Brick - Revision history

88.162.24.61: Hi, this is Lupin, I think the width/height and offsets were in reverse order

2016-10-04T21:26:58Z

Hi, this is Lupin, I think the width/height and offsets were in reverse order

← Older revision		Revision as of 21:26, 4 October 2016
Line 67:		Line 67:
	)File Structure*		)File Structure*

	0. byte : ~~offset X~~		0. byte : width
	1. byte : ~~offset Y~~		1. byte : height
	2. byte : ~~width~~		2. byte : offset X
	3. byte : ~~height~~		3. byte : offset Y
	following bytes: Run-length encoded data		following bytes: Run-length encoded data
	</pre>		</pre>

Zink at 09:45, 10 February 2013

2013-02-10T09:45:42Z

← Older revision		Revision as of 09:45, 10 February 2013
Line 1:		Line 1:
	{{Infobox format		{{Infobox format
	\| extension = BRK		\| extension = BRK
			\| lba1 = true
	\| occurence = LBA1 & LBA2
			\| lba2 = true
	\| colour = F3F2AD		\| colour = F3F2AD
	}}		}}
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	{{providers\|[[provider::Zink]] and [[provider::Omni]]}}		{{providers\|[[provider::Zink]] and [[provider::Omni]]}}

	[[Category:LBA 1]]
	[[Category:LBA 2]]

Zink at 19:56, 9 February 2013

2013-02-09T19:56:15Z

← Older revision		Revision as of 19:56, 9 February 2013
Line 75:		Line 75:
	{{providers\|[[provider::Zink]] and [[provider::Omni]]}}		{{providers\|[[provider::Zink]] and [[provider::Omni]]}}

	{{DEFAULTSORT:Brick}}
	[[Category:File formats\|Brick]]
	[[Category:LBA 1]]		[[Category:LBA 1]]
	[[Category:LBA 2]]		[[Category:LBA 2]]

Zink: Created page with "{{Infobox format | extension = BRK | occurence = LBA1 & LBA2 | colour = F3F2AD }} Brick files are small images (similar to sprites) of constant dimensions, that are used to b..."

2013-02-09T17:10:20Z

Created page with "{{Infobox format | extension = BRK | occurence = LBA1 & LBA2 | colour = F3F2AD }} Brick files are small images (similar to sprites) of constant dimensions, that are used to b..."

New page

{{Infobox format
| extension = BRK
| occurence = LBA1 & LBA2
| colour = F3F2AD
}}

Brick files are small images (similar to sprites) of constant dimensions, that are used to build up the isometric game environment.
Brick files use run-length encoding (a form of compression).

== Specification ==
{{Cleanup|It should be reformatted to use wikitext instead of <pre> tags.}}
<pre>
Abstract:
the brick pixel data is run-length encoded and palette indexed.

Details:

*)***Run-length Encoding***

-the data is organized into rows
-every row is formed of several "runs"
a run is a sequence of pixels and defines what "comes
out" in the final pixel-based image.
-there are 3 forms of runs:
1. the skip run:
this run defines a sequence of pixels in the
final image which are NOT filled.
2. the color run:
this run defines a sequence of pixels in the
final image which are all set to the same color.
3. the copy run:
this run defines a sequence of pixels in the
final image which show no pattern an therefore
are copied directly.

now the actual algorithm:

for all rows do
read byte : number of runs
for number of runs do
read byte : run specification
extr. lowest 6 bits of run specification : run-length
run-length = runlength + 1
extr. bit #7 of run specification : color flag
extr. bit #8 of run specification : copy flag
if color flag is set
read byte : color
for run-length do
fill pixel with color
end for
else if copy flag is set
for run-length do
read byte : color
fill pixel with color
end for
else (both flags unset)
for run-length do
skip pixel
end for
end if
end for
end for

the run-lenth is always increased by one because a run-length of zero doesn't make sense.

*)***File Structure***

0. byte : offset X
1. byte : offset Y
2. byte : width
3. byte : height
following bytes: Run-length encoded data
</pre>

{{providers|[[provider::Zink]] and [[provider::Omni]]}}

{{DEFAULTSORT:Brick}}
[[Category:File formats|Brick]]
[[Category:LBA 1]]
[[Category:LBA 2]]