[mapserver-dev] Undocumented Mapfile COLOR options

[Lime, Steve D (MNIT)]

I'll review and get back to you.

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From: mapserver-dev [mailto:mapserver-dev-bounces at lists.osgeo.org] On Behalf Of Seth G
Sent: Wednesday, July 22, 2020 4:45 PM
To: mapserver-dev at lists.osgeo.org
Subject: [mapserver-dev] Undocumented Mapfile COLOR options

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Hi all,

Whilst validating various Mapfiles to try and find all valid options I've come across a couple of special values used in msautotest Mapfiles for COLOR - the first is -255 -255 -255 used in classtest1.map [1]

CLASS
    NAME "Text"
    EXPRESSION ([pixel] == 0)
    COLOR -255 -255 -255
END

This value is defined in mapserver.h [2] as follows:

#define MS_TRANSPARENT_COLOR(color) (((color).alpha==0 || (color).red==-255 || (color).green==-255 || (color).blue==-255)?MS_TRUE:MS_FALSE)

So can this be set to make a color transparent? Is it a valid value and if so should this be added somewhere in the docs? There is currently no reference.

The second example is:

BACKGROUNDCOLOR -1 -1 -1

LABEL BACKGROUNDCOLOR was removed in 6.0 [3] but is still present in mapserver\msautotest\misc\sde_utf2.map

One of the Python MapScript tests refers to this value as an "invalid color" that should throw an error [4]

Any details on these 2 COLOR values appreciated,

Seth


[1] https://gcc01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fmapserver%2Fmapserver%2Fblob%2F85e294e8c8ce3c9c455fea0137d4af1ee2feced0%2Fmsautotest%2Fgdal%2Fclasstest1.map%23L33&data=02%7C01%7Csteve.lime%40state.mn.us%7C87803843a85343091bf208d82e88a33d%7Ceb14b04624c445198f26b89c2159828c%7C0%7C0%7C637310511680323790&sdata=djY1PqL0p77sn6PTN46HpTa2iyw10EKxkNc3EHLGoFo%3D&reserved=0
[2] https://gcc01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fmapserver%2Fmapserver%2Fblob%2F06a076e9d0992f3ace676933ddcde87985feea31%2Fmapserver.h%23L369&data=02%7C01%7Csteve.lime%40state.mn.us%7C87803843a85343091bf208d82e88a33d%7Ceb14b04624c445198f26b89c2159828c%7C0%7C0%7C637310511680323790&sdata=SO9%2FJTY1XM6X%2FFmNKsrtpI32qAQ%2FGzKMVUtjncLk9PA%3D&reserved=0
[3] https://gcc01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fmapserver.org%2Fmapfile%2Flabel.html%23mapfile-label-backgroundcolor&data=02%7C01%7Csteve.lime%40state.mn.us%7C87803843a85343091bf208d82e88a33d%7Ceb14b04624c445198f26b89c2159828c%7C0%7C0%7C637310511680323790&sdata=WD8h2IklWjNr6o58LOWbKDD87mptfZiU31DXbzVspzE%3D&reserved=0
[4] https://gcc01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fmapserver%2Fmapserver%2Fblob%2F85e294e8c8ce3c9c455fea0137d4af1ee2feced0%2Fmapscript%2Fpython%2Ftests%2Fcases%2Fcolor_test.py%23L50&data=02%7C01%7Csteve.lime%40state.mn.us%7C87803843a85343091bf208d82e88a33d%7Ceb14b04624c445198f26b89c2159828c%7C0%7C0%7C637310511680323790&sdata=iaqNkzBuk07janjkTRx1V8hzrK3yFH4Ms6%2FlCNVpOrc%3D&reserved=0

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