72032afdde
* Fix POSTSCRIPTSTREAM to accept SMALLP values 0 and 1 as COLOR. (Don't require them to be FLOATP.) * Changed handling when color values are not directly interpretable without other context (e.g., as an index into a color map). POSTSCRIPTSTREAM should behave similar to INTERPRESS and just ignore a BRUSHCOLOR if it is a SMALLP that's neither 0 nor 1, and use the current DSPCOLOR of the stream. If someone wants a specific color, or grayscale, they can use the color descriptions as documented in POSTSCRIPTSTREAM.TEDIT. * Update documentation to better describe allowed COLOR specification.
85 lines
16 KiB
Plaintext
85 lines
16 KiB
Plaintext
en·vÅos POSTSCRIPTSTREAM
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POSTSCRIPTSTREAM
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By: Matt Heffron (then: mheffron@orion.cf.uci.edu, now: heffron@alumni.caltech.edu)
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INTRODUCTION
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The PostScriptStream package defines a set of imageops for printers which understand the PostScriptÔ page description language by Adobe. At Beckman we have successfully used TEdit, Sketch, LISTFILES, and HARDCOPYW to an Apple LaserWriter and an AST TurboLaser PS. The PostScriptStream imagestream driver installs itself when it is loaded. All symbols in the PostScriptStream driver are located in the INTERLISP: package.
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VARIABLES
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POSTSCRIPT.FONT.ALIST [InitVariable]
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POSTSCRIPT.FONT.ALIST is an ALIST mapping Xerox Lisp font names into the root names of PostScript font files. It is also used for font family coercions. The default value should be acceptable for any of the fonts which are built into the Apple Laserwriter.
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POSTSCRIPTFONTDIRECTORIES [InitVariable]
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POSTSCRIPTFONTDIRECTORIES is the list of directories where the PostScript .PSCFONT font files can be found. The default value is: ("{DSK}/usr/local/lde/fonts/postscript/") on a Sun or IBM workstation and ("{DSK}<LISPFILES>FONTS>PSC>") for other cases .
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POSTSCRIPT.DEFAULT.PAGEREGION [InitVariable]
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POSTSCRIPT.DEFAULT.PAGEREGION indicates the area of the page to use for text file listings (i.e. LISTFILES). It is in units of 100'ths of points. The default value is: (4800 4800 52800 70800), which gives left and bottom margins of 0.75 inch and top and right margins of 0.5 inch on 8.5 x 11 paper.
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POSTSCRIPT.PAGEREGIONS [InitVariable]
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POSTSCRIPT.PAGEREGIONS is an ALIST mapping pagetypes into paper size and actual imageable area on the page. By default, it knows about LETTER, LEGAL, and NOTE pagetypes, and the corresponding sizes and imageable areas for the Apple Laserwriter. Others can be defined by the user by adding the appropriate entries onto this ALIST.
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POSTSCRIPT.PAGETYPE [InitVariable]
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POSTSCRIPT.PAGETYPE is used by OPENIMAGESTREAM to lookup the paper size and actual imageable area of the page in POSTSCRIPT.PAGEREGIONS to determine the initial margins. This value can be overridden with the PAGETYPE or PAPERTYPE options in the OPENIMAGESTREAM call. The name of the type of page selected is NOT passed through to the PostScript output.
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\POSTSCRIPT.MAX.WILD.FONTSIZE [InitVariable]
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\POSTSCRIPT.MAX.WILD.FONTSIZE indicates the maximum point size that should be returned from FONTSAVAILABLE when the SIZE argument is wild (i.e. *). All integer pointsizes from 1 to \POSTSCRIPT.MAX.WILD.FONTSIZE will be indicated as available. The default value is: 72.
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POSTSCRIPT.PREFER.LANDSCAPE [InitVariable]
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POSTSCRIPT.PREFER.LANDSCAPE indicates if the OPENIMAGESTREAM method should default the orientation of output files to LANDSCAPE. It can have one of three values: NIL, T, or ASK. NIL means prefer portrait orientation output, T means prefer landscape, and ASK says to bring up a menu to ask the preferred orientation if it wasn't explicitly indicated in the OPENIMAGESTREAM call (with the ROTATION option). The default value is: NIL. An item (PS Orientation) is added to the Background Menu to let you change the value of this variable.
