path: root/poppler/OutputDev.h

//========================================================================
//
// OutputDev.h
//
// Copyright 1996-2003 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 Jonathan Blandford <jrb@redhat.com>
// Copyright (C) 2006 Thorkild Stray <thorkild@ifi.uio.no>
// Copyright (C) 2007 Jeff Muizelaar <jeff@infidigm.net>
// Copyright (C) 2007, 2011, 2017 Adrian Johnson <ajohnson@redneon.com>
// Copyright (C) 2009-2013, 2015 Thomas Freitag <Thomas.Freitag@alfa.de>
// Copyright (C) 2009, 2011 Carlos Garcia Campos <carlosgc@gnome.org>
// Copyright (C) 2009, 2012, 2013, 2018, 2019 Albert Astals Cid <aacid@kde.org>
// Copyright (C) 2010 Christian Feuersänger <cfeuersaenger@googlemail.com>
// Copyright (C) 2012 Fabio D'Urso <fabiodurso@hotmail.it>
// Copyright (C) 2012 William Bader <williambader@hotmail.com>
// Copyright (C) 2017, 2018 Oliver Sander <oliver.sander@tu-dresden.de>
// Copyright (C) 2018 Klarälvdalens Datakonsult AB, a KDAB Group company, <info@kdab.com>. Work sponsored by the LiMux project of the city of Munich
// Copyright (C) 2018 Adam Reichold <adam.reichold@t-online.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 OUTPUTDEV_H
#define OUTPUTDEV_H

#include "poppler-config.h"
#include "CharTypes.h"
#include "Object.h"
#include "PopplerCache.h"
#include "ProfileData.h"
#include <memory>
#include <unordered_map>
#include <string>

class Annot;
class Dict;
class GooString;
class GfxState;
class Gfx;
struct GfxColor;
class GfxColorSpace;
#ifdef USE_CMS
class GfxICCBasedColorSpace;
#endif
class GfxImageColorMap;
class GfxFunctionShading;
class GfxAxialShading;
class GfxGouraudTriangleShading;
class GfxPatchMeshShading;
class GfxRadialShading;
class GfxGouraudTriangleShading;
class GfxPatchMeshShading;
class Stream;
class Links;
class AnnotLink;
class Catalog;
class Page;
class Function;

//------------------------------------------------------------------------
// OutputDev
//------------------------------------------------------------------------

class OutputDev {
public:

  // Constructor.
  OutputDev();

  // Destructor.
  virtual ~OutputDev();

  //----- 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.)
  virtual bool upsideDown() = 0;

  // Does this device use drawChar() or drawString()?
  virtual bool useDrawChar() = 0;

  // Does this device use tilingPatternFill()?  If this returns false,
  // tiling pattern fills will be reduced to a series of other drawing
  // operations.
  virtual bool useTilingPatternFill() { return false; }

  // Does this device support specific shading types?
  // see gouraudTriangleShadedFill() and patchMeshShadedFill()
  virtual bool useShadedFills(int type) { return false; }

  // Does this device use FillColorStop()?
  virtual bool useFillColorStop() { return false; }

  // Does this device use drawForm()?  If this returns false,
  // form-type XObjects will be interpreted (i.e., unrolled).
  virtual bool useDrawForm() { return false; }

  // Does this device use beginType3Char/endType3Char?  Otherwise,
  // text in Type 3 fonts will be drawn with drawChar/drawString.
  virtual bool interpretType3Chars() = 0;

  // Does this device need non-text content?
  virtual bool needNonText() { return true; }

  // Does this device require incCharCount to be called for text on
  // non-shown layers?
  virtual bool needCharCount() { return false; }
  
  // Does this device need to clip pages to the crop box even when the
  // box is the crop box?
  virtual bool needClipToCropBox() { return false; }

  //----- initialization and control

  // Set default transform matrix.
  virtual void setDefaultCTM(const double *ctm);

