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expose a getter for css to imgui scale ratio

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SlowRiot 2026-09-06 15:51:09 +01:00
parent ec5643bda6
commit da9e7b6e5e
2 changed files with 11 additions and 0 deletions
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8
backends/imgui_impl_emscripten.cpp
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@ -4,6 +4,7 @@
//
// CHANGELOG
// (minor and older changes stripped away, please see git history for details)
// 2026-09-06: Emscripten: Added ImGui_ImplEmscripten_GetCssToImGuiScale() helper.
// 2026-09-05: Emscripten: Use the canvas framebuffer dimensions for display sizing and exact per-axis mouse coordinate scaling.
// 2026-09-04: Emscripten: Replaced TargetDevicePixelRatio global with an Init() parameter and runtime setter.
// 2026-09-03: Updated coding style and simplified key translation table setup.
@ -402,6 +403,13 @@ void ImGui_ImplEmscripten_SetTargetDevicePixelRatio(float target_device_pixel_ra
ImGui_ImplEmscripten_UpdateDisplayProperties(ImGui::GetIO(), bd);
}
ImVec2 ImGui_ImplEmscripten_GetCssToImGuiScale()
{
ImGui_ImplEmscripten_Data* bd = ImGui_ImplEmscripten_GetBackendData();
IM_ASSERT(bd != nullptr && "Context or backend not initialized? Did you call ImGui_ImplEmscripten_Init()?");
return bd != nullptr ? bd->CssToImGuiScale : ImVec2(1.0f, 1.0f);
}
void ImGui_ImplEmscripten_Shutdown()
{
ImGui_ImplEmscripten_Data* bd = ImGui_ImplEmscripten_GetBackendData();

3
backends/imgui_impl_emscripten.h
View file

@ -47,6 +47,9 @@ IMGUI_IMPL_API bool ImGui_ImplEmscripten_Init(float target_device_pixel_ratio =
// Change the target device pixel ratio at runtime and update display properties immediately.
IMGUI_IMPL_API void ImGui_ImplEmscripten_SetTargetDevicePixelRatio(float target_device_pixel_ratio);
// Return the scale used to convert browser CSS pixel coordinates to Dear ImGui coordinates. Valid after Init().
IMGUI_IMPL_API ImVec2 ImGui_ImplEmscripten_GetCssToImGuiScale();
// Shut down the Emscripten backend. This unsets all Emscripten input callbacks set by Init.
// Note it'll also unset any Emscripten input callbacks set elsewhere in the program!
// Note also there is no obligation to ever call this, unless you intend to reset the backend (i.e. with ImGui::DestroyContext()).