TextDropShadowCache.cpp revision 5a4690bf26932c0d6940e4af8516d920e09ae81a 
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#include <utils/JenkinsHash.h>
18
19#include "Caches.h"
20#include "Debug.h"
21#include "FontRenderer.h"
22#include "TextDropShadowCache.h"
23#include "Properties.h"
24
25namespace android {
26namespace uirenderer {
27
28///////////////////////////////////////////////////////////////////////////////
29// Cache support
30///////////////////////////////////////////////////////////////////////////////
31
32hash_t ShadowText::hash() const {
33    uint32_t charCount = len / sizeof(char16_t);
34    uint32_t hash = JenkinsHashMix(0, len);
35    hash = JenkinsHashMix(hash, android::hash_type(radius));
36    hash = JenkinsHashMix(hash, android::hash_type(textSize));
37    hash = JenkinsHashMix(hash, android::hash_type(typeface));
38    hash = JenkinsHashMix(hash, flags);
39    hash = JenkinsHashMix(hash, android::hash_type(italicStyle));
40    hash = JenkinsHashMix(hash, android::hash_type(scaleX));
41    if (text) {
42        hash = JenkinsHashMixShorts(
43            hash, reinterpret_cast<const uint16_t*>(text), charCount);
44    }
45    if (positions) {
46        for (uint32_t i = 0; i < charCount * 2; i++) {
47            hash = JenkinsHashMix(hash, android::hash_type(positions[i]));
48        }
49    }
50    return JenkinsHashWhiten(hash);
51}
52
53int ShadowText::compare(const ShadowText& lhs, const ShadowText& rhs) {
54    int deltaInt = int(lhs.len) - int(rhs.len);
55    if (deltaInt != 0) return deltaInt;
56
57    deltaInt = lhs.flags - rhs.flags;
58    if (deltaInt != 0) return deltaInt;
59
60    if (lhs.radius < rhs.radius) return -1;
61    if (lhs.radius > rhs.radius) return +1;
62
63    if (lhs.typeface < rhs.typeface) return -1;
64    if (lhs.typeface > rhs.typeface) return +1;
65
66    if (lhs.textSize < rhs.textSize) return -1;
67    if (lhs.textSize > rhs.textSize) return +1;
68
69    if (lhs.italicStyle < rhs.italicStyle) return -1;
70    if (lhs.italicStyle > rhs.italicStyle) return +1;
71
72    if (lhs.scaleX < rhs.scaleX) return -1;
73    if (lhs.scaleX > rhs.scaleX) return +1;
74
75    if (lhs.text != rhs.text) {
76        if (!lhs.text) return -1;
77        if (!rhs.text) return +1;
78
79        deltaInt = memcmp(lhs.text, rhs.text, lhs.len);
80        if (deltaInt != 0) return deltaInt;
81    }
82
83    if (lhs.positions != rhs.positions) {
84        if (!lhs.positions) return -1;
85        if (!rhs.positions) return +1;
86
87        return memcmp(lhs.positions, rhs.positions, lhs.len << 2);
88    }
89
90    return 0;
91}
92
93///////////////////////////////////////////////////////////////////////////////
94// Constructors/destructor
95///////////////////////////////////////////////////////////////////////////////
96
97TextDropShadowCache::TextDropShadowCache():
98        mCache(LruCache<ShadowText, ShadowTexture*>::kUnlimitedCapacity),
99        mSize(0), mMaxSize(MB(DEFAULT_DROP_SHADOW_CACHE_SIZE)) {
100    char property[PROPERTY_VALUE_MAX];
101    if (property_get(PROPERTY_DROP_SHADOW_CACHE_SIZE, property, nullptr) > 0) {
102        INIT_LOGD("  Setting drop shadow cache size to %sMB", property);
103        setMaxSize(MB(atof(property)));
104    } else {
105        INIT_LOGD("  Using default drop shadow cache size of %.2fMB",
106                DEFAULT_DROP_SHADOW_CACHE_SIZE);
107    }
108
109    init();
110}
111
112TextDropShadowCache::TextDropShadowCache(uint32_t maxByteSize):
113        mCache(LruCache<ShadowText, ShadowTexture*>::kUnlimitedCapacity),
114        mSize(0), mMaxSize(maxByteSize) {
115    init();
116}
117
118TextDropShadowCache::~TextDropShadowCache() {
119    mCache.clear();
120}
121
122void TextDropShadowCache::init() {
