/*  Part of XPCE --- The SWI-Prolog GUI toolkit

    Author:        Jan Wielemaker and Anjo Anjewierden
    E-mail:        jan@swi.psy.uva.nl
    WWW:           http://www.swi.psy.uva.nl/projects/xpce/
    Copyright (c)  1995-2011, University of Amsterdam
    All rights reserved.

    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions
    are met:

    1. Redistributions of source code must retain the above copyright
       notice, this list of conditions and the following disclaimer.

    2. Redistributions in binary form must reproduce the above copyright
       notice, this list of conditions and the following disclaimer in
       the documentation and/or other materials provided with the
       distribution.

    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
    "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
    LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
    FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
    COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
    INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
    BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
    LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
    CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
    LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
    ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
    POSSIBILITY OF SUCH DAMAGE.
*/

#include "include.h"

#undef roundup
#define valdigit(d)		((d) - '0')
#define rescale(v, o, n)	((v) * (n) / (o))


		 /*******************************
		 *     ASCII FORMAT PARSING	*
		 *******************************/

static int
getNum(IOSTREAM *fd)
{ int c;
  int v;

  for(;;)
  { do
    { c = Sgetc(fd);
    } while(isspace(c));

    if ( isdigit(c) )
    { v = valdigit(c);
      for(;;)
      { c = Sgetc(fd);
	if ( isdigit(c) )
	  v = v*10 + valdigit(c);
	else
	  break;
      }
      if ( !isspace(c) )
	Sungetc(c, fd);

      return v;
    }
    if ( c == '#' )
    { do
      { c = Sgetc(fd);
      } while( c != '\n' && c != EOF );
    } else
      return -1;
  }
}


HBITMAP
read_ppm_file(IOSTREAM *fd, Name *kind)
{ HBITMAP obm = 0, bm = 0;
  HDC hdc = 0;
  long here = Stell(fd);
  int c;
  int fmt, encoding;
  int width, height, scale=0;

  if ( (c=Sgetc(fd)) != 'P' )
  { Sungetc(c, fd);
    return NULL;
  }

  c = Sgetc(fd);
  if ( c < '1' || c > '9' )
    goto errout;
  c -= '0';
  fmt      = ((c - 1) % 3) + 1;
  encoding = c - fmt;

  width = getNum(fd);
  height = getNum(fd);

  if ( fmt == PNM_PBM )
  { *kind = NAME_bitmap;
  } else
  { *kind = NAME_pixmap;		/* or greymap */
    scale = getNum(fd);
  }

  if ( width < 0 || height < 0 || scale < 0 )
    goto errout;

/*hdc = CreateCompatibleDC(NULL);*/
  if ( fmt == PNM_PBM )
  { bm = ZCreateBitmap(width, height, 1, 1, NULL);
  } else
  { hdc = GetDC(NULL);

    bm = ZCreateCompatibleBitmap(hdc, width, height);
    ReleaseDC(NULL, hdc);
    hdc = 0;
  }
  if ( !bm )
  { Cprintf("read_ppm_file(): failed to create image\n");
    goto errout;
  }

  hdc = CreateCompatibleDC(NULL);
  obm = ZSelectObject(hdc, bm);

  switch(encoding)
  { int x, y;

    case PNM_ASCII:
    { switch(fmt)
      { case PNM_PBM:
	{ COLORREF on = RGB(0, 0, 0);
	  COLORREF off = RGB(255, 255, 255);

	  for(y=0; y<height; y++)
	  { for(x=0; x<width; x++)
	    { int value = getNum(fd);

	      if ( value < 0 || value > 1 )
		goto errout;

	      SetPixel(hdc, x, y, value ? on : off);
	    }
	  }
	  break;
	}
	case PNM_PGM:
	{ for(y=0; y<height; y++)
	  { for(x=0; x<width; x++)
	    { int g = getNum(fd);

	      if ( g < 0 || g > scale )
		goto errout;
	      if ( scale != 255 )
		g = rescale(g, scale, 255);

