Add Surface::PixelDivisions which detects 'retina' displays that use

multiple display pixels per logical pixel.
Likely will only return >1 for Apple displays.
Can be used for finer placement of elements.

1 files changed, 6 insertions, 0 deletions

diff --git a/gtk/PlatGTK.cxx b/gtk/PlatGTK.cxx
index 19b25294b..33a0b8917 100755
--- a/gtk/PlatGTK.cxx
+++ b/gtk/PlatGTK.cxx
@@ -155,6 +155,7 @@ public:
 	bool Initialised() override;
 	void PenColour(ColourDesired fore) override;
 	int LogPixelsY() override;
+	int PixelDivisions() override;
 	int DeviceHeightFont(int points) override;
 	void MoveTo(int x_, int y_) override;
 	void LineTo(int x_, int y_) override;
@@ -395,6 +396,11 @@ int SurfaceImpl::LogPixelsY() {
 	return 72;
 }
 
+int SurfaceImpl::PixelDivisions() {
+	// GTK uses device pixels.
+	return 1;
+}
+
 int SurfaceImpl::DeviceHeightFont(int points) {
 	const int logPix = LogPixelsY();
 	return (points * logPix + logPix / 2) / 72;