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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 #ifdef SAMPLE_PDF_FILE_VIEWER
      9 
     10 #include "SampleCode.h"
     11 #include "SkDumpCanvas.h"
     12 #include "SkView.h"
     13 #include "SkCanvas.h"
     14 #include "SkGradientShader.h"
     15 #include "SkGraphics.h"
     16 #include "SkImageDecoder.h"
     17 #include "SkOSFile.h"
     18 #include "SkPath.h"
     19 #include "SkPicture.h"
     20 #include "SkRandom.h"
     21 #include "SkRegion.h"
     22 #include "SkShader.h"
     23 #include "SkUtils.h"
     24 #include "SkColorPriv.h"
     25 #include "SkColorFilter.h"
     26 #include "SkTime.h"
     27 #include "SkTypeface.h"
     28 #include "SkXfermode.h"
     29 
     30 #include "SkPdfRenderer.h"
     31 
     32 class PdfFileViewer : public SampleView {
     33 private:
     34     SkString    fFilename;
     35     SkPicture*  fPicture;  // TODO(edisonn): multiple pages, one page / picture, make it an array
     36 
     37     static SkPicture* LoadPdf(const char path[]) {
     38         SkAutoTDelete<SkPdfRenderer> renderer(SkPdfRenderer::CreateFromFile(path));
     39         if (NULL == renderer.get()) {
     40             return NULL;
     41         }
     42 
     43         SkPicture* pic = SkNEW(SkPicture);
     44         SkCanvas* canvas = pic->beginRecording((int) renderer->MediaBox(0).width(),
     45                                                (int) renderer->MediaBox(0).height());
     46         renderer->renderPage(0, canvas, renderer->MediaBox(0));
     47         pic->endRecording();
     48         return pic;
     49     }
     50 
     51 public:
     52     PdfFileViewer(const char name[] = NULL) : fFilename(name) {
     53         fPicture = NULL;
     54     }
     55 
     56     virtual ~PdfFileViewer() {
     57         SkSafeUnref(fPicture);
     58     }
     59 
     60 protected:
     61     // overrides from SkEventSink
     62     virtual bool onQuery(SkEvent* evt) {
     63         if (SampleCode::TitleQ(*evt)) {
     64             SkString name("P:");
     65             const char* basename = strrchr(fFilename.c_str(), SkPATH_SEPARATOR);
     66             name.append(basename ? basename+1: fFilename.c_str());
     67             SampleCode::TitleR(evt, name.c_str());
     68             return true;
     69         }
     70         return this->INHERITED::onQuery(evt);
     71     }
     72 
     73     virtual bool onEvent(const SkEvent& evt) {
     74         // TODO(edisonn): add here event handlers to disable clipping, or to show helpful info
     75         // like pdf object from click, ...
     76         // TODO(edisonn): first, next, prev, last page navigation + slideshow
     77         return this->INHERITED::onEvent(evt);
     78     }
     79 
     80     virtual void onDrawContent(SkCanvas* canvas) {
     81         if (!fPicture) {
     82             fPicture = LoadPdf(fFilename.c_str());
     83         }
     84         if (fPicture) {
     85             canvas->drawPicture(*fPicture);
     86         }
     87     }
     88 
     89 private:
     90     typedef SampleView INHERITED;
     91 };
     92 
     93 SampleView* CreateSamplePdfFileViewer(const char filename[]);
     94 SampleView* CreateSamplePdfFileViewer(const char filename[]) {
     95     return new PdfFileViewer(filename);
     96 }
     97 
     98 //////////////////////////////////////////////////////////////////////////////
     99 
    100 #if 0
    101 static SkView* MyFactory() { return new PdfFileViewer; }
    102 static SkViewRegister reg(MyFactory);
    103 #endif
    104 
    105 #endif  // SAMPLE_PDF_FILE_VIEWER
    106