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// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "cc/benchmarks/invalidation_benchmark.h"
#include <stdint.h>
#include <algorithm>
#include <limits>
#include <optional>
#include <string>
#include <utility>
#include "base/notreached.h"
#include "base/rand_util.h"
#include "base/values.h"
#include "cc/base/math_util.h"
#include "cc/layers/layer.h"
#include "cc/layers/picture_layer.h"
#include "cc/trees/draw_property_utils.h"
#include "cc/trees/layer_tree_host.h"
#include "ui/gfx/geometry/rect.h"
namespace cc {
namespace {
const char* kDefaultInvalidationMode = "viewport";
} // namespace
InvalidationBenchmark::InvalidationBenchmark(
base::Value::Dict settings,
MicroBenchmark::DoneCallback callback)
: MicroBenchmark(std::move(callback)) {
std::string mode_string = kDefaultInvalidationMode;
auto* mode_string_from_settings = settings.FindString("mode");
if (mode_string_from_settings)
mode_string = *mode_string_from_settings;
if (mode_string == "fixed_size") {
mode_ = FIXED_SIZE;
auto width = settings.FindInt("width");
auto height = settings.FindInt("height");
CHECK(width.has_value()) << "Must provide a width for fixed_size mode.";
CHECK(height.has_value()) << "Must provide a height for fixed_size mode.";
width_ = *width;
height_ = *height;
} else if (mode_string == "layer") {
mode_ = LAYER;
} else if (mode_string == "random") {
mode_ = RANDOM;
} else if (mode_string == "viewport") {
mode_ = VIEWPORT;
} else {
NOTREACHED() << "Invalid mode: " << mode_string
<< ". One of {fixed_size, layer, viewport, random} expected.";
}
}
InvalidationBenchmark::~InvalidationBenchmark() = default;
void InvalidationBenchmark::DidUpdateLayers(LayerTreeHost* layer_tree_host) {
for (auto* layer : *layer_tree_host)
layer->RunMicroBenchmark(this);
}
void InvalidationBenchmark::RunOnLayer(PictureLayer* layer) {
gfx::Rect visible_layer_rect = gfx::Rect(layer->bounds());
gfx::Transform from_screen =
layer->ScreenSpaceTransform().InverseOrIdentity();
gfx::Rect viewport_rect = MathUtil::ProjectEnclosingClippedRect(
from_screen, layer->layer_tree_host()->device_viewport_rect());
visible_layer_rect.Intersect(viewport_rect);
switch (mode_) {
case FIXED_SIZE: {
// Invalidation with a random position and fixed size.
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.
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(visible_layer_rect);
break;
}
}
}
bool InvalidationBenchmark::ProcessMessage(base::Value::Dict message) {
auto notify_done = message.FindBool("notify_done");
if (notify_done.has_value()) {
if (notify_done.value()) {
NotifyDone(base::Value::Dict());
}
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() {
constexpr uint32_t a = 1664525;
constexpr uint32_t c = 1013904223;
seed_ = a * seed_ + c;
return static_cast<float>(seed_) /
static_cast<float>(std::numeric_limits<uint32_t>::max());
}
} // namespace cc
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