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337 lines
10 KiB
C
337 lines
10 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 convert GIF file to RGB 24 bits. *
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* Options: *
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* -q : quiet printing mode. *
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* -1 : dump as one file using RGBRGB triples. *
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* -h : on-line help. *
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* -o FileName : specify the output file name(s). *
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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 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 <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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#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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#ifdef HAVE_FCNTL_H
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#include <fcntl.h>
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#endif /* HAVE_FCNTL_H */
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#include "gif_lib.h"
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#include "getarg.h"
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#define PROGRAM_NAME "Gif2RGB"
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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 = "Gif2RGB q%- 1%- o%-OutFileName!s 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%- 1%- o%-OutFileName!s 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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OneFileFlag = FALSE,
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HelpFlag = FALSE,
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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 ColorMapObject
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*ColorMap;
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static void DumpScreen2RGB(char *FileName, int OneFileFlag,
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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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int 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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OutFileFlag = FALSE;
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GifRecordType RecordType;
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GifByteType *Extension;
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char *OutFileName,
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**FileName = NULL;
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GifRowType *ScreenBuffer;
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GifFileType *GifFile;
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if ((Error = GAGetArgs(argc, argv, CtrlStr, &GifQuietPrint,
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&OneFileFlag, &OutFileFlag, &OutFileName,
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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 (!OutFileFlag) OutFileName = NULL;
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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(EXIT_FAILURE);
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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(EXIT_FAILURE);
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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(EXIT_FAILURE);
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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(EXIT_FAILURE);
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}
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Row = GifFile->Image.Top; /* Image Position relative to Screen. */
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Col = GifFile->Image.Left;
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Width = GifFile->Image.Width;
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Height = GifFile->Image.Height;
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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->Image.Left + GifFile->Image.Width > GifFile->SWidth ||
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GifFile->Image.Top + GifFile->Image.Height > GifFile->SHeight) {
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fprintf(stderr, "Image %d is not confined to screen dimension, aborted.\n",ImageNum);
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exit(EXIT_FAILURE);
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}
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if (GifFile->Image.Interlace) {
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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(EXIT_FAILURE);
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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(EXIT_FAILURE);
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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(EXIT_FAILURE);
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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(EXIT_FAILURE);
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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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} while (RecordType != TERMINATE_RECORD_TYPE);
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/* Lets dump it - set the global variables required and do it: */
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BackGround = GifFile->SBackGroundColor;
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ColorMap = (GifFile->Image.ColorMap
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? GifFile->Image.ColorMap
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: GifFile->SColorMap);
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if (ColorMap == NULL) {
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fprintf(stderr, "Gif Image does not have a colormap\n");
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exit(EXIT_FAILURE);
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}
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DumpScreen2RGB(OutFileName, OneFileFlag,
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ScreenBuffer, GifFile->SWidth, GifFile->SHeight);
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if (DGifCloseFile(GifFile) == GIF_ERROR) {
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PrintGifError();
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exit(EXIT_FAILURE);
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}
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return 0;
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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 DumpScreen2RGB(char *FileName, int OneFileFlag,
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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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GifRowType GifRow;
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static GifColorType *ColorMapEntry;
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FILE *f[3];
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if (FileName != NULL) {
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char OneFileName[80];
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if (OneFileFlag) {
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if ((f[0] = fopen(FileName, "wb")) == NULL)
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GIF_EXIT("Can't open input file name.");
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} else {
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static char *Postfixes[] = { ".R", ".G", ".B" };
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for (i = 0; i < 3; i++) {
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strcpy(OneFileName, FileName);
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strcat(OneFileName, Postfixes[i]);
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if ((f[i] = fopen(OneFileName, "wb")) == NULL) {
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GIF_EXIT("Can't open input file name.");
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}
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}
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}
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} else {
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OneFileFlag = TRUE;
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#ifdef __MSDOS__
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setmode(0, O_BINARY);
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#endif /* __MSDOS__ */
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f[0] = stdout;
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}
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if (OneFileFlag) {
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unsigned char *Buffer, *BufferP;
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if ((Buffer = (unsigned char *) malloc(ScreenWidth * 3)) == NULL)
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GIF_EXIT("Failed to allocate memory required, aborted.");
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for (i = 0; i < ScreenHeight; i++) {
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GifRow = ScreenBuffer[i];
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GifQprintf("\b\b\b\b%-4d", ScreenHeight - i);
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for (j = 0, BufferP = Buffer; j < ScreenWidth; j++) {
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ColorMapEntry = &ColorMap->Colors[GifRow[j]];
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*BufferP++ = ColorMapEntry->Red;
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*BufferP++ = ColorMapEntry->Green;
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*BufferP++ = ColorMapEntry->Blue;
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}
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if (fwrite(Buffer, ScreenWidth * 3, 1, f[0]) != 1)
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GIF_EXIT("Write to file(s) failed.");
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}
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free((char *) Buffer);
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fclose(f[0]);
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} else {
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unsigned char *Buffers[3];
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if ((Buffers[0] = (unsigned char *) malloc(ScreenWidth)) == NULL ||
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(Buffers[1] = (unsigned char *) malloc(ScreenWidth)) == NULL ||
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(Buffers[2] = (unsigned char *) malloc(ScreenWidth)) == NULL)
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GIF_EXIT("Failed to allocate memory required, aborted.");
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for (i = 0; i < ScreenHeight; i++) {
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GifRow = ScreenBuffer[i];
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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->Colors[GifRow[j]];
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Buffers[0][j] = ColorMapEntry->Red;
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Buffers[1][j] = ColorMapEntry->Green;
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Buffers[2][j] = ColorMapEntry->Blue;
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}
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if (fwrite(Buffers[0], ScreenWidth, 1, f[0]) != 1 ||
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fwrite(Buffers[1], ScreenWidth, 1, f[1]) != 1 ||
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fwrite(Buffers[2], ScreenWidth, 1, f[2]) != 1)
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GIF_EXIT("Write to file(s) failed.");
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}
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free((char *) Buffers[0]);
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free((char *) Buffers[1]);
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free((char *) Buffers[2]);
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fclose(f[0]);
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fclose(f[1]);
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fclose(f[2]);
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}
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}
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