FramebufferNativeWindow.cpp revision 74faca212e2675aa55a30235c77cb6403471a4b9 
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#include <utils/RefBase.h>
29
30#include <ui/SurfaceComposerClient.h>
31#include <ui/Rect.h>
32#include <ui/FramebufferNativeWindow.h>
33
34#include <EGL/egl.h>
35
36#include <pixelflinger/format.h>
37#include <pixelflinger/pixelflinger.h>
38
39#include <hardware/hardware.h>
40#include <hardware/gralloc.h>
41
42#include <private/ui/android_natives_priv.h>
43
44// ----------------------------------------------------------------------------
45namespace android {
46// ----------------------------------------------------------------------------
47
48class NativeBuffer
49    : public EGLNativeBase<
50        android_native_buffer_t,
51        NativeBuffer,
52        LightRefBase<NativeBuffer> >
53{
54public:
55    NativeBuffer(int w, int h, int f, int u) : BASE() {
56        android_native_buffer_t::width  = w;
57        android_native_buffer_t::height = h;
58        android_native_buffer_t::format = f;
59        android_native_buffer_t::usage  = u;
60    }
61private:
62    friend class LightRefBase<NativeBuffer>;
63    ~NativeBuffer() { }; // this class cannot be overloaded
64};
65
66
67/*
68 * This implements the (main) framebuffer management. This class is used
69 * mostly by SurfaceFlinger, but also by command line GL application.
70 *
71 * In fact this is an implementation of android_native_window_t on top of
72 * the framebuffer.
73 *
74 * Currently it is pretty simple, it manages only two buffers (the front and
75 * back buffer).
76 *
77 */
78
79FramebufferNativeWindow::FramebufferNativeWindow()
80    : BASE(), fbDev(0), grDev(0), mUpdateOnDemand(false)
81{
82    hw_module_t const* module;
83    if (hw_get_module(GRALLOC_HARDWARE_MODULE_ID, &module) == 0) {
84        int stride;
85        int err;
86        err = framebuffer_open(module, &fbDev);
87        LOGE_IF(err, "couldn't open framebuffer HAL (%s)", strerror(-err));
88
89        err = gralloc_open(module, &grDev);
90        LOGE_IF(err, "couldn't open gralloc HAL (%s)", strerror(-err));
91
92        // bail out if we can't initialize the modules
93        if (!fbDev || !grDev)
94            return;
95
96        mUpdateOnDemand = (fbDev->setUpdateRect != 0);
97
98        // initialize the buffer FIFO
99        mNumBuffers = 2;
100        mNumFreeBuffers = 2;
101        mBufferHead = mNumBuffers-1;
102        buffers[0] = new NativeBuffer(
103                fbDev->width, fbDev->height, fbDev->format, GRALLOC_USAGE_HW_FB);
104        buffers[1] = new NativeBuffer(
105                fbDev->width, fbDev->height, fbDev->format, GRALLOC_USAGE_HW_FB);
106
107        err = grDev->alloc(grDev,
108                fbDev->width, fbDev->height, fbDev->format,
109                GRALLOC_USAGE_HW_FB, &buffers[0]->handle, &buffers[0]->stride);
110
111        LOGE_IF(err, "fb buffer 0 allocation failed w=%d, h=%d, err=%s",
112                fbDev->width, fbDev->height, strerror(-err));
113
114        err = grDev->alloc(grDev,
115                fbDev->width, fbDev->height, fbDev->format,
116                GRALLOC_USAGE_HW_FB, &buffers[1]->handle, &buffers[1]->stride);
117
118        LOGE_IF(err, "fb buffer 1 allocation failed w=%d, h=%d, err=%s",
119                fbDev->width, fbDev->height, strerror(-err));
120    }
121
122    const_cast<uint32_t&>(android_native_window_t::flags) = fbDev->flags;
123    const_cast<float&>(android_native_window_t::xdpi) = fbDev->xdpi;
124    const_cast<float&>(android_native_window_t::ydpi) = fbDev->ydpi;
125    const_cast<int&>(android_native_window_t::minSwapInterval) =
126        fbDev->minSwapInterval;
127    const_cast<int&>(android_native_window_t::maxSwapInterval) =
128        fbDev->maxSwapInterval;
129
130    android_native_window_t::setSwapInterval = setSwapInterval;
131    android_native_window_t::dequeueBuffer = dequeueBuffer;
132    android_native_window_t::lockBuffer = lockBuffer;
133    android_native_window_t::queueBuffer = queueBuffer;
134    android_native_window_t::query = query;
135    android_native_window_t::perform = perform;
136}
137
138FramebufferNativeWindow::~FramebufferNativeWindow()
