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resources: Cache Exif data to disk

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```bash
name                        old time/op    new time/op    delta
ImageExif/Cold_cache-4         312µs ±28%     355µs ± 7%     ~     (p=0.343 n=4+4)
ImageExif/Cold_cache,_10-4     479µs ± 6%     546µs ± 0%  +13.91%  (p=0.029 n=4+4)
ImageExif/Warm_cache-4         272µs ± 1%      81µs ± 5%  -70.30%  (p=0.029 n=4+4)

name                        old alloc/op   new alloc/op   delta
ImageExif/Cold_cache-4         151kB ± 0%     161kB ± 0%   +6.46%  (p=0.029 n=4+4)
ImageExif/Cold_cache,_10-4     179kB ± 0%     189kB ± 0%   +5.49%  (p=0.029 n=4+4)
ImageExif/Warm_cache-4         151kB ± 0%      13kB ± 0%  -91.52%  (p=0.029 n=4+4)

name                        old allocs/op  new allocs/op  delta
ImageExif/Cold_cache-4         1.03k ± 0%     1.21k ± 0%  +17.78%  (p=0.029 n=4+4)
ImageExif/Cold_cache,_10-4     1.65k ± 0%     1.83k ± 0%  +11.09%  (p=0.029 n=4+4)
ImageExif/Warm_cache-4         1.03k ± 0%     0.28k ± 0%  -72.40%  (p=0.029 n=4+4)
```

Fixes #6291
This commit is contained in:
Bjørn Erik Pedersen
2019-09-01 17:27:21 +02:00
parent de9cbf6195
commit ce47c21a29
7 changed files with 172 additions and 41 deletions
Download Patch File Download Diff File Expand all files Collapse all files

39
resources/images/exif/exif.go
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@@ -24,6 +24,8 @@ import (
"unicode"
"unicode/utf8"
"github.com/bep/tmc"
_exif "github.com/rwcarlsen/goexif/exif"
"github.com/rwcarlsen/goexif/tiff"
)
@@ -31,10 +33,10 @@ import (
const exifTimeLayout = "2006:01:02 15:04:05"
type Exif struct {
Lat float64
Long float64
Date time.Time
Values map[string]interface{}
Lat float64
Long float64
Date time.Time
Tags Tags
}
type Decoder struct {
@@ -139,7 +141,7 @@ func (d *Decoder) Decode(r io.Reader) (ex *Exif, err error) {
return
}
ex = &Exif{Lat: lat, Long: long, Date: tm, Values: walker.vals}
ex = &Exif{Lat: lat, Long: long, Date: tm, Tags: walker.vals}
return
}
@@ -240,3 +242,30 @@ func nullString(in []byte) string {
return ""
}
var tcodec *tmc.Codec
func init() {
var err error
tcodec, err = tmc.New()
if err != nil {
panic(err)
}
}
type Tags map[string]interface{}
func (v *Tags) UnmarshalJSON(b []byte) error {
vv := make(map[string]interface{})
if err := tcodec.Unmarshal(b, &vv); err != nil {
return err
}
*v = vv
return nil
}
func (v Tags) MarshalJSON() ([]byte, error) {
return tcodec.Marshal(v)
}