Blitting a shape as a different color

shezzor · 25 August 2021, 23:54

Looking to get back into developing for the Amiga again but its been a few years so thought I'd pick up Blitz again to ease me back into it. So please excuse any noob questions

I have a mono colour font which I've cut up into a series of shapes. I render these as per normal as a sequence of characters from a string. However, I'm wondering if its possible to "blit" the font or rather the character shapes as a different colour, overriding the colour stored in the image. For example its currently stored as white (colour index 1) but I'd like to render them as red (colour index 8).

Is this possible and if so, I assume this would come with a perf hit?

Thanks

davideo · 26 August 2021, 00:59

Could you define colour 1 to be the same as colour 8?

Cobe · 26 August 2021, 01:16

Try blit shape#, x, y, 3

shezzor · 26 August 2021, 01:38

That actually works incredibly well Cobe and is exactly what I need. Thank you.

I just need to understand why that works now

I'm assuming it has to do with turning the bitplanes on/off.

Cobe · 26 August 2021, 01:52

Mm kinda.
When you have a shape with less bitplanes you can choose with that last parameter the bitplane on which you want it to be blitted.

25 August 2021, 23:54	#1
shezzor Registered User Join Date: Aug 2021 Location: Cheshire / UK Posts: 2	Blitting a shape as a different color Looking to get back into developing for the Amiga again but its been a few years so thought I'd pick up Blitz again to ease me back into it. So please excuse any noob questions I have a mono colour font which I've cut up into a series of shapes. I render these as per normal as a sequence of characters from a string. However, I'm wondering if its possible to "blit" the font or rather the character shapes as a different colour, overriding the colour stored in the image. For example its currently stored as white (colour index 1) but I'd like to render them as red (colour index 8). Is this possible and if so, I assume this would come with a perf hit? Thanks Last edited by shezzor; 25 August 2021 at 23:59.

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26 August 2021, 00:59	#2
davideo Amiga Tomcat Join Date: Sep 2007 Location: Boston Lincs Posts: 1,500	Could you define colour 1 to be the same as colour 8?

26 August 2021, 01:16	#3
Cobe Registered User Join Date: Jan 2014 Location: Belgrade / Serbia Age: 41 Posts: 999	Try blit shape#, x, y, 3

26 August 2021, 01:38	#4
shezzor Registered User Join Date: Aug 2021 Location: Cheshire / UK Posts: 2	That actually works incredibly well Cobe and is exactly what I need. Thank you. I just need to understand why that works now I'm assuming it has to do with turning the bitplanes on/off.

26 August 2021, 01:52	#5
Cobe Registered User Join Date: Jan 2014 Location: Belgrade / Serbia Age: 41 Posts: 999	Mm kinda. When you have a shape with less bitplanes you can choose with that last parameter the bitplane on which you want it to be blitted.

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