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- /*****************************************************************************
- * "Gif-Lib" - Yet another gif library. *
- * *
- * Written by: Gershon Elber Ver 0.1, Jul. 1989 *
- ******************************************************************************
- * Program to convert GIF file RLE format (utah raster toolkit). *
- * Options: *
- * -q : quite printing mode. *
- * -a : add alpha channel with full coverage. *
- * -h : on line help. *
- ******************************************************************************
- * History: *
- * 5 Jan 90 - Version 1.0 by Gershon Elber. *
- *****************************************************************************/
-
- #ifdef __MSDOS__
- #include <graphics.h>
- #include <stdlib.h>
- #include <alloc.h>
- #include <io.h>
- #include <dos.h>
- #include <bios.h>
- #endif /* __MSDOS__ */
-
- #include <stdio.h>
- #include <ctype.h>
- #include <string.h>
- #include <fcntl.h>
- #include "gif_lib.h"
- #include "getarg.h"
-
- #include "rle.h" /* The rle tool kit header files. */
-
- #define PROGRAM_NAME "Gif2Rle"
-
- #ifdef __MSDOS__
- extern unsigned int
- _stklen = 16384; /* Increase default stack size. */
- #endif /* __MSDOS__ */
-
- #ifdef SYSV
- static char *VersionStr =
- "Gif library module,\t\tGershon Elber\n\
- (C) Copyright 1989 Gershon Elber, Non commercial use only.\n";
- static char
- *CtrlStr = "Gif2Rle q%- a%- h%- GifFile!*s";
- #else
- static char
- *VersionStr =
- PROGRAM_NAME
- GIF_LIB_VERSION
- " Gershon Elber, "
- __DATE__ ", " __TIME__ "\n"
- "(C) Copyright 1989 Gershon Elber, Non commercial use only.\n";
- static char
- *CtrlStr =
- PROGRAM_NAME
- " q%- a%- h%- GifFile!*s";
- #endif /* SYSV */
-
- /* Make some variables global, so we could access them faster: */
- static int
- ImageNum = 0,
- BackGround = 0,
- AlphaFlag = FALSE,
- HelpFlag = FALSE,
- ColorMapSize = 0,
- InterlacedOffset[] = { 0, 4, 2, 1 }, /* The way Interlaced image should. */
- InterlacedJumps[] = { 8, 8, 4, 2 }; /* be read - offsets and jumps... */
- static GifColorType
- *ColorMap;
-
- static void DumpScreen2Rle(GifRowType *ScreenBuffer,
- int ScreenWidth, int ScreenHeight);
-
- /******************************************************************************
- * Interpret the command line and scan the given GIF file. *
- ******************************************************************************/
- void main(int argc, char **argv)
- {
- int i, j, Error, NumFiles, Size, Row, Col, Width, Height, ExtCode, Count;
- GifRecordType RecordType;
- GifByteType *Extension;
- char **FileName = NULL;
- GifRowType *ScreenBuffer;
- GifFileType *GifFile;
-
- if ((Error = GAGetArgs(argc, argv, CtrlStr, &GifQuitePrint,
- &AlphaFlag, &HelpFlag, &NumFiles, &FileName)) != FALSE ||
- (NumFiles > 1 && !HelpFlag)) {
- if (Error)
- GAPrintErrMsg(Error);
- else if (NumFiles > 1)
- GIF_MESSAGE("Error in command line parsing - one GIF file please.");
- GAPrintHowTo(CtrlStr);
- exit(1);
- }
-
- if (HelpFlag) {
- fprintf(stderr, VersionStr);
- GAPrintHowTo(CtrlStr);
- exit(0);
- }
-
- if (NumFiles == 1) {
- if ((GifFile = DGifOpenFileName(*FileName)) == NULL) {
- PrintGifError();
- exit(-1);
- }
- }
- else {
- /* Use the stdin instead: */
-
- #ifdef __MSDOS__
- setmode(0, O_BINARY);
- #endif /* __MSDOS__ */
- if ((GifFile = DGifOpenFileHandle(0)) == NULL) {
- PrintGifError();
- exit(-1);
- }
- }
-
- /* Allocate the screen as vector of column of rows. We cannt allocate */
- /* the all screen at once, as this broken minded CPU can allocate up to */
- /* 64k at a time and our image can be bigger than that: */
- /* Note this screen is device independent - its the screen as defined by */
- /* the GIF file parameters itself. */
- if ((ScreenBuffer = (GifRowType *)
- malloc(GifFile -> SHeight * sizeof(GifRowType *))) == NULL)
- GIF_EXIT("Failed to allocate memory required, aborted.");
-
- Size = GifFile -> SWidth * sizeof(GifPixelType);/* Size in bytes one row.*/
- if ((ScreenBuffer[0] = (GifRowType) malloc(Size)) == NULL) /* First row. */
- GIF_EXIT("Failed to allocate memory required, aborted.");
-
- for (i = 0; i < GifFile -> SWidth; i++) /* Set its color to BackGround. */
