106 lines
3.1 KiB
Go
106 lines
3.1 KiB
Go
package thumb
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import "github.com/disintegration/imaging"
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var (
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Size = 3840
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Limit = 3840
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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 > Limit {
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return Size
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}
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return Limit
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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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Source string
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Width int
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Height int
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Public bool
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Options []ResampleOption
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}
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var Types = map[string]Type{
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"tile_50": {"tile_500", 50, 50, false, []ResampleOption{ResampleFillCenter, ResampleDefault}},
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"tile_100": {"tile_500", 100, 100, false, []ResampleOption{ResampleFillCenter, ResampleDefault}},
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"tile_224": {"tile_500", 224, 224, false, []ResampleOption{ResampleFillCenter, ResampleDefault}},
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"tile_500": {"", 500, 500, false, []ResampleOption{ResampleFillCenter, ResampleDefault}},
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"colors": {"fit_720", 3, 3, false, []ResampleOption{ResampleResize, ResampleNearestNeighbor, ResamplePng}},
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"left_224": {"fit_720", 224, 224, false, []ResampleOption{ResampleFillTopLeft, ResampleDefault}},
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"right_224": {"fit_720", 224, 224, false, []ResampleOption{ResampleFillBottomRight, ResampleDefault}},
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"fit_720": {"", 720, 720, true, []ResampleOption{ResampleFit, ResampleDefault}},
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"fit_1280": {"fit_2048", 1280, 1024, true, []ResampleOption{ResampleFit, ResampleDefault}},
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"fit_1920": {"fit_2048", 1920, 1200, true, []ResampleOption{ResampleFit, ResampleDefault}},
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"fit_2048": {"", 2048, 2048, true, []ResampleOption{ResampleFit, ResampleDefault}},
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"fit_2560": {"", 2560, 1600, true, []ResampleOption{ResampleFit, ResampleDefault}},
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"fit_3840": {"", 3840, 2400, true, []ResampleOption{ResampleFit, ResampleDefault}},
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}
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var DefaultTypes = []string{
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"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",
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}
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// Returns true if thumbnail is too large and can not be rendered at all.
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func (t Type) ExceedsLimit() 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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