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GNU gv - View PostScript and PDF documents using ghostscript.
This is the First edition of the GNU gv Manual, updated for gv version 3.7.4.
Copyright © 1995, 1996, 1997 Johannes Plass
Copyright © 2004 José E. Marchesi
Permission is granted to copy, distribute and/or modify this document under the terms of the GNU General Public License, Version 3 or any later version published by the Free Software Foundation.
| • Introduction: | ||
| • Invoking gv: | ||
| • Resources: | ||
| • Mouse and key bindings: | ||
| • Comments about the user interface: | ||
| • Frequently asked questions: | ||
| • gv internals: | ||
| • GNU General Public License: |
Next: Invoking gv, Previous: Top, Up: Top [Contents][Index]
GNU gv allows to view and navigate through PostScript and PDF documents on an X display by providing a user interface for the ghostscript interpreter.
Please note that gv is derived from Tim Theisen’s ghostview.
Next: Resources, Previous: Introduction, Up: Top [Contents][Index]
Usage: gv [OPTION]... [FILE]
PostScript and PDF viewer.
[-]-monochrome display document using only black and white
[-]-grayscale display document without colors
[-]-color display document as usual
[-]-safer start ghostscript in safe mode
[-]-nosafer do not start ghostscript in safe mode
[-]-safedir start ghostscript from a safe diretory
[-]-nosafedir do not start ghostscript from a safe diretory
[-]-quiet start ghostscript with the -dQUIET option
[-]-noquiet do not start ghostscript with the -dQUIET option
[-]-infoSilent do not show any messages in the info popup window
[-]-infoErrors do not show warning messages in the info popup window
[-]-infoAll do show all messages in the info popup window
[-]-arguments=ARGS start ghostscript with additional options as specified
by the string ARGS
[-]-page=LABEL display the page with label LABEL first
[-]-center the page should be centered automatically
[-]-nocenter the page should not be centered automatically
[-]-media=MEDIA selects the paper size to be used
[-]-orientation=ORIENTATION sets the orientation of the page
[-]-scale=N|f.f selects the scale N, or arbitrary scale f.f
[-]-scalebase=N selects the scale base N
[-]-swap interchange the meaning of the orientations landscape
and seascape
[-]-noswap do not interchange the meaning of the orientation
landscape and seascape
[-]-antialias use antialiasing
[-]-noantialias do not use antialiasing
[-]-dsc dsc comments are respected
[-]-nodsc dsc comments are not respected
[-]-eof ignore the postscript EOF comment while scanning
documents
[-]-noeof do not ignore the postscript EOF comment while
scanning documents
[-]-pixmap use backing pixmap
[-]-nopixmap do not use backing pixmap
[-]-watch watch the document file for changes
[-]-nowatch do not watch the document file for changes
[-]-help print a help message and exit
[-]-usage print a usage message and exit
[-]-resize fit the size of the window to the size of the page
[-]-noresize do not fit the size of the window to the size of the page
-geometry [<width>][x<height>][{+-}<xoffset>{+-}<yoffset>]
[-]-ad=FILE read and use additional resources from FILE
[-]-style=FILE read and use additional resources from FILE. These resources
have lower priority than those provided on the context of --ad
[-]-password=PASSWORD Sets the password for opening encrypted PDF files
[-]-spartan shortcut for --style=gv_spartan.dat
[-]-widgetless shortcut for --style=gv_widgetless.dat
[-]-fullscreen start in fullscreen mode (needs support from WM)
[-]-presentation Presentation mode (fullscreen, Fit to window,
widgetless and no resizing of window)
[-]-version show gv version and exit
fileThe name of the file to be displayed. The file ending .ps may be omitted. file may point to a compressed file (gzipped, bzipped, zipped or compressed). Viewing PDF files requires at least ghostscript version 4.x.
--ad=fileRead and use additional resources from the file
file.
These resources have higher priority than those provided
in the context of the --style option.
--antialias, --noantialiasWhether to use antialiasing.
--arguments=argsStart ghostscrip with additional options as specified by the string args.
--center, --nocenterWhether the page should be centered automatically.
