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- /*****************************************************************************
- * "Gif-Lib" - Yet another gif library. *
- * *
- * Written by: Gershon Elber IBM PC Ver 0.1, Jul. 1989 *
- ******************************************************************************
- * Program to dump GIF file into EPSON type printers *
- * Options: *
- * -d factor : use dithering of matrix of size factor by factor. *
- * -t level : set the threshold level of white in the result (0..100). *
- * -m mapping : methods for mapping the 24bits colors into 1 BW bit. *
- * -p printer : specify printer to print to (lpt1: by default). *
- * -n : nice mode : uses double density to achieve better quality. *
- * -i : invert the image. *
- * -h : on line help. *
- ******************************************************************************
- * History: *
- * 15 Jul 89 - Version 1.0 by Gershon Elber. *
- *****************************************************************************/
-
- #include <graphics.h>
- #include <stdio.h>
- #include <stdlib.h>
- #include <ctype.h>
- #include <alloc.h>
- #include <string.h>
- #include <io.h>
- #include <dos.h>
- #include <bios.h>
- #include <fcntl.h>
- #include "gif_lib.h"
- #include "getarg.h"
-
- #define PROGRAM_NAME "Gif2Epsn"
- #define VERSION "ß Version 1.0, "
- #define DEFAULT_PRINTER "lpt1"
-
- #define C2BW_BACK_GROUND 0 /*Methods to map 24bits Colors to 1 BW bit */
- #define C2BW_GREY_LEVELS 1
- #define C2BW_DITHER 2
- #define C2BW_NUM_METHODS 3 /* Always hold # of methods */
-
- #define DEFAULT_THRESHOLD 5000 /* Color -> BW threshold level */
-
- #define DITHER_MIN_MATRIX 2
- #define DITHER_MAX_MATRIX 4
-
- /* The epson specific are defined here: */
- #define EPSON_WIDTH 80 /* 80 char per line */
- #define EPSON_PIXEL_2_CHAR 8 /* 8 pixels per char, in REG_DENSITY */
-
- #define EPSON_ESC "\x1b" /* Actually regular escape char */
- #define EPSON_RESET EPSON_ESC "@" /* Reset the printer */
- #define EPSON_VERTICAL_SPACE EPSON_ESC "A" "\x08" /* 8/72 inch vertically */
- #define EPSON_REG_DENSITY EPSON_ESC "K" /* 640 pixels per 7.5" (line) */
- #define EPSON_DUAL_DENSITY EPSON_ESC "L" /* 1280 pixels per 7.5" (line) */
-
- 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
- " d%-DitherSize!d t%-BWThreshold!d m%-Mapping!d i%- n%- p%-PrinterName!s h%- GifFile!*s";
- static char
- *PrinterName = DEFAULT_PRINTER;
- static char
- *ProgramName;
- /* Make some variables global, so we could access them faster: */
- static int
- ImageNum = 0,
- BackGround = 0,
- DitherSize = 2, DitherFlag = FALSE,
- BWThresholdFlag = FALSE, Threshold,
- BWThreshold = DEFAULT_THRESHOLD, /* Color -> BW mapping threshold */
- Mapping, MappingFlag = FALSE,
- InvertFlag = FALSE,
- NiceFlag = FALSE,
- PrinterFlag = FALSE,
- HelpFlag = FALSE,
- ColorToBWMapping = C2BW_BACK_GROUND,
- 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 EvalDitheredScanline(RowType *ScreenBuffer, int Row,
- int RowSize, RowType *DitherBuffer);
- static void DumpScreen2Epsn(RowType *ScreenBuffer,
- int ScreenWidth, int ScreenHeight);
- static void PutString(FILE *Prt, int DirectPrint, char *Str, int Len);
- static void PutString2(FILE *Prt, int DirectPrint, char *Str, int Len);
-
