1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
|
/*
* 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 "SkBenchmark.h"
#include "SkCanvas.h"
#include "SkPaint.h"
#include "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, SkTDArray<SkScalar>* dataPts) {
dataPts->setCount(count);
static SkRandom gRandom;
for (int i = 0; i < count; ++i) {
(*dataPts)[i] = gRandom.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 == NULL.
// The plots are animated by rotating the data points by leftShift.
static void gen_paths(const SkTDArray<SkScalar>& topData,
const SkTDArray<SkScalar>* bottomData,
SkScalar yBase,
SkScalar xLeft, SkScalar xDelta,
int leftShift,
SkPath* plot, SkPath* fill) {
plot->rewind();
fill->rewind();
plot->incReserve(topData.count());
if (NULL == 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 (NULL != 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 SkBenchmark {
public:
ChartBench(bool aa) {
fShift = 0;
fAA = aa;
fSize.fWidth = -1;
fSize.fHeight = -1;
}
protected:
virtual const char* onGetName() SK_OVERRIDE {
if (fAA) {
return "chart_aa";
} else {
return "chart_bw";
}
}
virtual void onDraw(const int loops, SkCanvas* canvas) SK_OVERRIDE {
bool sizeChanged = false;
if (canvas->getDeviceSize() != fSize) {
fSize = canvas->getDeviceSize();
sizeChanged = true;
}
SkScalar ySpread = SkIntToScalar(fSize.fHeight / 20);
SkScalar height = SkIntToScalar(fSize.fHeight);
if (sizeChanged) {
int dataPointCount = SkMax32(fSize.fWidth / kPixelsPerTick + 1, 2);
for (int i = 0; i < kNumGraphs; ++i) {
SkScalar y = (kNumGraphs - i) * (height - ySpread) / (kNumGraphs + 1);
fData[i].reset();
gen_data(y, ySpread, dataPointCount, fData + i);
}
}
for (int frame = 0; frame < loops; ++frame) {
canvas->clear(0xFFE0F0E0);
static SkRandom colorRand;
static SkColor gColors[kNumGraphs] = { 0x0 };
if (0 == gColors[0]) {
for (int i = 0; i < kNumGraphs; ++i) {
gColors[i] = colorRand.nextU() | 0xff000000;
}
}
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<SkScalar>* prevData = NULL;
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((gColors[i] & 0x00ffffff) | 0x80000000);
canvas->drawPath(fillPath, fillPaint);
plotPaint.setColor(gColors[i]);
canvas->drawPath(plotPath, plotPaint);
prevData = fData + i;
}
fShift += kShiftPerFrame;
}
}
private:
enum {
kNumGraphs = 5,
kPixelsPerTick = 3,
kShiftPerFrame = 1,
};
int fShift;
SkISize fSize;
SkTDArray<SkScalar> fData[kNumGraphs];
bool fAA;
typedef SkBenchmark INHERITED;
};
//////////////////////////////////////////////////////////////////////////////
DEF_BENCH( return new ChartBench(true); )
DEF_BENCH( return new ChartBench(false); )
|
