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;
interruptPaint.setShader(make_shader());
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).
rtc->setNeedsStencil();
}
for (int i = 0; i < loops; i++) {
canvas->save();
switch(fType) {
case kPartial_ClearType:
canvas->clipRect(kPartialClip);
break;
case kComplex_ClearType:
canvas->clipRRect(kComplexClip);
break;
case kFull_ClearType:
// Don't add any extra clipping, since it defaults to the entire "device"
break;
}
// The clear we care about measuring
canvas->clear(SK_ColorBLUE);
canvas->restore();
// 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);
}
}
