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gifclip.c

/*****************************************************************************
*   "Gif-Lib" - Yet another gif library.                         *
*                                                          *
* Written by:  Gershon Elber                    Ver 0.1, Jul. 1989   *
******************************************************************************
* Program to clip an image and dump out only portion of it.            *
* Options:                                                 *
* -q : quiet printing mode.                                      *
* -i left top width bottom : clipping information for first image.           *
* -n n left top width bottom : clipping information for nth image.           *
* -c complement; remove the bands specified by -i or -n                      *
* -h : on-line help                                              *
******************************************************************************
* History:                                                 *
* 8 Jul 89 - Version 1.0 by Gershon Elber.                             *
*****************************************************************************/

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#ifdef __MSDOS__
#include <stdlib.h>
#include <alloc.h>
#endif /* __MSDOS__ */

#ifndef __MSDOS__
#include <stdlib.h>
#endif
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include "gif_lib.h"
#include "getarg.h"

#define PROGRAM_NAME    "GifClip"

#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 = "GifClip q%- c%- i%-Xmin|Ymin|Xmax|Ymax!d!d!d!d n%-n|Xmin|Ymin|Xmax|Ymax!d!d!d!d!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%- c%- i%-Xmin|Ymin|Xmax|Ymax!d!d!d!d n%-n|Xmin|Ymin|Xmax|Ymax!d!d!d!d!d h%- GifFile!*s";
#endif /* SYSV */

static void QuitGifError(GifFileType *GifFileIn, GifFileType *GifFileOut);

/******************************************************************************
* Interpret the command line and scan the given GIF file.               *
******************************************************************************/
int main(int argc, char **argv)
{
    int     i, Error, NumFiles, ExtCode, CodeSize, ImageNum = 0,
      ImageFlag = FALSE, ImageNFlag = FALSE, ImageN, ImageX1, ImageY1,
      ImageX2, ImageY2, ImageWidth, ImageDepth,
      Complement = FALSE, HelpFlag = FALSE;
    GifRecordType RecordType;
    GifByteType *Extension, *CodeBlock;
    char **FileName = NULL;
    GifRowType Line;
    GifFileType *GifFileIn = NULL, *GifFileOut = NULL;

    /* Same image dimension vars for both Image & ImageN as only one allowed.*/
    if ((Error = GAGetArgs(argc, argv, CtrlStr, &GifQuietPrint, &Complement,
            &ImageFlag, &ImageX1, &ImageY1, &ImageX2, &ImageY2,
            &ImageNFlag, &ImageN, &ImageX1, &ImageY1, &ImageX2, &ImageY2,
            &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(EXIT_FAILURE);
    }

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

    /* Test to make sure exactly one of ImageFlag & ImageNFlag is set: */
    if ((ImageFlag && ImageNFlag) || (!ImageFlag && !ImageNFlag)) {
      GIF_MESSAGE("Exactly one of [-i ...] && [-n ...] please.");
      GAPrintHowTo(CtrlStr);
      exit(EXIT_FAILURE);
    }
    if (ImageFlag) ImageN = 1;                /* Its first image we are after. */

    /* Make sure the first coordinates of clipping box are smaller: */
    if (ImageX1 > ImageX2) {
      i = ImageX1;
      ImageX1 = ImageX2;
      ImageX2 = i;
    }
    if (ImageY1 > ImageY2) {
      i = ImageX1;
      ImageY1 = ImageY2;
      ImageY2 = i;
    }

    if (NumFiles == 1) {
      if ((GifFileIn = DGifOpenFileName(*FileName)) == NULL)
          QuitGifError(GifFileIn, GifFileOut);
    }
    else {
      /* Use the stdin instead: */
      if ((GifFileIn = DGifOpenFileHandle(0)) == NULL)
          QuitGifError(GifFileIn, GifFileOut);
    }

    /* Open stdout for the output file: */
    if ((GifFileOut = EGifOpenFileHandle(1)) == NULL)
      QuitGifError(GifFileIn, GifFileOut);