	      SetPixel(hdc, x, y, RGB(g, g, g));
	    }
	  }

	  break;
	}
	case PNM_PPM:
	{ for(y=0; y<height; y++)
	  { for(x=0; x<width; x++)
	    { int r = getNum(fd);
	      int g = getNum(fd);
	      int b = getNum(fd);

	      if ( r < 0 || r > scale ||
		   g < 0 || g > scale ||
		   b < 0 || b > scale )
		goto errout;

	      if ( scale != 255 )
	      { r = rescale(r, scale, 255);
		g = rescale(g, scale, 255);
		b = rescale(b, scale, 255);
	      }

	      SetPixel(hdc, x, y, RGB(r, g, b));
	    }
	  }

	  break;
	}
	break;
      }
      break;
    }
    case PNM_RAWBITS:
    { switch(fmt)
      { case PNM_PBM:
	{ int byte = 0;
	  int bit = 0;
	  COLORREF on = RGB(0, 0, 0);
	  COLORREF off = RGB(255, 255, 255);

	  for(y=0; y<height; y++)
	  { for(x=0; x<width; x++)
	    { if ( !bit )
	      { byte = Sgetc(fd);
		bit = 8;
	      }

	      bit--;
	      SetPixel(hdc, x, y, (byte & (1<<bit)) ? on : off);
	    }
	    bit = 0;
	  }
	  break;
	}
	case PNM_PGM:
	{ for(y=0; y<height; y++)
	  { for(x=0; x<width; x++)
	    { unsigned int g;

	      if ( Sfeof(fd) || (g=Sgetc(fd)) > scale )
		goto errout;
	      if ( scale != 255 )
		g = rescale(g, scale, 255);

	      SetPixel(hdc, x, y, RGB(g, g, g));
	    }
	  }

	  break;
	}
	case PNM_PPM:
	{ for(y=0; y<height; y++)
	  { for(x=0; x<width; x++)
	    { unsigned int r, g, b;

	      if ( Sfeof(fd) ||
		   (r=Sgetc(fd)) > scale ||
		   (g=Sgetc(fd)) > scale ||
		   (b=Sgetc(fd)) > scale )
		goto errout;

	      if ( scale != 255 )
	      { r = rescale(r, scale, 255);
		g = rescale(g, scale, 255);
		b = rescale(b, scale, 255);
	      }

	      SetPixel(hdc, x, y, RGB(r, g, b));
	    }
	  }

	  break;
	}
	break;
      }
      break;
    }
    case PNM_RUNLEN:
    { int rlen = 0;
      COLORREF cpixel = RGB(0,0,0);

      switch(fmt)
      { case PNM_PGM:
	{ DEBUG(NAME_pnm, Cprintf("Reading runlength encoded graymap\n"));

	  for(y=0; y<height; y++)
	  { for(x=0; x<width; x++)
	    { if ( rlen-- > 0 )
	      { SetPixel(hdc, x, y, cpixel);
	      } else
	      { unsigned int g;

		if ( (g=Sgetc(fd)) > scale ||
		     (rlen = Sgetc(fd)) == EOF )
		  goto errout;
		rlen &= 0xff;
		if ( scale != 255 )
		  g = rescale(g, scale, 255);

		cpixel = RGB(g, g, g);
		SetPixel(hdc, x, y, cpixel);
		rlen--;
	      }
	    }
	  }

	  break;
	}
	case PNM_PPM:
	{ for(y=0; y<height; y++)
	  { for(x=0; x<width; x++)
	    { if ( rlen-- > 0 )
	      { SetPixel(hdc, x, y, cpixel);
	      } else
	      { unsigned int r, g, b;

		if ( (r=Sgetc(fd)) > scale ||
		     (g=Sgetc(fd)) > scale ||
		     (b=Sgetc(fd)) > scale ||
		     (rlen = Sgetc(fd)) == EOF )
		  goto errout;

		rlen &= 0xff;
		if ( scale != 255 )
		{ r = rescale(r, scale, 255);
		  g = rescale(g, scale, 255);
		  b = rescale(b, scale, 255);
		}

		cpixel = RGB(r, g, b);