--dsc, --nodscDetermines if document structuring convention (DSC)
comments should be respected or ignored. If --nodsc is used gv
will not attempt to examine the structure of the document but will
pass the file to the ghostscript interpreter as a whole. In this case no
page numbers are shown and freely moving around in the document is not
possible. This option may help when viewing files not conforming to
the document structuring conventions.
--eof, --noeofDefines the behaviour of the postscript scanner used to examine the
structure of the document. If --noeof is used the scanner will
ignore end of file (EOF) comments. This may help when
viewing documents which import other documents without enclosing them
within the proper "BeginDocument" and "EndDocument" comments. If
--eof is used, the scanner treats an EOF comment as
marking the end of the file.
--fullscreenSelects the fullscreen mode.
--infoSilentDo not show any ghostscript messages in an info popup window.
--infoErrorsOnly show error messages from ghostscript in an info popup window.
--infoAllShows all ghostscript messages in an info popup window.
--pixmap, --nopixmapIf --pixmap is used gv tries to maintain off-screen regions of
the displayed page by allocating a sufficiently large pixmap. If
--nopixmap is used the X Server is responsible for
maintaining obscured portions of the displayed page (see also the
useBackingPixmap resource).
--versionPrint the version number of gv to standard output and exit.
--help, --usageDisplay a short help message and exit.
--scale=nn must be an integer or a positive float.
In case n is an integer, n selects the scale entry n relative to the scale 1.0.
With the special value of -1000 Fit to page is selected, and likewise with the
value of -1001 Fit widthto page is selected.
In case n is a float, n selects an arbitrary scale.
--scalebase nSelects the scale base n.
--monochrome, --grayscale, --colorSets the color palette to be used.
--media=mediaSelects the paper size to be used. Valid values are names of paper sizes that appear in the list of page medias as given by the medias resource.
--page=labelDisplay the page with label label first.
--orientation=orientationSets the orientation.
Valid values for orientation are portrait,
landscape, seascape and upsidedown.
--quiet, --noquietWhether to start ghostscript with the -dQUIET option.
--resize, --noresizeWhether ghostscrip is allowed to automatically fit the size of its window to the size of the displayed page.
--password=PASSWORDWhen opening a file, use PASSWORD to decrypt it. This Option is usefull for viewing encrypted PDF files.
--presentationIs actually a shortcut for --fullscreen --noresize --scale=-1000 --widgetless.
--safer, --nosaferWhether to start ghostscript in safer mode
(that includes he -dSAFER option or the -dDELAYSAFER
mode where appropriate) and the -P- option.
--safedir, --nosafedirWhether to start ghostscript from a safe direcotry or not.
--spartanThis is a shortcut for --style=gv_spartan.dat.
--style=fileRead and use additional resources from the file file.
These resources have lower priority than those provided
in the context of the --ad option.
--swap, --noswapWhether to interchange the meaning of the orientations landscape and seascape.
--watch, --nowatchThe --watch option causes gv to check the document
periodically. If changes are detected gv will
automatically display the newer version of the file.
The document is by default checked once every second.
This can be changed via the watchFileFrequency resource.
Note that sending gv the SIGHUP signal also causes
an update of the displayed document. This method
may be used by document creators to trigger gv
remotely.
--widgetlessThis is a shortcut for --style=gv_widgetless.dat.
Next: Mouse and key bindings, Previous: Invoking gv, Up: Top [Contents][Index]
| • Resource files: | ||
| • Resources of gv: |
Next: Resources of gv, Previous: Resources, Up: Resources [Contents][Index]
In general gv does not depend on any external resource files. However, when starting gv, preferences are read from
The name of this file is GV and is installed on as part of gv’s architecture independent library. Usually the library files are installed on /usr/local/lib/gv.
Administrators may want to modify this file in order to set up gv according to the local needs of their system.
The name of this file is either ~/.gv or as described
by the XUSERFILESEARCHPATH environment variable.
The files gv_user.ad and gv_system.ad (located in the library directory of gv, which is most probably either /usr/local/lib/gv/ or /usr/lib/gv/) may serve as a basis for constructing the user and system specific resource files.
