tiff2ps.c

tiff文件开发库

	if (cnt)
	    left_offset += xtran / 2;
	fprintf(fp, "%f %f translate\n", left_offset, bottom_offset);
	fprintf(fp, "%f %f scale\n", xscale, yscale);
	if (rotate)
	    fputs ("1 1 translate 180 rotate\n", fp);

	return splitpage;
}


/* returns the sequence number of the page processed */
int
TIFF2PS(FILE* fd, TIFF* tif, float pw, float ph, double lm, double bm, int cnt)
{
	uint32 w, h;
	float ox, oy, prw, prh;
	float scale = 1.0;
	float left_offset = lm * PS_UNIT_SIZE;
	float bottom_offset = bm * PS_UNIT_SIZE;
	uint32 subfiletype;
	uint16* sampleinfo;
	static int npages = 0;
	int split;

	if (!TIFFGetField(tif, TIFFTAG_XPOSITION, &ox))
		ox = 0;
	if (!TIFFGetField(tif, TIFFTAG_YPOSITION, &oy))
		oy = 0;
	setupPageState(tif, &w, &h, &prw, &prh);

	do {
		tf_numberstrips = TIFFNumberOfStrips(tif);
		TIFFGetFieldDefaulted(tif, TIFFTAG_ROWSPERSTRIP,
		    &tf_rowsperstrip);
		setupPageState(tif, &w, &h, &prw, &prh);
		if (!npages)
			PSHead(fd, tif, w, h, prw, prh, ox, oy);
		TIFFGetFieldDefaulted(tif, TIFFTAG_BITSPERSAMPLE,
		    &bitspersample);
		TIFFGetFieldDefaulted(tif, TIFFTAG_SAMPLESPERPIXEL,
		    &samplesperpixel);
		TIFFGetFieldDefaulted(tif, TIFFTAG_PLANARCONFIG,
		    &planarconfiguration);
		TIFFGetField(tif, TIFFTAG_COMPRESSION, &compression);
		TIFFGetFieldDefaulted(tif, TIFFTAG_EXTRASAMPLES,
		    &extrasamples, &sampleinfo);
		alpha = (extrasamples == 1 &&
			 sampleinfo[0] == EXTRASAMPLE_ASSOCALPHA);
		if (!TIFFGetField(tif, TIFFTAG_PHOTOMETRIC, &photometric)) {
			switch (samplesperpixel - extrasamples) {
			case 1:
				if (isCCITTCompression(tif))
					photometric = PHOTOMETRIC_MINISWHITE;
				else
					photometric = PHOTOMETRIC_MINISBLACK;
				break;
			case 3:
				photometric = PHOTOMETRIC_RGB;
				break;
			case 4:
				photometric = PHOTOMETRIC_SEPARATED;
				break;
			}
		}
		if (checkImage(tif)) {
			tf_bytesperrow = TIFFScanlineSize(tif);
			npages++;
			fprintf(fd, "%%%%Page: %d %d\n", npages, npages);
			if (!generateEPSF && ( level2 || level3 )) {
				float psw,psh;
				if (pw!=0 && ph!=0) {
					psw=pw;
					psh=ph;
			    
