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/*
* Copyright (c) 2018-2020, the SerenityOS developers.
* Copyright (c) 2022, kleines Filmröllchen <filmroellchen@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include "HardwareScreenBackend.h"
#include "ScreenBackend.h"
#include <AK/Try.h>
#include <Kernel/API/Graphics.h>
#include <LibCore/System.h>
#include <fcntl.h>
#include <stdio.h>
#include <sys/mman.h>
#include <unistd.h>
namespace WindowServer {
HardwareScreenBackend::HardwareScreenBackend(String device)
: m_device(move(device))
{
}
ErrorOr<void> HardwareScreenBackend::open()
{
m_display_connector_fd = TRY(Core::System::open(m_device, O_RDWR | O_CLOEXEC));
GraphicsConnectorProperties properties;
if (graphics_connector_get_properties(m_display_connector_fd, &properties) < 0)
return Error::from_syscall(String::formatted("failed to ioctl {}", m_device), errno);
m_can_device_flush_buffers = (properties.partial_flushing_support != 0);
m_can_device_flush_entire_framebuffer = (properties.flushing_support != 0);
m_can_set_head_buffer = (properties.doublebuffer_support != 0);
return {};
}
HardwareScreenBackend::~HardwareScreenBackend()
{
if (m_display_connector_fd >= 0) {
close(m_display_connector_fd);
m_display_connector_fd = -1;
}
if (m_framebuffer) {
MUST(Core::System::munmap(m_framebuffer, m_size_in_bytes));
m_framebuffer = nullptr;
m_size_in_bytes = 0;
}
}
ErrorOr<void> HardwareScreenBackend::set_head_mode_setting(GraphicsHeadModeSetting mode_setting)
{
GraphicsHeadModeSetting requested_mode_setting = mode_setting;
auto rc = graphics_connector_set_head_mode_setting(m_display_connector_fd, &requested_mode_setting);
if (rc != 0) {
dbgln("Failed to set backend mode setting: falling back to safe resolution");
rc = graphics_connector_set_safe_head_mode_setting(m_display_connector_fd);
if (rc != 0) {
dbgln("Failed to set backend safe mode setting: aborting");
return Error::from_syscall("graphics_connector_set_safe_head_mode_setting"sv, rc);
}
dbgln("Failed to set backend mode setting: falling back to safe resolution - success.");
}
return {};
}
ErrorOr<void> HardwareScreenBackend::unmap_framebuffer()
{
if (m_framebuffer) {
size_t previous_size_in_bytes = m_size_in_bytes;
return Core::System::munmap(m_framebuffer, previous_size_in_bytes);
}
return {};
}
ErrorOr<void> HardwareScreenBackend::map_framebuffer()
{
GraphicsHeadModeSetting mode_setting {};
memset(&mode_setting, 0, sizeof(GraphicsHeadModeSetting));
int rc = graphics_connector_get_head_mode_setting(m_display_connector_fd, &mode_setting);
if (rc != 0) {
return Error::from_syscall("graphics_connector_get_head_mode_setting"sv, rc);
}
m_size_in_bytes = mode_setting.horizontal_stride * mode_setting.vertical_active * 2;
m_framebuffer = (Gfx::ARGB32*)TRY(Core::System::mmap(nullptr, m_size_in_bytes, PROT_READ | PROT_WRITE, MAP_SHARED, m_display_connector_fd, 0));
if (m_can_set_head_buffer) {
// Note: fall back to assuming the second buffer starts right after the last line of the first
// Note: for now, this calculation works quite well, so need to defer it to another function
// that does ioctl to figure out the correct offset. If a Framebuffer device ever happens to
// to set the second buffer at different location than this, we might need to consider bringing
// back a function with ioctl to check this.
m_back_buffer_offset = static_cast<size_t>(mode_setting.horizontal_stride) * mode_setting.vertical_active;
} else {
m_back_buffer_offset = 0;
}
return {};
}
ErrorOr<GraphicsHeadModeSetting> HardwareScreenBackend::get_head_mode_setting()
{
GraphicsHeadModeSetting mode_setting {};
memset(&mode_setting, 0, sizeof(GraphicsHeadModeSetting));
int rc = graphics_connector_get_head_mode_setting(m_display_connector_fd, &mode_setting);
if (rc != 0) {
return Error::from_syscall("graphics_connector_get_head_mode_setting"sv, rc);
}
m_pitch = mode_setting.horizontal_stride;
return mode_setting;
}
void HardwareScreenBackend::set_head_buffer(int head_index)
{
VERIFY(m_can_set_head_buffer);
VERIFY(head_index <= 1 && head_index >= 0);
GraphicsHeadVerticalOffset offset { 0, 0 };
if (head_index == 1)
offset.offsetted = 1;
int rc = fb_set_head_vertical_offset_buffer(m_display_connector_fd, &offset);
VERIFY(rc == 0);
}
ErrorOr<void> HardwareScreenBackend::flush_framebuffer_rects(int buffer_index, Span<FBRect const> flush_rects)
{
int rc = fb_flush_buffers(m_display_connector_fd, buffer_index, flush_rects.data(), (unsigned)flush_rects.size());
if (rc == -ENOTSUP)
m_can_device_flush_buffers = false;
else if (rc != 0)
return Error::from_syscall("fb_flush_buffers"sv, rc);
return {};
}
ErrorOr<void> HardwareScreenBackend::flush_framebuffer()
{
int rc = fb_flush_head(m_display_connector_fd);
if (rc == -ENOTSUP)
m_can_device_flush_entire_framebuffer = false;
else if (rc != 0)
return Error::from_syscall("fb_flush_head"sv, rc);
return {};
}
}
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