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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 = src->mPicture;
     31         } else if (NULL != src->mRecorder.get()) {
     32             mPicture = src->makePartialCopy();
     33         }
     34     } else {
     35         mWidth = 0;
     36         mHeight = 0;
     37     }
     38 }
     39 
     40 Canvas* 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(SkIntToScalar(width), SkIntToScalar(height));
     46     return Canvas::create_canvas(canvas);
     47 }
     48 
     49 void Picture::endRecording() {
     50     if (NULL != mRecorder.get()) {
     51         mPicture = mRecorder->finishRecordingAsPicture();
     52         mRecorder.reset(NULL);
     53     }
     54 }
     55 
     56 int Picture::width() const {
     57     return mWidth;
     58 }
     59 
     60 int Picture::height() const {
     61     return mHeight;
     62 }
     63 
     64 Picture* Picture::CreateFromStream(SkStream* stream) {
     65     Picture* newPict = new Picture;
     66 
     67     sk_sp<SkPicture> skPicture = SkPicture::MakeFromStream(stream);
     68     if (NULL != skPicture) {
     69         newPict->mPicture = skPicture;
     70 
     71         const SkIRect cullRect = skPicture->cullRect().roundOut();
     72         newPict->mWidth = cullRect.width();
     73         newPict->mHeight = cullRect.height();
     74     }
     75 
     76     return newPict;
     77 }
     78 
     79 void Picture::serialize(SkWStream* stream) const {
     80     if (NULL != mRecorder.get()) {
     81         this->makePartialCopy()->serialize(stream);
     82     } else if (NULL != mPicture.get()) {
     83         mPicture->serialize(stream);
     84     } else {
     85         // serialize "empty" picture
     86         SkPictureRecorder recorder;
     87         recorder.beginRecording(0, 0);
     88         recorder.finishRecordingAsPicture()->serialize(stream);
     89     }
     90 }
     91 
     92 void Picture::draw(Canvas* canvas) {
     93     if (NULL != mRecorder.get()) {
     94         this->endRecording();
     95         SkASSERT(NULL != mPicture.get());
     96     }
     97     if (NULL != mPicture.get()) {
     98         mPicture->playback(canvas->asSkCanvas());
     99     }
    100 }
    101 
    102 sk_sp<SkPicture> Picture::makePartialCopy() const {
    103     SkASSERT(NULL != mRecorder.get());
    104 
    105     SkPictureRecorder reRecorder;
    106 
    107     SkCanvas* canvas = reRecorder.beginRecording(mWidth, mHeight, NULL, 0);
    108     mRecorder->partialReplay(canvas);
    109     return reRecorder.finishRecordingAsPicture();
    110 }
    111 
    112 }; // namespace android
    113