  // Check to see if a page slice should be displayed.  If this
  // returns false, the page display is aborted.  Typically, an
  // OutputDev will use some alternate means to display the page
  // before returning false.
  virtual bool checkPageSlice(Page *page, double hDPI, double vDPI,
			       int rotate, bool useMediaBox, bool crop,
			       int sliceX, int sliceY, int sliceW, int sliceH,
			       bool printing,
			       bool (* abortCheckCbk)(void *data) = nullptr,
			       void * abortCheckCbkData = nullptr,
			       bool (*annotDisplayDecideCbk)(Annot *annot, void *user_data) = nullptr,
			       void *annotDisplayDecideCbkData = nullptr)
    { return true; }

  // Start a page.
  virtual void startPage(int pageNum, GfxState *state, XRef *xref) {}

  // End a page.
  virtual void endPage() {}

  // Dump page contents to display.
  virtual void dump() {}

  //----- coordinate conversion

  // Convert between device and user coordinates.
  virtual void cvtDevToUser(double dx, double dy, double *ux, double *uy);
  virtual void cvtUserToDev(double ux, double uy, int *dx, int *dy);

  const double *getDefCTM() const { return defCTM; }
  const double *getDefICTM() const { return defICTM; }

  //----- save/restore graphics state
  virtual void saveState(GfxState * /*state*/) {}
  virtual void restoreState(GfxState * /*state*/) {}

  //----- update graphics state
  virtual void updateAll(GfxState *state);

  // Update the Current Transformation Matrix (CTM), i.e., the new matrix
  // given in m11, ..., m32 is combined with the current value of the CTM.
  // At the same time, when this method is called, state->getCTM() already
  // contains the correct new CTM, so one may as well replace the
  // CTM of the renderer with that.
  virtual void updateCTM(GfxState * /*state*/, double /*m11*/, double /*m12*/,
			 double /*m21*/, double /*m22*/, double /*m31*/, double /*m32*/) {}
  virtual void updateLineDash(GfxState * /*state*/) {}
  virtual void updateFlatness(GfxState * /*state*/) {}
  virtual void updateLineJoin(GfxState * /*state*/) {}
  virtual void updateLineCap(GfxState * /*state*/) {}
  virtual void updateMiterLimit(GfxState * /*state*/) {}
  virtual void updateLineWidth(GfxState * /*state*/) {}
  virtual void updateStrokeAdjust(GfxState * /*state*/) {}
  virtual void updateAlphaIsShape(GfxState * /*state*/) {}
  virtual void updateTextKnockout(GfxState * /*state*/) {}
  virtual void updateFillColorSpace(GfxState * /*state*/) {}
  virtual void updateStrokeColorSpace(GfxState * /*state*/) {}
  virtual void updateFillColor(GfxState * /*state*/) {}
  virtual void updateStrokeColor(GfxState * /*state*/) {}
  virtual void updateBlendMode(GfxState * /*state*/) {}
  virtual void updateFillOpacity(GfxState * /*state*/) {}
  virtual void updateStrokeOpacity(GfxState * /*state*/) {}
  virtual void updatePatternOpacity(GfxState * /*state*/) {}
  virtual void clearPatternOpacity(GfxState * /*state*/) {}
  virtual void updateFillOverprint(GfxState * /*state*/) {}
  virtual void updateStrokeOverprint(GfxState * /*state*/) {}
  virtual void updateOverprintMode(GfxState * /*state*/) {}
  virtual void updateTransfer(GfxState * /*state*/) {}
  virtual void updateFillColorStop(GfxState * /*state*/, double /*offset*/) {}

  //----- update text state
  virtual void updateFont(GfxState * /*state*/) {}
  virtual void updateTextMat(GfxState * /*state*/) {}
  virtual void updateCharSpace(GfxState * /*state*/) {}
  virtual void updateRender(GfxState * /*state*/) {}
  virtual void updateRise(GfxState * /*state*/) {}
  virtual void updateWordSpace(GfxState * /*state*/) {}
  virtual void updateHorizScaling(GfxState * /*state*/) {}
  virtual void updateTextPos(GfxState * /*state*/) {}
  virtual void updateTextShift(GfxState * /*state*/, double /*shift*/) {}
  virtual void saveTextPos(GfxState * /*state*/) {}
  virtual void restoreTextPos(GfxState * /*state*/) {}

