Picture.cpp revision b3d50e007523d1ada0866d384c391c72ac1a3577 
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        } else if (NULL != src->mRecorder.get()) {
31            mPicture.reset(src->makePartialCopy());
32        }
33        validate();
34    } else {
35        mWidth = 0;
36        mHeight = 0;
37    }
38}
39
40Canvas* Picture::beginRecording(int width, int height) {
41    mPicture.reset(NULL);
42    mRecorder.reset(new SkPictureRecorder);
43    mWidth = width;
44    mHeight = height;
45    SkCanvas* canvas = mRecorder->beginRecording(width, height, NULL, 0);
46    return Canvas::create_canvas(canvas);
47}
48
49void Picture::endRecording() {
50    if (NULL != mRecorder.get()) {
51        mPicture.reset(mRecorder->endRecording());
52        validate();
53        mRecorder.reset(NULL);
54    }
55}
56
57int Picture::width() const {
58    validate();
59    return mWidth;
60}
61
62int Picture::height() const {
63    validate();
64    return mHeight;
65}
66
67Picture* Picture::CreateFromStream(SkStream* stream) {
68    Picture* newPict = new Picture;
69
70    SkPicture* skPicture = SkPicture::CreateFromStream(stream);
71    if (NULL != skPicture) {
72        newPict->mPicture.reset(skPicture);
73
74        const SkIRect cullRect = skPicture->cullRect().roundOut();
75        newPict->mWidth = cullRect.width();
76        newPict->mHeight = cullRect.height();
77    }
78
79    return newPict;
80}
81
82void Picture::serialize(SkWStream* stream) const {
83    if (NULL != mRecorder.get()) {
84        SkAutoTDelete<SkPicture> tempPict(this->makePartialCopy());
85        tempPict->serialize(stream);
86    } else if (NULL != mPicture.get()) {
87        validate();
88        mPicture->serialize(stream);
89    } else {
90        SkPictureRecorder recorder;
91        recorder.beginRecording(0, 0);
92        SkAutoTUnref<SkPicture> empty(recorder.endRecording());
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    validate();
103    if (NULL != mPicture.get()) {
104        mPicture.get()->playback(canvas->asSkCanvas());
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
118void Picture::validate() const {
119#ifdef SK_DEBUG
120    if (NULL != mPicture.get()) {
121        SkRect cullRect = mPicture->cullRect();
122        SkRect myRect = SkRect::MakeWH(SkIntToScalar(mWidth), SkIntToScalar(mHeight));
123        SkASSERT(cullRect == myRect);
124    }
125#endif
126}
127
128}; // namespace android
129