cpdf_rendercontext.h

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// Copyright 2016 The PDFium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
 
// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
#ifndef CORE_FPDFAPI_RENDER_CPDF_RENDERCONTEXT_H_
#define CORE_FPDFAPI_RENDER_CPDF_RENDERCONTEXT_H_
 
#include <vector>
 
#include "core/fxcrt/fx_coordinates.h"
#include "core/fxcrt/retain_ptr.h"
#include "core/fxcrt/unowned_ptr.h"
 
class CFX_DIBitmap;
class CFX_Matrix;
class CFX_RenderDevice;
class CPDF_Dictionary;
class CPDF_Document;
class CPDF_PageImageCache;
class CPDF_PageObject;
class CPDF_PageObjectHolder;
class CPDF_RenderOptions;
 
class CPDF_RenderContext {
 public:
  class Layer {
   public:
    Layer(CPDF_PageObjectHolder* pHolder, const CFX_Matrix& matrix);
    Layer(const Layer& that);
    ~Layer();
 
    CPDF_PageObjectHolder* GetObjectHolder() { return m_pObjectHolder; }
    const CFX_Matrix& GetMatrix() const { return m_Matrix; }
 
   private:
    UnownedPtr<CPDF_PageObjectHolder> const m_pObjectHolder;
    const CFX_Matrix m_Matrix;
  };
 
  CPDF_RenderContext(CPDF_Document* pDoc,
                     RetainPtr<CPDF_Dictionary> pPageResources,
                     CPDF_PageImageCache* pPageCache);
  ~CPDF_RenderContext();
 
  void AppendLayer(CPDF_PageObjectHolder* pObjectHolder,
                   const CFX_Matrix& mtObject2Device);
 
  void Render(CFX_RenderDevice* pDevice,
              const CPDF_PageObject* pStopObj,
              const CPDF_RenderOptions* pOptions,
              const CFX_Matrix* pLastMatrix);
 
  void GetBackgroundToDevice(CFX_RenderDevice* device,
                             const CPDF_PageObject* object,
                             const CPDF_RenderOptions* options,
                             const CFX_Matrix& matrix);
  void GetBackgroundToBitmap(RetainPtr<CFX_DIBitmap> bitmap,
                             const CPDF_PageObject* object,
                             const CFX_Matrix& matrix);
 
  size_t CountLayers() const { return m_Layers.size(); }
  Layer* GetLayer(uint32_t index) { return &m_Layers[index]; }
 
  CPDF_Document* GetDocument() const { return m_pDocument; }
  const CPDF_Dictionary* GetPageResources() const {
    return m_pPageResources.Get();
  }
  RetainPtr<CPDF_Dictionary> GetMutablePageResources() {
    return m_pPageResources;
  }
  CPDF_PageImageCache* GetPageCache() const { return m_pPageCache; }
 
 private:
  UnownedPtr<CPDF_Document> const m_pDocument;
  RetainPtr<CPDF_Dictionary> const m_pPageResources;
  UnownedPtr<CPDF_PageImageCache> const m_pPageCache;
  std::vector<Layer> m_Layers;
};
 
#endif  // CORE_FPDFAPI_RENDER_CPDF_RENDERCONTEXT_H_