[Bugs] #2188 UNSP: read pixel pushes an int to stack

[Sugar Labs Bugs]

#2188: read pixel pushes an int to stack
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    Reporter:  tonyforster                |          Owner:  walter                     
        Type:  defect                     |         Status:  new                        
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  Turtleart                  |        Version:  Unspecified                
    Severity:  Unspecified                |       Keywords:  dextrose                   
Distribution:  Unspecified                |   Status_field:  Unconfirmed                
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Comment(by walter):

 Also attached is the output of the read pixel test.

 Note that since the color values in the palette are 8,8,8 bit rgb and the
 XO is 5,6,5, we'll not necessarily ever get an exact match. Currently I
 shift the red and blue values by 3 and the green values by 2. Perhaps I
 should change the palette to use the 5, 6, 5 colors so that we get an
 exact match (but this is only going to work for gray == 100 and shade ==
 5.

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Ticket URL: <http://bugs.sugarlabs.org/ticket/2188#comment:6>
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