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ColorBgra.ToOpaqueInt32() can't take transparency... why?


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System.InvalidOperationException: Alpha value must be 255 for this to work
  at PaintDotNet.ColorBgra.ToOpaqueInt32(ColorBgra color)

Seems silly to me. Doesn't the name imply that int32 returned will be of the opaque version of the input color? It doesn't make sense that it should require an already-opaque color. Maybe I'm just being naive... :roll:

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The To/From Opaque functions were really only added for use with the IndirectUI color wheel control.

The reason it requires an alpha value of 255 is because that is the only unambiguous case for conversion. If alpha is 128, then there are different methods of transforming the R,G,B values ... do you pre-multiply or not, etc.? The end result is an opaque color but may not be the one that was desired. By requiring A=255, there is simply no ambiguity. If you need a different conversion method, it is easy enough to implement it yourself.

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Normally I wouldn't have even bothered with a post about it; I'd just have written my own implementation and that would be that. In this case, though, I made a bad assumption, implemented it, didn't bother testing, and managed to have Ash make it crash :roll:

DOH!

See, c'mon man, there's usually a method to my madness :twisted:

...usually... ;)

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Moved to Effects API.

 

The Doctor: There was a goblin, or a trickster, or a warrior... A nameless, terrible thing, soaked in the blood of a billion galaxies. The most feared being in all the cosmos. And nothing could stop it, or hold it, or reason with it. One day it would just drop out of the sky and tear down your world.
Amy: But how did it end up in there?
The Doctor: You know fairy tales. A good wizard tricked it.
River Song: I hate good wizards in fairy tales; they always turn out to be him.

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But it isn't anymore! That's why I didn't chide you. :-)

EDIT: You done with this?

 

The Doctor: There was a goblin, or a trickster, or a warrior... A nameless, terrible thing, soaked in the blood of a billion galaxies. The most feared being in all the cosmos. And nothing could stop it, or hold it, or reason with it. One day it would just drop out of the sky and tear down your world.
Amy: But how did it end up in there?
The Doctor: You know fairy tales. A good wizard tricked it.
River Song: I hate good wizards in fairy tales; they always turn out to be him.

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Please, pester on!

 

The Doctor: There was a goblin, or a trickster, or a warrior... A nameless, terrible thing, soaked in the blood of a billion galaxies. The most feared being in all the cosmos. And nothing could stop it, or hold it, or reason with it. One day it would just drop out of the sky and tear down your world.
Amy: But how did it end up in there?
The Doctor: You know fairy tales. A good wizard tricked it.
River Song: I hate good wizards in fairy tales; they always turn out to be him.

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