FramebufferSurface.cpp revision db27621e22559a1b16414f890677ef04242fbc3b 
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/HWComposer.h"
37
38// ----------------------------------------------------------------------------
39namespace android {
40// ----------------------------------------------------------------------------
41
42class GraphicBufferAlloc : public BnGraphicBufferAlloc {
43public:
44    GraphicBufferAlloc() { };
45    virtual ~GraphicBufferAlloc() { };
46    virtual sp<GraphicBuffer> createGraphicBuffer(uint32_t w, uint32_t h,
47            PixelFormat format, uint32_t usage, status_t* error) {
48        sp<GraphicBuffer> graphicBuffer(new GraphicBuffer(w, h, format, usage));
49        return graphicBuffer;
50    }
51};
52
53
54/*
55 * This implements the (main) framebuffer management. This class is used
56 * mostly by SurfaceFlinger, but also by command line GL application.
57 *
58 */
59
60FramebufferSurface::FramebufferSurface(HWComposer& hwc) :
61    ConsumerBase(new BufferQueue(true, new GraphicBufferAlloc())),
62    mCurrentBufferSlot(-1),
63    mCurrentBuffer(0),
64    mHwc(hwc)
65{
66    mName = "FramebufferSurface";
67    mBufferQueue->setConsumerName(mName);
68    mBufferQueue->setConsumerUsageBits(GRALLOC_USAGE_HW_FB |
69                                       GRALLOC_USAGE_HW_RENDER | GRALLOC_USAGE_HW_COMPOSER);
70    mBufferQueue->setDefaultBufferFormat(mHwc.getFormat(HWC_DISPLAY_PRIMARY));
71    mBufferQueue->setDefaultBufferSize(mHwc.getWidth(HWC_DISPLAY_PRIMARY),
72                                       mHwc.getHeight(HWC_DISPLAY_PRIMARY));
73    mBufferQueue->setSynchronousMode(true);
74    mBufferQueue->setDefaultMaxBufferCount(NUM_FRAME_BUFFERS);
75}
76
77status_t FramebufferSurface::nextBuffer(sp<GraphicBuffer>* buffer) {
78    Mutex::Autolock lock(mMutex);
79
80    BufferQueue::BufferItem item;
81    status_t err = acquireBufferLocked(&item);
82    if (err == BufferQueue::NO_BUFFER_AVAILABLE) {
83        if (buffer != NULL) {
84            *buffer = mCurrentBuffer;
85        }
86        return NO_ERROR;
87    } else if (err != NO_ERROR) {
88        ALOGE("error acquiring buffer: %s (%d)", strerror(-err), err);
89        return err;
90    }
91
92    // If the BufferQueue has freed and reallocated a buffer in mCurrentSlot
93    // then we may have acquired the slot we already own.  If we had released
94    // our current buffer before we call acquireBuffer then that release call
95    // would have returned STALE_BUFFER_SLOT, and we would have called
96    // freeBufferLocked on that slot.  Because the buffer slot has already
97    // been overwritten with the new buffer all we have to do is skip the
98    // releaseBuffer call and we should be in the same state we'd be in if we
99    // had released the old buffer first.
100    if (mCurrentBufferSlot != BufferQueue::INVALID_BUFFER_SLOT &&
101        item.mBuf != mCurrentBufferSlot) {
102        // Release the previous buffer.
103        err = releaseBufferLocked(mCurrentBufferSlot, EGL_NO_DISPLAY,
104                EGL_NO_SYNC_KHR);
105        if (err != NO_ERROR && err != BufferQueue::STALE_BUFFER_SLOT) {
106            ALOGE("error releasing buffer: %s (%d)", strerror(-err), err);
107            return err;
108        }
109    }
110
111    mCurrentBufferSlot = item.mBuf;
112    mCurrentBuffer = mSlots[mCurrentBufferSlot].mGraphicBuffer;
113    if (item.mFence != NULL) {
114        item.mFence->wait(Fence::TIMEOUT_NEVER);
115    }
116
117    if (buffer != NULL) {
118        *buffer = mCurrentBuffer;
119    }
120
121    return NO_ERROR;
122}
123
124// Overrides ConsumerBase::onFrameAvailable(), does not call base class impl.
125void FramebufferSurface::onFrameAvailable() {
126    // XXX: The following code is here temporarily as part of the transition
127    // away from the framebuffer HAL.
128    sp<GraphicBuffer> buf;
129    status_t err = nextBuffer(&buf);
130    if (err != NO_ERROR) {
131        ALOGE("error latching next FramebufferSurface buffer: %s (%d)",
132                strerror(-err), err);
133        return;
134    }
135    err = mHwc.fbPost(buf->handle);
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
148status_t FramebufferSurface::setUpdateRectangle(const Rect& r)
149{
150    return INVALID_OPERATION;
151}
152
153status_t FramebufferSurface::compositionComplete()
154{
155    return mHwc.fbCompositionComplete();
156}
157
158void FramebufferSurface::dump(String8& result) {
159    mHwc.fbDump(result);
160    ConsumerBase::dump(result);
161}
162
163// ----------------------------------------------------------------------------
164}; // namespace android
165// ----------------------------------------------------------------------------
166