Picture.cpp revision febccd05f2e9ad2422d74fcf33ec9bc900ae83bb 
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    // the java side will wrap this guy in a Canvas.java, which will call
46    // unref in its finalizer, so we have to ref it here, so that both that
47    // Canvas.java and our picture can both be owners
48    canvas->ref();
49    return Canvas::create_canvas(canvas);
50}
51
52void Picture::endRecording() {
53    if (NULL != mRecorder.get()) {
54        mPicture.reset(mRecorder->endRecording());
55        mRecorder.reset(NULL);
56    }
57}
58
59int Picture::width() const {
60    if (NULL != mPicture.get()) {
61        SkASSERT(mPicture->width() == mWidth);
62        SkASSERT(mPicture->height() == mHeight);
63    }
64
65    return mWidth;
66}
67
68int Picture::height() const {
69    if (NULL != mPicture.get()) {
70        SkASSERT(mPicture->width() == mWidth);
71        SkASSERT(mPicture->height() == mHeight);
72    }
73
74    return mHeight;
75}
76
77Picture* Picture::CreateFromStream(SkStream* stream) {
78    Picture* newPict = new Picture;
79
80    newPict->mPicture.reset(SkPicture::CreateFromStream(stream));
81    if (NULL != newPict->mPicture.get()) {
82        newPict->mWidth = newPict->mPicture->width();
83        newPict->mHeight = newPict->mPicture->height();
84    }
85
86    return newPict;
87}
88
89void Picture::serialize(SkWStream* stream) const {
90    if (NULL != mRecorder.get()) {
91        SkAutoTDelete<SkPicture> tempPict(this->makePartialCopy());
92        tempPict->serialize(stream);
93    } else if (NULL != mPicture.get()) {
94        mPicture->serialize(stream);
95    } else {
96        SkPicture empty;
97        empty.serialize(stream);
98    }
99}
100
101void Picture::draw(Canvas* canvas) {
102    if (NULL != mRecorder.get()) {
103        this->endRecording();
104        SkASSERT(NULL != mPicture.get());
105    }
106    if (NULL != mPicture.get()) {
107        // TODO: remove this const_cast once pictures are immutable
108        const_cast<SkPicture*>(mPicture.get())->draw(canvas->getSkCanvas());
109    }
110}
111
112SkPicture* Picture::makePartialCopy() const {
113    SkASSERT(NULL != mRecorder.get());
114
115    SkPictureRecorder reRecorder;
116
117    SkCanvas* canvas = reRecorder.beginRecording(mWidth, mHeight, NULL, 0);
118    mRecorder->partialReplay(canvas);
119    return reRecorder.endRecording();
120}
121
122}; // namespace android
123