Note that the user and system specific resource files are not the only sources of preferences taken into account when gv is started. However, in practice these are the most important.
Previous: Resource files, Up: Resources [Contents][Index]
The following describes some of the resources of gv. The precise syntax of some of the resource values may be inferred from the appended default system specific resource file.
Whether antialiasing should be used.
Valid values are True and False.
It defaults to True.
Whether the displayed page should automatically be centered
(for instance when opening a new file).
Valid values are True and False.
It defaults to True.
Whether gv is allowed to resize the main window
according to the size of the current page.
Valid values are True and False.
It defaults to True.
Whether printing requires an extra confirmation.
Valid values are True and False.
It defaults to True.
Whether leaving gv requires extra confirmation.
Valid values are 0 (Never), 1
(When processing) and 2 (Always).
The default value is 1, which causes
a confirmation request when trying to leave gv
in the presence of pending PDF to Postscript conversions.
If this resource is True scrolling via the
keyboard causes a temporary border to be drawn around the
previously visible area of the page.
Allowed values are True and False.
It defaults to True.
Defines the behavior of the info popup which shows messages from ghostscript. Valid values are Silent (Never), Errors
(show only errror messages) and All (Any message is being shown).
It defaults to Errors.
Defines whether the display resolution is determined by xinerama. Valid values are On (use
Xinerama if available), Off (do not use Xinerama) and Auto
(heuristically decide whether to use Xinerama or not).
It defaults to Auto.
Defines the behaviour of the postscript scanner as described
in the Options section.
Valid values are True and False.
It defaults to True.
Determines whether gv should attempt to respect document
structuring comments.
Valid values are True and False.
It defaults to True.
Defines the interpretation of directions when
scrolling with the mouse.
Valid values are True and False.
It defaults to False.
Whether the meaning of landscape and seacape
should be interchanged.
Valid values are True and False.
It defaults to False.
Specifies a directory used to store temporary data.
It defaults to the invocation directory.
Specifies the default destination directory for files to be saved.
It defaults to the home directory, ~/.
If the value of this resource is False the X Server
is advised that saving off-screen pixels of the displayed page
would be beneficial (maintaining backing store). In this case gv
does not actively maintain the contents of the page but relies
on the X Server. The server is, however, always free to stop
maintaining backing backing store.
If the value of this resource is True the X Server
is advised that maintaining backing store is not useful.
In this case gv attempts to allocate a sufficiently large pixmap
to store the contents of the displayed page.
It defaults to True.
Whether the document should be checked periodically and updated
automatically if changes are detected.
Valid values are True and False.
It defaults to False.
Defines the time in milliseconds elapsing between successive
checks of the document when watchFile is set to True.
Allowed values must be larger than 500.
It defaults to 1000.
The command used for printing a file.
The command may contain multiple %s wildcards
which will be replaced by the name of the file to be
printed.
It defaults to lpr.
This file is used for saving positions by the z and u keys.
It defaults to ~/gv.savepos.
The command used to start the ghostscript interpreter.
It defaults to gv.
The command used to extract document structuring comments from a PDF file.
It defaults to gs -dNODISPLAY -dQUIET -sPDFname=%s -sDSCname=%s pdf2dsc.ps -c quit
The command used to convert a PDF file to PostScript.
It defaults to gs -dNODISPLAY -dQUIET -dNOPAUSE -sPSFile=%s %s -c quit
The ghostscript command line option which activates the X11 device.
It defaults to -sDEVICE=x11
The ghostscript command line option which activates the X11 device with antialiasing enabled.
It defaults to -dNOPLATFONTS -sDEVICE=x11alpha
Determines whether ghostscript should be started from a safe directory.
It defaults to True.
Determines whether ghostscript should be started with the
-dSAFER command line option.
It defaults to True.
Determines whether ghostscript should be started with the
-dQUIET command line option.
It defaults to True.
May be used to provide additional command line options for the
ghostscript interpreter.
Starting gv with the -arguments arguments
option will override this resource setting.
It defaults to the empty string.
Describes the menu that pops up when preparing to to zoom an area of the displayed page.
Defines a list of directories accessible via the Directories
menu in the file selection window.
