Review Request: Add a generic mechanism to render solid backgrounds behind plasma frames

[David Nolden]

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http://reviewboard.kde.org/r/591/
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Review request for Plasma.


Summary
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This allows making transparent themes "solid" in a relatively nice-looking way. My idea is that there would at least a few configurable background-providers: User-chosen solid color(with alpha value), user-chosen pattern(tinted by solid color with alpha-value), solid color autodetected from the background image(to make the colors match).

In this initial implementation, there is one background-provider for a color with an alpha-value. This might also be a nice way to customize themes even if composition is enabled, because it can be used to just reduce the transparency, and tint the theme into a user-chosen direction.

This isn't ready and doesn't have a user-interface, I'm mainly posting this for review to check whether the general approach is accepted.

To try it out, add something like:
frameBackgroundColor=#ff0000
frameBackgroundColorAlpha=255
Into the [Theme] section of the ~/.kde4/share/apps/plasmarc file.

About the implementation:
The main problem is identifying the specific frames that are intended to run as separate windows. I've done that using some simple string-matching, and it worked well in all my tries.


Diffs
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  trunk/KDE/kdelibs/plasma/CMakeLists.txt 953288 
  trunk/KDE/kdelibs/plasma/framebackgroundprovider.h PRE-CREATION 
  trunk/KDE/kdelibs/plasma/framebackgroundprovider.cpp PRE-CREATION 
  trunk/KDE/kdelibs/plasma/framesvg.cpp 953288 
  trunk/KDE/kdelibs/plasma/private/framesvg_p.h 953288 
  trunk/KDE/kdelibs/plasma/theme.h 953288 
  trunk/KDE/kdelibs/plasma/theme.cpp 953288 

Diff: http://reviewboard.kde.org/r/591/diff


Testing
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Thanks,

David