icon2gif.html
来自「giflib-4.1.6.tar.gz,最新的GIF 解码库」· HTML 代码 · 共 143 行
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<!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 andnamed 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 arequired 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 youdoing with this software?<P>A color table declares color indices (in ascending order from 0) andassiciates them with key characters. These characters can later be used inraster blocks. As these must be printable and non-whitespace, you can onlyspecify 94 colors per icon. Life is like that sometimes.<P>A raster block is just a block of key characters. It should be sized correctlyfor the `image bits' declaration that leads it.<P>The `comment' or `plaintext' keywords lead defined GIF89 extensionrecord data (the other two GIF89 types, graphics control and applicationblock, are not yet supported). You can also say `extension' followedby a hexadecimal record type. All of these extension declarationsmust be followed by an extension block, which is terminated by thekeyword `end' on its own line.<P>An extension block is a series of text lines, each interpreted as a string ofbytes to fill an argument block (the terminating newline is stripped). Textmay 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 arezero-origin with the top left corner (0,0). Range checking is weak andsignedness 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 picturemust immediately follow its `image bits' bits declaration.<P>The `include' declaration includes a named GIF as the next image. The globalcolor maps of included GIFs are merged with the base table defined by any`screen color' declaration. All images of an included multi-image GIF willbe 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. Fordumping, 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>⌨️ 快捷键说明
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