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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 "FontRenderer.h"
     28 #include "Texture.h"
     29 
     30 namespace android {
     31 namespace uirenderer {
     32 
     33 class Caches;
     34 
     35 struct ShadowText {
     36     ShadowText(): len(0), radius(0.0f), textSize(0.0f), typeface(NULL),
     37             flags(0), italicStyle(0.0f), scaleX(0), text(NULL), positions(NULL) {
     38     }
     39 
     40     // len is the number of bytes in text
     41     ShadowText(const SkPaint* paint, float radius, uint32_t len, const char* srcText,
     42             const float* positions):
     43             len(len), radius(radius), positions(positions) {
     44         // TODO: Propagate this through the API, we should not cast here
     45         text = (const char16_t*) srcText;
     46 
     47         textSize = paint->getTextSize();
     48         typeface = paint->getTypeface();
     49 
     50         flags = 0;
     51         if (paint->isFakeBoldText()) {
     52             flags |= Font::kFakeBold;
     53         }
     54 
     55         italicStyle = paint->getTextSkewX();
     56         scaleX = paint->getTextScaleX();
     57     }
     58 
     59     ~ShadowText() {
     60     }
     61 
     62     hash_t hash() const;
     63 
     64     static int compare(const ShadowText& lhs, const ShadowText& rhs);
     65 
     66     bool operator==(const ShadowText& other) const {
     67         return compare(*this, other) == 0;
     68     }
     69 
     70     bool operator!=(const ShadowText& other) const {
     71         return compare(*this, other) != 0;
     72     }
     73 
     74     void copyTextLocally() {
     75         uint32_t charCount = len / sizeof(char16_t);
     76         str.setTo((const char16_t*) text, charCount);
     77         text = str.string();
     78         if (positions != NULL) {
     79             positionsCopy.clear();
     80             positionsCopy.appendArray(positions, charCount * 2);
     81             positions = positionsCopy.array();
     82         }
     83     }
     84 
     85     uint32_t len;
     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 
    103 inline int strictly_order_type(const ShadowText& lhs, const ShadowText& rhs) {
    104     return ShadowText::compare(lhs, rhs) < 0;
    105 }
    106 
    107 inline int compare_type(const ShadowText& lhs, const ShadowText& rhs) {
    108     return ShadowText::compare(lhs, rhs);
    109 }
    110 
    111 inline hash_t hash_type(const ShadowText& entry) {
    112     return entry.hash();
    113 }
    114 
    115 /**
    116  * Alpha texture used to represent a shadow.
    117  */
    118 struct ShadowTexture: public Texture {
    119     ShadowTexture(Caches& caches): Texture(caches) {
    120     }
    121 
    122     float left;
    123     float top;
    124 }; // struct ShadowTexture
    125 
    126 class TextDropShadowCache: public OnEntryRemoved<ShadowText, ShadowTexture*> {
    127 public:
    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);
    137 
    138     ShadowTexture* get(const SkPaint* paint, const char* text, uint32_t len,
    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 
    163 private:
    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