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273 lines
9.0 KiB
C
273 lines
9.0 KiB
C
/*****************************************************************************
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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 create histogram of the colors used by the given GIF file. *
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* Dumps out GIF file of constants size GIF_WIDTH by GIF_HEIGHT. *
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* Options: *
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* -q : quiet printing mode. *
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* -t : Dump out text instead of GIF - #Colors lines, each with #appearances. *
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* -i W H : size of GIF image to generate. Colors of input GIF file are *
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* spread homogeneously along Height, which better by dividable by the *
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* number of colors in input image. *
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* -n n : select image number to generate histogram to (1 by default). *
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* -b : strip off background color count. *
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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 HAVE_CONFIG_H
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#include <config.h>
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#endif
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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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#ifndef __MSDOS__
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#include <stdlib.h>
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#endif
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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 "GifHisto"
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#define DEFAULT_HISTO_WIDTH 100 /* Histogram image diemnsions. */
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#define DEFAULT_HISTO_HEIGHT 256
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#define HISTO_BITS_PER_PIXEL 2 /* Size of bitmap for histogram GIF. */
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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 toolkit module,\t\tGershon Elber\n\
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(C) Copyright 1989 Gershon Elber.\n";
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static char
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*CtrlStr = "GifHisto q%- t%- s%-Width|Height!d!d n%-ImageNumber!d b%- 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.\n";
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static char
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*CtrlStr =
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PROGRAM_NAME
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" q%- t%- s%-Width|Height!d!d n%-ImageNumber!d b%- h%- GifFile!*s";
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#endif /* SYSV */
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static int
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ImageWidth = DEFAULT_HISTO_WIDTH,
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ImageHeight = DEFAULT_HISTO_HEIGHT,
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ImageN = 1;
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static GifColorType
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HistoColorMap[] = { /* Constant bit map for histograms: */
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{ 0, 0, 0 },
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{ 255, 0, 0 },
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{ 0, 255, 0 },
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{ 0, 0, 255 }
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};
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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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int main(int argc, char **argv)
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{
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int i, j, Size, Error, NumFiles, ExtCode, CodeSize, NumColors = 2, Color,
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Count, ImageNum = 0, TextFlag = FALSE, SizeFlag = FALSE,
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ImageNFlag = FALSE, BackGroundFlag = FALSE, HelpFlag = FALSE;
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long Scaler, Histogram[256];
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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, &GifQuietPrint,
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&TextFlag, &SizeFlag, &ImageWidth, &ImageHeight,
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&ImageNFlag, &ImageN, &BackGroundFlag,
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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(EXIT_FAILURE);
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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(EXIT_SUCCESS);
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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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for (i = 0; i < 256; i++) Histogram[i] = 0; /* Reset counters. */
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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 (GifFileIn->Image.ColorMap)
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NumColors = GifFileIn->Image.ColorMap->ColorCount;
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else if (GifFileIn->SColorMap)
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NumColors = GifFileIn->SColorMap->ColorCount;
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else
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GIF_EXIT("Neither Screen nor Image color map exists.");
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if ((ImageHeight / NumColors) * NumColors != ImageHeight)
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GIF_EXIT("Image height specified not dividable by #colors.");
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if (++ImageNum == ImageN) {
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/* This is the image we should make histogram for: */
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Line = (GifRowType) malloc(GifFileIn->Image.Width *
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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->Image.Left, GifFileIn->Image.Top,
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GifFileIn->Image.Width, GifFileIn->Image.Height);
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for (i = 0; i < GifFileIn->Image.Height; i++) {
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if (DGifGetLine(GifFileIn, Line, GifFileIn->Image.Width)
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== GIF_ERROR)
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QuitGifError(GifFileIn, GifFileOut);
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for (j = 0; j < GifFileIn->Image.Width; j++)
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Histogram[Line[j]]++;
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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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/* Skip the image: */
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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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QuitGifError(GifFileIn, GifFileOut);
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while (CodeBlock != NULL)
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if (DGifGetCodeNext(GifFileIn, &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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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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/* We we requested to kill back ground count: */
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if (BackGroundFlag) Histogram[GifFileIn->SBackGroundColor] = 0;
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if (DGifCloseFile(GifFileIn) == GIF_ERROR)
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QuitGifError(GifFileIn, GifFileOut);
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/* We may required to dump out the histogram as text file: */
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if (TextFlag) {
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for (i = 0; i < NumColors; i++)
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printf("%12ld %3d\n", Histogram[i], i);
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}
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else {
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/* Open stdout for the histogram output file: */
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if ((GifFileOut = EGifOpenFileHandle(1)) == NULL)
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QuitGifError(GifFileIn, GifFileOut);
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/* Dump out screen descriptor to fit histogram dimensions: */
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if (EGifPutScreenDesc(GifFileOut,
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ImageWidth, ImageHeight, HISTO_BITS_PER_PIXEL, 0,
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MakeMapObject(4, HistoColorMap)) == GIF_ERROR)
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QuitGifError(GifFileIn, GifFileOut);
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/* Dump out image descriptor to fit histogram dimensions: */
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if (EGifPutImageDesc(GifFileOut,
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0, 0, ImageWidth, ImageHeight, FALSE, NULL) == GIF_ERROR)
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QuitGifError(GifFileIn, GifFileOut);
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/* Prepare scan line for histogram file, and find scaler to scale */
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/* histogram to be between 0 and ImageWidth: */
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Line = (GifRowType) malloc(ImageWidth * sizeof(GifPixelType));
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for (Scaler = 0, i = 0; i < NumColors; i++) if (Histogram[i] > Scaler)
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Scaler = Histogram[i];
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Scaler /= ImageWidth;
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if (Scaler == 0) Scaler = 1; /* In case maximum is less than width. */
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/* Dump out the image itself: */
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for (Count = ImageHeight, i = 0, Color = 1; i < NumColors; i++) {
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if ((Size = Histogram[i] / Scaler) > ImageWidth) Size = ImageWidth;
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for (j = 0; j < Size; j++)
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Line[j] = Color;
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for (j = Size; j < ImageWidth; j++)
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Line[j] = GifFileOut->SBackGroundColor;
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/* Move to next color: */
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if (++Color >= (1 << HISTO_BITS_PER_PIXEL)) Color = 1;
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/* Dump this histogram entry as many times as required: */
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for (j = 0; j < ImageHeight / NumColors; j++) {
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if (EGifPutLine(GifFileOut, Line, ImageWidth) == GIF_ERROR)
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QuitGifError(GifFileIn, GifFileOut);
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GifQprintf("\b\b\b\b%-4d", Count--);
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}
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}
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if (EGifCloseFile(GifFileOut) == GIF_ERROR)
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QuitGifError(GifFileIn, GifFileOut);
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}
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return 0;
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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(EXIT_FAILURE);
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}
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