42 lines
1.3 KiB
Go
42 lines
1.3 KiB
Go
//go:build darwin
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package display
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/*
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#cgo LDFLAGS: -framework CoreGraphics -framework Foundation
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#include <CoreGraphics/CoreGraphics.h>
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// readPrimaryDisplay fills the four out-params with:
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// - cssW / cssH : logical (point) dimensions of the main display
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// - pxW / pxH : physical (device-pixel) dimensions
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// Using CGDisplayBounds for points and CGDisplayPixelsWide/High for pixels
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// is the canonical way to derive the backing scale on macOS without
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// bringing AppKit into the build (we do not want to link Cocoa here).
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static void readPrimaryDisplay(int* cssW, int* cssH, int* pxW, int* pxH) {
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CGDirectDisplayID id = CGMainDisplayID();
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CGRect bounds = CGDisplayBounds(id);
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*cssW = (int)bounds.size.width;
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*cssH = (int)bounds.size.height;
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*pxW = (int)CGDisplayPixelsWide(id);
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*pxH = (int)CGDisplayPixelsHigh(id);
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}
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*/
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import "C"
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// Primary returns the geometry of the main display. The CGo call has no
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// failure path — the OS always reports a main display whenever there is at
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// least one attached, which is implied for any GUI process.
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func Primary() Info {
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var cssW, cssH, pxW, pxH C.int
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C.readPrimaryDisplay(&cssW, &cssH, &pxW, &pxH)
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scale := 1.0
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if cssW > 0 {
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scale = float64(pxW) / float64(cssW)
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}
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return Info{
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CSSWidth: int(cssW),
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CSSHeight: int(cssH),
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Scale: scale,
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}
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}
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