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webview_edge.cpp: Enabling DPI awareness

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This commit is contained in:
Giovanni Patruno
2019-12-27 12:00:30 +01:00
committed by Richard Hozák
parent 263b6a43c6
commit d46cc70c10
1 changed files with 47 additions and 0 deletions
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47
webview-sys/webview_edge.cpp
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@@ -64,6 +64,36 @@ inline std::string html_from_uri(const char *s)
LRESULT CALLBACK WebviewWndProc(HWND hwnd, UINT msg, WPARAM wp, LPARAM lp);
class browser_window {
private:
bool EnableDpiAwareness() {
auto lib_user32 = GetModuleHandleW(L"user32.dll");
if(lib_user32) {
auto fn_set_thread_dpi_awareness_context =
reinterpret_cast<decltype(&SetThreadDpiAwarenessContext)>(
GetProcAddress(lib_user32, "SetThreadDpiAwarenessContext")
);
if (
fnSetThreadDpiAwarenessContext
&& fn_set_thread_dpi_awareness_context(DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE_V2)
) {
return true;
}
}
auto lib_shcore = LoadLibraryW(L"shcore.dll");
if (!lib_shcore) {
return false;
}
auto fn_set_process_dpi_awareness =
reinterpret_cast<HRESULT (WINAPI *)(int)>(
GetProcAddress(lib_shcore, "SetProcessDpiAwareness")
);
if (!fn_set_process_dpi_awareness || !fn_set_process_dpi_awareness(2)) {
FreeLibrary(lib_shcore);
return false;
}
FreeLibrary(lib_shcore);
return true;
}
public:
browser_window(msg_cb_t cb, const char* title, int width, int height, bool resizable, bool frameless)
: m_cb(cb)
@@ -78,6 +108,8 @@ public:
wc.lpszClassName = L"webview";
RegisterClassEx(&wc);
EnableDpiAwareness();
DWORD style = WS_OVERLAPPEDWINDOW;
if (!resizable) {
style &= ~(WS_SIZEBOX);
@@ -245,6 +277,21 @@ LRESULT CALLBACK WebviewWndProc(HWND hwnd, UINT msg, WPARAM wp, LPARAM lp)
case WM_SIZE:
w->resize();
break;
case WM_DPICHANGED:
auto rect = reinterpret_cast<LPRECT>(lp);
auto x = rect->left;
auto y = rect->top;
auto w = rect->right - x;
auto h = rect->bottom - y;
SetWindowPos(hwnd, nullptr, x, y, w, h, SWP_NOZORDER);
auto monitor = MonitorFromWindow(hwnd, MONITOR_DEFAULTTONEAREST);
MONITORINFOEXW mi{};
mi.cbSize = sizeof(MONITORINFOEXW);
GetMonitorInfoW(monitor, &mi);
auto scale = LOWORD(wp) / (float)USER_DEFAULT_SCREEN_DPI;
auto xres = mi.rcMonitor.right - mi.rcMonitor.left;
auto yres = mi.rcMonitor.bottom - mi.rcMonitor.top;
break;
case WM_CLOSE:
DestroyWindow(hwnd);
break;