mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-09-20 05:12:18 +02:00
48 lines
1.0 KiB
Go
48 lines
1.0 KiB
Go
/*
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Copyright 2014 Hajime Hoshi
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package internal
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import (
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"image/color"
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"math"
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)
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func NextPowerOf2(x uint64) uint64 {
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x -= 1
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x |= (x >> 1)
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x |= (x >> 2)
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x |= (x >> 4)
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x |= (x >> 8)
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x |= (x >> 16)
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x |= (x >> 32)
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return x + 1
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}
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func NextPowerOf2Int(size int) int {
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return int(NextPowerOf2(uint64(size)))
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}
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func RGBA(clr color.Color) (r, g, b, a float64) {
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cr, cg, cb, ca := clr.RGBA()
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const max = math.MaxUint16
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r = float64(cr) / max
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g = float64(cg) / max
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b = float64(cb) / max
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a = float64(ca) / max
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return
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}
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