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Backends: Win32: use SetProcessDpiAwarenessContext instead of SetThreadDpiAwarenessContext when available, to fix the OpenGL3 Win32 example DPI scaling issue. (#9403)

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MouriNaruto
2026-05-19 23:21:36 +08:00
committed by ocornut
parent e41d691da1
commit 3e7b79aa17
2 changed files with 13 additions and 1 deletions
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9
backends/imgui_impl_win32.cpp
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@@ -21,6 +21,7 @@
// CHANGELOG
// (minor and older changes stripped away, please see git history for details)
// 2026-05-19: DPI: ImGui_ImplWin32_EnableDpiAwareness() helper uses SetProcessDpiAwarenessContext() instead of SetThreadDpiAwarenessContext(), fixes DPI scaling issues with e.g. OpenGL. (#9403)
// 2026-01-28: Inputs: Minor optimization not submitting gamepad input if packet number has not changed (reworked from 2025-09-23 attempt). (#9202, #8556)
// 2025-12-03: Inputs: handle WM_IME_CHAR/WM_IME_COMPOSITION messages to support Unicode inputs on MBCS (non-Unicode) Windows. (#9099, #3653, #5961)
// 2025-10-19: Inputs: Revert previous change to allow for io.ClearInputKeys() on focus-out not losing gamepad state.
@@ -886,6 +887,7 @@ DECLARE_HANDLE(DPI_AWARENESS_CONTEXT);
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 BOOL(WINAPI* PFN_SetProcessDpiAwarenessContext)(DPI_AWARENESS_CONTEXT); // User32.lib + dll, Windows 10 v1703+ (Creators Update)
// Helper function to enable DPI awareness without setting up a manifest
void ImGui_ImplWin32_EnableDpiAwareness()
@@ -893,7 +895,12 @@ void ImGui_ImplWin32_EnableDpiAwareness()
if (_IsWindows10OrGreater())
{
static HINSTANCE user32_dll = ::LoadLibraryA("user32.dll"); // Reference counted per-process
if (PFN_SetThreadDpiAwarenessContext SetThreadDpiAwarenessContextFn = (PFN_SetThreadDpiAwarenessContext)::GetProcAddress(user32_dll, "SetThreadDpiAwarenessContext"))
if (PFN_SetProcessDpiAwarenessContext SetProcessDpiAwarenessContextFn = (PFN_SetProcessDpiAwarenessContext)::GetProcAddress(user32_dll, "SetProcessDpiAwarenessContext")) // Windows 10 v1703+
{
SetProcessDpiAwarenessContextFn(DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE_V2);
return;
}
if (PFN_SetThreadDpiAwarenessContext SetThreadDpiAwarenessContextFn = (PFN_SetThreadDpiAwarenessContext)::GetProcAddress(user32_dll, "SetThreadDpiAwarenessContext")) // Windows 10 v1607+
{
SetThreadDpiAwarenessContextFn(DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE_V2);
return;

5
docs/CHANGELOG.txt
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@@ -52,6 +52,11 @@ Other Changes:
- Demo:
- Extract 'Widgets->Tree Nodes->Selectable Nodes' out of the 'Advanced'
demo for clarity (manual reimplementation of basic selection).
- Backends:
- Win32:
- Uses `SetProcessDpiAwarenessContext()` instead of `SetThreadDpiAwarenessContext()`
when available, fixing OpenGL DPI scaling issues as e.g. NVIDIA drivers tends
to spawn multiple-thread to manage OpenGL. (#9403)
-----------------------------------------------------------------------