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 {
ShadowTextShadowText37 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
ShadowTextShadowText42 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
~ShadowTextShadowText60 ~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
copyTextLocallyShadowText75 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
strictly_order_type(const ShadowText & lhs,const ShadowText & rhs)104 inline int strictly_order_type(const ShadowText& lhs, const ShadowText& rhs) {
105 return ShadowText::compare(lhs, rhs) < 0;
106 }
107
compare_type(const ShadowText & lhs,const ShadowText & rhs)108 inline int compare_type(const ShadowText& lhs, const ShadowText& rhs) {
109 return ShadowText::compare(lhs, rhs);
110 }
111
hash_type(const ShadowText & entry)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 {
ShadowTextureShadowTexture120 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
setFontRenderer(FontRenderer & fontRenderer)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