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/Surface.h>
33 #include <gui/GraphicBufferAlloc.h>
34 #include <ui/GraphicBuffer.h>
35
36 #include "FramebufferSurface.h"
37 #include "HWComposer.h"
38
39 #ifndef NUM_FRAMEBUFFER_SURFACE_BUFFERS
40 #define NUM_FRAMEBUFFER_SURFACE_BUFFERS (2)
41 #endif
42
43 // ----------------------------------------------------------------------------
44 namespace 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
FramebufferSurface(HWComposer & hwc,int disp)53 FramebufferSurface::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
getIGraphicBufferProducer() const71 sp<IGraphicBufferProducer> FramebufferSurface::getIGraphicBufferProducer() const {
72 return getBufferQueue();
73 }
74
advanceFrame()75 status_t FramebufferSurface::advanceFrame() {
76 // Once we remove FB HAL support, we can call nextBuffer() from here
77 // instead of using onFrameAvailable(). No real benefit, except it'll be
78 // more like VirtualDisplaySurface.
79 return NO_ERROR;
80 }
81
nextBuffer(sp<GraphicBuffer> & outBuffer,sp<Fence> & outFence)82 status_t FramebufferSurface::nextBuffer(sp<GraphicBuffer>& outBuffer, sp<Fence>& outFence) {
83 Mutex::Autolock lock(mMutex);
84
85 BufferQueue::BufferItem item;
86 status_t err = acquireBufferLocked(&item);
87 if (err == BufferQueue::NO_BUFFER_AVAILABLE) {
88 outBuffer = mCurrentBuffer;
89 return NO_ERROR;
90 } else if (err != NO_ERROR) {
91 ALOGE("error acquiring buffer: %s (%d)", strerror(-err), err);
92 return err;
93 }
94
95 // If the BufferQueue has freed and reallocated a buffer in mCurrentSlot
96 // then we may have acquired the slot we already own. If we had released
97 // our current buffer before we call acquireBuffer then that release call
98 // would have returned STALE_BUFFER_SLOT, and we would have called
99 // freeBufferLocked on that slot. Because the buffer slot has already
100 // been overwritten with the new buffer all we have to do is skip the
101 // releaseBuffer call and we should be in the same state we'd be in if we
102 // had released the old buffer first.
103 if (mCurrentBufferSlot != BufferQueue::INVALID_BUFFER_SLOT &&
104 item.mBuf != mCurrentBufferSlot) {
105 // Release the previous buffer.
106 err = releaseBufferLocked(mCurrentBufferSlot, EGL_NO_DISPLAY,
107 EGL_NO_SYNC_KHR);
108 if (err != NO_ERROR && err != BufferQueue::STALE_BUFFER_SLOT) {
109 ALOGE("error releasing buffer: %s (%d)", strerror(-err), err);
110 return err;
111 }
112 }
113 mCurrentBufferSlot = item.mBuf;
114 mCurrentBuffer = mSlots[mCurrentBufferSlot].mGraphicBuffer;
115 outFence = item.mFence;
116 outBuffer = mCurrentBuffer;
117 return NO_ERROR;
118 }
119
120 // Overrides ConsumerBase::onFrameAvailable(), does not call base class impl.
onFrameAvailable()121 void FramebufferSurface::onFrameAvailable() {
122 sp<GraphicBuffer> buf;
123 sp<Fence> acquireFence;
124 status_t err = nextBuffer(buf, acquireFence);
125 if (err != NO_ERROR) {
126 ALOGE("error latching nnext FramebufferSurface buffer: %s (%d)",
127 strerror(-err), err);
128 return;
129 }
130 err = mHwc.fbPost(mDisplayType, acquireFence, buf);
131 if (err != NO_ERROR) {
132 ALOGE("error posting framebuffer: %d", err);
133 }
134 }
135
freeBufferLocked(int slotIndex)136 void FramebufferSurface::freeBufferLocked(int slotIndex) {
137 ConsumerBase::freeBufferLocked(slotIndex);
138 if (slotIndex == mCurrentBufferSlot) {
139 mCurrentBufferSlot = BufferQueue::INVALID_BUFFER_SLOT;
140 }
141 }
142
onFrameCommitted()143 void FramebufferSurface::onFrameCommitted() {
144 sp<Fence> fence = mHwc.getAndResetReleaseFence(mDisplayType);
145 if (fence->isValid() &&
146 mCurrentBufferSlot != BufferQueue::INVALID_BUFFER_SLOT) {
147 status_t err = addReleaseFence(mCurrentBufferSlot, fence);
148 ALOGE_IF(err, "setReleaseFenceFd: failed to add the fence: %s (%d)",
149 strerror(-err), err);
150 }
151 }
152
compositionComplete()153 status_t FramebufferSurface::compositionComplete()
154 {
155 return mHwc.fbCompositionComplete();
156 }
157
158 // Since DisplaySurface and ConsumerBase both have a method with this
159 // signature, results will vary based on the static pointer type the caller is
160 // using:
161 // void dump(FrameBufferSurface* fbs, String8& s) {
162 // // calls FramebufferSurface::dump()
163 // fbs->dump(s);
164 //
165 // // calls ConsumerBase::dump() since it is non-virtual
166 // static_cast<ConsumerBase*>(fbs)->dump(s);
167 //
168 // // calls FramebufferSurface::dump() since it is virtual
169 // static_cast<DisplaySurface*>(fbs)->dump(s);
170 // }
171 // To make sure that all of these end up doing the same thing, we just redirect
172 // to ConsumerBase::dump() here. It will take the internal lock, and then call
173 // virtual dumpLocked(), which is where the real work happens.
dump(String8 & result) const174 void FramebufferSurface::dump(String8& result) const {
175 ConsumerBase::dump(result);
176 }
177
dumpLocked(String8 & result,const char * prefix,char * buffer,size_t SIZE) const178 void FramebufferSurface::dumpLocked(String8& result, const char* prefix,
179 char* buffer, size_t SIZE) const
180 {
181 mHwc.fbDump(result);
182 ConsumerBase::dumpLocked(result, prefix, buffer, SIZE);
183 }
184
185 // ----------------------------------------------------------------------------
186 }; // namespace android
187 // ----------------------------------------------------------------------------
188