Review Request 129807: proposal: add ksvg2ico

[René J.V. Bertin]

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https://git.reviewboard.kde.org/r/129807/
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Review request for KDE Frameworks, kdewin and Christoph Feck.


Repository: kiconthemes


Description
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Recently I committed a few changes to `ecm_add_app_icon` that make use of the fact that KIconThemes includes a `ksvg2icns` utility, making it possible to generate an application icon from an SVG file instead of from a series of PNG files. 

With the present patch I propose to add an updated and partly rewritten version of the ageing `svg2ico` tool from the KDEWin project to KIconThemes. The goal is to have a proper and up-to-date tool to generate application icons from SVG on MS Windows too.

I considered proposing it to KDEWin instead, but in the end I liked the idea better to provide icon conversion utilities for Mac and Windows with a framework, where they might also serve in a less KDE-centric context (and cross-platform development).
I also played with the idea of integrating the png2ico step into the tool, but noticed during testing that Matthias Benkmann's png2ico supports input sizes up to 248x248 while KDEWin's png2ico is currently limited at 48x48 or maybe even 32x32. Lacking a MSWin development system I'm not volunteering to update that code.


Diffs
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  src/CMakeLists.txt efba9e6 
  src/tools/ksvg2ico/CMakeLists.txt PRE-CREATION 
  src/tools/ksvg2ico/ksvg2ico.cpp PRE-CREATION 

Diff: https://git.reviewboard.kde.org/r/129807/diff/


Testing
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On Mac OS X 10.9 with Qt 5.7.1 and KF5 5.29.0 .


File Attachments
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.ico file generated from sc-apps-calligrakarbon.svgz using ksvg2ico with Benkmann's png2ico
  https://git.reviewboard.kde.org/media/uploaded/files/2017/01/11/aa0973dc-1be8-4d36-82dc-8f7baa053fee__apps-calligrakarbon.ico


Thanks,

René J.V. Bertin

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