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Commit 60b5776c authored by Jeff Brown's avatar Jeff Brown
Browse files

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
parent af66eda6

include/ui/InputReader.h

+10 −0
Original line number Diff line number Diff line
@@ -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,

libs/ui/InputReader.cpp

+33 −5
Original line number Diff line number Diff line
@@ -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: