Author Topic: Smaller images from a larger image (Read 2843 times)

tntexplosivesltd · « **on:** February 13, 2011, 09:40:10 am »

Hi.
I am wondering how to load an image of ASCII characters and create many smaller images (one for each letter) from that large image.
Thank you in advance,
tntexplosivesltd.

devlin · « **Reply #1 on:** February 13, 2011, 09:50:12 am »

http://www.sfml-dev.org/documentation/2.0/classsf_1_1Image.htm

http://www.sfml-dev.org/documentation/2.0/classsf_1_1Image.htm (in particular SetSubRect)

It's all in the documentation

tntexplosivesltd · « **Reply #2 on:** February 13, 2011, 10:00:31 am »

I want to use the images to draw text in openGL. SetSubRect looks to be going the wrong way about it. Found a link myself anyway:
http://www.sfml-dev.org/forum/viewtopic.php?t=2790

tntexplosivesltd · « **Reply #3 on:** February 13, 2011, 10:14:52 am »

Hmm... this shows image --> C++ STL vector --> image.
Can I just do image --> image?

Laurent · « **Reply #4 on:** February 13, 2011, 10:34:42 am »

You can use Image::Copy.

But why do you want to break your big image into individual smaller images? Rendering them will be much more efficient if they are all in the same texture.

tntexplosivesltd · « **Reply #5 on:** February 13, 2011, 10:36:37 am »

So how can I pass the letters to OpenGL individually?

Laurent · « **Reply #6 on:** February 13, 2011, 10:47:33 am »

With texture coordinates (Image::GetTexCoords).