// GetPixelRegion retrieves the rectangle of pixels defined by an ROI,
// at the current subimage and MIP-map level, storing the pixel values in
// a slice that has been casted to an interface, and in the pixel format type
// described by 'format'.
//
// The underlying type of data is determined by the given TypeDesc.
// Returned interface{} will be:
// TypeUint8 => []uint8
// TypeInt8 => []int8
// TypeUint16 => []uint16
// TypeInt16 => []int16
// TypeUint => []uint
// TypeInt => []int
// TypeUint64 => []uint64
// TypeInt64 => []int64
// TypeHalf => []float32
// TypeFloat => []float32
// TypeDouble => []float64
//
// Example:
//
// val, err := buf.GetPixelRegion(roi, TypeFloat)
// if err != nil {
// panic(err.Error())
// }
// floatPixels := val.([]float32)
//
func (i *ImageBuf) GetPixelRegion(roi *ROI, format TypeDesc) (interface{}, error) {
pixel_iface, ptr, err := allocatePixelBufferSize(roi.NumPixels()*roi.NumChannels(), format)
if err != nil {
return nil, err
}
ok := bool(C.ImageBuf_get_pixel_channels(
i.ptr,
C.int(roi.XBegin()), C.int(roi.XEnd()),
C.int(roi.YBegin()), C.int(roi.YEnd()),
C.int(roi.ZBegin()), C.int(roi.ZEnd()),
C.int(roi.ChannelsBegin()), C.int(roi.ChannelsEnd()),
(C.TypeDesc)(format), ptr),
)
if !ok {
return nil, i.LastError()
}
return pixel_iface, nil
}
// GetFloatPixels retrieves the rectangle of pixels spanning the entire image,
// at the current subimage and MIP-map level, storing the float pixel values in
// a []float32
func (i *ImageBuf) GetFloatPixels() ([]float32, error) {
spec := i.Spec()
size := spec.Width() * spec.Height() * spec.Depth() * spec.NumChannels()
pixels := make([]float32, size)
ptr := unsafe.Pointer(&pixels[0])
roi := i.ROI()
ok := bool(C.ImageBuf_get_pixel_channels(
i.ptr,
C.int(roi.XBegin()), C.int(roi.XEnd()),
C.int(roi.YBegin()), C.int(roi.YEnd()),
C.int(roi.ZBegin()), C.int(roi.ZEnd()),
C.int(roi.ChannelsBegin()), C.int(roi.ChannelsEnd()),
(C.TypeDesc)(TypeFloat), ptr),
)
if !ok {
return nil, i.LastError()
}
return pixels, nil
}