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- /*****************************************************************************
- * "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 <stdio.h>
- #include <stdlib.h>
- #include <ctype.h>
- #include <alloc.h>
- #include <string.h>
- #include "gif_lib.h"
- #include "getarg.h"
-
- #define PROGRAM_NAME "GifHisto"
- #define VERSION "ß 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<GifFileIn -> IHeight; i++) {
- if (DGifGetLine(GifFileIn, Line, GifFileIn -> IWidth)
- == ERROR)
- QuitGifError(GifFileIn, GifFileOut);
- for (j=0; j<GifFileIn -> 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<NumColors; i++) printf("%12ld %3d\n", Histogram[i], 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<NumColors; i++) if (Histogram[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<NumColors; i++) {
- if ((Size = Histogram[i] / Scaler) > ImageWidth) Size = ImageWidth;
- for (j=0; j<Size; j++)
- Line[j] = Color;
- for (j=Size; j<ImageWidth; 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<ImageHeight / NumColors; 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);
- }
-