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internal/restorable: use a cache for pixels at readPixelsFromGPU

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Updates #2375
This commit is contained in:
Hajime Hoshi 2023-03-08 16:27:36 +09:00
parent 7f182e7814
commit f298b9541b
1 changed files with 17 additions and 10 deletions
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27
internal/restorable/image.go
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@ -124,12 +124,11 @@ type Image struct {
// staleRegions is not used when AlwaysReadPixelsFromGPU() returns true.
staleRegions []image.Rectangle
// pixelsForRestore is cached byte slices for pixels.
// pixelsForRestore is just a cache to avoid allocations (#2375).
// pixelsForRestore is used only at restore.
// pixelsCache is cached byte slices for pixels.
// pixelsCache is just a cache to avoid allocations (#2375).
//
// A key is the region and a value is a byte slice for the region.
pixelsForRestore map[image.Rectangle][]byte
pixelsCache map[image.Rectangle][]byte
// regionsForRestore is cached regions.
// regionsForRestore is just a cache to avoid allocations (#2375).
@ -485,7 +484,15 @@ func (i *Image) readPixelsFromGPU(graphicsDriver graphicsdriver.Graphics) error
continue
}
pix := make([]byte, 4*r.Dx()*r.Dy())
if i.pixelsCache == nil {
i.pixelsCache = map[image.Rectangle][]byte{}
}
pix, ok := i.pixelsCache[r]
if !ok {
pix = make([]byte, 4*r.Dx()*r.Dy())
i.pixelsCache[r] = pix
}
if err := i.image.ReadPixels(graphicsDriver, pix, r.Min.X, r.Min.Y, r.Dx(), r.Dy()); err != nil {
return err
}
@ -612,14 +619,14 @@ func (i *Image) restore(graphicsDriver graphicsdriver.Graphics) error {
continue
}
if i.pixelsForRestore == nil {
i.pixelsForRestore = map[image.Rectangle][]byte{}
if i.pixelsCache == nil {
i.pixelsCache = map[image.Rectangle][]byte{}
}
pix, ok := i.pixelsForRestore[r]
pix, ok := i.pixelsCache[r]
if !ok {
pix = make([]byte, 4*r.Dx()*r.Dy())
i.pixelsForRestore[r] = pix
i.pixelsCache[r] = pix
}
if err := gimg.ReadPixels(graphicsDriver, pix, r.Min.X, r.Min.Y, r.Dx(), r.Dy()); err != nil {
return err
@ -645,7 +652,7 @@ func (i *Image) Dispose() {
i.image.Dispose()
i.image = nil
i.basePixels = Pixels{}
i.pixelsForRestore = nil
i.pixelsCache = nil
i.clearDrawTrianglesHistory()
i.stale = false
i.staleRegions = i.staleRegions[:0]