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gif2ps.c

/*****************************************************************************
*   "Gif-Lib" - Yet another gif library.                         *
*                                                          *
* Written by:  Gershon Elber                    Ver 0.1, Jul. 1989   *
******************************************************************************
* Program to dump GIF file into PostScript type printers               *
* Options:                                                 *
* -q : quiet printing mode.                                      *
* -x : force image to be horizontal.                                   *
* -y : force image to be vertical.                               *
* -s x y : force image to be of given size.                            *
* -p x y : force image to be positioned at given position in page.           *
* -i : invert the image.                                         *
* -n n : number of copies.                                       *
* -h : on-line help.                                             *
******************************************************************************
* History:                                                 *
* 22 Dec 89 - Version 1.0 by Gershon Elber.                            *
*****************************************************************************/

#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    "Gif2PS"

#define PAGE_WIDTH      7.5             /* All dimensions are in inches. */
#define PAGE_HEIGHT     9.0
#define FULL_PAGE_WIDTH 8.5
#define FULL_PAGE_HEIGHT 11.0

#define UNKNOWN_ORIENT        0
#define HORIZONTAL_ORIENT     1 
#define VERTICAL_ORIENT       2

#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 = "Gif2PS q%- x%- y%- s%-SizeX|SizeY!F!F p%-PosX|PosY!F!F i%- n%-#Copies!d 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%- x%- y%- s%-SizeX|SizeY!F!F p%-PosX|PosY!F!F i%- n%-#Copies!d h%- GifFile!*s";
#endif /* SYSV */

/* Make some variables global, so we could access them faster: */
static int
    ImageNum = 0,
    BackGround = 0,
    ForceXFlag = FALSE,
    ForceYFlag = FALSE,
    SizeFlag = FALSE,
    PosFlag = FALSE,
    InvertFlag = FALSE,
    NumCopiesFlag = FALSE,
    HelpFlag = FALSE,
    NumOfCopies = 1,
    InterlacedOffset[] = { 0, 4, 2, 1 }, /* The way Interlaced image should. */
    InterlacedJumps[] = { 8, 8, 4, 2 },    /* be read - offsets and jumps... */
    PSOrientation;
static double PSSizeX, PSSizeY, PSPosX, PSPosY;
static GifColorType
    *ColorMap;

static void DumpScreen2PS(GifRowType *ScreenBuffer,
                              int ScreenWidth, int ScreenHeight);
static void PutString(unsigned char *Line, 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,
            &ForceXFlag, &ForceYFlag, &SizeFlag, &PSSizeX, &PSSizeY,
            &PosFlag, &PSPosX, &PSPosY,
            &InvertFlag, &NumCopiesFlag, &NumOfCopies, &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 (ForceXFlag)
        PSOrientation = HORIZONTAL_ORIENT;
    else if (ForceYFlag)
        PSOrientation = VERTICAL_ORIENT;
    else
      PSOrientation = UNKNOWN_ORIENT;

    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, and set their color to background too:  */
      if ((ScreenBuffer[i] = (GifRowType) malloc(Size)) == NULL)
          GIF_EXIT("Failed to allocate memory required, aborted.");

      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);
    DumpScreen2PS(ScreenBuffer, GifFile->SWidth, GifFile->SHeight);

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

/******************************************************************************
* The real dumping routine.                                       *
******************************************************************************/
static void DumpScreen2PS(GifRowType *ScreenBuffer,
                              int ScreenWidth, int ScreenHeight)
{
    int i, j;
    double Aspect;
    GifByteType *OutLine, Data;
    GifPixelType *Line;
    GifColorType *ColorMapEntry;

    /* If user did not enforce orientation, pick the best one. */
    if (PSOrientation == UNKNOWN_ORIENT)
      if (ScreenWidth > ScreenHeight)
          PSOrientation = VERTICAL_ORIENT;
      else
          PSOrientation = HORIZONTAL_ORIENT;

