The Tor Browser: widget/gonk/libui/Input.cpp@ac0c01689b40 (annotated)

widget/gonk/libui/Input.cpp@ac0c01689b40 (annotated)

widget/gonk/libui/Input.cpp

Thu, 15 Jan 2015 15:59:08 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 15 Jan 2015 15:59:08 +0100
branch: TOR_BUG_9701
changeset 10: ac0c01689b40
permissions: -rw-r--r--

Implement a real Private Browsing Mode condition by changing the API/ABI;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.

 /*
  * Copyright (C) 2010 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
 #define LOG_TAG "Input"
 //#define LOG_NDEBUG 0
 #include "cutils_log.h"
 #include <math.h>
 #include <limits.h>
 #include "Input.h"
 #ifdef HAVE_ANDROID_OS
 #include <binder/Parcel.h>
 #include "SkPoint.h"
 #include "SkMatrix.h"
 #include "SkScalar.h"
 #endif
 namespace android {
 // --- InputEvent ---
 void InputEvent::initialize(int32_t deviceId, int32_t source) {
     mDeviceId = deviceId;
     mSource = source;
 }
 void InputEvent::initialize(const InputEvent& from) {
     mDeviceId = from.mDeviceId;
     mSource = from.mSource;
 }
 // --- KeyEvent ---
 bool KeyEvent::hasDefaultAction(int32_t keyCode) {
     switch (keyCode) {
         case AKEYCODE_HOME:
         case AKEYCODE_BACK:
         case AKEYCODE_CALL:
         case AKEYCODE_ENDCALL:
         case AKEYCODE_VOLUME_UP:
         case AKEYCODE_VOLUME_DOWN:
         case AKEYCODE_VOLUME_MUTE:
         case AKEYCODE_POWER:
         case AKEYCODE_CAMERA:
         case AKEYCODE_HEADSETHOOK:
         case AKEYCODE_MENU:
         case AKEYCODE_NOTIFICATION:
         case AKEYCODE_FOCUS:
         case AKEYCODE_SEARCH:
         case AKEYCODE_MEDIA_PLAY:
         case AKEYCODE_MEDIA_PAUSE:
         case AKEYCODE_MEDIA_PLAY_PAUSE:
         case AKEYCODE_MEDIA_STOP:
         case AKEYCODE_MEDIA_NEXT:
         case AKEYCODE_MEDIA_PREVIOUS:
         case AKEYCODE_MEDIA_REWIND:
         case AKEYCODE_MEDIA_RECORD:
         case AKEYCODE_MEDIA_FAST_FORWARD:
         case AKEYCODE_MUTE:
         case AKEYCODE_BRIGHTNESS_DOWN:
         case AKEYCODE_BRIGHTNESS_UP:
             return true;
     }
     return false;
 }
 bool KeyEvent::hasDefaultAction() const {
     return hasDefaultAction(getKeyCode());
 }
 bool KeyEvent::isSystemKey(int32_t keyCode) {
     switch (keyCode) {
         case AKEYCODE_MENU:
         case AKEYCODE_SOFT_RIGHT:
         case AKEYCODE_HOME:
         case AKEYCODE_BACK:
         case AKEYCODE_CALL:
         case AKEYCODE_ENDCALL:
         case AKEYCODE_VOLUME_UP:
         case AKEYCODE_VOLUME_DOWN:
         case AKEYCODE_VOLUME_MUTE:
         case AKEYCODE_MUTE:
         case AKEYCODE_POWER:
         case AKEYCODE_HEADSETHOOK:
         case AKEYCODE_MEDIA_PLAY:
         case AKEYCODE_MEDIA_PAUSE:
         case AKEYCODE_MEDIA_PLAY_PAUSE:
         case AKEYCODE_MEDIA_STOP:
         case AKEYCODE_MEDIA_NEXT:
         case AKEYCODE_MEDIA_PREVIOUS:
         case AKEYCODE_MEDIA_REWIND:
         case AKEYCODE_MEDIA_RECORD:
         case AKEYCODE_MEDIA_FAST_FORWARD:
         case AKEYCODE_CAMERA:
         case AKEYCODE_FOCUS:
         case AKEYCODE_SEARCH:
         case AKEYCODE_BRIGHTNESS_DOWN:
         case AKEYCODE_BRIGHTNESS_UP:
             return true;
     }
     return false;
 }
 bool KeyEvent::isSystemKey() const {
     return isSystemKey(getKeyCode());
 }
 void KeyEvent::initialize(
         int32_t deviceId,
         int32_t source,
         int32_t action,
         int32_t flags,
         int32_t keyCode,
         int32_t scanCode,
         int32_t metaState,
         int32_t repeatCount,
         nsecs_t downTime,
         nsecs_t eventTime) {
     InputEvent::initialize(deviceId, source);
     mAction = action;
     mFlags = flags;
     mKeyCode = keyCode;
     mScanCode = scanCode;
     mMetaState = metaState;
     mRepeatCount = repeatCount;
     mDownTime = downTime;
     mEventTime = eventTime;
 }
 void KeyEvent::initialize(const KeyEvent& from) {
     InputEvent::initialize(from);
     mAction = from.mAction;
     mFlags = from.mFlags;
     mKeyCode = from.mKeyCode;
     mScanCode = from.mScanCode;
     mMetaState = from.mMetaState;
     mRepeatCount = from.mRepeatCount;
     mDownTime = from.mDownTime;
