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app/internal/window: implement GetDpiForMonitor fallback for < Win 8.1

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Signed-off-by: Elias Naur <mail@eliasnaur.com>
This commit is contained in:
Elias Naur
2019-11-05 18:20:36 +01:00
parent 299e966816
commit ef78ba37f6
1 changed files with 31 additions and 10 deletions
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app/internal/window/os_windows.go
+31 -10
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@@ -79,6 +79,8 @@ const (
_INFINITE = 0xFFFFFFFF
_LOGPIXELSX = 88
_MDT_EFFECTIVE_DPI = 0
_MONITOR_DEFAULTTOPRIMARY = 1
@@ -201,12 +203,7 @@ func NewWindow(window Callbacks, opts *Options) error {
func createNativeWindow(opts *Options) (*window, error) {
setProcessDPIAware()
screenDC, err := getDC(0)
if err != nil {
return nil, err
}
cfg := configForDC(screenDC)
releaseDC(screenDC)
cfg := configForDC()
hInst, err := getModuleHandle()
if err != nil {
return nil, err
@@ -412,7 +409,7 @@ func (w *window) draw(sync bool) {
getClientRect(w.hwnd, &r)
w.width = int(r.right - r.left)
w.height = int(r.bottom - r.top)
cfg := configForDC(w.hdc)
cfg := configForDC()
cfg.now = time.Now()
w.w.Event(FrameEvent{
FrameEvent: system.FrameEvent{
@@ -483,9 +480,8 @@ func convertKeyCode(code uintptr) (rune, bool) {
return r, true
}
func configForDC(hdc syscall.Handle) config {
hmon := monitorFromPoint(point{}, _MONITOR_DEFAULTTOPRIMARY)
dpi := getDpiForMonitor(hmon, _MDT_EFFECTIVE_DPI)
func configForDC() config {
dpi := getSystemDPI()
const inchPrDp = 1.0 / 96.0
ppdp := float32(dpi) * inchPrDp
return config{
@@ -533,6 +529,9 @@ var (
shcore = syscall.NewLazySystemDLL("shcore")
_GetDpiForMonitor = shcore.NewProc("GetDpiForMonitor")
gdi32 = syscall.NewLazySystemDLL("gdi32")
_GetDeviceCaps = gdi32.NewProc("GetDeviceCaps")
)
func getModuleHandle() (syscall.Handle, error) {
@@ -601,12 +600,34 @@ func getDC(hwnd syscall.Handle) (syscall.Handle, error) {
return syscall.Handle(hdc), nil
}
func getDeviceCaps(hdc syscall.Handle, index int32) int {
c, _, _ := _GetDeviceCaps.Call(uintptr(hdc), uintptr(index))
return int(c)
}
func getDpiForMonitor(hmonitor syscall.Handle, dpiType uint32) int {
var dpiX, dpiY uintptr
_GetDpiForMonitor.Call(uintptr(hmonitor), uintptr(dpiType), uintptr(unsafe.Pointer(&dpiX)), uintptr(unsafe.Pointer(&dpiY)))
return int(dpiX)
}
// getSystemDPI returns the effective DPI of the system.
func getSystemDPI() int {
// Check for GetDpiForMonitor, introduced in Windows 8.1.
if _GetDpiForMonitor.Find() == nil {
hmon := monitorFromPoint(point{}, _MONITOR_DEFAULTTOPRIMARY)
return getDpiForMonitor(hmon, _MDT_EFFECTIVE_DPI)
} else {
// Fall back to the physical device DPI.
screenDC, err := getDC(0)
if err != nil {
return 96
}
defer releaseDC(screenDC)
return getDeviceCaps(screenDC, _LOGPIXELSX)
}
}
func getKeyState(nVirtKey int32) int16 {
c, _, _ := _GetKeyState.Call(uintptr(nVirtKey))
return int16(c)