    Aspect = ((double) ScreenHeight) / ((double) ScreenWidth);

    if (!SizeFlag)
      switch (PSOrientation) {
            case HORIZONTAL_ORIENT:
              if (Aspect > PAGE_HEIGHT / PAGE_WIDTH) {
                PSSizeX = PAGE_HEIGHT / Aspect; 
                PSSizeY = PAGE_HEIGHT;
            }
            else {
                PSSizeX = PAGE_WIDTH;
                PSSizeY = PAGE_WIDTH * Aspect;
            }
            break;
          case VERTICAL_ORIENT:
              if (1 / Aspect > PAGE_HEIGHT / PAGE_WIDTH) {
                PSSizeX = PAGE_HEIGHT * Aspect; 
                PSSizeY = PAGE_HEIGHT;
            }
            else {
                PSSizeX = PAGE_WIDTH;
                PSSizeY = PAGE_WIDTH / Aspect;
            }
            break;
      }
    else {
      if (PAGE_WIDTH < PSSizeX) {
          GIF_MESSAGE("X Size specified is too big, page size selected.");
          PSSizeX = PAGE_WIDTH;
      }
      if (PAGE_HEIGHT < PSSizeY) {
          GIF_MESSAGE("Y Size specified is too big, page size selected.");
          PSSizeX = PAGE_HEIGHT;
      }
    }

    if (!PosFlag) {
      PSPosX = (FULL_PAGE_WIDTH - PSSizeX) / 2;
      PSPosY = (FULL_PAGE_HEIGHT - PSSizeY) / 2;
    }
    else {
      if (PSPosX + PSSizeX > PAGE_WIDTH || PSPosY + PSSizeY > PAGE_HEIGHT)
          GIF_EXIT("Requested position will put image out of page, aborted.");
    }

    /* Time to dump out the PostScript header: */
    printf("%%!\n");
    printf("%%%%Creator: %s\n", PROGRAM_NAME);
    printf("/#copies %d def\n", NumOfCopies);
    printf("gsave\n");
    printf("72 72 scale\t\t\t\t%% Lets talk inches.\n");
    printf("/oneline %d string def\t\t\t%% Allocate one scan line.\n",
         ScreenWidth);
    printf("/drawimage {\n");
    printf("\t%d %d 8 [%d 0 0 %d 0 %d]\n", ScreenWidth, ScreenHeight,
         ScreenWidth, -ScreenHeight, ScreenHeight);
    printf("\t{ currentfile oneline readhexstring pop } image\n");
    printf("} def\n");
    switch (PSOrientation) {
        case HORIZONTAL_ORIENT:
          printf("%lf %lf translate\n", PSPosX, PSPosY);
          printf("%lf %lf scale\n", PSSizeX, PSSizeY);
          break;
      case VERTICAL_ORIENT:
          printf("%lf %lf translate\n", PSPosX + PSSizeX, PSPosY);
          printf("90 rotate\n");
          printf("%lf %lf scale\n", PSSizeY, PSSizeX);
          break;
    }
    printf("drawimage\n");

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

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

      Line = ScreenBuffer[i];
      for (j = 0; j < ScreenWidth; j++) {
          ColorMapEntry = &ColorMap[Line[j]];
          Data = (30 * ((unsigned int) ColorMapEntry->Red) +
                59 * ((unsigned int) ColorMapEntry->Green) +
                11 * ((unsigned int) ColorMapEntry->Blue)) / 100;
          OutLine[j] = InvertFlag ? 255 - Data : Data;
      }

      PutString(OutLine, ScreenWidth);
    }
    free(OutLine);

    printf("\nshowpage\n");
    printf("grestore\n");
}

/******************************************************************************
* Dumps the string of given length as 2 hexdigits per byte 39 bytes per line. *
******************************************************************************/
static void PutString(unsigned char *Line, int Len)
{
    int i;
    static Counter = 0;
    static char *Hex = "0123456789ABCDEF";

    for (i = 0; i < Len; i++) {
      if (++Counter % 40 == 0) {
          putchar('\n');
          Counter = 1;
      }
      putchar(Hex[Line[i] >> 4]);
      putchar(Hex[Line[i] & 0x0f]);
    }
}

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