overwrite orientation

vips/header.c

@@ -29,3 +29,7 @@ int get_meta_orientation(VipsImage *in) {
 
     return orientation;
 }
+
+void set_meta_orientation(VipsImage *in, int orientation) {
+	vips_image_set_int(in, VIPS_META_ORIENTATION, orientation);
+}

vips/header.go

@@ -19,3 +19,7 @@ func vipsRemoveMetadata(in *C.VipsImage) {
 func vipsGetMetaOrientation(in *C.VipsImage) int {
 	return int(C.get_meta_orientation(in))
 }
+
+func vipsSetMetaOrientation(in *C.VipsImage, orientation int) {
+	C.set_meta_orientation(in, C.int(orientation))
+}

vips/header.h

@@ -11,3 +11,4 @@ int remove_icc_profile(VipsImage *in);
 void remove_metadata(VipsImage *in);
 
 int get_meta_orientation(VipsImage *in);
+void set_meta_orientation(VipsImage *in, int orientation);

vips/image.go

@@ -163,6 +163,10 @@ func (r *ImageRef) GetOrientation() int {
 	return vipsGetMetaOrientation(r.image)
 }
 
+func (r *ImageRef) SetOrientation(orientation int) {
+	vipsSetMetaOrientation(r.image, orientation)
+}
+
 // ResX returns the X resolution
 func (r *ImageRef) ResX() float64 {
 	return float64(r.image.Xres)

vips/transform.go

@@ -68,6 +68,7 @@ type TransformParams struct {
 	SharpM2                 float64
 	StripProfile            bool
 	StripMetadata           bool
+	OverwriteOrientation    int
 	Interpretation          Interpretation
 	BackgroundColor         *Color
 }
@@ -120,6 +121,11 @@ func (t *Transform) CropOffsetY(y int) *Transform {
 	return t
 }
 
+func (t *Transform) SetOverwriteOrientation(o int) *Transform {
+	t.transformParams.OverwriteOrientation = o
+	return t
+}
+
 // CropRelativeOffsetX sets the target offset from the crop position
 func (t *Transform) CropRelativeOffsetX(x float64) *Transform {
 	t.transformParams.CropOffsetX.SetScale(x)
@@ -693,6 +699,10 @@ func (b *blackboard) postProcess() error {
 		}
 	}
 
+	if b.OverwriteOrientation > 1 {
+		b.image.SetOrientation(b.OverwriteOrientation)
+	}
+
 	return nil
 }