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cpu_graph_page_view.cc
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cpu_graph_page_view.cc
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// Copyright 2020 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 "ash/hud_display/cpu_graph_page_view.h"
#include <algorithm>
#include <numeric>
#include "ash/hud_display/hud_constants.h"
#include "base/strings/stringprintf.h"
#include "base/strings/utf_string_conversions.h"
#include "ui/gfx/canvas.h"
#include "ui/views/metadata/metadata_impl_macros.h"
namespace ash {
namespace hud_display {
////////////////////////////////////////////////////////////////////////////////
// CpuGraphPageView, public:
BEGIN_METADATA(CpuGraphPageView, GraphPageViewBase)
END_METADATA
CpuGraphPageView::CpuGraphPageView(const base::TimeDelta refresh_interval)
: cpu_other_(kDefaultGraphWidth,
Graph::Baseline::BASELINE_BOTTOM,
Graph::Fill::SOLID,
Graph::Style::LINES,
SkColorSetA(SK_ColorMAGENTA, kHUDAlpha)),
cpu_system_(kDefaultGraphWidth,
Graph::Baseline::BASELINE_BOTTOM,
Graph::Fill::SOLID,
Graph::Style::LINES,
SkColorSetA(SK_ColorRED, kHUDAlpha)),
cpu_user_(kDefaultGraphWidth,
Graph::Baseline::BASELINE_BOTTOM,
Graph::Fill::SOLID,
Graph::Style::LINES,
SkColorSetA(SK_ColorBLUE, kHUDAlpha)),
cpu_idle_(kDefaultGraphWidth,
Graph::Baseline::BASELINE_BOTTOM,
Graph::Fill::SOLID,
Graph::Style::LINES,
SkColorSetA(SK_ColorDKGRAY, kHUDAlpha)) {
const int data_width = cpu_other_.max_data_points();
// Verical ticks are drawn every 10% (10/100 interval).
constexpr float vertical_ticks_interval = (10 / 100.0);
// -XX seconds on the left, 100% top, 0 seconds on the right, 0% on the
// bottom. Seconds and Gigabytes are dimensions. Number of data points is
// cpu_other_.GetDataBufferSize(), horizontal grid ticks are drawn every 10
// seconds.
CreateGrid(
/*left=*/static_cast<int>(-data_width * refresh_interval.InSecondsF()),
/*top=*/100, /*right=*/0, /*bottom=*/0,
/*x_unit=*/base::ASCIIToUTF16("s"),
/*y_unit=*/base::ASCIIToUTF16("%"),
/*horizontal_points_number=*/data_width,
/*horizontal_ticks_interval=*/10 / refresh_interval.InSecondsF(),
vertical_ticks_interval);
Legend::Formatter formatter = base::BindRepeating([](float value) {
return base::ASCIIToUTF16(base::StringPrintf(
"%d %%", std::min(100, std::max(0, (int)(value * 100)))));
});
const std::vector<Legend::Entry> legend(
{{cpu_idle_, base::ASCIIToUTF16("Idle"),
base::ASCIIToUTF16("Total amount of CPU time spent\nin idle mode."),
formatter},
{cpu_user_, base::ASCIIToUTF16("User"),
base::ASCIIToUTF16(
"Total amount of CPU time spent\n running user processes."),
formatter},
{cpu_system_, base::ASCIIToUTF16("System"),
base::ASCIIToUTF16(
"Total amount of CPU time spent\nrunning system processes."),
formatter},
{cpu_other_, base::ASCIIToUTF16("Other"),
base::ASCIIToUTF16(
"Total amount of CPU time spent\nrunning other tasks.\nThis "
"includes IO wait, IRQ, guest OS, etc."),
formatter}});
CreateLegend(legend);
}
CpuGraphPageView::~CpuGraphPageView() = default;
////////////////////////////////////////////////////////////////////////////////
void CpuGraphPageView::OnPaint(gfx::Canvas* canvas) {
// TODO: Should probably update last graph point more often than shift graph.
// Layout graphs.
gfx::Rect rect = GetContentsBounds();
// Adjust to grid width.
rect.Inset(kGridLineWidth, kGridLineWidth);
cpu_other_.Layout(rect, nullptr /* base*/);
cpu_system_.Layout(rect, &cpu_other_);
cpu_user_.Layout(rect, &cpu_system_);
cpu_idle_.Layout(rect, &cpu_user_);
// Paint damaged area now that all parameters have been determined.
cpu_other_.Draw(canvas);
cpu_system_.Draw(canvas);
cpu_user_.Draw(canvas);
cpu_idle_.Draw(canvas);
}
void CpuGraphPageView::UpdateData(const DataSource::Snapshot& snapshot) {
// TODO: Should probably update last graph point more often than shift graph.
const float total = snapshot.cpu_idle_part + snapshot.cpu_user_part +
snapshot.cpu_system_part + snapshot.cpu_other_part;
// Nothing to do if data is not available yet (sum < 1%).
if (total < 0.01)
return;
// Assume total already equals 1, no need to re-weight.
// Update graph data.
// unscaled values for CPU are the same. Formatter will display it as %.
cpu_other_.AddValue(snapshot.cpu_other_part, snapshot.cpu_other_part);
cpu_system_.AddValue(snapshot.cpu_system_part, snapshot.cpu_system_part);
cpu_user_.AddValue(snapshot.cpu_user_part, snapshot.cpu_user_part);
cpu_idle_.AddValue(snapshot.cpu_idle_part, snapshot.cpu_idle_part);
RefreshLegendValues();
}
} // namespace hud_display
} // namespace ash