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- swap 3rd and 4th parameter of fl_contrast()
- change 'Fl_Fontsize fs' to a neutral 'int size' parameter
- clarify documentation of fl_contrast_level() and that different
contrast algorithms use different level values
- clarify that level 39 for the CIELAB mode results in "sufficient"
contrast, i.e. /readable/ text which is the only intention of
fl_contrast().
Reasoning: swapping the arguments looks more natural, i.e. the context
before another argument (size) is what one would usually expect. Since
the 'size' argument doesn't have be a font size, making it a simple
'int size' is more flexible and correct for future extensions.
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- src/fl_contrast.cxx:
- FL_CONTRAST_LEGACY: reset black/white threshold from 55 to 50
- FL_CONTRAST_CIELAB: change default contrast level from 55 to 39
- test/contrast.cxx:
- set default contrast mode to CIELAB
- add "random color" button to test random foreground colors (text)
- slightly increase terminal size
- make the Fl_Terminal widget the resizable() of the window
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- Add internal fl_contrast_cielab() as the new default.
- Keep old function as internal fl_contrast_legacy().
- Add fl_contrast_mode() to switch between fl_contrast() functions.
- Add fl_contrast_level() to fine tune fl_contrast() per mode.
- Add option to register and use a custom contrast function.
- Add test/contrast.cxx test program.
- Move all fl_contrast() related code to a new file src/fl_contrast.cxx.
- Add fl_lightness() convenience function for perceived lightness.
- Add fl_luminance() convenience function for physical luminance.
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