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/*
* Copyright (c) 2021, Nicholas Hollett <niax@niax.co.uk>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include "FlameGraphView.h"
#include "DevTools/Profiler/Profile.h"
#include "LibGfx/Forward.h"
#include <AK/Function.h>
#include <LibGUI/Painter.h>
#include <LibGfx/FontDatabase.h>
#include <LibGfx/Palette.h>
namespace Profiler {
constexpr int bar_rounding = 2;
constexpr int bar_margin = 2;
constexpr int bar_padding = 8;
constexpr int bar_height = 20;
constexpr int text_threshold = 30;
Vector<Gfx::Color> s_colors;
static Vector<Gfx::Color> const& get_colors()
{
if (s_colors.is_empty()) {
// Start with a nice orange, then make shades of it
Gfx::Color midpoint(255, 94, 19);
s_colors.extend(midpoint.shades(3, 0.5f));
s_colors.append(midpoint);
s_colors.extend(midpoint.tints(3, 0.5f));
}
return s_colors;
}
FlameGraphView::FlameGraphView(GUI::Model& model, int text_column, int width_column)
: m_model(model)
, m_text_column(text_column)
, m_width_column(width_column)
{
set_fill_with_background_color(true);
set_background_role(Gfx::ColorRole::Base);
m_model.register_client(*this);
m_colors = get_colors();
layout_bars();
}
GUI::ModelIndex const FlameGraphView::hovered_index() const
{
if (!m_hovered_bar)
return GUI::ModelIndex();
return m_hovered_bar->index;
}
void FlameGraphView::model_did_update(unsigned)
{
m_selected_indexes.clear();
layout_bars();
update();
}
void FlameGraphView::mousemove_event(GUI::MouseEvent& event)
{
StackBar* hovered_bar = nullptr;
for (size_t i = 0; i < m_bars.size(); ++i) {
auto& bar = m_bars[i];
if (bar.rect.contains(event.x(), event.y())) {
hovered_bar = &bar;
break;
}
}
if (m_hovered_bar == hovered_bar)
return;
m_hovered_bar = hovered_bar;
if (on_hover_change)
on_hover_change();
update();
}
void FlameGraphView::mousedown_event(GUI::MouseEvent& event)
{
if (event.button() != GUI::MouseButton::Primary)
return;
if (!m_hovered_bar)
return;
m_selected_indexes.clear();
GUI::ModelIndex selected_index = m_hovered_bar->index;
while (selected_index.is_valid()) {
m_selected_indexes.append(selected_index);
selected_index = selected_index.parent();
}
layout_bars();
update();
}
void FlameGraphView::resize_event(GUI::ResizeEvent&)
{
layout_bars();
}
void FlameGraphView::paint_event(GUI::PaintEvent& event)
{
GUI::Painter painter(*this);
painter.add_clip_rect(event.rect());
for (const auto& bar : m_bars) {
auto label_index = bar.index.sibling_at_column(m_text_column);
String label = "All";
if (label_index.is_valid()) {
label = m_model.data(label_index).to_string();
}
auto color = m_colors[label.hash() % m_colors.size()];
if (&bar == m_hovered_bar)
color = color.lightened(1.2f);
if (bar.selected)
color = color.with_alpha(128);
// Do rounded corners if the node will draw with enough width
if (bar.rect.width() > (bar_rounding * 3))
painter.fill_rect_with_rounded_corners(bar.rect.shrunken(0, bar_margin), color, bar_rounding);
else
painter.fill_rect(bar.rect.shrunken(0, bar_margin), color);
if (bar.rect.width() > text_threshold) {
painter.draw_text(
bar.rect.shrunken(bar_padding, 0),
label,
painter.font(),
Gfx::TextAlignment::CenterLeft,
Gfx::Color::Black,
Gfx::TextElision::Right);
}
}
}
void FlameGraphView::layout_bars()
{
m_bars.clear();
// Explicit copy here so the layout can mutate
Vector<GUI::ModelIndex> selected = m_selected_indexes;
GUI::ModelIndex null_index;
layout_children(null_index, 0, 0, this->width(), selected);
}
void FlameGraphView::layout_children(GUI::ModelIndex& index, int depth, int left, int right, Vector<GUI::ModelIndex>& selected_nodes)
{
auto available_width = right - left;
if (available_width < 1)
return;
auto y = this->height() - (bar_height * depth) - bar_height;
if (y < 0)
return;
u32 node_event_count = 0;
if (!index.is_valid()) {
// We're at the root, so calculate the event count across all roots
for (auto i = 0; i < m_model.row_count(index); ++i) {
auto& root = *static_cast<ProfileNode*>(m_model.index(i).internal_data());
node_event_count += root.event_count();
}
m_bars.append({ {}, { left, y, available_width, bar_height }, false });
} else {
auto node = static_cast<ProfileNode*>(index.internal_data());
bool selected = !selected_nodes.is_empty();
if (selected) {
VERIFY(selected_nodes.take_last() == index);
}
node_event_count = node->event_count();
Gfx::IntRect node_rect { left, y, available_width, bar_height };
m_bars.append({ index, node_rect, selected });
}
float width_per_sample = static_cast<float>(available_width) / node_event_count;
float new_left = static_cast<float>(left);
for (auto i = 0; i < m_model.row_count(index); ++i) {
auto child_index = m_model.index(i, 0, index);
if (!child_index.is_valid())
continue;
if (!selected_nodes.is_empty()) {
if (selected_nodes.last() != child_index)
continue;
layout_children(child_index, depth + 1, left, right, selected_nodes);
return;
}
auto child = static_cast<ProfileNode*>(child_index.internal_data());
float child_width = width_per_sample * child->event_count();
layout_children(child_index, depth + 1, static_cast<int>(new_left), static_cast<int>(new_left + child_width), selected_nodes);
new_left += child_width;
}
}
}
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