Logo Search packages:      
Sourcecode: giflib version File versions

gifpos.c

/*****************************************************************************
*   "Gif-Lib" - Yet another gif library.                         *
*                                                          *
* Written by:  Gershon Elber                    Ver 0.1, Jul. 1989   *
******************************************************************************
* Program to reposition GIF file, by changing screen size and/or image(s)    *
* position. Neither image(s) not colormap(s) are changed by any mean.        *
* Options:                                                 *
* -q : quiet printing mode.                                      *
* -s w h : set new screen size - width & height.                       *
* -i t l : set new image position - top & left (for first image).      *
* -n n w h : set new image position - top & left (for image number n).       *
* -h : on-line help.                                             *
******************************************************************************
* History:                                                 *
* 6 Jul 89 - Version 1.0 by Gershon Elber.                             *
*****************************************************************************/

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

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

#define PROGRAM_NAME    "GifPos"

#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 = "GifPos q%- s%-Width|Height!d!d i%-Left|Top!d!d n%-n|Left|Top!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%- s%-Width|Height!d!d i%-Left|Top!d!d n%-n|Left|Top!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.               *
******************************************************************************/
void main(int argc, char **argv)
{
    int     Error, NumFiles, ExtCode, CodeSize, ImageNum = 0,
      ScreenFlag = FALSE, ScreenWidth, ScreenHeight,
      ImageFlag = FALSE, ImageLeft, ImageTop,
      ImageNFlag = FALSE, ImageN, ImageNLeft, ImageNTop,
      HelpFlag = FALSE;
    GifRecordType RecordType;
    GifByteType *Extension, *CodeBlock;
    char **FileName = NULL;
    GifFileType *GifFileIn = NULL, *GifFileOut = NULL;

    if ((Error = GAGetArgs(argc, argv, CtrlStr, &GifQuietPrint,
            &ScreenFlag, &ScreenWidth, &ScreenHeight,
            &ImageFlag, &ImageLeft, &ImageTop,
            &ImageNFlag, &ImageN, &ImageNLeft, &ImageNTop,
            &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 (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);

    /* And dump out its new possible repositioned screen information: */
    if (EGifPutScreenDesc(GifFileOut,
      ScreenFlag ? ScreenWidth : GifFileIn->SWidth,
      ScreenFlag ? ScreenHeight : 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);
            /* Put possibly repositioned image descriptor to out file: */
            if (++ImageNum == 1 && ImageFlag) {
                /* First image should be repositioned: */
                if (EGifPutImageDesc(GifFileOut,
                  ImageLeft, ImageTop,
                  GifFileIn->Image.Width, GifFileIn->Image.Height,
                  GifFileIn->Image.Interlace,
                  GifFileIn->Image.ColorMap) == GIF_ERROR)
                  QuitGifError(GifFileIn, GifFileOut);
            }
            else if (ImageNum == ImageN && ImageNFlag) {
                /* Image N should be repositioned: */
                if (EGifPutImageDesc(GifFileOut,
                  ImageNLeft, ImageNTop,
                  GifFileIn->Image.Width, GifFileIn->Image.Height,
                  GifFileIn->Image.Interlace,
                  GifFileIn->Image.ColorMap) == GIF_ERROR)
                  QuitGifError(GifFileIn, GifFileOut);
            }
            else {
                /* No repositioning for this image: */
                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 we have 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:
            /* Copy the extension header */
            if (DGifGetExtension(GifFileIn, &ExtCode, &Extension) == GIF_ERROR)
                QuitGifError(GifFileIn, GifFileOut);
            if (EGifPutExtensionHeader(GifFileOut, ExtCode) == GIF_ERROR)
                QuitGifError(GifFileIn, GifFileOut);

            /* Copy the extension data blocks */
            while (Extension != NULL) {
                if (EGifPutExtensionBlock(GifFileOut, Extension[0],
                  Extension+1) == GIF_ERROR)
                      QuitGifError(GifFileIn, GifFileOut);
                if (DGifGetExtensionNext(GifFileIn, &Extension) == GIF_ERROR)
                  QuitGifError(GifFileIn, GifFileOut);
            }
            /* Close the extension with a 0 length block */
            if (EGifPutExtensionBlock(GifFileOut, 0, NULL) == 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);
}

/******************************************************************************
* 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(1);
}

Generated by  Doxygen 1.6.0   Back to index