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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 "components/exo/wayland/wl_shm.h"
#include <wayland-server-protocol-core.h>
#include <algorithm>
#include "base/functional/bind.h"
#include "components/exo/buffer.h"
#include "components/exo/display.h"
#include "components/exo/shared_memory.h"
#include "components/exo/wayland/server_util.h"
namespace exo {
namespace wayland {
namespace {
void buffer_destroy(wl_client* client, wl_resource* resource) {
wl_resource_destroy(resource);
}
const struct wl_buffer_interface buffer_implementation = {buffer_destroy};
void HandleBufferReleaseCallback(wl_resource* resource) {
wl_buffer_send_release(resource);
wl_client_flush(wl_resource_get_client(resource));
}
const struct shm_supported_format {
uint32_t shm_format;
gfx::BufferFormat buffer_format;
} shm_supported_formats[] = {
{WL_SHM_FORMAT_XBGR8888, gfx::BufferFormat::RGBX_8888},
{WL_SHM_FORMAT_ABGR8888, gfx::BufferFormat::RGBA_8888},
{WL_SHM_FORMAT_XRGB8888, gfx::BufferFormat::BGRX_8888},
{WL_SHM_FORMAT_ARGB8888, gfx::BufferFormat::BGRA_8888}};
void shm_pool_create_buffer(wl_client* client,
wl_resource* resource,
uint32_t id,
int32_t offset,
int32_t width,
int32_t height,
int32_t stride,
uint32_t format) {
const auto* supported_format = std::ranges::find(
shm_supported_formats, format, &shm_supported_format::shm_format);
if (supported_format == std::end(shm_supported_formats)) {
wl_resource_post_error(resource, WL_SHM_ERROR_INVALID_FORMAT,
"invalid format 0x%x", format);
return;
}
if (offset < 0) {
wl_resource_post_error(resource, WL_SHM_ERROR_INVALID_FORMAT,
"invalid offset %d", offset);
return;
}
std::unique_ptr<Buffer> buffer =
GetUserDataAs<SharedMemory>(resource)->CreateBuffer(
gfx::Size(width, height), supported_format->buffer_format, offset,
stride);
if (!buffer) {
wl_resource_post_no_memory(resource);
return;
}
wl_resource* buffer_resource =
wl_resource_create(client, &wl_buffer_interface, 1, id);
buffer->set_release_callback(base::BindRepeating(
&HandleBufferReleaseCallback, base::Unretained(buffer_resource)));
SetImplementation(buffer_resource, &buffer_implementation, std::move(buffer));
}
void shm_pool_destroy(wl_client* client, wl_resource* resource) {
wl_resource_destroy(resource);
}
void shm_pool_resize(wl_client* client, wl_resource* resource, int32_t size) {
auto* shm = GetUserDataAs<SharedMemory>(resource);
if (size < 0 || static_cast<size_t>(size) < shm->GetSize()) {
wl_resource_post_error(resource, WL_SHM_ERROR_INVALID_FD,
"Can't shrink a shm pool.");
}
if (!shm->Resize(size))
wl_resource_post_no_memory(resource);
}
const struct wl_shm_pool_interface shm_pool_implementation = {
shm_pool_create_buffer, shm_pool_destroy, shm_pool_resize};
void shm_create_pool(wl_client* client,
wl_resource* resource,
uint32_t id,
int fd,
int32_t size) {
static const auto kMode =
base::subtle::PlatformSharedMemoryRegion::Mode::kUnsafe;
auto fd_pair = base::subtle::ScopedFDPair(base::ScopedFD(fd),
base::ScopedFD() /* readonly_fd */);
auto guid = base::UnguessableToken::Create();
auto platform_shared_memory = base::subtle::PlatformSharedMemoryRegion::Take(
std::move(fd_pair), kMode, size, guid);
std::unique_ptr<SharedMemory> shared_memory =
GetUserDataAs<Display>(resource)->CreateSharedMemory(
base::UnsafeSharedMemoryRegion::Deserialize(
std::move(platform_shared_memory)));
if (!shared_memory) {
wl_resource_post_no_memory(resource);
return;
}
wl_resource* shm_pool_resource =
wl_resource_create(client, &wl_shm_pool_interface, 1, id);
SetImplementation(shm_pool_resource, &shm_pool_implementation,
std::move(shared_memory));
}
const struct wl_shm_interface shm_implementation = {shm_create_pool};
} // namespace
void bind_shm(wl_client* client, void* data, uint32_t version, uint32_t id) {
wl_resource* resource = wl_resource_create(client, &wl_shm_interface, 1, id);
wl_resource_set_implementation(resource, &shm_implementation, data, nullptr);
for (const auto& supported_format : shm_supported_formats)
wl_shm_send_format(resource, supported_format.shm_format);
}
} // namespace wayland
} // namespace exo
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