icns

commit 9f8964affe255c8b6f0ae65e3c1cf9e496dac34a
parent 74033e320b1ed16f581302a33809e044e1228c3b
Author: Jack Mordaunt <jackmordaunt@gmail.com>
Date:   Mon, 29 Jan 2018 19:28:30 +0100

[+] Can now configure interpolation function.

Diffstat:
A
interp.go
 | 
44
++++++++++++++++++++++++++++++++++++++++++++

1 file changed, 44 insertions(+), 0 deletions(-)
diff --git a/interp.go b/interp.go
@@ -0,0 +1,44 @@
+package icns
+
+import (
+	"image"
+	"io"
+
+	"github.com/nfnt/resize"
+)
+
+// InterpolationFunction is the algorithm used to resize the image.
+type InterpolationFunction = resize.InterpolationFunction
+
+// InterpolationFunction constants.
+const (
+	// Nearest-neighbor interpolation
+	NearestNeighbor InterpolationFunction = iota
+	// Bilinear interpolation
+	Bilinear
+	// Bicubic interpolation (with cubic hermite spline)
+	Bicubic
+	// Mitchell-Netravali interpolation
+	MitchellNetravali
+	// Lanczos interpolation (a=2)
+	Lanczos2
+	// Lanczos interpolation (a=3)
+	Lanczos3
+)
+
+// EncodeWithInterpolationFunction uses the given interpolation function resize
+// the image before writing out to wr.
+func EncodeWithInterpolationFunction(
+	wr io.Writer,
+	img image.Image,
+	interp InterpolationFunction,
+) error {
+	iconset, err := NewIconSet(img, interp)
+	if err != nil {
+		return err
+	}
+	if _, err := iconset.WriteTo(wr); err != nil {
+		return err
+	}
+	return nil
+}