- /******************************************************************************
- * 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;
- ByteType *Extension;
- char **FileName = NULL;
- RowType *ScreenBuffer;
- GifFileType *GifFile;
-
- if (strlen(ProgramName = argv[0]) == 0) /* DOS 3.x only! */
- ProgramName = PROGRAM_NAME; /* Do something reasonable for 2.x */
-
- if ((Error = GAGetArgs(argc, argv, CtrlStr, &DitherFlag, &DitherSize,
- &BWThresholdFlag, &Threshold, &MappingFlag, &Mapping,
- &InvertFlag, &NiceFlag, &PrinterFlag, &PrinterName, &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 (DitherFlag) {
- /* Make sure we are o.k.: */
- if (DitherSize > DITHER_MAX_MATRIX) DitherSize = DITHER_MAX_MATRIX;
- if (DitherSize < DITHER_MIN_MATRIX) DitherSize = DITHER_MAX_MATRIX;
- }
-
- /* As Threshold is in [0..100] range and BWThreshold is [0..25500]: */
- if (BWThresholdFlag) {
- if (Threshold > 100 || Threshold < 0)
- EXIT("Threshold not in 0..100 percent");
- BWThreshold = Threshold * 255;
- if (BWThreshold == 0) BWThreshold = 1; /* Overcome divide by zero! */
- }
-
- /* No message is emitted, but mapping method is clipped to exists method */
- if (MappingFlag) ColorToBWMapping = Mapping % C2BW_NUM_METHODS;
-
- if (NumFiles == 1) {
- if ((GifFile = DGifOpenFileName(*FileName)) == NULL) {
- PrintGifError();
- exit(-1);
- }
- }
- else {
- /* Use the stdin instead: */
-
- setmode(0, O_BINARY);
- 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 = (RowType *)
- malloc(GifFile -> SHeight * sizeof(RowType *))) == NULL)
- EXIT("Failed to allocate memory required, aborted");
-
- Size = GifFile -> SWidth * sizeof(PixelType);/* Size in bytes of one row */
- if ((ScreenBuffer[0] = (RowType) malloc(Size)) == NULL) /* First row */
- EXIT("Failed to allocate memory required, aborted");
-
- for (i=0; i<GifFile -> SWidth; i++) /* And set its color to BackGround */
- ScreenBuffer[0][i] = GifFile -> SBackGroundColor;
- for (i=1; i<GifFile -> SHeight; i++) {
- /* Allocate the other rows, andset their color to background too: */
- if ((ScreenBuffer[i] = (RowType) malloc(Size)) == NULL)
- EXIT("Failed to allocate memory required, aborted\n");
-
- memcpy(ScreenBuffer[i], ScreenBuffer[0], Size);
- }
-
- /* Scan the content of the GIF file and load the image(s) in: */
- do {
- if (DGifGetRecordType(GifFile, &RecordType) == ERROR) {
- PrintGifError();
- exit(-1);
- }
- switch (RecordType) {
- case IMAGE_DESC_RECORD_TYPE:
- if (DGifGetImageDesc(GifFile) == ERROR) {
- PrintGifError();
- exit(-1);
- }
- Row = GifFile -> ITop; /* Image Position relative to Screen */
- Col = GifFile -> ILeft;
- Width = GifFile -> IWidth;
- Height = GifFile -> IHeight;
- fprintf(stderr, "\n%s: Image %d at (%d, %d) [%dx%d]: ",
- ProgramName, ++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]) {
- fprintf(stderr, "\b\b\b\b%-4d", Count++);
- if (DGifGetLine(GifFile, &ScreenBuffer[j][Col],
- Width) == ERROR) {
- PrintGifError();
- exit(-1);
- }
- }
- }
- else {
- for (i=0; i<Height; i++) {
- fprintf(stderr, "\b\b\b\b%-4d", i);
- if (DGifGetLine(GifFile, &ScreenBuffer[Row++][Col],
- Width) == ERROR) {
- PrintGifError();
- exit(-1);
- }
- }
- }
- break;
- case EXTENSION_RECORD_TYPE:
- /* Skip any extension blocks in file: */
