How to draw2DImage without a specific pixel?

[MasterGod]

How to draw2DImage without a specific pixel?
E.g I have a 16x16 image and I want to draw it without the pixel at 8x8, how can I accomplish that?

Thanks.

[Frosty Topaz]

Only thing I can think of is to manually edit the image and remove the pixel.

[Dark_Kilauea]

by edit, you can always use the lock() and unlock() interface to edit the texture in real time.

[JP]

Yeah there's no other way to do it really... Technically you could do it by drawing it onto something more complicated than a simple 2 poly quad and have a 1 pixel gap in the quad where you don't want anything drawn but that would be a bit too complicated for your needs and i suspect you might want to not draw any number of pixels instead of just the one at 8x8?

So i reckon you'd have to edit the texture with lock() and unlock(). Maybe you'd want to make a completely new copy of the texture so that you have the original, unedited texture to fall back on, depending on your needs.

[keless]

bitmask, anyone?

[JP]

Fair point...

[Acki]

you can also define a transparent color and set the pixle at 7,7 (for pixle 8,8 ) to this color (with lock/unlock)...

[MasterGod]

May I have a code snippet for such thing? I never worked with lock/unlock so I don't know how to use it.

[Acki]

something like this:

Code: Select all

SColor* colMap = (SColor*)theImage->lock();
// assuming the texture is 16x16 and you want pixle at 7,7
colMap[16 * 7 + 7] = SColor(add transparent color here);
theImage->unlock();

this is a simple example, but you can play around with it...