inital commit

Overlord-Client/cmd/agent/capture/roi_windows.go

@@ -0,0 +1,51 @@
+//go:build windows
+
+package capture
+
+import (
+	"image"
+	"unsafe"
+)
+
+var (
+	procGetForegroundWindowROI = user32.NewProc("GetForegroundWindow")
+	procGetWindowRectROI       = user32.NewProc("GetWindowRect")
+)
+
+type winRect struct {
+	left   int32
+	top    int32
+	right  int32
+	bottom int32
+}
+
+func cursorROI() (image.Rectangle, bool) {
+	x, y, visible := getCursorPosition()
+	if !visible {
+		return image.Rectangle{}, false
+	}
+	const cursorBox = 48
+	half := cursorBox / 2
+	r := image.Rect(int(x)-half, int(y)-half, int(x)+half, int(y)+half)
+	if r.Dx() <= 0 || r.Dy() <= 0 {
+		return image.Rectangle{}, false
+	}
+	return r, true
+}
+
+func focusWindowROI() (image.Rectangle, bool) {
+	hwnd, _, _ := procGetForegroundWindowROI.Call()
+	if hwnd == 0 {
+		return image.Rectangle{}, false
+	}
+	var wr winRect
+	ret, _, _ := procGetWindowRectROI.Call(hwnd, uintptr(unsafe.Pointer(&wr)))
+	if ret == 0 {
+		return image.Rectangle{}, false
+	}
+	r := image.Rect(int(wr.left), int(wr.top), int(wr.right), int(wr.bottom))
+	if r.Dx() <= 0 || r.Dy() <= 0 {
+		return image.Rectangle{}, false
+	}
+	return r, true
+}