LoadColor

The color of a load list's row: one scale for every channel, and the mix of the channels by their real size (monitor-load-color §MHD-1 to §MHD-3).

Declared in src/libs/libwidgets/components/visualization/LoadColor.hpp.

Detailed description

A channel has a color and a share. A share of 1 is one full unit: one core's worth for a process. The machine share is the share that means the whole machine: the core count for a process.

Up to a share of 1, the channel is its color at an opacity equal to its share.
Above 1, it is opaque, and its color moves toward the white end in OKLab by equal steps per doubling. It reaches the white end at the machine share.
The channels mix in OKLab, each weighted by its unclamped share, so the larger load sets the hue. The opacity is the largest share, at most 1.
A share that is not a number is a gap: the pixel is the no-data color, never the coldest value.

The white end is the owner's: it resolves white through its palette, so the mix slider tints the top of the scale too (§MHD-1, R4).

Each channel keeps a table of 256 OKLab steps from its color to the white end (§MHD-3). The table is made again when a channel color or the white end changes, never on a tick. The machine share sets only the divisor of the step. So a tick costs one log2 per channel above one full share and no other transcendental call: the sRGB conversion back is a lookup too.

Pure: no widget and no painter.

The colors of a chart series come from ChartColorPalette.