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G/UTIL/GIF2RLE.C
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276
G/UTIL/GIF2RLE.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 convert GIF file RLE format (utah raster toolkit). *
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* Options: *
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* -q : quite printing mode. *
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* -a : add alpha channel with full coverage. *
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* -h : on line help. *
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******************************************************************************
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* History: *
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* 5 Jan 90 - Version 1.0 by Gershon Elber. *
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*****************************************************************************/
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#ifdef __MSDOS__
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#include <graphics.h>
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#include <stdlib.h>
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#include <alloc.h>
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#include <io.h>
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#include <dos.h>
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#include <bios.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 <fcntl.h>
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#include "gif_lib.h"
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#include "getarg.h"
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#include "rle.h" /* The rle tool kit header files. */
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#define PROGRAM_NAME "Gif2Rle"
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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 = "Gif2Rle q%- a%- 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%- a%- 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 int
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ImageNum = 0,
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BackGround = 0,
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AlphaFlag = FALSE,
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HelpFlag = FALSE,
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ColorMapSize = 0,
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InterlacedOffset[] = { 0, 4, 2, 1 }, /* The way Interlaced image should. */
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InterlacedJumps[] = { 8, 8, 4, 2 }; /* be read - offsets and jumps... */
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static GifColorType
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*ColorMap;
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static void DumpScreen2Rle(GifRowType *ScreenBuffer,
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int ScreenWidth, int ScreenHeight);
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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, j, Error, NumFiles, Size, Row, Col, Width, Height, ExtCode, Count;
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GifRecordType RecordType;
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GifByteType *Extension;
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char **FileName = NULL;
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GifRowType *ScreenBuffer;
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GifFileType *GifFile;
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if ((Error = GAGetArgs(argc, argv, CtrlStr, &GifQuitePrint,
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&AlphaFlag, &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 (NumFiles == 1) {
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if ((GifFile = DGifOpenFileName(*FileName)) == NULL) {
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PrintGifError();
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exit(-1);
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}
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}
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else {
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/* Use the stdin instead: */
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#ifdef __MSDOS__
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setmode(0, O_BINARY);
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#endif /* __MSDOS__ */
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if ((GifFile = DGifOpenFileHandle(0)) == NULL) {
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PrintGifError();
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exit(-1);
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}
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}
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/* Allocate the screen as vector of column of rows. We cannt allocate */
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/* the all screen at once, as this broken minded CPU can allocate up to */
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/* 64k at a time and our image can be bigger than that: */
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/* Note this screen is device independent - its the screen as defined by */
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/* the GIF file parameters itself. */
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if ((ScreenBuffer = (GifRowType *)
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malloc(GifFile -> SHeight * sizeof(GifRowType *))) == NULL)
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GIF_EXIT("Failed to allocate memory required, aborted.");
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Size = GifFile -> SWidth * sizeof(GifPixelType);/* Size in bytes one row.*/
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if ((ScreenBuffer[0] = (GifRowType) malloc(Size)) == NULL) /* First row. */
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GIF_EXIT("Failed to allocate memory required, aborted.");
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for (i = 0; i < GifFile -> SWidth; i++) /* Set its color to BackGround. */
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ScreenBuffer[0][i] = GifFile -> SBackGroundColor;
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for (i = 1; i < GifFile -> SHeight; i++) {
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/* Allocate the other rows, and set their color to background too: */
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if ((ScreenBuffer[i] = (GifRowType) malloc(Size)) == NULL)
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GIF_EXIT("Failed to allocate memory required, aborted.");
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memcpy(ScreenBuffer[i], ScreenBuffer[0], Size);
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}
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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(GifFile, &RecordType) == GIF_ERROR) {
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PrintGifError();
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exit(-1);
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}
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switch (RecordType) {
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case IMAGE_DESC_RECORD_TYPE:
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if (DGifGetImageDesc(GifFile) == GIF_ERROR) {
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PrintGifError();
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exit(-1);
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}
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Row = GifFile -> ITop; /* Image Position relative to Screen. */
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Col = GifFile -> ILeft;
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Width = GifFile -> IWidth;
