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image/draw: add RGBA64Image fast path
name old time/op new time/op delta GenericOver-4 15.0ms ± 1% 2.9ms ± 1% -80.56% (p=0.008 n=5+5) GenericMaskOver-4 7.82ms ± 4% 1.69ms ± 2% -78.38% (p=0.008 n=5+5) GenericSrc-4 6.13ms ± 3% 1.66ms ± 1% -72.90% (p=0.008 n=5+5) GenericMaskSrc-4 11.5ms ± 1% 2.0ms ± 0% -82.77% (p=0.008 n=5+5) Updates #44808. Change-Id: I131cf6fad01708540390a8012d8f2a21e849fe9d Reviewed-on: https://go-review.googlesource.com/c/go/+/340049 Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org> Trust: Nigel Tao <nigeltao@golang.org>
This commit is contained in:
Nigel Tao
parent
065f380815
commit
9f69a44308
@ -83,6 +83,19 @@ Do not send CLs removing the interior tags from such phrases.
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TODO: complete this section
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</p>
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<dl id="image/draw"><dt><a href="/pkg/image/draw/">image/draw</a></dt>
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<dd>
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<p><!-- CL 340049 -->
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The <code>Draw</code> and <code>DrawMask</code> fallback implementations
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(used when the arguments are not the most common image types) are now
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faster when those arguments implement the optional
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<a href="/pkg/image/draw/#RGBA64Image"><code>draw.RGBA64Image</code></a>
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and <a href="/pkg/image/#RGBA64Image"><code>image.RGBA64Image</code></a>
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interfaces that were added in Go 1.17.
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</p>
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</dd>
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</dl><!-- image/draw -->
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<dl id="syscall"><dt><a href="/pkg/syscall/">syscall</a></dt>
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<dd>
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<p><!-- CL 336550 -->
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@ -119,7 +119,8 @@ func DrawMask(dst Image, r image.Rectangle, src image.Image, sp image.Point, mas
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return
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}
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// Fast paths for special cases. If none of them apply, then we fall back to a general but slow implementation.
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// Fast paths for special cases. If none of them apply, then we fall back
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// to general but slower implementations.
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switch dst0 := dst.(type) {
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case *image.RGBA:
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if op == Over {
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@ -219,6 +220,84 @@ func DrawMask(dst Image, r image.Rectangle, src image.Image, sp image.Point, mas
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y0, y1, dy = y1-1, y0-1, -1
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}
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// Try the draw.RGBA64Image and image.RGBA64Image interfaces, part of the
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// standard library since Go 1.17. These are like the draw.Image and
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// image.Image interfaces but they can avoid allocations from converting
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// concrete color types to the color.Color interface type.
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if dst0, _ := dst.(RGBA64Image); dst0 != nil {
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if src0, _ := src.(image.RGBA64Image); src0 != nil {
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if mask == nil {
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sy := sp.Y + y0 - r.Min.Y
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my := mp.Y + y0 - r.Min.Y
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for y := y0; y != y1; y, sy, my = y+dy, sy+dy, my+dy {
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sx := sp.X + x0 - r.Min.X
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mx := mp.X + x0 - r.Min.X
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for x := x0; x != x1; x, sx, mx = x+dx, sx+dx, mx+dx {
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if op == Src {
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dst0.SetRGBA64(x, y, src0.RGBA64At(sx, sy))
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} else {
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srgba := src0.RGBA64At(sx, sy)
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a := m - uint32(srgba.A)
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drgba := dst0.RGBA64At(x, y)
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dst0.SetRGBA64(x, y, color.RGBA64{
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R: uint16((uint32(drgba.R)*a)/m) + srgba.R,
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G: uint16((uint32(drgba.G)*a)/m) + srgba.G,
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B: uint16((uint32(drgba.B)*a)/m) + srgba.B,
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A: uint16((uint32(drgba.A)*a)/m) + srgba.A,
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})
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}
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}
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}
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return
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} else if mask0, _ := mask.(image.RGBA64Image); mask0 != nil {
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sy := sp.Y + y0 - r.Min.Y
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my := mp.Y + y0 - r.Min.Y
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for y := y0; y != y1; y, sy, my = y+dy, sy+dy, my+dy {
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sx := sp.X + x0 - r.Min.X
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mx := mp.X + x0 - r.Min.X
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for x := x0; x != x1; x, sx, mx = x+dx, sx+dx, mx+dx {
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ma := uint32(mask0.RGBA64At(mx, my).A)
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switch {
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case ma == 0:
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if op == Over {
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// No-op.
