Scale absolute mouse coordinates up to the full display dimensions.

The values written into XenStore for the vkbd device width/height are
the full display dimensions.  The vkbd frontend thus expects absolute
reports to range over those values, not the actual buffer dimensions.

Fixes absolute coordinates for undersized guest framebuffers.

1 files changed, 10 insertions, 0 deletions

diff --git a/src/input.h b/src/input.h
index 7785274..eb02850 100644
--- a/src/input.h
+++ b/src/input.h
@@ -22,6 +22,16 @@ static inline int clamp_value(int val, int max)
 	return val;
 }
 
+static inline int scale_value(int val, int max, int scale)
+{
+    if (val <= 0)
+	return 0;
+    else if (val >= max)
+	return scale;
+    else
+	return (val * scale) / max;
+}
+
 int
 input_initialize(int argc, char *argv[]);