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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "cc/debug/invalidation_benchmark.h"
#include <stdint.h>
#include <algorithm>
#include <limits>
#include "base/rand_util.h"
#include "base/values.h"
#include "cc/layers/layer.h"
#include "cc/layers/picture_layer.h"
#include "cc/trees/layer_tree_host.h"
#include "cc/trees/layer_tree_host_common.h"
#include "ui/gfx/geometry/rect.h"
namespace cc {
namespace {
const char* kDefaultInvalidationMode = "viewport";
} // namespace
InvalidationBenchmark::InvalidationBenchmark(
scoped_ptr<base::Value> value,
const MicroBenchmark::DoneCallback& callback)
: MicroBenchmark(callback), seed_(0) {
base::DictionaryValue* settings = nullptr;
value->GetAsDictionary(&settings);
if (!settings)
return;
std::string mode_string = kDefaultInvalidationMode;
if (settings->HasKey("mode"))
settings->GetString("mode", &mode_string);
if (mode_string == "fixed_size") {
mode_ = FIXED_SIZE;
CHECK(settings->HasKey("width"))
<< "Must provide a width for fixed_size mode.";
CHECK(settings->HasKey("height"))
<< "Must provide a height for fixed_size mode.";
settings->GetInteger("width", &width_);
settings->GetInteger("height", &height_);
} else if (mode_string == "layer") {
mode_ = LAYER;
} else if (mode_string == "random") {
mode_ = RANDOM;
} else if (mode_string == "viewport") {
mode_ = VIEWPORT;
} else {
CHECK(false) << "Invalid mode: " << mode_string
<< ". One of {fixed_size, layer, viewport, random} expected.";
}
}
InvalidationBenchmark::~InvalidationBenchmark() {
}
void InvalidationBenchmark::DidUpdateLayers(LayerTreeHost* host) {
LayerTreeHostCommon::CallFunctionForSubtree(
host->root_layer(),
[this](Layer* layer) { layer->RunMicroBenchmark(this); });
}
void InvalidationBenchmark::RunOnLayer(PictureLayer* layer) {
switch (mode_) {
case FIXED_SIZE: {
// Invalidation with a random position and fixed size.
gfx::Rect visible_layer_rect = layer->visible_layer_rect();
int x = LCGRandom() * (visible_layer_rect.width() - width_);
int y = LCGRandom() * (visible_layer_rect.height() - height_);
gfx::Rect invalidation_rect(x, y, width_, height_);
layer->SetNeedsDisplayRect(invalidation_rect);
break;
}
case LAYER: {
// Invalidate entire layer.
layer->SetNeedsDisplay();
break;
}
case RANDOM: {
// Random invalidation inside the viewport.
gfx::Rect visible_layer_rect = layer->visible_layer_rect();
int x_min = LCGRandom() * visible_layer_rect.width();
int x_max = LCGRandom() * visible_layer_rect.width();
int y_min = LCGRandom() * visible_layer_rect.height();
int y_max = LCGRandom() * visible_layer_rect.height();
if (x_min > x_max)
std::swap(x_min, x_max);
if (y_min > y_max)
std::swap(y_min, y_max);
gfx::Rect invalidation_rect(x_min, y_min, x_max - x_min, y_max - y_min);
layer->SetNeedsDisplayRect(invalidation_rect);
break;
}
case VIEWPORT: {
// Invalidate entire viewport.
layer->SetNeedsDisplayRect(layer->visible_layer_rect());
break;
}
}
}
bool InvalidationBenchmark::ProcessMessage(scoped_ptr<base::Value> value) {
base::DictionaryValue* message = nullptr;
value->GetAsDictionary(&message);
if (!message)
return false;
bool notify_done;
if (message->HasKey("notify_done")) {
message->GetBoolean("notify_done", ¬ify_done);
if (notify_done)
NotifyDone(base::Value::CreateNullValue());
return true;
}
return false;
}
// A simple linear congruential generator. The random numbers don't need to be
// high quality, but they need to be identical in each run. Therefore, we use a
// LCG and keep the state locally in the benchmark.
float InvalidationBenchmark::LCGRandom() {
const uint32_t a = 1664525;
const uint32_t c = 1013904223;
seed_ = a * seed_ + c;
return static_cast<float>(seed_) / std::numeric_limits<uint32_t>::max();
}
} // namespace cc
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