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graphics: Simplify mipmap calculation

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This commit is contained in:
Hajime Hoshi 2018-08-03 00:02:49 +09:00
parent d17a6dde9b
commit bac0431c9f
2 changed files with 8 additions and 12 deletions
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12
image.go
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@ -275,18 +275,18 @@ func (i *Image) DrawImage(img *Image, options *DrawImageOptions) error {
b *= float32(s)
c *= float32(s)
d *= float32(s)
sx0 = int(math.Ceil(float64(sx0) / float64(s)))
sy0 = int(math.Ceil(float64(sy0) / float64(s)))
sx1 = int(math.Ceil(float64(sx1) / float64(s)))
sy1 = int(math.Ceil(float64(sy1) / float64(s)))
sx0 = sx0 / s
sy0 = sy0 / s
sx1 = sx1 / s
sy1 = sy1 / s
}
w, h = img.shareableImages[len(img.shareableImages)-1].Size()
for len(img.shareableImages) < level+1 {
lastl := len(img.shareableImages) - 1
src := img.shareableImages[lastl]
w2 := int(math.Ceil(float64(w) / 2.0))
h2 := int(math.Ceil(float64(h) / 2.0))
w2 := w / 2
h2 := h / 2
if w2 == 0 || h2 == 0 {
break
}

8
image_test.go
View File

@ -863,10 +863,6 @@ func TestSprites(t *testing.T) {
}
func TestMipmap(t *testing.T) {
ceilDiv := func(x, y int) int {
return int(math.Ceil(float64(x) / float64(y)))
}
src, _, err := openEbitenImage()
if err != nil {
t.Fatal(err)
@ -874,14 +870,14 @@ func TestMipmap(t *testing.T) {
}
w, h := src.Size()
l1, _ := NewImage(ceilDiv(w, 2), ceilDiv(h, 2), FilterDefault)
l1, _ := NewImage(w/2, h/2, FilterDefault)
op := &DrawImageOptions{}
op.GeoM.Scale(1/2.0, 1/2.0)
op.Filter = FilterLinear
l1.DrawImage(src, op)
l1w, l1h := l1.Size()
l2, _ := NewImage(ceilDiv(l1w, 2), ceilDiv(l1h, 2), FilterDefault)
l2, _ := NewImage(l1w/2, l1h/2, FilterDefault)
op = &DrawImageOptions{}
op.GeoM.Scale(1/2.0, 1/2.0)
op.Filter = FilterLinear