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Author Topic: Transparent PNG showed inverted in Wine ( TImage problem )  (Read 21874 times)

Marc

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Re: Transparent PNG showed inverted in Wine ( TImage problem )
« Reply #15 on: September 02, 2010, 11:30:45 pm »
Quote from: JoshyFun on September 02, 2010, 12:22:23 am

I vote for 3 also, but there is also a possibility of only incorrect scanline report in presence of transparent layer :-?


The same code is used at different places too, but you probably wont hit it. There might also be an error in our own alphablend code. Need to check that with win95.

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Marc

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Re: Transparent PNG showed inverted in Wine ( TImage problem )
« Reply #16 on: September 03, 2010, 12:43:33 am »
I did some debugging on a testapp under wine.

It looks like alphablending a top-to-bottom dibsection results in a upsidedown image.

the alpha image is created at TWin32WidgetSet.StretchMaskBlt - CreatePremultipliedBitmap (win32api.inc:3420)
and is blended at line 3513.

the AlphaBlend routine is native wine.

I'll investigate more with some direct api calls, not using the lcl.
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alejol0

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Re: Transparent PNG showed inverted in Wine ( TImage problem )
« Reply #17 on: September 03, 2010, 06:01:27 am »
Marc, I appreciate your effort. Thanks!!
I have reported this bug to Wine developers too.
Good luck!!
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