Surface#get_at doesn't work with 8 bit PNGs
Reported by John Croisant | June 18th, 2008 @ 01:20 AM | in 2.4 (Event)
Originally reported by: Aureliano Calvo - aurelianito
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The get_at method in the surface method is not working correctly on 8bits png.
For instance, using the attached file,
image = Rubygame::Surface.load_image("eye_8bits.png")
image.get_at(0,0)
returns [0, 0, 0, 0] # black
instead of [255, 0, 0, 255] # red
Comments and changes to this ticket
-
Trickster June 18th, 2008 @ 08:06 PM
Actually this is supposed to happen
that image loads as an 8bit surface and any operation that takes a color on an 8 bit surface takes in a integer representing the palette entry.
surf = Rubygame::Surface.load('eye_8bits.png')
p surf.depth #=> 8
p surf.get_at(0, 0) #=> [0, 0, 0, 0] aka first entry in the surface's palette
p surf.palette[0..2] #=> should be [255, 0, 0]
Just trying to help ;)
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John Croisant August 16th, 2008 @ 05:00 PM
- → Milestone changed from “Surface & Rect” to “2.4 (Event)”
- → Tag changed from “” to “@bug color surface”
- → State changed from “new” to “resolved”
@Trickster: Actually, this is not supposed to happen, because the defined behavior of Surface#get_at says that it returns the RGB values of the pixel. It doesn't say "... unless it's an 8-bit Surface". ;-)
The problem was a stupid if-statement that I wrote that shouldn't have been there.
Anyway: this issue is fixed in the master branch and will be rolled out with Rubygame 2.4.
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Flexible library for making games with the Ruby language.
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