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