Merge some code from hexrgb.el into color.el.
* lisp/color.el (color-name-to-rgb): Rename from color-rgb->normalize. Autoload. Add optional arg FRAME, and pass it to color-values. (color-complement): Caller changed. Doc fix. (color-gradient): Rewrite for better clarity and efficiency. (color-rgb-to-hex): Rename from color-rgb->hex. (color-rgb-to-hsv): Rename from color-rgb->hsv. Force hue and saturation to zero if the value is too small. (color-rgb-to-hsl): Rename from color-rgb->hsl. (color-srgb-to-xyz): Rename from color-srgb->xyz. Doc fix. (color-xyz-to-srgb): Rename from color-xyz->srgb. Doc fix. (color-xyz-to-lab): Rename from color-xyz->lab. Doc fix. (color-lab-to-xyz): Rename from color-lab->xyz. Doc fix. (color-lab-to-srgb): Rename from color-lab->srgb. Doc fix. (color-cie-de2000): Doc fix. * lisp/facemenu.el (color-rgb-to-hsv): Deleted; use the version in lisp/color.el instead. (list-colors-sort-key, list-colors-print): Use color-normalized-values. * lisp/faces.el (color-values): Use co...
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