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How do I　alpha　blend the image? [message #46964]

Sat, 01 October 2016 15:32

kurete
Messages: 17
Registered: March 2016
Location: Japan

Promising Member

Hello.

How do I　alpha　blend the image?

For example, Additive blending and Multiplicative blending.

I think that rewrite source code of draw.

However, I can not know where to I be rewritten.

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Re: How do I　alpha　blend the image? [message #46965 is a reply to message #46964]

Mon, 03 October 2016 09:46

mirek
Messages: 14291
Registered: November 2005

Ultimate Member

kurete wrote on Sat, 01 October 2016 15:32

Hello.

How do I　alpha　blend the image?

For example, Additive blending and Multiplicative blending.

I think that rewrite source code of draw.

However, I can not know where to I be rewritten.

With what? In Paint?

Mirek

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Re: How do I　alpha　blend the image? [message #46968 is a reply to message #46965]

Tue, 04 October 2016 13:40

kurete
Messages: 17
Registered: March 2016
Location: Japan

Promising Member

I'm sorry for description is insufficient.

I want to alpha blend image in Paint in Ctrl.

For Example, I want to change DrawImage in Function that is alpha blend in under source code.


void ExmampleCtrl::Paint(Draw& w)
{
　　w.DrawImage(0,0,Sample::Image() );→change alpha blend function 
};

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Re: How do I　alpha　blend the image? [message #46969 is a reply to message #46968]

Tue, 04 October 2016 19:56

mirek
Messages: 14291
Registered: November 2005

Ultimate Member

kurete wrote on Tue, 04 October 2016 13:40

I'm sorry for description is insufficient.

I want to alpha blend image in Paint in Ctrl.

For Example, I want to change DrawImage in Function that is alpha blend in under source code.
void ExmampleCtrl::Paint(Draw& w)
{
　　w.DrawImage(0,0,Sample::Image() );→change alpha blend function 
};

Image already has alpha channel, so DrawImage will use standard alpha blending. More complex alpha bledning modes are not supported in Draw, because Draw is supposed to be lowest common denominator that allows HW acceleration on all targets.

If you need anything more fancy (like different blend function), you need to perform calculations in memory - which in fact is quite easy, as Image internals are easily accessible.

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