  //----- path painting
  virtual void stroke(GfxState * /*state*/) {}
  virtual void fill(GfxState * /*state*/) {}
  virtual void eoFill(GfxState * /*state*/) {}
  virtual bool tilingPatternFill(GfxState * /*state*/, Gfx * /*gfx*/, Catalog * /*cat*/, Object * /*str*/,
				  const double * /*pmat*/, int /*paintType*/, int /*tilingType*/, Dict * /*resDict*/,
				  const double * /*mat*/, const double * /*bbox*/,
				  int /*x0*/, int /*y0*/, int /*x1*/, int /*y1*/,
				  double /*xStep*/, double /*yStep*/)
    { return false; }
  virtual bool functionShadedFill(GfxState * /*state*/,
				   GfxFunctionShading * /*shading*/)
    { return false; }
  virtual bool axialShadedFill(GfxState * /*state*/, GfxAxialShading * /*shading*/, double /*tMin*/, double /*tMax*/)
    { return false; }
  virtual bool axialShadedSupportExtend(GfxState * /*state*/, GfxAxialShading * /*shading*/)
    { return false; }
  virtual bool radialShadedFill(GfxState * /*state*/, GfxRadialShading * /*shading*/, double /*sMin*/, double /*sMax*/)
    { return false; }
  virtual bool radialShadedSupportExtend(GfxState * /*state*/, GfxRadialShading * /*shading*/)
    { return false; }
  virtual bool gouraudTriangleShadedFill(GfxState *state, GfxGouraudTriangleShading *shading)
    { return false; }
  virtual bool patchMeshShadedFill(GfxState *state, GfxPatchMeshShading *shading)
    { return false; }

  //----- path clipping

  // Update the clipping path.  The new path is the intersection of the old path
  // with the path given in 'state'.
  // Additionally, set the clipping mode to the 'nonzero winding number rule'.
  // That is, a point is inside the clipping region if its winding number
  // with respect to the clipping path is nonzero.
  virtual void clip(GfxState * /*state*/) {}

  // Update the clipping path.  The new path is the intersection of the old path
  // with the path given in 'state'.
  // Additionally, set the clipping mode to the 'even-odd rule'.  That is, a point is
  // inside the clipping region if a ray from it to infinity will cross the clipping
  // path an odd number of times (disregarding the path orientation).
  virtual void eoClip(GfxState * /*state*/) {}
  virtual void clipToStrokePath(GfxState * /*state*/) {}

  //----- text drawing
  virtual void beginStringOp(GfxState * /*state*/) {}
  virtual void endStringOp(GfxState * /*state*/) {}
  virtual void beginString(GfxState * /*state*/, const GooString * /*s*/) {}
  virtual void endString(GfxState * /*state*/) {}

  // Draw one glyph at a specified position
  //
  // Arguments are:
  // CharCode code: This is the character code in the content stream. It needs to be mapped back to a glyph index.
  // int nBytes: The text strings in the content stream can consists of either 8-bit or 16-bit
  //             character codes depending on the font. nBytes is the number of bytes in the character code.
  // Unicode *u: The UCS-4 mapping used for text extraction (TextOutputDev).
  // int uLen: The number of unicode entries in u.  Usually '1', for a single character,
  //           but it may also have larger values, for example for ligatures.
  virtual void drawChar(GfxState * /*state*/, double /*x*/, double /*y*/,
			double /*dx*/, double /*dy*/,
			double /*originX*/, double /*originY*/,
			CharCode /*code*/, int /*nBytes*/, Unicode * /*u*/, int /*uLen*/) {}
  virtual void drawString(GfxState * /*state*/, const GooString * /*s*/) {}
  virtual bool beginType3Char(GfxState * /*state*/, double /*x*/, double /*y*/,
			       double /*dx*/, double /*dy*/,
			       CharCode /*code*/, Unicode * /*u*/, int /*uLen*/);
  virtual void endType3Char(GfxState * /*state*/) {}
  virtual void beginTextObject(GfxState * /*state*/) {}
  virtual void endTextObject(GfxState * /*state*/) {}
  virtual void incCharCount(int /*nChars*/) {}
  virtual void beginActualText(GfxState * /*state*/, const GooString * /*text*/ ) {}
  virtual void endActualText(GfxState * /*state*/) {}