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} else {
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dst0.SetRGBA64(x, y, color.RGBA64{})
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}
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case ma == m && op == Src:
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dst0.SetRGBA64(x, y, src0.RGBA64At(sx, sy))
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default:
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srgba := src0.RGBA64At(sx, sy)
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if op == Over {
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drgba := dst0.RGBA64At(x, y)
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a := m - (uint32(srgba.A) * ma / m)
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dst0.SetRGBA64(x, y, color.RGBA64{
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R: uint16((uint32(drgba.R)*a + uint32(srgba.R)*ma) / m),
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G: uint16((uint32(drgba.G)*a + uint32(srgba.G)*ma) / m),
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B: uint16((uint32(drgba.B)*a + uint32(srgba.B)*ma) / m),
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A: uint16((uint32(drgba.A)*a + uint32(srgba.A)*ma) / m),
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})
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} else {
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dst0.SetRGBA64(x, y, color.RGBA64{
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R: uint16(uint32(srgba.R) * ma / m),
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G: uint16(uint32(srgba.G) * ma / m),
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B: uint16(uint32(srgba.B) * ma / m),
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A: uint16(uint32(srgba.A) * ma / m),
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})
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}
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}
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}
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}
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return
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}
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}
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}
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// If none of the faster code paths above apply, use the draw.Image and
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// image.Image interfaces, part of the standard library since Go 1.0.
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var out color.RGBA64
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sy := sp.Y + y0 - r.Min.Y
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my := mp.Y + y0 - r.Min.Y
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@ -13,6 +13,138 @@ import (
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"testing/quick"
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)
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// slowestRGBA is a draw.Image like image.RGBA but it is a different type and
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// therefore does not trigger the draw.go fastest code paths.
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//
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// Unlike slowerRGBA, it does not implement the draw.RGBA64Image interface.
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type slowestRGBA struct {
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Pix []uint8
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Stride int
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Rect image.Rectangle
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}
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func (p *slowestRGBA) ColorModel() color.Model { return color.RGBAModel }
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func (p *slowestRGBA) Bounds() image.Rectangle { return p.Rect }
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func (p *slowestRGBA) At(x, y int) color.Color {
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return p.RGBA64At(x, y)
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}
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func (p *slowestRGBA) RGBA64At(x, y int) color.RGBA64 {
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if !(image.Point{x, y}.In(p.Rect)) {
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return color.RGBA64{}
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}
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i := p.PixOffset(x, y)
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s := p.Pix[i : i+4 : i+4] // Small cap improves performance, see https://golang.org/issue/27857
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r := uint16(s[0])
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g := uint16(s[1])
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b := uint16(s[2])
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a := uint16(s[3])
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return color.RGBA64{
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(r << 8) | r,
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(g << 8) | g,
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(b << 8) | b,
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(a << 8) | a,
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}
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}
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func (p *slowestRGBA) Set(x, y int, c color.Color) {
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if !(image.Point{x, y}.In(p.Rect)) {
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return
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}
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i := p.PixOffset(x, y)
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c1 := color.RGBAModel.Convert(c).(color.RGBA)
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s := p.Pix[i : i+4 : i+4] // Small cap improves performance, see https://golang.org/issue/27857
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s[0] = c1.R
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s[1] = c1.G
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s[2] = c1.B
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s[3] = c1.A
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}
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func (p *slowestRGBA) PixOffset(x, y int) int {
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return (y-p.Rect.Min.Y)*p.Stride + (x-p.Rect.Min.X)*4
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}
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func init() {
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var p interface{} = (*slowestRGBA)(nil)
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if _, ok := p.(RGBA64Image); ok {
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panic("slowestRGBA should not be an RGBA64Image")
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}
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}
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// slowerRGBA is a draw.Image like image.RGBA but it is a different type and
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// therefore does not trigger the draw.go fastest code paths.
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//
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// Unlike slowestRGBA, it still implements the draw.RGBA64Image interface.
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type slowerRGBA struct {
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Pix []uint8
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Stride int
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Rect image.Rectangle
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}
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func (p *slowerRGBA) ColorModel() color.Model { return color.RGBAModel }
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func (p *slowerRGBA) Bounds() image.Rectangle { return p.Rect }
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func (p *slowerRGBA) At(x, y int) color.Color {
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return p.RGBA64At(x, y)
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}
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func (p *slowerRGBA) RGBA64At(x, y int) color.RGBA64 {
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if !(image.Point{x, y}.In(p.Rect)) {
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return color.RGBA64{}
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}
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i := p.PixOffset(x, y)
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s := p.Pix[i : i+4 : i+4] // Small cap improves performance, see https://golang.org/issue/27857
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r := uint16(s[0])
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g := uint16(s[1])
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b := uint16(s[2])
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a := uint16(s[3])
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return color.RGBA64{
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(r << 8) | r,
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(g << 8) | g,
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(b << 8) | b,
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(a << 8) | a,
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}
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}
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func (p *slowerRGBA) Set(x, y int, c color.Color) {
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if !(image.Point{x, y}.In(p.Rect)) {
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return
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}
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i := p.PixOffset(x, y)
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c1 := color.RGBAModel.Convert(c).(color.RGBA)
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s := p.Pix[i : i+4 : i+4] // Small cap improves performance, see https://golang.org/issue/27857
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s[0] = c1.R
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s[1] = c1.G
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s[2] = c1.B
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s[3] = c1.A
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}
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func (p *slowerRGBA) SetRGBA64(x, y int, c color.RGBA64) {
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if !(image.Point{x, y}.In(p.Rect)) {
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return
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}
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i := p.PixOffset(x, y)
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s := p.Pix[i : i+4 : i+4] // Small cap improves performance, see https://golang.org/issue/27857
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s[0] = uint8(c.R >> 8)
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s[1] = uint8(c.G >> 8)
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s[2] = uint8(c.B >> 8)
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s[3] = uint8(c.A >> 8)
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}
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func (p *slowerRGBA) PixOffset(x, y int) int {
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return (y-p.Rect.Min.Y)*p.Stride + (x-p.Rect.Min.X)*4
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}
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func init() {
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var p interface{} = (*slowerRGBA)(nil)
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if _, ok := p.(RGBA64Image); !ok {
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panic("slowerRGBA should be an RGBA64Image")
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}
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}
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func eq(c0, c1 color.Color) bool {
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r0, g0, b0, a0 := c0.RGBA()
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r1, g1, b1, a1 := c1.RGBA()
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@ -260,30 +392,55 @@ func TestDraw(t *testing.T) {
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for _, r := range rr {
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loop:
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for _, test := range drawTests {
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dst := hgradRed(255).(*image.RGBA).SubImage(r).(Image)
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// Draw the (src, mask, op) onto a copy of dst using a slow but obviously correct implementation.
