Tiny Stuff - Revision history

Ivo: tn4, tn5, and tn6 are sometimes used as file extension

2008-05-13T19:37:44Z

tn4, tn5, and tn6 are sometimes used as file extension

← Older revision		Revision as of 12:37, 13 May 2008
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	* Company: David Mumper		* Company: David Mumper
	* Extensions: .tny, .tn1, .tn2, .tn3		* Extensions: .tny, .tn1, .tn2, .tn3, .tn4, .tn5, .tn6

	Tiny Stuff is an image compression format used on the [http://en.wikipedia.org/wiki/Atari_ST Atari ST].		Tiny Stuff is an image compression format used on the [http://en.wikipedia.org/wiki/Atari_ST Atari ST].

Ivo: no plainlinks

2008-05-02T00:45:46Z

no plainlinks

← Older revision		Revision as of 17:45, 1 May 2008
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	~~<span class="plainlinks">~~
	* Company: David Mumper		* Company: David Mumper
	* Extensions: .tny, .tn1, .tn2, .tn3		* Extensions: .tny, .tn1, .tn2, .tn3
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	[[Category:Atari ST Image Formats]]		[[Category:Atari ST Image Formats]]
	[[Category:Image Formats]]		[[Category:Image Formats]]
	~~</span>~~

Ivo: category atari st image formats

2008-05-02T00:17:46Z

category atari st image formats

← Older revision		Revision as of 17:17, 1 May 2008
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	Medium and high resolution data are handled as if they were low resolution.		Medium and high resolution data are handled as if they were low resolution.

			[[Category:Atari ST Image Formats]]
	[[Category:Image Formats]]		[[Category:Image Formats]]
	</span>		</span>

Ivo: Tiny stuff moved to Tiny Stuff: upper case S

2008-05-01T12:37:22Z

Tiny stuff moved to Tiny Stuff: upper case S

← Older revision	Revision as of 05:37, 1 May 2008
(No difference)

Ivo: correct error in uncompressed data format

2008-05-01T12:02:45Z

correct error in uncompressed data format

← Older revision		Revision as of 05:02, 1 May 2008
Line 44:		Line 44:

	for (set=0; set<4; set++)		for (set=0; set<4; set++)
	for (column=set; column<80; column++)		for (column=set; column<80; column += 4)
	for (scanline=0; scanline<200; scanline++) { }		for (scanline=0; scanline<200; scanline++) { }

Ivo: add link to m68k assembly decompression routine

2008-05-01T12:01:34Z

add link to m68k assembly decompression routine

← Older revision		Revision as of 05:01, 1 May 2008
Line 4:		Line 4:

	Tiny Stuff is an image compression format used on the [http://en.wikipedia.org/wiki/Atari_ST Atari ST].		Tiny Stuff is an image compression format used on the [http://en.wikipedia.org/wiki/Atari_ST Atari ST].
			Here's the [http://ivop.free.fr/multimediawiki/TINY.S m68k assembly decompression routine] from the original Tiny Stuff 3.0 package.

	16-bit words are stored in big-endian order.		16-bit words are stored in big-endian order.

Ivo: clarify

2008-05-01T11:48:14Z

clarify

← Older revision		Revision as of 04:48, 1 May 2008
Line 17:		Line 17:
	uint8_t animation_dirspeed; /* negative = left, positive = right, timebase 1/60 */		uint8_t animation_dirspeed; /* negative = left, positive = right, timebase 1/60 */
	uint16_t duration; /* number of iterations */		uint16_t duration; /* number of iterations */
	} optional_animation_info;		} optional_animation_info; /* if resolution < 3, this is not present */

	uint16_t palette[16];		uint16_t palette[16];

Ivo: create tiny stuff description

2008-05-01T11:47:13Z

create tiny stuff description

New page

<span class="plainlinks">
* Company: David Mumper
* Extensions: .tny, .tn1, .tn2, .tn3

Tiny Stuff is an image compression format used on the [http://en.wikipedia.org/wiki/Atari_ST Atari ST].

16-bit words are stored in big-endian order.

__TOC__
==File format==

typedef tinystuff_file {
uint8_t resolution; /* 0 = low (320x200x16), 1 = medium (640x200x4), 2 = high (640x400x2) */
/* 3 = low and color animation is present, 4 = idem for medium, 5 = idem for high */
struct {
uint8_t animation_limits; /* High nibble = start limit, low nibble = end limit */
uint8_t animation_dirspeed; /* negative = left, positive = right, timebase 1/60 */
uint16_t duration; /* number of iterations */
} optional_animation_info;

uint16_t palette[16];
uint16_t number_of_control_bytes;
uint16_t number_of_data_words;

uint8_t control_bytes[];
uint16_t data_words[];
} tinystuff_file;

==Decompression algorithm==

Unlike most other [[RLE]] variants, the control bytes and data are stored non-interleaved.

x refers to the current control byte, d and d+1 refer to the current and next data word:

x < 0 -x literal words
x == 0 d times d+1
x == 1 d literal words
x > 1 x times d

==Uncompressed data format==

The uncompressed data consists of four sets of 20 vertical columns. Each column is 16-bits wide.

for (set=0; set<4; set++)
for (column=set; column<80; column++)
for (scanline=0; scanline<200; scanline++) { }

Medium and high resolution data are handled as if they were low resolution.

[[Category:Image Formats]]
</span>