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exp/draw: remove Border function.

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It was only used by exp/4s, and even if it is general purpose, I think
it belongs in a graphics library atop exp/draw, not in exp/draw itself.

R=rsc
CC=golang-dev
https://golang.org/cl/3705041
This commit is contained in:
Nigel Tao 2010-12-16 15:11:10 +11:00
parent 319ab4782c
commit 0bf2aa1aa7
1 changed files with 0 additions and 23 deletions
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23
src/pkg/exp/draw/draw.go
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@ -361,26 +361,3 @@ func drawRGBA(dst *image.RGBA, r image.Rectangle, src image.Image, sp image.Poin
}
}
}
// Border aligns r.Min in dst with sp in src and then replaces pixels
// in a w-pixel border around r in dst with the result of the Porter-Duff compositing
// operation ``src over dst.'' If w is positive, the border extends w pixels inside r.
// If w is negative, the border extends w pixels outside r.
func Border(dst Image, r image.Rectangle, w int, src image.Image, sp image.Point) {
i := w
if i > 0 {
// inside r
Draw(dst, image.Rect(r.Min.X, r.Min.Y, r.Max.X, r.Min.Y+i), src, sp) // top
Draw(dst, image.Rect(r.Min.X, r.Min.Y+i, r.Min.X+i, r.Max.Y-i), src, sp.Add(image.Pt(0, i))) // left
Draw(dst, image.Rect(r.Max.X-i, r.Min.Y+i, r.Max.X, r.Max.Y-i), src, sp.Add(image.Pt(r.Dx()-i, i))) // right
Draw(dst, image.Rect(r.Min.X, r.Max.Y-i, r.Max.X, r.Max.Y), src, sp.Add(image.Pt(0, r.Dy()-i))) // bottom
return
}
// outside r;
i = -i
Draw(dst, image.Rect(r.Min.X-i, r.Min.Y-i, r.Max.X+i, r.Min.Y), src, sp.Add(image.Pt(-i, -i))) // top
Draw(dst, image.Rect(r.Min.X-i, r.Min.Y, r.Min.X, r.Max.Y), src, sp.Add(image.Pt(-i, 0))) // left
Draw(dst, image.Rect(r.Max.X, r.Min.Y, r.Max.X+i, r.Max.Y), src, sp.Add(image.Pt(r.Dx(), 0))) // right
Draw(dst, image.Rect(r.Min.X-i, r.Max.Y, r.Max.X+i, r.Max.Y+i), src, sp.Add(image.Pt(-i, 0))) // bottom
}