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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 "ui/ozone/platform/wayland/gpu/gl_surface_egl_readback_wayland.h"
#include "base/memory/shared_memory_mapping.h"
#include "base/memory/unsafe_shared_memory_region.h"
#include "base/numerics/checked_math.h"
#include "ui/ozone/platform/wayland/gpu/wayland_buffer_manager_gpu.h"
namespace ui {
namespace {
constexpr size_t kMaxBuffers = 2;
constexpr size_t kBytesPerPixelBGRA = 4;
} // namespace
GLSurfaceEglReadbackWayland::PixelBuffer::PixelBuffer(
base::WritableSharedMemoryMapping shm_mapping,
uint32_t buffer_id)
: shm_mapping_(std::move(shm_mapping)), buffer_id_(buffer_id) {}
GLSurfaceEglReadbackWayland::PixelBuffer::~PixelBuffer() = default;
GLSurfaceEglReadbackWayland::GLSurfaceEglReadbackWayland(
gfx::AcceleratedWidget widget,
WaylandBufferManagerGpu* buffer_manager)
: PbufferGLSurfaceEGL(gfx::Size(1, 1)),
widget_(widget),
buffer_manager_(buffer_manager) {
buffer_manager_->RegisterSurface(widget_, this);
}
void GLSurfaceEglReadbackWayland::Destroy() {
DestroyBuffers();
buffer_manager_->UnregisterSurface(widget_);
PbufferGLSurfaceEGL::Destroy();
}
bool GLSurfaceEglReadbackWayland::Resize(const gfx::Size& size,
float scale_factor,
const gfx::ColorSpace& color_space,
bool has_alpha) {
DestroyBuffers();
pending_frames_ = 0;
if (!PbufferGLSurfaceEGL::Resize(size, scale_factor, color_space, has_alpha))
return false;
for (size_t i = 0; i < kMaxBuffers; ++i) {
base::CheckedNumeric<size_t> checked_length(size.width());
checked_length *= size.height();
checked_length *= kBytesPerPixelBGRA;
if (!checked_length.IsValid())
return false;
base::UnsafeSharedMemoryRegion shm_region =
base::UnsafeSharedMemoryRegion::Create(checked_length.ValueOrDie());
if (!shm_region.IsValid())
return false;
auto shm_mapping = shm_region.Map();
if (!shm_mapping.IsValid())
return false;
base::subtle::PlatformSharedMemoryRegion platform_shm =
base::UnsafeSharedMemoryRegion::TakeHandleForSerialization(
std::move(shm_region));
base::subtle::ScopedFDPair fd_pair = platform_shm.PassPlatformHandle();
auto buffer_id = buffer_manager_->AllocateBufferID();
available_buffers_.push_back(
std::make_unique<PixelBuffer>(std::move(shm_mapping), buffer_id));
buffer_manager_->CreateShmBasedBuffer(
std::move(fd_pair.fd), checked_length.ValueOrDie(), size, buffer_id);
}
return true;
}
bool GLSurfaceEglReadbackWayland::IsOffscreen() {
return false;
}
bool GLSurfaceEglReadbackWayland::SupportsAsyncSwap() {
return true;
}
gfx::SwapResult GLSurfaceEglReadbackWayland::SwapBuffers(
PresentationCallback callback) {
NOTREACHED();
return gfx::SwapResult::SWAP_FAILED;
}
void GLSurfaceEglReadbackWayland::SwapBuffersAsync(
SwapCompletionCallback completion_callback,
PresentationCallback presentation_callback) {
DCHECK(pending_frames_ < kMaxBuffers);
// Increase pending frames number.
++pending_frames_;
completion_callbacks_.push_back(std::move(completion_callback));
presentation_callbacks_.push_back(std::move(presentation_callback));
DCHECK(!available_buffers_.empty());
in_flight_pixel_buffers_.push_back(std::move(available_buffers_.front()));
auto* next_buffer = in_flight_pixel_buffers_.back().get();
available_buffers_.erase(available_buffers_.begin());
const gfx::Size size = GetSize();
CHECK(next_buffer->shm_mapping_.memory());
glReadPixels(0, 0, size.width(), size.height(), GL_BGRA, GL_UNSIGNED_BYTE,
next_buffer->shm_mapping_.memory());
buffer_manager_->CommitBuffer(widget_, next_buffer->buffer_id_,
{{0, 0}, size});
}
gfx::SurfaceOrigin GLSurfaceEglReadbackWayland::GetOrigin() const {
// GLSurfaceEglReadbackWayland's y-axis is flipped compare to GL - (0,0) is at
// top left corner.
return gfx::SurfaceOrigin::kTopLeft;
}
GLSurfaceEglReadbackWayland::~GLSurfaceEglReadbackWayland() {
Destroy();
}
void GLSurfaceEglReadbackWayland::OnSubmission(
uint32_t buffer_id,
const gfx::SwapResult& swap_result) {
--pending_frames_;
if (in_flight_pixel_buffers_.front()) {
if (displayed_buffer_)
available_buffers_.push_back(std::move(displayed_buffer_));
displayed_buffer_ = std::move(in_flight_pixel_buffers_.front());
DCHECK_EQ(displayed_buffer_->buffer_id_, buffer_id);
}
in_flight_pixel_buffers_.pop_front();
DCHECK(!completion_callbacks_.empty());
std::move(completion_callbacks_.front()).Run(swap_result, nullptr);
completion_callbacks_.erase(completion_callbacks_.begin());
}
void GLSurfaceEglReadbackWayland::OnPresentation(
uint32_t buffer_id,
const gfx::PresentationFeedback& feedback) {
DCHECK(!presentation_callbacks_.empty());
std::move(presentation_callbacks_.front()).Run(feedback);
presentation_callbacks_.erase(presentation_callbacks_.begin());
}
void GLSurfaceEglReadbackWayland::DestroyBuffers() {
for (const auto& pixel_buffer : available_buffers_)
buffer_manager_->DestroyBuffer(widget_, pixel_buffer->buffer_id_);
for (const auto& pixel_buffer : in_flight_pixel_buffers_)
buffer_manager_->DestroyBuffer(widget_, pixel_buffer->buffer_id_);
if (displayed_buffer_)
buffer_manager_->DestroyBuffer(widget_, displayed_buffer_->buffer_id_);
available_buffers_.clear();
in_flight_pixel_buffers_.clear();
displayed_buffer_.reset();
}
} // namespace ui
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