Category : C Source Code
Archive   : GIF_LIB.ZIP
Filename : GIFHISTO.C

/*****************************************************************************
* "Gif-Lib" - Yet another gif library. *
* *
* Written by: Gershon Elber IBM PC Ver 0.1, Jul. 1989 *
******************************************************************************
* Program to create histogram of the colors used by the given GIF file. *
* Dumps out GIF file of constants size GIF_WIDTH by GIF_HEIGHT. *
* Options: *
* -t : Dump out text instead of GIF - #Colors lines, each with #appearances. *
* -i W H : size of GIF image to generate. Colors of input GIF file are *
* spread homogeneously along Height, which better by dividable by the *
* number of colors in input image. *
* -n n : select image number to generate histogram to (1 by default). *
* -b : strip off background color count. *
* -h : on line help *
******************************************************************************
* History: *
* 8 Jul 89 - Version 1.0 by Gershon Elber. *
*****************************************************************************/

#include
#include
#include
#include
#include
#include "gif_lib.h"
#include "getarg.h"

#define PROGRAM_NAME "GifHisto"
#define VERSION "á Version 1.0, "

#define DEFAULT_HISTO_WIDTH 100 /* Histogram image diemnsions */
#define DEFAULT_HISTO_HEIGHT 256
#define HISTO_BITS_PER_PIXEL 2 /* Size of bitmap for histogram GIF */

extern unsigned int
_stklen = 16384; /* Increase default stack size */

static char
*VersionStr =
PROGRAM_NAME
" IBMPC "
VERSION
" Gershon Elber, "
__DATE__ ", " __TIME__ "\n"
"(C) Copyright 1989 Gershon Elber, Non commercial use only.\n";
static char
*CtrlStr =
PROGRAM_NAME
" t%- s%-Width|Height!d!d n%-ImageNumber!d b%- h%- GifFile!*s";
static char
*ProgramName;
static int
ImageWidth = DEFAULT_HISTO_WIDTH,
ImageHeight = DEFAULT_HISTO_HEIGHT,
ImageN = 1;
static GifColorType
HistoColorMap[] = { /* Constant bit map for histograms: */
{ 0, 0, 0 },
{ 255, 0, 0 },
{ 0, 255, 0 },
{ 0, 0, 255 }
};

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, j, Size, Error, NumFiles, ExtCode, CodeSize, NumColors, Color,
Count, ImageNum = 0, TextFlag = FALSE, SizeFlag = FALSE,
ImageNFlag = FALSE, BackGroundFlag = FALSE, HelpFlag = FALSE;
long Scaler, Histogram[256];
GifRecordType RecordType;
ByteType *Extension, *CodeBlock;
char **FileName = NULL;
RowType Line;
GifFileType *GifFileIn = NULL, *GifFileOut = NULL;

if (strlen(ProgramName = argv[0]) == 0) /* DOS 3.x only! */
ProgramName = PROGRAM_NAME; /* Do something reasonable for 2.x */

/* Same image dimension vars for both Image & ImageN as only one allowed */
if ((Error = GAGetArgs(argc, argv, CtrlStr,
&TextFlag, &SizeFlag, &ImageWidth, &ImageHeight,
&ImageNFlag, &ImageN, &BackGroundFlag,
&HelpFlag, &NumFiles, &FileName)) != FALSE ||
(NumFiles > 1 && !HelpFlag)) {
if (Error) GAPrintErrMsg(Error);
else
if (NumFiles > 1)
MESSAGE("Error in command line parsing - one GIF file please\n");
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);
}

for (i=0; i<256; i++) Histogram[i] = 0; /* Reset counters. */


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

switch (RecordType) {
case IMAGE_DESC_RECORD_TYPE:
if (DGifGetImageDesc(GifFileIn) == ERROR)
QuitGifError(GifFileIn, GifFileOut);

if (GifFileIn -> IColorMap)
NumColors = (1 << GifFileIn -> IBitsPerPixel);
else
if (GifFileIn -> SColorMap)
NumColors = (1 << GifFileIn -> SBitsPerPixel);
else EXIT("Neither Screen nor Image color map exists\n");

