mtwebmapper: First version of pyramid tile updater. Needs testing.

cmd/mtseeder/pyramid.go

@@ -5,11 +5,9 @@
 package main
 
 import (
-	"bufio"
 	"fmt"
 	"image"
 	"image/draw"
-	"image/png"
 	"io/ioutil"
 	"log"
 	"math"
@@ -158,7 +156,7 @@ var dps = [4]image.Point{
 	image.Pt(256, 256),
 	image.Pt(256, 0)}
 
-func fuseTile(scratch *image.RGBA, job *pyramidJob) (err error) {
+func fuseTile(scratch *image.RGBA, job *pyramidJob) error {
 
 	for i, path := range job.src {
 
@@ -172,21 +170,7 @@ func fuseTile(scratch *image.RGBA, job *pyramidJob) (err error) {
 
 	resized := resize.Resize(256, 256, scratch, resize.Lanczos3)
 
-	var outFile *os.File
-	if outFile, err = os.Create(job.dst); err != nil {
-		return
-	}
-
-	out := bufio.NewWriter(outFile)
-
-	if err = png.Encode(out, resized); err != nil {
-		outFile.Close()
-		return
-	}
-
-	out.Flush()
-	err = outFile.Close()
-	return
+	return common.SaveAsPNG(job.dst, resized)
 }
 
 func fuseTiles(jobs chan pyramidJob, done *sync.WaitGroup) {