photoprism/internal/thumb/types.go

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package thumb
import "github.com/disintegration/imaging"
var (
Size = 3840
Limit = 3840
Filter = ResampleLanczos
JpegQuality = 95
JpegQualitySmall = 80
)
func MaxSize() int {
if Size > Limit {
return Size
}
return Limit
}
func InvalidSize(size int) bool {
return size < 0 || size > MaxSize()
}
const (
ResampleBlackman ResampleFilter = "blackman"
ResampleLanczos ResampleFilter = "lanczos"
ResampleCubic ResampleFilter = "cubic"
ResampleLinear ResampleFilter = "linear"
)
type ResampleFilter string
func (a ResampleFilter) Imaging() imaging.ResampleFilter {
switch a {
case ResampleBlackman:
return imaging.Blackman
case ResampleLanczos:
return imaging.Lanczos
case ResampleCubic:
return imaging.CatmullRom
case ResampleLinear:
return imaging.Linear
default:
return imaging.Lanczos
}
}
const (
ResampleFillCenter ResampleOption = iota
ResampleFillTopLeft
ResampleFillBottomRight
ResampleFit
ResampleResize
ResampleNearestNeighbor
ResampleDefault
ResamplePng
)
type ResampleOption int
var ResampleMethods = map[ResampleOption]string{
ResampleFillCenter: "center",
ResampleFillTopLeft: "left",
ResampleFillBottomRight: "right",
ResampleFit: "fit",
ResampleResize: "resize",
}
type Type struct {
Source string
Width int
Height int
Public bool
Options []ResampleOption
}
type TypeMap map[string]Type
var Types = TypeMap{
"tile_50": {"tile_500", 50, 50, false, []ResampleOption{ResampleFillCenter, ResampleDefault}},
"tile_100": {"tile_500", 100, 100, false, []ResampleOption{ResampleFillCenter, ResampleDefault}},
"tile_224": {"tile_500", 224, 224, false, []ResampleOption{ResampleFillCenter, ResampleDefault}},
"tile_500": {"", 500, 500, false, []ResampleOption{ResampleFillCenter, ResampleDefault}},
"colors": {"fit_720", 3, 3, false, []ResampleOption{ResampleResize, ResampleNearestNeighbor, ResamplePng}},
"left_224": {"fit_720", 224, 224, false, []ResampleOption{ResampleFillTopLeft, ResampleDefault}},
"right_224": {"fit_720", 224, 224, false, []ResampleOption{ResampleFillBottomRight, ResampleDefault}},
"fit_720": {"", 720, 720, true, []ResampleOption{ResampleFit, ResampleDefault}},
"fit_1280": {"fit_2048", 1280, 1024, true, []ResampleOption{ResampleFit, ResampleDefault}},
"fit_1920": {"fit_2048", 1920, 1200, true, []ResampleOption{ResampleFit, ResampleDefault}},
"fit_2048": {"", 2048, 2048, true, []ResampleOption{ResampleFit, ResampleDefault}},
"fit_2560": {"", 2560, 1600, true, []ResampleOption{ResampleFit, ResampleDefault}},
"fit_3840": {"", 3840, 2400, true, []ResampleOption{ResampleFit, ResampleDefault}},
}
var DefaultTypes = []string{
"fit_3840", "fit_2560", "fit_2048", "fit_1920", "fit_1280", "fit_720", "right_224", "left_224", "colors", "tile_500", "tile_224", "tile_100", "tile_50",
}
// Returns true if thumbnail is too large and can not be rendered at all.
func (t Type) ExceedsLimit() bool {
return t.Width > MaxSize() || t.Height > MaxSize()
}
// Returns true if thumbnail type should not be pre-rendered.
func (t Type) OnDemand() bool {
return t.Width > Size || t.Height > Size
}