mth/ebiten
1
0
Fork 0
mirror of https://github.com/hajimehoshi/ebiten.git synced 2025-02-03 14:34:26 +01:00
Code Issues Packages Projects Releases Wiki Activity

uidriver/ui: Reduce calls of syscall/js

Browse Source
This commit is contained in:
Hajime Hoshi 2019-10-16 02:56:58 +09:00
parent 72248fa3ef
commit 43a8881ab8
1 changed files with 22 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

42
internal/uidriver/js/ui.go
View File

@ -45,6 +45,10 @@ type UserInterface struct {
context driver.UIContext context driver.UIContext
input Input input Input
// pseudoScale is a value to store 'scale'. This doesn't affect actual rendering.
// This is for backward compatibility.
pseudoScale float64
} }
var theUI = &UserInterface{ var theUI = &UserInterface{
@ -78,11 +82,11 @@ func (u *UserInterface) SetScreenSize(width, height int) {
} }
func (u *UserInterface) SetScreenScale(scale float64) { func (u *UserInterface) SetScreenScale(scale float64) {
u.scale = scale u.pseudoScale = scale
} }
func (u *UserInterface) ScreenScale() float64 { func (u *UserInterface) ScreenScale() float64 {
return u.scale return u.pseudoScale
} }
func (u *UserInterface) SetFullscreen(fullscreen bool) { func (u *UserInterface) SetFullscreen(fullscreen bool) {
@ -117,8 +121,8 @@ func (u *UserInterface) adjustPosition(x, y int) (int, int) {
rect := canvas.Call("getBoundingClientRect") rect := canvas.Call("getBoundingClientRect")
x -= rect.Get("left").Int() x -= rect.Get("left").Int()
y -= rect.Get("top").Int() y -= rect.Get("top").Int()
scale := u.getScale() s := u.scale
return int(float64(x) / scale), int(float64(y) / scale) return int(float64(x) / s), int(float64(y) / s)
} }
func (u *UserInterface) IsCursorVisible() bool { func (u *UserInterface) IsCursorVisible() bool {
@ -162,25 +166,13 @@ func (u *UserInterface) DeviceScaleFactor() float64 {
return devicescale.GetAt(0, 0) return devicescale.GetAt(0, 0)
} }
func (u *UserInterface) getScale() float64 {
body := document.Get("body")
bw := body.Get("clientWidth").Float()
bh := body.Get("clientHeight").Float()
sw := bw / float64(u.width)
sh := bh / float64(u.height)
if sw > sh {
return sh
}
return sw
}
func (u *UserInterface) actualScreenScale() float64 { func (u *UserInterface) actualScreenScale() float64 {
// CSS imageRendering property seems useful to enlarge the screen, // CSS imageRendering property seems useful to enlarge the screen,
// but doesn't work in some cases (#306): // but doesn't work in some cases (#306):
// * Chrome just after restoring the lost context // * Chrome just after restoring the lost context
// * Safari // * Safari
// Let's use the devicePixelRatio as it is here. // Let's use the devicePixelRatio as it is here.
return u.getScale() * devicescale.GetAt(0, 0) return u.scale * devicescale.GetAt(0, 0)
} }
func (u *UserInterface) updateSize() { func (u *UserInterface) updateSize() {
@ -472,13 +464,23 @@ func (u *UserInterface) setScreenSize(width, height int) bool {
} }
func (u *UserInterface) updateScreenSize() { func (u *UserInterface) updateScreenSize() {
body := document.Get("body")
bw := body.Get("clientWidth").Float()
bh := body.Get("clientHeight").Float()
sw := bw / float64(u.width)
sh := bh / float64(u.height)
if sw > sh {
u.scale = sh
} else {
u.scale = sw
}
canvas.Set("width", int(float64(u.width)*u.actualScreenScale())) canvas.Set("width", int(float64(u.width)*u.actualScreenScale()))
canvas.Set("height", int(float64(u.height)*u.actualScreenScale())) canvas.Set("height", int(float64(u.height)*u.actualScreenScale()))
canvasStyle := canvas.Get("style") canvasStyle := canvas.Get("style")
s := u.getScale() cssWidth := int(float64(u.width) * u.scale)
cssWidth := int(float64(u.width) * s) cssHeight := int(float64(u.height) * u.scale)
cssHeight := int(float64(u.height) * s)
canvasStyle.Set("width", strconv.Itoa(cssWidth)+"px") canvasStyle.Set("width", strconv.Itoa(cssWidth)+"px")
canvasStyle.Set("height", strconv.Itoa(cssHeight)+"px") canvasStyle.Set("height", strconv.Itoa(cssHeight)+"px")