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gif2epsn.c

/*****************************************************************************
*   "Gif-Lib" - Yet another gif library.                         *
*                                                          *
* Written by:  Gershon Elber                    Ver 0.1, Jul. 1989   *
******************************************************************************
* Program to dump GIF file into EPSON type printers                    *
* Options:                                                 *
* -q : quiet printing mode.                                      *
* -d factor : use dithering of matrix of size factor by factor.              *
* -t level : set the threshold level of white in the result (0..100).        *
* -m mapping : methods for mapping the 24bits colors into 1 BW bit.          *
* -p printer : specify printer to print to (lpt1: by default).               *
* -n : nice mode : uses double density to achieve better quality.      *
* -i : invert the image.                                         *
* -h : on-line help.                                             *
******************************************************************************
* History:                                                 *
* 15 Jul 89 - Version 1.0 by Gershon Elber.                            *
* 22 Dec 89 - Fix problems with const strings been modified (Version 1.1).   *
*****************************************************************************/

#ifdef __MSDOS__
#include <graphics.h>
#include <stdlib.h>
#include <alloc.h>
#include <io.h>
#include <dos.h>
#include <bios.h>
#endif /* __MSDOS__ */

#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <fcntl.h>
#include "gif_lib.h"
#include "gagetarg.h"

#define PROGRAM_NAME    "Gif2Epsn"

#define     C2BW_BACK_GROUND  0 /*Methods to map 24bits Colors to 1 BW bit.*/
#define     C2BW_GREY_LEVELS  1
#define C2BW_DITHER           2
#define C2BW_NUM_METHODS      3             /* Always hold # of methods. */

#define DEFAULT_THRESHOLD     5000       /* Color->BW threshold level. */

#define DITHER_MIN_MATRIX     2
#define DITHER_MAX_MATRIX     4

/* The epson specific are defined here: */
#define EPSON_WIDTH           80                  /* 80 char per line. */
#define EPSON_PIXEL_2_CHAR    8      /* 8 pixels per char, in REG_DENSITY. */

#define EPSON_ESC       "\033"          /* Actually regular escape char. */
#define EPSON_RESET           "\033@"                  /* Reset the printer. */
#define EPSON_VERTICAL_SPACE  "\033A\010"         /* 8/72 inch vertically. */
#define EPSON_REG_DENSITY     "\033K"           /* 640 pixels per 7.5" (line). */
#define EPSON_DUAL_DENSITY    "\033L"          /* 1280 pixels per 7.5" (line). */

#ifdef __MSDOS__
extern unsigned int
    _stklen = 16384;                     /* Increase default stack size. */
#endif /* __MSDOS__ */

#ifdef SYSV
static char *VersionStr =
        "Gif toolkit module,\t\tGershon Elber\n\
      (C) Copyright 1989 Gershon Elber.\n";
static char
    *CtrlStr = "Gif2Epsn q%- d%-DitherSize!d t%-BWThreshold!d m%-Mapping!d i%- n%- p%-PrinterName!s h%- GifFile!*s";
#else
static char
    *VersionStr =
      PROGRAM_NAME
      GIF_LIB_VERSION
      "     Gershon Elber,    "
      __DATE__ ",   " __TIME__ "\n"
      "(C) Copyright 1989 Gershon Elber.\n";
static char
    *CtrlStr =
      PROGRAM_NAME
      " q%- d%-DitherSize!d t%-BWThreshold!d m%-Mapping!d i%- n%- p%-PrinterName!s h%- GifFile!*s";
#endif /* SYSV */

static char
    *PrinterName = NULL;
/* Make some variables global, so we could access them faster: */
static int
    ImageNum = 0,
    BackGround = 0,
    DitherSize = 2, DitherFlag = FALSE,
    BWThresholdFlag = FALSE, Threshold,
    BWThreshold = DEFAULT_THRESHOLD,         /* Color->BW mapping threshold. */
    Mapping, MappingFlag = FALSE,
    InvertFlag = FALSE,
    NiceFlag = FALSE,
    PrinterFlag = FALSE,
    HelpFlag = FALSE,
    ColorToBWMapping = C2BW_BACK_GROUND,
    InterlacedOffset[] = { 0, 4, 2, 1 }, /* The way Interlaced image should  */
    InterlacedJumps[] = { 8, 8, 4, 2 };    /* be read - offsets and jumps... */
static GifColorType
    *ColorMap;

