// Copyright (C) 2015 The Android Open Source Project
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package atom

import "android.googlesource.com/platform/tools/gpu/interval"

// RangeList is a list of atom ranges.
type RangeList []Range

// Length returns the number of ranges in the list.
func (l RangeList) Length() int { return len(l) }

// GetSpan returns the atom index span for the range at index in the list.
func (l RangeList) GetSpan(index int) interval.U64Span { return l[index].Span() }

// SetSpan sets the atom index span for the group at index in the list.
func (l RangeList) SetSpan(index int, span interval.U64Span) { l[index].SetSpan(span) }

// Copy copies count ranges within the list.
func (l RangeList) Copy(to, from, count int) { copy(l[to:to+count], l[from:from+count]) }

// Resize adjusts the length of the list.
func (l *RangeList) Resize(length int) {
	if cap(*l) > length {
		*l = (*l)[:length]
	} else {
		old := *l
		capacity := cap(*l) * 2
		if capacity < length {
			capacity = length
		}
		*l = make(RangeList, length, capacity)
		copy(*l, old)
	}
}