How to use Form pixelCompare:with:at:
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How to use Form pixelCompare:with:at:
 
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Re: How to use Form pixelCompare:with:at:
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On 07.01.2014, at 15:19, Herbert König <[hidden email]> wrote:
> Hi, > > Form>>pixelCompare:with:at: seems to always return 0. > > I use it like > |pict1 pict2| > pict1 := (Form extent: 100@100 depth: 32) fillBlack. > pict2 := (Form extent: 100@100 depth: 32) fillWithColor: Color red. > pict1 pixelCompare: pict1 boundingBox with: pict2 at: 0@0 > > As I get the same result in a 4.4 and a 3.8 image I guess I don't understand how it's used. No senders in either image. - Bert - _______________________________________________ Beginners mailing list [hidden email] http://lists.squeakfoundation.org/mailman/listinfo/beginners |
smime.p7s (5K)
Re: How to use Form pixelCompare:with:at:
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Re: How to use Form pixelCompare:with:at:
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On 07.01.2014, at 16:13, Herbert König <[hidden email]> wrote: > Hi Bert, > > Am 07.01.2014 15:57, schrieb Bert Freudenberg: >> Try 16 bit forms. - Bert - > thanks, that works. > > Is this a bug or infeasible with 32 Bit Forms? it's surprisingly fast. (I'm dealing with Photos) It's using BitBlt so should be fast indeed. Sounds like a bug that it does not work in 32 bits, at least according to the comment. OTOH all the BitBlt tally operations only work up to 16 bit depth. With 32 bit forms you could easily overflow a SmallInteger. So you might want to reduce the depth of the forms anyway before comparing. - Bert - _______________________________________________ Beginners mailing list [hidden email] http://lists.squeakfoundation.org/mailman/listinfo/beginners |
Re: How to use Form pixelCompare:with:at:
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