if ((ImageHeight / NumColors) * NumColors != ImageHeight)
EXIT("Image height specified not dividable by #colors\n");

if (++ImageNum == ImageN) {
/* This is the image we should make histogram for: */
Line = (RowType) malloc(GifFileIn -> IWidth *
sizeof(PixelType));
fprintf(stderr, "\n%s: Image %d at (%d, %d) [%dx%d]: ",
ProgramName, ImageNum,
GifFileIn -> ILeft, GifFileIn -> ITop,
GifFileIn -> IWidth, GifFileIn -> IHeight);

for (i=0; i IHeight; i++) {
if (DGifGetLine(GifFileIn, Line, GifFileIn -> IWidth)
== ERROR)
QuitGifError(GifFileIn, GifFileOut);
for (j=0; j IWidth; j++)
Histogram[Line[j]]++;
fprintf(stderr, "\b\b\b\b%-4d", i);
}

free((char *) Line);
}
else {
/* Skip the image: */
/* 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) == ERROR)
QuitGifError(GifFileIn, GifFileOut);
while (CodeBlock != NULL)
if (DGifGetCodeNext(GifFileIn, &CodeBlock) == ERROR)
QuitGifError(GifFileIn, GifFileOut);
}
break;
case EXTENSION_RECORD_TYPE:
/* Skip any extension blocks in file: */
if (DGifGetExtension(GifFileIn, &ExtCode, &Extension) == ERROR)
QuitGifError(GifFileIn, GifFileOut);

while (Extension != NULL) {
if (DGifGetExtensionNext(GifFileIn, &Extension) == ERROR)
QuitGifError(GifFileIn, GifFileOut);
}
break;
case TERMINATE_RECORD_TYPE:
break;
default: /* Should be traps by DGifGetRecordType */
break;
}
}
while (RecordType != TERMINATE_RECORD_TYPE);

/* We we requested to kill back ground count: */
if (BackGroundFlag) Histogram[GifFileIn -> SBackGroundColor] = 0;

if (DGifCloseFile(GifFileIn) == ERROR)
QuitGifError(GifFileIn, GifFileOut);


/* We may required to dump out the histogram as text file: */
if (TextFlag) {
for (i=0; i }
else {
/* Open stdout for the histogram output file: */
if ((GifFileOut = EGifOpenFileHandle(1)) == NULL)
QuitGifError(GifFileIn, GifFileOut);

/* Dump out screen descriptor to fit histogram dimensions: */
if (EGifPutScreenDesc(GifFileOut,
ImageWidth, ImageHeight, HISTO_BITS_PER_PIXEL, 0,
HISTO_BITS_PER_PIXEL, HistoColorMap) == ERROR)
QuitGifError(GifFileIn, GifFileOut);

/* Dump out image descriptor to fit histogram dimensions: */
if (EGifPutImageDesc(GifFileOut,
0, 0, ImageWidth, ImageHeight,
FALSE, HISTO_BITS_PER_PIXEL, NULL) == ERROR)
QuitGifError(GifFileIn, GifFileOut);

/* Prepare scan line for histogram file, and find scaler to scale */
/* histogram to be between 0 and ImageWidth: */
Line = (RowType) malloc(ImageWidth * sizeof(PixelType));
for (Scaler=0, i=0; i Scaler)
Scaler = Histogram[i];
Scaler /= ImageWidth;
if (Scaler == 0) Scaler = 1; /* In case maximum is less than width */

/* Dump out the image itself: */
for (Count=ImageHeight, i=0, Color=1; i if ((Size = Histogram[i] / Scaler) > ImageWidth) Size = ImageWidth;
for (j=0; j Line[j] = Color;
for (j=Size; j Line[j] = GifFileOut -> SBackGroundColor;

/* Move to next color: */
if (++Color >= (1 << HISTO_BITS_PER_PIXEL)) Color = 1;

/* Dump this histogram entry as many times as required: */
for (j=0; j if (EGifPutLine(GifFileOut, Line, ImageWidth) == ERROR)
QuitGifError(GifFileIn, GifFileOut);
fprintf(stderr, "\b\b\b\b%-4d", Count--);
}
}

if (EGifCloseFile(GifFileOut) == 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);
}