static void EvalDitheredScanline(GifRowType *ScreenBuffer, int Row,
                              int RowSize, GifRowType *DitherBuffer);
static void DumpScreen2Epsn(GifRowType *ScreenBuffer,
                              int ScreenWidth, int ScreenHeight);
static void PutString(FILE *Prt, int DirectPrint, char *Str, int Len);
static void PutString2(FILE *Prt, int DirectPrint, char *Str, int Len);

/******************************************************************************
* Interpret the command line and scan the given GIF file.               *
******************************************************************************/
void main(int argc, char **argv)
{
    int     i, j, Error, NumFiles, Size, Row, Col, Width, Height, ExtCode, Count;
    GifRecordType RecordType;
    GifByteType *Extension;
    char **FileName = NULL;
    GifRowType *ScreenBuffer;
    GifFileType *GifFile;

    if ((Error = GAGetArgs(argc, argv, CtrlStr,
            &GifQuietPrint, &DitherFlag, &DitherSize,
            &BWThresholdFlag, &Threshold,
            &MappingFlag, &Mapping, &InvertFlag,
            &NiceFlag, &PrinterFlag, &PrinterName, &HelpFlag,
            &NumFiles, &FileName)) != FALSE ||
            (NumFiles > 1 && !HelpFlag)) {
      if (Error)
          GAPrintErrMsg(Error);
      else if (NumFiles > 1)
          GIF_MESSAGE("Error in command line parsing - one GIF file please.");
      GAPrintHowTo(CtrlStr);
      exit(1);
    }

    if (HelpFlag) {
      fprintf(stderr, VersionStr);
      GAPrintHowTo(CtrlStr);
      exit(0);
    }

    if (!PrinterFlag) PrinterName = "";

    if (DitherFlag) {
      /* Make sure we are o.k.: */
      if (DitherSize > DITHER_MAX_MATRIX) DitherSize = DITHER_MAX_MATRIX;
      if (DitherSize < DITHER_MIN_MATRIX) DitherSize = DITHER_MAX_MATRIX;
    }

    /* As Threshold is in [0..100] range and BWThreshold is [0..25500]: */
    if (BWThresholdFlag) {
      if (Threshold > 100 || Threshold < 0)
          GIF_EXIT("Threshold not in 0..100 percent.");
      BWThreshold = Threshold * 255;
      if (BWThreshold == 0) BWThreshold = 1;   /* Overcome divide by zero! */
    }

    /* No message is emitted, but mapping method is clipped to exists method.*/
    if (MappingFlag) ColorToBWMapping = Mapping % C2BW_NUM_METHODS;

    if (NumFiles == 1) {
      if ((GifFile = DGifOpenFileName(*FileName)) == NULL) {
          PrintGifError();
          exit(-1);
      }
    }
    else {
      /* Use the stdin instead: */

#ifdef __MSDOS__
      setmode(0, O_BINARY);
#endif /* __MSDOS__ */
      if ((GifFile = DGifOpenFileHandle(0)) == NULL) {
          PrintGifError();
          exit(-1);
      }
    }

    /* Allocate the screen as vector of column of rows. We cannt allocate    */
    /* the all screen at once, as this broken minded CPU can allocate up to  */
    /* 64k at a time and our image can be bigger than that:            */
    /* Note this screen is device independent - its the screen as defined by */
    /* the GIF file parameters itself.                                 */
    if ((ScreenBuffer = (GifRowType *)
      malloc(GifFile->SHeight * sizeof(GifRowType *))) == NULL)
          GIF_EXIT("Failed to allocate memory required, aborted.");

