PathCache.cpp revision 4bcb7467a174ed03a67b0c62950c555813ddf00d 
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
28void computePathBounds(const SkPath *path, const SkPaint* paint,
29        float& left, float& top, float& offset, uint32_t& width, uint32_t& height) {
30    const SkRect& bounds = path->getBounds();
31
32    const float pathWidth = fmax(bounds.width(), 1.0f);
33    const float pathHeight = fmax(bounds.height(), 1.0f);
34
35    left = bounds.fLeft;
36    top = bounds.fTop;
37
38    offset = (int) floorf(fmax(paint->getStrokeWidth(), 1.0f) * 1.5f + 0.5f);
39
40    width = uint32_t(pathWidth + offset * 2.0 + 0.5);
41    height = uint32_t(pathHeight + offset * 2.0 + 0.5);
42}
43
44///////////////////////////////////////////////////////////////////////////////
45// Path cache
46///////////////////////////////////////////////////////////////////////////////
47
48PathCache::PathCache(): ShapeCache<PathCacheEntry>("path",
49        PROPERTY_PATH_CACHE_SIZE, DEFAULT_PATH_CACHE_SIZE) {
50}
51
52void PathCache::remove(SkPath* path) {
53    // TODO: Linear search...
54    Vector<size_t> pathsToRemove;
55    for (size_t i = 0; i < mCache.size(); i++) {
56        if (mCache.getKeyAt(i).path == path) {
57            pathsToRemove.push(i);
58            removeTexture(mCache.getValueAt(i));
59        }
60    }
61
62    mCache.setOnEntryRemovedListener(NULL);
63    for (size_t i = 0; i < pathsToRemove.size(); i++) {
64        // This will work because pathsToRemove is sorted
65        // and because the cache is a sorted keyed vector
66        mCache.removeAt(pathsToRemove.itemAt(i) - i);
67    }
68    mCache.setOnEntryRemovedListener(this);
69}
70
71void PathCache::removeDeferred(SkPath* path) {
72    Mutex::Autolock _l(mLock);
73    mGarbage.push(path);
74}
75
76void PathCache::clearGarbage() {
77    Mutex::Autolock _l(mLock);
78    size_t count = mGarbage.size();
79    for (size_t i = 0; i < count; i++) {
80        remove(mGarbage.itemAt(i));
81    }
82    mGarbage.clear();
83}
84
85PathTexture* PathCache::get(SkPath* path, SkPaint* paint) {
86    const SkPath* sourcePath = path->getSourcePath();
87    if (sourcePath && sourcePath->getGenerationID() == path->getGenerationID()) {
88        path = const_cast<SkPath*>(sourcePath);
89    }
90
91    PathCacheEntry entry(path, paint);
92    PathTexture* texture = mCache.get(entry);
93
94    float left, top, offset;
95    uint32_t width, height;
96
97    if (!texture) {
98        texture = addTexture(entry, path, paint);
99    } else if (path->getGenerationID() != texture->generation) {
100        mCache.remove(entry);
101        texture = addTexture(entry, path, paint);
102    }
103
104    return texture;
105}
106
107}; // namespace uirenderer
108}; // namespace android
109