cpdf_imagerenderer.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_IMAGERENDERER_H_
#define CORE_FPDFAPI_RENDER_CPDF_IMAGERENDERER_H_
 
#include <memory>
#include <optional>
 
#include "build/build_config.h"
#include "core/fxcrt/fx_coordinates.h"
#include "core/fxcrt/retain_ptr.h"
#include "core/fxcrt/unowned_ptr.h"
#include "core/fxge/dib/fx_dib.h"
 
class CFX_AggImageRenderer;
class CFX_DIBBase;
class CFX_DIBitmap;
class CFX_DefaultRenderDevice;
class CPDF_ImageLoader;
class CPDF_ImageObject;
class CPDF_Pattern;
class CPDF_RenderOptions;
class CPDF_RenderStatus;
class PauseIndicatorIface;
 
#if BUILDFLAG(IS_WIN)
class CFX_ImageTransformer;
#endif
 
class CPDF_ImageRenderer {
 public:
  explicit CPDF_ImageRenderer(CPDF_RenderStatus* pStatus);
  ~CPDF_ImageRenderer();
 
  bool Start(CPDF_ImageObject* pImageObject,
             const CFX_Matrix& mtObj2Device,
             bool bStdCS);
 
  bool Start(RetainPtr<CFX_DIBBase> pDIBBase,
             FX_ARGB bitmap_argb,
             const CFX_Matrix& mtImage2Device,
             const FXDIB_ResampleOptions& options,
             bool bStdCS);
 
  bool Continue(PauseIndicatorIface* pPause);
  bool GetResult() const { return m_Result; }
 
 private:
  enum class Mode {
    kNone = 0,
    kDefault,
    kBlend,  // AGG-specific
#if BUILDFLAG(IS_WIN)
    kTransform,
#endif
  };
 
  bool StartBitmapAlpha();
  bool StartDIBBase();
  bool StartRenderDIBBase();
  bool StartLoadDIBBase();
  bool ContinueDefault(PauseIndicatorIface* pPause);
  bool ContinueBlend(PauseIndicatorIface* pPause);
  bool DrawMaskedImage();
  bool DrawPatternImage();
#if BUILDFLAG(IS_WIN)
  bool StartDIBBaseFallback();
  bool ContinueTransform(PauseIndicatorIface* pPause);
  bool IsPrinting() const;
  void HandleFilters();
#endif
  FX_RECT GetDrawRect() const;
  CFX_Matrix GetDrawMatrix(const FX_RECT& rect) const;
  // Returns the mask, or nullptr if the mask could not be created.
  RetainPtr<const CFX_DIBitmap> CalculateDrawImage(
      CFX_DefaultRenderDevice& bitmap_device,
      RetainPtr<CFX_DIBBase> pDIBBase,
      const CFX_Matrix& mtNewMatrix,
      const FX_RECT& rect) const;
  const CPDF_RenderOptions& GetRenderOptions() const;
  std::optional<FX_RECT> GetUnitRect() const;
  bool GetDimensionsFromUnitRect(const FX_RECT& rect,
                                 int* left,
                                 int* top,
                                 int* width,
                                 int* height) const;
 
  UnownedPtr<CPDF_RenderStatus> const m_pRenderStatus;
  UnownedPtr<CPDF_ImageObject> m_pImageObject;
  RetainPtr<CPDF_Pattern> m_pPattern;
  RetainPtr<CFX_DIBBase> m_pDIBBase;
  CFX_Matrix m_mtObj2Device;
  CFX_Matrix m_ImageMatrix;
  std::unique_ptr<CPDF_ImageLoader> const m_pLoader;
#if BUILDFLAG(IS_WIN)
  std::unique_ptr<CFX_ImageTransformer> m_pTransformer;
#endif
  std::unique_ptr<CFX_AggImageRenderer> m_DeviceHandle;
  Mode m_Mode = Mode::kNone;
  float m_Alpha = 0.0f;
  BlendMode m_BlendType = BlendMode::kNormal;
  FX_ARGB m_FillArgb = 0;
  FXDIB_ResampleOptions m_ResampleOptions;
  bool m_bPatternColor = false;
  bool m_bStdCS = false;
  bool m_Result = true;
};
 
#endif  // CORE_FPDFAPI_RENDER_CPDF_IMAGERENDERER_H_