grokify/mogo

package imageutil

import (
    "image"
    "image/color"

    "github.com/grokify/mogo/image/colors"
)

func RowsFilteredColor(img image.Image, c color.Color, cmore ...color.Color) []int {
    minPt := img.Bounds().Min
    maxPt := img.Bounds().Max
    rows := []int{}

    cmore = append([]color.Color{c}, cmore...)
    for y := minPt.Y; y <= maxPt.Y; y++ {
        for x := minPt.X; x <= maxPt.X; x++ {
            for _, ci := range cmore {
                if colors.ColorToHex(img.At(x, y)) == colors.ColorToHex(ci) {
                    rows = append(rows, y)
                    continue
                }
            }
        }
    }
    return rows
}

func ColsFilteredColor(img image.Image, c ...color.Color) []int {
    cols := []int{}
    if len(c) == 0 {
        return cols
    }
    clrs := colors.Colors(c)

    minPt := img.Bounds().Min
    maxPt := img.Bounds().Max
COL:
    for x := minPt.X; x <= maxPt.X; x++ {
        for y := minPt.Y; y <= maxPt.Y; y++ {
            cx := img.At(x, y)
            if !clrs.In(cx) {
                continue COL
            }
        }
        cols = append(cols, x)
    }
    return cols
}