SVG support in preset icons and MapCSS

[skippern@…]

It is desirable if support for SVG icons could be added into both the presets, and to the MapCSS renderer. I am writing my own presets and mapcss but have to convert all the icons to png bitmaps, instead of using the scalable power of SVG, I have several of the desired icons in SVG, and have to convert them to png of various resolutions to get a good rendering.

[stoecker]

​SVGSalamander seems helpful for this task.

[bastiK]

Replying to stoecker:

​SVGSalamander seems helpful for this task.

svnSalamander-tiny.jar is 288kB; removing the Animation and unnecessary GUI classes, I end up with 185kB. Do you think it is worth to add this lib to JOSM core? I'd vote yes.

[stoecker]

Can we add the Java files? This would mean make process would include only really required files. Maybe that drops space again.

[bastiK]

Replying to stoecker:

Can we add the Java files? This would mean make process would include only really required files. Maybe that drops space again.

Removing the animation classes requires a bit of patching, so we probably have to keep the sources somewhere anyway. But I think 185kB (compressed) is the absolute minimum.

[bastiK]

In [4256/josm]:

see #6560 - basic svg support, includes kitfox svgsalamander, r 98, patched

[bastiK]

At the moment, SVGs are rendered to a raster image at their normal size.

TODO:

• api to get a scaled version of the SVG
• render it directly on the Graphics2D of the map canvas (?)

[bastiK]

In [4271/josm]:

extend image caching and add support for scaled svg images (see #6560)

[bastiK]

In [4272/josm]:

mapcss: proper support for scaled icons (fixes #6560)