/*
 * Utilities for manipulating bitmap and metafile images for
 * the purposes of conversion to RTF
 *
 */

static char hexArray[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B',
  'C', 'D', 'E', 'F' };

void DecToHex(int dec, char *buf)
{
  int firstDigit = (int)(dec/16.0);
  int secondDigit = (int)(dec - (firstDigit*16.0));
  buf[0] = hexArray[firstDigit];
  buf[1] = hexArray[secondDigit];
  buf[2] = 0;
}
 
static unsigned int getshort(FILE *fp)
{
  int c, c1;
  c = getc(fp);  c1 = getc(fp);
  return ((unsigned int) c) + (((unsigned int) c1) << 8);
}

static unsigned long getint(FILE *fp)
{
  int c, c1, c2, c3;
  c = getc(fp);  c1 = getc(fp);  c2 = getc(fp);  c3 = getc(fp);
  return (long)((long) c) +
         (((long) c1) << 8) + 
	 (((long) c2) << 16) +
	 (((long) c3) << 24);
}

Bool GetBMPHeader(FILE *fp, int *Width, int *Height, int *Planes, int *BitsPerPixel)
{
  unsigned long bfSize, bfOffBits, biSize, biWidth, biHeight, biPlanes;
  unsigned long biBitCount, biCompression, biSizeImage, biXPelsPerMeter;
  unsigned long biYPelsPerMeter, biClrUsed, biClrImportant;

  /* read the file type (first two bytes) */
  int c = getc(fp); int c1 = getc(fp);
  if (c!='B' || c1!='M') { return FALSE; }

  bfSize = getint(fp);
  getshort(fp);         /* reserved and ignored */
  getshort(fp);
  bfOffBits = getint(fp);

  biSize          = getint(fp);
  biWidth         = getint(fp);
  biHeight        = getint(fp);
  biPlanes        = getshort(fp);
  biBitCount      = getshort(fp);
  biCompression   = getint(fp);
  biSizeImage     = getint(fp);
  biXPelsPerMeter = getint(fp);
  biYPelsPerMeter = getint(fp);
  biClrUsed       = getint(fp);
  biClrImportant  = getint(fp);

  *Width = (int)biWidth;
  *Height = (int)biHeight;
  *Planes = (int)biPlanes;
  *BitsPerPixel = (int)biBitCount;

//  fseek(fp, bfOffBits, SEEK_SET);
  
  return TRUE;
}

static int scanLineWidth = 0;

Bool OutputBitmapHeader(FILE *fd, Bool isWinHelp = FALSE)
{
  int Width, Height, Planes, BitsPerPixel;
  if (!GetBMPHeader(fd, &Width, &Height, &Planes, &BitsPerPixel))
    return FALSE;

  scanLineWidth = (int)(Width/(8/BitsPerPixel));
  if ((float)((int)(scanLineWidth/2.0)) != (float)(scanLineWidth/2.0))
    scanLineWidth ++;
    
  int goalW = 15*Width;
  int goalH = 15*Height;

  TexOutput("{\\pict");
  if (isWinHelp) TexOutput("\\wbitmap0");
  else TexOutput("\\dibitmap");

  char buf[50];
  TexOutput("\\picw"); sprintf(buf, "%d", Width); TexOutput(buf);
  TexOutput("\\pich"); sprintf(buf, "%d", Height); TexOutput(buf);
  TexOutput("\\wbmbitspixel"); sprintf(buf, "%d", BitsPerPixel); TexOutput(buf);
  TexOutput("\\wbmplanes"); sprintf(buf, "%d", Planes); TexOutput(buf);
  TexOutput("\\wbmwidthbytes"); sprintf(buf, "%d", scanLineWidth); TexOutput(buf);
  TexOutput("\\picwgoal"); sprintf(buf, "%d", goalW); TexOutput(buf);
  TexOutput("\\pichgoal"); sprintf(buf, "%d", goalH); TexOutput(buf);
  TexOutput("\n");
  return TRUE;
}


Bool OutputBitmapData(FILE *fd)
{
  fseek(fd, 14, SEEK_SET);
  int bytesSoFar = 0;
  int ch = getc(fd);
  char hexBuf[3];
  while (ch != EOF)
  {
    if (bytesSoFar == scanLineWidth)
    {
      bytesSoFar = 0;
      TexOutput("\n");
    }
    DecToHex(ch, hexBuf);
    TexOutput(hexBuf);
    bytesSoFar ++;
    ch = getc(fd);
  }
  TexOutput("\n}\n");
  return TRUE;
}

#ifdef wx_msw
struct mfPLACEABLEHEADER {
	DWORD	key;
	HANDLE	hmf;
	RECT	bbox;
	WORD	inch;
	DWORD	reserved;
	WORD	checksum;
};

// Returns size in TWIPS
Bool GetMetafileHeader(FILE *handle, int *width, int *height)
{
  char buffer[40];
  mfPLACEABLEHEADER *theHeader = (mfPLACEABLEHEADER *)&buffer;
  fread((void *)theHeader, sizeof(char), sizeof(mfPLACEABLEHEADER), handle);
  if (theHeader->key != 0x9AC6CDD7)
  {
    return FALSE;
  }

  float widthInUnits = (float)theHeader->bbox.right - theHeader->bbox.left;
  float heightInUnits = (float)theHeader->bbox.bottom - theHeader->bbox.top;
  *width = (int)((widthInUnits*1440.0)/theHeader->inch);
  *height = (int)((heightInUnits*1440.0)/theHeader->inch);
  return TRUE;
}

Bool OutputMetafileHeader(FILE *handle, Bool isWinHelp, int userWidth, int userHeight)
{
  int Width, Height;
  if (!GetMetafileHeader(handle, &Width, &Height))
    return FALSE;

  scanLineWidth = 64;
  int goalW = Width;
  int goalH = Height;

  // Scale to user's dimensions if we have the information
  if (userWidth > 0 && userHeight == 0)
  {
    double scaleFactor = ((double)userWidth/(double)goalW);
    goalW = userWidth;
    goalH = (int)((goalH * scaleFactor) + 0.5);
  }
  else if (userWidth == 0 && userHeight > 0)
  {
    double scaleFactor = ((double)userHeight/(double)goalH);
    goalH = userHeight;
    goalW = (int)((goalW * scaleFactor) + 0.5);
  }
  else if (userWidth > 0 && userHeight > 0)
  {
    goalW = userWidth;
    goalH = userHeight;
  }

  TexOutput("{\\pict");
  TexOutput("\\wmetafile8");

  char buf[50];
  TexOutput("\\picw"); sprintf(buf, "%d", Width); TexOutput(buf);
  TexOutput("\\pich"); sprintf(buf, "%d", Height); TexOutput(buf);
  TexOutput("\\picwgoal"); sprintf(buf, "%d", goalW); TexOutput(buf);
  TexOutput("\\pichgoal"); sprintf(buf, "%d", goalH); TexOutput(buf);
  TexOutput("\n");
  return TRUE;
}

Bool OutputMetafileData(FILE *handle)
{
  int bytesSoFar = 0;
  char hexBuf[3];
  int ch;
  do
  {
    ch = getc(handle);  
    if (bytesSoFar == scanLineWidth)
    {
      bytesSoFar = 0;
      TexOutput("\n");
    }
    if (ch != EOF)
    {
      DecToHex(ch, hexBuf);
      TexOutput(hexBuf);
      bytesSoFar ++;
    }
  } while (ch != EOF);
  TexOutput("\n}\n");
  return TRUE;
}

#endif