FramebufferNativeWindow.cpp revision 69029eb5abfaeb52716b84db89e32dc742551508 
1/*
2**
3** Copyright 2007 The Android Open Source Project
4**
5** Licensed under the Apache License Version 2.0(the "License");
6** you may not use this file except in compliance with the License.
7** You may obtain a copy of the License at
8**
9**     http://www.apache.org/licenses/LICENSE-2.0
10**
11** Unless required by applicable law or agreed to in writing software
12** distributed under the License is distributed on an "AS IS" BASIS
13** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND either express or implied.
14** See the License for the specific language governing permissions and
15** limitations under the License.
16*/
17
18#define LOG_TAG "FramebufferNativeWindow"
19
20#include <stdlib.h>
21#include <stdio.h>
22#include <string.h>
23#include <errno.h>
24
25#include <cutils/log.h>
26#include <cutils/atomic.h>
27#include <utils/threads.h>
28
29#include <ui/SurfaceComposerClient.h>
30#include <ui/Rect.h>
31#include <ui/FramebufferNativeWindow.h>
32
33#include <EGL/egl.h>
34
35#include <pixelflinger/format.h>
36#include <pixelflinger/pixelflinger.h>
37
38#include <hardware/hardware.h>
39#include <hardware/gralloc.h>
40
41#include <private/ui/android_natives_priv.h>
42
43// ----------------------------------------------------------------------------
44namespace android {
45// ----------------------------------------------------------------------------
46
47class NativeBuffer
48    : public EGLNativeBase<
49        android_native_buffer_t,
50        NativeBuffer,
51        LightRefBase<NativeBuffer> >
52{
53public:
54    NativeBuffer(int w, int h, int f, int u) : BASE() {
55        android_native_buffer_t::width  = w;
56        android_native_buffer_t::height = h;
57        android_native_buffer_t::format = f;
58        android_native_buffer_t::usage  = u;
59    }
60private:
61    friend class LightRefBase<NativeBuffer>;
62    ~NativeBuffer() { }; // this class cannot be overloaded
63};
64
65
66android_native_buffer_t const* FramebufferNativeWindow::getBackbuffer() const {
67    return static_cast<android_native_buffer_t const*>(buffers[mLastDequeued].get());
68}
69
70
71/*
72 * This implements the (main) framebuffer management. This class is used
73 * mostly by SurfaceFlinger, but also by command line GL application.
74 *
75 * In fact this is an implementation of android_native_window_t on top of
76 * the framebuffer.
77 *
78 * Currently it is pretty simple, it manages only two buffers (the front and
79 * back buffer).
80 *
81 */
82
83FramebufferNativeWindow::FramebufferNativeWindow()
84    : BASE(), fbDev(0), grDev(0), mUpdateOnDemand(false)
85{
86    hw_module_t const* module;
87    if (hw_get_module(GRALLOC_HARDWARE_MODULE_ID, &module) == 0) {
88        int stride;
89        framebuffer_open(module, &fbDev);
90        gralloc_open(module, &grDev);
91        int err;
92
93
94        mUpdateOnDemand = (fbDev->setUpdateRect != 0);
95
96        // initialize the buffer FIFO
97        mNumBuffers = 2;
98        mNumFreeBuffers = 2;
99        mBufferHead = mNumBuffers-1;
100        buffers[0] = new NativeBuffer(
101                fbDev->width, fbDev->height, fbDev->format, GRALLOC_USAGE_HW_FB);
102        buffers[1] = new NativeBuffer(
103                fbDev->width, fbDev->height, fbDev->format, GRALLOC_USAGE_HW_FB);
104
105        err = grDev->alloc(grDev,
106                fbDev->width, fbDev->height, fbDev->format,
107                GRALLOC_USAGE_HW_FB, &buffers[0]->handle, &buffers[0]->stride);
108
109        LOGE_IF(err, "fb buffer 0 allocation failed w=%d, h=%d, err=%s",
110                fbDev->width, fbDev->height, strerror(-err));
111