The special value Home corresponds to the users home directory,
the value Tmp corresponds to the scratch directory as defined
by the scratchDir resource.
It defaults to Home Tmp /usr/doc /usr/local/doc
Defines the default filter to be used when displaying a directory contents in the file selection window. A filter is specified according to the syntax
<filter> := [<filespecs>] [no <filespecs>]
<filespecs> := <filespec> [<filespecs>]
<filespec> := filename possibly including wildcards '*'
which match any character.
Example: The filter
GV*filter: *.ps *.pdf no .*
screens out all files with names starting with a dot and keeps of the remaining ones only those which end on .ps or .pdf.
It defaults to no .*
Defines a list of filters offered in the Filters
menu of the file selection window.
The filter None has a special meaning
causing all files to be displayed when the corresponding
menu entry is selected.
Describes the menu that pops up when clicking with the third mouse button on the displayed page. The value of this resource is a list of menu entries.
Allowed entries are
update
reload
toggle_current
toggle_even
toggle_odd
unmark
stop
print_all
print_marked
save_all
save_marked
line
Whether the name of the displayed document should be shown in the
title bar of the window. The name of gv’s icon will also change
accordingly if this resource is set to True.
If this is 0, no title will be shown.
1 means to show a the document title or the file name if there is
no document title.
Only the file name is shown with 2.
It defaults to 1.
When resizing gv will not attempt to exceed the size specified
by these resources.
These resources may be specified as a positive integer
or as screen, optionally combined with
a positive or negative offset.
The default values listed above provide examples for this syntax.
screen will automatically be replaced by the size of the
screen.
maximumWidth defaults to screen-20.
maximumHeight defaults to screen-44.
Defines a minimum size for the main window. Valid values for both resources are positive integers larger than 200.
minimumWidth defaults to 400.
minimumHeight defaults to 430.
Sets the initial scale. The value of this resource is the offset of the scale to be selected relative to the scale 1.0 in the the Scale menu.
It defaults to 0.
Selects the initial scale base. The value of this resource should be a positive integer.
It defaults to 1.
Defines the available scales bases and scales in the Scale menu.
Sets the initial orientation. Valid values are
portrait
landscape
seascape
upside-down
automatic
automatic causes gv to attempt
to derive the correct orientation from document structuring
comments.
It defaults to automatic.
Defines the paper-size to be used when automatic orientation
detetction fails. Valid values are portrait, landscape,
seascape and upside-down.
It defaults to portrait.
A list describing the page medias known to gv.
List entries starting with ! or # will not appear in the
Media menu but will still be used for automatic paper size
detection.
Sets the paper size.
Allowd values are as given in the above list of paper-sizes.
Specifying
automatic causes gv to attempt
to derive the correct paper-size from document structuring
comments.
It defaults to automatic.
Defines the paper-size to be used when automatic paper-size detetction fails. Valid values are as given in the above list of paper-sizes.
It defaults to a4.
Variuos strings for translating GNU gv.
Next: Comments about the user interface, Previous: Resources, Up: Top [Contents][Index]
Next: Mouse bindings in the File Selection popup, Previous: Mouse and key bindings, Up: Mouse and key bindings [Contents][Index]
The following mouse events are defined when the mouse pointer is either on the displayed page or on a zoomed area:
Scrolls the displayed page ’proportionally’.
Scrolls the displayed page ’absolutely’.
In the main window this displays the previous/next page if the double-click occured in the left/right half of the window. In a zoom window it does nothing.
Pops up a small menu which allows to choose a magnification for a certain area around the current mouse position. After selecting a magnification a zoom window pops up displaying the area at the chosen scale.
This draws and thereby defines a rectangular region which can be displayed in a zoom window. The magnification for the area can be selected by means of a popup menu which appears after releasing button 2.
Reload the current page. This event sequence works only in the main window.
Pops up a small menu which offers a few standard actions like ’Reload’, ’Mark Page’, etc.
Next: Mouse bindings in the Table of Contents, Previous: Mouse bindings in the Main and the Zoom window, Up: Mouse and key bindings [Contents][Index]
The following mouse events are defined when the mouse pointer is in the window of either a file or a directory list:
Scrolls a file or directory list ’proportionally’.
