IImage downsize broken starting from 9.0.80 and not fixed in 9.0.81

[hflexgrig]

Description

I'm downsizeing image stream to send for OCR scanning for 3th party api. Starting from 9.0.80 release this functionality is broken on iOS, I downgraded to 9.0.70 and it again started work properly. Today tried new 81 release, and the issue still persists.

That's how I'm using it

var iImage = PlatformImage.FromStream(imageAsStream);

var newImage = iImage.Downsize(300, true);
......

Steps to Reproduce

iImage.Downsize creates much smaller or damaged image.

Link to public reproduction project repository

No response

Version with bug

9.0.80 SR8

Is this a regression from previous behavior?

Yes, this used to work in .NET MAUI

Last version that worked well

9.0.70 SR7

Affected platforms

iOS

Affected platform versions

No response

Did you find any workaround?

Downgrading to SR70

Relevant log output

[jfversluis]

Is this what you are seeing? #30006

Then it should in fact be fixed with 9.0.81. Do you have a reproduction we can look at?

[hflexgrig]

@jfversluis It is not only not changing size, but also flips vertically on 9.0.80

On 9.0.81 it is changes the size, but still flips the vertically

On 9.0.70 also flips vertically..

attaching source code

https://github.com/hflexgrig/ImageDownsizeIssue

[hflexgrig]

From the sample code above looks like 70 and 81 are identical, but from my original app, still OCR scanning fails for 81 and works properly on 70. Maybe it does something else with the image?

[lionelmennig]

I confirm I also have this wrong behavior since 9.0.80 (and also applies to 9.0.81). I've been trying to replace the DownSize() with computed Resize() but it breaks the thing as well (messed up w/h ratio, undesired rotation). Android seems to be kind of failing as well (undesired rotation).

EDIT:

9.0.80 :

• (iOS simulator 17.5) : rotated (180°) AND flipped horizontally
• (iPhone 17.6.1) : rotated (90°) AND taking 25% of available space (top-left corner)

9.0.81 :

• (iOS simulator 17.5) : == 9.0.80
• (iPhone 17.6.1) : rotated (90°) AND taking 100% of available space BUT broken width/height ratio AND flipped horizontally

EDIT(2):

I just noticed that 9.0.51 already has the "180° AND flipped horizontally" behavior (at least on simulator). 9.0.40 works fine.

[NirmalKumarYuvaraj]

This issue has been verified in Visual Studio Code 1.101.2 with MAUI versions (9.0.80 & 9.0.81). It can be reproduced on IOS and Mac platform. It is not reproduced in v9.0.70.