[Bug 44409] png with indexed colors and alpha miss the alpha channel on loading

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=44409

Sagawa <sagawa.aki+winebugs at gmail.com> changed:

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                 CC|                            |sagawa.aki+winebugs at gmail.c
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--- Comment #2 from Sagawa <sagawa.aki+winebugs at gmail.com> ---
Created attachment 62716
  --> https://bugs.winehq.org/attachment.cgi?id=62716
WOLF RPG Editor (Editor.exe) screenshot on Wine 3.0.3

WOLF RPG Editor (Editor.exe) 2.24 suffers from this issue.

Please look at the attachment. In the picture, trees are painted in strange
color as if cherry blossoms. In the native, trees are green.

I inspected the issue and found out that map chip image
(Data\MapChip\[Base]BaseChip_pipo.png, which has tRNS chunk) is loaded as
PixelFormat8bppIndexed instead of PixelFormat32bppARGB. Editor.exe seems not to
handle 8bppIndexed image well.

I'm preparing a patch for this issue.

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