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José David Guillén
2021-09-08 21:26:43 +02:00
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/*****************************************************************************
* "Gif-Lib" - Yet another gif library. *
* *
* Written by: Gershon Elber Ver 0.1, Jul. 1989 *
******************************************************************************
* Program to dump GIF file into EPSON type printers *
* Options: *
* -q : quite printing mode. *
* -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. *
* 22 Dec 89 - Fix problems with const strings been modified (Version 1.1). *
*****************************************************************************/
#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"
#define PROGRAM_NAME "Gif2Epsn"
#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 "\033" /* Actually regular escape char. */
#define EPSON_RESET "\033@" /* Reset the printer. */
#define EPSON_VERTICAL_SPACE "\033A\010" /* 8/72 inch vertically. */
#define EPSON_REG_DENSITY "\033K" /* 640 pixels per 7.5" (line). */
#define EPSON_DUAL_DENSITY "\033L" /* 1280 pixels per 7.5" (line). */
#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 = "Gif2Epsn q%- d%-DitherSize!d t%-BWThreshold!d m%-Mapping!d i%- n%- p%-PrinterName!s 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%- d%-DitherSize!d t%-BWThreshold!d m%-Mapping!d i%- n%- p%-PrinterName!s h%- GifFile!*s";
#endif /* SYSV */
static char
*PrinterName = NULL;
/* 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(GifRowType *ScreenBuffer, int Row,
int RowSize, GifRowType *DitherBuffer);
static void DumpScreen2Epsn(GifRowType *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;
GifByteType *Extension;
char **FileName = NULL;
GifRowType *ScreenBuffer;
GifFileType *GifFile;
if ((Error = GAGetArgs(argc, argv, CtrlStr,
&GifQuitePrint, &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)
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 (!PrinterFlag) PrinterName = "";
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)
GIF_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: */
#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, andset their color to background too: */
if ((ScreenBuffer[i] = (GifRowType) malloc(Size)) == NULL)
GIF_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) == 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);
DumpScreen2Epsn(ScreenBuffer, GifFile -> SWidth, GifFile -> SHeight);
if (DGifCloseFile(GifFile) == GIF_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(GifRowType *ScreenBuffer, int Row,
int RowSize, GifRowType *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(GifRowType *ScreenBuffer,
int ScreenWidth, int ScreenHeight)
{
int i, j, p, Size, LeftCWidth, Len, DirectPrint = 0,
DitheredLinesLeft = 0, DitheredLinesCount = 0, MapInvert[2];
char LinePrefixLen[2]; /* Length of scan line. */
GifByteType *EpsonBuffer;
GifPixelType *Line;
GifRowType *DitherBuffer;
GifColorType *ColorMapEntry;
FILE *Prt = NULL;
#ifdef __MSDOS__
for (i = 0; i < strlen(PrinterName); i++)
if (islower(PrinterName[i]))
PrinterName[i] = toupper(PrinterName[i]);
if (strcmp(PrinterName, "LPT1") == 0 ||
strcmp(PrinterName, "PRN") == 0)
DirectPrint = 1;
else if (strcmp(PrinterName, "LPT2") == 0)
DirectPrint = 2;
else if (strcmp(PrinterName, "LPT3") == 0)
DirectPrint = 3;
#endif /* __MSDOS__ */
if (!DirectPrint) {
#ifdef __MSDOS__
if (strlen(PrinterName) == 0) {
setmode(1, O_BINARY); /* Make sure it is in binary mode. */
Prt = stdout;
}
else if ((Prt = fopen(PrinterName, "wb")) == NULL ||
setvbuf(Prt, NULL, _IOFBF, GIF_FILE_BUFFER_SIZE))
#else
if (strlen(PrinterName) == 0)
Prt = stdout;
else if ((Prt = fopen(PrinterName, "w")) == NULL)
#endif /* __MSDOS__ */
GIF_EXIT("Failed to open output (printer) file.");
}
if ((EpsonBuffer = (GifByteType *) malloc(ScreenWidth)) == NULL)
GIF_EXIT("Failed to allocate memory required, aborted.");
/* Allocate the buffer to save the dithered information. */
if (ColorToBWMapping == C2BW_DITHER) {
if ((DitherBuffer = (GifRowType *)
malloc(DITHER_MAX_MATRIX * sizeof(GifRowType *))) != NULL) {
Size = ScreenWidth * sizeof(GifPixelType); /* Size of one row. */
for (i = 0; i < DITHER_MAX_MATRIX; i++) {
if ((DitherBuffer[i] = (GifRowType) malloc(Size)) == NULL) {
DitherBuffer = NULL;
break;
}
}
}
if (DitherBuffer == NULL)
GIF_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 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++) {
GifQprintf("\b\b\b\b%-4d", ScreenHeight - i);
Line = ScreenBuffer[i];
/* If 8 lines were accumulated in 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, "\015\012", 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, "\015\012", 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) {
#ifdef __MSDOS__
for (i = 0; i < Len; i++) biosprint(0, Str[i], DirectPrint - 1);
#else
GIF_EXIT("Can not print directly to a printer if not MSDOS.");
#endif /* __MSDOS__ */
}
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) {
#ifdef __MSDOS__
for (i = 0; i < Len; i++) {
biosprint(0, Str[i], DirectPrint - 1);
biosprint(0, Str[i], DirectPrint - 1);
}
#else
GIF_EXIT("Can not print directly to a printer if not MSDOS.");
#endif /* __MSDOS__ */
}
else
for (i = 0; i < Len; i++) {
fputc(Str[i], Prt);
fputc(Str[i], Prt);
}
}