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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "content/browser/renderer_host/navigation_transitions/navigation_transition_config.h"
#include "base/android/jni_callback.h"
#include "base/auto_reset.h"
#include "base/system/sys_info.h"
#include "base/time/time.h"
#include "base/types/pass_key.h"
#include "content/public/common/content_features.h"
#include "third_party/blink/public/common/features.h"
#include "ui/display/screen.h"
namespace content {
namespace {
const int kMaxScreenshotCount = 20;
static int g_min_required_physical_ram_mb = 7200;
const double kPercentageOfRamToUse = 0.5;
const base::TimeDelta kInvisibleCacheCleanupDelay = base::Minutes(7);
// SendResult is an expensive operation and the start of a navigation is a busy
// time. Delaying SendResult reduces chances of contention.
// The value can be based on human reaction times and LCP latencies and it can
// be adjusted based on the incidence of the value SentScreenshotRequest in
// Navigation.GestureTransition.CacheHitOrMissReason.
const base::TimeDelta kScreenshotSendResultDelay = base::Milliseconds(400);
size_t GetMaxCacheSizeInBytes() {
constexpr int kLowEndMax = 32 * 1024 * 1024; // 32MB
constexpr int kOtherMax = 128 * 1024 * 1024; // 128MB
return base::SysInfo::IsLowEndDevice() ? kLowEndMax : kOtherMax;
}
} // namespace
// static
bool NavigationTransitionConfig::SupportsBackForwardTransitions(
base::PassKey<ContentBrowserClient>) {
return base::SysInfo::AmountOfPhysicalMemory().InMiB() >=
g_min_required_physical_ram_mb;
}
// static
size_t NavigationTransitionConfig::ComputeCacheSizeInBytes() {
// TODO(crbug.com/429140103): Convert the return type to ByteCount.
// Assume 4 bytes per pixel. This value estimates the max number of bytes of
// the physical screen's uncompressed bitmap.
// Assume one pixel for unit tests that don't have or need a screen.
size_t display_size_in_bytes = 4;
if (auto* screen = display::Screen::Get(); screen) {
for (const auto& display : display::Screen::Get()->GetAllDisplays()) {
display_size_in_bytes =
std::max(display_size_in_bytes,
static_cast<size_t>(4 * display.GetSizeInPixel().Area64()));
}
}
size_t memory_required_for_max_screenshots =
display_size_in_bytes * kMaxScreenshotCount;
size_t physical_memory_budget =
(base::SysInfo::AmountOfPhysicalMemory().InBytes() *
kPercentageOfRamToUse) /
100;
physical_memory_budget =
std::min(physical_memory_budget, GetMaxCacheSizeInBytes());
physical_memory_budget =
std::min(physical_memory_budget, memory_required_for_max_screenshots);
// We should at least be able to cache one uncompressed screenshot.
physical_memory_budget =
std::max(display_size_in_bytes, physical_memory_budget);
return physical_memory_budget;
}
// static
base::TimeDelta
NavigationTransitionConfig::GetCleanupDelayForInvisibleCaches() {
return kInvisibleCacheCleanupDelay;
}
// static
base::TimeDelta NavigationTransitionConfig::ScreenshotSendResultDelay() {
return kScreenshotSendResultDelay;
}
// static
base::AutoReset<int>
NavigationTransitionConfig::SetMinRequiredPhysicalRamMbForTesting(int mb) {
return base::AutoReset<int>(&g_min_required_physical_ram_mb, mb);
}
} // namespace content
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