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vector: reduce memory allocations in the utility functions

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This commit is contained in:
Hajime Hoshi 2024-08-10 05:01:38 +09:00
parent 38b8ba5677
commit 071024e89f
1 changed files with 38 additions and 10 deletions
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48
vector/util.go
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@ -18,6 +18,7 @@ import (
"image"
"image/color"
"math"
"sync"
"github.com/hajimehoshi/ebiten/v2"
)
@ -27,6 +28,18 @@ var (
whiteSubImage = whiteImage.SubImage(image.Rect(1, 1, 2, 2)).(*ebiten.Image)
)
var (
cachedVertices []ebiten.Vertex
cachedIndices []uint16
cacheM sync.Mutex
)
func useCachedVerticesAndIndices(fn func([]ebiten.Vertex, []uint16) (vs []ebiten.Vertex, is []uint16)) {
cacheM.Lock()
defer cacheM.Unlock()
cachedVertices, cachedIndices = fn(cachedVertices[:0], cachedIndices[:0])
}
func init() {
b := whiteImage.Bounds()
pix := make([]byte, 4*b.Dx()*b.Dy())
@ -63,9 +76,12 @@ func StrokeLine(dst *ebiten.Image, x0, y0, x1, y1 float32, strokeWidth float32,
path.LineTo(x1, y1)
strokeOp := &StrokeOptions{}
strokeOp.Width = strokeWidth
vs, is := path.AppendVerticesAndIndicesForStroke(nil, nil, strokeOp)
drawVerticesForUtil(dst, vs, is, clr, antialias)
useCachedVerticesAndIndices(func(vs []ebiten.Vertex, is []uint16) ([]ebiten.Vertex, []uint16) {
vs, is = path.AppendVerticesAndIndicesForStroke(vs, is, strokeOp)
drawVerticesForUtil(dst, vs, is, clr, antialias)
return vs, is
})
}
// DrawFilledRect fills a rectangle with the specified width and color.
@ -75,9 +91,12 @@ func DrawFilledRect(dst *ebiten.Image, x, y, width, height float32, clr color.Co
path.LineTo(x, y+height)
path.LineTo(x+width, y+height)
path.LineTo(x+width, y)
vs, is := path.AppendVerticesAndIndicesForFilling(nil, nil)
drawVerticesForUtil(dst, vs, is, clr, antialias)
useCachedVerticesAndIndices(func(vs []ebiten.Vertex, is []uint16) ([]ebiten.Vertex, []uint16) {
vs, is = path.AppendVerticesAndIndicesForFilling(vs, is)
drawVerticesForUtil(dst, vs, is, clr, antialias)
return vs, is
})
}
// StrokeRect strokes a rectangle with the specified width and color.
@ -94,18 +113,24 @@ func StrokeRect(dst *ebiten.Image, x, y, width, height float32, strokeWidth floa
strokeOp := &StrokeOptions{}
strokeOp.Width = strokeWidth
strokeOp.MiterLimit = 10
vs, is := path.AppendVerticesAndIndicesForStroke(nil, nil, strokeOp)
drawVerticesForUtil(dst, vs, is, clr, antialias)
useCachedVerticesAndIndices(func(vs []ebiten.Vertex, is []uint16) ([]ebiten.Vertex, []uint16) {
vs, is = path.AppendVerticesAndIndicesForStroke(vs, is, strokeOp)
drawVerticesForUtil(dst, vs, is, clr, antialias)
return vs, is
})
}
// DrawFilledCircle fills a circle with the specified center position (cx, cy), the radius (r), width and color.
func DrawFilledCircle(dst *ebiten.Image, cx, cy, r float32, clr color.Color, antialias bool) {
var path Path
path.Arc(cx, cy, r, 0, 2*math.Pi, Clockwise)
vs, is := path.AppendVerticesAndIndicesForFilling(nil, nil)
drawVerticesForUtil(dst, vs, is, clr, antialias)
useCachedVerticesAndIndices(func(vs []ebiten.Vertex, is []uint16) ([]ebiten.Vertex, []uint16) {
vs, is = path.AppendVerticesAndIndicesForFilling(vs, is)
drawVerticesForUtil(dst, vs, is, clr, antialias)
return vs, is
})
}
// StrokeCircle strokes a circle with the specified center position (cx, cy), the radius (r), width and color.
@ -118,7 +143,10 @@ func StrokeCircle(dst *ebiten.Image, cx, cy, r float32, strokeWidth float32, clr
strokeOp := &StrokeOptions{}
strokeOp.Width = strokeWidth
vs, is := path.AppendVerticesAndIndicesForStroke(nil, nil, strokeOp)
drawVerticesForUtil(dst, vs, is, clr, antialias)
useCachedVerticesAndIndices(func(vs []ebiten.Vertex, is []uint16) ([]ebiten.Vertex, []uint16) {
vs, is = path.AppendVerticesAndIndicesForStroke(vs, is, strokeOp)
drawVerticesForUtil(dst, vs, is, clr, antialias)
return vs, is
})
}