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125 lines
3.8 KiB
HTML
125 lines
3.8 KiB
HTML
<!doctype HTML public "-//W3O//DTD W3 HTML 2.0//EN">
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<HTML>
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<HEAD>
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<TITLE>gifcompose</TITLE>
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<link rev=made href=mailto:esr@snark.thyrsus.com>
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</HEAD>
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<BODY>
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Go to <a href="index.html">index page</a>.
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<CENTER><H1>gifcompose</H1></CENTER>
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The gifcompose program uses the GIFLIB utility tools to support a minilanguage
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for describing GIF pasteup sequences.<P>
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<H1>Usage:</H1>
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<pre>
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gifcompose [-v] <specfile
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</pre>
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<H1>Specification Syntax</H1>
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The gifcompose tool takes a series of text lines and interprets them as
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commands to do pasteup operations. The commands are:<P>
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<CENTER><H2>Generators</H2></CENTER>
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<DL>
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<DT><CODE>gif <name></CODE><DD>
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Paste in <name>.gif<P>
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<DT><CODE>raw <name> <width> <height></CODE><DD>
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Paste in the given raw-format file (no suffix supplied). Raw format
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is a stream of 8-bit indices into the EGA color map. Accordingly, the
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width and height must be specified, and the source must be exactly
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width times height bytes long.<P>
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<DT><CODE>rgb <name> <width> <height></CODE><DD>
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Paste in the given RGB-format file (no suffix supplied). Raw format
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is a stream of 24-bit color values. Accordingly, the width and height
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must be specified, and the source must be exactly 3 times width times
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height bytes long.<P>
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<DT><CODE>rle <name></CODE><DD>
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Paste in the given RLE-format file (no suffix supplied). This converts
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the Utah Raster Kit format to GIF.<P>
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<DT><CODE>text <text> [foreground <index>] [color <r> <g> <b>]</CODE><DD>
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Copy 8x8 monospace font, with transparent background and index 1 as
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foreground. If the text string contains whitespaces, they must be
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escaped or the string must be quoted (shell conventions).<P>
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The optional suffix `foreground <n>' sets the foreground color index.
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The optional suffix `color <r> <g> <b>' sets the RGB color to be used
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for the foreground index.<P>
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</DL>
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Each generator operation may be followed by any combination of the
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following suffixes:
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<CENTER><H2>Modifiers</H2></CENTER>
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<DT><CODE>at <x> <y></CODE><DD>
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Place the image at the given (upper-left-hand-corner) coordinates
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in the pasted-up result.<P>
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<DT><CODE>clip <name> <top-x> <top-y> <bottom-x> <bottom-y></CODE><DD>
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Clip image using the given rectange, paste it onto.<P>
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<DT><CODE>xflip</CODE><DD>
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Flip the image around the X axis before placing it.<P>
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<DT><CODE>yflip</CODE><DD>
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Flip the image around the Y axis before placing it.<P>
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<DT><CODE>left</CODE><DD>
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Rotate the image 90 degrees counterclockwise before placing it.<P>
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<DT><CODE>right</CODE><DD>
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Rotate the image 90 degrees clockwise before placing it.<P>
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<CENTER><H2>Target Operations</H2></CENTER>
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<DT><CODE>screen size <x-size> <y-size></CODE><DD>
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Set the global screen size of the final image.<P>
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<DT><CODE>screen position <x> <y></CODE><DD>
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Set the global screen position of the final image.<P>
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<CENTER><H2>Comments</H2></CENTER>
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Comments or comment lines may be preceded with `#' and will be ignored.<P>
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<H1>Memory required:</H1>
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Proportional to the size of the largest pasted image.<P>
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<H1>Options:</H1>
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<DL>
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<DT> [-v]
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<DD> Emit a report on each composition action to stderr as it happens.
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</DL>
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<H1>Bugs:</H1>
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The suffix sequence `left left' sometimes mysteriously fails to work,
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probably due to some restriction in <a href="gifflip.html">gifflip</a>.<P>
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No support for resizing or odd-angle rotations yet.<P>
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The `color' suffix of text is a no-op, because the present version of
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<a href="gifovly.html">gifovly</a> throws away color tables.<P>
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Error checking is rudimentary.<P>
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<H1>Author:</H1>
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Eric S. Raymond <esr@snark.thyrsus.com>
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<HR>
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<ADDRESS>Eric S. Raymond <A HREF="mailto:esr@thyrsus.com"><esr@snark.thyrsus.com></A></ADDRESS>
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</BODY>
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</HTML>
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