- if (DGifGetExtension(GifFile, &ExtCode, &Extension) == ERROR) {
- PrintGifError();
- exit(-1);
- }
- while (Extension != NULL) {
- if (DGifGetExtensionNext(GifFile, &Extension) == 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);
- DumpScreen2Epsn(ScreenBuffer, GifFile -> SWidth, GifFile -> SHeight);
-
- if (DGifCloseFile(GifFile) == ERROR) {
- PrintGifError();
- exit(-1);
- }
- }
-
- /*****************************************************************************
- * Routine to evaluate dithered scanlines out of given ones, using Size *
- * dithering matrix, starting from Row. The given scanlines are NOT modified. *
- *****************************************************************************/
- static void EvalDitheredScanline(RowType *ScreenBuffer, int Row,
- int RowSize, RowType *DitherBuffer)
- {
- static char Dither2[2][2] = { /* See Foley & Van Dam pp. 597-601 */
- { 1, 3 },
- { 4, 2 }
- };
- static char Dither3[3][3] = {
- { 7, 9, 5 },
- { 2, 1, 4 },
- { 6, 3, 8 }
- };
- static char Dither4[4][4] = {
- { 1, 9, 3, 11 },
- { 13, 5, 15, 7 },
- { 4, 12, 2, 10 },
- { 16, 8, 14, 6 }
- };
- int i, j, k, Level;
- long Intensity;
- GifColorType *ColorMapEntry;
-
- /* Scan the Rows (Size rows) evaluate intensity every Size pixel and use */
- /* the dither matrix to set the dithered result; */
- for (i=0; i<=RowSize-DitherSize; i+=DitherSize) {
- Intensity = 0;
- for (j=Row; j<Row+DitherSize; j++)
- for (k=0; k<DitherSize; k++) {
- ColorMapEntry = &ColorMap[ScreenBuffer[j][i+k]];
- Intensity += 30 * ((int) ColorMapEntry->Red) +
- 59 * ((int) ColorMapEntry->Green) +
- 11 * ((int) ColorMapEntry->Blue);
- }
-
- /* Find the intensity level (between 0 and Size^2) of our matrix: */
- /* Expression is "Intensity * BWThreshold / (25500 * DefThresh)" */
- /* but to prevent from overflow in the long evaluation we do this:*/
- Level = ((Intensity / 2550) * ((long) DEFAULT_THRESHOLD) /
- (((long) BWThreshold) * 10));
- switch (DitherSize) {
- case 2:
- for (j=0; j<DitherSize; j++)
- for (k=0; k<DitherSize; k++)
- DitherBuffer[j][i+k] = Dither2[j][k] <= Level;
- break;
- case 3:
- for (j=0; j<DitherSize; j++)
- for (k=0; k<DitherSize; k++)
- DitherBuffer[j][i+k] = Dither3[j][k] <= Level;
- break;
- case 4:
- for (j=0; j<DitherSize; j++)
- for (k=0; k<DitherSize; k++)
- DitherBuffer[j][i+k] = Dither4[j][k] <= Level;
- break;
- }
- }
- }
-
- /******************************************************************************
- * The real dumping routine. Few things are taken into account: *
- * 1. The Nice flag. If TRUE each pixel is printed twice in double density. *
- * 2. The Invert flag. If TRUE each pixel before drawn is inverted. *
- * 3. The rendering mode and dither matrix flag if dithering is selected. *
- * The image is drawn from ScreenBuffer ScreenTop/Left in the bottom/right *
- * directions. *
- * Unfortunatelly, there is a BUG in DOS that does not handle ctrl-Z *
- * correctly if we open lptx: device in binary mode (should treat it as any *
- * other char). Therefore I had to write to it directly using biosprint. I *
- * dont like it either, and if you have better way to do it, let me know. *
- ******************************************************************************/
- static void DumpScreen2Epsn(RowType *ScreenBuffer,
