Picture.cpp revision afbd0f1fef46ef0ddf633dfde0de724db3da1405 
1/*
2 * Copyright (C) 2014 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 "Canvas.h"
18#include "Picture.h"
19#include "SkStream.h"
20
21#include <memory>
22
23namespace android {
24
25Picture::Picture(const Picture* src) {
26    if (NULL != src) {
27        mWidth = src->width();
28        mHeight = src->height();
29        if (NULL != src->mPicture.get()) {
30            mPicture.reset(SkRef(src->mPicture.get()));
31        } else if (NULL != src->mRecorder.get()) {
32            mPicture.reset(src->makePartialCopy());
33        }
34        validate();
35    } else {
36        mWidth = 0;
37        mHeight = 0;
38    }
39}
40
41Canvas* Picture::beginRecording(int width, int height) {
42    mPicture.reset(NULL);
43    mRecorder.reset(new SkPictureRecorder);
44    mWidth = width;
45    mHeight = height;
46    SkCanvas* canvas = mRecorder->beginRecording(width, height, NULL, 0);
47    return Canvas::create_canvas(canvas);
48}
49
50void Picture::endRecording() {
51    if (NULL != mRecorder.get()) {
52        mPicture.reset(mRecorder->endRecording());
53        validate();
54        mRecorder.reset(NULL);
55    }
56}
57
58int Picture::width() const {
59    validate();
60    return mWidth;
61}
62
63int Picture::height() const {
64    validate();
65    return mHeight;
66}
67
68Picture* Picture::CreateFromStream(SkStream* stream) {
69    Picture* newPict = new Picture;
70
71    SkPicture* skPicture = SkPicture::CreateFromStream(stream);
72    if (NULL != skPicture) {
73        newPict->mPicture.reset(skPicture);
74
75        const SkIRect cullRect = skPicture->cullRect().roundOut();
76        newPict->mWidth = cullRect.width();
77        newPict->mHeight = cullRect.height();
78    }
79
80    return newPict;
81}
82
83void Picture::serialize(SkWStream* stream) const {
84    if (NULL != mRecorder.get()) {
85        std::unique_ptr<SkPicture> tempPict(this->makePartialCopy());
86        tempPict->serialize(stream);
87    } else if (NULL != mPicture.get()) {
88        validate();
89        mPicture->serialize(stream);
90    } else {
91        SkPictureRecorder recorder;
92        recorder.beginRecording(0, 0);
93        std::unique_ptr<SkPicture> empty(recorder.endRecording());
94        empty->serialize(stream);
95    }
96}
97
98void Picture::draw(Canvas* canvas) {
99    if (NULL != mRecorder.get()) {
100        this->endRecording();
101        SkASSERT(NULL != mPicture.get());
102    }
103    validate();
104    if (NULL != mPicture.get()) {
105        mPicture.get()->playback(canvas->asSkCanvas());
106    }
107}
108
109SkPicture* Picture::makePartialCopy() const {
110    SkASSERT(NULL != mRecorder.get());
111
112    SkPictureRecorder reRecorder;
113
114    SkCanvas* canvas = reRecorder.beginRecording(mWidth, mHeight, NULL, 0);
115    mRecorder->partialReplay(canvas);
116    return reRecorder.endRecording();
117}
118
119void Picture::validate() const {
120#ifdef SK_DEBUG
121    if (NULL != mPicture.get()) {
122        SkRect cullRect = mPicture->cullRect();
123        SkRect myRect = SkRect::MakeWH(SkIntToScalar(mWidth), SkIntToScalar(mHeight));
124        SkASSERT(cullRect == myRect);
125    }
126#endif
127}
128
129}; // namespace android
130