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
30namespace android {
31namespace uirenderer {
32
33class Caches;
34class FontRenderer;
35
36struct ShadowText {
37    ShadowText(): glyphCount(0), radius(0.0f), textSize(0.0f), typeface(nullptr),
38            flags(0), italicStyle(0.0f), scaleX(0), glyphs(nullptr), positions(nullptr) {
39    }
40
41    // len is the number of bytes in text
42    ShadowText(const SkPaint* paint, float radius, uint32_t glyphCount, const glyph_t* srcGlyphs,
43            const float* positions)
44            : glyphCount(glyphCount)
45            , radius(radius)
46            , textSize(paint->getTextSize())
47            , typeface(paint->getTypeface())
48            , flags(paint->isFakeBoldText() ? Font::kFakeBold : 0)
49            , italicStyle(paint->getTextSkewX())
50            , scaleX(paint->getTextScaleX())
51            , glyphs(srcGlyphs)
52            , positions(positions) {
53    }
54
55    ~ShadowText() {
56    }
57
58    hash_t hash() const;
59
60    static int compare(const ShadowText& lhs, const ShadowText& rhs);
61
62    bool operator==(const ShadowText& other) const {
63        return compare(*this, other) == 0;
64    }
65
66    bool operator!=(const ShadowText& other) const {
67        return compare(*this, other) != 0;
68    }
69
70    void copyTextLocally() {
71        str.setTo(reinterpret_cast<const char16_t*>(glyphs), glyphCount);
72        glyphs = reinterpret_cast<const glyph_t*>(str.string());
73        if (positions != nullptr) {
74            positionsCopy.clear();
75            positionsCopy.appendArray(positions, glyphCount * 2);
76            positions = positionsCopy.array();
77        }
78    }
79
80    uint32_t glyphCount;
81    float radius;
82    float textSize;
83    SkTypeface* typeface;
84    uint32_t flags;
85    float italicStyle;
86    float scaleX;
87    const glyph_t* glyphs;
88    const float* positions;
89
90    // Not directly used to compute the cache key
91    String16 str;
92    Vector<float> positionsCopy;
93
94}; // struct ShadowText
95
96// Caching support
97
98inline int strictly_order_type(const ShadowText& lhs, const ShadowText& rhs) {
99    return ShadowText::compare(lhs, rhs) < 0;
100}
101
102inline int compare_type(const ShadowText& lhs, const ShadowText& rhs) {
103    return ShadowText::compare(lhs, rhs);
104}
105
106inline hash_t hash_type(const ShadowText& entry) {
107    return entry.hash();
108}
109
110/**
111 * Alpha texture used to represent a shadow.
112 */
113struct ShadowTexture: public Texture {
114    ShadowTexture(Caches& caches): Texture(caches) {
115    }
116
117    float left;
118    float top;
119}; // struct ShadowTexture
120
121class TextDropShadowCache: public OnEntryRemoved<ShadowText, ShadowTexture*> {
122public:
123    TextDropShadowCache();
124    TextDropShadowCache(uint32_t maxByteSize);
125    ~TextDropShadowCache();
126
127    /**
128     * Used as a callback when an entry is removed from the cache.
129     * Do not invoke directly.
130     */
131    void operator()(ShadowText& text, ShadowTexture*& texture) override;
132
133    ShadowTexture* get(const SkPaint* paint, const glyph_t* text,
134            int numGlyphs, float radius, const float* positions);
135
136    /**
137     * Clears the cache. This causes all textures to be deleted.
138     */
139    void clear();
140
141    void setFontRenderer(FontRenderer& fontRenderer) {
142        mRenderer = &fontRenderer;
143    }
144
145    /**
146     * Returns the maximum size of the cache in bytes.
147     */
148    uint32_t getMaxSize();
149    /**
150     * Returns the current size of the cache in bytes.
151     */
152    uint32_t getSize();
153
154private:
155    LruCache<ShadowText, ShadowTexture*> mCache;
156
157    uint32_t mSize;
158    const uint32_t mMaxSize;
159    FontRenderer* mRenderer = nullptr;
160    bool mDebugEnabled;
161}; // class TextDropShadowCache
162
163}; // namespace uirenderer
164}; // namespace android
165
166#endif // ANDROID_HWUI_TEXT_DROP_SHADOW_CACHE_H
167