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G/UTIL/GIFCLIP.C
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256
G/UTIL/GIFCLIP.C
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/*****************************************************************************
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* "Gif-Lib" - Yet another gif library. *
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* *
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* Written by: Gershon Elber Ver 0.1, Jul. 1989 *
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******************************************************************************
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* Program to clip an image and dump out only portion of it. *
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* Options: *
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* -q : quite printing mode. *
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* -i left top width bottom : clipping information for first image. *
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* -n n left top width bottom : clipping information for nth image. *
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* -h : on line help *
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******************************************************************************
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* History: *
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* 8 Jul 89 - Version 1.0 by Gershon Elber. *
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*****************************************************************************/
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#ifdef __MSDOS__
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#include <stdlib.h>
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#include <alloc.h>
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#endif /* __MSDOS__ */
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#include <stdio.h>
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#include <ctype.h>
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#include <string.h>
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#include "gif_lib.h"
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#include "getarg.h"
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#define PROGRAM_NAME "GifClip"
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#ifdef __MSDOS__
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extern unsigned int
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_stklen = 16384; /* Increase default stack size. */
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#endif /* __MSDOS__ */
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#ifdef SYSV
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static char *VersionStr =
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"Gif library module,\t\tGershon Elber\n\
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(C) Copyright 1989 Gershon Elber, Non commercial use only.\n";
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static char
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*CtrlStr = "GifClip q%- i%-Xmin|Ymin|Xmax|Ymax!d!d!d!d n%-n|Xmin|Ymin|Xmax|Ymax!d!d!d!d!d h%- GifFile!*s";
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#else
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static char
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*VersionStr =
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PROGRAM_NAME
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GIF_LIB_VERSION
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" Gershon Elber, "
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__DATE__ ", " __TIME__ "\n"
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"(C) Copyright 1989 Gershon Elber, Non commercial use only.\n";
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static char
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*CtrlStr =
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PROGRAM_NAME
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" q%- i%-Xmin|Ymin|Xmax|Ymax!d!d!d!d n%-n|Xmin|Ymin|Xmax|Ymax!d!d!d!d!d h%- GifFile!*s";
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#endif /* SYSV */
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static void QuitGifError(GifFileType *GifFileIn, GifFileType *GifFileOut);
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/******************************************************************************
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* Interpret the command line and scan the given GIF file. *
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******************************************************************************/
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void main(int argc, char **argv)
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{
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int i, Error, NumFiles, ExtCode, CodeSize, ImageNum = 0,
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ImageFlag = FALSE, ImageNFlag = FALSE, ImageN, ImageX1, ImageY1,
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ImageX2, ImageY2, ImageWidth, HelpFlag = FALSE;
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GifRecordType RecordType;
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GifByteType *Extension, *CodeBlock;
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char **FileName = NULL;
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GifRowType Line;
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GifFileType *GifFileIn = NULL, *GifFileOut = NULL;
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/* Same image dimension vars for both Image & ImageN as only one allowed.*/
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if ((Error = GAGetArgs(argc, argv, CtrlStr, &GifQuitePrint,
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&ImageFlag, &ImageX1, &ImageY1, &ImageX2, &ImageY2,
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&ImageNFlag, &ImageN, &ImageX1, &ImageY1, &ImageX2, &ImageY2,
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&HelpFlag, &NumFiles, &FileName)) != FALSE ||
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(NumFiles > 1 && !HelpFlag)) {
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if (Error)
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GAPrintErrMsg(Error);
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else if (NumFiles > 1)
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GIF_MESSAGE("Error in command line parsing - one GIF file please.");
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GAPrintHowTo(CtrlStr);
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exit(1);
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}
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if (HelpFlag) {
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fprintf(stderr, VersionStr);
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GAPrintHowTo(CtrlStr);
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exit(0);
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}
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/* Test to make sure exactly one of ImageFlag & ImageNFlag is set: */
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if ((ImageFlag && ImageNFlag) || (!ImageFlag && !ImageNFlag)) {
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GIF_MESSAGE("Exactly one of [-i ...] && [-n ...] please.");
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GAPrintHowTo(CtrlStr);
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exit(1);
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}
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if (ImageFlag) ImageN = 1; /* Its first image we are after. */
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/* Make sure the first coordinates of clipping box are smaller: */
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if (ImageX1 > ImageX2) {
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i = ImageX1;
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ImageX1 = ImageX2;
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ImageX2 = i;
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}
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if (ImageY1 > ImageY2) {
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i = ImageX1;
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ImageY1 = ImageY2;
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ImageY2 = i;
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}
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ImageWidth = ImageX2 - ImageX1 + 1; /* Width of clipped image. */
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if (NumFiles == 1) {
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if ((GifFileIn = DGifOpenFileName(*FileName)) == NULL)
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QuitGifError(GifFileIn, GifFileOut);
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}
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else {
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/* Use the stdin instead: */
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if ((GifFileIn = DGifOpenFileHandle(0)) == NULL)
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QuitGifError(GifFileIn, GifFileOut);
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}
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/* Open stdout for the output file: */
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if ((GifFileOut = EGifOpenFileHandle(1)) == NULL)
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QuitGifError(GifFileIn, GifFileOut);
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/* And dump out exactly same screen information: */
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if (EGifPutScreenDesc(GifFileOut,
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GifFileIn -> SWidth, GifFileIn -> SHeight,
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GifFileIn -> SColorResolution, GifFileIn -> SBackGroundColor,
