Picture.cpp revision f5d6c555c3430f6e423952ba3ab024380e550bba 
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
20#include "SkStream.h"
21
22namespace android {
23
24Picture::Picture(const Picture* src) {
25    if (NULL != src) {
26        mWidth = src->width();
27        mHeight = src->height();
28        if (NULL != src->mPicture.get()) {
29            mPicture.reset(SkRef(src->mPicture.get()));
30        } if (NULL != src->mRecorder.get()) {
31            mPicture.reset(src->makePartialCopy());
32        }
33    } else {
34        mWidth = 0;
35        mHeight = 0;
36    }
37}
38
39Canvas* Picture::beginRecording(int width, int height) {
40    mPicture.reset(NULL);
41    mRecorder.reset(new SkPictureRecorder);
42    mWidth = width;
43    mHeight = height;
44    SkCanvas* canvas = mRecorder->beginRecording(width, height, NULL, 0);
45    return Canvas::create_canvas(canvas);
46}
47
48void Picture::endRecording() {
49    if (NULL != mRecorder.get()) {
50        mPicture.reset(mRecorder->endRecording());
51        mRecorder.reset(NULL);
52    }
53}
54
55int Picture::width() const {
56    if (NULL != mPicture.get()) {
57        SkASSERT(mPicture->width() == mWidth);
58        SkASSERT(mPicture->height() == mHeight);
59    }
60
61    return mWidth;
62}
63
64int Picture::height() const {
65    if (NULL != mPicture.get()) {
66        SkASSERT(mPicture->width() == mWidth);
67        SkASSERT(mPicture->height() == mHeight);
68    }
69
70    return mHeight;
71}
72
73Picture* Picture::CreateFromStream(SkStream* stream) {
74    Picture* newPict = new Picture;
75
76    newPict->mPicture.reset(SkPicture::CreateFromStream(stream));
77    if (NULL != newPict->mPicture.get()) {
78        newPict->mWidth = newPict->mPicture->width();
79        newPict->mHeight = newPict->mPicture->height();
80    }
81
82    return newPict;
83}
84
85void Picture::serialize(SkWStream* stream) const {
86    if (NULL != mRecorder.get()) {
87        SkAutoTDelete<SkPicture> tempPict(this->makePartialCopy());
88        tempPict->serialize(stream);
89    } else if (NULL != mPicture.get()) {
90        mPicture->serialize(stream);
91    } else {
92        SkPicture empty;
93        empty.serialize(stream);
94    }
95}
96
97void Picture::draw(Canvas* canvas) {
98    if (NULL != mRecorder.get()) {
99        this->endRecording();
100        SkASSERT(NULL != mPicture.get());
101    }
102    if (NULL != mPicture.get()) {
103        // TODO: remove this const_cast once pictures are immutable
104        const_cast<SkPicture*>(mPicture.get())->draw(canvas->getSkCanvas());
105    }
106}
107
108SkPicture* Picture::makePartialCopy() const {
109    SkASSERT(NULL != mRecorder.get());
110
111    SkPictureRecorder reRecorder;
112
113    SkCanvas* canvas = reRecorder.beginRecording(mWidth, mHeight, NULL, 0);
114    mRecorder->partialReplay(canvas);
115    return reRecorder.endRecording();
116}
117
118}; // namespace android
119