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H. G. Muller wrote on Fri, Jul 24, 2020 07:43 PM UTC:

Let me move this discussion to a more applicable thread. Are you changing the color after you rendered it as PGN, through a flood fill? That would indeed not work, because the anti-aliasing would produce all kind of average shades where the color touches the outline, some very close to white but not exactly so, and the flood fill would not capture those. You would have to change the color when it is still SVG.

The way I do it in the renderer is that I load the SVG in a memory buffer, search it for #FFFFF (or whatever I know the original color to be), and substitute that for the desired color, (it is a text file!) before I pass it to the routine that renders it as a bitmap. And then use a routine to save bitmaps as PNG.

I suppose it should be very little work to change the renderer (which now parses CGI query strings handed to it as 'environment' variables) to take its requests from the normal (argc, argv) command-line arguments (or even hard-code what color / size / orientation we want), and then run it in a shell script to render every SVG file. But I guess we should be a bit selective in what we render; we probably only want rotated versions of the orthodox pieces. And I am not sure whether we would want to have complete alfaerie sets in red or green.


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