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Use github.com/bamiaux/rez instead of github.com/nfnt/resize for resampling the pyramid tiles. It is much faster but needs some testing.

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This commit is contained in:
Sascha L. Teichmann 2015-12-25 22:07:54 +01:00
parent 6ae5936de9
commit f658d12641
3 changed files with 34 additions and 12 deletions
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23
cmd/mtseeder/pyramid.go
View File

@ -18,7 +18,7 @@ import (
"bitbucket.org/s_l_teichmann/mtsatellite/common"
"github.com/nfnt/resize"
"github.com/bamiaux/rez"
)
func findMaxDir(files []os.FileInfo) (min, max int) {
@ -155,7 +155,7 @@ var dps = [4]image.Point{
image.Pt(256, 256),
image.Pt(256, 0)}
func fuseTile(scratch *image.RGBA, job *pyramidJob) error {
func fuseTile(scratch, resized *image.RGBA, conv rez.Converter, job *pyramidJob) error {
for i, path := range job.src {
@ -167,7 +167,9 @@ func fuseTile(scratch *image.RGBA, job *pyramidJob) error {
draw.Draw(scratch, r, img, sr.Min, draw.Src)
}
resized := resize.Resize(256, 256, scratch, resize.Lanczos3)
if err := conv.Convert(resized, scratch); err != nil {
return err
}
log.Printf("Writing pyramid tile '%s'.\n", job.dst)
@ -177,9 +179,22 @@ func fuseTile(scratch *image.RGBA, job *pyramidJob) error {
func fuseTiles(jobs chan pyramidJob, done *sync.WaitGroup) {
defer done.Done()
scratch := image.NewRGBA(image.Rect(0, 0, 512, 512))
resized := image.NewRGBA(image.Rect(0, 0, 256, 256))
cfg, err := rez.PrepareConversion(resized, scratch)
if err != nil {
log.Printf("WARN: cannot prepare rescaling: %s\n", err)
return
}
conv, err := rez.NewConverter(cfg, common.ResizeFilter)
if err != nil {
log.Printf("WARN: Cannot create image converter: %s\n", err)
return
}
for job := range jobs {
if err := fuseTile(scratch, &job); err != nil {
if err := fuseTile(scratch, resized, conv, &job); err != nil {
log.Printf("WARN: Writing image failed: %s\n", err)
}
}

18
cmd/mtwebmapper/tilesupdater.go
View File

@ -6,7 +6,6 @@ package main
import (
"encoding/json"
"fmt"
"image"
"image/draw"
"log"
@ -17,7 +16,7 @@ import (
"strings"
"sync"
"github.com/nfnt/resize"
"github.com/bamiaux/rez"
"bytes"
@ -215,9 +214,10 @@ func (tu *tileUpdater) doUpdates() {
func updatePyramidTiles(level int, baseDir string, jobs chan xzm, done *sync.WaitGroup) {
defer done.Done()
scratch := image.NewRGBA(image.Rect(0, 0, 256, 256))
resized := image.NewRGBA(image.Rect(0, 0, 128, 128))
for job := range jobs {
if err := updatePyramidTile(scratch, level, baseDir, job); err != nil {
if err := updatePyramidTile(scratch, resized, level, baseDir, job); err != nil {
log.Printf("Updating pyramid tile failed: %s\n", err)
}
}
@ -243,7 +243,7 @@ var ofs = [4][2]int{
var windowSize = image.Pt(128, 128)
func updatePyramidTile(scratch *image.RGBA, level int, baseDir string, j xzm) error {
func updatePyramidTile(scratch, resized *image.RGBA, level int, baseDir string, j xzm) error {
var orig image.Image
@ -251,8 +251,9 @@ func updatePyramidTile(scratch *image.RGBA, level int, baseDir string, j xzm) er
baseDir,
strconv.Itoa(level),
strconv.Itoa(int(j.P.X)),
fmt.Sprintf("%d.png", j.P.Z))
strconv.Itoa(int(j.P.Z))+".png")
sr := resized.Bounds()
for i := uint16(0); i < 4; i++ {
if j.Mask&(1<<i) != 0 {
//log.Printf("level %d: modified %d\n", level, i)
@ -264,10 +265,11 @@ func updatePyramidTile(scratch *image.RGBA, level int, baseDir string, j xzm) er
strconv.Itoa(bx+o[0]),
strconv.Itoa(bz+o[1])+".png")
img := common.LoadPNG(path)
img = resize.Resize(128, 128, img, resize.Lanczos3)
sr := img.Bounds()
if err := rez.Convert(resized, img, common.ResizeFilter); err != nil {
return err
}
r := sr.Sub(sr.Min).Add(dps[i])
draw.Draw(scratch, r, img, sr.Min, draw.Src)
draw.Draw(scratch, r, resized, sr.Min, draw.Src)
} else {
// Load lazy
if orig == nil {

5
common/image.go
View File

@ -15,8 +15,13 @@ import (
"strconv"
"sync"
"time"
"github.com/bamiaux/rez"
)
// ResizeFilter is used to scale down the pyramid tiles.
var ResizeFilter = rez.NewLanczosFilter(3)
var rrand uint32
var rrandmu sync.Mutex