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Viewports: only apply AdjustWindowRectExForDpi() when Per-Monitor DPI Aware V2. Amend 54a865e. (#8897)

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Arghhh.
This commit is contained in:
ocornut
2026-03-31 20:22:53 +02:00
parent 54a865e472
commit 64f88934a7
1 changed files with 21 additions and 4 deletions
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backends/imgui_impl_win32.cpp
+21 -4
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@@ -126,6 +126,7 @@ typedef BOOL(WINAPI* PFN_AdjustWindowRectExForDpi)(LPRECT, DWORD, BOOL, DWORD, U
static void ImGui_ImplWin32_InitMultiViewportSupport(bool platform_has_own_dc);
static void ImGui_ImplWin32_ShutdownMultiViewportSupport();
static void ImGui_ImplWin32_UpdateMonitors();
static bool ImGui_ImplWin32_IsDpiAwarenessPerMonitorAwareV2();
struct ImGui_ImplWin32_Data
{
@@ -138,6 +139,7 @@ struct ImGui_ImplWin32_Data
ImGuiMouseCursor LastMouseCursor;
UINT32 KeyboardCodePage;
bool WantUpdateMonitors;
bool IsPerMonitorDpiAwareV2;
PFN_AdjustWindowRectExForDpi AdjustWindowRectExForDpi;
#ifndef IMGUI_IMPL_WIN32_DISABLE_GAMEPAD
@@ -218,6 +220,7 @@ static bool ImGui_ImplWin32_InitEx(void* hwnd, bool platform_has_own_dc)
if (HINSTANCE user32_dll = ::GetModuleHandleA("user32.dll"))
bd->AdjustWindowRectExForDpi = (PFN_AdjustWindowRectExForDpi)::GetProcAddress(user32_dll, "AdjustWindowRectExForDpi");
bd->IsPerMonitorDpiAwareV2 = ImGui_ImplWin32_IsDpiAwarenessPerMonitorAwareV2();
// Dynamically load XInput library
#ifndef IMGUI_IMPL_WIN32_DISABLE_GAMEPAD
@@ -1010,9 +1013,11 @@ DECLARE_HANDLE(DPI_AWARENESS_CONTEXT);
#ifndef DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE_V2
#define DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE_V2 (DPI_AWARENESS_CONTEXT)-4
#endif
typedef HRESULT(WINAPI* PFN_SetProcessDpiAwareness)(PROCESS_DPI_AWARENESS); // Shcore.lib + dll, Windows 8.1+
typedef HRESULT(WINAPI* PFN_GetDpiForMonitor)(HMONITOR, MONITOR_DPI_TYPE, UINT*, UINT*); // Shcore.lib + dll, Windows 8.1+
typedef DPI_AWARENESS_CONTEXT(WINAPI* PFN_SetThreadDpiAwarenessContext)(DPI_AWARENESS_CONTEXT); // User32.lib + dll, Windows 10 v1607+ (Creators Update)
typedef HRESULT(WINAPI* PFN_SetProcessDpiAwareness)(PROCESS_DPI_AWARENESS); // Shcore.lib + dll, Windows 8.1+
typedef HRESULT(WINAPI* PFN_GetDpiForMonitor)(HMONITOR, MONITOR_DPI_TYPE, UINT*, UINT*); // Shcore.lib + dll, Windows 8.1+
typedef DPI_AWARENESS_CONTEXT(WINAPI* PFN_SetThreadDpiAwarenessContext)(DPI_AWARENESS_CONTEXT); // User32.lib + dll, Windows 10 v1607+ (Creators Update)
typedef DPI_AWARENESS_CONTEXT(WINAPI* PFN_GetThreadDpiAwarenessContext)(); // "
typedef BOOL(WINAPI* PFN_AreDpiAwarenessContextsEqual)(DPI_AWARENESS_CONTEXT, DPI_AWARENESS_CONTEXT); // "
// Helper function to enable DPI awareness without setting up a manifest
void ImGui_ImplWin32_EnableDpiAwareness()
@@ -1044,6 +1049,18 @@ void ImGui_ImplWin32_EnableDpiAwareness()
#endif
}
static bool ImGui_ImplWin32_IsDpiAwarenessPerMonitorAwareV2()
{
if (!_IsWindows10OrGreater())
return false;
static HINSTANCE user32_dll = ::GetModuleHandleA("user32.dll");
PFN_GetThreadDpiAwarenessContext GetThreadDpiAwarenessContextFn = (PFN_GetThreadDpiAwarenessContext)::GetProcAddress(user32_dll, "GetThreadDpiAwarenessContext");
PFN_AreDpiAwarenessContextsEqual AreDpiAwarenessContextsEqualFn = (PFN_AreDpiAwarenessContextsEqual)::GetProcAddress(user32_dll, "AreDpiAwarenessContextsEqual");
if (GetThreadDpiAwarenessContextFn && AreDpiAwarenessContextsEqualFn)
return AreDpiAwarenessContextsEqualFn(GetThreadDpiAwarenessContextFn(), DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE_V2) != 0;
return false;
}
#if defined(_MSC_VER) && !defined(NOGDI)
#pragma comment(lib, "gdi32") // Link with gdi32.lib for GetDeviceCaps(). MinGW will require linking with '-lgdi32'
#endif
@@ -1165,7 +1182,7 @@ static HWND ImGui_ImplWin32_GetHwndFromViewport(ImGuiViewport* viewport)
static void ImGui_ImplWin32_AdjustWindowRect(ImGuiViewport* viewport, RECT* rect, DWORD style, DWORD ex_style)
{
ImGui_ImplWin32_Data* bd = ImGui_ImplWin32_GetBackendData();
if (bd->AdjustWindowRectExForDpi)
if (bd->AdjustWindowRectExForDpi && bd->IsPerMonitorDpiAwareV2)
{
UINT dpi = (UINT)(viewport->DpiScale * 96.0f + 0.5f);
if (dpi != 0 && bd->AdjustWindowRectExForDpi(rect, style, FALSE, ex_style, dpi))