     mEventTime = from.mEventTime;
 }
 // --- PointerCoords ---
 float PointerCoords::getAxisValue(int32_t axis) const {
     if (axis < 0 || axis > 63) {
         return 0;
     }
     uint64_t axisBit = 1LL << axis;
     if (!(bits & axisBit)) {
         return 0;
     }
     uint32_t index = __builtin_popcountll(bits & (axisBit - 1LL));
     return values[index];
 }
 status_t PointerCoords::setAxisValue(int32_t axis, float value) {
     if (axis < 0 || axis > 63) {
         return NAME_NOT_FOUND;
     }
     uint64_t axisBit = 1LL << axis;
     uint32_t index = __builtin_popcountll(bits & (axisBit - 1LL));
     if (!(bits & axisBit)) {
         if (value == 0) {
             return OK; // axes with value 0 do not need to be stored
         }
         uint32_t count = __builtin_popcountll(bits);
         if (count >= MAX_AXES) {
             tooManyAxes(axis);
             return NO_MEMORY;
         }
         bits |= axisBit;
         for (uint32_t i = count; i > index; i--) {
             values[i] = values[i - 1];
         }
     }
     values[index] = value;
     return OK;
 }
 static inline void scaleAxisValue(PointerCoords& c, int axis, float scaleFactor) {
     float value = c.getAxisValue(axis);
     if (value != 0) {
         c.setAxisValue(axis, value * scaleFactor);
     }
 }
 void PointerCoords::scale(float scaleFactor) {
     // No need to scale pressure or size since they are normalized.
     // No need to scale orientation since it is meaningless to do so.
     scaleAxisValue(*this, AMOTION_EVENT_AXIS_X, scaleFactor);
     scaleAxisValue(*this, AMOTION_EVENT_AXIS_Y, scaleFactor);
     scaleAxisValue(*this, AMOTION_EVENT_AXIS_TOUCH_MAJOR, scaleFactor);
     scaleAxisValue(*this, AMOTION_EVENT_AXIS_TOUCH_MINOR, scaleFactor);
     scaleAxisValue(*this, AMOTION_EVENT_AXIS_TOOL_MAJOR, scaleFactor);
     scaleAxisValue(*this, AMOTION_EVENT_AXIS_TOOL_MINOR, scaleFactor);
 }
 #ifdef HAVE_ANDROID_OS
 status_t PointerCoords::readFromParcel(Parcel* parcel) {
     bits = parcel->readInt64();
     uint32_t count = __builtin_popcountll(bits);
     if (count > MAX_AXES) {
         return BAD_VALUE;
     }
     for (uint32_t i = 0; i < count; i++) {
         values[i] = parcel->readFloat();
     }
     return OK;
 }
 status_t PointerCoords::writeToParcel(Parcel* parcel) const {
     parcel->writeInt64(bits);
     uint32_t count = __builtin_popcountll(bits);
     for (uint32_t i = 0; i < count; i++) {
         parcel->writeFloat(values[i]);
     }
     return OK;
 }
 #endif
 void PointerCoords::tooManyAxes(int axis) {
     ALOGW("Could not set value for axis %d because the PointerCoords structure is full and "
             "cannot contain more than %d axis values.", axis, int(MAX_AXES));
 }
 bool PointerCoords::operator==(const PointerCoords& other) const {
     if (bits != other.bits) {
         return false;
     }
     uint32_t count = __builtin_popcountll(bits);
     for (uint32_t i = 0; i < count; i++) {
         if (values[i] != other.values[i]) {
             return false;
         }
     }
     return true;
 }
 void PointerCoords::copyFrom(const PointerCoords& other) {
     bits = other.bits;
     uint32_t count = __builtin_popcountll(bits);
     for (uint32_t i = 0; i < count; i++) {
         values[i] = other.values[i];
     }
 }
 // --- PointerProperties ---
 bool PointerProperties::operator==(const PointerProperties& other) const {
     return id == other.id
             && toolType == other.toolType;
 }
 void PointerProperties::copyFrom(const PointerProperties& other) {
     id = other.id;
     toolType = other.toolType;
 }
 // --- MotionEvent ---
 void MotionEvent::initialize(
         int32_t deviceId,
         int32_t source,
         int32_t action,
         int32_t flags,
         int32_t edgeFlags,
         int32_t metaState,
         int32_t buttonState,
         float xOffset,
         float yOffset,
         float xPrecision,
         float yPrecision,
         nsecs_t downTime,
         nsecs_t eventTime,
         size_t pointerCount,
         const PointerProperties* pointerProperties,
         const PointerCoords* pointerCoords) {
     InputEvent::initialize(deviceId, source);
     mAction = action;
     mFlags = flags;