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GifFileIn -> SBitsPerPixel, GifFileIn -> SColorMap) == GIF_ERROR)
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QuitGifError(GifFileIn, GifFileOut);
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/* Scan the content of the GIF file and load the image(s) in: */
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do {
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if (DGifGetRecordType(GifFileIn, &RecordType) == GIF_ERROR)
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QuitGifError(GifFileIn, GifFileOut);
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switch (RecordType) {
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case IMAGE_DESC_RECORD_TYPE:
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if (DGifGetImageDesc(GifFileIn) == GIF_ERROR)
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QuitGifError(GifFileIn, GifFileOut);
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if (++ImageNum == ImageN) {
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/* We can handle only non interlaced images here: */
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if (GifFileIn -> IInterlace)
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GIF_EXIT("Image to clip is interlaced - use GifInter first.");
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/* This is the image we should clip - test sizes and */
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/* dump out new clipped screen descriptor if o.k. */
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if (GifFileIn -> IWidth <= ImageX2 ||
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GifFileIn -> IHeight <= ImageY2)
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GIF_EXIT("Image is smaller than given clip dimensions.");
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/* Put the image descriptor to out file: */
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if (EGifPutImageDesc(GifFileOut,
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GifFileIn -> ILeft, GifFileIn -> ITop,
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ImageWidth, ImageY2 - ImageY1 + 1,
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FALSE, GifFileIn -> IBitsPerPixel,
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GifFileIn -> IColorMap) == GIF_ERROR)
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QuitGifError(GifFileIn, GifFileOut);
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/* o.k. - read the image and clip it: */
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Line = (GifRowType) malloc(GifFileIn -> IWidth *
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sizeof(GifPixelType));
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GifQprintf("\n%s: Image %d at (%d, %d) [%dx%d]: ",
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PROGRAM_NAME, ImageNum,
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GifFileIn -> ILeft, GifFileIn -> ITop,
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GifFileIn -> IWidth, GifFileIn -> IHeight);
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/* Skip lines below ImageY1: */
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for (i = 0; i < ImageY1; i++) {
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if (DGifGetLine(GifFileIn, Line, GifFileIn -> IWidth)
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== GIF_ERROR)
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QuitGifError(GifFileIn, GifFileOut);
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GifQprintf("\b\b\b\b%-4d", i);
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}
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/* Clip the lines from ImageY1 to ImageY2 (to X1 - X2): */
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for (i = ImageY1; i <= ImageY2; i++) {
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if (DGifGetLine(GifFileIn, Line, GifFileIn -> IWidth)
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== GIF_ERROR)
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QuitGifError(GifFileIn, GifFileOut);
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if (EGifPutLine(GifFileOut, &Line[ImageX1],
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ImageWidth) == GIF_ERROR)
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QuitGifError(GifFileIn, GifFileOut);
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GifQprintf("\b\b\b\b%-4d", i);
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}
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/* Skip lines above ImageY2: */
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for (i = ImageY2 + 1; i < GifFileIn -> IHeight; i++) {
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if (DGifGetLine(GifFileIn, Line, GifFileIn -> IWidth)
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== GIF_ERROR)
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QuitGifError(GifFileIn, GifFileOut);
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GifQprintf("\b\b\b\b%-4d", i);
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}
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free((char *) Line);
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}
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else {
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/* Copy the image as is (we dont modify this one): */
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if (EGifPutImageDesc(GifFileOut,
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GifFileIn -> ILeft, GifFileIn -> ITop,
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GifFileIn -> IWidth, GifFileIn -> IHeight,
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GifFileIn -> IInterlace, GifFileIn -> IBitsPerPixel,
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GifFileIn -> IColorMap) == GIF_ERROR)
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QuitGifError(GifFileIn, GifFileOut);
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/* Now read image itself in decoded form as we dont */
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/* really care what is there, and this is much faster. */
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if (DGifGetCode(GifFileIn, &CodeSize, &CodeBlock) == GIF_ERROR
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|| EGifPutCode(GifFileOut, CodeSize, CodeBlock) == GIF_ERROR)
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QuitGifError(GifFileIn, GifFileOut);
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while (CodeBlock != NULL)
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if (DGifGetCodeNext(GifFileIn, &CodeBlock) == GIF_ERROR ||
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EGifPutCodeNext(GifFileOut, CodeBlock) == GIF_ERROR)
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QuitGifError(GifFileIn, GifFileOut);
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}
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break;
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case EXTENSION_RECORD_TYPE:
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/* Skip any extension blocks in file: */
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if (DGifGetExtension(GifFileIn, &ExtCode, &Extension) == GIF_ERROR)
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QuitGifError(GifFileIn, GifFileOut);
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if (EGifPutExtension(GifFileOut, ExtCode, Extension[0],
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Extension) == GIF_ERROR)
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QuitGifError(GifFileIn, GifFileOut);
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/* No support to more than one extension blocks, so discard: */
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while (Extension != NULL) {
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if (DGifGetExtensionNext(GifFileIn, &Extension) == GIF_ERROR)
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QuitGifError(GifFileIn, GifFileOut);
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}
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break;
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case TERMINATE_RECORD_TYPE:
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break;
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default: /* Should be traps by DGifGetRecordType. */
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break;
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}
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}
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while (RecordType != TERMINATE_RECORD_TYPE);
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if (DGifCloseFile(GifFileIn) == GIF_ERROR)
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QuitGifError(GifFileIn, GifFileOut);
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if (EGifCloseFile(GifFileOut) == GIF_ERROR)
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QuitGifError(GifFileIn, GifFileOut);
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}
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/******************************************************************************
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* Close both input and output file (if open), and exit. *
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******************************************************************************/
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static void QuitGifError(GifFileType *GifFileIn, GifFileType *GifFileOut)
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{
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PrintGifError();
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if (GifFileIn != NULL) DGifCloseFile(GifFileIn);
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if (GifFileOut != NULL) EGifCloseFile(GifFileOut);
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exit(1);
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}
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