				}
				else {
					psw=rotate ? prh:prw;
				    psh=rotate ? prw:prh;		    
				}
				fprintf(fd,
	"1 dict begin /PageSize [ %f %f ] def currentdict end setpagedevice\n",
				        psw, psh);
				fputs(
	"<<\n  /Policies <<\n    /PageSize 3\n  >>\n>> setpagedevice\n",
				      fd);
			}
			fprintf(fd, "gsave\n");
			fprintf(fd, "100 dict begin\n");
			if (pw != 0 && ph != 0) {
				if (maxPageHeight) { /* used -H option */
					split = PlaceImage(fd,pw,ph,prw,prh,0,lm,bm,cnt);
					while( split ) {
					    PSpage(fd, tif, w, h);
					    fprintf(fd, "end\n");
					    fprintf(fd, "grestore\n");
					    fprintf(fd, "showpage\n");
					    npages++;
					    fprintf(fd, "%%%%Page: %d %d\n", npages, npages);
					    fprintf(fd, "gsave\n");
					    fprintf(fd, "100 dict begin\n");
					    split = PlaceImage(fd,pw,ph,prw,prh,split,lm,bm,cnt);
					}
				} else {
					/* NB: maintain image aspect ratio */
					scale = (pw*PS_UNIT_SIZE/prw) < (ph*PS_UNIT_SIZE/prh) ?
					    (pw*PS_UNIT_SIZE/prw) :
					    (ph*PS_UNIT_SIZE/prh);
					if (scale > 1.0)
						scale = 1.0;
					bottom_offset +=
						(ph * PS_UNIT_SIZE - prh * scale) / (cnt?2:1);
					if (cnt)
						left_offset += (pw * PS_UNIT_SIZE - prw * scale) / 2;
					fprintf(fd, "%f %f translate\n",
						left_offset, bottom_offset);
					fprintf(fd, "%f %f scale\n", prw * scale, prh * scale);
					if (rotate)
						fputs ("1 1 translate 180 rotate\n", fd);
				}
			} else {
				fprintf(fd, "%f %f scale\n", prw, prh);
				if (rotate)
					fputs ("1 1 translate 180 rotate\n", fd);
			}
			PSpage(fd, tif, w, h);
			fprintf(fd, "end\n");
			fprintf(fd, "grestore\n");
			fprintf(fd, "showpage\n");
		}
		if (generateEPSF)
			break;
		TIFFGetFieldDefaulted(tif, TIFFTAG_SUBFILETYPE, &subfiletype);
	} while (((subfiletype & FILETYPE_PAGE) || printAll) &&
	    TIFFReadDirectory(tif));

	return(npages);
}


static char DuplexPreamble[] = "\
%%BeginFeature: *Duplex True\n\
systemdict begin\n\
  /languagelevel where { pop languagelevel } { 1 } ifelse\n\
  2 ge { 1 dict dup /Duplex true put setpagedevice }\n\
  { statusdict /setduplex known { statusdict begin setduplex true end } if\n\
  } ifelse\n\
end\n\
%%EndFeature\n\
";

static char TumblePreamble[] = "\
%%BeginFeature: *Tumble True\n\
systemdict begin\n\
  /languagelevel where { pop languagelevel } { 1 } ifelse\n\
  2 ge { 1 dict dup /Tumble true put setpagedevice }\n\
  { statusdict /settumble known { statusdict begin true settumble end } if\n\
  } ifelse\n\
end\n\
%%EndFeature\n\
";

static char AvoidDeadZonePreamble[] = "\
gsave newpath clippath pathbbox grestore\n\
  4 2 roll 2 copy translate\n\
  exch 3 1 roll sub 3 1 roll sub exch\n\
  currentpagedevice /PageSize get aload pop\n\
  exch 3 1 roll div 3 1 roll div abs exch abs\n\
  2 copy gt { exch } if pop\n\
  dup 1 lt { dup scale } { pop } ifelse\n\
";

void
PSHead(FILE *fd, TIFF *tif, uint32 w, uint32 h, float pw, float ph,
	float ox, float oy)
{
	time_t t;

	(void) tif; (void) w; (void) h;
	t = time(0);
	fprintf(fd, "%%!PS-Adobe-3.0%s\n", generateEPSF ? " EPSF-3.0" : "");
	fprintf(fd, "%%%%Creator: tiff2ps\n");
	fprintf(fd, "%%%%Title: %s\n", filename);
	fprintf(fd, "%%%%CreationDate: %s", ctime(&t));
	fprintf(fd, "%%%%DocumentData: Clean7Bit\n");
	fprintf(fd, "%%%%Origin: %ld %ld\n", (long) ox, (long) oy);
	/* NB: should use PageBoundingBox */
	fprintf(fd, "%%%%BoundingBox: 0 0 %ld %ld\n",
	    (long) ceil(pw), (long) ceil(ph));
	fprintf(fd, "%%%%LanguageLevel: %d\n", (level3 ? 3 : (level2 ? 2 : 1)));
	fprintf(fd, "%%%%Pages: (atend)\n");
	fprintf(fd, "%%%%EndComments\n");
	fprintf(fd, "%%%%BeginSetup\n");
	if (PSduplex)
		fprintf(fd, "%s", DuplexPreamble);
	if (PStumble)
		fprintf(fd, "%s", TumblePreamble);
	if (PSavoiddeadzone && (level2 || level3))
		fprintf(fd, "%s", AvoidDeadZonePreamble);
	fprintf(fd, "%%%%EndSetup\n");
}

