Category : C Source Code
Archive   : GIF_LIB.ZIP
Filename : GIF2EPSN.C

 
Output of file : GIF2EPSN.C contained in archive : GIF_LIB.ZIP

/*****************************************************************************
* "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
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include "gif_lib.h"
#include "getarg.h"

#define PROGRAM_NAME "Gif2Epsn"
#define VERSION "á 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 SWidth; i++) /* And set its color to BackGround */
ScreenBuffer[0][i] = GifFile -> SBackGroundColor;
for (i=1; i 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 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 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 for (k=0; 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 for (k=0; k DitherBuffer[j][i+k] = Dither2[j][k] <= Level;
break;
case 3:
for (j=0; j for (k=0; k DitherBuffer[j][i+k] = Dither3[j][k] <= Level;
break;
case 4:
for (j=0; j for (k=0; 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 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 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 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 EpsonBuffer[j] = (EpsonBuffer[j] << 1) +
MapInvert[Line[j] != BackGround];
break;
case C2BW_GREY_LEVELS:
for (j=0; 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 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
/* Make the left space, so image will be centered: */
for (j=0; j
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 else for (i=0; i }

/******************************************************************************
* 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 biosprint(0, Str[i], DirectPrint - 1);
biosprint(0, Str[i], DirectPrint - 1);
}
else
for (i=0; i fputc(Str[i], Prt);
fputc(Str[i], Prt);
}
}