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RenderWidget: Fix mouse position for imgui on hidpi screens

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stenzek committed Jan 25, 2019
1 parent 6962d5b commit 3d8145af65afd0445ae9416906cffad0750007de
Showing with 7 additions and 2 deletions.
  1. +7 −2 Source/Core/DolphinQt/RenderWidget.cpp
@@ -284,8 +284,13 @@ void RenderWidget::PassEventToImGui(const QEvent* event)
case QEvent::MouseMove:
{
auto lock = g_renderer->GetImGuiLock();
ImGui::GetIO().MousePos.x = static_cast<const QMouseEvent*>(event)->x();
ImGui::GetIO().MousePos.y = static_cast<const QMouseEvent*>(event)->y();

// Qt multiplies all coordinates by the scaling factor in highdpi mode, giving us "scaled" mouse
// coordinates (as if the screen was standard dpi). We need to update the mouse position in
// native coordinates, as the UI (and game) is rendered at native resolution.
const float scale = devicePixelRatio();
ImGui::GetIO().MousePos.x = static_cast<const QMouseEvent*>(event)->x() * scale;
ImGui::GetIO().MousePos.y = static_cast<const QMouseEvent*>(event)->y() * scale;
}
break;

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