Line data    Source code

       1             : /* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
       2             :  * This Source Code Form is subject to the terms of the Mozilla Public
       3             :  * License, v. 2.0. If a copy of the MPL was not distributed with this
       4             :  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
       5             : 
       6             : #include "FrameUniformityData.h"
       7             : 
       8             : #include <map>
       9             : 
      10             : #include "Units.h"
      11             : #include "gfxPoint.h"
      12             : #include "mozilla/TimeStamp.h"
      13             : #include "mozilla/dom/APZTestDataBinding.h"
      14             : #include "mozilla/dom/ToJSValue.h"
      15             : #include "nsTArray.h"
      16             : 
      17             : namespace mozilla {
      18             : namespace layers {
      19             : 
      20             : using namespace gfx;
      21             : 
      22             : Point
      23           0 : LayerTransforms::GetAverage()
      24             : {
      25           0 :   MOZ_ASSERT(!mTransforms.IsEmpty());
      26             : 
      27           0 :   Point current = mTransforms[0];
      28           0 :   Point average;
      29           0 :   size_t length = mTransforms.Length();
      30             : 
      31           0 :   for (size_t i = 1; i < length; i++) {
      32           0 :     Point nextTransform = mTransforms[i];
      33           0 :     Point movement = nextTransform - current;
      34           0 :     average += Point(std::fabs(movement.x), std::fabs(movement.y));
      35           0 :     current = nextTransform;
      36             :   }
      37             : 
      38           0 :   average = average / (float) length;
      39           0 :   return average;
      40             : }
      41             : 
      42             : Point
      43           0 : LayerTransforms::GetStdDev()
      44             : {
      45           0 :   Point average = GetAverage();
      46           0 :   Point stdDev;
      47           0 :   Point current = mTransforms[0];
      48             : 
      49           0 :   for (size_t i = 1; i < mTransforms.Length(); i++) {
      50           0 :     Point next = mTransforms[i];
      51           0 :     Point move = next - current;
      52           0 :     move.x = fabs(move.x);
      53           0 :     move.y = fabs(move.y);
      54             : 
      55           0 :     Point diff = move - average;
      56           0 :     diff.x = diff.x * diff.x;
      57           0 :     diff.y = diff.y * diff.y;
      58           0 :     stdDev += diff;
      59             : 
      60           0 :     current = next;
      61             :   }
      62             : 
      63           0 :   stdDev = stdDev / mTransforms.Length();
      64           0 :   stdDev.x = sqrt(stdDev.x);
      65           0 :   stdDev.y = sqrt(stdDev.y);
      66           0 :   return stdDev;
      67             : }
      68             : 
      69           0 : LayerTransformRecorder::~LayerTransformRecorder()
      70             : {
      71           0 :   Reset();
      72           0 : }
      73             : 
      74             : void
      75           0 : LayerTransformRecorder::RecordTransform(Layer* aLayer, const Point& aTransform)
      76             : {
      77           0 :   LayerTransforms* layerTransforms = GetLayerTransforms((uintptr_t) aLayer);
      78           0 :   layerTransforms->mTransforms.AppendElement(aTransform);
      79           0 : }
      80             : 
      81             : void
      82           0 : LayerTransformRecorder::EndTest(FrameUniformityData* aOutData)
      83             : {
      84           0 :   for (auto iter = mFrameTransforms.begin(); iter != mFrameTransforms.end(); ++iter) {
      85           0 :     uintptr_t layer = iter->first;
      86           0 :     float uniformity = CalculateFrameUniformity(layer);
      87             : 
      88           0 :     std::pair<uintptr_t,float> result(layer, uniformity);
      89           0 :     aOutData->mUniformities.insert(result);
      90             :   }
      91             : 
      92           0 :   Reset();
      93           0 : }
      94             : 
      95             : LayerTransforms*
      96           0 : LayerTransformRecorder::GetLayerTransforms(uintptr_t aLayer)
      97             : {
      98           0 :   if (!mFrameTransforms.count(aLayer)) {
      99           0 :     LayerTransforms* newTransform = new LayerTransforms();
     100           0 :     std::pair<uintptr_t, LayerTransforms*> newLayer(aLayer, newTransform);
     101           0 :     mFrameTransforms.insert(newLayer);
     102             :   }
     103             : 
     104           0 :   return mFrameTransforms.find(aLayer)->second;
     105             : }
     106             : 
     107             : void
     108           0 : LayerTransformRecorder::Reset()
     109             : {
     110           0 :   for (auto iter = mFrameTransforms.begin(); iter != mFrameTransforms.end(); ++iter) {
     111           0 :     LayerTransforms* layerTransforms = iter->second;
     112           0 :     delete layerTransforms;
     113             :   }
     114             : 
     115           0 :   mFrameTransforms.clear();
     116           0 : }
     117             : 
     118             : float
     119           0 : LayerTransformRecorder::CalculateFrameUniformity(uintptr_t aLayer)
     120             : {
     121           0 :   LayerTransforms* layerTransform = GetLayerTransforms(aLayer);
     122           0 :   float yUniformity = -1;
     123           0 :   if (!layerTransform->mTransforms.IsEmpty()) {
     124           0 :     Point stdDev = layerTransform->GetStdDev();
     125           0 :     yUniformity = stdDev.y;
     126             :   }
     127           0 :   return yUniformity;
     128             : }
     129             : 
     130             : bool
     131           0 : FrameUniformityData::ToJS(JS::MutableHandleValue aOutValue, JSContext* aContext)
     132             : {
     133           0 :   dom::FrameUniformityResults results;
     134           0 :   dom::Sequence<dom::FrameUniformity>& layers = results.mLayerUniformities.Construct();
     135             : 
     136           0 :   for (auto iter = mUniformities.begin(); iter != mUniformities.end(); ++iter) {
     137           0 :     uintptr_t layerAddr = iter->first;
     138           0 :     float uniformity = iter->second;
     139             : 
     140             :     // FIXME: Make this infallible after bug 968520 is done.
     141           0 :     MOZ_ALWAYS_TRUE(layers.AppendElement(fallible));
     142           0 :     dom::FrameUniformity& entry = layers.LastElement();
     143             : 
     144           0 :     entry.mLayerAddress.Construct() = layerAddr;
     145           0 :     entry.mFrameUniformity.Construct() = uniformity;
     146             :   }
     147             : 
     148           0 :   return dom::ToJSValue(aContext, results, aOutValue);
     149             : }
     150             : 
     151             : } // namespace layers
     152             : } // namespace mozilla