/
colors.go
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/
colors.go
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//
// Copyright 2021 Bryan T. Meyers <root@datadrake.com>
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
package encoding
import (
"encoding/json"
"image/color"
)
type colorsJSON []colorJSON
func (cj colorsJSON) Palette() Colors {
var cs Colors
for _, c := range cj {
cs = append(cs, c.Color())
}
return cs
}
// Colors are a palette of Colors
type Colors color.Palette
// MarshalJSON is a custom marshaler for the Colors type
//
// Each color is stored as a string, consisting of 4 dexadecimal values (RGBA)
func (cs Colors) MarshalJSON() ([]byte, error) {
var j colorsJSON
for _, c := range cs {
j = append(j, newColor(c))
}
return json.Marshal(j)
}
// UnmarshalJSON is a custom unmarshaler for the Colors type
func (cs *Colors) UnmarshalJSON(bs []byte) error {
var j colorsJSON
if err := json.Unmarshal(bs, &j); err != nil {
return err
}
*cs = j.Palette()
return nil
}