Scrolls a file or directory list ’absolutely’.
Scrolls a file or directory list one page up/down if the button was pressed in the upper/lower half of the list.
Selects the file and closes the File Selection popup.
Causes the contents of this directory to be displayed.
Next: Mouse bindings in the Panner widget, Previous: Mouse bindings in the File Selection popup, Up: Mouse and key bindings [Contents][Index]
The following mouse events are defined when the mouse pointer is in the window showing a list of page numbers of the current file (table of contents):
Scrolls the table of contents.
Go to this page.
Mark this page if it is unmarked, but unmark it if it is marked.
Marks/unmarks all unmarked/marked pages in the region crossed by the mouse pointer during the movement.
Next: Mouse bindings in the << and >> button windows, Previous: Mouse bindings in the Table of Contents, Up: Mouse and key bindings [Contents][Index]
The Panner widget is the rectangular region located close to the left edge of the main window. It indicates the size and the position of the visible area of the current page relative to the total page.
The following mouse events are defined when the mouse pointer is in this region:
Scrolls the displayed page.
Display the previous page.
Display the next page.
Next: Key Bindings, Previous: Mouse bindings in the Panner widget, Up: Mouse and key bindings [Contents][Index]
The << and >> buttons are used to move to another page. The following mouse events are defined:
Move 1 page forward/backwards.
Move 5 pages forward/backwards.
Move 10 pages forward/backwards.
Previous: Mouse bindings in the << and >> button windows, Up: Mouse and key bindings [Contents][Index]
The following key events are defined in the main window. Those bindings scrolling the page are also defined in zoom popups.
| • Notation: | ||
| • Miscellaneous keys: | ||
| • Orientation: | ||
| • Magnification: | ||
| • Navigating: |
Next: Miscellaneous keys, Previous: Key Bindings, Up: Key Bindings [Contents][Index]
means press Shift and key X
means press Ctrl and key X
means press Shift or Ctrl and key X
Next: Orientation, Previous: Notation, Up: Key Bindings [Contents][Index]
Toggle antialiasing on and off
Open a new file
Quit gv
Toggle gv’s resizing behaviour
Respect/Ignore document structuring
Watch file / Don’t watch file
Save the marked pages
Save the current file
Print the marked pages
Print the current file
Switches to presentation mode by forking a new GNU gv process.
Reload the current page
Reload the current page
Reopen the current file
Mark the current page
Unmark the current page
append the current coordinate to a file whose name is given by the GV.saveposFilename resource.
enter a command with the current coordinate as its default parameter. By defalt it is
% TODO
\PutAtPos(x,y)(), where x,y are the current coordinate and the user can put needed commands into ().
This command is appended to a file whose name is given by the GV.saveposFilename resource.
Next: Magnification, Previous: Miscellaneous keys, Up: Key Bindings [Contents][Index]
Orientation portrait
Orientation landscape
Orientation upside-down
Orientation seascape
Next: Navigating, Previous: Orientation, Up: Key Bindings [Contents][Index]
Select the scale entry -6 relative to the scale 1.0
Select the scale entry -5 relative to the scale 1.0
Select the scale entry -4 relative to the scale 1.0
Select the scale entry -3 relative to the scale 1.0
Select the scale entry -2 relative to the scale 1.0
Select the scale entry -1 relative to the scale 1.0
Select the scale 1.0 (for german keyboard layout)
Select the scale 1.0
Select the scale entry 1 relative to the scale 1.0
Select the scale entry 2 relative to the scale 1.0
Select the scale entry 3 relative to the scale 1.0
Select the scale entry 4 relative to the scale 1.0
Select the scale entry 5 relative to the scale 1.0
Select the scale entry 6 relative to the scale 1.0
Select the next scale entry
Select the next scale entry
Select the previous scale entry
Previous: Magnification, Up: Key Bindings [Contents][Index]
Scroll in the direction of the arrow
Scroll columns up or jump -1 pages
Scroll columns down or jump 1 pages
Scroll rows left or jump -1 pages
Scroll rows right or jump 1 pages
Jump -1 pages (to top/left corner)
Jump 1 pages (to top/left corner)
Jump -5 pages (to top/left corner)
Jump 5 pages (to top/left corner)
Identical to arrow up
Identical to arrow down
Identical to arrow left
Identical to arrow left
Identical to arrow right
Center the page
Scroll columns up or jump -1 pages
Scroll columns down or jump 1 pages
Scroll columns up or jump -1 pages
Jump -5 pages
Jump 5 pages
Go to the first page
Go to the last page
Jump -1 pages
Jump 1 pages
Highlight a page number
Highlight previous page number
Highlight next page number
Jump to the highlighted page
Scroll columns up
Scroll columns up
Scroll columns down
Jump -1 pages
Jump 1 pages
Next: Frequently asked questions, Previous: Mouse and key bindings, Up: Top [Contents][Index]
| • Scales: | ||
| • Scrolling: | ||
| • Displaying new versions of a document: |
Next: Scrolling, Previous: Comments about the user interface, Up: Comments about the user interface [Contents][Index]
The Scale menu which allows to view the document at different sizes is divided into two parts. The first part shows a list of available scale bases, the second part, separated by a line, lists the relative scales which are applied with respect to the selected scale base.
