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Author Topic: Smaller images from a larger image  (Read 2015 times)

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tntexplosivesltd

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Smaller images from a larger image
« 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

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Smaller images from a larger image
« Reply #1 on: February 13, 2011, 09:50:12 am »

tntexplosivesltd

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Smaller images from a larger image
« 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

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Smaller images from a larger image
« 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

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Smaller images from a larger image
« 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.
Laurent Gomila - SFML developer

tntexplosivesltd

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Smaller images from a larger image
« Reply #5 on: February 13, 2011, 10:36:37 am »
So how can I pass the letters to OpenGL individually?

Laurent

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Smaller images from a larger image
« Reply #6 on: February 13, 2011, 10:47:33 am »
With texture coordinates (Image::GetTexCoords).
Laurent Gomila - SFML developer

 

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