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// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/gfx/x/visual_manager.h"
#include <bitset>
#include "base/strings/string_number_conversions.h"
#include "ui/gfx/x/atom_cache.h"
#include "ui/gfx/x/event.h"
#include "ui/gfx/x/visual_picker_glx.h"
#include "ui/gfx/x/xfixes.h"
namespace x11 {
VisualManager::VisualManager(Connection* connection) : connection_(connection) {
auto atom_name =
"_NET_WM_CM_S" + base::NumberToString(connection_->DefaultScreenId());
compositor_atom_ = GetAtom(atom_name.c_str());
auto& xfixes = connection_->xfixes();
if (xfixes.present()) {
auto mask = x11::XFixes::SelectionEventMask::SetSelectionOwner |
x11::XFixes::SelectionEventMask::SelectionWindowDestroy |
x11::XFixes::SelectionEventMask::SelectionClientClose;
xfixes.SelectSelectionInput(connection_->default_root(), compositor_atom_,
mask);
connection_->AddEventObserver(this);
}
if (auto response = connection_->GetSelectionOwner(compositor_atom_).Sync()) {
compositor_owner_ = response->owner;
}
for (const auto& depth : connection_->default_screen().allowed_depths) {
for (const auto& visual : depth.visuals) {
visuals_[visual.visual_id] =
std::make_unique<XVisualData>(connection_, depth.depth, &visual);
}
}
ColorMap colormap;
PickBestVisuals(connection, opaque_visual_id_, transparent_visual_id_);
// Choose the opaque visual.
if (opaque_visual_id_ == VisualId{}) {
opaque_visual_id_ = connection->default_screen().root_visual;
}
// opaque_visual_id_ may be unset in headless environments
if (opaque_visual_id_ != VisualId{}) {
DCHECK(visuals_.find(opaque_visual_id_) != visuals_.end());
ChooseVisualForWindow(false, nullptr, nullptr, &colormap, nullptr);
}
// Choose the transparent visual.
if (transparent_visual_id_ == VisualId{}) {
for (const auto& pair : visuals_) {
// Why support only 8888 ARGB? Because it's all that GTK supports. In
// gdkvisual-x11.cc, they look for this specific visual and use it for
// all their alpha channel using needs.
const auto& data = *pair.second;
if (data.depth == 32 && data.info->red_mask == 0xff0000 &&
data.info->green_mask == 0x00ff00 &&
data.info->blue_mask == 0x0000ff) {
transparent_visual_id_ = pair.first;
break;
}
}
}
if (transparent_visual_id_ != VisualId{}) {
DCHECK(visuals_.find(transparent_visual_id_) != visuals_.end());
ChooseVisualForWindow(true, nullptr, nullptr, &colormap, nullptr);
}
}
VisualManager::~VisualManager() {
auto& xfixes = connection_->xfixes();
if (xfixes.present()) {
xfixes.SelectSelectionInput(connection_->default_root(), compositor_atom_);
connection_->RemoveEventObserver(this);
}
}
void VisualManager::ChooseVisualForWindow(bool want_argb_visual,
VisualId* visual_id,
uint8_t* depth,
ColorMap* colormap,
bool* visual_has_alpha) {
bool use_argb = want_argb_visual && ArgbVisualAvailable();
VisualId visual = use_argb ? transparent_visual_id_ : opaque_visual_id_;
if (visual_id) {
*visual_id = visual;
}
bool success = GetVisualInfo(visual, depth, colormap, visual_has_alpha);
DCHECK(success);
}
bool VisualManager::GetVisualInfo(VisualId visual_id,
uint8_t* depth,
ColorMap* colormap,
bool* visual_has_alpha) {
DCHECK_NE(visual_id, VisualId{});
auto it = visuals_.find(visual_id);
if (it == visuals_.end()) {
return false;
}
XVisualData& data = *it->second;
const VisualType& info = *data.info;
if (depth) {
*depth = data.depth;
}
if (colormap) {
bool is_default_visual =
visual_id == connection_->default_root_visual().visual_id;
*colormap = is_default_visual ? ColorMap{} : data.GetColormap(connection_);
}
if (visual_has_alpha) {
auto popcount = [](auto x) {
return std::bitset<8 * sizeof(decltype(x))>(x).count();
};
*visual_has_alpha = popcount(info.red_mask) + popcount(info.green_mask) +
popcount(info.blue_mask) <
static_cast<std::size_t>(data.depth);
}
return true;
}
bool VisualManager::ArgbVisualAvailable() const {
return compositor_owner_ != x11::Window::None &&
transparent_visual_id_ != VisualId{};
}
VisualManager::XVisualData::XVisualData(Connection* connection,
uint8_t depth,
const VisualType* info)
: depth(depth), info(info) {}
// Do not free the colormap as this would uninstall the colormap even for
// non-Chromium clients.
VisualManager::XVisualData::~XVisualData() = default;
ColorMap VisualManager::XVisualData::GetColormap(Connection* connection) {
if (colormap_ == ColorMap{}) {
colormap_ = connection->GenerateId<ColorMap>();
connection->CreateColormap({ColormapAlloc::None, colormap_,
connection->default_root(), info->visual_id});
// In single-process mode, VisualManager may be used on multiple threads,
// so we need to flush colormap creation early so that other threads are
// able to use it.
connection->Flush();
}
return colormap_;
}
void VisualManager::OnEvent(const x11::Event& event) {
if (auto* selection_notify = event.As<x11::XFixes::SelectionNotifyEvent>()) {
if (selection_notify->selection == compositor_atom_) {
compositor_owner_ = selection_notify->owner;
}
}
}
} // namespace x11
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