1 /*
2 * Copyright 2018 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 // This benchmark attempts to measure the time to do a fullscreen clear, an axis-aligned partial
9 // clear, and a clear restricted to an axis-aligned rounded rect. The fullscreen and axis-aligned
10 // partial clears on the GPU should follow a fast path that maps to backend-specialized clear
11 // operations, whereas the rounded-rect clear cannot be.
12
13 #include "bench/Benchmark.h"
14
15 #include "include/core/SkCanvas.h"
16 #include "include/core/SkPaint.h"
17 #include "include/core/SkRRect.h"
18 #include "include/core/SkRect.h"
19 #include "include/effects/SkGradientShader.h"
20 #include "src/core/SkCanvasPriv.h"
21 #include "src/gpu/v1/SurfaceDrawContext_v1.h"
22
make_shader()23 static sk_sp<SkShader> make_shader() {
24 static const SkPoint kPts[] = {{0, 0}, {10, 10}};
25 static const SkColor kColors[] = {SK_ColorBLUE, SK_ColorWHITE};
26 return SkGradientShader::MakeLinear(kPts, kColors, nullptr, 2, SkTileMode::kClamp);
27 }
28
29 class ClearBench : public Benchmark {
30 public:
31 enum ClearType {
32 kFull_ClearType,
33 kPartial_ClearType,
34 kComplex_ClearType
35 };
36
ClearBench(ClearType type)37 ClearBench(ClearType type) : fType(type) {}
38
39 protected:
onGetName()40 const char* onGetName() override {
41 switch(fType) {
42 case kFull_ClearType:
43 return "Clear-Full";
44 case kPartial_ClearType:
45 return "Clear-Partial";
46 case kComplex_ClearType:
47 return "Clear-Complex";
48 }
49 SkASSERT(false);
50 return "Unreachable";
51 }
52
onDraw(int loops,SkCanvas * canvas)53 void onDraw(int loops, SkCanvas* canvas) override {
54 static const SkRect kPartialClip = SkRect::MakeLTRB(50, 50, 400, 400);
55 static const SkRRect kComplexClip = SkRRect::MakeRectXY(kPartialClip, 15, 15);
56 // Small to limit fill cost, but intersects the clips to confound batching
57 static const SkRect kInterruptRect = SkRect::MakeXYWH(200, 200, 3, 3);
58
59 // For the draw that sits between consecutive clears, use a shader that is simple but
60 // requires local coordinates so that Ganesh does not convert it into a solid color rect,
61 // which could then turn into a scissored-clear behind the scenes.
62 SkPaint interruptPaint;
63 interruptPaint.setShader(make_shader());
64
65 auto sdc = SkCanvasPriv::TopDeviceSurfaceDrawContext(canvas);
66 if (sdc) {
67 // Tell the skgpu::v1::SurfaceDrawContext to not reset its draw op list on a
68 // fullscreen clear.
69 // If we don't do this, fullscreen clear ops would be created and constantly discard the
70 // previous iteration's op so execution would only invoke one actual clear on the GPU
71 // (not what we want to measure).
72 sdc->testingOnly_SetPreserveOpsOnFullClear();
73 }
74
75 for (int i = 0; i < loops; i++) {
76 canvas->save();
77 switch(fType) {
78 case kPartial_ClearType:
79 canvas->clipRect(kPartialClip);
80 break;
81 case kComplex_ClearType:
82 canvas->clipRRect(kComplexClip);
83 break;
84 case kFull_ClearType:
85 // Don't add any extra clipping, since it defaults to the entire "device"
86 break;
87 }
88
89 // The clear we care about measuring
90 canvas->clear(SK_ColorBLUE);
91 canvas->restore();
92
93 // Perform as minimal a draw as possible that intersects with the clear region in
94 // order to prevent the clear ops from being batched together.
95 canvas->drawRect(kInterruptRect, interruptPaint);
96 }
97 }
98
99 private:
100 ClearType fType;
101 };
102
103 DEF_BENCH( return new ClearBench(ClearBench::kFull_ClearType); )
104 DEF_BENCH( return new ClearBench(ClearBench::kPartial_ClearType); )
105 DEF_BENCH( return new ClearBench(ClearBench::kComplex_ClearType); )
106