From 5df3cf97316b3f91ea31389267e1d56949caacaa Mon Sep 17 00:00:00 2001
From: esimov <esimovaq@yahoo.com>
Date: Sat, 23 Oct 2021 07:35:27 +0300
Subject: [PATCH] wasm: small changes

---
 wasm/canvas/canvas.go     |  5 +++--
 wasm/detector/detector.go | 16 +++++++++-------
 2 files changed, 12 insertions(+), 9 deletions(-)

diff --git a/wasm/canvas/canvas.go b/wasm/canvas/canvas.go
index f396f4d..1627223 100644
--- a/wasm/canvas/canvas.go
+++ b/wasm/canvas/canvas.go
@@ -90,7 +90,7 @@ func (c *Canvas) Render() error {
 			js.CopyBytesToGo(data, uint8Arr)
 			pixels := c.rgbaToGrayscale(data)
 
-			// Restore the data slice to its default values to avoid unnecessary memory allocation.
+			// Empty the data slice to avoid unnecessary memory allocation.
 			// Otherwise, the GC won't clean up the memory address allocated by this slice
 			// and the memory will keep up increasing by each iteration.
 			data = make([]byte, len(data))
@@ -102,11 +102,12 @@ func (c *Canvas) Render() error {
 		}()
 		return nil
 	})
+	// Release renderer to free up resources.
 	defer c.renderer.Release()
+
 	c.window.Call("requestAnimationFrame", c.renderer)
 	c.detectKeyPress()
 	<-c.done
-
 	return nil
 }
 
diff --git a/wasm/detector/detector.go b/wasm/detector/detector.go
index 783c854..966c0c4 100644
--- a/wasm/detector/detector.go
+++ b/wasm/detector/detector.go
@@ -12,6 +12,8 @@ type FlpCascade struct {
 	error
 }
 
+const perturb = 63
+
 var (
 	cascade          []byte
 	puplocCascade    []byte
@@ -79,7 +81,7 @@ func (d *Detector) DetectLeftPupil(results []int) *pigo.Puploc {
 		Row:      results[0] - int(0.085*float32(results[2])),
 		Col:      results[1] - int(0.185*float32(results[2])),
 		Scale:    float32(results[2]) * 0.4,
-		Perturbs: 63,
+		Perturbs: perturb,
 	}
 	leftEye := puplocClassifier.RunDetector(*puploc, *imgParams, 0.0, false)
 	if leftEye.Row > 0 && leftEye.Col > 0 {
@@ -94,7 +96,7 @@ func (d *Detector) DetectRightPupil(results []int) *pigo.Puploc {
 		Row:      results[0] - int(0.085*float32(results[2])),
 		Col:      results[1] + int(0.185*float32(results[2])),
 		Scale:    float32(results[2]) * 0.4,
-		Perturbs: 63,
+		Perturbs: perturb,
 	}
 	rightEye := puplocClassifier.RunDetector(*puploc, *imgParams, 0.0, false)
 	if rightEye.Row > 0 && rightEye.Col > 0 {
@@ -112,13 +114,13 @@ func (d *Detector) DetectLandmarkPoints(leftEye, rightEye *pigo.Puploc) [][]int
 
 	for _, eye := range eyeCascades {
 		for _, flpc := range flpcs[eye] {
-			flp := flpc.GetLandmarkPoint(leftEye, rightEye, *imgParams, 63, false)
+			flp := flpc.GetLandmarkPoint(leftEye, rightEye, *imgParams, perturb, false)
 			if flp.Row > 0 && flp.Col > 0 {
 				det[idx] = append(det[idx], flp.Col, flp.Row, int(flp.Scale))
 			}
 			idx++
 
-			flp = flpc.GetLandmarkPoint(leftEye, rightEye, *imgParams, 63, true)
+			flp = flpc.GetLandmarkPoint(leftEye, rightEye, *imgParams, perturb, true)
 			if flp.Row > 0 && flp.Col > 0 {
 				det[idx] = append(det[idx], flp.Col, flp.Row, int(flp.Scale))
 			}
@@ -128,14 +130,14 @@ func (d *Detector) DetectLandmarkPoints(leftEye, rightEye *pigo.Puploc) [][]int
 
 	for _, mouth := range mouthCascade {
 		for _, flpc := range flpcs[mouth] {
-			flp := flpc.GetLandmarkPoint(leftEye, rightEye, *imgParams, 63, false)
+			flp := flpc.GetLandmarkPoint(leftEye, rightEye, *imgParams, perturb, false)
 			if flp.Row > 0 && flp.Col > 0 {
 				det[idx] = append(det[idx], flp.Col, flp.Row, int(flp.Scale))
 			}
 			idx++
 		}
 	}
-	flp := flpcs["lp84"][0].GetLandmarkPoint(leftEye, rightEye, *imgParams, 63, true)
+	flp := flpcs["lp84"][0].GetLandmarkPoint(leftEye, rightEye, *imgParams, perturb, true)
 	if flp.Row > 0 && flp.Col > 0 {
 		det[idx] = append(det[idx], flp.Col, flp.Row, int(flp.Scale))
 	}
@@ -153,7 +155,7 @@ func (d *Detector) clusterDetection(pixels []uint8, width, height int) []pigo.De
 	}
 	cParams := pigo.CascadeParams{
 		MinSize:     200,
-		MaxSize:     640,
+		MaxSize:     480,
 		ShiftFactor: 0.1,
 		ScaleFactor: 1.1,
 		ImageParams: *imgParams,