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 #define LOG_TAG "OpenGLRenderer"
18
19 #include "Debug.h"
20 #include "TextDropShadowCache.h"
21 #include "Properties.h"
22
23 namespace android {
24 namespace uirenderer {
25
26 ///////////////////////////////////////////////////////////////////////////////
27 // Constructors/destructor
28 ///////////////////////////////////////////////////////////////////////////////
29
TextDropShadowCache()30 TextDropShadowCache::TextDropShadowCache():
31 mCache(GenerationCache<ShadowText, ShadowTexture*>::kUnlimitedCapacity),
32 mSize(0), mMaxSize(MB(DEFAULT_DROP_SHADOW_CACHE_SIZE)) {
33 char property[PROPERTY_VALUE_MAX];
34 if (property_get(PROPERTY_DROP_SHADOW_CACHE_SIZE, property, NULL) > 0) {
35 INIT_LOGD(" Setting drop shadow cache size to %sMB", property);
36 setMaxSize(MB(atof(property)));
37 } else {
38 INIT_LOGD(" Using default drop shadow cache size of %.2fMB",
39 DEFAULT_DROP_SHADOW_CACHE_SIZE);
40 }
41
42 init();
43 }
44
TextDropShadowCache(uint32_t maxByteSize)45 TextDropShadowCache::TextDropShadowCache(uint32_t maxByteSize):
46 mCache(GenerationCache<ShadowText, ShadowTexture*>::kUnlimitedCapacity),
47 mSize(0), mMaxSize(maxByteSize) {
48 init();
49 }
50
~TextDropShadowCache()51 TextDropShadowCache::~TextDropShadowCache() {
52 mCache.clear();
53 }
54
init()55 void TextDropShadowCache::init() {
56 mCache.setOnEntryRemovedListener(this);
57 mDebugEnabled = readDebugLevel() & kDebugMoreCaches;
58 }
59
60 ///////////////////////////////////////////////////////////////////////////////
61 // Size management
62 ///////////////////////////////////////////////////////////////////////////////
63
getSize()64 uint32_t TextDropShadowCache::getSize() {
65 return mSize;
66 }
67
getMaxSize()68 uint32_t TextDropShadowCache::getMaxSize() {
69 return mMaxSize;
70 }
71
setMaxSize(uint32_t maxSize)72 void TextDropShadowCache::setMaxSize(uint32_t maxSize) {
73 mMaxSize = maxSize;
74 while (mSize > mMaxSize) {
75 mCache.removeOldest();
76 }
77 }
78
79 ///////////////////////////////////////////////////////////////////////////////
80 // Callbacks
81 ///////////////////////////////////////////////////////////////////////////////
82
operator ()(ShadowText & text,ShadowTexture * & texture)83 void TextDropShadowCache::operator()(ShadowText& text, ShadowTexture*& texture) {
84 if (texture) {
85 mSize -= texture->bitmapSize;
86
87 if (mDebugEnabled) {
88 ALOGD("Shadow texture deleted, size = %d", texture->bitmapSize);
89 }
90
91 glDeleteTextures(1, &texture->id);
92 delete texture;
93 }
94 }
95
96 ///////////////////////////////////////////////////////////////////////////////
97 // Caching
98 ///////////////////////////////////////////////////////////////////////////////
99
clear()100 void TextDropShadowCache::clear() {
101 mCache.clear();
102 }
103
get(SkPaint * paint,const char * text,uint32_t len,int numGlyphs,uint32_t radius,const float * positions)104 ShadowTexture* TextDropShadowCache::get(SkPaint* paint, const char* text, uint32_t len,
105 int numGlyphs, uint32_t radius, const float* positions) {
106 ShadowText entry(paint, radius, len, text, positions);
107 ShadowTexture* texture = mCache.get(entry);
108
109 if (!texture) {
110 SkPaint paintCopy(*paint);
111 paintCopy.setTextAlign(SkPaint::kLeft_Align);
112 FontRenderer::DropShadow shadow = mRenderer->renderDropShadow(&paintCopy, text, 0,
113 len, numGlyphs, radius, positions);
114
115 texture = new ShadowTexture;
116 texture->left = shadow.penX;
117 texture->top = shadow.penY;
118 texture->width = shadow.width;
119 texture->height = shadow.height;
120 texture->generation = 0;
121 texture->blend = true;
122
123 const uint32_t size = shadow.width * shadow.height;
124 texture->bitmapSize = size;
125
126 // Don't even try to cache a bitmap that's bigger than the cache
127 if (size < mMaxSize) {
128 while (mSize + size > mMaxSize) {
129 mCache.removeOldest();
130 }
131 }
132
133 glGenTextures(1, &texture->id);
134
135 glBindTexture(GL_TEXTURE_2D, texture->id);
136 // Textures are Alpha8
137 glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
138
139 glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, texture->width, texture->height, 0,
140 GL_ALPHA, GL_UNSIGNED_BYTE, shadow.image);
141
142 texture->setFilter(GL_LINEAR);
143 texture->setWrap(GL_CLAMP_TO_EDGE);
144
145 if (size < mMaxSize) {
146 if (mDebugEnabled) {
147 ALOGD("Shadow texture created, size = %d", texture->bitmapSize);
148 }
149
150 entry.copyTextLocally();
151
152 mSize += size;
153 mCache.put(entry, texture);
154 } else {
155 texture->cleanup = true;
156 }
157
158 // Cleanup shadow
159 delete[] shadow.image;
160 }
161
162 return texture;
163 }
164
165 }; // namespace uirenderer
166 }; // namespace android
167