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golden := makeGolden(dst, image.Rect(0, 0, 16, 16), test.src, image.ZP, test.mask, image.ZP, test.op)
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b := dst.Bounds()
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if !b.Eq(golden.Bounds()) {
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t.Errorf("draw %v %s: bounds %v versus %v", r, test.desc, dst.Bounds(), golden.Bounds())
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continue
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}
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// Draw the same combination onto the actual dst using the optimized DrawMask implementation.
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DrawMask(dst, image.Rect(0, 0, 16, 16), test.src, image.ZP, test.mask, image.ZP, test.op)
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if image.Pt(8, 8).In(r) {
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// Check that the resultant pixel at (8, 8) matches what we expect
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// (the expected value can be verified by hand).
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if !eq(dst.At(8, 8), test.expected) {
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t.Errorf("draw %v %s: at (8, 8) %v versus %v", r, test.desc, dst.At(8, 8), test.expected)
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for i := 0; i < 3; i++ {
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dst := hgradRed(255).(*image.RGBA).SubImage(r).(Image)
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// For i != 0, substitute a different-typed dst that will take
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// us off the fastest code paths. We should still get the same
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// result, in terms of final pixel RGBA values.
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switch i {
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case 1:
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d := dst.(*image.RGBA)
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dst = &slowerRGBA{
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Pix: d.Pix,
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Stride: d.Stride,
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Rect: d.Rect,
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}
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case 2:
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d := dst.(*image.RGBA)
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dst = &slowestRGBA{
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Pix: d.Pix,
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Stride: d.Stride,
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Rect: d.Rect,
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}
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}
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// Draw the (src, mask, op) onto a copy of dst using a slow but obviously correct implementation.
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golden := makeGolden(dst, image.Rect(0, 0, 16, 16), test.src, image.ZP, test.mask, image.ZP, test.op)
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b := dst.Bounds()
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if !b.Eq(golden.Bounds()) {
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t.Errorf("draw %v %s on %T: bounds %v versus %v",
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r, test.desc, dst, dst.Bounds(), golden.Bounds())
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continue
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}
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}
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// Check that the resultant dst image matches the golden output.
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for y := b.Min.Y; y < b.Max.Y; y++ {
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for x := b.Min.X; x < b.Max.X; x++ {
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if !eq(dst.At(x, y), golden.At(x, y)) {
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t.Errorf("draw %v %s: at (%d, %d), %v versus golden %v", r, test.desc, x, y, dst.At(x, y), golden.At(x, y))
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continue loop
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// Draw the same combination onto the actual dst using the optimized DrawMask implementation.
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DrawMask(dst, image.Rect(0, 0, 16, 16), test.src, image.ZP, test.mask, image.ZP, test.op)
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if image.Pt(8, 8).In(r) {
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// Check that the resultant pixel at (8, 8) matches what we expect
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// (the expected value can be verified by hand).
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if !eq(dst.At(8, 8), test.expected) {
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t.Errorf("draw %v %s on %T: at (8, 8) %v versus %v",
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r, test.desc, dst, dst.At(8, 8), test.expected)
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continue
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}
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}
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// Check that the resultant dst image matches the golden output.
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for y := b.Min.Y; y < b.Max.Y; y++ {
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for x := b.Min.X; x < b.Max.X; x++ {
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if !eq(dst.At(x, y), golden.At(x, y)) {
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t.Errorf("draw %v %s on %T: at (%d, %d), %v versus golden %v",
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r, test.desc, dst, x, y, dst.At(x, y), golden.At(x, y))
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continue loop
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}
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}
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}
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}
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