imageoutputdev.h

这是一个做pdf阅读器的源代码文件,是大家学习阅读器资料的很好参考

//========================================================================
//
// ImageOutputDev.h
//
// Copyright 1998-2003 Glyph & Cog, LLC
//
//========================================================================

#ifndef IMAGEOUTPUTDEV_H
#define IMAGEOUTPUTDEV_H

#include <aconf.h>

#ifdef USE_GCC_PRAGMAS
#pragma interface
#endif

#include <stdio.h>
#include "gtypes.h"
#include "OutputDev.h"

class GfxState;

//------------------------------------------------------------------------
// ImageOutputDev
//------------------------------------------------------------------------

class ImageOutputDev: public OutputDev {
public:

  // Create an OutputDev which will write images to files named
  // <fileRoot>-NNN.<type>.  Normally, all images are written as PBM
  // (.pbm) or PPM (.ppm) files.  If <dumpJPEG> is set, JPEG images are
  // written as JPEG (.jpg) files.
  ImageOutputDev(char *fileRootA, GBool dumpJPEGA);

  // Destructor.
  virtual ~ImageOutputDev();

  // Check if file was successfully created.
  virtual GBool isOk() { return ok; }

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

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

  //---- 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 GBool upsideDown() { return gTrue; }

  // Does this device use drawChar() or drawString()?
  virtual GBool useDrawChar() { return gFalse; }

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

private:

  char *fileRoot;		// root of output file names
  char *fileName;		// buffer for output file names
  GBool dumpJPEG;		// set to dump native JPEG files
  int imgNum;			// current image number
  GBool ok;			// set up ok?
};

#endif