- int ScreenWidth, int ScreenHeight)
- {
- int i, j, p, Size, LeftCWidth, Len, DirectPrint = 0,
- DitheredLinesLeft = 0, DitheredLinesCount, MapInvert[2];
- char LinePrefixLen[2]; /* Length of scan line */
- ByteType *EpsonBuffer;
- PixelType *Line;
- RowType *DitherBuffer;
- GifColorType *ColorMapEntry;
- FILE *Prt = NULL;
-
- strupr(PrinterName);
- if (strcmp(PrinterName, "LPT1") == 0 ||
- strcmp(PrinterName, "PRN") == 0) DirectPrint = 1;
- if (strcmp(PrinterName, "LPT2") == 0) DirectPrint = 2;
- if (strcmp(PrinterName, "LPT3") == 0) DirectPrint = 2;
-
- if (!DirectPrint) {
- if ((Prt = fopen(PrinterName, "wb")) == NULL)
- EXIT("Failed to open output (printer) file\n");
- setvbuf(Prt, NULL, _IOFBF, FILE_BUFFER_SIZE); /* Fully buffered! */
- }
-
- if ((EpsonBuffer = malloc(ScreenWidth)) == NULL)
- EXIT("Failed to allocate memory required, aborted");
-
- /* Allocate the buffer to save the dithered information. */
- if (ColorToBWMapping == C2BW_DITHER) {
- if ((DitherBuffer = (RowType *)
- malloc(DITHER_MAX_MATRIX * sizeof(RowType *))) != NULL) {
- Size = ScreenWidth * sizeof(PixelType); /* Size of one row */
- for (i=0; i<DITHER_MAX_MATRIX; i++) {
- if ((DitherBuffer[i] = (RowType) malloc(Size)) == NULL) {
- DitherBuffer = NULL;
- break;
- }
- }
- }
- if (DitherBuffer == NULL)
- EXIT("Failed to allocate memory required, aborted");
- }
- else DitherBuffer = NULL;
-
- /* Reset the printer, and make sure no space between adjacent lines: */
- PutString(Prt, DirectPrint, EPSON_RESET, 2);
- PutString(Prt, DirectPrint, EPSON_VERTICAL_SPACE, 3);
-
- /* Prepar the left spacing to begin with, so image will be in the middle */
- LeftCWidth = (EPSON_WIDTH - (ScreenWidth / EPSON_PIXEL_2_CHAR)) / 2;
-
- if (InvertFlag) { /* Make the inversion as fast a possible. */
- MapInvert[0] = 1;
- MapInvert[1] = 0;
- }
- else {
- MapInvert[0] = 0;
- MapInvert[1] = 1;
- }
-
- for (i=0, p=0; i<ScreenHeight; i++, p++) {
- fprintf(stderr, "\b\b\b\b%-4d", ScreenHeight - i);
- Line = ScreenBuffer[i];
-
- /* If 8 lines were accumulated in the printer buffer - dump them out */
- if (p == 8) {
- for (Len=ScreenWidth-1; Len>=0; Len--) if (EpsonBuffer[Len]) break;
-
- /* Only in case this line is not empty: */
- if (Len++ >= 0) {
- /* Make the left space, so image will be centered: */
- for (j=0; j<LeftCWidth; j++)
- PutString(Prt, DirectPrint, " ", 1);
-
- /* Full printer line is ready to be dumped - send it out: */
- if (NiceFlag) {
- PutString(Prt, DirectPrint, EPSON_DUAL_DENSITY, 2);
- LinePrefixLen[0] = (Len * 2) % 256;
- LinePrefixLen[1] = (Len * 2) / 256;
- PutString(Prt, DirectPrint, LinePrefixLen, 2);
- PutString2(Prt, DirectPrint, (char *) EpsonBuffer, Len);
- }
- else {
- PutString(Prt, DirectPrint, EPSON_REG_DENSITY, 2);
- LinePrefixLen[0] = Len % 256;
- LinePrefixLen[1] = Len / 256;
- PutString(Prt, DirectPrint, LinePrefixLen, 2);
- PutString(Prt, DirectPrint, (char *) EpsonBuffer, Len);
- }
- }
- PutString(Prt, DirectPrint, "\x0d" "\x0a", 2);
- p = 0;
- }
-
- /* We decide right here what method to map Colors to BW so the inner */
- /* loop will be independent of it (and therefore faster): */
- switch(ColorToBWMapping) {
- case C2BW_BACK_GROUND:
- for (j=0; j<ScreenWidth; j++)
- EpsonBuffer[j] = (EpsonBuffer[j] << 1) +
