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      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 "Picture.h"
     18 #include "SkStream.h"
     19 
     20 #include <memory>
     21 #include <hwui/Canvas.h>
     22 
     23 namespace android {
     24 
     25 Picture::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 
     41 Canvas* 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 
     50 void Picture::endRecording() {
     51     if (NULL != mRecorder.get()) {
     52         mPicture.reset(mRecorder->endRecording());
     53         validate();
     54         mRecorder.reset(NULL);
     55     }
     56 }
     57 
     58 int Picture::width() const {
     59     validate();
     60     return mWidth;
     61 }
     62 
     63 int Picture::height() const {
     64     validate();
     65     return mHeight;
     66 }
     67 
     68 Picture* 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 
     83 void 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 
     98 void 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 
    109 SkPicture* 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 
    119 void 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