void
PSTail(FILE *fd, int npages)
{
	fprintf(fd, "%%%%Trailer\n");
	fprintf(fd, "%%%%Pages: %d\n", npages);
	fprintf(fd, "%%%%EOF\n");
}

static int
checkcmap(TIFF* tif, int n, uint16* r, uint16* g, uint16* b)
{
	(void) tif;
	while (n-- > 0)
		if (*r++ >= 256 || *g++ >= 256 || *b++ >= 256)
			return (16);
	TIFFWarning(filename, "Assuming 8-bit colormap");
	return (8);
}

static void
PS_Lvl2colorspace(FILE* fd, TIFF* tif)
{
	uint16 *rmap, *gmap, *bmap;
	int i, num_colors;
	const char * colorspace_p;

	switch ( photometric )
	{
	case PHOTOMETRIC_SEPARATED:
		colorspace_p = "CMYK";
		break;

	case PHOTOMETRIC_RGB:
		colorspace_p = "RGB";
		break;

	default:
		colorspace_p = "Gray";
	}

	/*
	 * Set up PostScript Level 2 colorspace according to
	 * section 4.8 in the PostScript refenence manual.
	 */
	fputs("% PostScript Level 2 only.\n", fd);
	if (photometric != PHOTOMETRIC_PALETTE) {
		if (photometric == PHOTOMETRIC_YCBCR) {
		    /* MORE CODE HERE */
		}
		fprintf(fd, "/Device%s setcolorspace\n", colorspace_p );
		return;
	}

	/*
	 * Set up an indexed/palette colorspace
	 */
	num_colors = (1 << bitspersample);
	if (!TIFFGetField(tif, TIFFTAG_COLORMAP, &rmap, &gmap, &bmap)) {
		TIFFError(filename,
			"Palette image w/o \"Colormap\" tag");
		return;
	}
	if (checkcmap(tif, num_colors, rmap, gmap, bmap) == 16) {
		/*
		 * Convert colormap to 8-bits values.
		 */
#define	CVT(x)		(((x) * 255) / ((1L<<16)-1))
		for (i = 0; i < num_colors; i++) {
			rmap[i] = CVT(rmap[i]);
			gmap[i] = CVT(gmap[i]);
			bmap[i] = CVT(bmap[i]);
		}
#undef CVT
	}
	fprintf(fd, "[ /Indexed /DeviceRGB %d", num_colors - 1);
	if (ascii85) {
		Ascii85Init();
		fputs("\n<~", fd);
		ascii85breaklen -= 2;
	} else
		fputs(" <", fd);
	for (i = 0; i < num_colors; i++) {
		if (ascii85) {
			Ascii85Put(rmap[i], fd);
			Ascii85Put(gmap[i], fd);
			Ascii85Put(bmap[i], fd);
		} else {
			fputs((i % 8) ? " " : "\n  ", fd);
			fprintf(fd, "%02x%02x%02x",
			    rmap[i], gmap[i], bmap[i]);
		}
	}
	if (ascii85)
		Ascii85Flush(fd);
	else
		fputs(">\n", fd);
	fputs("] setcolorspace\n", fd);
}

static int
PS_Lvl2ImageDict(FILE* fd, TIFF* tif, uint32 w, uint32 h)
{
	int use_rawdata;
	uint32 tile_width, tile_height;
	uint16 predictor, minsamplevalue, maxsamplevalue;
	int repeat_count;
	char im_h[64], im_x[64], im_y[64];
	char * imageOp = "image";

	if ( useImagemask && (bitspersample == 1) )
		imageOp = "imagemask";

