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 <utils/JenkinsHash.h>
20
21#include "Caches.h"
22#include "Debug.h"
23#include "FontRenderer.h"
24#include "TextDropShadowCache.h"
25#include "Properties.h"
26
27namespace android {
28namespace uirenderer {
29
30///////////////////////////////////////////////////////////////////////////////
31// Cache support
32///////////////////////////////////////////////////////////////////////////////
33
34hash_t ShadowText::hash() const {
35    uint32_t charCount = len / sizeof(char16_t);
36    uint32_t hash = JenkinsHashMix(0, len);
37    hash = JenkinsHashMix(hash, android::hash_type(radius));
38    hash = JenkinsHashMix(hash, android::hash_type(textSize));
39    hash = JenkinsHashMix(hash, android::hash_type(typeface));
40    hash = JenkinsHashMix(hash, flags);
41    hash = JenkinsHashMix(hash, android::hash_type(italicStyle));
42    hash = JenkinsHashMix(hash, android::hash_type(scaleX));
43    if (text) {
44        hash = JenkinsHashMixShorts(
45            hash, reinterpret_cast<const uint16_t*>(text), charCount);
46    }
47    if (positions) {
48        for (uint32_t i = 0; i < charCount * 2; i++) {
49            hash = JenkinsHashMix(hash, android::hash_type(positions[i]));
50        }
51    }
52    return JenkinsHashWhiten(hash);
53}
54
55int ShadowText::compare(const ShadowText& lhs, const ShadowText& rhs) {
56    int deltaInt = int(lhs.len) - int(rhs.len);
57    if (deltaInt != 0) return deltaInt;
58
59    deltaInt = lhs.flags - rhs.flags;
60    if (deltaInt != 0) return deltaInt;
61
62    if (lhs.radius < rhs.radius) return -1;
63    if (lhs.radius > rhs.radius) return +1;
64
65    if (lhs.typeface < rhs.typeface) return -1;
66    if (lhs.typeface > rhs.typeface) return +1;
67
68    if (lhs.textSize < rhs.textSize) return -1;
69    if (lhs.textSize > rhs.textSize) return +1;
70
71    if (lhs.italicStyle < rhs.italicStyle) return -1;
72    if (lhs.italicStyle > rhs.italicStyle) return +1;
73
74    if (lhs.scaleX < rhs.scaleX) return -1;
75    if (lhs.scaleX > rhs.scaleX) return +1;
76
77    if (lhs.text != rhs.text) {
78        if (!lhs.text) return -1;
79        if (!rhs.text) return +1;
80
81        deltaInt = memcmp(lhs.text, rhs.text, lhs.len);
82        if (deltaInt != 0) return deltaInt;
83    }
84
85    if (lhs.positions != rhs.positions) {
86        if (!lhs.positions) return -1;
87        if (!rhs.positions) return +1;
88
89        return memcmp(lhs.positions, rhs.positions, lhs.len << 2);
90    }
91
92    return 0;
93}
94
95///////////////////////////////////////////////////////////////////////////////
96// Constructors/destructor
97///////////////////////////////////////////////////////////////////////////////
98
99TextDropShadowCache::TextDropShadowCache():
100        mCache(LruCache<ShadowText, ShadowTexture*>::kUnlimitedCapacity),
101        mSize(0), mMaxSize(MB(DEFAULT_DROP_SHADOW_CACHE_SIZE)) {
102    char property[PROPERTY_VALUE_MAX];
103    if (property_get(PROPERTY_DROP_SHADOW_CACHE_SIZE, property, nullptr) > 0) {
104        INIT_LOGD("  Setting drop shadow cache size to %sMB", property);
105        setMaxSize(MB(atof(property)));
106    } else {
107        INIT_LOGD("  Using default drop shadow cache size of %.2fMB",
108                DEFAULT_DROP_SHADOW_CACHE_SIZE);
109    }
110
111    init();
112}
113
114TextDropShadowCache::TextDropShadowCache(uint32_t maxByteSize):
115        mCache(LruCache<ShadowText, ShadowTexture*>::kUnlimitedCapacity),
116        mSize(0), mMaxSize(maxByteSize) {
117    init();
118}
119
120TextDropShadowCache::~TextDropShadowCache() {
121    mCache.clear();
122}
123
124void TextDropShadowCache::init() {
125    mCache.setOnEntryRemovedListener(this);
