FramebufferSurface.cpp revision f33e4b6f13bc3ee2d2a4e1abd1ada171c70d3492 
1/*
2 **
3 ** Copyright 2012 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#include <stdlib.h>
19#include <stdio.h>
20#include <string.h>
21#include <errno.h>
22
23#include <cutils/log.h>
24
25#include <utils/String8.h>
26
27#include <ui/Rect.h>
28
29#include <EGL/egl.h>
30
31#include <hardware/hardware.h>
32#include <gui/SurfaceTextureClient.h>
33#include <ui/GraphicBuffer.h>
34
35#include "DisplayHardware/FramebufferSurface.h"
36#include "DisplayHardware/GraphicBufferAlloc.h"
37#include "DisplayHardware/HWComposer.h"
38
39// ----------------------------------------------------------------------------
40namespace android {
41// ----------------------------------------------------------------------------
42
43/*
44 * This implements the (main) framebuffer management. This class is used
45 * mostly by SurfaceFlinger, but also by command line GL application.
46 *
47 */
48
49FramebufferSurface::FramebufferSurface(HWComposer& hwc) :
50    ConsumerBase(new BufferQueue(true, new GraphicBufferAlloc())),
51    mCurrentBufferSlot(-1),
52    mCurrentBuffer(0),
53    mHwc(hwc)
54{
55    mName = "FramebufferSurface";
56    mBufferQueue->setConsumerName(mName);
57    mBufferQueue->setConsumerUsageBits(GRALLOC_USAGE_HW_FB |
58                                       GRALLOC_USAGE_HW_RENDER | GRALLOC_USAGE_HW_COMPOSER);
59    mBufferQueue->setDefaultBufferFormat(mHwc.getFormat(HWC_DISPLAY_PRIMARY));
60    mBufferQueue->setDefaultBufferSize(mHwc.getWidth(HWC_DISPLAY_PRIMARY),
61                                       mHwc.getHeight(HWC_DISPLAY_PRIMARY));
62    mBufferQueue->setSynchronousMode(true);
63    mBufferQueue->setDefaultMaxBufferCount(NUM_FRAME_BUFFERS);
64}
65
66status_t FramebufferSurface::nextBuffer(sp<GraphicBuffer>& outBuffer, sp<Fence>& outFence) {
67    Mutex::Autolock lock(mMutex);
68
69    BufferQueue::BufferItem item;
70    status_t err = acquireBufferLocked(&item);
71    if (err == BufferQueue::NO_BUFFER_AVAILABLE) {
72        outBuffer = mCurrentBuffer;
73        return NO_ERROR;
74    } else if (err != NO_ERROR) {
75        ALOGE("error acquiring buffer: %s (%d)", strerror(-err), err);
76        return err;
77    }
78
79    // If the BufferQueue has freed and reallocated a buffer in mCurrentSlot
80    // then we may have acquired the slot we already own.  If we had released
81    // our current buffer before we call acquireBuffer then that release call
82    // would have returned STALE_BUFFER_SLOT, and we would have called
83    // freeBufferLocked on that slot.  Because the buffer slot has already
84    // been overwritten with the new buffer all we have to do is skip the
85    // releaseBuffer call and we should be in the same state we'd be in if we
86    // had released the old buffer first.
87    if (mCurrentBufferSlot != BufferQueue::INVALID_BUFFER_SLOT &&
88        item.mBuf != mCurrentBufferSlot) {
89        // Release the previous buffer.
90        err = releaseBufferLocked(mCurrentBufferSlot, EGL_NO_DISPLAY,
91                EGL_NO_SYNC_KHR);
92        if (err != NO_ERROR && err != BufferQueue::STALE_BUFFER_SLOT) {
93            ALOGE("error releasing buffer: %s (%d)", strerror(-err), err);
94            return err;
95        }
96    }
97    mCurrentBufferSlot = item.mBuf;
98    mCurrentBuffer = mSlots[mCurrentBufferSlot].mGraphicBuffer;
99    outFence = item.mFence;
100    outBuffer = mCurrentBuffer;
101    return NO_ERROR;
102}
103
104// Overrides ConsumerBase::onFrameAvailable(), does not call base class impl.
105void FramebufferSurface::onFrameAvailable() {
106    sp<GraphicBuffer> buf;
107    sp<Fence> acquireFence;
108    status_t err = nextBuffer(buf, acquireFence);
109    if (err != NO_ERROR) {
110        ALOGE("error latching nnext FramebufferSurface buffer: %s (%d)",
111                strerror(-err), err);
112        return;
113    }
114    err = mHwc.fbPost(0, acquireFence, buf); // FIXME: use real display id
115    if (err != NO_ERROR) {
116        ALOGE("error posting framebuffer: %d", err);
117    }
118}
119
120void FramebufferSurface::freeBufferLocked(int slotIndex) {
121    ConsumerBase::freeBufferLocked(slotIndex);
122    if (slotIndex == mCurrentBufferSlot) {
123        mCurrentBufferSlot = BufferQueue::INVALID_BUFFER_SLOT;
124    }
125}
126
127status_t FramebufferSurface::setReleaseFenceFd(int fenceFd) {
128    status_t err = NO_ERROR;
129    if (fenceFd >= 0) {
130        sp<Fence> fence(new Fence(fenceFd));
131        if (mCurrentBufferSlot != BufferQueue::INVALID_BUFFER_SLOT) {
132            status_t err = addReleaseFence(mCurrentBufferSlot, fence);
133            ALOGE_IF(err, "setReleaseFenceFd: failed to add the fence: %s (%d)",
134                    strerror(-err), err);
135        }
136    }
137    return err;
138}
139
140status_t FramebufferSurface::setUpdateRectangle(const Rect& r)
141{
142    return INVALID_OPERATION;
143}
144
145status_t FramebufferSurface::compositionComplete()
146{
147    return mHwc.fbCompositionComplete();
148}
149
150void FramebufferSurface::dump(String8& result) {
151    mHwc.fbDump(result);
152    ConsumerBase::dump(result);
153}
154
155// ----------------------------------------------------------------------------
156}; // namespace android
157// ----------------------------------------------------------------------------
158