PathCache.cpp revision 32228288a957f3823df92365bc709ad6f42b012e 
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 <GLES2/gl2.h>
20
21#include <SkCanvas.h>
22#include <SkRect.h>
23
24#include <utils/threads.h>
25
26#include "PathCache.h"
27#include "Properties.h"
28
29namespace android {
30namespace uirenderer {
31
32///////////////////////////////////////////////////////////////////////////////
33// Constructors/destructor
34///////////////////////////////////////////////////////////////////////////////
35
36PathCache::PathCache():
37        mCache(GenerationCache<PathCacheEntry, PathTexture*>::kUnlimitedCapacity),
38        mSize(0), mMaxSize(MB(DEFAULT_PATH_CACHE_SIZE)) {
39    char property[PROPERTY_VALUE_MAX];
40    if (property_get(PROPERTY_PATH_CACHE_SIZE, property, NULL) > 0) {
41        LOGD("  Setting path cache size to %sMB", property);
42        setMaxSize(MB(atof(property)));
43    } else {
44        LOGD("  Using default path cache size of %.2fMB", DEFAULT_PATH_CACHE_SIZE);
45    }
46    init();
47}
48
49PathCache::PathCache(uint32_t maxByteSize):
50        mCache(GenerationCache<PathCacheEntry, PathTexture*>::kUnlimitedCapacity),
51        mSize(0), mMaxSize(maxByteSize) {
52    init();
53}
54
55PathCache::~PathCache() {
56    mCache.clear();
57}
58
59void PathCache::init() {
60    mCache.setOnEntryRemovedListener(this);
61
62    GLint maxTextureSize;
63    glGetIntegerv(GL_MAX_TEXTURE_SIZE, &maxTextureSize);
64    mMaxTextureSize = maxTextureSize;
65
66    mDebugEnabled = readDebugLevel() & kDebugCaches;
67}
68
69///////////////////////////////////////////////////////////////////////////////
70// Size management
71///////////////////////////////////////////////////////////////////////////////
72
73uint32_t PathCache::getSize() {
74    return mSize;
75}
76
77uint32_t PathCache::getMaxSize() {
78    return mMaxSize;
79}
80
81void PathCache::setMaxSize(uint32_t maxSize) {
82    mMaxSize = maxSize;
83    while (mSize > mMaxSize) {
84        mCache.removeOldest();
85    }
86}
87
88///////////////////////////////////////////////////////////////////////////////
89// Callbacks
90///////////////////////////////////////////////////////////////////////////////
91
92void PathCache::operator()(PathCacheEntry& path, PathTexture*& texture) {
93    removeTexture(texture);
94}
95
96///////////////////////////////////////////////////////////////////////////////
97// Caching
98///////////////////////////////////////////////////////////////////////////////
99
100void PathCache::removeTexture(PathTexture* texture) {
101    if (texture) {
102        const uint32_t size = texture->width * texture->height;
103        mSize -= size;
104
105        PATH_LOGD("PathCache::callback: delete path: name, size, mSize = %d, %d, %d",
106                texture->id, size, mSize);
107        if (mDebugEnabled) {
108            LOGD("Path deleted, size = %d", size);
109        }
110
111        glDeleteTextures(1, &texture->id);
112        delete texture;
113    }
114}
115
116void PathCache::remove(SkPath* path) {
117    // TODO: Linear search...
