trace.go

package core

// VTrace determines the type of visual tracing
type VTrace int

const (
	// VTraceGrid shows the page grid
	VTraceGrid VTrace = iota
	// VTraceAllocation shows allocated cells
	VTraceAllocation
	// VTraceHyphenation shows hyphenation points
	VTraceHyphenation
	// VTraceObjects shows objects
	VTraceObjects
)

// SetVTrace sets the visual tracing.
func (xd *xtsDocument) SetVTrace(t VTrace) {
	xd.tracing |= (1 << t)
}

// ClearVTrace removes the visual tracing.
func (xd *xtsDocument) ClearVTrace(t VTrace) {
	xd.tracing &^= (1 << t)
}

// IsTrace returns true if tracing t is set.
func (xd *xtsDocument) IsTrace(t VTrace) bool {
	return (xd.tracing>>t)&1 == 1
}