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31 lines
780 B
31 lines
780 B
// Copyright 2011 The Graphics-Go Authors. All rights reserved. |
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// Use of this source code is governed by a BSD-style |
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// license that can be found in the LICENSE file. |
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package graphics |
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import ( |
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"code.google.com/p/graphics-go/graphics/interp" |
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"errors" |
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"image" |
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"image/draw" |
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) |
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// Scale produces a scaled version of the image using bilinear interpolation. |
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func Scale(dst draw.Image, src image.Image) error { |
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if dst == nil { |
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return errors.New("graphics: dst is nil") |
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} |
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if src == nil { |
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return errors.New("graphics: src is nil") |
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} |
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b := dst.Bounds() |
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srcb := src.Bounds() |
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if b.Empty() || srcb.Empty() { |
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return nil |
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} |
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sx := float64(b.Dx()) / float64(srcb.Dx()) |
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sy := float64(b.Dy()) / float64(srcb.Dy()) |
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return I.Scale(sx, sy).Transform(dst, src, interp.Bilinear) |
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}
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