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Re: problem drawing transparent fill to NSImage
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Re: problem drawing transparent fill to NSImage

Hi,

Thanks for the replies!

I've changed things a bit where I'm now creating an NSImage in place of directly calling NSRectFill(). Oddly, I have ended up having to do two different compositing operations when I draw the image depending on the situation.

In one situation I'm drawing the NSImage in an overlay view (transparent window) where I have to use NSCompositeSourceIn in order to see the view underneath properly, and then in another situation where I'm compositing this same NSImage over another NSImage I have to use NSCompositeSourceOver in order to see underneath properly.

Does this sound right?

- John


Hey there,

NSRectFill uses NSCompositeCopy which will blow away the pixels in the destination. Try using NSRectFillUsingOperation with NSCompositeSourceOver.

Later,
Guy


Hi,

I'm drawing into NSImage by drawing another NSImage and then using NSRectFill() ot overlay a semi-transparent colour. The image is created fine if I don't draw the semi-transparent fill, but if I do then the fill covers the image and the image is not visible.

Why is the transparent fill not transparent?

Thanks.

- John 
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References: 


 >problem drawing transparent fill to NSImage (From: john <email@hidden>)


 >Re: problem drawing transparent fill to NSImage (From: Guy English <email@hidden>)























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