     mEdgeFlags = edgeFlags;
     mMetaState = metaState;
     mButtonState = buttonState;
     mXOffset = xOffset;
     mYOffset = yOffset;
     mXPrecision = xPrecision;
     mYPrecision = yPrecision;
     mDownTime = downTime;
     mPointerProperties.clear();
     mPointerProperties.appendArray(pointerProperties, pointerCount);
     mSampleEventTimes.clear();
     mSamplePointerCoords.clear();
     addSample(eventTime, pointerCoords);
 }
 void MotionEvent::copyFrom(const MotionEvent* other, bool keepHistory) {
     InputEvent::initialize(other->mDeviceId, other->mSource);
     mAction = other->mAction;
     mFlags = other->mFlags;
     mEdgeFlags = other->mEdgeFlags;
     mMetaState = other->mMetaState;
     mButtonState = other->mButtonState;
     mXOffset = other->mXOffset;
     mYOffset = other->mYOffset;
     mXPrecision = other->mXPrecision;
     mYPrecision = other->mYPrecision;
     mDownTime = other->mDownTime;
     mPointerProperties = other->mPointerProperties;
     if (keepHistory) {
         mSampleEventTimes = other->mSampleEventTimes;
         mSamplePointerCoords = other->mSamplePointerCoords;
     } else {
         mSampleEventTimes.clear();
         mSampleEventTimes.push(other->getEventTime());
         mSamplePointerCoords.clear();
         size_t pointerCount = other->getPointerCount();
         size_t historySize = other->getHistorySize();
         mSamplePointerCoords.appendArray(other->mSamplePointerCoords.array()
                 + (historySize * pointerCount), pointerCount);
     }
 }
 void MotionEvent::addSample(
         int64_t eventTime,
         const PointerCoords* pointerCoords) {
     mSampleEventTimes.push(eventTime);
     mSamplePointerCoords.appendArray(pointerCoords, getPointerCount());
 }
 const PointerCoords* MotionEvent::getRawPointerCoords(size_t pointerIndex) const {
     return &mSamplePointerCoords[getHistorySize() * getPointerCount() + pointerIndex];
 }
 float MotionEvent::getRawAxisValue(int32_t axis, size_t pointerIndex) const {
     return getRawPointerCoords(pointerIndex)->getAxisValue(axis);
 }
 float MotionEvent::getAxisValue(int32_t axis, size_t pointerIndex) const {
     float value = getRawPointerCoords(pointerIndex)->getAxisValue(axis);
     switch (axis) {
     case AMOTION_EVENT_AXIS_X:
         return value + mXOffset;
     case AMOTION_EVENT_AXIS_Y:
         return value + mYOffset;
     }
     return value;
 }
 const PointerCoords* MotionEvent::getHistoricalRawPointerCoords(
         size_t pointerIndex, size_t historicalIndex) const {
     return &mSamplePointerCoords[historicalIndex * getPointerCount() + pointerIndex];
 }
 float MotionEvent::getHistoricalRawAxisValue(int32_t axis, size_t pointerIndex,
         size_t historicalIndex) const {
     return getHistoricalRawPointerCoords(pointerIndex, historicalIndex)->getAxisValue(axis);
 }
 float MotionEvent::getHistoricalAxisValue(int32_t axis, size_t pointerIndex,
         size_t historicalIndex) const {
     float value = getHistoricalRawPointerCoords(pointerIndex, historicalIndex)->getAxisValue(axis);
     switch (axis) {
     case AMOTION_EVENT_AXIS_X:
         return value + mXOffset;
     case AMOTION_EVENT_AXIS_Y:
         return value + mYOffset;
     }
     return value;
 }
 ssize_t MotionEvent::findPointerIndex(int32_t pointerId) const {
     size_t pointerCount = mPointerProperties.size();
     for (size_t i = 0; i < pointerCount; i++) {
         if (mPointerProperties.itemAt(i).id == pointerId) {
             return i;
         }
     }
     return -1;
 }
 void MotionEvent::offsetLocation(float xOffset, float yOffset) {
     mXOffset += xOffset;
     mYOffset += yOffset;
 }
 void MotionEvent::scale(float scaleFactor) {
     mXOffset *= scaleFactor;
     mYOffset *= scaleFactor;
     mXPrecision *= scaleFactor;
     mYPrecision *= scaleFactor;
     size_t numSamples = mSamplePointerCoords.size();
     for (size_t i = 0; i < numSamples; i++) {
         mSamplePointerCoords.editItemAt(i).scale(scaleFactor);
     }
 }
 #ifdef HAVE_ANDROID_OS
 static inline float transformAngle(const SkMatrix* matrix, float angleRadians) {
     // Construct and transform a vector oriented at the specified clockwise angle from vertical.