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POSTSCRIPT.TEXTFILE.LANDSCAPE [InitVariable]
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POSTSCRIPT.TEXTFILE.LANDSCAPE indicates if the printing of TEXT files (e.g. LISTFILES, ...) should force the orientation of output files to LANDSCAPE. When it is non-NIL the orientation of output files is forced to LANDSCAPE. (There is no ASK option here.) The default value is: NIL.
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POSTSCRIPT.BITMAP.SCALE [InitVariable]
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POSTSCRIPT.BITMAP.SCALE specifies an independent scale factor for display of bitmap images (e.g. window hardcopies). Values less than 1 will reduce the image size. (I.e. a value of 0.5 will give a half size bitmap image.) The position of the scaled bitmap will still have the SAME lower-left corner (i.e. the scaled bitmap is not centered in the region of the full size bitmap image). The default value is: 1.
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HINT
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Setting POSTSCRIPT.BITMAP.SCALE to 0.96, instead of 1, will give cleaner BITMAP images on a 300 dpi printer. (This corrects for the 72 ppi imagestream vs. the 75 dpi printer, using 4x4 device dots per bitmap pixel.) Also, values of 0.24, 0.48 and 0.72, instead of 0.25, 0.5 and 0.75, will also give cleaner images for reduced size output. In general, use integer multiples of 0.24 for a 300 dpi printer.
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POSTSCRIPT.TEXTURE.SCALE [InitVariable]
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POSTSCRIPT.TEXTURE.SCALE specifies an independent scale for the display of bitmap textures. The value represents the number of device space units per texture unit (bitmap bit). The default value is 4, which represents each bit of the texture as a 4x4 block, so that textures are approximately the same resolution as on the screen (for 300 dpi output devices, such as the Apple Laserwriter).
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The PostScriptStream package extends the allowed representations of a texture, beyond 16-bit FIXP and 16x16 bitmap, to ANY square bitmap. (If the bitmap is not square, its longer edge is truncated from the top or right to make it square.) Use this feature with caution, as large bitmap textures, or sizes other than multiples of 16 bits square, require large amounts of storage in the PostScript interpreter (in the printer controller), and can cause limitcheck errors when actually printing.
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Anywhere that a texture or color can be used on an imagestream or in the specification of a BRUSH, you can instead give either: NIL, a COLOR name, an RGB triple, an HLS triple, a SMALLP 0 or 1, or a FLOATP between 0.0 and 1.0 (inclusive). The value NIL means to use the current DSPCOLOR. For the COLOR name, RGB or HLS values, see the file COLOR.TEDIT in the library directory for descriptions of those. Any integer value other than 0 or 1 will be ignored and the current DSPCOLOR will be used. The single SMALLP or FLOATP value cases represent a PostScript gray shade. 0.0 is black and 1.0 is white. Specifically, the value sets the brightness of the shade. E.g. you can pass 0.33 as the color to DRAWLINE to get a dark gray line. This will be converted to the RGB triple (84 84 84). All forms of the value you specify will be checked for validity.
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POSTSCRIPT.IMAGESIZEFACTOR [InitVariable]
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POSTSCRIPT.IMAGESIZEFACTOR specifies an independent factor to change the overall size of the printed image. This re-sizing affects the entire printed output (specifically, it superimposes its effects upon those of POSTSCRIPT.BITMAP.SCALE and POSTSCRIPT.TEXTURE.SCALE). Values greater than 1 enlarge the printed image, and values less than 1 reduce it. An invalid POSTSCRIPT.IMAGESIZEFACTOR (i.e. not a positive, non-zero number) will use a value of 1. The BITMAPSCALE function for the POSTSCRIPT printer type does NOT consider the POSTSCRIPT.IMAGESIZEFACTOR when determining the scale factor for a bitmap.