118    Vector<uint32_t> pathsToRemove;
119    for (uint32_t i = 0; i < mCache.size(); i++) {
120        if (mCache.getKeyAt(i).path == path) {
121            pathsToRemove.push(i);
122            removeTexture(mCache.getValueAt(i));
123        }
124    }
125
126    mCache.setOnEntryRemovedListener(NULL);
127    for (size_t i = 0; i < pathsToRemove.size(); i++) {
128        mCache.removeAt(pathsToRemove.itemAt(i));
129    }
130    mCache.setOnEntryRemovedListener(this);
131}
132
133void PathCache::removeDeferred(SkPath* path) {
134    Mutex::Autolock _l(mLock);
135    mGarbage.push(path);
136}
137
138void PathCache::clearGarbage() {
139    Mutex::Autolock _l(mLock);
140    size_t count = mGarbage.size();
141    for (size_t i = 0; i < count; i++) {
142        remove(mGarbage.itemAt(i));
143    }
144    mGarbage.clear();
145}
146
147PathTexture* PathCache::get(SkPath* path, SkPaint* paint) {
148    PathCacheEntry entry(path, paint);
149
150    PathTexture* texture = mCache.get(entry);
151
152    if (!texture) {
153        texture = addTexture(entry, path, paint);
154    } else if (path->getGenerationID() != texture->generation) {
155        mCache.remove(entry);
156        texture = addTexture(entry, path, paint);
157    }
158
159    return texture;
160}
161
162PathTexture* PathCache::addTexture(const PathCacheEntry& entry,
163        const SkPath *path, const SkPaint* paint) {
164    const SkRect& bounds = path->getBounds();
165
166    const float pathWidth = fmax(bounds.width(), 1.0f);
167    const float pathHeight = fmax(bounds.height(), 1.0f);
168
169    if (pathWidth > mMaxTextureSize || pathHeight > mMaxTextureSize) {
170        LOGW("Path too large to be rendered into a texture");
171        return NULL;
172    }
173
174    const float offset = entry.strokeWidth * 1.5f;
175    const uint32_t width = uint32_t(pathWidth + offset * 2.0 + 0.5);
176    const uint32_t height = uint32_t(pathHeight + offset * 2.0 + 0.5);
177
178    const uint32_t size = width * height;
179    // Don't even try to cache a bitmap that's bigger than the cache
180    if (size < mMaxSize) {
181        while (mSize + size > mMaxSize) {
182            mCache.removeOldest();
183        }
184    }
185
186    PathTexture* texture = new PathTexture;
187    texture->left = bounds.fLeft;
188    texture->top = bounds.fTop;
189    texture->offset = offset;
190    texture->width = width;
191    texture->height = height;
192    texture->generation = path->getGenerationID();
193
194    SkBitmap bitmap;
195    bitmap.setConfig(SkBitmap::kA8_Config, width, height);
196    bitmap.allocPixels();
197    bitmap.eraseColor(0);
198
199    SkPaint pathPaint(*paint);
200
201    // Make sure the paint is opaque, color, alpha, filter, etc.
202    // will be applied later when compositing the alpha8 texture
203    pathPaint.setColor(0xff000000);
204    pathPaint.setAlpha(255);
205    pathPaint.setColorFilter(NULL);
206    pathPaint.setMaskFilter(NULL);
207    pathPaint.setShader(NULL);
208    SkXfermode* mode = SkXfermode::Create(SkXfermode::kSrc_Mode);
209    pathPaint.setXfermode(mode)->safeUnref();
210
211    SkCanvas canvas(bitmap);
212    canvas.translate(-bounds.fLeft + offset, -bounds.fTop + offset);
213    canvas.drawPath(*path, pathPaint);
214
215    generateTexture(bitmap, texture);
216
217    if (size < mMaxSize) {
218        mSize += size;
219        PATH_LOGD("PathCache::get: create path: name, size, mSize = %d, %d, %d",
220                texture->id, size, mSize);
221        if (mDebugEnabled) {
222            LOGD("Path created, size = %d", size);
223        }
224        mCache.put(entry, texture);
225    } else {
226        texture->cleanup = true;
227    }
228
229    return texture;
230}
231
232void PathCache::clear() {
233    mCache.clear();
234}
235
236void PathCache::generateTexture(SkBitmap& bitmap, Texture* texture) {
237    SkAutoLockPixels alp(bitmap);
238    if (!bitmap.readyToDraw()) {
239        LOGE("Cannot generate texture from bitmap");
240        return;
241    }
242
243    glGenTextures(1, &texture->id);
244
245    glBindTexture(GL_TEXTURE_2D, texture->id);
246    // Textures are Alpha8
247    glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
248
249    texture->blend = true;
250    glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, texture->width, texture->height, 0,
251            GL_ALPHA, GL_UNSIGNED_BYTE, bitmap.getPixels());
252
253    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
254    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
255
256    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
257    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
258}
259
260}; // namespace uirenderer
261}; // namespace android
262