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
|
#include <cstring>
#include <stdexcept>
#include <sys/mman.h>
#include <xf86drm.h>
#include <xf86drmMode.h>
#include <drm_fourcc.h>
#include <drm.h>
#include <drm_mode.h>
#include "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 char* fourcc)
:Framebuffer(card, width, height)
{
uint32_t a, b, c, d;
a = fourcc[0];
b = fourcc[1];
c = fourcc[2];
d = fourcc[3];
uint32_t code = ((uint32_t)(a) | ((uint32_t)(b) << 8) | ((uint32_t)(c) << 16) | ((uint32_t)(d) << 24));
Create(width, height, code);
}
DumbFramebuffer::~DumbFramebuffer()
{
Destroy();
}
void DumbFramebuffer::print_short() const
{
printf("DumbFramebuffer %d\n", id());
}
struct FormatPlaneInfo
{
uint8_t bitspp; /* bits per (macro) pixel */
uint8_t xsub;
uint8_t ysub;
};
struct FormatInfo
{
uint32_t format;
uint8_t num_planes;
struct FormatPlaneInfo planes[4];
};
static const FormatInfo format_info_array[] = {
/* YUV packed */
{ DRM_FORMAT_UYVY, 1, { { 32, 2, 1 } }, },
{ DRM_FORMAT_YUYV, 1, { { 32, 2, 1 } }, },
/* YUV semi-planar */
{ DRM_FORMAT_NV12, 2, { { 8, 1, 1, }, { 16, 2, 2 } }, },
/* RGB16 */
{ DRM_FORMAT_RGB565, 1, { { 16, 1, 1 } }, },
/* RGB32 */
{ DRM_FORMAT_XRGB8888, 1, { { 32, 1, 1 } }, },
};
static const FormatInfo& find_format(uint32_t format)
{
for (uint i = 0; i < ARRAY_SIZE(format_info_array); ++i) {
if (format == format_info_array[i].format)
return format_info_array[i];
}
throw std::invalid_argument("foo");
}
void DumbFramebuffer::Create(uint32_t width, uint32_t height, uint32_t format)
{
int r;
m_format = format;
const FormatInfo& format_info = find_format(format);
m_num_planes = format_info.num_planes;
for (int i = 0; i < format_info.num_planes; ++i) {
const FormatPlaneInfo& pi = format_info.planes[i];
FramebufferPlane& plane = m_planes[i];
/* create dumb buffer */
struct drm_mode_create_dumb creq = drm_mode_create_dumb();
creq.width = width / pi.xsub;
creq.height = height / pi.ysub;
creq.bpp = pi.bitspp;
r = drmIoctl(card().fd(), DRM_IOCTL_MODE_CREATE_DUMB, &creq);
if (r)
throw std::invalid_argument("foo");
plane.handle = creq.handle;
plane.stride = creq.pitch;
plane.size = creq.height * creq.pitch;
/*
printf("buf %d: %dx%d, bitspp %d, stride %d, size %d\n",
i, creq.width, creq.height, pi->bitspp, plane->stride, plane->size);
*/
/* prepare buffer for memory mapping */
struct drm_mode_map_dumb mreq = drm_mode_map_dumb();
mreq.handle = plane.handle;
r = drmIoctl(card().fd(), DRM_IOCTL_MODE_MAP_DUMB, &mreq);
if (r)
throw std::invalid_argument("foo");
/* perform actual memory mapping */
m_planes[i].map = (uint8_t *)mmap(0, plane.size, PROT_READ | PROT_WRITE, MAP_SHARED,
card().fd(), mreq.offset);
if (plane.map == MAP_FAILED)
throw std::invalid_argument("foo");
/* clear the framebuffer to 0 */
memset(plane.map, 0, plane.size);
}
/* create framebuffer object for the dumb-buffer */
uint32_t bo_handles[4] = { m_planes[0].handle, m_planes[1].handle };
uint32_t pitches[4] = { m_planes[0].stride, m_planes[1].stride };
uint32_t offsets[4] = { 0 };
uint32_t id;
r = drmModeAddFB2(card().fd(), width, height, format,
bo_handles, pitches, offsets, &id, 0);
if (r)
throw std::invalid_argument("foo");
set_id(id);
}
void DumbFramebuffer::Destroy()
{
/* delete framebuffer */
drmModeRmFB(card().fd(), id());
for (uint i = 0; i < m_num_planes; ++i) {
FramebufferPlane& plane = m_planes[i];
/* unmap buffer */
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);
}
}
void DumbFramebuffer::clear()
{
for (unsigned i = 0; i < m_num_planes; ++i)
memset(m_planes[i].map, 0, m_planes[i].size);
}
}
|
