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graphics: Use shift instead of div

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This commit is contained in:
Hajime Hoshi 2016-10-27 02:47:10 +09:00
parent bf76e94ad2
commit b77a28b208
2 changed files with 24 additions and 9 deletions
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15
vertices.go
View File

@ -52,8 +52,14 @@ func vertices(parts ImageParts, width, height int, geo *GeoM) []int16 {
oneSize := totalSize / 4
l := parts.Len()
vs := make([]int16, l*totalSize)
width2p := graphics.NextPowerOf2Int(width)
height2p := graphics.NextPowerOf2Int(height)
w := uint(0)
h := uint(0)
for (1 << w) < width {
w++
}
for (1 << h) < height {
h++
}
geo16 := floatsToInt16s(geo.Element(0, 0),
geo.Element(0, 1),
geo.Element(1, 0),
@ -71,7 +77,10 @@ func vertices(parts ImageParts, width, height int, geo *GeoM) []int16 {
if sx0 == sx1 || sy0 == sy1 {
continue
}
u0, v0, u1, v1 := u(sx0, width2p), v(sy0, height2p), u(sx1, width2p), v(sy1, height2p)
u0 := int16((math.MaxInt16 * sx0) >> w)
v0 := int16((math.MaxInt16 * sy0) >> h)
u1 := int16((math.MaxInt16 * sx1) >> w)
v1 := int16((math.MaxInt16 * sy1) >> h)
offset := n * totalSize
vs[offset] = x0
vs[offset+1] = y0

18
vertices_js.go
View File

@ -31,8 +31,14 @@ func vertices(parts ImageParts, width, height int, geo *GeoM) []int16 {
a := js.Global.Get("ArrayBuffer").New(l * totalSize * 2)
af32 := js.Global.Get("Float32Array").New(a)
a16 := js.Global.Get("Int16Array").New(a)
w2p := graphics.NextPowerOf2Int(width)
h2p := graphics.NextPowerOf2Int(height)
w := uint(0)
h := uint(0)
for (1 << w) < width {
w++
}
for (1 << h) < height {
h++
}
gs := []float64{geo.Element(0, 0),
geo.Element(0, 1),
geo.Element(1, 0),
@ -49,10 +55,10 @@ func vertices(parts ImageParts, width, height int, geo *GeoM) []int16 {
if sx0 == sx1 || sy0 == sy1 {
continue
}
u0 := math.MaxInt16 * sx0 / w2p
v0 := math.MaxInt16 * sy0 / h2p
u1 := math.MaxInt16 * sx1 / w2p
v1 := math.MaxInt16 * sy1 / h2p
u0 := (math.MaxInt16 * sx0) >> w
v0 := (math.MaxInt16 * sy0) >> h
u1 := (math.MaxInt16 * sx1) >> w
v1 := (math.MaxInt16 * sy1) >> h
offset := n * totalSize
a16.SetIndex(offset, dx0)
a16.SetIndex(offset+1, dy0)