- MapInvert[Line[j] != BackGround];
- break;
- case C2BW_GREY_LEVELS:
- for (j=0; j<ScreenWidth; j++) {
- ColorMapEntry = &ColorMap[Line[j]];
- /* For the transformation from RGB to BW, see Folley & */
- /* Van Dam pp 613: The Y channel is the BW we need: */
- /* As colors are 255 maximum, the result can be up to */
- /* 25500 which is still in range of our 16 bits integers */
- EpsonBuffer[j] = (EpsonBuffer[j] << 1) +
- MapInvert[(30 * (int) ColorMapEntry->Red) +
- 59 * ((int) ColorMapEntry->Green) +
- 11 * ((int) ColorMapEntry->Blue) >
- BWThreshold];
- }
- break;
- case C2BW_DITHER:
- if (DitheredLinesLeft-- == 0) {
- EvalDitheredScanline(ScreenBuffer,
- (i < ScreenHeight - DitherSize ? i :
- ScreenHeight - DitherSize),
- ScreenWidth, DitherBuffer);
- DitheredLinesLeft = DitherSize - 1;
- DitheredLinesCount = 0;
- }
- Line = DitherBuffer[DitheredLinesCount++];
- for (j=0; j<ScreenWidth; j++)
- EpsonBuffer[j] = (EpsonBuffer[j] << 1) +
- MapInvert[Line[j]];
- break;
- }
- }
-
- /* If buffer in incomplete - complete it and dump it out: */
- if (p != 0) {
- for (Len=ScreenWidth-1; Len>=0; Len--) if (EpsonBuffer[Len]) break;
- if (Len++ >= 0) {
- i = 8 - p; /* Amount to shift */
- for (j=0; j<ScreenWidth; j++) EpsonBuffer[j] <<= i;
-
- /* Make the left space, so image will be centered: */
- for (j=0; j<LeftCWidth; j++) PutString(Prt, DirectPrint, " ", 1);
-
- if (NiceFlag) {
- PutString(Prt, DirectPrint, EPSON_DUAL_DENSITY, 2);
- LinePrefixLen[0] = (Len * 2) % 256;
- LinePrefixLen[1] = (Len * 2) / 256;
- PutString(Prt, DirectPrint, LinePrefixLen, 2);
- PutString2(Prt, DirectPrint, (char *) EpsonBuffer, Len);
- }
- else {
- PutString(Prt, DirectPrint, EPSON_REG_DENSITY, 2);
- LinePrefixLen[0] = Len % 256;
- LinePrefixLen[1] = Len / 256;
- PutString(Prt, DirectPrint, LinePrefixLen, 2);
- PutString(Prt, DirectPrint, (char *) EpsonBuffer, Len);
- }
- }
- PutString(Prt, DirectPrint, "\x0d" "\x0a", 2);
- }
-
- fclose(Prt);
- }
-
- /******************************************************************************
- * Dumps the string of given length, to Prt. No char in Str has special *
- * meaning, and even zero (NULL) chars are dumped. *
- * If however DirectPrint is non zero, string is dumped to specifed lpt port. *
- ******************************************************************************/
- static void PutString(FILE *Prt, int DirectPrint, char *Str, int Len)
- {
- int i;
-
- if (DirectPrint)
- for (i=0; i<Len; i++) biosprint(0, Str[i], DirectPrint - 1);
- else for (i=0; i<Len; i++) fputc(Str[i], Prt);
- }
-
- /******************************************************************************
- * Dumps the string of given length, to Prt. No char in Str has special *
- * meaning, and even zero (NULL) chars are dumped. Every char is dumped twice. *
- * If however DirectPrint is non zero, string is dumped to specifed lpt port. *
- ******************************************************************************/
- static void PutString2(FILE *Prt, int DirectPrint, char *Str, int Len)
- {
- int i;
-
- if (DirectPrint)
- for (i=0; i<Len; i++) {
- biosprint(0, Str[i], DirectPrint - 1);
- biosprint(0, Str[i], DirectPrint - 1);
- }
- else
- for (i=0; i<Len; i++) {
- fputc(Str[i], Prt);
- fputc(Str[i], Prt);
- }
- }
-