By default two scales bases are available, the Natural size and the Pixel based base. When choosing the Pixel based scale base a relative scale of 1.0 causes one postscript point to correspond to one pixel on the screen.
When viewing a document at a relative scale of 1.0 using the Natural size base the page should appear in its real size, as if printed on paper. For the Natural size base to work properly gv has to know the correct size of the root window. Automatic detection of this size unfortunately only provides approximate results, therefore it is best if it is provided by the user. To do so the resource
GV.screenSize: <width> x <height>
should be added to the SCREEN_RESOURCES property of the screen
the document is viewed on, with width and height
describing the width and height of the root window in units of millimeters.
For instance by using the command
echo "GV.screenSize: 396 x 291" | xrdb -override -screen
a width of 346 mm and a height of 291 mm will be used for the Natural size scale base. Alternatively the resource
GV.screenSize_<machine>_<disp>_<scr>: <width> x <height>
may be added to a resource file read by gv. Here
machine ,disp and ANGLED describe
the display on which gv displays the document.
For instance, if the display is set to tic.tac.toe.wo:0.1
the resource should be specified as
GV.screenSize_tic_0_1: 396 x 291
Note that this method doesn’t work on VMS. As a last alternative the resource
GV.screenSize: <width> x <height>
may be added to one of the resource files. However, for obvious reasons this method should be used only on single user machines.
Next: Displaying new versions of a document, Previous: Scales, Up: Comments about the user interface [Contents][Index]
It is probably a de facto standard for user interfaces that windows are supposed to be scrolled by means of scrollbars attached to their sides. However, for various reasons the use of scrollbars has been minimized in gv.
Instead, in all windows with obscured data, scrolling may be performed by
pressing button1, moving the mouse, then releasing button1
directly in the window. This includes the displayed page, zoom popups, the table of contents and the file and directory lists displayed in the file selection popup.
Previous: Scrolling, Up: Comments about the user interface [Contents][Index]
During document creation it is usually desirable to always display the newest version of the document in work.
Instead of explicitly loading it via the file selection popup the most recent version can be displayed by pressing the Reload button in the main window. Choosing the Reload entry in the menu that pops up when clicking with the third mouse button anywhere on the displayed page certainly has the same effect.
More comfortable is the "Watch File" feature which may be switched on by selecting the corresponding entry in the State menu. If activated gv will check every now and then if a new version of the displayed file exists. If so it will be displayed automatically. By default the file is checked about once every second.
Finally it may also be left to the document creating program to trigger gv to update its display. To do so the program should send the SIGHUP signal to gv. For instance at the end of a shell script generating a postscript file from latex sources the line
kill -SIGHUP <gv_pid>
may be added (here gv_pid is the process id of gv). Executing the script and thereby creating a new version of the document will then also cause the result to be displayed instantaneously. Please note that this feature is available only on X11 R6 based systems.
