package image
func (p *NRGBA) Opaque() bool
Opaque scans the entire image and reports whether it is fully opaque.
Golang image.NRGBA.Opaque function usage example
package main
import (
"fmt"
"image"
)
func main() {
canvas := image.NewNRGBA(image.Rect(0, 0, 100, 100)) // or NewNRGBA64
// is this canvas(image) opaque
op := canvas.Opaque()
fmt.Println("canvas is opaque ? ", op)
}
References :
http://golang.org/pkg/image/#NRGBA.Opaque
