add processBGColor

image.go

@@ -2,18 +2,22 @@ package main
 
 import (
 	"bytes"
+	"fmt"
 	"image"
 	_ "image/gif"
 	"image/jpeg"
 	_ "image/png"
 	"os"
+	"strconv"
 
 	"golang.org/x/image/draw"
 )
 
 func retrieveArt(path string) ([]byte, error) {
 
-	//streaming PC is primarily flacs, so flacs first, then mp3s, then check for covers in folder, finally just use a default image if none of the above exist.
+	//streaming PC is primarily flacs, so flacs first, then mp3s, then check
+	//for covers in folder, finally just use a default image if none of the
+	//above exist.
 	switch {
 	case hasFlacTrackArt(path):
 		return getFlacArt(path)
@@ -57,3 +61,35 @@ func writeArtFile(orig []byte) (string, error) {
 	}
 	return pathOut, nil
 }
+
+func processBGColor(path string) (float64, error) {
+	imageSize := 1
+	f, err := os.ReadFile(path)
+	if err != nil {
+		return 0, err
+	}
+	imgBuff := bytes.NewBuffer(f)
+	imgOrig, _, err := image.Decode(imgBuff)
+	if err != nil {
+		return 0, err
+	}
+
+	img := image.NewRGBA(image.Rect(0, 0, imageSize, imageSize))
+
+	draw.ApproxBiLinear.Scale(img, img.Rect, imgOrig, imgOrig.Bounds(), draw.Over, nil)
+
+	r, g, b, _ := img.At(0, 0).RGBA()
+	// convert from 32 bit color back into 8 bit color
+	// this is to undo x |= x << 8 each value goes through
+	// trust me it works bro. bro it works.
+	r &= r >> 8
+	g &= g >> 8
+	b &= b >> 8
+	//a &= a >> 8
+	// 25 becomes 0x19, 36 is close to 10% of 256
+	fmt.Printf("0x%02x %02x %02x %02x\n", 25, r, g, b)
+	// it wants it abgr for some reason
+	rgba := fmt.Sprintf("0x%02x%02x%02x%02x", 25, b, g, r)
+	rgbaInt, err := strconv.ParseInt(rgba, 0, 64)
+	return float64(rgbaInt), err
+}