go-imgrow/image.go

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2024-02-09 19:12:33 +00:00
package imgrow
import (
"image"
"image/color"
)
// Image returns an image that is 'img' scalad by 'scalar'.
//
// So, for example:
//
// var newImage image.Image = imgrow.Image(2, oldImage)
//
// ... would return a new image that is just like 'oldImage' except that it is 2 times as big.
func Image(scalar int, img image.Image) image.Image {
return internalImage {
img:img,
scalar:scalar,
}
}
var _ image.Image = &internalImage{}
type internalImage struct {
img image.Image
scalar int
}
func (receiver internalImage) At(x, y int) color.Color {
var img image.Image = receiver.img
if nil == img {
return nil
}
var scalar int = receiver.scalar
x2, y2 := inverseScaleXY(scalar, x, y)
return img.At(x2, y2)
}
func (receiver internalImage) Bounds() image.Rectangle {
var img image.Image = receiver.img
if nil == img {
return image.Rectangle{}
}
return scaleRectangle(receiver.scalar, img.Bounds())
}
func (receiver internalImage) ColorModel() color.Model {
var img image.Image = receiver.img
if nil == img {
return nil
}
return img.ColorModel()
}