- ScreenBuffer[0][i] = GifFile -> SBackGroundColor;
- for (i = 1; i < GifFile -> SHeight; i++) {
- /* Allocate the other rows, and set their color to background too: */
- if ((ScreenBuffer[i] = (GifRowType) malloc(Size)) == NULL)
- GIF_EXIT("Failed to allocate memory required, aborted.");
-
- memcpy(ScreenBuffer[i], ScreenBuffer[0], Size);
- }
-
- /* Scan the content of the GIF file and load the image(s) in: */
- do {
- if (DGifGetRecordType(GifFile, &RecordType) == GIF_ERROR) {
- PrintGifError();
- exit(-1);
- }
- switch (RecordType) {
- case IMAGE_DESC_RECORD_TYPE:
- if (DGifGetImageDesc(GifFile) == GIF_ERROR) {
- PrintGifError();
- exit(-1);
- }
- Row = GifFile -> ITop; /* Image Position relative to Screen. */
- Col = GifFile -> ILeft;
- Width = GifFile -> IWidth;
- Height = GifFile -> IHeight;
- GifQprintf("\n%s: Image %d at (%d, %d) [%dx%d]: ",
- PROGRAM_NAME, ++ImageNum, Col, Row, Width, Height);
- if (GifFile -> ILeft + GifFile -> IWidth > GifFile -> SWidth ||
- GifFile -> ITop + GifFile -> IHeight > GifFile -> SHeight) {
- fprintf(stderr, "Image %d is not confined to screen dimension, aborted.\n");
- exit(-2);
- }
- if (GifFile -> IInterlace) {
- /* Need to perform 4 passes on the images: */
- for (Count = i = 0; i < 4; i++)
- for (j = Row + InterlacedOffset[i]; j < Row + Height;
- j += InterlacedJumps[i]) {
- GifQprintf("\b\b\b\b%-4d", Count++);
- if (DGifGetLine(GifFile, &ScreenBuffer[j][Col],
- Width) == GIF_ERROR) {
- PrintGifError();
- exit(-1);
- }
- }
- }
- else {
- for (i = 0; i < Height; i++) {
- GifQprintf("\b\b\b\b%-4d", i);
- if (DGifGetLine(GifFile, &ScreenBuffer[Row++][Col],
- Width) == GIF_ERROR) {
- PrintGifError();
- exit(-1);
- }
- }
- }
- break;
- case EXTENSION_RECORD_TYPE:
- /* Skip any extension blocks in file: */
- if (DGifGetExtension(GifFile, &ExtCode, &Extension) == GIF_ERROR) {
- PrintGifError();
- exit(-1);
- }
- while (Extension != NULL) {
- if (DGifGetExtensionNext(GifFile, &Extension) == GIF_ERROR) {
- PrintGifError();
- exit(-1);
- }
- }
- break;
- case TERMINATE_RECORD_TYPE:
- break;
- default: /* Should be traps by DGifGetRecordType. */
- break;
- }
- }
- while (RecordType != TERMINATE_RECORD_TYPE);
-
- /* Lets display it - set the global variables required and do it: */
- BackGround = GifFile -> SBackGroundColor;
- ColorMap = (GifFile -> IColorMap ? GifFile -> IColorMap :
- GifFile -> SColorMap);
- ColorMapSize = 1 << (GifFile -> IColorMap ? GifFile -> IBitsPerPixel :
- GifFile -> SBitsPerPixel);
- DumpScreen2Rle(ScreenBuffer, GifFile -> SWidth, GifFile -> SHeight);
-
- if (DGifCloseFile(GifFile) == GIF_ERROR) {
- PrintGifError();
- exit(-1);
- }
- }
-
- /******************************************************************************
- * The real dumping routine. *
- ******************************************************************************/
- static void DumpScreen2Rle(GifRowType *ScreenBuffer,
- int ScreenWidth, int ScreenHeight)
- {
- int i, j;
- char Comment[80];
- rle_pixel *rows[4];
- GifRowType GifRow;
- static GifColorType
- *ColorMapEntry;
-
- if (AlphaFlag) RLE_SET_BIT(rle_dflt_hdr, RLE_ALPHA);
- rle_dflt_hdr.alpha = AlphaFlag != 0;
- rle_dflt_hdr.rle_file = stdout;
- rle_dflt_hdr.xmin = 0;
- rle_dflt_hdr.ymin = 0;
- rle_dflt_hdr.xmax = ScreenWidth - 1;
- rle_dflt_hdr.ymax = ScreenHeight - 1;
- sprintf(Comment, "origin=GIF format, %d colors.", ColorMapSize);
- rle_putcom(Comment, &rle_dflt_hdr);
- rle_put_setup(&rle_dflt_hdr);
-
- for (i = 0; i < 4; i++)
- if ((rows[i] = (rle_pixel *) malloc(sizeof(rle_pixel) * ScreenWidth))
- == NULL)
- GIF_EXIT("Failed to allocated memory required, aborted.");
-
- if (AlphaFlag) {
- /* Initial the alpha channel to full coverage: */
- for (i = 0; i < ScreenWidth; i++) rows[0][i] = 255;
- }
-
- for (i = 0; i < ScreenHeight; i++) {
- /* Flip the image vertically as rle files start at the bollom... */
- GifRow = ScreenBuffer[ScreenHeight - i - 1];
- GifQprintf("\b\b\b\b%-4d", ScreenHeight - i);
- for (j = 0; j < ScreenWidth; j++) {
- ColorMapEntry = &ColorMap[GifRow[j]];
- rows[1][j] = ColorMapEntry -> Red;
- rows[2][j] = ColorMapEntry -> Green;
- rows[3][j] = ColorMapEntry -> Blue;
- }
- rle_putrow( &rows[1], ScreenWidth, &rle_dflt_hdr );
- }
-
- rle_puteof( &rle_dflt_hdr );
- }
-