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main: Use passthrough scaling for non-windows OSes
They should be better than windows when handling fractional scaling ratios.
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@ -4401,6 +4401,10 @@ void GMainWindow::changeEvent(QEvent* event) {
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#endif
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static void SetHighDPIAttributes() {
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#ifdef _WIN32
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// For Windows, we want to avoid scaling artifacts on fractional scaling ratios.
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// This is done by setting the optimal scaling policy for the primary screen.
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// Create a temporary QApplication.
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int temp_argc = 0;
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char** temp_argv = nullptr;
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@ -4428,9 +4432,6 @@ static void SetHighDPIAttributes() {
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// Get the lower of the 2 ratios and truncate, this is the maximum integer scale.
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const float max_ratio = std::trunc(std::min(width_ratio, height_ratio));
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QApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
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QApplication::setAttribute(Qt::AA_UseHighDpiPixmaps);
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if (max_ratio > real_ratio) {
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QApplication::setHighDpiScaleFactorRoundingPolicy(
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Qt::HighDpiScaleFactorRoundingPolicy::Round);
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@ -4438,6 +4439,14 @@ static void SetHighDPIAttributes() {
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QApplication::setHighDpiScaleFactorRoundingPolicy(
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Qt::HighDpiScaleFactorRoundingPolicy::Floor);
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}
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#else
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// Other OSes should be better than Windows at fractional scaling.
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QApplication::setHighDpiScaleFactorRoundingPolicy(
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Qt::HighDpiScaleFactorRoundingPolicy::PassThrough);
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#endif
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QApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
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QApplication::setAttribute(Qt::AA_UseHighDpiPixmaps);
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}
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int main(int argc, char* argv[]) {
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