		SetPixel(hdc, x, y, cpixel);
		rlen--;
	      }
	    }
	  }

	  break;
	}
      }
    }
  }

  DEBUG(NAME_ppm, Cprintf("PNM: Converted %dx%d image\n", width, height));

  if ( hdc )
  { if ( obm )
      ZSelectObject(hdc, obm);
    DeleteDC(hdc);
  }

  return bm;

errout:
  Cprintf("PNM: Format error, index = %d\n", Stell(fd));

  if ( hdc )
  { if ( obm )
      ZSelectObject(hdc, obm);
    DeleteDC(hdc);
  }

  Sseek(fd, here, SIO_SEEK_SET);
  return NULL;
}


		 /*******************************
		 *	     WRITING		*
		 *******************************/


static int file_col;

static int
putNum(int n, IOSTREAM *fd)
{ if ( file_col != 0 && Sputc(' ', fd) == EOF )
    return -1;

  do
  { if ( Sputc(n % 10 + '0', fd) == EOF )
	return -1;
    file_col++;
    n /= 10;
  } while( n > 0 );

  if ( file_col >= 70 )
  { if ( Sputc('\n', fd) == EOF )
      return -1;
    file_col = 0;
  }

  return 0;
}


#undef BRIGHT
#define BRIGHT 255
#undef NOPIXEL
#define NOPIXEL (COLORREF) -1;

int
write_pnm_file(IOSTREAM *fd, HBITMAP bm, int scale, int fmt, int encode)
{ BITMAP bitmap;
  int width, height, depth;
  int x, y;
  HDC hdc;
  HBITMAP obm;

  if ( !GetObject(bm, sizeof(BITMAP), &bitmap) )
  { Cprintf("write_pnm_file(): GetObject() failed\n");
    return -1;
  }

  width  = bitmap.bmWidth;
  height = bitmap.bmHeight;
  depth  = bitmap.bmPlanes * bitmap.bmBitsPixel;

  if ( !scale )
    scale = 255;
  if ( !fmt && depth == 1 )
    fmt = PNM_PBM;

  hdc = CreateCompatibleDC(NULL);
  obm = ZSelectObject(hdc, bm);

  if ( fmt != PNM_PBM )
  { if ( !fmt )
    { for(y=0; y<height && !fmt; y++)
      { for(x=0; x<width; x++)
	{ COLORREF c = GetPixel(hdc, x, y);
	  BYTE r = GetRValue(c);
	  BYTE g = GetGValue(c);
	  BYTE b = GetBValue(c);

	  if ( r != g || r != b )
	  { fmt = PNM_PPM;
	    break;
	  }
	}
      }
      if ( !fmt )
	fmt = PNM_PGM;
    }
  } else if ( encode == PNM_RUNLEN )	/* no use to runlen encode a bitmap */
    encode = PNM_RAWBITS;

  Sfprintf(fd, "P%c\n", fmt + encode + '0');
  Sfprintf(fd, "# Creator: XPCE version %s\n",
	   strName(get(PCE, NAME_version, EAV)));
  if ( fmt != PNM_PBM )
  { Sfprintf(fd, "%d %d\n", width, height);
    Sfprintf(fd, "%d\n", scale);
  } else
    Sfprintf(fd, "%d %d\n", width, height);

  file_col = 0;

  switch(encode)
  { case PNM_ASCII:
    { switch(fmt)
      { case PNM_PBM:
	{ for(y=0; y<height; y++)
	  { for(x=0; x<width; x++)
	    { if ( putNum(GetPixel(hdc, x, y) ? 0 : 1, fd) < 0 )
		return -1;
	    }
	  }
	  break;
	}
	case PNM_PGM:
	{ for(y=0; y<height; y++)
	  { for(x=0; x<width; x++)
	    { COLORREF c = GetPixel(hdc, x, y);
	      unsigned int r = GetRValue(c);

	      if ( scale != 255 )
		r = rescale(r, BRIGHT, scale);

	      if ( putNum(r, fd) < 0 )
		return -1;
	    }
	  }
	  break;
	}
	case PNM_PPM:
	{ for(y=0; y<height; y++)
	  { for(x=0; x<width; x++)
	    { COLORREF c = GetPixel(hdc, x, y);
	      unsigned int r = GetRValue(c);
	      unsigned int g = GetGValue(c);
	      unsigned int b = GetBValue(c);

	      if ( scale != 255 )
	      { r = rescale(r, BRIGHT, scale);
		g = rescale(r, BRIGHT, scale);
		b = rescale(r, BRIGHT, scale);
	      }

