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GIFLIB12.ZIP
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UTIL
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GIFRSIZE.C
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1991-08-05
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/*****************************************************************************
* "Gif-Lib" - Yet another gif library. *
* *
* Written by: Gershon Elber Ver 0.1, Jul. 1989 *
******************************************************************************
* Program to resize GIF by given factors horizontally and vertically. *
* Options: *
* -q : quite printing mode. *
* -S x y : scale into size as specified by x and y. *
* -s r : resize both x & y direction by factor r. *
* -x r : resize the x direction (horizontally) by factor r. *
* -y r : resize the y direction (vertically) by factor r. *
* -h : on line help. *
******************************************************************************
* History: *
* 4 Jul 89 - Version 1.0 by Gershon Elber. *
* 22 Dec 89 - Fix minor bag in discarding last line of input (Version 1.1). *
* 3 Aug 91 - make it scale by an arbitrary size value. *
*****************************************************************************/
#ifdef __MSDOS__
#include <stdlib.h>
#include <alloc.h>
#endif /* __MSDOS__ */
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include "gif_lib.h"
#include "getarg.h"
#define PROGRAM_NAME "GifRSize"
#define MAX_SCALE 16.0 /* Maximum scaling factor. */
#ifdef __MSDOS__
extern unsigned int
_stklen = 16384; /* Increase default stack size. */
#endif /* __MSDOS__ */
#ifdef SYSV
static char *VersionStr =
"Gif library module,\t\tGershon Elber\n\
(C) Copyright 1989 Gershon Elber, Non commercial use only.\n";
static char
*CtrlStr = "GifRSize q%- S%-X|Y!d!d s%-Scale!F x%-XScale!F y%-YScale!F h%- GifFile!*s";
#else
static char
*VersionStr =
PROGRAM_NAME
GIF_LIB_VERSION
" Gershon Elber, "
__DATE__ ", " __TIME__ "\n"
"(C) Copyright 1989 Gershon Elber, Non commercial use only.\n";
static char
*CtrlStr =
PROGRAM_NAME
" q%- S%-X|Y!d!d s%-Scale!F x%-XScale!F y%-YScale!F h%- GifFile!*s";
#endif /* SYSV */
/* Make some variables global, so we could access them faster: */
static GifPixelType
BackGroundColor = 0;
static double
XScale = 0.5,
YScale = 0.5;
static int
XSize = 0,
YSize = 0;
static void ResizeLine(GifRowType LineIn, GifRowType LineOut,
int InLineLen, int OutLineLen);
static void QuitGifError(GifFileType *GifFileIn, GifFileType *GifFileOut);
/******************************************************************************
* Interpret the command line and scan the given GIF file. *
******************************************************************************/
void main(int argc, char **argv)
{
int i, iy, last_iy, l, t, w, h, Error, NumFiles, ExtCode,
ImageNum = 0,
SizeFlag = FALSE,
ScaleFlag = FALSE,
XScaleFlag = FALSE,
YScaleFlag = FALSE,
HelpFlag = FALSE;
double Scale, y;
GifRecordType RecordType;
char s[80];
GifByteType *Extension;
GifRowType LineIn, LineOut;
char **FileName = NULL;
GifFileType *GifFileIn = NULL, *GifFileOut = NULL;
if ((Error = GAGetArgs(argc, argv, CtrlStr,
&GifQuitePrint, &SizeFlag, &XSize, &YSize, &ScaleFlag, &Scale,
&XScaleFlag, &XScale, &YScaleFlag, &YScale,
&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 specific direction was set, set other direction to 1: */
if (!XScaleFlag && YScaleFlag) XScale = 1.0;
if (!YScaleFlag && XScaleFlag) YScale = 1.0;
/* If the specific direction was not set, but global one did use it: */
if (!XScaleFlag && ScaleFlag) XScale = Scale;
if (!YScaleFlag && ScaleFlag) YScale = Scale;
if (XScale > MAX_SCALE) {
sprintf(s, "XScale too big, maximum scale selected instead (%d).",
MAX_SCALE);
GIF_MESSAGE(s);
XScale = MAX_SCALE;
}
if (YScale > MAX_SCALE) {
sprintf(s, "YScale too big, maximum scale selected instead (%d).",
