58 lines
1.2 KiB
Go
58 lines
1.2 KiB
Go
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package imgutil
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import (
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"image"
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"image/color"
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)
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// Scale is a scaling image.Image wrapper.
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type Scale struct {
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Image image.Image
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Scale int
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}
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// ColorModel implements image.Image.
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func (s *Scale) ColorModel() color.Model {
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return s.Image.ColorModel()
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}
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// Bounds implements image.Image.
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func (s *Scale) Bounds() image.Rectangle {
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r := s.Image.Bounds()
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return image.Rect(r.Min.X*s.Scale, r.Min.Y*s.Scale,
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r.Max.X*s.Scale, r.Max.Y*s.Scale)
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}
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// At implements image.Image.
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func (s *Scale) At(x, y int) color.Color {
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if x < 0 {
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x = x - s.Scale + 1
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}
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if y < 0 {
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y = y - s.Scale + 1
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}
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return s.Image.At(x/s.Scale, y/s.Scale)
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}
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// LeftRotate is a 90 degree rotating image.Image wrapper.
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type LeftRotate struct {
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Image image.Image
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}
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// ColorModel implements image.Image.
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func (lr *LeftRotate) ColorModel() color.Model {
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return lr.Image.ColorModel()
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}
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// Bounds implements image.Image.
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func (lr *LeftRotate) Bounds() image.Rectangle {
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r := lr.Image.Bounds()
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// Min is inclusive, Max is exclusive.
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return image.Rect(r.Min.Y, -(r.Max.X - 1), r.Max.Y, -(r.Min.X - 1))
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}
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// At implements image.Image.
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func (lr *LeftRotate) At(x, y int) color.Color {
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return lr.Image.At(-y, x)
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}
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