    Size = GifFile->SWidth * sizeof(GifPixelType);/* Size in bytes one row.*/
    if ((ScreenBuffer[0] = (GifRowType) malloc(Size)) == NULL) /* First row. */
      GIF_EXIT("Failed to allocate memory required, aborted.");

    for (i = 0; i < GifFile->SWidth; i++) /* Set its color to BackGround. */
      ScreenBuffer[0][i] = GifFile->SBackGroundColor;
    for (i = 1; i < GifFile->SHeight; i++) {
      /* Allocate the other rows, andset their color to background too:   */
      if ((ScreenBuffer[i] = (GifRowType) malloc(Size)) == NULL)
          GIF_EXIT("Failed to allocate memory required, aborted.\n");

      memcpy(ScreenBuffer[i], ScreenBuffer[0], Size);
    }

    /* Scan the content of the GIF file and load the image(s) in: */
    do {
      if (DGifGetRecordType(GifFile, &RecordType) == GIF_ERROR) {
          PrintGifError();
          exit(-1);
      }
      switch (RecordType) {
          case IMAGE_DESC_RECORD_TYPE:
            if (DGifGetImageDesc(GifFile) == GIF_ERROR) {
                PrintGifError();
                exit(-1);
            }
            Row = GifFile->Image.Top; /* Image Position relative to Screen. */
            Col = GifFile->Image.Left;
            Width = GifFile->Image.Width;
            Height = GifFile->Image.Height;
            GifQprintf("\n%s: Image %d at (%d, %d) [%dx%d]:     ",
                PROGRAM_NAME, ++ImageNum, Col, Row, Width, Height);
            if (GifFile->Image.Left + GifFile->Image.Width > GifFile->SWidth ||
               GifFile->Image.Top + GifFile->Image.Height > GifFile->SHeight) {
                fprintf(stderr, "Image %d is not confined to screen dimension, aborted.\n");
                exit(-2);
            }
            if (GifFile->Image.Interlace) {
                /* Need to perform 4 passes on the images: */
                for (Count = i = 0; i < 4; i++)
                  for (j = Row + InterlacedOffset[i]; j < Row + Height;
                                     j += InterlacedJumps[i]) {
                      GifQprintf("\b\b\b\b%-4d", Count++);
                      if (DGifGetLine(GifFile, &ScreenBuffer[j][Col],
                        Width) == GIF_ERROR) {
                        PrintGifError();
                        exit(-1);
                      }
                  }
            }
            else {
                for (i = 0; i < Height; i++) {
                  GifQprintf("\b\b\b\b%-4d", i);
                  if (DGifGetLine(GifFile, &ScreenBuffer[Row++][Col],
                        Width) == GIF_ERROR) {
                      PrintGifError();
                      exit(-1);
                  }
                }
            }
            break;
          case EXTENSION_RECORD_TYPE:
            /* Skip any extension blocks in file: */
            if (DGifGetExtension(GifFile, &ExtCode, &Extension) == GIF_ERROR) {
                PrintGifError();
                exit(-1);
            }
            while (Extension != NULL) {
                if (DGifGetExtensionNext(GifFile, &Extension) == GIF_ERROR) {
                  PrintGifError();
                  exit(-1);
                }
            }
            break;
          case TERMINATE_RECORD_TYPE:
            break;
          default:                /* Should be traps by DGifGetRecordType. */
            break;
      }
    }
    while (RecordType != TERMINATE_RECORD_TYPE);

    /* Lets display it - set the global variables required and do it: */
    BackGround = GifFile->SBackGroundColor;
    ColorMap = (GifFile->Image.ColorMap ? GifFile->Image.ColorMap->Colors :
                               GifFile->SColorMap->Colors);
    DumpScreen2Epsn(ScreenBuffer, GifFile->SWidth, GifFile->SHeight);

    if (DGifCloseFile(GifFile) == GIF_ERROR) {
      PrintGifError();
      exit(-1);
    }
}

/*****************************************************************************
* Routine to evaluate dithered scanlines out of given ones, using Size       *
* dithering matrix, starting from Row. The given scanlines are NOT modified. *
*****************************************************************************/
static void EvalDitheredScanline(GifRowType *ScreenBuffer, int Row,
                              int RowSize, GifRowType *DitherBuffer)
{
    static char Dither2[2][2] = {    /* See Foley & Van Dam pp. 597-601. */
      { 1, 3 },
      { 4, 2 }
    };
    static char Dither3[3][3] = {
      { 7, 9, 5 },
      { 2, 1, 4 },
      { 6, 3, 8 }
    };
    static char Dither4[4][4] = {
      { 1,  9,  3,  11 },
      { 13, 5,  15, 7 },
      { 4,  12, 2,  10 },
      { 16, 8,  14, 6 }
    };
    int i, j, k, Level;
    long Intensity;
    GifColorType *ColorMapEntry;