	(void)strcpy(im_x, "0");
	(void)sprintf(im_y, "%lu", (long) h);
	(void)sprintf(im_h, "%lu", (long) h);
	tile_width = w;
	tile_height = h;
	if (TIFFIsTiled(tif)) {
		repeat_count = TIFFNumberOfTiles(tif);
		TIFFGetField(tif, TIFFTAG_TILEWIDTH, &tile_width);
		TIFFGetField(tif, TIFFTAG_TILELENGTH, &tile_height);
		if (tile_width > w || tile_height > h ||
		    (w % tile_width) != 0 || (h % tile_height != 0)) {
			/*
			 * The tiles does not fit image width and height.
			 * Set up a clip rectangle for the image unit square.
			 */
			fputs("0 0 1 1 rectclip\n", fd);
		}
		if (tile_width < w) {
			fputs("/im_x 0 def\n", fd);
			(void)strcpy(im_x, "im_x neg");
		}
		if (tile_height < h) {
			fputs("/im_y 0 def\n", fd);
			(void)sprintf(im_y, "%lu im_y sub", (unsigned long) h);
		}
	} else {
		repeat_count = tf_numberstrips;
		tile_height = tf_rowsperstrip;
		if (tile_height > h)
			tile_height = h;
		if (repeat_count > 1) {
			fputs("/im_y 0 def\n", fd);
			fprintf(fd, "/im_h %lu def\n",
			    (unsigned long) tile_height);
			(void)strcpy(im_h, "im_h");
			(void)sprintf(im_y, "%lu im_y sub", (unsigned long) h);
		}
	}

	/*
	 * Output start of exec block
	 */
	fputs("{ % exec\n", fd);

	if (repeat_count > 1)
		fprintf(fd, "%d { %% repeat\n", repeat_count);

	/*
	 * Output filter options and image dictionary.
	 */
	if (ascii85)
		fputs(" /im_stream currentfile /ASCII85Decode filter def\n",
		    fd);
	fputs(" <<\n", fd);
	fputs("  /ImageType 1\n", fd);
	fprintf(fd, "  /Width %lu\n", (unsigned long) tile_width);
	/*
	 * Workaround for some software that may crash when last strip
	 * of image contains fewer number of scanlines than specified
	 * by the `/Height' variable. So for stripped images with multiple
	 * strips we will set `/Height' as `im_h', because one is 
	 * recalculated for each strip - including the (smaller) final strip.
	 * For tiled images and images with only one strip `/Height' will
	 * contain number of scanlines in tile (or image height in case of
	 * one-stripped image).
	 */
	if (TIFFIsTiled(tif) || tf_numberstrips == 1)
		fprintf(fd, "  /Height %lu\n", (unsigned long) tile_height);
	else
		fprintf(fd, "  /Height im_h\n");
	
	if (planarconfiguration == PLANARCONFIG_SEPARATE && samplesperpixel > 1)
		fputs("  /MultipleDataSources true\n", fd);
	fprintf(fd, "  /ImageMatrix [ %lu 0 0 %ld %s %s ]\n",
	    (unsigned long) w, - (long)h, im_x, im_y);
	fprintf(fd, "  /BitsPerComponent %d\n", bitspersample);
	fprintf(fd, "  /Interpolate %s\n", interpolate ? "true" : "false");

