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correct scaling independent of device pixel ratio

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This commit is contained in:
SlowRiot 2026-03-31 21:31:11 +01:00
parent 784ad4e0d2
commit 88fe8d401f
1 changed files with 21 additions and 9 deletions
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30
backends/imgui_impl_emscripten.cpp
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@ -100,11 +100,13 @@ namespace {
struct ImGui_ImplEmscripten_Data
{
float DevicePixelRatio;
emscripten_browser_cursor_internal::cursor CurrentCursor;
char* CursorToRestore;
ImGui_ImplEmscripten_Data()
: CurrentCursor{emscripten_browser_cursor_internal::cursor::invalid}
: DevicePixelRatio{1.0f}
, CurrentCursor{emscripten_browser_cursor_internal::cursor::invalid}
, CursorToRestore{nullptr}
{
}
@ -130,17 +132,21 @@ void ImGui_ImplEmscripten_Init()
io.BackendFlags |= ImGuiBackendFlags_HasMouseCursors;
// set up initial display size values
io.DisplaySize.x = static_cast<float>(EM_ASM_INT(return window.innerWidth;));
io.DisplaySize.y = static_cast<float>(EM_ASM_INT(return window.innerHeight;));
bd->DevicePixelRatio = static_cast<float>(emscripten_get_device_pixel_ratio());
io.DisplaySize.x = static_cast<float>(EM_ASM_INT(return window.innerWidth;)) * bd->DevicePixelRatio;
io.DisplaySize.y = static_cast<float>(EM_ASM_INT(return window.innerHeight;)) * bd->DevicePixelRatio;
io.DisplayFramebufferScale = ImVec2(1.0f, 1.0f);
emscripten_set_mousemove_callback(
EMSCRIPTEN_EVENT_TARGET_WINDOW, // target
nullptr, // userData
false, // useCapture
[](int /*event_type*/, EmscriptenMouseEvent const* mouse_event, void* /*data*/) { // callback, event_type == EMSCRIPTEN_EVENT_MOUSEMOVE
ImGui_ImplEmscripten_Data* bd{ImGui_ImplEmscripten_GetBackendData()};
float const device_pixel_ratio{bd ? bd->DevicePixelRatio : 1.0f};
ImGui::GetIO().AddMousePosEvent(
static_cast<float>(mouse_event->clientX),
static_cast<float>(mouse_event->clientY)
static_cast<float>(mouse_event->clientX) * device_pixel_ratio,
static_cast<float>(mouse_event->clientY) * device_pixel_ratio
);
return true; // the event was consumed
}
@ -168,9 +174,11 @@ void ImGui_ImplEmscripten_Init()
nullptr, // userData
false, // useCapture
[](int /*event_type*/, EmscriptenMouseEvent const* mouse_event, void* /*data*/) { // callback, event_type == EMSCRIPTEN_EVENT_MOUSEENTER
ImGui_ImplEmscripten_Data* bd{ImGui_ImplEmscripten_GetBackendData()};
float const device_pixel_ratio{bd ? bd->DevicePixelRatio : 1.0f};
ImGui::GetIO().AddMousePosEvent(
static_cast<float>(mouse_event->clientX),
static_cast<float>(mouse_event->clientY)
static_cast<float>(mouse_event->clientX) * device_pixel_ratio,
static_cast<float>(mouse_event->clientY) * device_pixel_ratio
);
return true; // the event was consumed
}
@ -298,8 +306,12 @@ void ImGui_ImplEmscripten_Init()
false, // useCapture
[](int /*event_type*/, EmscriptenUiEvent const* event, void* /*data*/) { // event_type == EMSCRIPTEN_EVENT_RESIZE
ImGuiIO& io{ImGui::GetIO()};
io.DisplaySize.x = static_cast<float>(event->windowInnerWidth);
io.DisplaySize.y = static_cast<float>(event->windowInnerHeight);
ImGui_ImplEmscripten_Data* bd{ImGui_ImplEmscripten_GetBackendData()};
float const device_pixel_ratio{static_cast<float>(emscripten_get_device_pixel_ratio())};
if (bd != nullptr) bd->DevicePixelRatio = device_pixel_ratio;
io.DisplaySize.x = static_cast<float>(event->windowInnerWidth) * device_pixel_ratio;
io.DisplaySize.y = static_cast<float>(event->windowInnerHeight) * device_pixel_ratio;
io.DisplayFramebufferScale = ImVec2(1.0f, 1.0f);
return true; // the event was consumed
}
);