    /* Scan the Rows (Size rows) evaluate intensity every Size pixel and use */
    /* the dither matrix to set the dithered result;                   */
    for (i = 0; i <= RowSize - DitherSize; i += DitherSize) {
      Intensity = 0;
      for (j = Row; j < Row + DitherSize; j++)
          for (k = 0; k < DitherSize; k++) {
            ColorMapEntry = &ColorMap[ScreenBuffer[j][i+k]];
            Intensity += 30 * ((int) ColorMapEntry->Red) +
                       59 * ((int) ColorMapEntry->Green) +
                       11 * ((int) ColorMapEntry->Blue);
          }

      /* Find the intensity level (between 0 and Size^2) of our matrix:    */
      /* Expression is "Intensity * BWThreshold / (25500 * DefThresh)"     */
      /* but to prevent from overflow in the long evaluation we do this:   */
      Level = ((Intensity / 2550) * ((long) DEFAULT_THRESHOLD) /
                                    (((long) BWThreshold) * 10));
      switch (DitherSize) {
          case 2:     
            for (j = 0; j < DitherSize; j++)
                for (k = 0; k < DitherSize; k++)
                  DitherBuffer[j][i+k] = Dither2[j][k] <= Level;
            break;
          case 3:
            for (j = 0; j < DitherSize; j++)
                for (k = 0; k < DitherSize; k++)
                  DitherBuffer[j][i+k] = Dither3[j][k] <= Level;
            break;
          case 4:
            for (j = 0; j < DitherSize; j++)
                for (k = 0; k < DitherSize; k++)
                  DitherBuffer[j][i+k] = Dither4[j][k] <= Level;
            break;
      }
    }
}

/******************************************************************************
* The real dumping routine. Few things are taken into account:                *
* 1. The Nice flag. If TRUE each pixel is printed twice in double density.    *
* 2. The Invert flag. If TRUE each pixel before drawn is inverted.            *
* 3. The rendering mode and dither matrix flag if dithering is selected.      *
*   The image is drawn from ScreenBuffer ScreenTop/Left in the bottom/right   *
* directions.                                                     *
*   Unfortunatelly, there is a BUG in DOS that does not handle ctrl-Z         *
* correctly if we open lptx: device in binary mode (should treat it as any    *
* other char). Therefore I had to write to it directly using biosprint. I     *
* dont like it either, and if you have better way to do it, let me know.      *
******************************************************************************/
static void DumpScreen2Epsn(GifRowType *ScreenBuffer,
                              int ScreenWidth, int ScreenHeight)
{
    int i, j, p, Size, LeftCWidth, Len, DirectPrint = 0,
      DitheredLinesLeft = 0, DitheredLinesCount = 0, MapInvert[2];
    char LinePrefixLen[2];                     /* Length of scan line. */
    GifByteType *EpsonBuffer;
    GifPixelType *Line;
    GifRowType *DitherBuffer;
    GifColorType *ColorMapEntry;
    FILE *Prt = NULL;

#ifdef __MSDOS__
    for (i = 0;    i < strlen(PrinterName); i++)
      if (islower(PrinterName[i]))
          PrinterName[i] = toupper(PrinterName[i]);

    if (strcmp(PrinterName, "LPT1") == 0 ||
      strcmp(PrinterName, "PRN") == 0)
      DirectPrint = 1;
    else if (strcmp(PrinterName, "LPT2") == 0)
        DirectPrint = 2;
    else if (strcmp(PrinterName, "LPT3") == 0)
        DirectPrint = 3;
#endif /* __MSDOS__ */

    if (!DirectPrint) {
#ifdef __MSDOS__
      if (strlen(PrinterName) == 0) {
          setmode(1, O_BINARY);       /* Make sure it is in binary mode. */
          Prt = stdout;
      }
      else if ((Prt = fopen(PrinterName, "wb")) == NULL ||
             setvbuf(Prt, NULL, _IOFBF, GIF_FILE_BUFFER_SIZE))
#else
      if (strlen(PrinterName) == 0)
          Prt = stdout;
      else if ((Prt = fopen(PrinterName, "w")) == NULL)
#endif /* __MSDOS__ */
          GIF_EXIT("Failed to open output (printer) file.");
    }

    if ((EpsonBuffer = (GifByteType *) malloc(ScreenWidth)) == NULL)
      GIF_EXIT("Failed to allocate memory required, aborted.");

