66 lines
2.1 KiB
Go
66 lines
2.1 KiB
Go
|
package internal
|
||
|
|
|
||
|
|
import (
|
||
|
|
"bytes"
|
||
|
|
"fmt"
|
||
|
|
"image"
|
||
|
|
"image/color"
|
||
|
|
"strconv"
|
||
|
|
"time"
|
||
|
|
|
||
|
|
"git.velvettear.de/velvettear/loggo"
|
||
|
|
"git.velvettear.de/velvettear/slideshow/internal/config"
|
||
|
|
color_thief "github.com/kennykarnama/color-thief"
|
||
|
|
)
|
||
|
|
|
||
|
|
// extract the given amount of dominant colors of raw image bytes
|
||
|
|
func GetColorPalette(data []byte) (string, error) {
|
||
|
|
var palette string
|
||
|
|
timestamp := time.Now().UnixMilli()
|
||
|
|
amount := config.PaletteColors
|
||
|
|
img, _, error := image.Decode(bytes.NewReader(data))
|
||
|
|
if error != nil {
|
||
|
|
loggo.ErrorTimed("encountered an error decoding the provided raw image bytes to an image", timestamp, error.Error())
|
||
|
|
return palette, error
|
||
|
|
}
|
||
|
|
colors, error := color_thief.GetPalette(img, amount, config.PaletteAlgorithm)
|
||
|
|
if error != nil {
|
||
|
|
loggo.ErrorTimed("encountered an error generating the color palette from raw image bytes", timestamp, "colors: "+strconv.Itoa(amount))
|
||
|
|
return palette, error
|
||
|
|
} else {
|
||
|
|
loggo.DebugTimed("generated color palette from raw image bytes", timestamp, "colors: "+strconv.Itoa(amount))
|
||
|
|
}
|
||
|
|
for index, color := range colors {
|
||
|
|
if index > 0 {
|
||
|
|
palette += "\n"
|
||
|
|
}
|
||
|
|
tmp := strconv.Itoa(index)
|
||
|
|
if len(tmp) < 2 {
|
||
|
|
tmp = "0" + tmp
|
||
|
|
}
|
||
|
|
tmp = "SLIDESHOW_COLOR" + tmp
|
||
|
|
palette += tmp + "=\"" + rgbToHex(color) + "\""
|
||
|
|
}
|
||
|
|
return palette, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
// extract the given amount of dominant colors of an image
|
||
|
|
func getColorPalette(image string) ([]color.Color, error) {
|
||
|
|
var colors []color.Color
|
||
|
|
timestamp := time.Now().UnixMilli()
|
||
|
|
amount := config.PaletteColors
|
||
|
|
colors, error := color_thief.GetPaletteFromFile(image, amount, config.PaletteAlgorithm)
|
||
|
|
if error != nil {
|
||
|
|
loggo.ErrorTimed("encountered an error generating the color palette from image", timestamp, "image: "+image, "colors: "+strconv.Itoa(amount))
|
||
|
|
} else {
|
||
|
|
loggo.DebugTimed("generated color palette from image", timestamp, "image: "+image, "colors: "+strconv.Itoa(amount))
|
||
|
|
}
|
||
|
|
return colors, error
|
||
|
|
}
|
||
|
|
|
||
|
|
// parse rgb color values to hex
|
||
|
|
func rgbToHex(color color.Color) string {
|
||
|
|
r, g, b, _ := color.RGBA()
|
||
|
|
return fmt.Sprintf("#%02x%02x%02x", uint8(r>>8), uint8(g>>8), uint8(b>>8))
|
||
|
|
}
|