    /* Width and depth of clipped image. */
    if (!Complement)
      ImageWidth = ImageX2 - ImageX1 + 1;
    else
      ImageWidth = GifFileIn->SWidth
          - (ImageX2 != ImageX1) * (ImageX2 - ImageX1 + 1);
    if (!Complement)
      ImageDepth = ImageY2 - ImageY1 + 1;
    else
      ImageDepth = GifFileIn->SHeight
          - (ImageY2 != ImageY1) * (ImageY2 - ImageY1 + 1);

    /* And dump out exactly same screen information: */
    if (EGifPutScreenDesc(GifFileOut,
      GifFileIn->SWidth, GifFileIn->SHeight,
      GifFileIn->SColorResolution, GifFileIn->SBackGroundColor,
      GifFileIn->SColorMap) == GIF_ERROR)
      QuitGifError(GifFileIn, GifFileOut);

    /* Scan the content of the GIF file and load the image(s) in: */
    do {
      if (DGifGetRecordType(GifFileIn, &RecordType) == GIF_ERROR)
          QuitGifError(GifFileIn, GifFileOut);

      switch (RecordType) {
          case IMAGE_DESC_RECORD_TYPE:
            if (DGifGetImageDesc(GifFileIn) == GIF_ERROR)
                QuitGifError(GifFileIn, GifFileOut);
            if (++ImageNum == ImageN) {
                /* We can handle only non interlaced images here: */
                if (GifFileIn->Image.Interlace)
                  GIF_EXIT("Image to clip is interlaced - use GifInter first.");

                /* This is the image we should clip - test sizes and     */
                /* dump out new clipped screen descriptor if o.k.      */
                if (GifFileIn->Image.Width <= ImageX2 ||
                  GifFileIn->Image.Height <= ImageY2)
                  GIF_EXIT("Image is smaller than given clip dimensions.");

                /* Put the image descriptor to out file: */
                if (EGifPutImageDesc(GifFileOut,
                  GifFileIn->Image.Left, GifFileIn->Image.Top,
                  ImageWidth, ImageDepth,
                  FALSE, GifFileIn->Image.ColorMap) == GIF_ERROR)
                  QuitGifError(GifFileIn, GifFileOut);

                /* o.k. - read the image and clip it: */
                Line = (GifRowType) malloc(GifFileIn->Image.Width *
                                          sizeof(GifPixelType));
                GifQprintf("\n%s: Image %d at (%d, %d) [%dx%d]:     ",
                  PROGRAM_NAME, ImageNum,
                  GifFileIn->Image.Left, GifFileIn->Image.Top,
                  GifFileIn->Image.Width, GifFileIn->Image.Height);

                /* Skip lines below ImageY1: */
                for (i = 0; i < ImageY1; i++) {
                  if (DGifGetLine(GifFileIn, Line, GifFileIn->Image.Width)
                      == GIF_ERROR)
                      QuitGifError(GifFileIn, GifFileOut);

                  if (Complement) {
                      if (ImageX1 == ImageX2) {
                        /* don't remove any vertical band */
                        if (EGifPutLine(GifFileOut, Line,
                                    ImageWidth) == GIF_ERROR)
                            QuitGifError(GifFileIn, GifFileOut);
                      }
                      else
                      {
                        if (EGifPutLine(GifFileOut, Line,
                                    ImageX1) == GIF_ERROR)
                            QuitGifError(GifFileIn, GifFileOut);

                        if (EGifPutLine(GifFileOut,
                                    &Line[ImageX2 + 1],
                                    GifFileIn->SWidth - (ImageX2 + 1)
                                    ) == GIF_ERROR)
                            QuitGifError(GifFileIn, GifFileOut);
                      }
                  }

                  GifQprintf("\b\b\b\b%-4d", i);
                }

                /* Clip the lines from ImageY1 to ImageY2 (to X1 - X2): */
                for (i = ImageY1; i <= ImageY2; i++) {
                  if (DGifGetLine(GifFileIn, Line, GifFileIn->Image.Width)
                      == GIF_ERROR)
                      QuitGifError(GifFileIn, GifFileOut);

                  if (!Complement)
                      if (EGifPutLine(GifFileOut, &Line[ImageX1],
                                  ImageWidth) == GIF_ERROR)
                        QuitGifError(GifFileIn, GifFileOut);

