FramebufferSurface.cpp revision f5a33928349bebc8eebc9f466618997e98c24e68 
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, int disp) :
50    ConsumerBase(new BufferQueue(true, new GraphicBufferAlloc())),
51    mDisplayType(disp),
52    mCurrentBufferSlot(-1),
53    mCurrentBuffer(0),
54    mHwc(hwc)
55{
56    mName = "FramebufferSurface";
57    mBufferQueue->setConsumerName(mName);
58    mBufferQueue->setConsumerUsageBits(GRALLOC_USAGE_HW_FB |
59                                       GRALLOC_USAGE_HW_RENDER |
60                                       GRALLOC_USAGE_HW_COMPOSER);
61    mBufferQueue->setDefaultBufferFormat(mHwc.getFormat(disp));
62    mBufferQueue->setDefaultBufferSize(mHwc.getWidth(disp),  mHwc.getHeight(disp));
63    mBufferQueue->setSynchronousMode(true);
64    mBufferQueue->setDefaultMaxBufferCount(NUM_FRAME_BUFFERS);
65}
66
67status_t FramebufferSurface::nextBuffer(sp<GraphicBuffer>& outBuffer, sp<Fence>& outFence) {
68    Mutex::Autolock lock(mMutex);
69
70    BufferQueue::BufferItem item;
71    status_t err = acquireBufferLocked(&item);
72    if (err == BufferQueue::NO_BUFFER_AVAILABLE) {
73        outBuffer = mCurrentBuffer;
74        return NO_ERROR;
75    } else if (err != NO_ERROR) {
76        ALOGE("error acquiring buffer: %s (%d)", strerror(-err), err);
77        return err;
78    }
79
80    // If the BufferQueue has freed and reallocated a buffer in mCurrentSlot
81    // then we may have acquired the slot we already own.  If we had released
82    // our current buffer before we call acquireBuffer then that release call
83    // would have returned STALE_BUFFER_SLOT, and we would have called
84    // freeBufferLocked on that slot.  Because the buffer slot has already
85    // been overwritten with the new buffer all we have to do is skip the
86    // releaseBuffer call and we should be in the same state we'd be in if we
87    // had released the old buffer first.
88    if (mCurrentBufferSlot != BufferQueue::INVALID_BUFFER_SLOT &&
89        item.mBuf != mCurrentBufferSlot) {
90        // Release the previous buffer.
91        err = releaseBufferLocked(mCurrentBufferSlot, EGL_NO_DISPLAY,
92                EGL_NO_SYNC_KHR);
93        if (err != NO_ERROR && err != BufferQueue::STALE_BUFFER_SLOT) {
94            ALOGE("error releasing buffer: %s (%d)", strerror(-err), err);
95            return err;
96        }
97    }
98    mCurrentBufferSlot = item.mBuf;
99    mCurrentBuffer = mSlots[mCurrentBufferSlot].mGraphicBuffer;
100    outFence = item.mFence;
101    outBuffer = mCurrentBuffer;
102    return NO_ERROR;
103}
104
105// Overrides ConsumerBase::onFrameAvailable(), does not call base class impl.
106void FramebufferSurface::onFrameAvailable() {
107    sp<GraphicBuffer> buf;
108    sp<Fence> acquireFence;
109    status_t err = nextBuffer(buf, acquireFence);
110    if (err != NO_ERROR) {
111        ALOGE("error latching nnext FramebufferSurface buffer: %s (%d)",
112                strerror(-err), err);
113        return;
114    }
115    err = mHwc.fbPost(mDisplayType, acquireFence, buf);
116    if (err != NO_ERROR) {
117        ALOGE("error posting framebuffer: %d", err);
118    }
119}
120
121void FramebufferSurface::freeBufferLocked(int slotIndex) {
122    ConsumerBase::freeBufferLocked(slotIndex);
123    if (slotIndex == mCurrentBufferSlot) {
124        mCurrentBufferSlot = BufferQueue::INVALID_BUFFER_SLOT;
125    }
126}
127
128status_t FramebufferSurface::setReleaseFenceFd(int fenceFd) {
129    status_t err = NO_ERROR;
130    if (fenceFd >= 0) {
131        sp<Fence> fence(new Fence(fenceFd));
132        if (mCurrentBufferSlot != BufferQueue::INVALID_BUFFER_SLOT) {
133            status_t err = addReleaseFence(mCurrentBufferSlot, fence);
134            ALOGE_IF(err, "setReleaseFenceFd: failed to add the fence: %s (%d)",
135                    strerror(-err), err);
136        }
137    }
138    return err;
139}
140
141status_t FramebufferSurface::setUpdateRectangle(const Rect& r)
142{
143    return INVALID_OPERATION;
144}
145
146status_t FramebufferSurface::compositionComplete()
147{
148    return mHwc.fbCompositionComplete();
149}
150
151void FramebufferSurface::dump(String8& result) {
152    mHwc.fbDump(result);
153    ConsumerBase::dump(result);
154}
155
156// ----------------------------------------------------------------------------
157}; // namespace android
158// ----------------------------------------------------------------------------
159