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306
G/UTIL/GIFRSIZE.C
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306
G/UTIL/GIFRSIZE.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 resize GIF by given factors horizontally and vertically. *
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* Options: *
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* -q : quite printing mode. *
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* -S x y : scale into size as specified by x and y. *
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* -s r : resize both x & y direction by factor r. *
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* -x r : resize the x direction (horizontally) by factor r. *
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* -y r : resize the y direction (vertically) by factor r. *
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* -h : on line help. *
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******************************************************************************
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* History: *
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* 4 Jul 89 - Version 1.0 by Gershon Elber. *
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* 22 Dec 89 - Fix minor bag in discarding last line of input (Version 1.1). *
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* 3 Aug 91 - make it scale by an arbitrary size value. *
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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 "GifRSize"
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#define MAX_SCALE 16.0 /* Maximum scaling factor. */
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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 = "GifRSize q%- S%-X|Y!d!d s%-Scale!F x%-XScale!F y%-YScale!F 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%- S%-X|Y!d!d s%-Scale!F x%-XScale!F y%-YScale!F h%- GifFile!*s";
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#endif /* SYSV */
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/* Make some variables global, so we could access them faster: */
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static GifPixelType
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BackGroundColor = 0;
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static double
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XScale = 0.5,
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YScale = 0.5;
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static int
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XSize = 0,
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YSize = 0;
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static void ResizeLine(GifRowType LineIn, GifRowType LineOut,
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int InLineLen, int OutLineLen);
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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, iy, last_iy, l, t, w, h, Error, NumFiles, ExtCode,
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ImageNum = 0,
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SizeFlag = FALSE,
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ScaleFlag = FALSE,
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XScaleFlag = FALSE,
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YScaleFlag = FALSE,
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HelpFlag = FALSE;
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double Scale, y;
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GifRecordType RecordType;
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char s[80];
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GifByteType *Extension;
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GifRowType LineIn, LineOut;
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char **FileName = NULL;
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GifFileType *GifFileIn = NULL, *GifFileOut = NULL;
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if ((Error = GAGetArgs(argc, argv, CtrlStr,
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&GifQuitePrint, &SizeFlag, &XSize, &YSize, &ScaleFlag, &Scale,
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&XScaleFlag, &XScale, &YScaleFlag, &YScale,
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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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/* If specific direction was set, set other direction to 1: */
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if (!XScaleFlag && YScaleFlag) XScale = 1.0;
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if (!YScaleFlag && XScaleFlag) YScale = 1.0;
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/* If the specific direction was not set, but global one did use it: */
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if (!XScaleFlag && ScaleFlag) XScale = Scale;
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if (!YScaleFlag && ScaleFlag) YScale = Scale;
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if (XScale > MAX_SCALE) {
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sprintf(s, "XScale too big, maximum scale selected instead (%d).",
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MAX_SCALE);
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GIF_MESSAGE(s);
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XScale = MAX_SCALE;
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}
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if (YScale > MAX_SCALE) {
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sprintf(s, "YScale too big, maximum scale selected instead (%d).",
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MAX_SCALE);
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GIF_MESSAGE(s);
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YScale = MAX_SCALE;
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}
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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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BackGroundColor = GifFileIn -> SBackGroundColor;
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/* If size was specified, it is used to derive the scale: */
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if (SizeFlag) {
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XScale = XSize / ((double) GifFileIn -> SWidth);
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YScale = YSize / ((double) GifFileIn -> SHeight);
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}
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else
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{
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XSize = (int) (GifFileIn -> SWidth * XScale + 0.5);
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YSize = (int) (GifFileIn -> SHeight * YScale + 0.5);
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}
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/* As at this time we know the Screen size of the input gif file, and as */
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/* all image(s) in file must be less/equal to it, we can allocate the */
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/* scan lines for the input file, and output file. The number of lines */
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/* to allocate for each is set by ScaleDown & XScale & YScale: */
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LineOut = (GifRowType) malloc(XSize * sizeof(GifPixelType));
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LineIn = (GifRowType) malloc(GifFileIn -> SWidth * sizeof(GifPixelType));
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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 its new scaled screen information: */
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if (EGifPutScreenDesc(GifFileOut, XSize, YSize,
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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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/* Put the image descriptor to out file: */
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l = (int) (GifFileIn -> ILeft * XScale + 0.5);
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w = (int) (GifFileIn -> IWidth * XScale + 0.5);
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t = (int) (GifFileIn -> ITop * YScale + 0.5);
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h = (int) (GifFileIn -> IHeight * YScale + 0.5);
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if (l < 0) l = 0;
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if (t < 0) t = 0;
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if (l + w > XSize) w = XSize - l;
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if (t + h > YSize) h = YSize - t;
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if (EGifPutImageDesc(GifFileOut, l, t, w, h,
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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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if (GifFileIn -> IInterlace) {
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GIF_EXIT("Cannt resize interlaced images - use GifInter first.");
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}
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else {
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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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GifFileOut -> ILeft, GifFileOut -> ITop,
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GifFileOut -> IWidth, GifFileOut -> IHeight);
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for (i = GifFileIn -> IHeight, y = 0.0, last_iy = -1;
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i-- > 0;
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y += YScale) {
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if (DGifGetLine(GifFileIn, LineIn,
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GifFileIn -> IWidth) == GIF_ERROR)
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QuitGifError(GifFileIn, GifFileOut);
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iy = (int) y;
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if (last_iy < iy && last_iy < YSize) {
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ResizeLine(LineIn, LineOut,
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GifFileIn -> IWidth, GifFileOut -> IWidth);
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for (;
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last_iy < iy && last_iy < GifFileOut -> IHeight - 1;
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last_iy++) {
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GifQprintf("\b\b\b\b%-4d", last_iy + 1);
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if (EGifPutLine(GifFileOut, LineOut,
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GifFileOut -> IWidth) ==
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GIF_ERROR)
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QuitGifError(GifFileIn, GifFileOut);
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}
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}
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}
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/* If scale is not dividable - dump last lines: */
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while (++last_iy < GifFileOut -> IHeight) {
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GifQprintf("\b\b\b\b%-4d", last_iy);
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if (EGifPutLine(GifFileOut, LineOut,
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GifFileOut -> IWidth) == GIF_ERROR)
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QuitGifError(GifFileIn, GifFileOut);
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}
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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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free(LineOut);
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free(LineIn);
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}
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/******************************************************************************
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* Line resizing routine - scale given lines as follows: *
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* Scale (by pixel duplication/elimination) from InLineLen to OutLineLen. *
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******************************************************************************/
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static void ResizeLine(GifRowType LineIn, GifRowType LineOut,
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int InLineLen, int OutLineLen)
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{
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int i, ix, last_ix;
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double x;
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OutLineLen--;
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for (i = InLineLen, x = 0.0, last_ix = -1;
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i-- > 0;
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x += XScale, LineIn++)
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{
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ix = (int) x;
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for (; last_ix < ix && last_ix < OutLineLen; last_ix++)
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*LineOut++ = *LineIn;
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}
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/* Make sure the line is complete. */
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for (LineIn--; last_ix < OutLineLen; last_ix++)
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*LineOut++ = *LineIn;
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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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