112        err = grDev->alloc(grDev,
113                fbDev->width, fbDev->height, fbDev->format,
114                GRALLOC_USAGE_HW_FB, &buffers[1]->handle, &buffers[1]->stride);
115
116        LOGE_IF(err, "fb buffer 1 allocation failed w=%d, h=%d, err=%s",
117                fbDev->width, fbDev->height, strerror(-err));
118    }
119
120    const_cast<uint32_t&>(android_native_window_t::flags) = fbDev->flags;
121    const_cast<float&>(android_native_window_t::xdpi) = fbDev->xdpi;
122    const_cast<float&>(android_native_window_t::ydpi) = fbDev->ydpi;
123    const_cast<int&>(android_native_window_t::minSwapInterval) =
124        fbDev->minSwapInterval;
125    const_cast<int&>(android_native_window_t::maxSwapInterval) =
126        fbDev->maxSwapInterval;
127
128    android_native_window_t::setSwapInterval = setSwapInterval;
129    android_native_window_t::dequeueBuffer = dequeueBuffer;
130    android_native_window_t::lockBuffer = lockBuffer;
131    android_native_window_t::queueBuffer = queueBuffer;
132}
133
134FramebufferNativeWindow::~FramebufferNativeWindow() {
135    grDev->free(grDev, buffers[0]->handle);
136    grDev->free(grDev, buffers[1]->handle);
137    gralloc_close(grDev);
138    framebuffer_close(fbDev);
139}
140
141status_t FramebufferNativeWindow::setUpdateRectangle(const Rect& r)
142{
143    if (!mUpdateOnDemand) {
144        return INVALID_OPERATION;
145    }
146    return fbDev->setUpdateRect(fbDev, r.left, r.top, r.width(), r.height());
147}
148
149int FramebufferNativeWindow::setSwapInterval(
150        android_native_window_t* window, int interval)
151{
152    framebuffer_device_t* fb = getSelf(window)->fbDev;
153    return fb->setSwapInterval(fb, interval);
154}
155
156int FramebufferNativeWindow::dequeueBuffer(android_native_window_t* window,
157        android_native_buffer_t** buffer)
158{
159    FramebufferNativeWindow* self = getSelf(window);
160    Mutex::Autolock _l(self->mutex);
161    framebuffer_device_t* fb = self->fbDev;
162
163    // wait for a free buffer
164    while (!self->mNumFreeBuffers) {
165        self->mCondition.wait(self->mutex);
166    }
167    // get this buffer
168    self->mNumFreeBuffers--;
169    int index = self->mBufferHead++;
170    if (self->mBufferHead >= self->mNumBuffers)
171        self->mBufferHead = 0;
172
173    self->mLastDequeued = index;
174    *buffer = self->buffers[index].get();
175
176    return 0;
177}
178
179int FramebufferNativeWindow::lockBuffer(android_native_window_t* window,
180        android_native_buffer_t* buffer)
181{
182    FramebufferNativeWindow* self = getSelf(window);
183    Mutex::Autolock _l(self->mutex);
184
185    // wait that the buffer we're locking is not front anymore
186    while (self->front == buffer) {
187        self->mCondition.wait(self->mutex);
188    }
189
190    return NO_ERROR;
191}
192
193int FramebufferNativeWindow::queueBuffer(android_native_window_t* window,
194        android_native_buffer_t* buffer)
195{
196    FramebufferNativeWindow* self = getSelf(window);
197    Mutex::Autolock _l(self->mutex);
198    framebuffer_device_t* fb = self->fbDev;
199    buffer_handle_t handle = static_cast<NativeBuffer*>(buffer)->handle;
200    int res = fb->post(fb, handle);
201    self->front = static_cast<NativeBuffer*>(buffer);
202    self->mNumFreeBuffers++;
203    self->mCondition.broadcast();
204    return res;
205}
206
207// ----------------------------------------------------------------------------
208}; // namespace android
209// ----------------------------------------------------------------------------
210
211
212EGLNativeWindowType android_createDisplaySurface(void)
213{
214    return new android::FramebufferNativeWindow();
215}
216
217