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// Copyright 2019 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/ozone/platform/wayland/host/wayland_shm.h"
#include "base/logging.h"
#include "ui/ozone/platform/wayland/host/wayland_buffer_factory.h"
#include "ui/ozone/platform/wayland/host/wayland_connection.h"
namespace ui {
namespace {
constexpr uint32_t kMinVersion = 1;
} // namespace
// static
constexpr char WaylandShm::kInterfaceName[];
// static
void WaylandShm::Instantiate(WaylandConnection* connection,
wl_registry* registry,
uint32_t name,
const std::string& interface,
uint32_t version) {
CHECK_EQ(interface, kInterfaceName) << "Expected \"" << kInterfaceName
<< "\" but got \"" << interface << "\"";
auto* buffer_factory = connection->buffer_factory();
if (buffer_factory->wayland_shm_ ||
!wl::CanBind(interface, version, kMinVersion, kMinVersion)) {
return;
}
auto shm = wl::Bind<wl_shm>(registry, name, kMinVersion);
if (!shm) {
LOG(ERROR) << "Failed to bind to wl_shm global";
return;
}
buffer_factory->wayland_shm_ =
std::make_unique<WaylandShm>(shm.release(), connection);
}
WaylandShm::WaylandShm(wl_shm* shm, WaylandConnection* connection)
: shm_(shm), connection_(connection) {}
WaylandShm::~WaylandShm() = default;
wl::Object<wl_buffer> WaylandShm::CreateBuffer(const base::ScopedFD& fd,
size_t length,
const gfx::Size& size,
bool with_alpha_channel) {
if (!fd.is_valid() || length == 0 || size.IsEmpty())
return wl::Object<wl_buffer>(nullptr);
wl::Object<wl_shm_pool> pool(
wl_shm_create_pool(shm_.get(), fd.get(), length));
if (!pool)
return wl::Object<wl_buffer>(nullptr);
const uint32_t format =
with_alpha_channel ? WL_SHM_FORMAT_ARGB8888 : WL_SHM_FORMAT_XRGB8888;
wl::Object<wl_buffer> shm_buffer(wl_shm_pool_create_buffer(
pool.get(), 0, size.width(), size.height(), size.width() * 4, format));
connection_->Flush();
return shm_buffer;
}
} // namespace ui
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