From 9028fd53bd68898ce00efb8d3186947d8a52c798 Mon Sep 17 00:00:00 2001
From: Michael Lotz <mmlr@mlotz.ch>
Date: Wed, 8 Jun 2011 00:26:04 +0000
Subject: [PATCH] Add HIDReportItem::ScaledRangeData() that scales the data
 into a pariticular range.

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@42033 a95241bf-73f2-0310-859d-f6bbb57e9c96
---
 .../kernel/drivers/input/usb_hid/HIDReportItem.cpp | 14 ++++++++++++++
 .../kernel/drivers/input/usb_hid/HIDReportItem.h   |  1 +
 2 files changed, 15 insertions(+)

diff --git a/src/add-ons/kernel/drivers/input/usb_hid/HIDReportItem.cpp b/src/add-ons/kernel/drivers/input/usb_hid/HIDReportItem.cpp
index 5f937a6c11..d83d267bde 100644
--- a/src/add-ons/kernel/drivers/input/usb_hid/HIDReportItem.cpp
+++ b/src/add-ons/kernel/drivers/input/usb_hid/HIDReportItem.cpp
@@ -146,6 +146,20 @@ HIDReportItem::ScaledData(uint8 scaleToBits, bool toBeSigned)
 }
 
 
+uint32
+HIDReportItem::ScaledRangeData(uint32 minimum, uint32 maximum)
+{
+	uint64 zeroBasedData;
+	if (Signed())
+		zeroBasedData = (int32)fData - (int32)fMinimum;
+	else
+		zeroBasedData = fData - fMinimum;
+
+	return zeroBasedData * (maximum - minimum + 1) / (fMaximum - fMinimum + 1)
+		+ minimum;
+}
+
+
 float
 HIDReportItem::ScaledFloatData()
 {
diff --git a/src/add-ons/kernel/drivers/input/usb_hid/HIDReportItem.h b/src/add-ons/kernel/drivers/input/usb_hid/HIDReportItem.h
index 23238b5bec..b9f4e1f0c0 100644
--- a/src/add-ons/kernel/drivers/input/usb_hid/HIDReportItem.h
+++ b/src/add-ons/kernel/drivers/input/usb_hid/HIDReportItem.h
@@ -37,6 +37,7 @@ public:
 		uint32					Data() { return fData; };
 
 		uint32					ScaledData(uint8 scaleToBits, bool toBeSigned);
+		uint32					ScaledRangeData(uint32 minimum, uint32 maximum);
 		float					ScaledFloatData();
 
 		bool					Valid() { return fValid; };