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ui: Reduce members from uiContext

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This commit is contained in:
Hajime Hoshi 2019-12-16 02:10:58 +09:00
parent 97ddef0047
commit 664cf62a29
1 changed files with 32 additions and 17 deletions
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49
uicontext.go
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@ -66,10 +66,7 @@ type uiContext struct {
game Game
offscreen *Image
screen *Image
screenScale float64
scaleForWindow float64
offsetX float64
offsetY float64
outsideSizeUpdated bool
outsideWidth float64
@ -156,17 +153,32 @@ func (c *uiContext) updateOffscreen() {
d := uiDriver().DeviceScaleFactor()
c.screen = newScreenFramebufferImage(int(c.outsideWidth*d), int(c.outsideHeight*d))
if uiDriver().CanHaveWindow() && !uiDriver().IsFullscreen() {
c.setScaleForWindow(c.screenScale() / d)
}
}
func (c *uiContext) screenScale() float64 {
if c.offscreen == nil {
return 0
}
sw, sh := c.offscreen.Size()
d := uiDriver().DeviceScaleFactor()
scaleX := c.outsideWidth / float64(sw) * d
scaleY := c.outsideHeight / float64(sh) * d
c.screenScale = math.Min(scaleX, scaleY)
if uiDriver().CanHaveWindow() && !uiDriver().IsFullscreen() {
c.setScaleForWindow(c.screenScale / d)
}
return math.Min(scaleX, scaleY)
}
width := float64(sw) * c.screenScale
height := float64(sh) * c.screenScale
c.offsetX = (c.outsideWidth*d - width) / 2
c.offsetY = (c.outsideHeight*d - height) / 2
func (c *uiContext) offsets() (float64, float64) {
if c.offscreen == nil {
return 0, 0
}
sw, sh := c.offscreen.Size()
d := uiDriver().DeviceScaleFactor()
s := c.screenScale()
width := float64(sw) * s
height := float64(sh) * s
return (c.outsideWidth*d - width) / 2, (c.outsideHeight*d - height) / 2
}
func (c *uiContext) Update(afterFrameUpdate func()) error {
@ -201,25 +213,26 @@ func (c *uiContext) Update(afterFrameUpdate func()) error {
op := &DrawImageOptions{}
s := c.screenScale()
switch vd := graphicsDriver().VDirection(); vd {
case driver.VDownward:
// c.screen is special: its Y axis is down to up,
// and the origin point is lower left.
op.GeoM.Scale(c.screenScale, -c.screenScale)
op.GeoM.Scale(s, -s)
_, h := c.offscreen.Size()
op.GeoM.Translate(0, float64(h)*c.screenScale)
op.GeoM.Translate(0, float64(h)*s)
case driver.VUpward:
op.GeoM.Scale(c.screenScale, c.screenScale)
op.GeoM.Scale(s, s)
default:
panic(fmt.Sprintf("ebiten: invalid v-direction: %d", vd))
}
op.GeoM.Translate(c.offsetX, c.offsetY)
op.GeoM.Translate(c.offsets())
op.CompositeMode = CompositeModeCopy
// filterScreen works with >=1 scale, but does not well with <1 scale.
// Use regular FilterLinear instead so far (#669).
if c.screenScale >= 1 {
if s >= 1 {
op.Filter = filterScreen
} else {
op.Filter = FilterLinear
@ -234,5 +247,7 @@ func (c *uiContext) Update(afterFrameUpdate func()) error {
func (c *uiContext) AdjustPosition(x, y float64) (float64, float64) {
d := uiDriver().DeviceScaleFactor()
return (x*d - c.offsetX) / c.screenScale, (y*d - c.offsetY) / c.screenScale
ox, oy := c.offsets()
s := c.screenScale()
return (x*d - ox) / s, (y*d - oy) / s
}