magick.go

package magick

// #include <magick/api.h>
// extern void magick_init();
import "C"

// Backend returns the name of the library backend
// which was selected at build time. It must be
// either "ImageMagick" or "GraphicsMagick".
func Backend() string {
	return backend
}

// Supported formats returns a list with the names
// of all supported image formats. This varies depending
// on the backend and the compile options that have been
// used while building IM or GM.
func SupportedFormats() ([]string, error) {
	var ex C.ExceptionInfo
	C.GetExceptionInfo(&ex)
	defer C.DestroyExceptionInfo(&ex)
	infos, p := supportedFormats(&ex)
	if infos == nil {
		return nil, exError(&ex, "getting supported formats")
	}
	var formats []string
	for _, v := range infos {
		if v == nil {
			break
		}
		formats = append(formats, C.GoString(v.name))
	}
	freeMagickMemory(p)
	return formats, nil
}

// QuantumRange returns the maximum value representable by the
// current QuantumDepth (= pow(2, QuantumDepth) - 1).
func QuantumRange() uint64 {
	return 2*(1<<(uint64(C.QuantumDepth)-1)) - 1
}

// QuantumDepth returns the color depth used in magick. This value
// is selected when compiling ImageMagick or GraphicsMagick and
// it's usually 8.
func QuantumDepth() uint {
	return C.QuantumDepth
}

func init() {
	C.magick_init()
}