blob: 952e5ddbd0ca09561d436e42a9f41b40d89af98a [file] [log] [blame]
* Copyright 2018 Google Inc.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
// This benchmark attempts to measure the time to do a fullscreen clear, an axis-aligned partial
// clear, and a clear restricted to an axis-aligned rounded rect. The fullscreen and axis-aligned
// partial clears on the GPU should follow a fast path that maps to backend-specialized clear
// operations, whereas the rounded-rect clear cannot be.
#include "Benchmark.h"
#include "SkCanvas.h"
#include "SkGradientShader.h"
#include "SkPaint.h"
#include "SkRect.h"
#include "SkRRect.h"
#include "GrRenderTargetContext.h"
static sk_sp<SkShader> make_shader() {
static const SkPoint kPts[] = {{0, 0}, {10, 10}};
static const SkColor kColors[] = {SK_ColorBLUE, SK_ColorWHITE};
return SkGradientShader::MakeLinear(kPts, kColors, nullptr, 2, SkShader::kClamp_TileMode);
class ClearBench : public Benchmark {
enum ClearType {
ClearBench(ClearType type) : fType(type) {}
const char* onGetName() override {
switch(fType) {
case kFull_ClearType:
return "Clear-Full";
case kPartial_ClearType:
return "Clear-Partial";
case kComplex_ClearType:
return "Clear-Complex";
return "Unreachable";
void onDraw(int loops, SkCanvas* canvas) override {
static const SkRect kPartialClip = SkRect::MakeLTRB(50, 50, 400, 400);
static const SkRRect kComplexClip = SkRRect::MakeRectXY(kPartialClip, 15, 15);
// Small to limit fill cost, but intersects the clips to confound batching
static const SkRect kInterruptRect = SkRect::MakeXYWH(200, 200, 3, 3);
// For the draw that sits between consecutive clears, use a shader that is simple but
// requires local coordinates so that Ganesh does not convert it into a solid color rect,
// which could then turn into a scissored-clear behind the scenes.
SkPaint interruptPaint;
GrRenderTargetContext* rtc = canvas->internal_private_accessTopLayerRenderTargetContext();
if (rtc) {
// Tricks the GrRenderTargetOpList into thinking it cannot reset its draw op list on
// a fullscreen clear. If we don't do this, fullscreen clear ops would be created and
// constantly discard the previous iteration's op so execution would only invoke one
// actual clear on the GPU (not what we want to measure).
for (int i = 0; i < loops; i++) {
switch(fType) {
case kPartial_ClearType:
case kComplex_ClearType:
case kFull_ClearType:
// Don't add any extra clipping, since it defaults to the entire "device"
// The clear we care about measuring
// Perform as minimal a draw as possible that intersects with the clear region in
// order to prevent the clear ops from being batched together.
canvas->drawRect(kInterruptRect, interruptPaint);
ClearType fType;
DEF_BENCH( return new ClearBench(ClearBench::kFull_ClearType); )
DEF_BENCH( return new ClearBench(ClearBench::kPartial_ClearType); )
DEF_BENCH( return new ClearBench(ClearBench::kComplex_ClearType); )