// Changes the size of the canvas using specified filter and blur, returns true on success.
func (self *Canvas) ResizeWithFilter(width uint, height uint, filter uint, blur float32) error {
if width == 0 && height == 0 {
return errors.New("Please specify at least one of dimensions")
}
if width == 0 || height == 0 {
origHeight := uint(C.MagickGetImageHeight(self.wand))
origWidth := uint(C.MagickGetImageWidth(self.wand))
if width == 0 {
ratio := float32(origHeight) / float32(height)
width = uint(float32(origWidth) / ratio)
}
if height == 0 {
ratio := float32(origWidth) / float32(width)
height = uint(float32(origHeight) / ratio)
}
}
success := C.MagickResizeImage(self.wand, C.size_t(width), C.size_t(height), C.FilterTypes(filter), C.double(blur))
if success == C.MagickFalse {
return fmt.Errorf("Could not resize: %s", self.Error())
}
return nil
}
// ResizeBlur returns a new image resized to the given dimensions using the provided
// filter and blur factor (where > 1 is blurry, < 1 is sharp). If width or height is
// < 0, it's calculated proportionally to the other dimension. If both of them are < 0,
// an error is returned.
func (im *Image) ResizeBlur(width, height int, filter Filter, blur float64) (*Image, error) {
var data C.ResizeData
if width < 0 {
if height < 0 {
return nil, fmt.Errorf("invalid resize %dx%d", width, height)
}
h := float64(im.Height())
var ratio float64
if h != 0 {
ratio = float64(im.Width()) / h
}
width = int(float64(height) * ratio)
}
if height < 0 {
if width < 0 {
return nil, fmt.Errorf("invalid resize %dx%d", width, height)
}
var ratio float64
w := float64(im.Width())
if w != 0 {
ratio = float64(im.Height()) / w
}
height = int(float64(width) * ratio)
}
data.columns = C.ulong(width)
data.rows = C.ulong(height)
data.filter = C.FilterTypes(filter)
data.blur = C.double(blur)
return im.applyDataFunc("resizing", C.ImageDataFunc(C.resizeImage), &data)
}
// ResizeBlur returns a new image resized to the given dimensions using the provided
// filter and blur factor (where > 1 is blurry, < 1 is sharp).
func (im *Image) ResizeBlur(width, height int, filter Filter, blur float64) (*Image, error) {
var data C.ResizeData
data.columns = C.ulong(width)
data.rows = C.ulong(height)
data.filter = C.FilterTypes(filter)
data.blur = C.double(blur)
return im.applyDataFunc("resizing", C.ImageDataFunc(C.resizeImage), &data)
}
/* Scales an image to the desired dimensions. */
func (w *MagickWand) ResizeImage(columns, rows uint, filter int, blur float64) error {
if C.MagickResizeImage(w.wand, C.size_t(columns), C.size_t(rows), C.FilterTypes(filter), C.double(blur)) == C.MagickFalse {
eStr, eCode := w.Exception()
return fmt.Errorf("Resize() failed : [%d] %s", eStr, eCode)
}
return nil
}