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/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "FrameUniformityData.h"
#include <map>
#include "Units.h"
#include "gfxPoint.h"
#include "mozilla/TimeStamp.h"
#include "mozilla/dom/APZTestDataBinding.h"
#include "mozilla/dom/ToJSValue.h"
#include "nsTArray.h"
namespace mozilla {
namespace layers {
using namespace gfx;
Point
LayerTransforms::GetAverage()
{
MOZ_ASSERT(!mTransforms.IsEmpty());
Point current = mTransforms[0];
Point average;
size_t length = mTransforms.Length();
for (size_t i = 1; i < length; i++) {
Point nextTransform = mTransforms[i];
Point movement = nextTransform - current;
average += Point(std::fabs(movement.x), std::fabs(movement.y));
current = nextTransform;
}
average = average / (float) length;
return average;
}
Point
LayerTransforms::GetStdDev()
{
Point average = GetAverage();
Point stdDev;
Point current = mTransforms[0];
for (size_t i = 1; i < mTransforms.Length(); i++) {
Point next = mTransforms[i];
Point move = next - current;
move.x = fabs(move.x);
move.y = fabs(move.y);
Point diff = move - average;
diff.x = diff.x * diff.x;
diff.y = diff.y * diff.y;
stdDev += diff;
current = next;
}
stdDev = stdDev / mTransforms.Length();
stdDev.x = sqrt(stdDev.x);
stdDev.y = sqrt(stdDev.y);
return stdDev;
}
LayerTransformRecorder::~LayerTransformRecorder()
{
Reset();
}
void
LayerTransformRecorder::RecordTransform(Layer* aLayer, const Point& aTransform)
{
LayerTransforms* layerTransforms = GetLayerTransforms((uintptr_t) aLayer);
layerTransforms->mTransforms.AppendElement(aTransform);
}
void
LayerTransformRecorder::EndTest(FrameUniformityData* aOutData)
{
for (auto iter = mFrameTransforms.begin(); iter != mFrameTransforms.end(); ++iter) {
uintptr_t layer = iter->first;
float uniformity = CalculateFrameUniformity(layer);
std::pair<uintptr_t,float> result(layer, uniformity);
aOutData->mUniformities.insert(result);
}
Reset();
}
LayerTransforms*
LayerTransformRecorder::GetLayerTransforms(uintptr_t aLayer)
{
if (!mFrameTransforms.count(aLayer)) {
LayerTransforms* newTransform = new LayerTransforms();
std::pair<uintptr_t, LayerTransforms*> newLayer(aLayer, newTransform);
mFrameTransforms.insert(newLayer);
}
return mFrameTransforms.find(aLayer)->second;
}
void
LayerTransformRecorder::Reset()
{
for (auto iter = mFrameTransforms.begin(); iter != mFrameTransforms.end(); ++iter) {
LayerTransforms* layerTransforms = iter->second;
delete layerTransforms;
}
mFrameTransforms.clear();
}
float
LayerTransformRecorder::CalculateFrameUniformity(uintptr_t aLayer)
{
LayerTransforms* layerTransform = GetLayerTransforms(aLayer);
float yUniformity = -1;
if (!layerTransform->mTransforms.IsEmpty()) {
Point stdDev = layerTransform->GetStdDev();
yUniformity = stdDev.y;
}
return yUniformity;
}
bool
FrameUniformityData::ToJS(JS::MutableHandleValue aOutValue, JSContext* aContext)
{
dom::FrameUniformityResults results;
dom::Sequence<dom::FrameUniformity>& layers = results.mLayerUniformities.Construct();
for (auto iter = mUniformities.begin(); iter != mUniformities.end(); ++iter) {
uintptr_t layerAddr = iter->first;
float uniformity = iter->second;
// FIXME: Make this infallible after bug 968520 is done.
MOZ_ALWAYS_TRUE(layers.AppendElement(fallible));
dom::FrameUniformity& entry = layers.LastElement();
entry.mLayerAddress.Construct() = layerAddr;
entry.mFrameUniformity.Construct() = uniformity;
}
return dom::ToJSValue(aContext, results, aOutValue);
}
} // namespace layers
} // namespace mozilla
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