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#ifndef NUM_FRAMEBUFFER_SURFACE_BUFFERS
40#define NUM_FRAMEBUFFER_SURFACE_BUFFERS (2)
41#endif
42
43// ----------------------------------------------------------------------------
44namespace android {
45// ----------------------------------------------------------------------------
46
47/*
48 * This implements the (main) framebuffer management. This class is used
49 * mostly by SurfaceFlinger, but also by command line GL application.
50 *
51 */
52
53FramebufferSurface::FramebufferSurface(HWComposer& hwc, int disp) :
54    ConsumerBase(new BufferQueue(true, new GraphicBufferAlloc())),
55    mDisplayType(disp),
56    mCurrentBufferSlot(-1),
57    mCurrentBuffer(0),
58    mHwc(hwc)
59{
60    mName = "FramebufferSurface";
61    mBufferQueue->setConsumerName(mName);
62    mBufferQueue->setConsumerUsageBits(GRALLOC_USAGE_HW_FB |
63                                       GRALLOC_USAGE_HW_RENDER |
64                                       GRALLOC_USAGE_HW_COMPOSER);
65    mBufferQueue->setDefaultBufferFormat(mHwc.getFormat(disp));
66    mBufferQueue->setDefaultBufferSize(mHwc.getWidth(disp),  mHwc.getHeight(disp));
67    mBufferQueue->setSynchronousMode(true);
68    mBufferQueue->setDefaultMaxBufferCount(NUM_FRAMEBUFFER_SURFACE_BUFFERS);
69}
70
71status_t FramebufferSurface::nextBuffer(sp<GraphicBuffer>& outBuffer, sp<Fence>& outFence) {
72    Mutex::Autolock lock(mMutex);
73
74    BufferQueue::BufferItem item;
75    status_t err = acquireBufferLocked(&item);
76    if (err == BufferQueue::NO_BUFFER_AVAILABLE) {
77        outBuffer = mCurrentBuffer;
78        return NO_ERROR;
79    } else if (err != NO_ERROR) {
80        ALOGE("error acquiring buffer: %s (%d)", strerror(-err), err);
81        return err;
82    }
83
84    // If the BufferQueue has freed and reallocated a buffer in mCurrentSlot
85    // then we may have acquired the slot we already own.  If we had released
86    // our current buffer before we call acquireBuffer then that release call
87    // would have returned STALE_BUFFER_SLOT, and we would have called
88    // freeBufferLocked on that slot.  Because the buffer slot has already
89    // been overwritten with the new buffer all we have to do is skip the
90    // releaseBuffer call and we should be in the same state we'd be in if we
91    // had released the old buffer first.
92    if (mCurrentBufferSlot != BufferQueue::INVALID_BUFFER_SLOT &&
93        item.mBuf != mCurrentBufferSlot) {
94        // Release the previous buffer.
95        err = releaseBufferLocked(mCurrentBufferSlot, EGL_NO_DISPLAY,
96                EGL_NO_SYNC_KHR);
97        if (err != NO_ERROR && err != BufferQueue::STALE_BUFFER_SLOT) {
98            ALOGE("error releasing buffer: %s (%d)", strerror(-err), err);
99            return err;
100        }
101    }
102    mCurrentBufferSlot = item.mBuf;
103    mCurrentBuffer = mSlots[mCurrentBufferSlot].mGraphicBuffer;
104    outFence = item.mFence;
105    outBuffer = mCurrentBuffer;
106    return NO_ERROR;
107}
108
109// Overrides ConsumerBase::onFrameAvailable(), does not call base class impl.
110void FramebufferSurface::onFrameAvailable() {
111    sp<GraphicBuffer> buf;
112    sp<Fence> acquireFence;
113    status_t err = nextBuffer(buf, acquireFence);
114    if (err != NO_ERROR) {
115        ALOGE("error latching nnext FramebufferSurface buffer: %s (%d)",
116                strerror(-err), err);
117        return;
118    }
119    err = mHwc.fbPost(mDisplayType, acquireFence, buf);
120    if (err != NO_ERROR) {
121        ALOGE("error posting framebuffer: %d", err);
122    }
123}
124
125void FramebufferSurface::freeBufferLocked(int slotIndex) {
126    ConsumerBase::freeBufferLocked(slotIndex);
127    if (slotIndex == mCurrentBufferSlot) {
128        mCurrentBufferSlot = BufferQueue::INVALID_BUFFER_SLOT;
129    }
130}
131
132status_t FramebufferSurface::setReleaseFenceFd(int fenceFd) {
133    status_t err = NO_ERROR;
134    if (fenceFd >= 0) {
135        sp<Fence> fence(new Fence(fenceFd));
136        if (mCurrentBufferSlot != BufferQueue::INVALID_BUFFER_SLOT) {
137            status_t err = addReleaseFence(mCurrentBufferSlot, fence);
138            ALOGE_IF(err, "setReleaseFenceFd: failed to add the fence: %s (%d)",
139                    strerror(-err), err);
140        }
141    }
142    return err;
143}
144
145status_t FramebufferSurface::setUpdateRectangle(const Rect& r)
146{
147    return INVALID_OPERATION;
148}
149
150status_t FramebufferSurface::compositionComplete()
151{
152    return mHwc.fbCompositionComplete();
153}
154
155void FramebufferSurface::dump(String8& result) {
156    mHwc.fbDump(result);
157    ConsumerBase::dump(result);
158}
159
160// ----------------------------------------------------------------------------
161}; // namespace android
162// ----------------------------------------------------------------------------
163