	switch (samplesperpixel - extrasamples) {
	case 1:
		switch (photometric) {
		case PHOTOMETRIC_MINISBLACK:
			fputs("  /Decode [0 1]\n", fd);
			break;
		case PHOTOMETRIC_MINISWHITE:
			switch (compression) {
			case COMPRESSION_CCITTRLE:
			case COMPRESSION_CCITTRLEW:
			case COMPRESSION_CCITTFAX3:
			case COMPRESSION_CCITTFAX4:
				/*
				 * Manage inverting with /Blackis1 flag
				 * since there migth be uncompressed parts
				 */
				fputs("  /Decode [0 1]\n", fd);
				break;
			default:
				/*
				 * ERROR...
				 */
				fputs("  /Decode [1 0]\n", fd);
				break;
			}
			break;
		case PHOTOMETRIC_PALETTE:
			TIFFGetFieldDefaulted(tif, TIFFTAG_MINSAMPLEVALUE,
			    &minsamplevalue);
			TIFFGetFieldDefaulted(tif, TIFFTAG_MAXSAMPLEVALUE,
			    &maxsamplevalue);
			fprintf(fd, "  /Decode [%u %u]\n",
				    minsamplevalue, maxsamplevalue);
			break;
		default:
			/*
			 * ERROR ?
			 */
			fputs("  /Decode [0 1]\n", fd);
			break;
		}
		break;
	case 3:
		switch (photometric) {
		case PHOTOMETRIC_RGB:
			fputs("  /Decode [0 1 0 1 0 1]\n", fd);
			break;
		case PHOTOMETRIC_MINISWHITE:
		case PHOTOMETRIC_MINISBLACK:
		default:
			/*
			 * ERROR??
			 */
			fputs("  /Decode [0 1 0 1 0 1]\n", fd);
			break;
		}
		break;
	case 4:
		/*
		 * ERROR??
		 */
		fputs("  /Decode [0 1 0 1 0 1 0 1]\n", fd);
		break;
	}
	fputs("  /DataSource", fd);
	if (planarconfiguration == PLANARCONFIG_SEPARATE &&
	    samplesperpixel > 1)
		fputs(" [", fd);
	if (ascii85)
		fputs(" im_stream", fd);
	else
		fputs(" currentfile /ASCIIHexDecode filter", fd);

	use_rawdata = TRUE;
	switch (compression) {
	case COMPRESSION_NONE:		/* 1: uncompressed */
		break;
	case COMPRESSION_CCITTRLE:	/* 2: CCITT modified Huffman RLE */
	case COMPRESSION_CCITTRLEW:	/* 32771: #1 w/ word alignment */
	case COMPRESSION_CCITTFAX3:	/* 3: CCITT Group 3 fax encoding */
	case COMPRESSION_CCITTFAX4:	/* 4: CCITT Group 4 fax encoding */
		fputs("\n\t<<\n", fd);
		if (compression == COMPRESSION_CCITTFAX3) {
			uint32 g3_options;

			fputs("\t /EndOfLine true\n", fd);
			fputs("\t /EndOfBlock false\n", fd);
			if (!TIFFGetField(tif, TIFFTAG_GROUP3OPTIONS,
					    &g3_options))
				g3_options = 0;
			if (g3_options & GROUP3OPT_2DENCODING)
				fprintf(fd, "\t /K %s\n", im_h);
			if (g3_options & GROUP3OPT_UNCOMPRESSED)
				fputs("\t /Uncompressed true\n", fd);
			if (g3_options & GROUP3OPT_FILLBITS)
				fputs("\t /EncodedByteAlign true\n", fd);
		}
		if (compression == COMPRESSION_CCITTFAX4) {
			uint32 g4_options;

			fputs("\t /K -1\n", fd);
			TIFFGetFieldDefaulted(tif, TIFFTAG_GROUP4OPTIONS,
					       &g4_options);
			if (g4_options & GROUP4OPT_UNCOMPRESSED)
				fputs("\t /Uncompressed true\n", fd);
		}
		if (!(tile_width == w && w == 1728U))
			fprintf(fd, "\t /Columns %lu\n",
			    (unsigned long) tile_width);
		fprintf(fd, "\t /Rows %s\n", im_h);
		if (compression == COMPRESSION_CCITTRLE ||
		    compression == COMPRESSION_CCITTRLEW) {
			fputs("\t /EncodedByteAlign true\n", fd);
			fputs("\t /EndOfBlock false\n", fd);
		}
		if (photometric == PHOTOMETRIC_MINISBLACK)
			fputs("\t /BlackIs1 true\n", fd);
		fprintf(fd, "\t>> /CCITTFaxDecode filter");
		break;
	case COMPRESSION_LZW:	/* 5: Lempel-Ziv & Welch */
		TIFFGetFieldDefaulted(tif, TIFFTAG_PREDICTOR, &predictor);
		if (predictor == 2) {
			fputs("\n\t<<\n", fd);
			fprintf(fd, "\t /Predictor %u\n", predictor);
			fprintf(fd, "\t /Columns %lu\n",
			    (unsigned long) tile_width);