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