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move data_uri

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This commit is contained in:
Jehiah Czebotar
2017-05-07 15:28:51 -04:00
parent 37e22285f7
commit 8d68050c5e
2 changed files with 26 additions and 32 deletions
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26
src/cmd/open_speed_data/data_uri.go Normal file
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@@ -0,0 +1,26 @@
package main
import (
"bytes"
"encoding/base64"
"html/template"
"image"
"image/png"
)
func dataImg(img image.Image) (template.URL, error) {
out := new(bytes.Buffer)
// We now encode the image we created to the buffer
err := png.Encode(out, img)
if err != nil {
return "", err
}
return dataImgFromBytes(out.Bytes()), nil
}
// returns a data:image/png
func dataImgFromBytes(b []byte) template.URL {
base64Img := base64.StdEncoding.EncodeToString(b)
return template.URL("data:image/png;base64," + base64Img)
}

32
src/cmd/open_speed_data/templates.go
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@@ -1,43 +1,11 @@
package main
import (
"bytes"
"encoding/base64"
"html/template"
"image"
"image/png"
)
var Template *template.Template
func dataImg(img image.Image) (template.URL, error) {
out := new(bytes.Buffer)
// We now encode the image we created to the buffer
err := png.Encode(out, img)
if err != nil {
return "", err
}
return dataImgFromBytes(out.Bytes()), nil
}
func dataImgFromBytes(b []byte) template.URL {
// This now takes a []byte of the buffer and base64 encodes it to a string
// Never needing to create the image file all done in memory
base64Img := base64.StdEncoding.EncodeToString(b)
//And now you can see the magic happen.
// Go ahead and run it then take the output and copy/paste it in your
// browser's URL bar, and you'll see your image.
return template.URL("data:image/png;base64," + base64Img)
}
func init() {
Template = template.Must(template.New("webpage").Funcs(template.FuncMap{
"DataURI": dataImg,
}).Parse(tpl))
}
const tpl = `
<!DOCTYPE html>
<html>