changelog

一个利用SDL语言来实现svgalib函数的示例程序

2005-01-28  Russell Marks  <[e-mail]>

	* Version 5.9.

	* src/rcfile.c (usage_help): changed `fullscreen' option's default
	to on, so you now have to use `--fullscreen=off' (or similar
	config file option) to disable it. This keeps the SDL backend's
	behaviour closer to the svgalib one.

2005-01-23  Russell Marks  <[e-mail]>

	* src/readgif.c (read_gif_file): made the width/height check
	for multi-image (animated) GIFs a bit less harsh, it was
	previously refusing to view animations with a particularly
	large `screen size'. Now it should allow anything where the
	individual images are smaller than 4MB once loaded (that's as
	generous as I can be while keeping the maths easy :-)).

2005-01-20  Russell Marks  <[e-mail]>

	* Added SDL mouse support, and modified mouse support to work in a
	delta-based way friendier to non-svgalib backends. Thanks to
	Dimitar Zhekov for both of these.

2005-01-05  Russell Marks  <[e-mail]>

	* src/readgif.c (read_gif_multi): the height-limiting changes
	exposed a long-standing bug with `im->image' in this. Thanks to
	Mikulas Patocka for the fix.

2004-12-17  Russell Marks  <[e-mail]>

	* src/readpnm.c (read_pnm_main): fixed possible hang when reading
	corrupted non-raw PBM files.

	* src/readgif.c (readimagehed): fixed possible hang when reading
	GIF files with corrupted ext. blocks. Thanks to Mikulas Patocka
	for finding this.

2004-12-16  Russell Marks  <[e-mail]>

	* src/zgv_io.c (zgv_io_timer_stop): fixed a timer-related bug with
	the SDL version, where it could leave the timer-interrupt flag on
	after the timer was disabled. Thanks to Dimitar Zhekov for
	spotting this one.

2004-11-02  Russell Marks  <[e-mail]>

	* doc/zgv.texi (Invoking zgv): fixed "walk" typo.
	(Showing More Files): 20 thumbnails are shown by default, not 12.

2004-10-31  Russell Marks  <[e-mail]>

	* Added width/height limits to all picture readers,
	32767x32765 is now the maximum image size supported
	(essentially consistent with xzgv). This is a crude (albeit
	effective) fix for heap overflow bugs - there may yet be more
	subtle problems, but I can't really fix them until I know
	they're there. :-) Thanks to Luke Macken for letting me know
	about the heap overflow problems. I suppose I should also
	thank "infamous41md" for publishing the original
	advisory/exploit, even if he didn't bother emailing me or
	anything.

	* src/readxpm.c (read_xpm_file): fix for exploitable malloc() arg
	overflow. There are several more of these in zgv, but this is the
	easiest to fix.

2004-07-08  Russell Marks  <[e-mail]>

	* src/readgif.c (read_gif_file): added more multiple-image (e.g.
	animated) GIF brokenness checks than before. Previously it was
	possible to get a segfault with the `right' file, despite there
	already being various range checks. Thanks to Mikulas Patocka for
	spotting this.

2004-03-29  Russell Marks  <[e-mail]>

	* Version 5.8.

	* src/zgv_io.c (zgv_io_fixfsmode): the SDL backend is now a lot
	more sensible about automatically picking a file selector mode,
	and should have a better chance of working when using a
	single-mode VESA framebuffer. Thanks to David Matthews for
	indirectly spotting this problem.

	* src/zgv_io.c (zvga_init): the SDL backend will now only ever use
	SDL's emulation for 8-bit modes. This should improve picture
	quality when only 8-bit modes are available, and make all modes
	other than 24/32-bit quite a bit faster. Thanks to David Matthews
	for inspiring this change.

	* src/vgadisp.c: changed 15/16-bit dithering - instead of using a
	rather poor dither pattern in an attempt to use up every last
	`extra' bit of colour information, it now uses 2 bits from each
	channel in a much nicer (and smaller) pattern.

	* INSTALL: added comment on stdout problem with FreeBSD, which
	seems to affect the current svgalib 1.4.3 port at least.

2004-02-21  Russell Marks  <[e-mail]>

	* Added FreeBSD support, thanks to Radim Kolar for contributing
	this. The changes involved aren't too big really, `just' different
	key-reading and console-allocating routines.

	* config.mk (RCFILE): default location for zgv.conf is now
	/usr/local/etc rather than /etc, which seems more appropriate
	given that the default PREFIX is now /usr/local.

2004-01-05  Russell Marks  <[e-mail]>

	* src/vgadisp.c: added support for dithering in 15/16-bit modes.
	It's slower than I'd hoped, so it's not enabled by default, but it
	seems to work well enough. You can toggle it in the viewer by
	pressing `F', or add `dither-hicol on' to a config file. Thanks to
	Stephane ODUL for suggesting this.

	* src/vgadisp.c: moved `fake-cols' toggle key from `F' to `G'.

2003-10-20  Russell Marks  <[e-mail]>

	* src/bdf2h.c (main): removed embedded LFs. Thanks to Dimitar
	Zhekov for the patch.