                  GifQprintf("\b\b\b\b%-4d", i);
                }

                /* Skip lines above ImageY2: */
                for (i = ImageY2 + 1; i < GifFileIn->Image.Height; i++) {
                  if (DGifGetLine(GifFileIn, Line, GifFileIn->Image.Width)
                      == GIF_ERROR)
                      QuitGifError(GifFileIn, GifFileOut);

                  if (Complement) {
                      if (ImageX1 == ImageX2) {
                        /* don't remove any vertical band */
                        if (EGifPutLine(GifFileOut, Line,
                                    ImageWidth) == GIF_ERROR)
                            QuitGifError(GifFileIn, GifFileOut);
                      }
                      else
                      {
                        if (EGifPutLine(GifFileOut, Line,
                                    ImageX1) == GIF_ERROR)
                            QuitGifError(GifFileIn, GifFileOut);

                        if (EGifPutLine(GifFileOut,
                                    &Line[ImageX2 + 1],
                                    GifFileIn->SWidth - (ImageX2 + 1)
                                    ) == GIF_ERROR)
                            QuitGifError(GifFileIn, GifFileOut);
                      }
                  }

                  GifQprintf("\b\b\b\b%-4d", i);
                }

                free((char *) Line);
            }
            else {
                /* Copy the image as is (we dont modify this one): */
                if (EGifPutImageDesc(GifFileOut,
                  GifFileIn->Image.Left, GifFileIn->Image.Top,
                  GifFileIn->Image.Width, GifFileIn->Image.Height,
                  GifFileIn->Image.Interlace,
                  GifFileIn->Image.ColorMap) == GIF_ERROR)
                  QuitGifError(GifFileIn, GifFileOut);

                /* Now read image itself in decoded form as we dont      */
                /* really care what is there, and this is much faster.   */
                if (DGifGetCode(GifFileIn, &CodeSize, &CodeBlock) == GIF_ERROR
                 || EGifPutCode(GifFileOut, CodeSize, CodeBlock) == GIF_ERROR)
                  QuitGifError(GifFileIn, GifFileOut);
                while (CodeBlock != NULL)
                  if (DGifGetCodeNext(GifFileIn, &CodeBlock) == GIF_ERROR ||
                      EGifPutCodeNext(GifFileOut, CodeBlock) == GIF_ERROR)
                      QuitGifError(GifFileIn, GifFileOut);
            }
            break;
          case EXTENSION_RECORD_TYPE:
            /* Skip any extension blocks in file: */
            if (DGifGetExtension(GifFileIn, &ExtCode, &Extension) == GIF_ERROR)
                QuitGifError(GifFileIn, GifFileOut);
            if (EGifPutExtension(GifFileOut, ExtCode, Extension[0],
                                          Extension) == GIF_ERROR)
                QuitGifError(GifFileIn, GifFileOut);

            /* No support to more than one extension blocks, so discard: */
            while (Extension != NULL) {
                if (DGifGetExtensionNext(GifFileIn, &Extension) == GIF_ERROR)
                  QuitGifError(GifFileIn, GifFileOut);
            }
            break;
          case TERMINATE_RECORD_TYPE:
            break;
          default:                /* Should be traps by DGifGetRecordType. */
            break;
      }
    }
    while (RecordType != TERMINATE_RECORD_TYPE);

    if (DGifCloseFile(GifFileIn) == GIF_ERROR)
      QuitGifError(GifFileIn, GifFileOut);
    if (EGifCloseFile(GifFileOut) == GIF_ERROR)
      QuitGifError(GifFileIn, GifFileOut);

    return 0;
}

/******************************************************************************
* Close both input and output file (if open), and exit.                       *
******************************************************************************/
static void QuitGifError(GifFileType *GifFileIn, GifFileType *GifFileOut)
{
    PrintGifError();
    if (GifFileIn != NULL) DGifCloseFile(GifFileIn);
    if (GifFileOut != NULL) EGifCloseFile(GifFileOut);
    exit(EXIT_FAILURE);
}


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