Module palette 

Dominant-colour palettes, matching Eagle’s palettes field.

Eagle runs modified median cut quantization (MMCQ, the algorithm behind color-thief) on a copy of the image at most 360 px wide, then turns box populations into percentages. This port keeps Eagle’s exact control flow, quirks included, so the same pixels give the same palette:

• the colour bounds are tracked with if min .. else if max, so a channel’s first value only ever sets its minimum;
• each of the two splitting passes stops after 5 iterations, which caps a palette at about 11 colours;
• boxes are kept in a lazily sorted queue whose tie order matters.

Constants

ANALYSIS_WIDTH

Width of the image Eagle analyses.

Functions

analysis_image

The image Eagle hands to the quantizer: img scaled down (never up) to at most ANALYSIS_WIDTH wide, keeping the aspect ratio.

extract

Extracts the palette Eagle would store for img.

from_rgba

Extracts a palette from an RGBA buffer that is already analysis-sized.

refresh_source

The picture Eagle analyses when a palette is refreshed: the original when the item has noThumbnail (a small SVG is rendered at its own size), otherwise the thumbnail file. None when there is nothing to read.