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Height = GifFile -> IHeight;
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GifQprintf("\n%s: Image %d at (%d, %d) [%dx%d]: ",
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PROGRAM_NAME, ++ImageNum, Col, Row, Width, Height);
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if (GifFile -> ILeft + GifFile -> IWidth > GifFile -> SWidth ||
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GifFile -> ITop + GifFile -> IHeight > GifFile -> SHeight) {
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fprintf(stderr, "Image %d is not confined to screen dimension, aborted.\n");
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exit(-2);
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}
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if (GifFile -> IInterlace) {
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/* Need to perform 4 passes on the images: */
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for (Count = i = 0; i < 4; i++)
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for (j = Row + InterlacedOffset[i]; j < Row + Height;
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j += InterlacedJumps[i]) {
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GifQprintf("\b\b\b\b%-4d", Count++);
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if (DGifGetLine(GifFile, &ScreenBuffer[j][Col],
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Width) == GIF_ERROR) {
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PrintGifError();
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exit(-1);
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}
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}
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}
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else {
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for (i = 0; i < Height; i++) {
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GifQprintf("\b\b\b\b%-4d", i);
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if (DGifGetLine(GifFile, &ScreenBuffer[Row++][Col],
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Width) == GIF_ERROR) {
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PrintGifError();
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exit(-1);
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}
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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(GifFile, &ExtCode, &Extension) == GIF_ERROR) {
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PrintGifError();
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exit(-1);
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}
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while (Extension != NULL) {
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if (DGifGetExtensionNext(GifFile, &Extension) == GIF_ERROR) {
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PrintGifError();
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exit(-1);
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}
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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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/* Lets display it - set the global variables required and do it: */
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BackGround = GifFile -> SBackGroundColor;
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ColorMap = (GifFile -> IColorMap ? GifFile -> IColorMap :
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GifFile -> SColorMap);
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ColorMapSize = 1 << (GifFile -> IColorMap ? GifFile -> IBitsPerPixel :
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GifFile -> SBitsPerPixel);
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DumpScreen2Rle(ScreenBuffer, GifFile -> SWidth, GifFile -> SHeight);
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if (DGifCloseFile(GifFile) == GIF_ERROR) {
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PrintGifError();
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exit(-1);
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}
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}
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/******************************************************************************
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* The real dumping routine. *
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******************************************************************************/
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static void DumpScreen2Rle(GifRowType *ScreenBuffer,
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int ScreenWidth, int ScreenHeight)
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{
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int i, j;
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char Comment[80];
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rle_pixel *rows[4];
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GifRowType GifRow;
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static GifColorType
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*ColorMapEntry;
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if (AlphaFlag) RLE_SET_BIT(rle_dflt_hdr, RLE_ALPHA);
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rle_dflt_hdr.alpha = AlphaFlag != 0;
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rle_dflt_hdr.rle_file = stdout;
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rle_dflt_hdr.xmin = 0;
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rle_dflt_hdr.ymin = 0;
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rle_dflt_hdr.xmax = ScreenWidth - 1;
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rle_dflt_hdr.ymax = ScreenHeight - 1;
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sprintf(Comment, "origin=GIF format, %d colors.", ColorMapSize);
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rle_putcom(Comment, &rle_dflt_hdr);
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rle_put_setup(&rle_dflt_hdr);
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for (i = 0; i < 4; i++)
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if ((rows[i] = (rle_pixel *) malloc(sizeof(rle_pixel) * ScreenWidth))
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== NULL)
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GIF_EXIT("Failed to allocated memory required, aborted.");
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if (AlphaFlag) {
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/* Initial the alpha channel to full coverage: */
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for (i = 0; i < ScreenWidth; i++) rows[0][i] = 255;
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}
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for (i = 0; i < ScreenHeight; i++) {
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/* Flip the image vertically as rle files start at the bollom... */
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GifRow = ScreenBuffer[ScreenHeight - i - 1];
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GifQprintf("\b\b\b\b%-4d", ScreenHeight - i);
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for (j = 0; j < ScreenWidth; j++) {
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ColorMapEntry = &ColorMap[GifRow[j]];
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rows[1][j] = ColorMapEntry -> Red;
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rows[2][j] = ColorMapEntry -> Green;
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rows[3][j] = ColorMapEntry -> Blue;
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}
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rle_putrow( &rows[1], ScreenWidth, &rle_dflt_hdr );
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}
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rle_puteof( &rle_dflt_hdr );
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}
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