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MISCELLANEOUS
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The SCALE of a PostScriptStream imagestream is 100. This is to allow enough resolution in the width information for fonts to enable TEdit to correctly fill and justify text.
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The first time any PostScriptStream imagestream is created (even if only to hardcopy a bitmap or window) the DEFAULTFONT is instantiated (unless a FONTS option was given to the OPENIMAGESTREAM, in which case the initial font for the imagestream will be set to that font, or to the CAR if a list).
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The PostScriptStream imagestream method for FILLPOLYGON uses the global variable FILL.WRULE as the default value for the WINDINGNUMBER argument. (This is the same variable which is used by the DISPLAY imagestream method for FILLPOLYGON.)
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The PostScriptStream imagestream method for OPENIMAGESTREAM (and, therefore, SEND.FILE.TO.PRINTER), supports an IMAGESIZEFACTOR option to change the size of the printed image. The IMAGESIZEFACTOR re-sizing is combined with the POSTSCRIPT.IMAGESIZEFACTOR to produce an overall re-sizing of the printed image. A HEADING option is also supported to give a running header on each page of output. The value of the HEADING option is printed at the top left of the page, followed by "Page " and the appropriate page number. They are printed in the DEFAULTFONT (unless a FONTS option was given to the OPENIMAGESTREAM, in which case it will be that font, or to the CAR if a list).
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I'm pretty sure that the output generated by the PostScript imageops fully conforms to the Adobe Systems Document Structuring Conventions, Version 2.0, January 31, 1987.
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Including Other PostScript Operations
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If you wish to insert your own specific PostScript operations into a PostScriptStream imagestream, you can do so with the following functions:
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(POSTSCRIPT.OUTSTR STREAM STRING) [Function]
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POSTSCRIPT.OUTSTR outputs a string or value to the imagestream. STREAM must be an open PostScriptStream imagestream. STRING is the value to output (STRINGP and LITATOM are most efficient, but any value can be output (its PRIN1 pname is used)).
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(POSTSCRIPT.PUTCOMMAND STREAM STRING1 ... STRINGn) [NoSpread Function]
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POSTSCRIPT.PUTCOMMAND is more general for sequences of commands and values. It calls POSTSCRIPT.OUTSTR repeatedly to output each of the STRINGi arguments to STREAM.
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(\POSTSCRIPT.OUTCHARFN STREAM CHAR) [Function]
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\POSTSCRIPT.OUTCHARFN is used to output the characters forming the text of a PostScript string (e.g. the argument to a show or charpath operator). STREAM is the open PostScriptStream imagestream destination for output, and CHAR is the CHARCODE of the character to output. The / (slash), ( and ) (parenthesis) characters will be quoted with /, and characters with ASCII values less than 32 (space) or greater than 126 (tilde) will be output as /nnn (in octal). \POSTSCRIPT.OUTCHARFN will output the ( character to open the string, if necessary. Use POSTSCRIPT.CLOSESTRING (below) to close the string.
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(POSTSCRIPT.CLOSESTRING STREAM) [Function]
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POSTSCRIPT.CLOSESTRING closes a PostScript string (e.g. the argument to a show or charpath operator). STREAM is the open PostScriptStream imagestream. It is important to use POSTSCRIPT.CLOSESTRING to output the ) character to close the string, because it also clears the stream state flag that indicates that a string is in progress (otherwise, the next POSTSCRIPT.PUTCOMMAND would output the commands to close the string and show it).
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Warning
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Do not attempt to create a PostScript font larger than about 600 points, as much of Interlisp's font information is stored in SMALLP integers, and too large a font would overflow the font's height, or the width for any of the wider characters. (I know that 600 points is a ridiculously large limit (about 8.3 inches), but I thought I'd better mention it, or someone might try it!)
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Changes from the Initial Medley Release
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This second Medley release of the PostScriptStream imagestream driver includes some performance enhancements when writing bitmaps to the output, some SUN-specific code (from Will Snow of envos), implementation of the SCALEDBITBLT, DSPROTATE, and DSPTRANSLATE operations, and a lot of performance enhancements (many thanks to Tom Lipkis of Savoir).