123    mCache.setOnEntryRemovedListener(this);
124    mDebugEnabled = Properties::debugLevel & kDebugMoreCaches;
125}
126
127///////////////////////////////////////////////////////////////////////////////
128// Size management
129///////////////////////////////////////////////////////////////////////////////
130
131uint32_t TextDropShadowCache::getSize() {
132    return mSize;
133}
134
135uint32_t TextDropShadowCache::getMaxSize() {
136    return mMaxSize;
137}
138
139void TextDropShadowCache::setMaxSize(uint32_t maxSize) {
140    mMaxSize = maxSize;
141    while (mSize > mMaxSize) {
142        mCache.removeOldest();
143    }
144}
145
146///////////////////////////////////////////////////////////////////////////////
147// Callbacks
148///////////////////////////////////////////////////////////////////////////////
149
150void TextDropShadowCache::operator()(ShadowText&, ShadowTexture*& texture) {
151    if (texture) {
152        mSize -= texture->bitmapSize;
153
154        if (mDebugEnabled) {
155            ALOGD("Shadow texture deleted, size = %d", texture->bitmapSize);
156        }
157
158        texture->deleteTexture();
159        delete texture;
160    }
161}
162
163///////////////////////////////////////////////////////////////////////////////
164// Caching
165///////////////////////////////////////////////////////////////////////////////
166
167void TextDropShadowCache::clear() {
168    mCache.clear();
169}
170
171ShadowTexture* TextDropShadowCache::get(const SkPaint* paint, const char* text, uint32_t len,
172        int numGlyphs, float radius, const float* positions) {
173    ShadowText entry(paint, radius, len, text, positions);
174    ShadowTexture* texture = mCache.get(entry);
175
176    if (!texture) {
177        SkPaint paintCopy(*paint);
178        paintCopy.setTextAlign(SkPaint::kLeft_Align);
179        FontRenderer::DropShadow shadow = mRenderer->renderDropShadow(&paintCopy, text, 0,
180                len, numGlyphs, radius, positions);
181
182        if (!shadow.image) {
183            return nullptr;
184        }
185
186        Caches& caches = Caches::getInstance();
187
188        texture = new ShadowTexture(caches);
189        texture->left = shadow.penX;
190        texture->top = shadow.penY;
191        texture->width = shadow.width;
192        texture->height = shadow.height;
193        texture->generation = 0;
194        texture->blend = true;
195
196        const uint32_t size = shadow.width * shadow.height;
197        texture->bitmapSize = size;
198
199        // Don't even try to cache a bitmap that's bigger than the cache
200        if (size < mMaxSize) {
201            while (mSize + size > mMaxSize) {
202                mCache.removeOldest();
203            }
204        }
205
206        glGenTextures(1, &texture->id);
207
208        caches.textureState().bindTexture(texture->id);
209        // Textures are Alpha8
210        glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
211
212        glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, texture->width, texture->height, 0,
213                GL_ALPHA, GL_UNSIGNED_BYTE, shadow.image);
214
215        texture->setFilter(GL_LINEAR);
216        texture->setWrap(GL_CLAMP_TO_EDGE);
217
218        if (size < mMaxSize) {
219            if (mDebugEnabled) {
220                ALOGD("Shadow texture created, size = %d", texture->bitmapSize);
221            }
222
223            entry.copyTextLocally();
224
225            mSize += size;
226            mCache.put(entry, texture);
227        } else {
228            texture->cleanup = true;
229        }
230
231        // Cleanup shadow
232        free(shadow.image);
233    }
234
235    return texture;
236}
237
238}; // namespace uirenderer
239}; // namespace android
240