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Backends: SDL2: added ImGui_ImplSDL2_GetDpiScaleForDisplay(), ImGui_ImplSDL2_GetContentScaleForWindow() helpers.

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ocornut
2025-06-06 15:54:25 +02:00
parent d72e66cdee
commit 9da3e6696a
2 changed files with 25 additions and 0 deletions
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21
backends/imgui_impl_sdl2.cpp
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@@ -21,6 +21,7 @@
// CHANGELOG
// (minor and older changes stripped away, please see git history for details)
// 2025-06-11: Added ImGui_ImplSDL2_GetContentScaleForWindow(SDL_Window* window) and ImGui_ImplSDL2_GetContentScaleForDisplay(int display_index) helper to facilitate making DPI-aware apps.
// 2025-04-09: Don't attempt to call SDL_CaptureMouse() on drivers where we don't call SDL_GetGlobalMouseState(). (#8561)
// 2025-03-21: Fill gamepad inputs and set ImGuiBackendFlags_HasGamepad regardless of ImGuiConfigFlags_NavEnableGamepad being set.
// 2025-03-10: When dealing with OEM keys, use scancodes instead of translated keycodes to choose ImGuiKey values. (#7136, #7201, #7206, #7306, #7670, #7672, #8468)
@@ -702,6 +703,26 @@ static void ImGui_ImplSDL2_UpdateMouseCursor()
}
}
// - 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.
float ImGui_ImplSDL2_GetContentScaleForWindow(SDL_Window* window)
{
return ImGui_ImplSDL2_GetContentScaleForDisplay(SDL_GetWindowDisplayIndex(window));
}
float ImGui_ImplSDL2_GetContentScaleForDisplay(int display_index)
{
#if SDL_HAS_PER_MONITOR_DPI
#ifndef __APPLE__
float dpi = 0.0f;
if (SDL_GetDisplayDPI(display_index, &dpi, nullptr, nullptr) == 0)
return dpi / 96.0f;
#endif
#endif
return 1.0f;
}
static void ImGui_ImplSDL2_CloseGamepads()
{
ImGui_ImplSDL2_Data* bd = ImGui_ImplSDL2_GetBackendData();

4
backends/imgui_impl_sdl2.h
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@@ -38,6 +38,10 @@ IMGUI_IMPL_API void ImGui_ImplSDL2_Shutdown();
IMGUI_IMPL_API void ImGui_ImplSDL2_NewFrame();
IMGUI_IMPL_API bool ImGui_ImplSDL2_ProcessEvent(const SDL_Event* event);
// DPI-related helpers (optional)
IMGUI_IMPL_API float ImGui_ImplSDL2_GetContentScaleForWindow(SDL_Window* window);
IMGUI_IMPL_API float ImGui_ImplSDL2_GetContentScaleForDisplay(int display_index);
// Gamepad selection automatically starts in AutoFirst mode, picking first available SDL_Gamepad. You may override this.
// When using manual mode, caller is responsible for opening/closing gamepad.
enum ImGui_ImplSDL2_GamepadMode { ImGui_ImplSDL2_GamepadMode_AutoFirst, ImGui_ImplSDL2_GamepadMode_AutoAll, ImGui_ImplSDL2_GamepadMode_Manual };