2003-10-04  Russell Marks  <[e-mail]>

	* Added `fullscreen' option, to override possible use of a
	windowed display with non-svgalib backends in some situations, the
	obvious example being the SDL backend running under X. This isn't
	necessarily what you'd want, and has problems like not being able
	to fill the screen in modes it doesn't support natively under
	svgalib. And SDL seems to cause further problems from what I've
	seen, e.g. display glitching and a briefly-visible mouse pointer
	when changing modes fullscreen under X.

	* src/zgv_io.c (zvga_setmode): fixed missing-picture-update bug
	when doing certain mode changes under SDL.

	* config.mk (PREFIX): finally changed this to /usr/local. `make
	install' now removes any existing program and documentation in the
	old default locations.

	* src/vgadisp.c (animate_gif): `x' now aborts GIF animation like
	Esc does. Thanks to Thomas M. Ott for pointing out the
	inconsistency. Note that I don't consider supporting this slightly
	pointless alternative to Esc to be terribly important (e.g.
	dialogs don't support it and never have, and they've been in zgv
	since 1993), and couldn't add it everywhere even if I wanted to
	(e.g. change-to-arbitrary-directory dialog).

	* src/zgv_io.c: added timer start/stop to backend code, so now
	timer-based stuff (most notably GIF animation) works ok under
	SDL. While doing this I removed support for a repeat-timer
	setting of "-1" (i.e. constantly reload the image), which had
	been broken previously anyway.

2003-09-16  Russell Marks  <[e-mail]>

	* src/vgadisp.c (redrawgif): fixed long-standing bug with
	interpolation (fix ported from xzgv). In xzgv the bug could have
	caused segfaults, but I don't believe this was the case in zgv due
	to the way it allocates memory.

2003-07-31  Russell Marks  <[e-mail]>

	* src/zgv_io.c: added SDL getbox routine, fixing one of the
	display glitches (dialogs not restoring previous screen contents).
	Also stopped the putbox routine using memcpy(), as you're not
	supposed to make library calls when an SDL surface is locked.
	(native_col_to_sdl): fixed colour glitches in dialogs.

2003-07-07  Russell Marks  <[e-mail]>

	* Version 5.7.

	* src/readpng.c (read_png_file): don't set background colour
	to black for mono PNG files, where this may cause problems.
	Thanks to Morten Bo Johansen for spotting this.

2003-06-30  Russell Marks  <[e-mail]>

	* New `--auto-mode-fit-diff' option, allows you to specify a pixel
	width/height to be disregarded when zgv picks a mode to use and
	auto-mode-fit is enabled. So e.g. a 330x250 image would be shown
	in 320x240 mode if auto-mode-fit-diff is 10. Thanks to Dimitar
	Zhekov for this.

	* src/mousecur.c: fixed mouse cursor appearance in 32-bit modes.
	Thanks to Dimitar Zhekov for the patch.

2003-04-10  Russell Marks  <[e-mail]>

	* src/rcfile.c (usage_help): similar changes to usage help.

	* doc/zgv.texi: restored documentation for `-r', `-s', and `-w'
	options, which was mistakenly dropped when I added long-option
	support.

2003-04-05  Russell Marks  <[e-mail]>

	* Added support for display backends other than svgalib,
	largely done by defining the svgalib functions used when
	svgalib isn't the backend. These are clearly never going to be
	*better* than the svgalib backend, as zgv was written for that
	- but if svgalib isn't available or whatever, at least this
	gives you the possibility of running zgv some other way.
	Currently the only other backend is for SDL - it works (albeit
	with some display glitches), but it's intended mainly as a
	proof-of-concept. Though it does give you the faintly ironic
	choice of whether to use xzgv or X zgv... :-)

	* doc/makeman.awk: fixed some bugs which became apparent when run
	with gawk 3.1.

2003-03-15  Russell Marks  <[e-mail]>

	* src/readgif.c (decompress): removed similar comment, which was
	wrong anyway since outputstring() hasn't been recursive for a year
	or two now.

	* src/vgadisp.c: removed silly, dated comments about slowness of
	passing some things as parameters. It was true in 1993 to some
	extent, but certainly not now. Thanks to "Mitchell" for
	questioning this.

2002-07-02  Russell Marks  <[e-mail]>

	* doc/zgv.texi (Invoking zgv): added mention of selector mode
	being forced to 8-bit in documentation for `--fs-start-mode'.
	(Config Variables): fixed severe thinko (mode-bad where I meant
	mode-good) in documentation for mode-all-bad. :-)

	* src/rcfile.c (modematch): fixed to allow 32-bit modes, which
	previously couldn't be specified on the command-line. Thanks to
	"kscott" for spotting this one.

2002-05-05  Russell Marks  <[e-mail]>

	* Version 5.6.

	* src/modesel.c: added 15/16/24/32-bit 320x240 modes. Thanks to
	Michal Svec for suggesting this. Currently only the 24/32-bit mode
	is selectable directly (using `^', on the assumption that it's
	shift-6 - unshifted 6 selects 320x240x8).

2002-04-15  Russell Marks  <[e-mail]>