From 09126c915e0f410fddfee14239589fad250ea712 Mon Sep 17 00:00:00 2001
From: Martin Lehoux <martin@lehoux.net>
Date: Sun, 5 Apr 2020 23:05:34 -0700
Subject: feat - Use PNG encoder

---
 image.go | 22 ++++++++++++----------
 main.go  |  2 +-
 2 files changed, 13 insertions(+), 11 deletions(-)

diff --git a/image.go b/image.go
index df9039a..08d32a7 100644
--- a/image.go
+++ b/image.go
@@ -1,7 +1,9 @@
 package main
 
 import (
-	"fmt"
+	"image"
+	"image/color"
+	"image/png"
 	"os"
 )
 
@@ -15,15 +17,15 @@ type Frame [Height][Width]Pixel
 
 // Save saves frame to PPM file
 func (frame Frame) Save(filename string) {
-	f, err := os.Create(filename)
-	if err != nil {
-		panic(nil)
-	}
-	defer f.Close()
-	f.WriteString(fmt.Sprintf("P3\n%d %d\n255\n", Width, Height))
-	for _, row := range frame {
-		for _, pixel := range row {
-			f.WriteString(fmt.Sprintf("%d %d %d ", pixel.r, pixel.g, pixel.b))
+	upLeft, bottomRight := image.Point{0, 0}, image.Point{Width, Height}
+	image := image.NewRGBA(image.Rectangle{upLeft, bottomRight})
+	for x, row := range frame {
+		for y, pixel := range row {
+			color := color.RGBA{uint8(pixel.r), uint8(pixel.g), uint8(pixel.b), 0xff}
+			image.Set(y, x, color)
 		}
 	}
+	f, _ := os.Create(filename)
+	defer f.Close()
+	png.Encode(f, image)
 }
diff --git a/main.go b/main.go
index 7211f8e..7042d21 100644
--- a/main.go
+++ b/main.go
@@ -68,7 +68,7 @@ func main() {
 		}
 		bar.Add(1)
 	}
-	frame.Save("img.ppm")
+	frame.Save("img.png")
 	// frame.Save(fmt.Sprintf("frames/frame_%06d.ppm", k))
 }
 
-- 
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