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palette.go
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palette.go
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package service
// https://groups.google.com/forum/#!topic/iiif-discuss/sPU5BvSWEOo
// http://palette.davidnewbury.com/
import (
"context"
_ "log"
"github.com/aaronland/go-colours"
"github.com/aaronland/go-colours/extruder"
"github.com/aaronland/go-colours/grid"
"github.com/aaronland/go-colours/palette"
iiifconfig "github.com/go-iiif/go-iiif/v5/config"
iiifimage "github.com/go-iiif/go-iiif/v5/image"
)
func init() {
ctx := context.Background()
err := RegisterService(ctx, "palette", initPaletteService)
if err != nil {
panic(err)
}
}
func initPaletteService(ctx context.Context, cfg *iiifconfig.Config, im iiifimage.Image) (Service, error) {
return NewPaletteService(cfg.Palette, im)
}
type PaletteService struct {
Service `json:",omitempty"`
PaletteContext string `json:"@context"`
PaletteProfile string `json:"profile"`
PaletteLabel string `json:"label"`
Palette []colours.Colour `json:"palette,omitempty"`
}
func (s *PaletteService) Context() string {
return s.PaletteContext
}
func (s *PaletteService) Profile() string {
return s.PaletteProfile
}
func (s *PaletteService) Label() string {
return s.PaletteLabel
}
func (s *PaletteService) Value() interface{} {
return s.Palette
}
func NewPaletteService(cfg iiifconfig.PaletteConfig, image iiifimage.Image) (Service, error) {
// b, _ := json.Marshal(cfg)
// log.Println(string(b))
use_extruder := cfg.Extruder.Name
count_colours := cfg.Extruder.Count
use_grid := cfg.Grid.Name
use_palette := make([]string, 0)
for _, p := range cfg.Palettes {
use_palette = append(use_palette, p.Name)
}
im, err := iiifimage.IIIFImageToGolangImage(image)
if err != nil {
return nil, err
}
ex, err := extruder.NewNamedExtruder(use_extruder)
if err != nil {
return nil, err
}
gr, err := grid.NewNamedGrid(use_grid)
if err != nil {
return nil, err
}
plts := make([]colours.Palette, len(use_palette))
for i, p := range use_palette {
pl, err := palette.NewNamedPalette(p)
if err != nil {
return nil, err
}
plts[i] = pl
}
has_colours, err := ex.Colours(im, count_colours)
if err != nil {
return nil, err
}
for _, c := range has_colours {
for _, pl := range plts {
cl, err := gr.Closest(c, pl)
if err != nil {
return nil, err
}
err = c.AppendClosest(cl)
if err != nil {
return nil, err
}
}
}
s := PaletteService{
PaletteContext: "x-urn:service:go-iiif#palette",
PaletteProfile: "x-urn:service:go-iiif#palette",
PaletteLabel: "x-urn:service:go-iiif#palette",
Palette: has_colours,
}
return &s, nil
}