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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 "Canvas.h"
     18 #include "Picture.h"
     19 
     20 #include "SkStream.h"
     21 
     22 namespace android {
     23 
     24 Picture::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 
     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(width, height, NULL, 0);
     46     return Canvas::create_canvas(canvas);
     47 }
     48 
     49 void Picture::endRecording() {
     50     if (NULL != mRecorder.get()) {
     51         mPicture.reset(mRecorder->endRecording());
     52         validate();
     53         mRecorder.reset(NULL);
     54     }
     55 }
     56 
     57 int Picture::width() const {
     58     validate();
     59     return mWidth;
     60 }
     61 
     62 int Picture::height() const {
     63     validate();
     64     return mHeight;
     65 }
     66 
     67 Picture* 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 
     82 void 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 
     97 void 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 
    108 SkPicture* 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 void 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