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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/String16.h>
     25 
     26 #include "utils/Compare.h"
     27 #include "utils/GenerationCache.h"
     28 #include "FontRenderer.h"
     29 #include "Texture.h"
     30 
     31 namespace android {
     32 namespace uirenderer {
     33 
     34 struct 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     bool operator<(const ShadowText& rhs) const {
     77         LTE_INT(len) {
     78             LTE_INT(radius) {
     79                 LTE_FLOAT(textSize) {
     80                     LTE_INT(typeface) {
     81                         LTE_INT(flags) {
     82                             LTE_INT(italicStyle) {
     83                                 LTE_INT(scaleX) {
     84                                     return memcmp(text, rhs.text, len) < 0;
     85                                 }
     86                             }
     87                         }
     88                     }
     89                 }
     90             }
     91         }
     92         return false;
     93     }
     94 }; // struct ShadowText
     95 
     96 /**
     97  * Alpha texture used to represent a shadow.
     98  */
     99 struct ShadowTexture: public Texture {
    100     ShadowTexture(): Texture() {
    101     }
    102 
    103     float left;
    104     float top;
    105 }; // struct ShadowTexture
    106 
    107 class TextDropShadowCache: public OnEntryRemoved<ShadowText, ShadowTexture*> {
    108 public:
    109     TextDropShadowCache();
    110     TextDropShadowCache(uint32_t maxByteSize);
    111     ~TextDropShadowCache();
    112 
    113     /**
    114      * Used as a callback when an entry is removed from the cache.
    115      * Do not invoke directly.
    116      */
    117     void operator()(ShadowText& text, ShadowTexture*& texture);
    118 
    119     ShadowTexture* get(SkPaint* paint, const char* text, uint32_t len,
    120             int numGlyphs, uint32_t radius);
    121 
    122     /**
    123      * Clears the cache. This causes all textures to be deleted.
    124      */
    125     void clear();
    126 
    127     void setFontRenderer(FontRenderer& fontRenderer) {
    128         mRenderer = &fontRenderer;
    129     }
    130 
    131     /**
    132      * Sets the maximum size of the cache in bytes.
    133      */
    134     void setMaxSize(uint32_t maxSize);
    135     /**
    136      * Returns the maximum size of the cache in bytes.
    137      */
    138     uint32_t getMaxSize();
    139     /**
    140      * Returns the current size of the cache in bytes.
    141      */
    142     uint32_t getSize();
    143 
    144 private:
    145     void init();
    146 
    147     GenerationCache<ShadowText, ShadowTexture*> mCache;
    148 
    149     uint32_t mSize;
    150     uint32_t mMaxSize;
    151     FontRenderer* mRenderer;
    152     bool mDebugEnabled;
    153 }; // class TextDropShadowCache
    154 
    155 }; // namespace uirenderer
    156 }; // namespace android
    157 
    158 #endif // ANDROID_HWUI_TEXT_DROP_SHADOW_CACHE_H
    159