Text font/styleitem auto: styles support enchancement

[aboudreault]

There are some text font styles that are not supported: bold, italic, background color, shadow color and outline color. These styles support can be added in the mapogr.cpp file in the "msOGRLayerGetAutoStyle". Here are the following changes i'm going to do:

• Background color
  Changing these two lines code to "label.backgroundcolor":
  ​http://trac.osgeo.org/mapserver/browser/trunk/mapserver/mapogr.cpp#L2215
  ​http://trac.osgeo.org/mapserver/browser/trunk/mapserver/mapogr.cpp#L2273
  

This code make the background color applied to the foreground color and should be changed. However, this change will not make the background color work properly: see the following bug for more detail: ​bug 2705

• Outline color I made a patch for this support in GDAL/OGR and this version will be needed in the current version of MapServer, see the related bug:
  ​http://trac.osgeo.org/gdal/ticket/2480
  

We'll be able to add the oultline color support in the same way as the foreground/background color with the "outlinecolor" property of the label object.

• Shadow color
  This style is already in GDAL/OGR as "OGRSTLabelHColor" and will be added to MapServer in the same way as foreground/background color with the "backgroundshadowcolor" property of the label object.
  

• Bold and Italic
  These styles are already in GDAL/OGR. They'll be implemented in this way:
  If one style is set, the string "-bold"/ "-italic" will be concatenate to the fontname. If both are set, the string "-bold-italic" will be concatenate to the fontname.
  Arial bold fontname: arial-bold
  Arial italic fontname: arial-italic
  Arial bold italic fontname: arial-bold-italic

[aboudreault]

Here the patch. Like i mentionned in the bug description, the background don't work at the moment but should work after the "bug fix" of the ​bug 2705.

There is also a small modification about the Shadow color implementation. It's not the "backgroundshadowcolor" property, it's the "shadowcolor" property used for this style.

[dmorissette]

I have committed the patch (in r7826) with a small modification to include a

#if GDAL_VERSION_NUM >= 1600

around the code that uses the new OGRSTLabelOColor identifier that was added in GDAL for this.

Moving to doc component for Jeff to update the OGR HOWTO... the most important update for the docs is the new convention for font names with the -bold and -italic suffixes... the rest should be transparent to the users.

[dmorissette]

Reassigned to Jeff for docs updates, see last comment above.

[tbonfort]

mapogr.cpp needs to check for gdal version >=1.4 for the label shadowcolor part of this fix. fixed in r7837

[havatv]

Fixed for 6.0 and trunk in r12008.