1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
|
/*
* 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/FB.h>
#include <LibCore/System.h>
#include <fcntl.h>
#include <stdio.h>
#include <sys/mman.h>
#include <unistd.h>
namespace WindowServer {
HardwareScreenBackend::HardwareScreenBackend(String device, bool display_connector_device_backed)
: m_device(move(device))
, display_connector_device_backed(display_connector_device_backed)
{
}
ErrorOr<void> HardwareScreenBackend::open()
{
m_framebuffer_fd = TRY(Core::System::open(m_device.characters(), O_RDWR | O_CLOEXEC));
FBProperties properties;
if (fb_get_properties(m_framebuffer_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_set_head_buffer = (properties.doublebuffer_support != 0);
return {};
}
HardwareScreenBackend::~HardwareScreenBackend()
{
if (m_framebuffer_fd >= 0) {
close(m_framebuffer_fd);
m_framebuffer_fd = -1;
}
if (m_framebuffer) {
if (!display_connector_device_backed)
MUST(Core::System::munmap(m_framebuffer, m_size_in_bytes));
else
free(m_framebuffer);
m_framebuffer = nullptr;
m_size_in_bytes = 0;
}
}
ErrorOr<void> HardwareScreenBackend::set_head_resolution(FBHeadResolution resolution)
{
if (!display_connector_device_backed) {
auto rc = fb_set_resolution(m_framebuffer_fd, &resolution);
if (rc != 0)
return Error::from_syscall("fb_set_resolution", rc);
} else {
FBHeadModeSetting mode_setting;
memset(&mode_setting, 0, sizeof(FBHeadModeSetting));
mode_setting.horizontal_active = resolution.width;
mode_setting.vertical_active = resolution.height;
mode_setting.horizontal_stride = resolution.pitch;
auto rc = fb_set_head_mode_setting(m_framebuffer_fd, &mode_setting);
if (rc != 0) {
dbgln("Failed to set backend mode setting: falling back to safe resolution");
rc = fb_set_safe_head_mode_setting(m_framebuffer_fd);
if (rc != 0) {
dbgln("Failed to set backend safe mode setting: aborting");
return Error::from_syscall("fb_set_safe_head_mode_setting", rc);
}
dbgln("Failed to set backend mode setting: falling back to safe resolution - success.");
}
}
return {};
}
ErrorOr<void> HardwareScreenBackend::unmap_framebuffer()
{
if (m_framebuffer) {
if (!display_connector_device_backed) {
size_t previous_size_in_bytes = m_size_in_bytes;
return Core::System::munmap(m_framebuffer, previous_size_in_bytes);
} else {
free(m_framebuffer);
}
}
return {};
}
ErrorOr<void> HardwareScreenBackend::write_all_contents(Gfx::IntRect const& virtual_rect)
{
if (!display_connector_device_backed)
return {};
lseek(m_framebuffer_fd, 0, SEEK_SET);
write(m_framebuffer_fd, scanline(0, 0), virtual_rect.height() * m_pitch);
if (m_can_set_head_buffer) {
if (lseek(m_framebuffer_fd, virtual_rect.height() * m_pitch, SEEK_SET) < 0) {
VERIFY_NOT_REACHED();
}
if (write(m_framebuffer_fd, scanline(0, 0), virtual_rect.height() * m_pitch) < 0)
VERIFY_NOT_REACHED();
}
return {};
}
ErrorOr<void> HardwareScreenBackend::map_framebuffer()
{
if (!display_connector_device_backed) {
FBHeadProperties properties;
properties.head_index = 0;
int rc = fb_get_head_properties(m_framebuffer_fd, &properties);
if (rc != 0)
return Error::from_syscall("fb_get_head_properties", rc);
m_size_in_bytes = properties.buffer_length;
m_framebuffer = (Gfx::ARGB32*)TRY(Core::System::mmap(nullptr, m_size_in_bytes, PROT_READ | PROT_WRITE, MAP_SHARED, m_framebuffer_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>(properties.pitch) * properties.height;
} else {
m_back_buffer_offset = 0;
}
} else {
FBHeadModeSetting mode_setting {};
memset(&mode_setting, 0, sizeof(FBHeadModeSetting));
int rc = fb_get_head_mode_setting(m_framebuffer_fd, &mode_setting);
if (rc != 0) {
return Error::from_syscall("fb_get_head_mode_setting", rc);
}
m_size_in_bytes = mode_setting.horizontal_stride * mode_setting.vertical_active * 2;
m_framebuffer = (Gfx::ARGB32*)malloc(m_size_in_bytes);
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<FBHeadProperties> HardwareScreenBackend::get_head_properties()
{
if (!display_connector_device_backed) {
FBHeadProperties properties;
properties.head_index = 0;
int rc = fb_get_head_properties(m_framebuffer_fd, &properties);
if (rc != 0)
return Error::from_syscall("fb_get_head_properties", rc);
m_pitch = static_cast<int>(properties.pitch);
return properties;
} else {
FBHeadModeSetting mode_setting {};
memset(&mode_setting, 0, sizeof(FBHeadModeSetting));
int rc = fb_get_head_mode_setting(m_framebuffer_fd, &mode_setting);
if (rc != 0) {
return Error::from_syscall("fb_get_head_mode_setting", rc);
}
m_pitch = mode_setting.horizontal_stride;
// Note: We translate (for now, until Framebuffer devices are removed) the FBHeadModeSetting
// structure to FBHeadProperties.
FBHeadProperties properties;
properties.head_index = 0;
properties.pitch = mode_setting.horizontal_stride;
properties.width = mode_setting.horizontal_active;
properties.height = mode_setting.vertical_active;
properties.offset = 0;
properties.buffer_length = mode_setting.horizontal_stride * mode_setting.vertical_active * 2;
return properties;
}
VERIFY_NOT_REACHED();
}
void HardwareScreenBackend::set_head_buffer(int head_index)
{
VERIFY(m_can_set_head_buffer);
VERIFY(head_index <= 1 && head_index >= 0);
FBHeadVerticalOffset offset { 0, 0 };
if (head_index == 1)
offset.offsetted = 1;
int rc = fb_set_head_vertical_offset_buffer(m_framebuffer_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_framebuffer_fd, buffer_index, flush_rects.data(), (unsigned)flush_rects.size());
if (rc == -ENOTSUP)
m_can_device_flush_buffers = false;
else
return Error::from_syscall("fb_flush_buffers", rc);
return {};
}
}
|
