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renderservice.go
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/
renderservice.go
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package rest
import (
"bufio"
"bytes"
lib "github.com/johnny-morrice/godelbrot"
"github.com/johnny-morrice/godelbrot/process"
"io"
"log"
"strings"
)
type renderbuffers struct {
png bytes.Buffer
info bytes.Buffer
nextinfo bytes.Buffer
report bytes.Buffer
}
func (rb *renderbuffers) logReport() {
sc := bufio.NewScanner(&rb.report)
for sc.Scan() {
err := sc.Err()
if err != nil {
log.Printf("Error while printing error (omg!): %v", err)
}
log.Println(sc.Text())
}
}
func (rb *renderbuffers) input(info *lib.Info) error {
return lib.WriteInfo(&rb.info, info)
}
// renderservice renders fractals
type renderservice struct {
s sem
}
// makeRenderService creates a render service that allows at most `concurrent` concurrent tasks.
func makeRenderservice(concurrent uint) renderservice {
rs := renderservice{}
rs.s = semaphor(concurrent)
return rs
}
// render a fractal into the renderbuffers
func (rs renderservice) render(rbuf *renderbuffers, zoomArgs []string) error {
rs.s.acquire(1)
var err error
if zoomArgs == nil || len(zoomArgs) == 0 {
debugf("Render in progress")
tee := io.TeeReader(&rbuf.info, &rbuf.nextinfo)
err = process.Render(tee, &rbuf.png, &rbuf.report)
debugf("Render done")
} else {
debugf("ZoomRender in progress: %v", strings.Join(zoomArgs, " "))
next, zerr := process.ZoomRender(&rbuf.info, &rbuf.png, &rbuf.report, zoomArgs)
err = zerr
if err == nil {
_, err = io.Copy(&rbuf.nextinfo, next)
}
debugf("ZoomRender done")
}
rs.s.release(1)
return err
}