PathCache.cpp revision 059e12ccd20f5c249724a8362d6bac325334ea76 
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/threads.h>
20
21#include "PathCache.h"
22#include "Properties.h"
23
24namespace android {
25namespace uirenderer {
26
27// Defined in ShapeCache.h
28
29void computePathBounds(const SkPath* path, const SkPaint* paint,
30        float& left, float& top, float& offset, uint32_t& width, uint32_t& height) {
31    const SkRect& bounds = path->getBounds();
32    computeBounds(bounds, paint, left, top, offset, width, height);
33}
34
35void computeBounds(const SkRect& bounds, const SkPaint* paint,
36        float& left, float& top, float& offset, uint32_t& width, uint32_t& height) {
37    const float pathWidth = fmax(bounds.width(), 1.0f);
38    const float pathHeight = fmax(bounds.height(), 1.0f);
39
40    left = bounds.fLeft;
41    top = bounds.fTop;
42
43    offset = (int) floorf(fmax(paint->getStrokeWidth(), 1.0f) * 1.5f + 0.5f);
44
45    width = uint32_t(pathWidth + offset * 2.0 + 0.5);
46    height = uint32_t(pathHeight + offset * 2.0 + 0.5);
47}
48
49///////////////////////////////////////////////////////////////////////////////
50// Path cache
51///////////////////////////////////////////////////////////////////////////////
52
53PathCache::PathCache(): ShapeCache<PathCacheEntry>("path",
54        PROPERTY_PATH_CACHE_SIZE, DEFAULT_PATH_CACHE_SIZE) {
55}
56
57void PathCache::remove(SkPath* path) {
58    Vector<PathCacheEntry> pathsToRemove;
59    LruCache<PathCacheEntry, PathTexture*>::Iterator i(mCache);
60
61    while (i.next()) {
62        const PathCacheEntry& key = i.key();
63        if (key.path == path) {
64            pathsToRemove.push(key);
65        }
66    }
67
68    for (size_t i = 0; i < pathsToRemove.size(); i++) {
69        mCache.remove(pathsToRemove.itemAt(i));
70    }
71}
72
73void PathCache::removeDeferred(SkPath* path) {
74    Mutex::Autolock _l(mLock);
75    mGarbage.push(path);
76}
77
78void PathCache::clearGarbage() {
79    Mutex::Autolock _l(mLock);
80    size_t count = mGarbage.size();
81    for (size_t i = 0; i < count; i++) {
82        remove(mGarbage.itemAt(i));
83    }
84    mGarbage.clear();
85}
86
87PathTexture* PathCache::get(SkPath* path, SkPaint* paint) {
88    const SkPath* sourcePath = path->getSourcePath();
89    if (sourcePath && sourcePath->getGenerationID() == path->getGenerationID()) {
90        path = const_cast<SkPath*>(sourcePath);
91    }
92
93    PathCacheEntry entry(path, paint);
94    PathTexture* texture = mCache.get(entry);
95
96    float left, top, offset;
97    uint32_t width, height;
98
99    if (!texture) {
100        texture = addTexture(entry, path, paint);
101    } else if (path->getGenerationID() != texture->generation) {
102        mCache.remove(entry);
103        texture = addTexture(entry, path, paint);
104    }
105
106    return texture;
107}
108
109}; // namespace uirenderer
110}; // namespace android
111