     // Coordinate system: down is increasing Y, right is increasing X.
     SkPoint vector;
     vector.fX = SkFloatToScalar(sinf(angleRadians));
     vector.fY = SkFloatToScalar(-cosf(angleRadians));
     matrix->mapVectors(& vector, 1);
     // Derive the transformed vector's clockwise angle from vertical.
     float result = atan2f(SkScalarToFloat(vector.fX), SkScalarToFloat(-vector.fY));
     if (result < - M_PI_2) {
         result += M_PI;
     } else if (result > M_PI_2) {
         result -= M_PI;
     }
     return result;
 }
 void MotionEvent::transform(const SkMatrix* matrix) {
     float oldXOffset = mXOffset;
     float oldYOffset = mYOffset;
     // The tricky part of this implementation is to preserve the value of
     // rawX and rawY.  So we apply the transformation to the first point
     // then derive an appropriate new X/Y offset that will preserve rawX and rawY.
     SkPoint point;
     float rawX = getRawX(0);
     float rawY = getRawY(0);
     matrix->mapXY(SkFloatToScalar(rawX + oldXOffset), SkFloatToScalar(rawY + oldYOffset),
             & point);
     float newX = SkScalarToFloat(point.fX);
     float newY = SkScalarToFloat(point.fY);
     float newXOffset = newX - rawX;
     float newYOffset = newY - rawY;
     mXOffset = newXOffset;
     mYOffset = newYOffset;
     // Apply the transformation to all samples.
     size_t numSamples = mSamplePointerCoords.size();
     for (size_t i = 0; i < numSamples; i++) {
         PointerCoords& c = mSamplePointerCoords.editItemAt(i);
         float x = c.getAxisValue(AMOTION_EVENT_AXIS_X) + oldXOffset;
         float y = c.getAxisValue(AMOTION_EVENT_AXIS_Y) + oldYOffset;
         matrix->mapXY(SkFloatToScalar(x), SkFloatToScalar(y), &point);
         c.setAxisValue(AMOTION_EVENT_AXIS_X, SkScalarToFloat(point.fX) - newXOffset);
         c.setAxisValue(AMOTION_EVENT_AXIS_Y, SkScalarToFloat(point.fY) - newYOffset);
         float orientation = c.getAxisValue(AMOTION_EVENT_AXIS_ORIENTATION);
         c.setAxisValue(AMOTION_EVENT_AXIS_ORIENTATION, transformAngle(matrix, orientation));
     }
 }
 status_t MotionEvent::readFromParcel(Parcel* parcel) {
     size_t pointerCount = parcel->readInt32();
     size_t sampleCount = parcel->readInt32();
     if (pointerCount == 0 || pointerCount > MAX_POINTERS || sampleCount == 0) {
         return BAD_VALUE;
     }
     mDeviceId = parcel->readInt32();
     mSource = parcel->readInt32();
     mAction = parcel->readInt32();
     mFlags = parcel->readInt32();
     mEdgeFlags = parcel->readInt32();
     mMetaState = parcel->readInt32();
     mButtonState = parcel->readInt32();
     mXOffset = parcel->readFloat();
     mYOffset = parcel->readFloat();
     mXPrecision = parcel->readFloat();
     mYPrecision = parcel->readFloat();
     mDownTime = parcel->readInt64();
     mPointerProperties.clear();
     mPointerProperties.setCapacity(pointerCount);
     mSampleEventTimes.clear();
     mSampleEventTimes.setCapacity(sampleCount);
     mSamplePointerCoords.clear();
     mSamplePointerCoords.setCapacity(sampleCount * pointerCount);
     for (size_t i = 0; i < pointerCount; i++) {
         mPointerProperties.push();
         PointerProperties& properties = mPointerProperties.editTop();
         properties.id = parcel->readInt32();
         properties.toolType = parcel->readInt32();
     }
     while (sampleCount-- > 0) {
         mSampleEventTimes.push(parcel->readInt64());
         for (size_t i = 0; i < pointerCount; i++) {
             mSamplePointerCoords.push();
             status_t status = mSamplePointerCoords.editTop().readFromParcel(parcel);
