qt5/src/ArthurOutputDev.h

//========================================================================
//
// ArthurOutputDev.h
//
// Copyright 2003 Glyph & Cog, LLC
//
//========================================================================

//========================================================================
//
// Modified under the Poppler project - http://poppler.freedesktop.org
//
// All changes made under the Poppler project to this file are licensed
// under GPL version 2 or later
//
// Copyright (C) 2005 Brad Hards <bradh@frogmouth.net>
// Copyright (C) 2005, 2018, 2019 Albert Astals Cid <aacid@kde.org>
// Copyright (C) 2009, 2011 Carlos Garcia Campos <carlosgc@gnome.org>
// Copyright (C) 2010 Pino Toscano <pino@kde.org>
// Copyright (C) 2011 Andreas Hartmetz <ahartmetz@gmail.com>
// Copyright (C) 2013 Thomas Freitag <Thomas.Freitag@alfa.de>
// Copyright (C) 2013 Mihai Niculescu <q.quark@gmail.com>
// Copyright (C) 2017, 2018 Oliver Sander <oliver.sander@tu-dresden.de>
//
// To see a description of the changes please see the Changelog file that
// came with your tarball or type make ChangeLog if you are building from git
//
//========================================================================

#ifndef ARTHUROUTPUTDEV_H
#define ARTHUROUTPUTDEV_H

#include <memory>
#include <map>
#include <stack>

#include "OutputDev.h"
#include "GfxState.h"

#include <ft2build.h>
#include FT_FREETYPE_H

#include <QtGui/QPainter>

class GfxState;
class PDFDoc;

class QRawFont;

class ArthurType3Font;

//------------------------------------------------------------------------
// ArthurOutputDev - Qt 5 QPainter renderer
//------------------------------------------------------------------------

class ArthurOutputDev: public OutputDev {
public:
  /**
   * Describes how fonts are distorted (aka hinted) to fit the pixel grid.
   * More hinting means sharper edges and less adherence to the true letter shapes.
   */
  enum FontHinting {
    NoHinting = 0, ///< Font shapes are left unchanged
    SlightHinting, ///< Font shapes are distorted vertically only
    FullHinting ///< Font shapes are distorted horizontally and vertically
  };

  // Constructor.
  ArthurOutputDev(QPainter *painter );

  // Destructor.
  ~ArthurOutputDev();

  void setFontHinting(FontHinting hinting) { m_fontHinting = hinting; }

  //----- get info about output device

  // Does this device use upside-down coordinates?
  // (Upside-down means (0,0) is the top left corner of the page.)
  bool upsideDown() override { return true; }

  // Does this device use drawChar() or drawString()?
  bool useDrawChar() override { return true; }

  // Does this device implement shaded fills (aka gradients) natively?
  // If this returns false, these shaded fills
  // will be reduced to a series of other drawing operations.
  // type==2 is 'axial shading'
  bool useShadedFills(int type) override { return type == 2; }

  // Does this device use beginType3Char/endType3Char?  Otherwise,
  // text in Type 3 fonts will be drawn with drawChar/drawString.
  bool interpretType3Chars() override { return false; }

  //----- initialization and control

  // Set Current Transformation Matrix to a fixed matrix given in ctm[0],...,ctm[5]
  void setDefaultCTM(const double *ctm) override;

  // Start a page.
  void startPage(int pageNum, GfxState *state, XRef *xref) override;

  // End a page.
  void endPage() override;

  //----- save/restore graphics state
  void saveState(GfxState *state) override;
  void restoreState(GfxState *state) override;

  //----- update graphics state
  void updateAll(GfxState *state) override;
  void updateCTM(GfxState *state, double m11, double m12,
		 double m21, double m22, double m31, double m32) override;
  void updateLineDash(GfxState *state) override;
  void updateFlatness(GfxState *state) override;
  void updateLineJoin(GfxState *state) override;
  void updateLineCap(GfxState *state) override;
  void updateMiterLimit(GfxState *state) override;
  void updateLineWidth(GfxState *state) override;
  void updateFillColor(GfxState *state) override;
  void updateStrokeColor(GfxState *state) override;
  void updateBlendMode(GfxState *state) override;
  void updateFillOpacity(GfxState *state) override;
  void updateStrokeOpacity(GfxState *state) override;

