 76 // TODO: Should take into account fake bold and text skew 77 bool operator<(const ShadowText& rhs) const { 78 LTE_INT(len) { 79 LTE_INT(radius) { 80 LTE_FLOAT(textSize) { 81 LTE_INT(typeface) { 82 LTE_INT(flags) { 83 LTE_INT(italicStyle) { 84 LTE_INT(scaleX) { 85 return strncmp16(text, rhs.text, len >> 1) < 0; 86 } 87 } 88 } 89 } 90 } 91 } 92 } 93 return false; 94 } 95}; // struct ShadowText 96 97/** 98 * Alpha texture used to represent a shadow. 99 */ 100struct ShadowTexture: public Texture { 101 ShadowTexture(): Texture() { 102 } 103 104 float left; 105 float top; 106}; // struct ShadowTexture 107 108class TextDropShadowCache: public OnEntryRemoved<ShadowText, ShadowTexture*> { 109public: 110 TextDropShadowCache(); 111 TextDropShadowCache(uint32_t maxByteSize); 112 ~TextDropShadowCache(); 113 114 /** 115 * Used as a callback when an entry is removed from the cache. 116 * Do not invoke directly. 117 */ 118 void operator()(ShadowText& text, ShadowTexture*& texture); 119 120 ShadowTexture* get(SkPaint* paint, const char* text, uint32_t len, 121 int numGlyphs, uint32_t radius); 122 123 /** 124 * Clears the cache. This causes all textures to be deleted. 125 */ 126 void clear(); 127 128 void setFontRenderer(FontRenderer& fontRenderer) { 129 mRenderer = &fontRenderer; 130 } 131 132 /** 133 * Sets the maximum size of the cache in bytes. 134 */ 135 void setMaxSize(uint32_t maxSize); 136 /** 137 * Returns the maximum size of the cache in bytes. 138 */ 139 uint32_t getMaxSize(); 140 /** 141 * Returns the current size of the cache in bytes. 142 */ 143 uint32_t getSize(); 144 145private: 146 void init(); 147 148 GenerationCache<ShadowText, ShadowTexture*> mCache; 149 150 uint32_t mSize; 151 uint32_t mMaxSize; 152 FontRenderer* mRenderer; 153 bool mDebugEnabled; 154}; // class TextDropShadowCache 155 156}; // namespace uirenderer 157}; // namespace android 158 159#endif // ANDROID_HWUI_TEXT_DROP_SHADOW_CACHE_H 160