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      1 /*
      2  * Copyright 2013 Google Inc.
      3  *
      4  * Use of this source code is governed by a BSD-style license that can be
      5  * found in the LICENSE file.
      6  */
      7 
      8 #include "SkTypes.h"
      9 
     10 #ifdef SAMPLE_PDF_FILE_VIEWER
     11 
     12 #include "SampleCode.h"
     13 #include "SkDumpCanvas.h"
     14 #include "SkView.h"
     15 #include "SkCanvas.h"
     16 #include "SkGradientShader.h"
     17 #include "SkGraphics.h"
     18 #include "SkOSFile.h"
     19 #include "SkPath.h"
     20 #include "SkPicture.h"
     21 #include "SkRandom.h"
     22 #include "SkRegion.h"
     23 #include "SkShader.h"
     24 #include "SkUtils.h"
     25 #include "SkColorPriv.h"
     26 #include "SkColorFilter.h"
     27 #include "SkTime.h"
     28 #include "SkTypeface.h"
     29 #include "SkPdfRenderer.h"
     30 
     31 class PdfFileViewer : public SampleView {
     32 private:
     33     SkString    fFilename;
     34     SkPicture*  fPicture;  // TODO(edisonn): multiple pages, one page / picture, make it an array
     35 
     36     static SkPicture* LoadPdf(const char path[]) {
     37         std::unique_ptr<SkPdfRenderer> renderer(SkPdfRenderer::CreateFromFile(path));
     38         if (nullptr == renderer.get()) {
     39             return nullptr;
     40         }
     41 
     42         SkPicture* pic = new SkPicture;
     43         SkCanvas* canvas = pic->beginRecording((int) renderer->MediaBox(0).width(),
     44                                                (int) renderer->MediaBox(0).height());
     45         renderer->renderPage(0, canvas, renderer->MediaBox(0));
     46         pic->endRecording();
     47         return pic;
     48     }
     49 
     50 public:
     51     PdfFileViewer(const char name[] = nullptr) : fFilename(name) {
     52         fPicture = nullptr;
     53     }
     54 
     55     virtual ~PdfFileViewer() {
     56         SkSafeUnref(fPicture);
     57     }
     58 
     59 protected:
     60     // overrides from SkEventSink
     61     virtual bool onQuery(SkEvent* evt) {
     62         if (SampleCode::TitleQ(*evt)) {
     63             SkString name("P:");
     64             const char* basename = strrchr(fFilename.c_str(), SkPATH_SEPARATOR);
     65             name.append(basename ? basename+1: fFilename.c_str());
     66             SampleCode::TitleR(evt, name.c_str());
     67             return true;
     68         }
     69         return this->INHERITED::onQuery(evt);
     70     }
     71 
     72     virtual bool onEvent(const SkEvent& evt) {
     73         // TODO(edisonn): add here event handlers to disable clipping, or to show helpful info
     74         // like pdf object from click, ...
     75         // TODO(edisonn): first, next, prev, last page navigation + slideshow
     76         return this->INHERITED::onEvent(evt);
     77     }
     78 
     79     virtual void onDrawContent(SkCanvas* canvas) {
     80         if (!fPicture) {
     81             fPicture = LoadPdf(fFilename.c_str());
     82         }
     83         if (fPicture) {
     84             canvas->drawPicture(*fPicture);
     85         }
     86     }
     87 
     88 private:
     89     typedef SampleView INHERITED;
     90 };
     91 
     92 SampleView* CreateSamplePdfFileViewer(const char filename[]);
     93 SampleView* CreateSamplePdfFileViewer(const char filename[]) {
     94     return new PdfFileViewer(filename);
     95 }
     96 
     97 //////////////////////////////////////////////////////////////////////////////
     98 
     99 #if 0
    100 static SkView* MyFactory() { return new PdfFileViewer; }
    101 static SkViewRegister reg(MyFactory);
    102 #endif
    103 
    104 #endif  // SAMPLE_PDF_FILE_VIEWER
    105