MESSAGE
| DATE | 2016-11-17 |
| FROM | Ruben Safir
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| SUBJECT | Subject: [Learn] Fwd: [Hangout-NYLXS] Fwd: PNG Coding
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From learn-bounces-at-nylxs.com Thu Nov 17 08:06:26 2016
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From: Ruben Safir
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Subject: [Learn] Fwd: [Hangout-NYLXS] Fwd: PNG Coding
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I found a nice small implementation to try to understand for PNG coding
that is not reliant on libpng
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From: ruben safir
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Subject: PNG Coding
Date: Tue, 15 Nov 2016 14:46:12 -0500
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Does anyone know of any sample code for reading PNG files that doesn't
include using libpng.... just straight direct access.
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From: "Alf P. Steinbach"
Newsgroups: comp.lang.c++
Subject: Re: PNG Coding
Date: Tue, 15 Nov 2016 20:46:31 +0100
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On 15.11.2016 20:46, ruben safir wrote:
> Does anyone know of any sample code for reading PNG files that doesn't
> include using libpng.... just straight direct access.
>
Find the specification, code it up?
Cheers!,
- Alf
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Subject: Re: PNG Coding
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ruben safir writes:
>Does anyone know of any sample code for reading PNG files that doesn't
>include using libpng.... just straight direct access.
libpng, being open source, would seem to be the best starting point
for someone who wishes to code the same functionality.
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From: Popping mad
Newsgroups: comp.lang.c++
Subject: Re: PNG Coding
Date: Tue, 15 Nov 2016 20:53:48 +0000 (UTC)
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On Tue, 15 Nov 2016 19:58:33 +0000, Scott Lurndal wrote:
> libpng, being open source, would seem to be the best starting point for
> someone who wishes to code the same functionality.
maybe, but its complex and I think it is broken. At some point they
decided to fix a long standing bug that has rended most of my early png
files useless. And the programs design to fix them don't work, so I want
to excavate the problem myself. I'm not looking to create a huge
library, just to look at the files at this point under the hood,
perferably in a single file program
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From: Christian Gollwitzer
Newsgroups: comp.lang.c++
Subject: Re: PNG Coding
Date: Tue, 15 Nov 2016 21:31:16 +0100
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Am 15.11.16 um 20:46 schrieb ruben safir:
> Does anyone know of any sample code for reading PNG files that doesn't
> include using libpng.... just straight direct access.
>
Sean Barret has very impressive (compact) C code to write PNG files in
stb_image_write.h:
https://github.com/nothings/stb
I have not checked if this does reading of PNGs, too; however he has a
ite here on github which lists similar libraries, and this refers to
http://lodev.org/lodepng/
Christian
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From: Popping mad
Newsgroups: comp.lang.c++
Subject: Re: PNG Coding
Date: Tue, 15 Nov 2016 20:50:01 +0000 (UTC)
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On Tue, 15 Nov 2016 21:31:16 +0100, Christian Gollwitzer wrote:
> https://github.com/nothings/stb
too complex. I'm just looking for PNG access
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From: Christian Gollwitzer
Newsgroups: comp.lang.c++
Subject: Re: PNG Coding
Date: Wed, 16 Nov 2016 00:15:06 +0100
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Am 15.11.16 um 21:50 schrieb Popping mad:
> On Tue, 15 Nov 2016 21:31:16 +0100, Christian Gollwitzer wrote:
>
>> https://github.com/nothings/stb
>
> too complex. I'm just looking for PNG access
>
Are you sure you read my reply?
https://github.com/lvandeve/lodepng
this is a 2-file solution to read/write PNG. There is an even smaller
version for reading only: http://lodev.org/lodepng/picopng.cpp
Considering the complexity of the task (decoding PNG), it is extremely
impressive to stuff that into these small files.
Christian
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From: Popping mad
Newsgroups: comp.lang.c++
Subject: Re: PNG Coding
Date: Wed, 16 Nov 2016 03:32:01 +0000 (UTC)
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On Wed, 16 Nov 2016 00:15:06 +0100, Christian Gollwitzer wrote:
> https://github.com/lvandeve/lodepng
ah, that is good. Thank you.
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From: Popping mad
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Subject: Re: PNG Coding
Date: Tue, 15 Nov 2016 20:50:23 +0000 (UTC)
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On Tue, 15 Nov 2016 12:06:12 -0800, Rick C. Hodgin wrote:
> On Windows
/dev/null
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