Next: gv internals, Previous: Comments about the user interface, Up: Top [Contents][Index]
| • What happened to the scroll bars?: | ||
| • How can I make even more room for the image?: | ||
| • Small characters are not very clear: | ||
| • The output is not refreshed automatically: |
Next: How can I make even more room for the image?, Previous: Frequently asked questions, Up: Frequently asked questions [Contents][Index]
They have been removed in order to make more room for the image. The displayed portion of the image may be moved by dragging the image or the paner (panel between the "Save Marked" and << >> buttons) with the mouse. Alternatively, the cursor arrow keys can be used.
Next: Small characters are not very clear, Previous: What happened to the scroll bars?, Up: Frequently asked questions [Contents][Index]
Use the "spartan" style by starting gv with the command
gv --spartan
This removes the "Open", "Print", "Save", "Reload", and page marking buttons (they are still available from the "File" and "Page" menus) and replaces them with the document attribute controls, which are normally along the top.
Next: The output is not refreshed automatically, Previous: How can I make even more room for the image?, Up: Frequently asked questions [Contents][Index]
Antialiasing can improve the display of bitmapped fonts (eg. from TeX) when displayed on a colour or greyscale screen. The same technique is used by xdvi. Note that antialiasing requires at least Ghostscript version 4.x.
Antialiasing can be turned on from the "State" menu, and can be made
default by saving the setting in State | gv Options....
Previous: Small characters are not very clear, Up: Frequently asked questions [Contents][Index]
There are two methods that can be used to save the contents of the window when it’s not currently displayed: backing store and backing pixmap. Some X-servers seem to support only backing store (eg. VAXstations) and some only backing pixmap (eg. some X-terminals, including EWS).
In order to force gv to use one method or the other, use the
State | Setup Options ... menu and toggle the "Backing Pixmap" button.
When selected/highlighted (normally the default), gv will use backing
pixmap; otherwise it will use backing store. Select "Apply" to use a new
setting and "Save" to make it the new default.
Next: GNU General Public License, Previous: Frequently asked questions, Up: Top [Contents][Index]
| • Interface with ghostscript: | ||
| • Comments recognized by ghostview: | ||
| • Paper Keywords and paper size in points: |
Next: Comments recognized by ghostview, Previous: gv internals, Up: gv internals [Contents][Index]
| • Ghostview interface to ghostscript: | ||
| • Drawing on a Window: | ||
| • Drawing on a Pixmap: | ||
| • The GHOSTVIEW environment variable: | ||
| • The GHOSTVIEW property: | ||
| • Events from ghostscript: |
Next: Drawing on a Window, Previous: Interface with ghostscript, Up: Interface with ghostscript [Contents][Index]
When the GHOSTVIEW environment variable is set, ghostscript
draws on an existing drawable rather than creating its own window.
Ghostscript can be directed to draw on either a window or a pixmap.
Next: Drawing on a Pixmap, Previous: Ghostview interface to ghostscript, Up: Interface with ghostscript [Contents][Index]
The GHOSTVIEW environment variable contains the window id of
the target window. The window id is an integer. Ghostscript will use
the attributes of the window to obtain the width, height, colormap,
screen, and visual of the window. The remainder of the information is
gotten from the GHOSTVIEW property on that window.
Next: The GHOSTVIEW environment variable, Previous: Drawing on a Window, Up: Interface with ghostscript [Contents][Index]
The GHOSTVIEW environment variable contains a window id and a pixmap id. They are integers separated by white space. Ghostscript will use the attributes of the window to obtain the colormap, screen, and visual to use. The width and height will be obtained from the pixmap. The remainder of the information, is gotten from the GHOSTVIEW property on the window. In this case, the property is deleted when read.
Next: The GHOSTVIEW property, Previous: Drawing on a Pixmap, Up: Interface with ghostscript [Contents][Index]
window-id [pixmap-id]
"%d %d"
Explanation of parameters:
window-idtells ghostscript where to
If pixmap-id is not present, ghostscript will draw on this window.
pixmap-idIf present, tells ghostscript that a pixmap will be used as the final destination for drawing. The window will not be touched for drawing purposes.
