From 5eb72e948901012a4f6c2fe8a97b9d01cfa87fdd Mon Sep 17 00:00:00 2001 From: Morph <39850852+Morph1984@users.noreply.github.com> Date: Thu, 9 Feb 2023 19:19:43 -0500 Subject: [PATCH] main: Enable High DPI fixes for Qt >= 5.14 (#6262) Fixes https://github.com/citra-emu/citra/issues/4175 Fixes https://github.com/citra-emu/citra/issues/4977 --- src/citra_qt/main.cpp | 51 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 51 insertions(+) diff --git a/src/citra_qt/main.cpp b/src/citra_qt/main.cpp index f9c67b027..9c2d5c377 100644 --- a/src/citra_qt/main.cpp +++ b/src/citra_qt/main.cpp @@ -2663,6 +2663,55 @@ void GMainWindow::SetDiscordEnabled([[maybe_unused]] bool state) { #undef main #endif +static void SetHighDPIAttributes() { +#ifdef _WIN32 + // For Windows, we want to avoid scaling artifacts on fractional scaling ratios. + // This is done by setting the optimal scaling policy for the primary screen. + + // Create a temporary QApplication. + int temp_argc = 0; + char** temp_argv = nullptr; + QApplication temp{temp_argc, temp_argv}; + + // Get the current screen geometry. + const QScreen* primary_screen = QGuiApplication::primaryScreen(); + if (primary_screen == nullptr) { + return; + } + + const QRect screen_rect = primary_screen->geometry(); + const int real_width = screen_rect.width(); + const int real_height = screen_rect.height(); + const float real_ratio = primary_screen->logicalDotsPerInch() / 96.0f; + + // Recommended minimum width and height for proper window fit. + // Any screen with a lower resolution than this will still have a scale of 1. + constexpr float minimum_width = 1350.0f; + constexpr float minimum_height = 900.0f; + + const float width_ratio = std::max(1.0f, real_width / minimum_width); + const float height_ratio = std::max(1.0f, real_height / minimum_height); + + // Get the lower of the 2 ratios and truncate, this is the maximum integer scale. + const float max_ratio = std::trunc(std::min(width_ratio, height_ratio)); + + if (max_ratio > real_ratio) { + QApplication::setHighDpiScaleFactorRoundingPolicy( + Qt::HighDpiScaleFactorRoundingPolicy::Round); + } else { + QApplication::setHighDpiScaleFactorRoundingPolicy( + Qt::HighDpiScaleFactorRoundingPolicy::Floor); + } +#else + // Other OSes should be better than Windows at fractional scaling. + QApplication::setHighDpiScaleFactorRoundingPolicy( + Qt::HighDpiScaleFactorRoundingPolicy::PassThrough); +#endif + + QApplication::setAttribute(Qt::AA_EnableHighDpiScaling); + QApplication::setAttribute(Qt::AA_UseHighDpiPixmaps); +} + int main(int argc, char* argv[]) { Common::DetachedTasks detached_tasks; MicroProfileOnThreadCreate("Frontend"); @@ -2680,6 +2729,8 @@ int main(int argc, char* argv[]) { format.setSwapBehavior(QSurfaceFormat::DefaultSwapBehavior); QSurfaceFormat::setDefaultFormat(format); + SetHighDPIAttributes(); + #ifdef __APPLE__ std::string bin_path = FileUtil::GetBundleDirectory() + DIR_SEP + ".."; chdir(bin_path.c_str());