A picture.datatype with alphachannel support is required.

AGS · 26 August 2014, 14:55

Hi,

I need a v45 picture.datatype for coding that returns alpha information. This must exist, even that cybergraphics does not support alpha.

thanks,
A

PeterK · 26 August 2014, 15:08

You would better forget about it, since there is NO picture.datatype v45 that is really supporting the alpha channel information.

For PNG images you can use the pngalpha.library instead, but it's not the best solution.
http://aminet.net/search?query=pngalpha

AGS · 26 August 2014, 15:38

@PeterK

I had a look on your iconlibrary source. Seems like the png functions w/ zlib support could be extracted and used for my purposes. Would you help me with this?

cheers,
A

PeterK · 26 August 2014, 16:05

Yes of course, no problem.

But there are some small limitations coming with my code. My PNG decoding is restricted to those PNG formats that are required by icons. Thus not all formats, like interlaced images or palettes for example, are supported in my library. Only RGB and RGBA are decoded.

The zlib decoder has been extracted from zlib.library v3.2 and is based on the old zlib 1.14. I've tried to optimize it as good as possible and you can easily find it at the end of my lib by searching for "zzz". It requires the parameters in D0, A0, D1 and A1 as source buffer and size plus destination buffer and size.

Please send me an email if you have questions.

AGS · 26 August 2014, 17:35

Please have a loog there: http://eab.abime.net/showthread.php?p=972329#post972329

It does not look correct. It's yet done with that pngalpha.library.

BigFan · 26 August 2014, 18:31

No, it's not.
It is bad code that causes the crappy output. The computer is only doing what you ordered him to do.

How many threads are required for a simple task?

26 August 2014, 14:55	#1
AGS XoXo/Tasko Developer Join Date: Dec 2013 Location: Munich Age: 48 Posts: 450	A picture.datatype with alphachannel support is required. Hi, I need a v45 picture.datatype for coding that returns alpha information. This must exist, even that cybergraphics does not support alpha. thanks, A

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26 August 2014, 15:08	#2
PeterK Registered User Join Date: Apr 2005 Location: digital hell, Germany, after 1984, but worse Posts: 3,378	You would better forget about it, since there is NO picture.datatype v45 that is really supporting the alpha channel information. For PNG images you can use the pngalpha.library instead, but it's not the best solution. http://aminet.net/search?query=pngalpha

26 August 2014, 15:38	#3
AGS XoXo/Tasko Developer Join Date: Dec 2013 Location: Munich Age: 48 Posts: 450	@PeterK I had a look on your iconlibrary source. Seems like the png functions w/ zlib support could be extracted and used for my purposes. Would you help me with this? cheers, A

26 August 2014, 16:05	#4
PeterK Registered User Join Date: Apr 2005 Location: digital hell, Germany, after 1984, but worse Posts: 3,378	Yes of course, no problem. But there are some small limitations coming with my code. My PNG decoding is restricted to those PNG formats that are required by icons. Thus not all formats, like interlaced images or palettes for example, are supported in my library. Only RGB and RGBA are decoded. The zlib decoder has been extracted from zlib.library v3.2 and is based on the old zlib 1.14. I've tried to optimize it as good as possible and you can easily find it at the end of my lib by searching for "zzz". It requires the parameters in D0, A0, D1 and A1 as source buffer and size plus destination buffer and size. Please send me an email if you have questions.

26 August 2014, 17:35	#5
AGS XoXo/Tasko Developer Join Date: Dec 2013 Location: Munich Age: 48 Posts: 450	Please have a loog there: http://eab.abime.net/showthread.php?p=972329#post972329 It does not look correct. It's yet done with that pngalpha.library.

26 August 2014, 18:31	#6
BigFan Registered User Join Date: Feb 2014 Location: Germany Posts: 261	No, it's not. It is bad code that causes the crappy output. The computer is only doing what you ordered him to do. How many threads are required for a simple task?

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