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      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