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Add support for calibrating touch position. 

Useful for tweaking touch screen alignment without having to modify the
kernel device driver x/y axis bounds.

Change-Id: I6ca43d3c138548f9dfb76aa33150a0c853698fb6
This commit is contained in:
Jeff Brown 2010-10-18 13:32:20 -07:00
parent af66eda6e7
commit 60b5776c87
2 changed files with 43 additions and 5 deletions
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10
include/ui/InputReader.h
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@ -584,6 +584,16 @@ protected:
// Immutable calibration parameters in parsed form.
struct Calibration {
// Position
bool haveXOrigin;
int32_t xOrigin;
bool haveYOrigin;
int32_t yOrigin;
bool haveXScale;
float xScale;
bool haveYScale;
float yScale;
// Touch Size
enum TouchSizeCalibration {
TOUCH_SIZE_CALIBRATION_DEFAULT,

38
libs/ui/InputReader.cpp
View File

@ -1344,7 +1344,7 @@ void TouchInputMapper::dump(String8& dump) {
dumpRawAxes(dump);
dumpCalibration(dump);
dumpSurfaceLocked(dump);
dump.appendFormat(INDENT3 "Translation and Scaling Factors:");
dump.appendFormat(INDENT3 "Translation and Scaling Factors:\n");
dump.appendFormat(INDENT4 "XOrigin: %d\n", mLocked.xOrigin);
dump.appendFormat(INDENT4 "YOrigin: %d\n", mLocked.yOrigin);
dump.appendFormat(INDENT4 "XScale: %0.3f\n", mLocked.xScale);
@ -1481,10 +1481,18 @@ bool TouchInputMapper::configureSurfaceLocked() {
// Configure X and Y factors.
if (mRawAxes.x.valid && mRawAxes.y.valid) {
mLocked.xOrigin = mRawAxes.x.minValue;
mLocked.yOrigin = mRawAxes.y.minValue;
mLocked.xScale = float(width) / mRawAxes.x.getRange();
mLocked.yScale = float(height) / mRawAxes.y.getRange();
mLocked.xOrigin = mCalibration.haveXOrigin
? mCalibration.xOrigin
: mRawAxes.x.minValue;
mLocked.yOrigin = mCalibration.haveYOrigin
? mCalibration.yOrigin
: mRawAxes.y.minValue;
mLocked.xScale = mCalibration.haveXScale
? mCalibration.xScale
: float(width) / mRawAxes.x.getRange();
mLocked.yScale = mCalibration.haveYScale
? mCalibration.yScale
: float(height) / mRawAxes.y.getRange();
mLocked.xPrecision = 1.0f / mLocked.xScale;
mLocked.yPrecision = 1.0f / mLocked.yScale;
@ -1750,6 +1758,12 @@ void TouchInputMapper::parseCalibration() {
const InputDeviceCalibration& in = getDevice()->getCalibration();
Calibration& out = mCalibration;
// Position
out.haveXOrigin = in.tryGetProperty(String8("touch.position.xOrigin"), out.xOrigin);
out.haveYOrigin = in.tryGetProperty(String8("touch.position.yOrigin"), out.yOrigin);
out.haveXScale = in.tryGetProperty(String8("touch.position.xScale"), out.xScale);
out.haveYScale = in.tryGetProperty(String8("touch.position.yScale"), out.yScale);
// Touch Size
out.touchSizeCalibration = Calibration::TOUCH_SIZE_CALIBRATION_DEFAULT;
String8 touchSizeCalibrationString;
@ -1959,6 +1973,20 @@ void TouchInputMapper::resolveCalibration() {
void TouchInputMapper::dumpCalibration(String8& dump) {
dump.append(INDENT3 "Calibration:\n");
// Position
if (mCalibration.haveXOrigin) {
dump.appendFormat(INDENT4 "touch.position.xOrigin: %d\n", mCalibration.xOrigin);
}
if (mCalibration.haveYOrigin) {
dump.appendFormat(INDENT4 "touch.position.yOrigin: %d\n", mCalibration.yOrigin);
}
if (mCalibration.haveXScale) {
dump.appendFormat(INDENT4 "touch.position.xScale: %0.3f\n", mCalibration.xScale);
}
if (mCalibration.haveYScale) {
dump.appendFormat(INDENT4 "touch.position.yScale: %0.3f\n", mCalibration.yScale);
}
// Touch Size
switch (mCalibration.touchSizeCalibration) {
case Calibration::TOUCH_SIZE_CALIBRATION_NONE: