90 lines
2 KiB
Go
90 lines
2 KiB
Go
package thumb
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import (
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"strconv"
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"strings"
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"github.com/photoprism/photoprism/pkg/txt"
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"github.com/disintegration/imaging"
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)
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// Quality represents a JPEG image quality.
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type Quality int
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// EncodeOption returns the quality as imaging.EncodeOption.
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func (q Quality) EncodeOption() imaging.EncodeOption {
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return imaging.JPEGQuality(int(q))
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}
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// String returns the quality as string.
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func (q Quality) String() string {
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return strconv.Itoa(int(q))
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}
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// Common Quality levels.
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// see https://docs.photoprism.app/user-guide/settings/advanced/#jpeg-quality
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const (
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QualityBest Quality = 95
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QualityHigh Quality = 92
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QualityMedium Quality = 85
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QualityLow Quality = 80
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QualityBad Quality = 75
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QualityWorst Quality = 70
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)
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// QualityLevels maps human-readable settings to a numeric Quality.
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var QualityLevels = map[string]Quality{
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"5": QualityBest,
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"ultra": QualityBest,
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"best": QualityBest,
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"4": QualityHigh,
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"excellent": QualityHigh,
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"good": QualityHigh,
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"high": QualityHigh,
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"3": QualityMedium,
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"": QualityMedium,
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"ok": QualityMedium,
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"default": QualityMedium,
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"standard": QualityMedium,
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"medium": QualityMedium,
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"2": QualityLow,
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"low": QualityLow,
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"small": QualityLow,
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"1": QualityBad,
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"bad": QualityBad,
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"0": QualityWorst,
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"worst": QualityWorst,
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"lowest": QualityWorst,
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}
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// Current Quality settings.
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var (
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JpegQuality = QualityMedium
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JpegQualitySmall = QualityLow
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)
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// ParseQuality returns the matching quality based on a config value string.
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func ParseQuality(s string) Quality {
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// Default to medium if empty.
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if s == "" {
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return QualityMedium
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}
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// Try to parse as positive integer.
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if i := txt.Int(s); i >= 25 && i <= 100 {
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return Quality(i)
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}
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// Normalize value.
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s = strings.ToLower(strings.TrimSpace(s))
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// Human-readable quality levels.
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if l, ok := QualityLevels[s]; ok && l > 0 {
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return l
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}
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// Default to medium.
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return QualityMedium
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}
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