  //----- update text state
  void updateFont(GfxState *state) override;

  //----- path painting
  void stroke(GfxState *state) override;
  void fill(GfxState *state) override;
  void eoFill(GfxState *state) override;
  bool axialShadedFill(GfxState * state, GfxAxialShading *shading, double tMin, double tMax) override;

  //----- path clipping
  void clip(GfxState *state) override;
  void eoClip(GfxState *state) override;

  //----- text drawing
  //   virtual void drawString(GfxState *state, GooString *s);
  void drawChar(GfxState *state, double x, double y,
		double dx, double dy,
		double originX, double originY,
		CharCode code, int nBytes, const Unicode *u, int uLen) override;
  void endTextObject(GfxState *state) override;

  //----- image drawing
  void drawImageMask(GfxState *state, Object *ref, Stream *str,
		     int width, int height, bool invert,
		     bool interpolate, bool inlineImg) override;
  void drawImage(GfxState *state, Object *ref, Stream *str,
		 int width, int height, GfxImageColorMap *colorMap,
		 bool interpolate, const int *maskColors, bool inlineImg) override;

  void drawSoftMaskedImage(GfxState *state, Object *ref, Stream *str,
                           int width, int height,
                           GfxImageColorMap *colorMap,
                           bool interpolate,
                           Stream *maskStr,
                           int maskWidth, int maskHeight,
                           GfxImageColorMap *maskColorMap,
                           bool maskInterpolate) override;

  //----- Type 3 font operators
  void type3D0(GfxState *state, double wx, double wy) override;
  void type3D1(GfxState *state, double wx, double wy,
	       double llx, double lly, double urx, double ury) override;

  //----- transparency groups and soft masks
  virtual void beginTransparencyGroup(GfxState *state, const double *bbox,
                                      GfxColorSpace *blendingColorSpace,
                                      bool isolated, bool knockout,
                                      bool forSoftMask) override;
  virtual void endTransparencyGroup(GfxState *state) override;
  virtual void paintTransparencyGroup(GfxState *state, const double *bbox) override;

  //----- special access

  // Called to indicate that a new PDF document has been loaded.
  void startDoc(PDFDoc* doc);

  bool isReverseVideo() { return false; }
  
private:

  // The stack of QPainters is used to implement transparency groups.  When such a group
  // is opened, annew Painter that paints onto a QPicture is pushed onto the stack.
  // It is popped again when the transparency group ends.
  std::stack<QPainter*> m_painter;

  // This is the corresponding stack of QPicture objects
  std::stack<QPicture*> m_qpictures;

  // endTransparencyGroup removes a QPicture from the stack, but stores
  // it here for later use in paintTransparencyGroup.
  QPicture* m_lastTransparencyGroupPicture;

  FontHinting m_fontHinting;

  QPen m_currentPen;
  // The various stacks are used to implement the 'saveState' and 'restoreState' methods
  std::stack<QPen> m_currentPenStack;

  QBrush m_currentBrush;
  std::stack<QBrush> m_currentBrushStack;

  bool m_needFontUpdate;		// set when the font needs to be updated
  PDFDoc* m_doc;
  XRef *xref;			// xref table for current document

  // The current font in use
  QRawFont* m_rawFont;
  std::stack<QRawFont*> m_rawFontStack;

  ArthurType3Font* m_currentType3Font;
  std::stack<ArthurType3Font*> m_type3FontStack;

  // Cache all fonts by their Ref and font size
  using ArthurFontID = std::pair<Ref,double>;
  std::map<ArthurFontID,std::unique_ptr<QRawFont> > m_rawFontCache;
  std::map<ArthurFontID,std::unique_ptr<ArthurType3Font> > m_type3FontCache;
  std::map<Ref,const int*> m_codeToGIDCache;

  // The table that maps character codes to glyph indexes
  const int* m_codeToGID;
  std::stack<const int*> m_codeToGIDStack;

  FT_Library m_ftLibrary;
  // as of FT 2.1.8, CID fonts are indexed by CID instead of GID
  bool m_useCIDs;
};

#endif