C language > Graphics programming

GDI+ WebP support

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John Z:
Over on the MASM site there was mention of GDI+ supporting WebP format 'soon'. This was back in Nov 2022.
http://masm32.com/board/index.php?topic=10437.msg114912#msg114912

Does it work for windows 10/11 now?  Guess I could just try but maybe someone knows already if
GDILoadPictureFile and GdipLoadImageFromFile work for WebP and maybe HEIF too.

There are 'work arounds' here https://forum.pellesc.de/index.php?topic=10593.0 but direct GDI+ would make it simple.

Thanks,
John Z

MrBcx:
I discovered some apps (Most browsers, Media Player Classic, Paint 3D, others ) will display locally stored webp images.

I also discovered this repository:
https://storage.googleapis.com/downloads.webmproject.org/releases/webp/index.html

I downloaded the latest 64-bit version for Windows and unzipped.
Inside the /bin/ folder are several compiled apps ... notably,   dwebp

I converted a local webp image to a png on my first go:

C:\Temp>dwebp tree.webp  -o tree.png

So, if shelling out to dwebp doesn't send you screaming towards the door,
then you now have a simple way to give yourself access to webp images.

John Z:
Thanks MrBcx,

I can easily use Ifranview for that both interactive and command line. 

vCardz_i supports a few image formats so I was thinking of updating it
to include WebP for photo and logo data. If GDI+ supports it then it is
just a matter of allowing the extension. Probably I just need to try it.

John Z

Vortex:
Hi John,

I tested Timo's example project on Win10PE, it works fine.

John Z:

--- Quote from: Vortex on February 26, 2023, 09:20:28 PM ---Hi John,

I tested Timo's example project on Win10PE, it works fine.

--- End quote ---

Thanks! I'm going to code it - that's all  :) :)

I'll post back success or fail

John Z

Update: Added WebP file handling but it fails to display.  GdipLoadImageFromFile does not load a WebP file.  Windows 11 2H22, OS build 22621.1265

GpStatus WINGDIPAPI GdipLoadImageFromFile(GDIPCONST WCHAR* filename, GpImage **image);

I'll wait ....

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