Refactor display iteration/state and harden collector runtime

1 files changed, 58 insertions, 0 deletions

diff --git a/internal/display/mem.go b/internal/display/mem.go
new file mode 100644
index 0000000..7a814d8
--- /dev/null
+++ b/internal/display/mem.go
@@ -0,0 +1,58 @@
+package display
+
+import (
+	"codeberg.org/snonux/loadbars/internal/constants"
+	"codeberg.org/snonux/loadbars/internal/stats"
+	"github.com/veandco/go-sdl2/sdl"
+)
+
+func drawMemBarSmoothed(renderer *sdl.Renderer, h *stats.HostStats, smoothed *struct{ ramUsed, swapUsed float64 }, factor float64, barW int32, x, y, barH int32) {
+	renderer.SetDrawColor(constants.Black.R, constants.Black.G, constants.Black.B, 255)
+	renderer.FillRect(&sdl.Rect{X: x, Y: y, W: barW, H: barH})
+	if h.Mem == nil {
+		return
+	}
+	var targetRam, targetSwap float64
+	if memTotal := h.Mem["MemTotal"]; memTotal > 0 {
+		targetRam = 100 - 100*float64(h.Mem["MemFree"])/float64(memTotal)
+		if targetRam < 0 {
+			targetRam = 0
+		}
+		if targetRam > 100 {
+			targetRam = 100
+		}
+	}
+	if swapTotal := h.Mem["SwapTotal"]; swapTotal > 0 {
+		targetSwap = 100 - 100*float64(h.Mem["SwapFree"])/float64(swapTotal)
+		if targetSwap < 0 {
+			targetSwap = 0
+		}
+		if targetSwap > 100 {
+			targetSwap = 100
+		}
+	}
+	smoothed.ramUsed += (targetRam - smoothed.ramUsed) * factor
+	smoothed.swapUsed += (targetSwap - smoothed.swapUsed) * factor
+
+	halfW := barW / 2
+	pxPerPct := float64(barH) / 100.0
+	ramUsedH := int32(smoothed.ramUsed * pxPerPct)
+	if ramUsedH > 0 {
+		renderer.SetDrawColor(constants.DarkGrey.R, constants.DarkGrey.G, constants.DarkGrey.B, 255)
+		renderer.FillRect(&sdl.Rect{X: x, Y: y + barH - ramUsedH, W: halfW, H: ramUsedH})
+	}
+	if ramFreeH := barH - ramUsedH; ramFreeH > 0 {
+		renderer.SetDrawColor(constants.Black.R, constants.Black.G, constants.Black.B, 255)
+		renderer.FillRect(&sdl.Rect{X: x, Y: y, W: halfW, H: ramFreeH})
+	}
+
+	swapUsedH := int32(smoothed.swapUsed * pxPerPct)
+	if swapUsedH > 0 {
+		renderer.SetDrawColor(constants.Grey.R, constants.Grey.G, constants.Grey.B, 255)
+		renderer.FillRect(&sdl.Rect{X: x + halfW, Y: y + barH - swapUsedH, W: halfW, H: swapUsedH})
+	}
+	if swapFreeH := barH - swapUsedH; swapFreeH > 0 {
+		renderer.SetDrawColor(constants.Black.R, constants.Black.G, constants.Black.B, 255)
+		renderer.FillRect(&sdl.Rect{X: x + halfW, Y: y, W: halfW, H: swapFreeH})
+	}
+}