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restorable: Performance tuning

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This is based on the result of examples/set (Wasm).
This commit is contained in:
Hajime Hoshi 2019-10-04 02:02:33 +09:00
parent 382f6365fd
commit 7e7751bd43
1 changed files with 16 additions and 6 deletions
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22
internal/restorable/rect.go
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@ -24,7 +24,8 @@ import (
type rectToPixels struct {
m map[image.Rectangle][]byte
last image.Rectangle
lastr image.Rectangle
lastpix []byte
}
func (rtp *rectToPixels) addOrReplace(pixels []byte, x, y, width, height int) {
@ -44,6 +45,9 @@ func (rtp *rectToPixels) addOrReplace(pixels []byte, x, y, width, height int) {
if r == newr {
// Replace the region.
rtp.m[r] = copied
if r == rtp.lastr {
rtp.lastpix = copied
}
return
}
if r.Overlaps(newr) {
@ -53,6 +57,9 @@ func (rtp *rectToPixels) addOrReplace(pixels []byte, x, y, width, height int) {
// Add the region.
rtp.m[newr] = copied
if newr == rtp.lastr {
rtp.lastpix = copied
}
}
func (rtp *rectToPixels) remove(x, y, width, height int) {
@ -74,15 +81,19 @@ func (rtp *rectToPixels) at(i, j int) (byte, byte, byte, byte, bool) {
return 0, 0, 0, 0, false
}
var pix []byte
var r *image.Rectangle
pt := image.Pt(i, j)
if pt.In(rtp.last) {
r = &rtp.last
if pt := image.Pt(i, j); pt.In(rtp.lastr) {
r = &rtp.lastr
pix = rtp.lastpix
} else {
for rr := range rtp.m {
if pt.In(rr) {
r = &rr
rtp.last = rr
rtp.lastr = rr
pix = rtp.m[rr]
rtp.lastpix = pix
break
}
}
@ -92,7 +103,6 @@ func (rtp *rectToPixels) at(i, j int) (byte, byte, byte, byte, bool) {
return 0, 0, 0, 0, false
}
pix := rtp.m[*r]
idx := 4 * ((j-r.Min.Y)*r.Dx() + (i - r.Min.X))
return pix[idx], pix[idx+1], pix[idx+2], pix[idx+3], true
}