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Changes from the Lyric Release
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The Medley release of this PostScriptStream imagestream driver changed the default value of POSTSCRIPT.TEXTFILE.LANDSCAPE from T to NIL. It also added the support for the HEADING option.
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Known Problems/Limitations
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The output generated for a PostScriptStream imagestream is rather brute force. It isn't particularly careful to generate the smallest output file for a given sequence of operations. Specifically, it often generates extra end-of-lines between PostScript operator sequences (this has no effect on the printed output, only on the file size).
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Using BITMAPs or Functions as BRUSH arguments to the curve drawing functions is not supported, nor is using a non-ROUND BRUSH with DRAWCIRCLE or DRAWELLIPSE.
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The implementation of DSPROTATE accepts ROTATION argument values of 0 and 90 (any non-NIL, non-zero value is converted to 90). A value of 0 converts the page orientation to Portrait, and 90 converts the page orientation to Landscape. These conversions perform the translations necessary to keep the clipping region on the page. (This may or may not be the right thing to do, but since DSPROTATE is undocumented in what it should do, this is what the PostScriptStream driver does).
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There is spotty support for NS character sets other than 0, and there is no additional translation of the character code values from NS encoding to PostScript encoding.
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There is minimal support for color.
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\POSTSCRIPT.OUTCHARFN is pretty wimpy in its handling of TAB characters. It just moves to the next multiple of (eight times the average character width of the current font) from the current left margin. (TEdit does the right thing when generating hardcopy using PostScriptStream.)
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I haven't yet documented how to build the .PSCFONT files from .AFM files for new fonts that become available. (SEQUENCE NIL NIL (0 0 0 0) ((PAGE NIL (PAPERSIZE Letter FOLIOINFO (ARABIC "" "")) (0 0 612 792) ((HEADING NIL (HEADINGTYPE RUNNINGHEAD) (72 732 540 36) NIL) (TEXT NIL NIL (72 72 468 648) NIL))) (ALTERNATE NIL NIL (0 0 0 0) ((PAGE NIL (PAPERSIZE Letter FOLIOINFO (ARABIC "" "")) (0 0 612 792) ((FOLIO NIL (PARALOOKS (QUAD CENTERED) CHARLOOKS (SUPERSCRIPT 0 INVISIBLE OFF SELECTPOINT OFF PROTECTED OFF SIZE 10 FAMILY MODERN OVERLINE OFF STRIKEOUT OFF UNDERLINE OFF EXPANSION REGULAR SLOPE REGULAR WEIGHT MEDIUM INVERTED OFF USERINFO NIL STYLE NIL) FORMATINFO (ARABIC "" "")) (162 48 288 36) NIL) (HEADING NIL (HEADINGTYPE RUNNINGHEAD) (72 732 540 36) NIL) (TEXT NIL NIL (72 72 468 648) NIL))) (PAGE NIL (PAPERSIZE Letter FOLIOINFO (ARABIC "" "")) (0 0 612 792) ((FOLIO NIL (PARALOOKS (QUAD CENTERED) CHARLOOKS (SUPERSCRIPT 0 INVISIBLE OFF SELECTPOINT OFF PROTECTED OFF SIZE 10 FAMILY MODERN OVERLINE OFF STRIKEOUT OFF UNDERLINE OFF EXPANSION REGULAR SLOPE REGULAR WEIGHT MEDIUM INVERTED OFF USERINFO NIL STYLE NIL) FORMATINFO (ARABIC "" "")) (162 48 288 36) NIL) (HEADING NIL (HEADINGTYPE RUNNINGHEAD) (72 732 540 36) NIL) (TEXT NIL NIL (72 72 468 648) NIL)))))))
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MODERN
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GACHA
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MODERN
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MODERN
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HELVETICA
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MODERN
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ÿþ MODERN MODERN CLASSIC CLASSIC
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