From ff68336c1bd36d4f946ce5372be1cd4e8d10cc4b Mon Sep 17 00:00:00 2001
From: velvettear <daniel.sommer@velvettear.de>
Date: Fri, 24 Nov 2023 10:10:39 +0100
Subject: [PATCH] calculate sleep time for slideshow interval more accurately

---
 internal/slideshow/slideshow.go | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/internal/slideshow/slideshow.go b/internal/slideshow/slideshow.go
index 873ce02..17ee643 100644
--- a/internal/slideshow/slideshow.go
+++ b/internal/slideshow/slideshow.go
@@ -21,9 +21,10 @@ var previousImage string
 func Start() {
 	loggo.Info("starting the image slideshow...", "interval: "+strconv.FormatFloat(config.Interval.Seconds(), 'f', 0, 64)+" seconds")
 	var sleepTime time.Duration
-	var scaleTime time.Duration
+	var loopTime time.Duration
 	scaleImages := config.IsResolutionSet()
 	for {
+		loopTimestamp := time.Now()
 		var image string
 		var palette []color.Color
 		var data []byte
@@ -34,18 +35,17 @@ func Start() {
 			}
 		}
 		if scaleImages {
-			scaleTimestamp := time.Now()
 			tmp, error := scale(image)
 			if error != nil {
 				loggo.Error("encountered an error scaling an image", "image: "+image, error.Error())
 				continue
 			}
 			data = tmp
-			scaleTime = time.Since(scaleTimestamp)
 			palette, _ = getColorPaletteRaw(data)
 		} else {
 			palette, _ = getColorPalette(image)
 		}
+		loopTime = time.Since(loopTimestamp)
 		if sleepTime > 0 {
 			loggo.Debug("sleeping for " + strconv.FormatInt(sleepTime.Milliseconds(), 10) + "ms before next image will be displayed...")
 			time.Sleep(sleepTime)
@@ -64,7 +64,7 @@ func Start() {
 			}
 			loggo.Info("set new background image", "image: "+image)
 		}
-		sleepTime = config.Interval - scaleTime
+		sleepTime = config.Interval - loopTime
 	}
 }