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/*
* Copyright 2017 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "StatsLayer.h"
#include "SkCanvas.h"
#include "SkString.h"
#include "SkTime.h"
StatsLayer::StatsLayer()
: fCurrentMeasurement(0)
, fCumulativeMeasurementTime(0)
, fCumulativeMeasurementCount(0)
, fDisplayScale(1.0f) {}
void StatsLayer::resetMeasurements() {
for (int i = 0; i < fTimers.count(); ++i) {
memset(fTimers[i].fTimes, 0, sizeof(fTimers[i].fTimes));
}
fCurrentMeasurement = 0;
fCumulativeMeasurementTime = 0;
fCumulativeMeasurementCount = 0;
}
StatsLayer::Timer StatsLayer::addTimer(const char* label, SkColor color, SkColor labelColor) {
Timer newTimer = fTimers.count();
TimerData& newData = fTimers.push_back();
memset(newData.fTimes, 0, sizeof(newData.fTimes));
newData.fLabel = label;
newData.fColor = color;
newData.fLabelColor = labelColor ? labelColor : color;
return newTimer;
}
void StatsLayer::beginTiming(Timer timer) {
fTimers[timer].fTimes[fCurrentMeasurement] -= SkTime::GetMSecs();
}
void StatsLayer::endTiming(Timer timer) {
fTimers[timer].fTimes[fCurrentMeasurement] += SkTime::GetMSecs();
}
double StatsLayer::getLastTime(Timer timer) {
int idx = (fCurrentMeasurement + (kMeasurementCount - 1)) & (kMeasurementCount - 1);
return fTimers[timer].fTimes[idx];
}
void StatsLayer::onPaint(SkCanvas* canvas) {
// Advance our timing bookkeeping
for (int i = 0; i < fTimers.count(); ++i) {
fCumulativeMeasurementTime += fTimers[i].fTimes[fCurrentMeasurement];
}
fCumulativeMeasurementCount++;
fCurrentMeasurement = (fCurrentMeasurement + 1) & (kMeasurementCount - 1);
SkASSERT(fCurrentMeasurement < kMeasurementCount);
for (int i = 0; i < fTimers.count(); ++i) {
fTimers[i].fTimes[fCurrentMeasurement] = 0;
}
#ifdef SK_BUILD_FOR_ANDROID
// Scale up the stats overlay on Android devices
static constexpr SkScalar kScale = 1.5;
#else
SkScalar kScale = fDisplayScale;
#endif
// Now draw everything
static const float kPixelPerMS = 2.0f;
static const int kDisplayWidth = 192;
static const int kGraphHeight = 100;
static const int kTextHeight = 60;
static const int kDisplayHeight = kGraphHeight + kTextHeight;
static const int kDisplayPadding = 10;
static const int kGraphPadding = 3;
static const SkScalar kBaseMS = 1000.f / 60.f; // ms/frame to hit 60 fps
SkISize canvasSize = canvas->getBaseLayerSize();
SkRect rect = SkRect::MakeXYWH(SkIntToScalar(canvasSize.fWidth-kDisplayWidth-kDisplayPadding),
SkIntToScalar(kDisplayPadding),
SkIntToScalar(kDisplayWidth), SkIntToScalar(kDisplayHeight));
SkPaint paint;
canvas->save();
// Scale the canvas while keeping the right edge in place.
canvas->concat(SkMatrix::MakeRectToRect(SkRect::Make(canvasSize),
SkRect::MakeXYWH(canvasSize.width() * (1 - kScale),
0,
canvasSize.width() * kScale,
canvasSize.height() * kScale),
SkMatrix::kFill_ScaleToFit));
paint.setColor(SK_ColorBLACK);
canvas->drawRect(rect, paint);
// draw the 16ms line
paint.setColor(SK_ColorLTGRAY);
canvas->drawLine(rect.fLeft, rect.fBottom - kBaseMS*kPixelPerMS,
rect.fRight, rect.fBottom - kBaseMS*kPixelPerMS, paint);
paint.setColor(SK_ColorRED);
paint.setStyle(SkPaint::kStroke_Style);
canvas->drawRect(rect, paint);
paint.setStyle(SkPaint::kFill_Style);
int x = SkScalarTruncToInt(rect.fLeft) + kGraphPadding;
const int xStep = 3;
int i = fCurrentMeasurement;
double ms = 0;
SkTDArray<double> sumTimes;
sumTimes.setCount(fTimers.count());
memset(sumTimes.begin(), 0, sumTimes.count() * sizeof(double));
int count = 0;
do {
int startY = SkScalarTruncToInt(rect.fBottom);
double inc = 0;
for (int timer = 0; timer < fTimers.count(); ++timer) {
int height = (int)(fTimers[timer].fTimes[i] * kPixelPerMS + 0.5);
int endY = SkTMax(startY - height, kDisplayPadding + kTextHeight);
paint.setColor(fTimers[timer].fColor);
canvas->drawLine(SkIntToScalar(x), SkIntToScalar(startY),
SkIntToScalar(x), SkIntToScalar(endY), paint);
startY = endY;
inc += fTimers[timer].fTimes[i];
sumTimes[timer] += fTimers[timer].fTimes[i];
}
if (inc > 0) {
ms += inc;
++count;
}
i++;
i &= (kMeasurementCount - 1); // fast mod
x += xStep;
} while (i != fCurrentMeasurement);
paint.setTextSize(16);
SkString mainString;
mainString.appendf("%4.3f ms -> %4.3f ms", ms / SkTMax(1, count),
fCumulativeMeasurementTime / SkTMax(1, fCumulativeMeasurementCount));
paint.setColor(SK_ColorWHITE);
canvas->drawString(mainString.c_str(), rect.fLeft + 3, rect.fTop + 14, paint);
for (int timer = 0; timer < fTimers.count(); ++timer) {
SkString str;
str.appendf("%s: %4.3f ms", fTimers[timer].fLabel.c_str(),
sumTimes[timer] / SkTMax(1, count));
paint.setColor(fTimers[timer].fLabelColor);
canvas->drawString(str, rect.fLeft + 3, rect.fTop + 28 + (14 * timer), paint);
}
canvas->restore();
}
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