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
|
/*
**
** Copyright 2007 The Android Open Source Project
**
** Licensed under the Apache License Version 2.0(the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
**
** http://www.apache.org/licenses/LICENSE-2.0
**
** Unless required by applicable law or agreed to in writing software
** distributed under the License is distributed on an "AS IS" BASIS
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*/
#define LOG_TAG "FramebufferNativeWindow"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <cutils/log.h>
#include <cutils/atomic.h>
#include <utils/threads.h>
#include <ui/SurfaceComposerClient.h>
#include <ui/Rect.h>
#include <ui/FramebufferNativeWindow.h>
#include <EGL/egl.h>
#include <pixelflinger/format.h>
#include <pixelflinger/pixelflinger.h>
#include <hardware/hardware.h>
#include <hardware/gralloc.h>
// ----------------------------------------------------------------------------
namespace android {
// ----------------------------------------------------------------------------
/*
* This implements the (main) framebuffer management. This class is used
* mostly by SurfaceFlinger, but also by command line GL application.
*
* In fact this is an implementation of android_native_window_t on top of
* the framebuffer.
*
* Currently it is pretty simple, it manages only two buffers (the front and
* back buffer).
*
*/
FramebufferNativeWindow::FramebufferNativeWindow()
: BASE(), fbDev(0), grDev(0)
{
hw_module_t const* module;
if (hw_get_module(GRALLOC_HARDWARE_MODULE_ID, &module) == 0) {
int stride;
framebuffer_open(module, &fbDev);
gralloc_open(module, &grDev);
int err;
// initialize the buffer FIFO
mNumBuffers = 2;
mNumFreeBuffers = 2;
mBufferHead = mNumBuffers-1;
buffers[0] = new NativeBuffer(
fbDev->width, fbDev->height, fbDev->format, GRALLOC_USAGE_HW_FB);
buffers[1] = new NativeBuffer(
fbDev->width, fbDev->height, fbDev->format, GRALLOC_USAGE_HW_FB);
err = grDev->alloc(grDev,
fbDev->width, fbDev->height, fbDev->format,
GRALLOC_USAGE_HW_FB, &buffers[0]->handle, &buffers[0]->stride);
LOGE_IF(err, "fb buffer 0 allocation failed w=%d, h=%d, err=%s",
fbDev->width, fbDev->height, strerror(-err));
err = grDev->alloc(grDev,
fbDev->width, fbDev->height, fbDev->format,
GRALLOC_USAGE_HW_FB, &buffers[1]->handle, &buffers[1]->stride);
LOGE_IF(err, "fb buffer 1 allocation failed w=%d, h=%d, err=%s",
fbDev->width, fbDev->height, strerror(-err));
}
uint32_t flags = fbDev->flags & SURFACE_FLAG_MAPPED;
/*
* FIXME: SURFACE_FLAG_PRESERVE_CONTENT
* how to implement this, there is no concept of preserve content in
* the framebuffer, which just "posts" buffer.
*
* It looks like what we need is a way to know if the posted buffer can
* be reused. But if so, why allocating 2 buffers?...
*
* should the lock/unlock calls take care of the copy-back?
*
*
* In the end, the client wants to know if the backbuffer is preserved
* though... it's complicated.
*
*/
//flags |= SURFACE_FLAG_PRESERVE_CONTENT;
const_cast<uint32_t&>(android_native_window_t::flags) = flags;
const_cast<float&>(android_native_window_t::xdpi) = fbDev->xdpi;
const_cast<float&>(android_native_window_t::ydpi) = fbDev->ydpi;
const_cast<int&>(android_native_window_t::minSwapInterval) =
fbDev->minSwapInterval;
const_cast<int&>(android_native_window_t::maxSwapInterval) =
fbDev->maxSwapInterval;
android_native_window_t::setSwapInterval = setSwapInterval;
android_native_window_t::dequeueBuffer = dequeueBuffer;
android_native_window_t::lockBuffer = lockBuffer;
android_native_window_t::queueBuffer = queueBuffer;
}
FramebufferNativeWindow::~FramebufferNativeWindow() {
grDev->free(grDev, buffers[0]->handle);
grDev->free(grDev, buffers[1]->handle);
gralloc_close(grDev);
framebuffer_close(fbDev);
}
int FramebufferNativeWindow::setSwapInterval(
android_native_window_t* window, int interval)
{
framebuffer_device_t* fb = getSelf(window)->fbDev;
return fb->setSwapInterval(fb, interval);
}
int FramebufferNativeWindow::dequeueBuffer(android_native_window_t* window,
android_native_buffer_t** buffer)
{
FramebufferNativeWindow* self = getSelf(window);
Mutex::Autolock _l(self->mutex);
framebuffer_device_t* fb = self->fbDev;
// wait for a free buffer
while (!self->mNumFreeBuffers) {
self->mCondition.wait(self->mutex);
}
// get this buffer
self->mNumFreeBuffers--;
int index = self->mBufferHead++;
if (self->mBufferHead >= self->mNumBuffers)
self->mBufferHead = 0;
*buffer = self->buffers[index].get();
return 0;
}
int FramebufferNativeWindow::lockBuffer(android_native_window_t* window,
android_native_buffer_t* buffer)
{
FramebufferNativeWindow* self = getSelf(window);
Mutex::Autolock _l(self->mutex);
// wait that the buffer we're locking is not front anymore
while (self->front == buffer) {
self->mCondition.wait(self->mutex);
}
return NO_ERROR;
}
int FramebufferNativeWindow::queueBuffer(android_native_window_t* window,
android_native_buffer_t* buffer)
{
FramebufferNativeWindow* self = getSelf(window);
Mutex::Autolock _l(self->mutex);
framebuffer_device_t* fb = self->fbDev;
buffer_handle_t handle = static_cast<NativeBuffer*>(buffer)->handle;
int res = fb->post(fb, handle);
self->front = static_cast<NativeBuffer*>(buffer);
self->mNumFreeBuffers++;
self->mCondition.broadcast();
return res;
}
// ----------------------------------------------------------------------------
}; // namespace android
// ----------------------------------------------------------------------------
EGLNativeWindowType android_createDisplaySurface(void)
{
return new android::FramebufferNativeWindow();
}
|
