FramebufferSurface.cpp revision 47650f4f66a49e1815ad08ca4fb12a661d133abc 
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/BufferItem.h>
33#include <gui/GraphicBufferAlloc.h>
34#include <gui/Surface.h>
35#include <ui/GraphicBuffer.h>
36
37#include "FramebufferSurface.h"
38#include "HWComposer.h"
39
40#ifndef NUM_FRAMEBUFFER_SURFACE_BUFFERS
41#define NUM_FRAMEBUFFER_SURFACE_BUFFERS (2)
42#endif
43
44// ----------------------------------------------------------------------------
45namespace android {
46// ----------------------------------------------------------------------------
47
48/*
49 * This implements the (main) framebuffer management. This class is used
50 * mostly by SurfaceFlinger, but also by command line GL application.
51 *
52 */
53
54FramebufferSurface::FramebufferSurface(HWComposer& hwc, int disp,
55        const sp<IGraphicBufferConsumer>& consumer) :
56    ConsumerBase(consumer),
57    mDisplayType(disp),
58    mCurrentBufferSlot(-1),
59    mCurrentBuffer(0),
60    mHwc(hwc)
61{
62    mName = "FramebufferSurface";
63    mConsumer->setConsumerName(mName);
64    mConsumer->setConsumerUsageBits(GRALLOC_USAGE_HW_FB |
65                                       GRALLOC_USAGE_HW_RENDER |
66                                       GRALLOC_USAGE_HW_COMPOSER);
67    mConsumer->setDefaultBufferFormat(mHwc.getFormat(disp));
68    mConsumer->setDefaultBufferSize(mHwc.getWidth(disp),  mHwc.getHeight(disp));
69    mConsumer->setDefaultMaxBufferCount(NUM_FRAMEBUFFER_SURFACE_BUFFERS);
70}
71
72status_t FramebufferSurface::beginFrame(bool /*mustRecompose*/) {
73    return NO_ERROR;
74}
75
76status_t FramebufferSurface::prepareFrame(CompositionType /*compositionType*/) {
77    return NO_ERROR;
78}
79
80status_t FramebufferSurface::advanceFrame() {
81    // Once we remove FB HAL support, we can call nextBuffer() from here
82    // instead of using onFrameAvailable(). No real benefit, except it'll be
83    // more like VirtualDisplaySurface.
84    return NO_ERROR;
85}
86
87status_t FramebufferSurface::nextBuffer(sp<GraphicBuffer>& outBuffer, sp<Fence>& outFence) {
88    Mutex::Autolock lock(mMutex);
89
90    BufferItem item;
91    status_t err = acquireBufferLocked(&item, 0);
92    if (err == BufferQueue::NO_BUFFER_AVAILABLE) {
93        outBuffer = mCurrentBuffer;
94        return NO_ERROR;
95    } else if (err != NO_ERROR) {
96        ALOGE("error acquiring buffer: %s (%d)", strerror(-err), err);
97        return err;
98    }
99
100    // If the BufferQueue has freed and reallocated a buffer in mCurrentSlot
101    // then we may have acquired the slot we already own.  If we had released
102    // our current buffer before we call acquireBuffer then that release call
103    // would have returned STALE_BUFFER_SLOT, and we would have called
104    // freeBufferLocked on that slot.  Because the buffer slot has already
105    // been overwritten with the new buffer all we have to do is skip the
106    // releaseBuffer call and we should be in the same state we'd be in if we
107    // had released the old buffer first.
108    if (mCurrentBufferSlot != BufferQueue::INVALID_BUFFER_SLOT &&
109        item.mSlot != mCurrentBufferSlot) {
110        // Release the previous buffer.
111        err = releaseBufferLocked(mCurrentBufferSlot, mCurrentBuffer,
112                EGL_NO_DISPLAY, EGL_NO_SYNC_KHR);
113        if (err < NO_ERROR) {
114            ALOGE("error releasing buffer: %s (%d)", strerror(-err), err);
115            return err;
116        }
117    }
118    mCurrentBufferSlot = item.mSlot;
119    mCurrentBuffer = mSlots[mCurrentBufferSlot].mGraphicBuffer;
120    outFence = item.mFence;
121    outBuffer = mCurrentBuffer;
122    return NO_ERROR;
123}
124
125// Overrides ConsumerBase::onFrameAvailable(), does not call base class impl.
126void FramebufferSurface::onFrameAvailable(const BufferItem& /* item */) {
127    sp<GraphicBuffer> buf;
128    sp<Fence> acquireFence;
129    status_t err = nextBuffer(buf, acquireFence);
130    if (err != NO_ERROR) {
131        ALOGE("error latching nnext FramebufferSurface buffer: %s (%d)",
132                strerror(-err), err);
133        return;
134    }
135    err = mHwc.fbPost(mDisplayType, acquireFence, buf);
136    if (err != NO_ERROR) {
137        ALOGE("error posting framebuffer: %d", err);
138    }
139}
140
141void FramebufferSurface::freeBufferLocked(int slotIndex) {
142    ConsumerBase::freeBufferLocked(slotIndex);
143    if (slotIndex == mCurrentBufferSlot) {
144        mCurrentBufferSlot = BufferQueue::INVALID_BUFFER_SLOT;
145    }
146}
147
148void FramebufferSurface::onFrameCommitted() {
149    sp<Fence> fence = mHwc.getAndResetReleaseFence(mDisplayType);
150    if (fence->isValid() &&
151            mCurrentBufferSlot != BufferQueue::INVALID_BUFFER_SLOT) {
152        status_t err = addReleaseFence(mCurrentBufferSlot,
153                mCurrentBuffer, fence);
154        ALOGE_IF(err, "setReleaseFenceFd: failed to add the fence: %s (%d)",
155                strerror(-err), err);
156    }
157}
158
159status_t FramebufferSurface::compositionComplete()
160{
161    return mHwc.fbCompositionComplete();
162}
163
164void FramebufferSurface::dumpAsString(String8& result) const {
165    ConsumerBase::dump(result);
166}
167
168void FramebufferSurface::dumpLocked(String8& result, const char* prefix) const
169{
170    mHwc.fbDump(result);
171    ConsumerBase::dumpLocked(result, prefix);
172}
173
174// ----------------------------------------------------------------------------
175}; // namespace android
176// ----------------------------------------------------------------------------
177