  //----- image drawing
  // Draw an image mask.  An image mask is a one-bit-per-pixel image, where each pixel
  // can only be 'fill color' or 'transparent'.
  //
  // If 'invert' is false, a sample value of 0 marks the page with the current color,
  // and a 1 leaves the previous contents unchanged. If 'invert' is true, these meanings are reversed.
  virtual void drawImageMask(GfxState *state, Object *ref, Stream *str,
			     int width, int height, bool invert, bool interpolate,
			     bool inlineImg);
  virtual void setSoftMaskFromImageMask(GfxState *state,
					Object *ref, Stream *str,
					int width, int height, bool invert,
					bool inlineImg, double *baseMatrix);
  virtual void unsetSoftMaskFromImageMask(GfxState *state, double *baseMatrix);
  virtual void drawImage(GfxState *state, Object *ref, Stream *str,
			 int width, int height, GfxImageColorMap *colorMap,
			 bool interpolate, const int *maskColors, bool inlineImg);
  virtual void drawMaskedImage(GfxState *state, Object *ref, Stream *str,
			       int width, int height,
			       GfxImageColorMap *colorMap, bool interpolate,
			       Stream *maskStr, int maskWidth, int maskHeight,
			       bool maskInvert, bool maskInterpolate);
  virtual 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);

  //----- grouping operators

  virtual void endMarkedContent(GfxState *state);
  virtual void beginMarkedContent(const char *name, Dict *properties);
  virtual void markPoint(const char *name);
  virtual void markPoint(const char *name, Dict *properties);



#ifdef OPI_SUPPORT
  //----- OPI functions
  virtual void opiBegin(GfxState *state, Dict *opiDict);
  virtual void opiEnd(GfxState *state, Dict *opiDict);
#endif

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

  //----- form XObjects
  virtual void drawForm(Ref /*id*/) {}

  //----- PostScript XObjects
  virtual void psXObject(Stream * /*psStream*/, Stream * /*level1Stream*/) {}

  //----- Profiling
  void startProfile();
  std::unordered_map<std::string, ProfileData>* getProfileHash() const { return profileHash.get(); }
  std::unique_ptr<std::unordered_map<std::string, ProfileData>> endProfile();

  //----- transparency groups and soft masks
  virtual bool checkTransparencyGroup(GfxState * /*state*/, bool /*knockout*/) { return true; }
  virtual void beginTransparencyGroup(GfxState * /*state*/, const double * /*bbox*/,
				      GfxColorSpace * /*blendingColorSpace*/,
				      bool /*isolated*/, bool /*knockout*/,
				      bool /*forSoftMask*/) {}
  virtual void endTransparencyGroup(GfxState * /*state*/) {}
  virtual void paintTransparencyGroup(GfxState * /*state*/, const double * /*bbox*/) {}
  virtual void setSoftMask(GfxState * /*state*/, const double * /*bbox*/, bool /*alpha*/,
			   Function * /*transferFunc*/, GfxColor * /*backdropColor*/) {}
  virtual void clearSoftMask(GfxState * /*state*/) {}

  //----- links
  virtual void processLink(AnnotLink * /*link*/) {}

#if 1 //~tmp: turn off anti-aliasing temporarily
  virtual bool getVectorAntialias() { return false; }
  virtual void setVectorAntialias(bool /*vaa*/) {}
#endif

#ifdef USE_CMS
  PopplerCache<Ref, GfxICCBasedColorSpace> *getIccColorSpaceCache() { return &iccColorSpaceCache; }
#endif

private:

  double defCTM[6];		// default coordinate transform matrix
  double defICTM[6];		// inverse of default CTM
  std::unique_ptr<std::unordered_map<std::string, ProfileData>> profileHash;

#ifdef USE_CMS
  PopplerCache<Ref, GfxICCBasedColorSpace> iccColorSpaceCache;
#endif
};

#endif