    /* Allocate the buffer to save the dithered information. */
    if (ColorToBWMapping == C2BW_DITHER) {
      if ((DitherBuffer = (GifRowType *)
          malloc(DITHER_MAX_MATRIX * sizeof(GifRowType *))) != NULL) {
          Size = ScreenWidth * sizeof(GifPixelType);   /* Size of one row. */
          for (i = 0; i < DITHER_MAX_MATRIX; i++) {
            if ((DitherBuffer[i] = (GifRowType) malloc(Size)) == NULL) {
                DitherBuffer = NULL;
                break;
            }
          }
      }
      if (DitherBuffer == NULL)
          GIF_EXIT("Failed to allocate memory required, aborted.");
    }
    else
      DitherBuffer = NULL;

    /* Reset the printer, and make sure no space between adjacent lines: */
    PutString(Prt, DirectPrint, EPSON_RESET, 2);
    PutString(Prt, DirectPrint, EPSON_VERTICAL_SPACE, 3);

    /* Prepar left spacing to begin with, so image will be in the middle.    */
    LeftCWidth = (EPSON_WIDTH - (ScreenWidth / EPSON_PIXEL_2_CHAR)) / 2;

    if (InvertFlag) {            /* Make the inversion as fast a possible. */
      MapInvert[0] = 1;
      MapInvert[1] = 0;
    }
    else {
      MapInvert[0] = 0;
      MapInvert[1] = 1;
    }

    for (i = 0, p = 0; i < ScreenHeight; i++, p++) {
      GifQprintf("\b\b\b\b%-4d", ScreenHeight - i);
      Line = ScreenBuffer[i];

      /* If 8 lines were accumulated in printer buffer - dump them out.    */
      if (p == 8) {
          for (Len = ScreenWidth-1; Len >= 0; Len--)
              if (EpsonBuffer[Len]) break;

          /* Only in case this line is not empty: */
          if (Len++ >= 0) {
            /* Make the left space, so image will be centered: */
            for (j = 0; j < LeftCWidth; j++)
                PutString(Prt, DirectPrint,  " ", 1);

            /* Full printer line is ready to be dumped - send it out: */
            if (NiceFlag) {
                PutString(Prt, DirectPrint, EPSON_DUAL_DENSITY, 2);
                LinePrefixLen[0] = (Len * 2) % 256;
                LinePrefixLen[1] = (Len * 2) / 256;
                PutString(Prt, DirectPrint, LinePrefixLen, 2);
                PutString2(Prt, DirectPrint, (char *) EpsonBuffer, Len);
            }
            else {
                PutString(Prt, DirectPrint, EPSON_REG_DENSITY, 2);
                LinePrefixLen[0] = Len % 256;
                LinePrefixLen[1] = Len / 256;
                PutString(Prt, DirectPrint, LinePrefixLen, 2);
                PutString(Prt, DirectPrint, (char *) EpsonBuffer, Len);
            }
          }
          PutString(Prt, DirectPrint, "\015\012", 2);
          p = 0;
      }

