• Home
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
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 {
ShadowTextShadowText36     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
ShadowTextShadowText41     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 
~ShadowTextShadowText59     ~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 
copyTextLocallyShadowText74     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 
strictly_order_type(const ShadowText & lhs,const ShadowText & rhs)103 inline int strictly_order_type(const ShadowText& lhs, const ShadowText& rhs) {
104     return ShadowText::compare(lhs, rhs) < 0;
105 }
106 
compare_type(const ShadowText & lhs,const ShadowText & rhs)107 inline int compare_type(const ShadowText& lhs, const ShadowText& rhs) {
108     return ShadowText::compare(lhs, rhs);
109 }
110 
hash_type(const ShadowText & entry)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 {
ShadowTextureShadowTexture119     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 
setFontRenderer(FontRenderer & fontRenderer)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