126    mDebugEnabled = Properties::debugLevel & kDebugMoreCaches;
127}
128
129///////////////////////////////////////////////////////////////////////////////
130// Size management
131///////////////////////////////////////////////////////////////////////////////
132
133uint32_t TextDropShadowCache::getSize() {
134    return mSize;
135}
136
137uint32_t TextDropShadowCache::getMaxSize() {
138    return mMaxSize;
139}
140
141void TextDropShadowCache::setMaxSize(uint32_t maxSize) {
142    mMaxSize = maxSize;
143    while (mSize > mMaxSize) {
144        mCache.removeOldest();
145    }
146}
147
148///////////////////////////////////////////////////////////////////////////////
149// Callbacks
150///////////////////////////////////////////////////////////////////////////////
151
152void TextDropShadowCache::operator()(ShadowText&, ShadowTexture*& texture) {
153    if (texture) {
154        mSize -= texture->bitmapSize;
155
156        if (mDebugEnabled) {
157            ALOGD("Shadow texture deleted, size = %d", texture->bitmapSize);
158        }
159
160        texture->deleteTexture();
161        delete texture;
162    }
163}
164
165///////////////////////////////////////////////////////////////////////////////
166// Caching
167///////////////////////////////////////////////////////////////////////////////
168
169void TextDropShadowCache::clear() {
170    mCache.clear();
171}
172
173ShadowTexture* TextDropShadowCache::get(const SkPaint* paint, const char* text, uint32_t len,
174        int numGlyphs, float radius, const float* positions) {
175    ShadowText entry(paint, radius, len, text, positions);
176    ShadowTexture* texture = mCache.get(entry);
177
178    if (!texture) {
179        SkPaint paintCopy(*paint);
180        paintCopy.setTextAlign(SkPaint::kLeft_Align);
181        FontRenderer::DropShadow shadow = mRenderer->renderDropShadow(&paintCopy, text, 0,
182                len, numGlyphs, radius, positions);
183
184        if (!shadow.image) {
185            return nullptr;
186        }
187
188        Caches& caches = Caches::getInstance();
189
190        texture = new ShadowTexture(caches);
191        texture->left = shadow.penX;
192        texture->top = shadow.penY;
193        texture->width = shadow.width;
194        texture->height = shadow.height;
195        texture->generation = 0;
196        texture->blend = true;
197
198        const uint32_t size = shadow.width * shadow.height;
199        texture->bitmapSize = size;
200
201        // Don't even try to cache a bitmap that's bigger than the cache
202        if (size < mMaxSize) {
203            while (mSize + size > mMaxSize) {
204                mCache.removeOldest();
205            }
206        }
207
208        glGenTextures(1, &texture->id);
209
210        caches.textureState().bindTexture(texture->id);
211        // Textures are Alpha8
212        glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
213
214        glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, texture->width, texture->height, 0,
215                GL_ALPHA, GL_UNSIGNED_BYTE, shadow.image);
216
217        texture->setFilter(GL_LINEAR);
218        texture->setWrap(GL_CLAMP_TO_EDGE);
219
220        if (size < mMaxSize) {
221            if (mDebugEnabled) {
222                ALOGD("Shadow texture created, size = %d", texture->bitmapSize);
223            }
224
225            entry.copyTextLocally();
226
227            mSize += size;
228            mCache.put(entry, texture);
229        } else {
230            texture->cleanup = true;
231        }
232
233        // Cleanup shadow
234        free(shadow.image);
235    }
236
237    return texture;
238}
239
240}; // namespace uirenderer
241}; // namespace android
242