      /* We decide right here what method to map Colors to BW so the inner */
      /* loop will be independent of it (and therefore faster):        */
      switch(ColorToBWMapping) {
          case C2BW_BACK_GROUND:
            for (j = 0; j < ScreenWidth; j++)
                EpsonBuffer[j] = (EpsonBuffer[j] << 1) +
                              MapInvert[Line[j] != BackGround];
            break;
          case C2BW_GREY_LEVELS:
            for (j = 0; j < ScreenWidth; j++) {
                ColorMapEntry = &ColorMap[Line[j]];
                /* For the transformation from RGB to BW, see Folley &   */
                /* Van Dam pp 613: The Y channel is the BW we need:          */
                /* As colors are 255 maximum, the result can be up to    */
                /* 25500 which is still in range of our 16 bits integers */
                EpsonBuffer[j] = (EpsonBuffer[j] << 1) +
                  MapInvert[(30 * (int) ColorMapEntry->Red) +
                           59 * ((int) ColorMapEntry->Green) +
                           11 * ((int) ColorMapEntry->Blue) >
                              BWThreshold];
            }
            break;
          case C2BW_DITHER:
            if (DitheredLinesLeft-- == 0) {
                EvalDitheredScanline(ScreenBuffer,
                  (i < ScreenHeight - DitherSize ? i :
                                     ScreenHeight - DitherSize),
                  ScreenWidth, DitherBuffer);
                DitheredLinesLeft = DitherSize - 1;
                DitheredLinesCount = 0;
            }
            Line = DitherBuffer[DitheredLinesCount++];
            for (j = 0; j < ScreenWidth; j++)
                EpsonBuffer[j] = (EpsonBuffer[j] << 1) +
                                          MapInvert[Line[j]];
            break;
      }
    }

    /* If buffer in incomplete - complete it and dump it out: */
    if (p != 0) {
      for (Len = ScreenWidth - 1; Len >= 0; Len--)
          if (EpsonBuffer[Len]) break;
      if (Len++ >= 0) {
          i = 8 - p;                             /* Amount to shift. */
          for (j = 0; j < ScreenWidth; j++) EpsonBuffer[j] <<= i;

          /* Make the left space, so image will be centered: */
          for (j = 0; j < LeftCWidth; j++)
            PutString(Prt, DirectPrint, " ", 1);

          if (NiceFlag) {
            PutString(Prt, DirectPrint, EPSON_DUAL_DENSITY, 2);
            LinePrefixLen[0] = (Len * 2) % 256;
            LinePrefixLen[1] = (Len * 2) / 256;
            PutString(Prt, DirectPrint, LinePrefixLen, 2);
            PutString2(Prt, DirectPrint, (char *) EpsonBuffer, Len);
          }
          else {
            PutString(Prt, DirectPrint, EPSON_REG_DENSITY, 2);
            LinePrefixLen[0] = Len % 256;
            LinePrefixLen[1] = Len / 256;
            PutString(Prt, DirectPrint, LinePrefixLen, 2);
            PutString(Prt, DirectPrint, (char *) EpsonBuffer, Len);
          }
      }
      PutString(Prt, DirectPrint, "\015\012", 2);
    }

    fclose(Prt);
}

/******************************************************************************
* Dumps the string of given length, to Prt. No char in Str has special        *
* meaning, and even zero (NULL) chars are dumped.                       *
* If however DirectPrint is non zero, string is dumped to specifed lpt port.  *
******************************************************************************/
static void PutString(FILE *Prt, int DirectPrint, char *Str, int Len)
{
    int i;

    if (DirectPrint) {
#ifdef __MSDOS__
      for (i = 0; i < Len; i++) biosprint(0, Str[i], DirectPrint - 1);
#else
      GIF_EXIT("Can not print directly to a printer if not MSDOS.");
#endif /* __MSDOS__ */
    }
    else
      for (i = 0; i < Len; i++) fputc(Str[i], Prt);
}

/******************************************************************************
* Dumps the string of given length, to Prt. No char in Str has special        *
* meaning, and even zero (NULL) chars are dumped. Every char is dumped twice. *
* If however DirectPrint is non zero, string is dumped to specifed lpt port.  *
******************************************************************************/
static void PutString2(FILE *Prt, int DirectPrint, char *Str, int Len)
{
    int i;

    if (DirectPrint) {
#ifdef __MSDOS__
      for (i = 0; i < Len; i++) {
          biosprint(0, Str[i], DirectPrint - 1);
          biosprint(0, Str[i], DirectPrint - 1);
      }
#else
      GIF_EXIT("Can not print directly to a printer if not MSDOS.");
#endif /* __MSDOS__ */
    }
    else
      for (i = 0; i < Len; i++) {
          fputc(Str[i], Prt);
          fputc(Str[i], Prt);
      }
}

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