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
|
#include <cstring>
#include <cerrno>
#include <stdexcept>
#include <sys/mman.h>
#include <xf86drm.h>
#include <xf86drmMode.h>
#include <fcntl.h>
#include <unistd.h>
#include <drm_fourcc.h>
#include <drm.h>
#include <drm_mode.h>
#include <kms++/kms++.h>
#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
using namespace std;
namespace kms
{
DumbFramebuffer::DumbFramebuffer(Card &card, uint32_t width, uint32_t height, const string& fourcc)
:DumbFramebuffer(card, width, height, FourCCToPixelFormat(fourcc))
{
}
DumbFramebuffer::DumbFramebuffer(Card& card, uint32_t width, uint32_t height, PixelFormat format)
:Framebuffer(card, width, height), m_format(format)
{
int r;
const PixelFormatInfo& format_info = get_pixel_format_info(m_format);
m_num_planes = format_info.num_planes;
for (int i = 0; i < format_info.num_planes; ++i) {
const PixelFormatPlaneInfo& pi = format_info.planes[i];
FramebufferPlane& plane = m_planes.at(i);
/* create dumb buffer */
struct drm_mode_create_dumb creq = drm_mode_create_dumb();
creq.width = width;
creq.height = height / pi.ysub;
/*
* For fully planar YUV buffers, the chroma planes don't combine
* U and V components, their width must thus be divided by the
* horizontal subsampling factor.
*/
if (format_info.type == PixelColorType::YUV &&
format_info.num_planes == 3)
creq.width /= pi.xsub;
creq.bpp = pi.bitspp;
r = drmIoctl(card.fd(), DRM_IOCTL_MODE_CREATE_DUMB, &creq);
if (r)
throw invalid_argument(string("DRM_IOCTL_MODE_CREATE_DUMB failed: ") + strerror(errno));
plane.handle = creq.handle;
plane.stride = creq.pitch;
plane.size = creq.height * creq.pitch;
plane.offset = 0;
plane.map = 0;
plane.prime_fd = -1;
}
/* create framebuffer object for the dumb-buffer */
uint32_t bo_handles[4] = {
m_planes[0].handle, m_planes[1].handle,
m_planes[2].handle, m_planes[3].handle,
};
uint32_t pitches[4] = {
m_planes[0].stride, m_planes[1].stride,
m_planes[2].stride, m_planes[3].stride,
};
uint32_t offsets[4] = {
m_planes[0].offset, m_planes[1].offset,
m_planes[2].offset, m_planes[3].offset,
};
uint32_t id;
r = drmModeAddFB2(card.fd(), width, height, (uint32_t)format,
bo_handles, pitches, offsets, &id, 0);
if (r)
throw invalid_argument(string("drmModeAddFB2 failed: ") + strerror(errno));
set_id(id);
}
DumbFramebuffer::~DumbFramebuffer()
{
/* delete framebuffer */
drmModeRmFB(card().fd(), id());
for (uint i = 0; i < m_num_planes; ++i) {
FramebufferPlane& plane = m_planes.at(i);
/* unmap buffer */
if (plane.map)
munmap(plane.map, plane.size);
/* delete dumb buffer */
struct drm_mode_destroy_dumb dreq = drm_mode_destroy_dumb();
dreq.handle = plane.handle;
drmIoctl(card().fd(), DRM_IOCTL_MODE_DESTROY_DUMB, &dreq);
if (plane.prime_fd >= 0)
::close(plane.prime_fd);
}
}
uint8_t* DumbFramebuffer::map(unsigned plane)
{
FramebufferPlane& p = m_planes.at(plane);
if (p.map)
return p.map;
/* prepare buffer for memory mapping */
struct drm_mode_map_dumb mreq = drm_mode_map_dumb();
mreq.handle = p.handle;
int r = drmIoctl(card().fd(), DRM_IOCTL_MODE_MAP_DUMB, &mreq);
if (r)
throw invalid_argument(string("DRM_IOCTL_MODE_MAP_DUMB failed: ") + strerror(errno));
/* perform actual memory mapping */
p.map = (uint8_t *)mmap(0, p.size, PROT_READ | PROT_WRITE, MAP_SHARED,
card().fd(), mreq.offset);
if (p.map == MAP_FAILED)
throw invalid_argument(string("mmap failed: ") + strerror(errno));
return p.map;
}
int DumbFramebuffer::prime_fd(unsigned int plane)
{
if (m_planes.at(plane).prime_fd >= 0)
return m_planes.at(plane).prime_fd;
int r = drmPrimeHandleToFD(card().fd(), m_planes.at(plane).handle,
DRM_CLOEXEC | O_RDWR, &m_planes.at(plane).prime_fd);
if (r)
throw std::runtime_error("drmPrimeHandleToFD failed");
return m_planes.at(plane).prime_fd;
}
}
|