139{
140    if (grDev) {
141        if (buffers[0] != NULL)
142            grDev->free(grDev, buffers[0]->handle);
143        if (buffers[1] != NULL)
144            grDev->free(grDev, buffers[1]->handle);
145        gralloc_close(grDev);
146    }
147
148    if (fbDev) {
149        framebuffer_close(fbDev);
150    }
151}
152
153status_t FramebufferNativeWindow::setUpdateRectangle(const Rect& r)
154{
155    if (!mUpdateOnDemand) {
156        return INVALID_OPERATION;
157    }
158    return fbDev->setUpdateRect(fbDev, r.left, r.top, r.width(), r.height());
159}
160
161status_t FramebufferNativeWindow::compositionComplete()
162{
163    if (fbDev->compositionComplete) {
164        return fbDev->compositionComplete(fbDev);
165    }
166    return INVALID_OPERATION;
167}
168
169int FramebufferNativeWindow::setSwapInterval(
170        android_native_window_t* window, int interval)
171{
172    framebuffer_device_t* fb = getSelf(window)->fbDev;
173    return fb->setSwapInterval(fb, interval);
174}
175
176int FramebufferNativeWindow::dequeueBuffer(android_native_window_t* window,
177        android_native_buffer_t** buffer)
178{
179    FramebufferNativeWindow* self = getSelf(window);
180    Mutex::Autolock _l(self->mutex);
181    framebuffer_device_t* fb = self->fbDev;
182
183    // wait for a free buffer
184    while (!self->mNumFreeBuffers) {
185        self->mCondition.wait(self->mutex);
186    }
187    // get this buffer
188    self->mNumFreeBuffers--;
189    int index = self->mBufferHead++;
190    if (self->mBufferHead >= self->mNumBuffers)
191        self->mBufferHead = 0;
192
193    *buffer = self->buffers[index].get();
194
195    return 0;
196}
197
198int FramebufferNativeWindow::lockBuffer(android_native_window_t* window,
199        android_native_buffer_t* buffer)
200{
201    FramebufferNativeWindow* self = getSelf(window);
202    Mutex::Autolock _l(self->mutex);
203
204    // wait that the buffer we're locking is not front anymore
205    while (self->front == buffer) {
206        self->mCondition.wait(self->mutex);
207    }
208
209    return NO_ERROR;
210}
211
212int FramebufferNativeWindow::queueBuffer(android_native_window_t* window,
213        android_native_buffer_t* buffer)
214{
215    FramebufferNativeWindow* self = getSelf(window);
216    Mutex::Autolock _l(self->mutex);
217    framebuffer_device_t* fb = self->fbDev;
218    buffer_handle_t handle = static_cast<NativeBuffer*>(buffer)->handle;
219    int res = fb->post(fb, handle);
220    self->front = static_cast<NativeBuffer*>(buffer);
221    self->mNumFreeBuffers++;
222    self->mCondition.broadcast();
223    return res;
224}
225
226int FramebufferNativeWindow::query(android_native_window_t* window,
227        int what, int* value)
228{
229    FramebufferNativeWindow* self = getSelf(window);
230    Mutex::Autolock _l(self->mutex);
231    framebuffer_device_t* fb = self->fbDev;
232    switch (what) {
233        case NATIVE_WINDOW_WIDTH:
234            *value = fb->width;
235            return NO_ERROR;
236        case NATIVE_WINDOW_HEIGHT:
237            *value = fb->height;
238            return NO_ERROR;
239        case NATIVE_WINDOW_FORMAT:
240            *value = fb->format;
241            return NO_ERROR;
242    }
243    *value = 0;
244    return BAD_VALUE;
245}
246
247int FramebufferNativeWindow::perform(android_native_window_t* window,
248        int operation, ...)
249{
250    switch (operation) {
251        case NATIVE_WINDOW_SET_USAGE:
252            break;
253        default:
254            return NAME_NOT_FOUND;
255    }
256    return NO_ERROR;
257}
258
259// ----------------------------------------------------------------------------
260}; // namespace android
261// ----------------------------------------------------------------------------
262
263using namespace android;
264
265EGLNativeWindowType android_createDisplaySurface(void)
266{
267    FramebufferNativeWindow* w;
268    w = new FramebufferNativeWindow();
269    if (w->getDevice() == NULL) {
270        // get a ref so it can be destroyed when we exit this block
271        sp<FramebufferNativeWindow> ref(w);
272        return NULL;
273    }
274    return (EGLNativeWindowType)w;
275}
276