142 lines
4.2 KiB
Go
142 lines
4.2 KiB
Go
package thumb
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import "github.com/disintegration/imaging"
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var (
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Size = 2048
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SizeUncached = 7680
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Filter = ResampleLanczos
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JpegQuality = 95
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JpegQualitySmall = 80
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)
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func MaxSize() int {
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if Size > SizeUncached {
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return Size
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}
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return SizeUncached
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}
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func InvalidSize(size int) bool {
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return size < 0 || size > MaxSize()
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}
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const (
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ResampleBlackman ResampleFilter = "blackman"
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ResampleLanczos ResampleFilter = "lanczos"
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ResampleCubic ResampleFilter = "cubic"
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ResampleLinear ResampleFilter = "linear"
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)
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type ResampleFilter string
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func (a ResampleFilter) Imaging() imaging.ResampleFilter {
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switch a {
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case ResampleBlackman:
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return imaging.Blackman
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case ResampleLanczos:
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return imaging.Lanczos
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case ResampleCubic:
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return imaging.CatmullRom
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case ResampleLinear:
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return imaging.Linear
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default:
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return imaging.Lanczos
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}
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}
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const (
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ResampleFillCenter ResampleOption = iota
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ResampleFillTopLeft
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ResampleFillBottomRight
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ResampleFit
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ResampleResize
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ResampleNearestNeighbor
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ResampleDefault
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ResamplePng
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)
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type ResampleOption int
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var ResampleMethods = map[ResampleOption]string{
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ResampleFillCenter: "center",
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ResampleFillTopLeft: "left",
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ResampleFillBottomRight: "right",
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ResampleFit: "fit",
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ResampleResize: "resize",
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}
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type Type struct {
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Use string `json:"use"`
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Source string `json:"-"`
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Width int `json:"w"`
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Height int `json:"h"`
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Public bool `json:"-"`
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Options []ResampleOption `json:"-"`
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}
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type TypeMap map[string]Type
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var Types = TypeMap{
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"tile_50": {"Lists", "tile_500", 50, 50, false, []ResampleOption{ResampleFillCenter, ResampleDefault}},
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"tile_100": {"Maps", "tile_500", 100, 100, false, []ResampleOption{ResampleFillCenter, ResampleDefault}},
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"tile_224": {"TensorFlow, Mosaic", "tile_500", 224, 224, false, []ResampleOption{ResampleFillCenter, ResampleDefault}},
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"tile_500": {"Tiles", "", 500, 500, false, []ResampleOption{ResampleFillCenter, ResampleDefault}},
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"colors": {"Color Detection", "fit_720", 3, 3, false, []ResampleOption{ResampleResize, ResampleNearestNeighbor, ResamplePng}},
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"left_224": {"TensorFlow", "fit_720", 224, 224, false, []ResampleOption{ResampleFillTopLeft, ResampleDefault}},
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"right_224": {"TensorFlow", "fit_720", 224, 224, false, []ResampleOption{ResampleFillBottomRight, ResampleDefault}},
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"fit_720": {"Mobile, TV", "", 720, 720, true, []ResampleOption{ResampleFit, ResampleDefault}},
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"fit_1280": {"Mobile, HD Ready TV", "fit_2048", 1280, 1024, true, []ResampleOption{ResampleFit, ResampleDefault}},
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"fit_1920": {"Mobile, Full HD TV", "fit_2048", 1920, 1200, true, []ResampleOption{ResampleFit, ResampleDefault}},
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"fit_2048": {"Tablets, Cinema 2K", "", 2048, 2048, true, []ResampleOption{ResampleFit, ResampleDefault}},
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"fit_2560": {"Quad HD, Retina Display", "", 2560, 1600, true, []ResampleOption{ResampleFit, ResampleDefault}},
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"fit_3840": {"Ultra HD", "", 3840, 2400, false, []ResampleOption{ResampleFit, ResampleDefault}}, // Deprecated in favor of fit_4096
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"fit_4096": {"Ultra HD, Retina 4K", "", 4096, 4096, true, []ResampleOption{ResampleFit, ResampleDefault}},
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"fit_7680": {"8K Ultra HD 2, Retina 6K", "", 7680, 4320, true, []ResampleOption{ResampleFit, ResampleDefault}},
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}
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var DefaultTypes = []string{
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"fit_7680",
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"fit_4096",
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"fit_2560",
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"fit_2048",
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"fit_1920",
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"fit_1280",
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"fit_720",
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"right_224",
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"left_224",
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"colors",
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"tile_500",
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"tile_224",
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"tile_100",
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"tile_50",
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}
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// Find returns the largest default thumbnail type for the given size limit.
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func Find(limit int) (name string, result Type) {
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for _, name = range DefaultTypes {
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t := Types[name]
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if t.Width <= limit && t.Height <= limit {
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return name, t
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}
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}
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return "", Type{}
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}
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// Returns true if thumbnail type exceeds the cached thumbnails size.
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func (t Type) ExceedsSize() bool {
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return t.Width > Size || t.Height > Size
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}
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// Returns true if thumbnail type is too large and can not be rendered at all.
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func (t Type) ExceedsSizeUncached() bool {
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return t.Width > MaxSize() || t.Height > MaxSize()
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}
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// Returns true if thumbnail type should not be pre-rendered.
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func (t Type) OnDemand() bool {
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return t.Width > Size || t.Height > Size
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}
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