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diff --git a/giflib-4.1.6/doc/icon2gif.html b/giflib-4.1.6/doc/icon2gif.html new file mode 100644 index 0000000..a68127e --- /dev/null +++ b/giflib-4.1.6/doc/icon2gif.html @@ -0,0 +1,142 @@ +<!doctype HTML public "-//W3O//DTD W3 HTML 2.0//EN"> +<HTML> +<HEAD> +<TITLE>icon2gif</TITLE> +<link rev=made href=mailto:esr@snark.thyrsus.com> +</HEAD> +<BODY> +Go to <a href="index.html">index page</a>. + +<CENTER><H1>icon2gif</H1></CENTER> + +A program to convert a series of editable text GIF icon specifications and +named GIF files into a multi-image GIF, usable as a graphic resource file. +It can also dump existing GIFs in this format.<P> + +<H1>Usage:</H1> + +<pre> +icon2gif [-q] [-a] [-d] [t TranslationTable] [-h] gif-file... +</pre> + +If no gif-file is given, icon2gif will try to read a text input from stdin.<P> + +<H1>Specification Syntax</H1> + +Here is a syntax summary in informal BNF. The token `NL' represents a +required newline.<P> + +<pre> +<gif-spec> ::= <header-block> <image-block>... + +<header-block> ::= <header-declaration>... + +<header-declaration ::= + | screen width <digits> NL + | screen height <digits> NL + | screen colors <digits> NL + | screen background <digits> NL + | screen map <color-table> NL + +<color-table> ::= <color-declaration>... end NL + +<color-declaration> ::= rgb <digits> <digits> <digits> is <key> NL + +<image-block> ::= include <file-name> NL + | image NL + <image-declaration>... + <raster-picture> + [ <extension> ] + +<image-declarations> ::= image top <digits> NL + | image left <digits> NL + | image interlaced NL + | image map <color-table> NL + | image bits <digits> by <digits> NL <raster-block> + +<extension> := <comment> NL <extension-block> NL end NL + | <plaintext> NL <extension-block> NL end NL + | extension <hex-digits> NL <extension-block> NL end NL +</pre> + +If the semantics of the `screen height', `screen width', `screen background', +`image top', `image left' declarations aren't obvious to you, what are you +doing with this software?<P> + +A color table declares color indices (in ascending order from 0) and +assiciates them with key characters. These characters can later be used in +raster blocks. As these must be printable and non-whitespace, you can only +specify 94 colors per icon. Life is like that sometimes.<P> + +A raster block is just a block of key characters. It should be sized correctly +for the `image bits' declaration that leads it.<P> + +The `comment' or `plaintext' keywords lead defined GIF89 extension +record data (the other two GIF89 types, graphics control and application +block, are not yet supported). You can also say `extension' followed +by a hexadecimal record type. All of these extension declarations +must be followed by an extension block, which is terminated by the +keyword `end' on its own line.<P> + +An extension block is a series of text lines, each interpreted as a string of +bytes to fill an argument block (the terminating newline is stripped). Text +may include standard C-style octal and hex escapes preceded by a backslash.<P> + +All <digits> tokens are interpreted as decimal numerals; <hex-digits> +tokens are interpreted as two hex digits (a byte). All coordinates are +zero-origin with the top left corner (0,0). Range checking is weak and +signedness checking nonexistent; caveat hacker!<P> + +In general, the amount of whitespace and order of declarations within a +header or image block is not significant, except that a raster picture +must immediately follow its `image bits' bits declaration.<P> + +The `include' declaration includes a named GIF as the next image. The global +color maps of included GIFs are merged with the base table defined by any +`screen color' declaration. All images of an included multi-image GIF will +be included in order.<P> + +Comments may be preceded with `#' and will be ignored.<P> + +<H1>Memory required:</H1> + +For the compilation mode, proportional to the size of the input file. For +dumping, proportional to the line size of the widest GIF.<P> + +<H1>Options:</H1> + +<DL> +<DT> [-q] +<DD> Quiet mode. Defaults off on MSDOS, on under UNIX. Controls printout + of running scan lines. Use -q- to invert.<P> + +<DT> [-d] +<DD> Dump the input GIF file(s) into the text form described above.<P> + +<DT> [-t] +<DD> Specify name characters to use when dumping raster blocks. Only + valid with -d option.<P> + +<DT> [-h] +<DD> Print one line of command line help, similar to Usage above.<P> +</DL> + +<H1>Bugs:</H1> + +Because there are only 94 characters unambiguously usable for raster blocks, +an attempt to dump a GIF with a larger color map will fail.<P> + +Error checking is rudimentary.<P> + +<H1>Example:</H1> + +A sample icon file called `sample.ico' is included in the pic directory.<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> |