MAX_SCALE);
GIF_MESSAGE(s);
YScale = MAX_SCALE;
}
if (NumFiles == 1) {
if ((GifFileIn = DGifOpenFileName(*FileName)) == NULL)
QuitGifError(GifFileIn, GifFileOut);
}
else {
/* Use the stdin instead: */
if ((GifFileIn = DGifOpenFileHandle(0)) == NULL)
QuitGifError(GifFileIn, GifFileOut);
}
BackGroundColor = GifFileIn -> SBackGroundColor;
/* If size was specified, it is used to derive the scale: */
if (SizeFlag) {
XScale = XSize / ((double) GifFileIn -> SWidth);
YScale = YSize / ((double) GifFileIn -> SHeight);
}
else
{
XSize = (int) (GifFileIn -> SWidth * XScale + 0.5);
YSize = (int) (GifFileIn -> SHeight * YScale + 0.5);
}
/* As at this time we know the Screen size of the input gif file, and as */
/* all image(s) in file must be less/equal to it, we can allocate the */
/* scan lines for the input file, and output file. The number of lines */
/* to allocate for each is set by ScaleDown & XScale & YScale: */
LineOut = (GifRowType) malloc(XSize * sizeof(GifPixelType));
LineIn = (GifRowType) malloc(GifFileIn -> SWidth * sizeof(GifPixelType));
/* Open stdout for the output file: */
if ((GifFileOut = EGifOpenFileHandle(1)) == NULL)
QuitGifError(GifFileIn, GifFileOut);
/* And dump out its new scaled screen information: */
if (EGifPutScreenDesc(GifFileOut, XSize, YSize,
GifFileIn -> SColorResolution, GifFileIn -> SBackGroundColor,
GifFileIn -> SBitsPerPixel, 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 the image descriptor to out file: */
l = (int) (GifFileIn -> ILeft * XScale + 0.5);
w = (int) (GifFileIn -> IWidth * XScale + 0.5);
t = (int) (GifFileIn -> ITop * YScale + 0.5);
h = (int) (GifFileIn -> IHeight * YScale + 0.5);
if (l < 0) l = 0;
if (t < 0) t = 0;
if (l + w > XSize) w = XSize - l;
if (t + h > YSize) h = YSize - t;
if (EGifPutImageDesc(GifFileOut, l, t, w, h,
GifFileIn -> IInterlace, GifFileIn -> IBitsPerPixel,
GifFileIn -> IColorMap) == GIF_ERROR)
QuitGifError(GifFileIn, GifFileOut);
if (GifFileIn -> IInterlace) {
GIF_EXIT("Cannt resize interlaced images - use GifInter first.");
}
else {
GifQprintf("\n%s: Image %d at (%d, %d) [%dx%d]: ",
PROGRAM_NAME, ++ImageNum,
GifFileOut -> ILeft, GifFileOut -> ITop,
GifFileOut -> IWidth, GifFileOut -> IHeight);
for (i = GifFileIn -> IHeight, y = 0.0, last_iy = -1;
i-- > 0;
y += YScale) {
if (DGifGetLine(GifFileIn, LineIn,
GifFileIn -> IWidth) == GIF_ERROR)
QuitGifError(GifFileIn, GifFileOut);
iy = (int) y;
if (last_iy < iy && last_iy < YSize) {
ResizeLine(LineIn, LineOut,
GifFileIn -> IWidth, GifFileOut -> IWidth);
for (;
last_iy < iy && last_iy < GifFileOut -> IHeight - 1;
last_iy++) {
GifQprintf("\b\b\b\b%-4d", last_iy + 1);
if (EGifPutLine(GifFileOut, LineOut,
GifFileOut -> IWidth) ==
GIF_ERROR)
QuitGifError(GifFileIn, GifFileOut);
}
}
}
/* If scale is not dividable - dump last lines: */
while (++last_iy < GifFileOut -> IHeight) {
GifQprintf("\b\b\b\b%-4d", last_iy);
if (EGifPutLine(GifFileOut, LineOut,
GifFileOut -> IWidth) == 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);
free(LineOut);
free(LineIn);
}
/******************************************************************************
* Line resizing routine - scale given lines as follows: *
* Scale (by pixel duplication/elimination) from InLineLen to OutLineLen. *
******************************************************************************/
static void ResizeLine(GifRowType LineIn, GifRowType LineOut,
int InLineLen, int OutLineLen)
{
int i, ix, last_ix;
double x;
OutLineLen--;
for (i = InLineLen, x = 0.0, last_ix = -1;
i-- > 0;
x += XScale, LineIn++)
{
ix = (int) x;
for (; last_ix < ix && last_ix < OutLineLen; last_ix++)
*LineOut++ = *LineIn;
}
/* Make sure the line is complete. */
for (LineIn--; last_ix < OutLineLen; last_ix++)
*LineOut++ = *LineIn;
}
/******************************************************************************
* 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);
}