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devicescale: Bug fix: Crash on Wine

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GetWindowDC(0) doesn't work on Wine. Let that return an arbitrary
scale 1 in this case.

Fixes #738
This commit is contained in:
Hajime Hoshi 2018-11-24 11:06:04 +09:00
parent b48d501bc0
commit d165673789
1 changed files with 66 additions and 13 deletions
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79
internal/devicescale/impl_windows.go
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@ -57,6 +57,16 @@ var (
var shcoreAvailable = false
type winErr struct {
FuncName string
Code syscall.Errno
Return uintptr
}
func (e *winErr) Error() string {
return fmt.Sprintf("devicescale: %s failed: error code: %d", e.FuncName, e.Code)
}
func init() {
if shcore.Load() == nil {
shcoreAvailable = true
@ -66,10 +76,16 @@ func init() {
func setProcessDPIAware() error {
r, _, e := syscall.Syscall(procSetProcessDPIAware.Addr(), 0, 0, 0, 0)
if e != 0 {
return fmt.Errorf("devicescale: SetProcessDPIAware failed: error code: %d", e)
return &winErr{
FuncName: "SetProcessDPIAware",
Code: e,
}
}
if r == 0 {
return fmt.Errorf("devicescale: SetProcessDPIAware failed: returned value: %d", r)
return &winErr{
FuncName: "SetProcessDPIAware",
Return: r,
}
}
return nil
}
@ -77,10 +93,16 @@ func setProcessDPIAware() error {
func getWindowDC(hwnd uintptr) (uintptr, error) {
r, _, e := syscall.Syscall(procGetWindowDC.Addr(), 1, hwnd, 0, 0)
if e != 0 {
return 0, fmt.Errorf("devicescale: GetWindowDC failed: error code: %d", e)
return 0, &winErr{
FuncName: "GetWindowDC",
Code: e,
}
}
if r == 0 {
return 0, fmt.Errorf("devicescale: GetWindowDC failed: returned value: %d", r)
return 0, &winErr{
FuncName: "GetWindowDC",
Return: r,
}
}
return r, nil
}
@ -88,10 +110,16 @@ func getWindowDC(hwnd uintptr) (uintptr, error) {
func releaseDC(hwnd, hdc uintptr) error {
r, _, e := syscall.Syscall(procReleaseDC.Addr(), 2, hwnd, hdc, 0)
if e != 0 {
return fmt.Errorf("devicescale: ReleaseDC failed: error code: %d", e)
return &winErr{
FuncName: "ReleaseDC",
Code: e,
}
}
if r == 0 {
return fmt.Errorf("devicescale: ReleaseDC failed: returned value: %d", r)
return &winErr{
FuncName: "ReleaseDC",
Return: r,
}
}
return nil
}
@ -99,7 +127,10 @@ func releaseDC(hwnd, hdc uintptr) error {
func getDeviceCaps(hdc uintptr, nindex int) (int, error) {
r, _, e := syscall.Syscall(procGetDeviceCaps.Addr(), 2, hdc, uintptr(nindex), 0)
if e != 0 {
return 0, fmt.Errorf("devicescale: GetDeviceCaps failed: error code: %d", e)
return 0, &winErr{
FuncName: "GetDeviceCaps",
Code: e,
}
}
return int(r), nil
}
@ -107,10 +138,16 @@ func getDeviceCaps(hdc uintptr, nindex int) (int, error) {
func monitorFromRect(lprc uintptr, dwFlags int) (uintptr, error) {
r, _, e := syscall.Syscall(procMonitorFromRect.Addr(), 2, lprc, uintptr(dwFlags), 0)
if e != 0 {
return 0, fmt.Errorf("devicescale: MonitorFromRect failed: error code: %d", e)
return 0, &winErr{
FuncName: "MonitorFromRect",
Code: e,
}
}
if r == 0 {
return 0, fmt.Errorf("devicescale: MonitorFromRect failed: returned value: %d", r)
return 0, &winErr{
FuncName: "MonitorFromRect",
Return: r,
}
}
return r, nil
}
@ -118,10 +155,16 @@ func monitorFromRect(lprc uintptr, dwFlags int) (uintptr, error) {
func getMonitorInfo(hMonitor uintptr, lpMonitorInfo uintptr) error {
r, _, e := syscall.Syscall(procGetMonitorInfo.Addr(), 2, hMonitor, lpMonitorInfo, 0)
if e != 0 {
return fmt.Errorf("devicescale: GetMonitorInfo failed: error code: %d", e)
return &winErr{
FuncName: "GetMonitorInfo",
Code: e,
}
}
if r == 0 {
return fmt.Errorf("devicescale: GetMonitorInfo failed: returned value: %d", r)
return &winErr{
FuncName: "GetMonitorInfo",
Return: r,
}
}
return nil
}
@ -130,10 +173,16 @@ func getDpiForMonitor(hMonitor uintptr, dpiType uintptr, dpiX, dpiY uintptr) err
r, _, e := syscall.Syscall6(procGetDpiForMonitor.Addr(), 4,
hMonitor, dpiType, dpiX, dpiY, 0, 0)
if e != 0 {
return fmt.Errorf("devicescale: GetDpiForMonitor failed: error code: %d", e)
return &winErr{
FuncName: "GetDpiForMonitor",
Code: e,
}
}
if r != 0 {
return fmt.Errorf("devicescale: GetDpiForMonitor failed: returned value: %d", r)
return &winErr{
FuncName: "GetDpiForMonitor",
Return: r,
}
}
return nil
}
@ -141,6 +190,10 @@ func getDpiForMonitor(hMonitor uintptr, dpiType uintptr, dpiX, dpiY uintptr) err
func getFromLogPixelSx() float64 {
dc, err := getWindowDC(0)
if err != nil {
// On Wine, it looks like GetWindowDC(0) doesn't work (#738).
if err.(*winErr).Code == 1400 {
return 1
}
panic(err)
}