	      if ( putNum(r, fd) < 0 ||
		   putNum(g, fd) < 0 ||
		   putNum(b, fd) < 0 )
		return -1;
	    }
	  }
	  break;
	}
      }
      if ( file_col && Sputc('\n', fd) == EOF )
	return -1;
      file_col = 0;
    }
    case PNM_RAWBITS:
    { switch(fmt)
      { case PNM_PBM:
	{ int byte = 0;
	  int bit = 7;

	  for(y=0; y<height; y++)
	  { for(x=0; x<width; x++)
	    { if ( !GetPixel(hdc, x, y) )
		byte |= 1<<bit;
	      if ( bit-- == 0 )
	      { if ( Sputc(byte, fd) == EOF )
		  return -1;
		bit = 7;
		byte = 0;
	      }
	    }
	    if ( bit != 7 )		/* flush the scanline */
	    { if ( Sputc(byte, fd) == EOF )
		return -1;
	      bit = 7;
	      byte = 0;
	    }
	  }

	  if ( bit != 7 )
	  { if ( Sputc(byte, fd) == EOF )
	      return -1;
	  }
	  break;
	}
	case PNM_PGM:
	{ for(y=0; y<height; y++)
	  { for(x=0; x<width; x++)
	    { COLORREF c = GetPixel(hdc, x, y);
	      unsigned int r = GetRValue(c);

	      if ( scale != 255 )
		r = rescale(r, BRIGHT, scale);

	      if ( Sputc(r, fd) == EOF )
		return -1;
	    }
	  }
	  break;
	}
	case PNM_PPM:
	{ for(y=0; y<height; y++)
	  { for(x=0; x<width; x++)
	    { COLORREF c = GetPixel(hdc, x, y);
	      unsigned int r = GetRValue(c);
	      unsigned int g = GetGValue(c);
	      unsigned int b = GetBValue(c);

	      if ( scale != 255 )
	      { r = rescale(r, BRIGHT, scale);
		g = rescale(r, BRIGHT, scale);
		b = rescale(r, BRIGHT, scale);
	      }

	      if ( Sputc(r, fd) == EOF ||
		   Sputc(g, fd) == EOF ||
		   Sputc(b, fd) == EOF )
		return -1;
	    }
	  }

	  break;
	}
      }
    }
    case PNM_RUNLEN:
    { int rlen=-1;
      COLORREF cpixel = NOPIXEL;

      switch(fmt)
      { case PNM_PGM:
	{ for(y=0; y<height; y++)
	  { for(x=0; x<width; x++)
	    { COLORREF pixel = GetPixel(hdc, x, y);

	      if ( pixel == cpixel && rlen < 255 )
		rlen++;
	      else
	      { int r;

		if ( rlen > 0 && Sputc(rlen, fd) == EOF )
		  return -1;
		cpixel = pixel;
		rlen = 1;
		r = GetRValue(pixel);
		if ( scale != 255 )
		  r = rescale(r, BRIGHT, scale);
  		if ( Sputc(r, fd) == EOF )
		  return -1;
	      }
	    }
	  }
	  if ( Sputc(rlen, fd) == EOF )
	    return -1;

	  break;
	}
	case PNM_PPM:
	{ for(y=0; y<height; y++)
	  { for(x=0; x<width; x++)
	    { COLORREF pixel = GetPixel(hdc, x, y);

	      if ( pixel == cpixel && rlen < 255 )
		rlen++;
	      else
	      { unsigned int r, g, b;

		if ( rlen > 0 && Sputc(rlen, fd) == EOF )
		  return -1;
		cpixel = pixel;
		rlen = 1;

		r = GetRValue(pixel);
		g = GetGValue(pixel);
		b = GetBValue(pixel);

		if ( scale != 255 )
		{ r = rescale(r, BRIGHT, scale);
		  g = rescale(r, BRIGHT, scale);
		  b = rescale(r, BRIGHT, scale);
		}

		if ( Sputc(r, fd) == EOF ||
		     Sputc(g, fd) == EOF ||
		     Sputc(b, fd) == EOF )
		  return -1;
	      }
	    }
	  }
	  if ( Sputc(rlen, fd) == EOF )
	    return -1;

	  break;
	}
      }
    }
  }

  ZSelectObject(hdc, obm);
  DeleteDC(hdc);

  return 0;
}