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Backends: GLFW: added a Win32-specific implementation of ImGui_ImplGlfw_GetContentScaleXXXX functions for legacy GLFW 3.2. (#9003)

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Since we ship GLFW 3.2 binaries for Windows this makes our examples a little better behaving by default.
Ideally we'd use ImGui_ImplWin32_GetDpiScaleForHwnd() and ImGui_ImplWin32_GetDpiScaleForMonitor() but they are too much code to copy.
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ocornut
2026-04-21 17:24:41 +02:00
parent d7b40ab9a9
commit a1e05521e9
2 changed files with 13 additions and 0 deletions
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11
backends/imgui_impl_glfw.cpp
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@@ -29,6 +29,7 @@
// CHANGELOG
// (minor and older changes stripped away, please see git history for details)
// 2026-04-21: Added a Win32-specific implementation of ImGui_ImplGlfw_GetContentScaleXXXX functions for legacy GLFW 3.2.
// 2026-03-25: Mouse cursor is properly restored if changed by user app/code while using glfwSetInputMode(..., GLFW_CURSOR_DISABLED) or ImGuiConfigFlags_NoMouseCursorChange. Amend change from 2025-12-10.
// 2026-02-10: Try to set IMGUI_IMPL_GLFW_DISABLE_X11 / IMGUI_IMPL_GLFW_DISABLE_WAYLAND automatically if corresponding headers are not accessible. (#9225)
// 2025-12-12: Added IMGUI_IMPL_GLFW_DISABLE_X11 / IMGUI_IMPL_GLFW_DISABLE_WAYLAND to forcefully disable either.
@@ -948,6 +949,16 @@ static void ImGui_ImplGlfw_UpdateGamepads()
#undef MAP_ANALOG
}
// For GFLW 3.2 + Windows: include a simplified non-monitor aware version of ImGui_ImplWin32_GetDpiScaleForMonitor().
// This is merely a band-aid to make using GLFW 3.2 a little bit nicer, but prefer to use GLFW 3.3+ or the full correct functions from the Win32 backend.
#if !GLFW_HAS_PER_MONITOR_DPI && defined(_WIN32) && !defined(NOGDI)
float ImGui_ImplWin32_GetLegacyDpiScale() { const HDC dc = ::GetDC(nullptr); UINT xdpi = ::GetDeviceCaps(dc, LOGPIXELSX); ::ReleaseDC(nullptr, dc); return xdpi / 96.0f; }
void glfwGetWindowContentScale(GLFWwindow*, float* x_scale, float* y_scale) { *x_scale = *y_scale = ImGui_ImplWin32_GetLegacyDpiScale(); }
void glfwGetMonitorContentScale(GLFWmonitor*, float* x_scale, float* y_scale) { *x_scale = *y_scale = ImGui_ImplWin32_GetLegacyDpiScale(); }
#undef GLFW_HAS_PER_MONITOR_DPI
#define GLFW_HAS_PER_MONITOR_DPI 1
#endif
// - On Windows the process needs to be marked DPI-aware!! SDL2 doesn't do it by default. You can call ::SetProcessDPIAware() or call ImGui_ImplWin32_EnableDpiAwareness() from Win32 backend.
// - Apple platforms use FramebufferScale so we always return 1.0f.
// - Some accessibility applications are declaring virtual monitors with a DPI of 0.0f, see #7902. We preserve this value for caller to handle.

2
docs/CHANGELOG.txt
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@@ -103,6 +103,8 @@ Other Changes:
- Minor optimization: reduce redudant label scanning in common widgets.
- Added missing Test Engine hooks for PlotXXX(), VSliderXXX(), TableHeader().
- Backends:
- GLFW: added a Win32-specific implementation of `ImGui_ImplGlfw_GetContentScaleXXXX`
functions for legacy GLFW 3.2. (#9003)
- Metal: avoid redundant vertex buffer bind in `SetupRenderState()`, which leads
to validation issue. (#9343) [@Hunam6]
- Metal: use a dedicated `bufferCacheLock` to avoid crashing when `bufferCache` is