forked from wix-playground/govips
/
resample.go
82 lines (63 loc) · 2.19 KB
/
resample.go
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package vips
// #include "resample.h"
import "C"
// Kernel represents VipsKernel type
type Kernel int
// Kernel enum
const (
KernelAuto Kernel = -1
KernelNearest Kernel = C.VIPS_KERNEL_NEAREST
KernelLinear Kernel = C.VIPS_KERNEL_LINEAR
KernelCubic Kernel = C.VIPS_KERNEL_CUBIC
KernelLanczos2 Kernel = C.VIPS_KERNEL_LANCZOS2
KernelLanczos3 Kernel = C.VIPS_KERNEL_LANCZOS3
KernelMitchell Kernel = C.VIPS_KERNEL_MITCHELL
)
// https://libvips.github.io/libvips/API/current/libvips-resample.html#vips-resize
func vipsResize(in *C.VipsImage, scale float64, kernel Kernel) (*C.VipsImage, error) {
incOpCounter("resize")
var out *C.VipsImage
// libvips recommends Lanczos3 as the default kernel
if kernel == KernelAuto {
kernel = KernelLanczos3
}
if err := C.resize_image(in, &out, C.double(scale), C.double(-1), C.int(kernel)); err != 0 {
return nil, handleImageError(out)
}
return out, nil
}
// https://libvips.github.io/libvips/API/current/libvips-resample.html#vips-resize
func vipsResizeWithVScale(in *C.VipsImage, scale, vscale float64, kernel Kernel) (*C.VipsImage, error) {
incOpCounter("resize")
var out *C.VipsImage
if err := C.resize_image(in, &out, C.double(scale), C.gdouble(vscale), C.int(kernel)); err != 0 {
return nil, handleImageError(out)
}
return out, nil
}
func vipsThumbnail(in *C.VipsImage, width, height int, crop Interesting) (*C.VipsImage, error) {
incOpCounter("thumbnail")
var out *C.VipsImage
if err := C.thumbnail_image(in, &out, C.int(width), C.int(height), C.int(crop)); err != 0 {
return nil, handleImageError(out)
}
return out, nil
}
// https://libvips.github.io/libvips/API/current/libvips-resample.html#vips-mapim
func vipsMapim(in *C.VipsImage, index *C.VipsImage) (*C.VipsImage, error) {
incOpCounter("mapim")
var out *C.VipsImage
if err := C.mapim(in, &out, index); err != 0 {
return nil, handleImageError(out)
}
return out, nil
}
// https://libvips.github.io/libvips/API/current/libvips-histogram.html#vips-maplut
func vipsMaplut(in *C.VipsImage, lut *C.VipsImage) (*C.VipsImage, error) {
incOpCounter("maplut")
var out *C.VipsImage
if err := C.maplut(in, &out, lut); err != 0 {
return nil, handleImageError(out)
}
return out, nil
}