             if (status) {
                 return status;
             }
         }
     }
     return OK;
 }
 status_t MotionEvent::writeToParcel(Parcel* parcel) const {
     size_t pointerCount = mPointerProperties.size();
     size_t sampleCount = mSampleEventTimes.size();
     parcel->writeInt32(pointerCount);
     parcel->writeInt32(sampleCount);
     parcel->writeInt32(mDeviceId);
     parcel->writeInt32(mSource);
     parcel->writeInt32(mAction);
     parcel->writeInt32(mFlags);
     parcel->writeInt32(mEdgeFlags);
     parcel->writeInt32(mMetaState);
     parcel->writeInt32(mButtonState);
     parcel->writeFloat(mXOffset);
     parcel->writeFloat(mYOffset);
     parcel->writeFloat(mXPrecision);
     parcel->writeFloat(mYPrecision);
     parcel->writeInt64(mDownTime);
     for (size_t i = 0; i < pointerCount; i++) {
         const PointerProperties& properties = mPointerProperties.itemAt(i);
         parcel->writeInt32(properties.id);
         parcel->writeInt32(properties.toolType);
     }
     const PointerCoords* pc = mSamplePointerCoords.array();
     for (size_t h = 0; h < sampleCount; h++) {
         parcel->writeInt64(mSampleEventTimes.itemAt(h));
         for (size_t i = 0; i < pointerCount; i++) {
             status_t status = (pc++)->writeToParcel(parcel);
             if (status) {
                 return status;
             }
         }
     }
     return OK;
 }
 #endif
 bool MotionEvent::isTouchEvent(int32_t source, int32_t action) {
     if (source & AINPUT_SOURCE_CLASS_POINTER) {
         // Specifically excludes HOVER_MOVE and SCROLL.
         switch (action & AMOTION_EVENT_ACTION_MASK) {
         case AMOTION_EVENT_ACTION_DOWN:
         case AMOTION_EVENT_ACTION_MOVE:
         case AMOTION_EVENT_ACTION_UP:
         case AMOTION_EVENT_ACTION_POINTER_DOWN:
         case AMOTION_EVENT_ACTION_POINTER_UP:
         case AMOTION_EVENT_ACTION_CANCEL:
         case AMOTION_EVENT_ACTION_OUTSIDE:
             return true;
         }
     }
     return false;
 }
 // --- PooledInputEventFactory ---
 PooledInputEventFactory::PooledInputEventFactory(size_t maxPoolSize) :
         mMaxPoolSize(maxPoolSize) {
 }
 PooledInputEventFactory::~PooledInputEventFactory() {
     for (size_t i = 0; i < mKeyEventPool.size(); i++) {
         delete mKeyEventPool.itemAt(i);
     }
     for (size_t i = 0; i < mMotionEventPool.size(); i++) {
         delete mMotionEventPool.itemAt(i);
     }
 }
 KeyEvent* PooledInputEventFactory::createKeyEvent() {
     if (!mKeyEventPool.isEmpty()) {
         KeyEvent* event = mKeyEventPool.top();
         mKeyEventPool.pop();
         return event;
     }
     return new KeyEvent();
 }
 MotionEvent* PooledInputEventFactory::createMotionEvent() {
     if (!mMotionEventPool.isEmpty()) {
         MotionEvent* event = mMotionEventPool.top();
         mMotionEventPool.pop();
         return event;
     }
     return new MotionEvent();
 }
 void PooledInputEventFactory::recycle(InputEvent* event) {
     switch (event->getType()) {
     case AINPUT_EVENT_TYPE_KEY:
         if (mKeyEventPool.size() < mMaxPoolSize) {
             mKeyEventPool.push(static_cast<KeyEvent*>(event));
             return;
         }
         break;
     case AINPUT_EVENT_TYPE_MOTION:
         if (mMotionEventPool.size() < mMaxPoolSize) {
             mMotionEventPool.push(static_cast<MotionEvent*>(event));
             return;
         }
         break;
     }
     delete event;
 }
 } // namespace android

The Tor Browser / annotate

widget/gonk/libui/Input.cpp@ac0c01689b40 (annotated)

widget/gonk/libui/Input.cpp