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