1 /*
2 * Copyright 2013 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8 #include "Benchmark.h"
9 #include "SkCanvas.h"
10 #include "SkPaint.h"
11 #include "SkPath.h"
12 #include "SkRandom.h"
13 #include "SkTDArray.h"
14
15 /**
16 * This is a conversion of samplecode/SampleChart.cpp into a bench. It sure would be nice to be able
17 * to write one subclass that can be a GM, bench, and/or Sample.
18 */
19
20 // Generates y values for the chart plots.
gen_data(SkScalar yAvg,SkScalar ySpread,int count,SkRandom * random,SkTDArray<SkScalar> * dataPts)21 static void gen_data(SkScalar yAvg, SkScalar ySpread, int count,
22 SkRandom* random, SkTDArray<SkScalar>* dataPts) {
23 dataPts->setCount(count);
24 for (int i = 0; i < count; ++i) {
25 (*dataPts)[i] = random->nextRangeScalar(yAvg - SkScalarHalf(ySpread),
26 yAvg + SkScalarHalf(ySpread));
27 }
28 }
29
30 // Generates a path to stroke along the top of each plot and a fill path for the area below each
31 // plot. The fill path is bounded below by the bottomData plot points or a horizontal line at
32 // yBase if bottomData == nullptr.
33 // The plots are animated by rotating the data points by leftShift.
gen_paths(const SkTDArray<SkScalar> & topData,const SkTDArray<SkScalar> * bottomData,SkScalar yBase,SkScalar xLeft,SkScalar xDelta,int leftShift,SkPath * plot,SkPath * fill)34 static void gen_paths(const SkTDArray<SkScalar>& topData,
35 const SkTDArray<SkScalar>* bottomData,
36 SkScalar yBase,
37 SkScalar xLeft, SkScalar xDelta,
38 int leftShift,
39 SkPath* plot, SkPath* fill) {
40 plot->rewind();
41 fill->rewind();
42 plot->incReserve(topData.count());
43 if (nullptr == bottomData) {
44 fill->incReserve(topData.count() + 2);
45 } else {
46 fill->incReserve(2 * topData.count());
47 }
48
49 leftShift %= topData.count();
50 SkScalar x = xLeft;
51
52 // Account for the leftShift using two loops
53 int shiftToEndCount = topData.count() - leftShift;
54 plot->moveTo(x, topData[leftShift]);
55 fill->moveTo(x, topData[leftShift]);
56
57 for (int i = 1; i < shiftToEndCount; ++i) {
58 plot->lineTo(x, topData[i + leftShift]);
59 fill->lineTo(x, topData[i + leftShift]);
60 x += xDelta;
61 }
62
63 for (int i = 0; i < leftShift; ++i) {
64 plot->lineTo(x, topData[i]);
65 fill->lineTo(x, topData[i]);
66 x += xDelta;
67 }
68
69 if (bottomData) {
70 SkASSERT(bottomData->count() == topData.count());
71 // iterate backwards over the previous graph's data to generate the bottom of the filled
72 // area (and account for leftShift).
73 for (int i = 0; i < leftShift; ++i) {
74 x -= xDelta;
75 fill->lineTo(x, (*bottomData)[leftShift - 1 - i]);
76 }
77 for (int i = 0; i < shiftToEndCount; ++i) {
78 x -= xDelta;
79 fill->lineTo(x, (*bottomData)[bottomData->count() - 1 - i]);
80 }
81 } else {
82 fill->lineTo(x - xDelta, yBase);
83 fill->lineTo(xLeft, yBase);
84 }
85 }
86
87 // A set of scrolling line plots with the area between each plot filled. Stresses out GPU path
88 // filling
89 class ChartBench : public Benchmark {
90 public:
ChartBench(bool aa)91 ChartBench(bool aa) {
92 fShift = 0;
93 fAA = aa;
94 fSize.fWidth = -1;
95 fSize.fHeight = -1;
96 }
97
98 protected:
onGetName()99 const char* onGetName() override {
100 if (fAA) {
101 return "chart_aa";
102 } else {
103 return "chart_bw";
104 }
105 }
106
onDraw(int loops,SkCanvas * canvas)107 void onDraw(int loops, SkCanvas* canvas) override {
108 bool sizeChanged = false;
109 if (canvas->getBaseLayerSize() != fSize) {
110 fSize = canvas->getBaseLayerSize();
111 sizeChanged = true;
112 }
113
114 SkScalar ySpread = SkIntToScalar(fSize.fHeight / 20);
115
116 SkScalar height = SkIntToScalar(fSize.fHeight);
117 if (sizeChanged) {
118 int dataPointCount = SkMax32(fSize.fWidth / kPixelsPerTick + 1, 2);
119
120 SkRandom random;
121 for (int i = 0; i < kNumGraphs; ++i) {
122 SkScalar y = (kNumGraphs - i) * (height - ySpread) / (kNumGraphs + 1);
123 fData[i].reset();
124 gen_data(y, ySpread, dataPointCount, &random, fData + i);
125 }
126 }
127
128 SkRandom colorRand;
129 SkColor colors[kNumGraphs];
130 for (int i = 0; i < kNumGraphs; ++i) {
131 colors[i] = colorRand.nextU() | 0xff000000;
132 }
133
134 for (int frame = 0; frame < loops; ++frame) {
135
136 canvas->clear(0xFFE0F0E0);
137
138 SkPath plotPath;
139 SkPath fillPath;
140
141 static const SkScalar kStrokeWidth = SkIntToScalar(2);
142 SkPaint plotPaint;
143 SkPaint fillPaint;
144 plotPaint.setAntiAlias(fAA);
145 plotPaint.setStyle(SkPaint::kStroke_Style);
146 plotPaint.setStrokeWidth(kStrokeWidth);
147 plotPaint.setStrokeCap(SkPaint::kRound_Cap);
148 plotPaint.setStrokeJoin(SkPaint::kRound_Join);
149 fillPaint.setAntiAlias(fAA);
150 fillPaint.setStyle(SkPaint::kFill_Style);
151
152 SkTDArray<SkScalar>* prevData = nullptr;
153 for (int i = 0; i < kNumGraphs; ++i) {
154 gen_paths(fData[i],
155 prevData,
156 height,
157 0,
158 SkIntToScalar(kPixelsPerTick),
159 fShift,
160 &plotPath,
161 &fillPath);
162
163 // Make the fills partially transparent
164 fillPaint.setColor((colors[i] & 0x00ffffff) | 0x80000000);
165 canvas->drawPath(fillPath, fillPaint);
166
167 plotPaint.setColor(colors[i]);
168 canvas->drawPath(plotPath, plotPaint);
169
170 prevData = fData + i;
171 }
172
173 fShift += kShiftPerFrame;
174 }
175 }
176
177 private:
178 enum {
179 kNumGraphs = 5,
180 kPixelsPerTick = 3,
181 kShiftPerFrame = 1,
182 };
183 int fShift;
184 SkISize fSize;
185 SkTDArray<SkScalar> fData[kNumGraphs];
186 bool fAA;
187
188 typedef Benchmark INHERITED;
189 };
190
191 //////////////////////////////////////////////////////////////////////////////
192
193 DEF_BENCH( return new ChartBench(true); )
194 DEF_BENCH( return new ChartBench(false); )
195