Next: Events from ghostscript, Previous: The GHOSTVIEW environment variable, Up: Interface with ghostscript [Contents][Index]
STRING
bpixmap orient llx lly urx ury xdpi ydpi [left bottom top right]
"%d %d %d %d %d %d %f %f %d %d %d %d"
Explanation of parameters:
pixmappixmap id of the backing pixmap for the window. If no pixmap is to be used, this parameter should be zero. This parameter must be zero when drawing on a pixmap.
orientorientation of the page. The number represents clockwise rotation of the paper in degrees. Permitted values are 0, 90, 180, 270.
llx, lly, urx, uryBounding box of the drawable. The bounding box is specified in PostScript points in default user coordinates.
xdpi, ydpiResolution of window. (This can be derived from the other parameters, but not without roundoff error. These values are included to avoid this error.)
left, bottom, top, right (optional)Margins around the window. The margins extend the imageable area beyond the boundaries of the window. This is primarily used for popup zoom windows. I have encountered several instances of PostScript programs that position themselves with respect to the imageable area. The margins are specified in PostScript points. If omitted, the margins are assumed to be 0.
Previous: The GHOSTVIEW property, Up: Interface with ghostscript [Contents][Index]
If the final destination is a pixmap, the client will get a property notify event when ghostscript reads the GHOSTVIEW property causing it to be deleted.
Ghostscript sends events to the window where it read the GHOSTVIEW property. These events are of type ClientMessage. The message_type is set to either PAGE or DONE. The first long data value gives the window to be used to send replies to ghostscript. The second long data value gives the primary drawable. If rendering to a pixmap, it is the primary drawable. If rendering to a window, the backing pixmap is the primary drawable. If no backing pixmap is employed, then the window is the primary drawable. This field is necessary to distinguish multiple ghostscripts rendering to separate pixmaps where the GHOSTVIEW property was placed on the same window.
The PAGE message indicates that a "page" has completed. Ghostscript will wait until it receives a ClientMessage whose message_type is NEXT before continuing.
The DONE message indicates that ghostscript has finished processing.
Next: Paper Keywords and paper size in points, Previous: Interface with ghostscript, Up: gv internals [Contents][Index]
%!PS-Adobe-<real> [EPSF-<real>] %%BoundingBox: <int> <int> <int> <int>|(atend) %%CreationDate: <textline> %%Orientation: Portrait|Landscape|(atend) %%Pages: <uint>|(atend) %%PageOrder: Ascend|Descend|Special|(atend) %%Title: <textline> %%DocumentMedia: <text> <real> <real> <real> <text> <text> %%DocumentPageSizes: <text> %%EndComments
Preview section:
%%BeginPreview %%EndPreview
Defaults section:
%%BeginDefaults %%PageBoundingBox: <int> <int> <int> <int>|(atend) %%PageOrientation: Portrait|Landscape %%PageMedia: <text> %%EndDefaults
Prolog section:
%%BeginProlog %%EndProlog
Setup section:
%%BeginSetup %%PageBoundingBox: <int> <int> <int> <int>|(atend) %%PageOrientation: Portrait|Landscape %%PaperSize: <text> %%EndSetup
Page properties:
%%Page: <text> <uint> %%PageBoundingBox: <int> <int> <int> <int>|(atend) %%PageOrientation: Portrait|Landscape %%PageMedia: <text> %%PaperSize: <text>
%%Trailer %%EOF
Document section:
%%BeginDocument: <text> [<real>[<text>]] %%EndDocument
Binary section:
%%BeginBinary: <uint> %%EndBinary
Data section:
%%BeginData: <uint> [Hex|Binary|ASCII[Bytes|Lines]] %%EndData
Previous: Comments recognized by ghostview, Up: gv internals [Contents][Index]
Letter 612x792 LetterSmall 612x792 Tabloid 792x1224 Ledger 1224x792 Legal 612x1008 Statement 396x612 Executive 540x720 A0 2384x3371 A1 1685x2384 A2 1190x1684 A3 842x1190 A4 595x842 A4Small 595x842 A5 420x595 B4 729x1032 B5 516x729 Envelope ???x??? Folio 612x936 Quarto 610x780 10x14 720x1008
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