func Resize(fpath, tpath string, typ, cols, rows int) error {
var mw *C.MagickWand = C.NewMagickWand()
var cfpath = C.CString(fpath)
var ctpath = C.CString(tpath)
var etype C.ExceptionType
defer func() {
C.free(unsafe.Pointer(cfpath))
C.free(unsafe.Pointer(ctpath))
}()
defer func() {
C.ClearMagickWand(mw)
C.DestroyMagickWand(mw)
}()
if C.MagickReadImage(mw, cfpath) == C.MagickFalse {
goto ERR
}
if C.scale(mw, C.int(typ), C.int(cols), C.int(rows)) == C.MagickFalse {
goto ERR
}
if C.MagickWriteImages(mw, ctpath, C.MagickTrue) == C.MagickFalse {
goto ERR
}
return nil
ERR:
etype = C.MagickGetExceptionType(mw)
return errors.New(C.GoString(C.MagickGetException(mw, &etype)))
}
// Opens an image file, returns true on success.
func (cv Canvas) Open(filename string) bool {
status := C.MagickReadImage(cv.wand, C.CString(filename))
if status == C.MagickFalse {
return false
}
return true
}
/* Reads an image or image sequence. */
func (w *MagickWand) ReadImage(fileName string) error {
if C.MagickReadImage(w.wand, C.CString(fileName)) == C.MagickFalse {
eStr, eCode := w.Exception()
return fmt.Errorf("ReadImage() failed : [%d] %s", eStr, eCode)
}
return nil
}
func (self *Canvas) SetCaption(content string) error {
ccontent := C.CString("caption:" + content)
defer C.free(unsafe.Pointer(ccontent))
if C.MagickReadImage(self.wand, ccontent) == C.MagickFalse {
return fmt.Errorf(`Could not open image "%s": %s`, content, self.Error())
}
return nil
}
// Opens an image file, returns nil on success, error otherwise.
func (self Canvas) Open(filename string) error {
stat, err := os.Stat(filename)
if err != nil {
return err
}
if stat.IsDir() == true {
return fmt.Errorf(`Could not open file "%s": it's a directory!`, filename)
}
status := C.MagickReadImage(self.wand, C.CString(filename))
if status == C.MagickFalse {
return fmt.Errorf(`Could not open image "%s": %s`, filename, self.Error())
}
self.filename = filename
return nil
}