/* * Copyright 2013 Google Inc. * * Use of this source code is governed by a BSD-style license that can be * found in the LICENSE file. */ #include "bench/Benchmark.h" #include "include/core/SkCanvas.h" #include "include/core/SkPaint.h" #include "include/core/SkPath.h" #include "include/private/SkTDArray.h" #include "include/utils/SkRandom.h" /** * This is a conversion of samplecode/SampleChart.cpp into a bench. It sure would be nice to be able * to write one subclass that can be a GM, bench, and/or Sample. */ // Generates y values for the chart plots. static void gen_data(SkScalar yAvg, SkScalar ySpread, int count, SkRandom* random, SkTDArray* dataPts) { dataPts->setCount(count); for (int i = 0; i < count; ++i) { (*dataPts)[i] = random->nextRangeScalar(yAvg - SkScalarHalf(ySpread), yAvg + SkScalarHalf(ySpread)); } } // Generates a path to stroke along the top of each plot and a fill path for the area below each // plot. The fill path is bounded below by the bottomData plot points or a horizontal line at // yBase if bottomData == nullptr. // The plots are animated by rotating the data points by leftShift. static void gen_paths(const SkTDArray& topData, const SkTDArray* bottomData, SkScalar yBase, SkScalar xLeft, SkScalar xDelta, int leftShift, SkPath* plot, SkPath* fill) { plot->rewind(); fill->rewind(); plot->incReserve(topData.count()); if (nullptr == bottomData) { fill->incReserve(topData.count() + 2); } else { fill->incReserve(2 * topData.count()); } leftShift %= topData.count(); SkScalar x = xLeft; // Account for the leftShift using two loops int shiftToEndCount = topData.count() - leftShift; plot->moveTo(x, topData[leftShift]); fill->moveTo(x, topData[leftShift]); for (int i = 1; i < shiftToEndCount; ++i) { plot->lineTo(x, topData[i + leftShift]); fill->lineTo(x, topData[i + leftShift]); x += xDelta; } for (int i = 0; i < leftShift; ++i) { plot->lineTo(x, topData[i]); fill->lineTo(x, topData[i]); x += xDelta; } if (bottomData) { SkASSERT(bottomData->count() == topData.count()); // iterate backwards over the previous graph's data to generate the bottom of the filled // area (and account for leftShift). for (int i = 0; i < leftShift; ++i) { x -= xDelta; fill->lineTo(x, (*bottomData)[leftShift - 1 - i]); } for (int i = 0; i < shiftToEndCount; ++i) { x -= xDelta; fill->lineTo(x, (*bottomData)[bottomData->count() - 1 - i]); } } else { fill->lineTo(x - xDelta, yBase); fill->lineTo(xLeft, yBase); } } // A set of scrolling line plots with the area between each plot filled. Stresses out GPU path // filling class ChartBench : public Benchmark { public: ChartBench(bool aa) { fShift = 0; fAA = aa; fSize.fWidth = -1; fSize.fHeight = -1; } protected: const char* onGetName() override { if (fAA) { return "chart_aa"; } else { return "chart_bw"; } } void onDraw(int loops, SkCanvas* canvas) override { bool sizeChanged = false; if (canvas->getBaseLayerSize() != fSize) { fSize = canvas->getBaseLayerSize(); sizeChanged = true; } SkScalar ySpread = SkIntToScalar(fSize.fHeight / 20); SkScalar height = SkIntToScalar(fSize.fHeight); if (sizeChanged) { int dataPointCount = SkMax32(fSize.fWidth / kPixelsPerTick + 1, 2); SkRandom random; for (int i = 0; i < kNumGraphs; ++i) { SkScalar y = (kNumGraphs - i) * (height - ySpread) / (kNumGraphs + 1); fData[i].reset(); gen_data(y, ySpread, dataPointCount, &random, fData + i); } } SkRandom colorRand; SkColor colors[kNumGraphs]; for (int i = 0; i < kNumGraphs; ++i) { colors[i] = colorRand.nextU() | 0xff000000; } for (int frame = 0; frame < loops; ++frame) { SkPath plotPath; SkPath fillPath; static const SkScalar kStrokeWidth = SkIntToScalar(2); SkPaint plotPaint; SkPaint fillPaint; plotPaint.setAntiAlias(fAA); plotPaint.setStyle(SkPaint::kStroke_Style); plotPaint.setStrokeWidth(kStrokeWidth); plotPaint.setStrokeCap(SkPaint::kRound_Cap); plotPaint.setStrokeJoin(SkPaint::kRound_Join); fillPaint.setAntiAlias(fAA); fillPaint.setStyle(SkPaint::kFill_Style); SkTDArray* prevData = nullptr; for (int i = 0; i < kNumGraphs; ++i) { gen_paths(fData[i], prevData, height, 0, SkIntToScalar(kPixelsPerTick), fShift, &plotPath, &fillPath); // Make the fills partially transparent fillPaint.setColor((colors[i] & 0x00ffffff) | 0x80000000); canvas->drawPath(fillPath, fillPaint); plotPaint.setColor(colors[i]); canvas->drawPath(plotPath, plotPaint); prevData = fData + i; } fShift += kShiftPerFrame; } } private: enum { kNumGraphs = 5, kPixelsPerTick = 3, kShiftPerFrame = 1, }; int fShift; SkISize fSize; SkTDArray fData[kNumGraphs]; bool fAA; typedef Benchmark INHERITED; }; ////////////////////////////////////////////////////////////////////////////// DEF_BENCH( return new ChartBench(true); ) DEF_BENCH( return new ChartBench(false); )