Artifact 7e7643ffd49dce66b7b8292e629ac785a69d4bed:

• File window.c — part of check-in [fd15c23f41] at 2004-10-13 06:50:16 on branch trunk — Re-engineering of terminal emulator, phase 1. The active terminal screen is no longer an array of `unsigned long' encoding 16-bit Unicode plus 16 attribute bits. Now it's an array of `termchar' structures, which currently have 32-bit Unicode and 32 attribute bits but which will probably expand further in future. To prevent bloat of the memory footprint, I've introduced a mostly RLE-like compression scheme for storing scrollback: each line is compressed into a compact (but hard to modify) form when it moves into the term->scrollback tree, and is temporarily decompressed when the user wants to scroll back over it. My initial tests suggest that this compression averages about 1/4 of the previous (32 bits per character cell) data size in typical output, which means this is an improvement even without counting the new ability to extend the information stored in each character cell. Another beneficial side effect is that the insane format in which Unicode was passed to front ends through do_text() has now been rendered sane. Testing is incomplete; this _may_ still have instabilities. Windows and Unix front ends both seem to work as far as I've looked, but I haven't yet looked very hard. The Mac front end I've edited (it seemed obvious how to change it) but I can't compile or test it. As an immediate functional effect, the terminal emulator now supports full 32-bit Unicode to whatever extent the host platform allows it to. For example, if you output a 4-or-more-byte UTF-8 character in Unix pterm, it will not display it properly, but it will correctly paste it back out in a UTF8_STRING selection. Windows is more restricted, sadly. (user: simon size: 127606)

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