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      1 // Copyright 2016 PDFium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
      6 
      7 #ifndef CORE_FPDFAPI_RENDER_CPDF_PROGRESSIVERENDERER_H_
      8 #define CORE_FPDFAPI_RENDER_CPDF_PROGRESSIVERENDERER_H_
      9 
     10 #include <memory>
     11 
     12 #include "core/fpdfapi/page/cpdf_pageobjectlist.h"
     13 #include "core/fpdfapi/render/cpdf_rendercontext.h"
     14 #include "core/fxcrt/fx_coordinates.h"
     15 #include "core/fxcrt/fx_system.h"
     16 
     17 class CPDF_RenderOptions;
     18 class CPDF_RenderStatus;
     19 class CFX_RenderDevice;
     20 class IFX_Pause;
     21 
     22 class CPDF_ProgressiveRenderer {
     23  public:
     24   // Must match FDF_RENDER_* definitions in public/fpdf_progressive.h, but
     25   // cannot #include that header. fpdfsdk/fpdf_progressive.cpp has
     26   // static_asserts to make sure the two sets of values match.
     27   enum Status {
     28     Ready,          // FPDF_RENDER_READER
     29     ToBeContinued,  // FPDF_RENDER_TOBECOUNTINUED
     30     Done,           // FPDF_RENDER_DONE
     31     Failed          // FPDF_RENDER_FAILED
     32   };
     33 
     34   static int ToFPDFStatus(Status status) { return static_cast<int>(status); }
     35 
     36   CPDF_ProgressiveRenderer(CPDF_RenderContext* pContext,
     37                            CFX_RenderDevice* pDevice,
     38                            const CPDF_RenderOptions* pOptions);
     39   ~CPDF_ProgressiveRenderer();
     40 
     41   Status GetStatus() const { return m_Status; }
     42   void Start(IFX_Pause* pPause);
     43   void Continue(IFX_Pause* pPause);
     44 
     45  private:
     46   // Maximum page objects to render before checking for pause.
     47   static const int kStepLimit = 100;
     48 
     49   Status m_Status;
     50   CPDF_RenderContext* const m_pContext;
     51   CFX_RenderDevice* const m_pDevice;
     52   const CPDF_RenderOptions* const m_pOptions;
     53   std::unique_ptr<CPDF_RenderStatus> m_pRenderStatus;
     54   CFX_FloatRect m_ClipRect;
     55   uint32_t m_LayerIndex;
     56   CPDF_RenderContext::Layer* m_pCurrentLayer;
     57   CPDF_PageObjectList::iterator m_LastObjectRendered;
     58 };
     59 
     60 #endif  // CORE_FPDFAPI_RENDER_CPDF_PROGRESSIVERENDERER_H_
     61