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mipmap: Refactoring

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This commit is contained in:
Hajime Hoshi 2020-07-16 00:52:41 +09:00
parent 38d3811f13
commit 04b26adf3d
1 changed files with 31 additions and 27 deletions
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58
internal/mipmap/mipmap.go
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@ -110,32 +110,6 @@ func (m *Mipmap) DrawImage(src *Mipmap, bounds image.Rectangle, geom GeoM, color
level := src.mipmapLevel(geom, bounds.Dx(), bounds.Dy(), filter)
if level > 0 {
// If the image can be scaled into 0 size, adjust the level. (#839)
w, h := bounds.Dx(), bounds.Dy()
for level >= 0 {
s := 1 << uint(level)
if w/s == 0 || h/s == 0 {
level--
continue
}
break
}
if level < 0 {
// As the render source is too small, nothing is rendered.
return
}
}
if level > 6 {
level = 6
}
// If tooBigScale is 4, level -10 means that the maximum scale is 4 * 2^10 = 4096. This should be enough.
if level < -10 {
level = -10
}
cr, cg, cb, ca := float32(1), float32(1), float32(1), float32(1)
if colorm != nil && colorm.ScaleOnly() {
body, _ := colorm.UnsafeElements()
@ -331,6 +305,7 @@ func (m *Mipmap) mipmapLevel(geom GeoM, width, height int, filter driver.Filter)
if !graphicsDriver.HasHighPrecisionFloat() {
tooBigScale = 4
}
if sx, sy := geomScaleSize(&geom); sx >= tooBigScale || sy >= tooBigScale {
// If the filter is not nearest, the target needs to be rendered with graduation. Don't use mipmaps.
if filter != driver.FilterNearest {
@ -354,6 +329,12 @@ func (m *Mipmap) mipmapLevel(geom GeoM, width, height int, filter driver.Filter)
break
}
}
// If tooBigScale is 4, level -10 means that the maximum scale is 4 * 2^10 = 4096. This should be
// enough.
if level < -10 {
level = -10
}
return level
}
@ -365,7 +346,30 @@ func (m *Mipmap) mipmapLevel(geom GeoM, width, height int, filter driver.Filter)
}
// This is a separate function for testing.
return MipmapLevelForDownscale(det)
level := MipmapLevelForDownscale(det)
if level > 0 {
// If the image can be scaled into 0 size, adjust the level. (#839)
w, h := width, height
for level >= 0 {
s := 1 << uint(level)
if w/s == 0 || h/s == 0 {
level--
continue
}
break
}
if level < 0 {
// As the render source is too small, nothing is rendered.
return 0
}
}
if level > 6 {
level = 6
}
return level
}
func MipmapLevelForDownscale(det float32) int {