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devel / comp.os.ms-windows.programmer.win32 / Re: GDIPlus - add a webp image decoder ?

SubjectAuthor
* GDIPlus - add a webp image decoder ?R.Wieser
`* GDIPlus - add a webp image decoder ?JJ
 `* GDIPlus - add a webp image decoder ?R.Wieser
  `* GDIPlus - add a webp image decoder ?JJ
   `- GDIPlus - add a webp image decoder ?R.Wieser

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GDIPlus - add a webp image decoder ?

<ujv0ga$372v7$1@dont-email.me>

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From: address@is.invalid (R.Wieser)
Newsgroups: alt.comp.os.windows-xp,comp.os.ms-windows.programmer.win32
Subject: GDIPlus - add a webp image decoder ?
Date: Sun, 26 Nov 2023 09:43:40 +0100
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 by: R.Wieser - Sun, 26 Nov 2023 08:43 UTC

Hello all,

Some time ago I stumbled over a few webp images. After some some
websearching I found a dll which could decode them into a raw byte arrays,
and with help of GDI+ I was able to save that into a native format (jpg,
png, etc), allowing me to view the resulting images.

While doing the above I was (again) made aware that GDI+ has(?) installable
image decoders & encoders. So, I thought it would be an idea to see if I
could write-and-install a webp decoder to that list.

The thing is, I can't seem to find anything of worth regarding native GDI+
installable image decoders, and only very little about a WIC type of
decoder. At least not enough to be able to get a complete picture about
what needs to be done.

So, I'm wondering if anyone here knows anything about how to create,
preferrably, a native GDI+ decoder - though information about how to create
WIC type of decoder is quite welcome too. (I'm an Assembly programmer, which
is why I rather work with the former than the latter)

Regards,
Rudy Wieser

Re: GDIPlus - add a webp image decoder ?

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From: jj4public@outlook.com (JJ)
Newsgroups: alt.comp.os.windows-xp,comp.os.ms-windows.programmer.win32
Subject: Re: GDIPlus - add a webp image decoder ?
Date: Mon, 27 Nov 2023 10:59:09 +0700
Organization: To protect and to server
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 by: JJ - Mon, 27 Nov 2023 03:59 UTC

On Sun, 26 Nov 2023 09:43:40 +0100, R.Wieser wrote:
> Hello all,
>
> Some time ago I stumbled over a few webp images. After some some
> websearching I found a dll which could decode them into a raw byte arrays,
> and with help of GDI+ I was able to save that into a native format (jpg,
> png, etc), allowing me to view the resulting images.
>
> While doing the above I was (again) made aware that GDI+ has(?) installable
> image decoders & encoders. So, I thought it would be an idea to see if I
> could write-and-install a webp decoder to that list.
>
> The thing is, I can't seem to find anything of worth regarding native GDI+
> installable image decoders, and only very little about a WIC type of
> decoder. At least not enough to be able to get a complete picture about
> what needs to be done.
>
> So, I'm wondering if anyone here knows anything about how to create,
> preferrably, a native GDI+ decoder - though information about how to create
> WIC type of decoder is quite welcome too. (I'm an Assembly programmer, which
> is why I rather work with the former than the latter)
>
> Regards,
> Rudy Wieser

You can learn from examples, such as below PGM WIC codec.

https://github.com/vbaderks/netpbm-wic-codec

Re: GDIPlus - add a webp image decoder ?

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From: address@is.invalid (R.Wieser)
Newsgroups: alt.comp.os.windows-xp,comp.os.ms-windows.programmer.win32
Subject: Re: GDIPlus - add a webp image decoder ?
Date: Mon, 27 Nov 2023 08:08:45 +0100
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 by: R.Wieser - Mon, 27 Nov 2023 07:08 UTC

JJ,

>> So, I'm wondering if anyone here knows anything about how to create,
>> preferrably, a native GDI+ decoder - though information about how to
>> create
>> WIC type of decoder is quite welcome too. (I'm an Assembly programmer,
>> which
>> is why I rather work with the former than the latter)

> You can learn from examples, such as below PGM WIC codec.
>
> https://github.com/vbaderks/netpbm-wic-codec

Thanks for the link.

Thoug part of the problem with the WIC style approach is that I would need
to figure out what the methods and properties of each of the used objects is
(in vtable order!) - which is normally not something thats part of such an
example.

(I've had to do similar often enough to know its a hit-or-miss kind of thing
trying to google for it ...)

Nonetheless, its more than I had before. :-)

Regards,
Rudy Wieser

Re: GDIPlus - add a webp image decoder ?

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From: jj4public@outlook.com (JJ)
Newsgroups: alt.comp.os.windows-xp,comp.os.ms-windows.programmer.win32
Subject: Re: GDIPlus - add a webp image decoder ?
Date: Tue, 28 Nov 2023 08:12:04 +0700
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 by: JJ - Tue, 28 Nov 2023 01:12 UTC

On Mon, 27 Nov 2023 08:08:45 +0100, R.Wieser wrote:
>
> Thanks for the link.
>
> Thoug part of the problem with the WIC style approach is that I would need
> to figure out what the methods and properties of each of the used objects is
> (in vtable order!) - which is normally not something thats part of such an
> example.
>
> (I've had to do similar often enough to know its a hit-or-miss kind of thing
> trying to google for it ...)
>
> Nonetheless, its more than I had before. :-)

AFAIK, in the reference part of Microsoft SDK documentations, the list of
methods of an interface is always in VTable order. You can still check the
relevant C header file if you have doubts.

Re: GDIPlus - add a webp image decoder ?

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From: address@is.invalid (R.Wieser)
Newsgroups: alt.comp.os.windows-xp,comp.os.ms-windows.programmer.win32
Subject: Re: GDIPlus - add a webp image decoder ?
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 by: R.Wieser - Tue, 28 Nov 2023 06:54 UTC

JJ,

> AFAIK, in the reference part of Microsoft SDK documentations, the
> list of methods of an interface is always in VTable order. You can
> still check the relevant C header file if you have doubts.

As mentioned, I've googled quite a bit in search of how to "talk to"
objects. And it always was a problem finding the vtbale information, even
for common MS objects.

But if you know where I can find on-line Microsoft SDK documentation I would
be much obliged.

Currently the most pertinent information I can find is learn.microsoft.com,
but even that one has its problems. Just yesterday I was having a problem
with a standard GDI+ function, GdipCreateBitmapFromScan0 . Try to find some
MS documentation about it (and its sibblings) and you get nowhere fast. :-(

Regards,
Rudy Wieser

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