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,const sp<IGraphicBufferConsumer> & consumer)53 FramebufferSurface::FramebufferSurface(HWComposer& hwc, int disp,
54 const sp<IGraphicBufferConsumer>& consumer) :
55 ConsumerBase(consumer),
56 mDisplayType(disp),
57 mCurrentBufferSlot(-1),
58 mCurrentBuffer(0),
59 mHwc(hwc)
60 {
61 mName = "FramebufferSurface";
62 mConsumer->setConsumerName(mName);
63 mConsumer->setConsumerUsageBits(GRALLOC_USAGE_HW_FB |
64 GRALLOC_USAGE_HW_RENDER |
65 GRALLOC_USAGE_HW_COMPOSER);
66 mConsumer->setDefaultBufferFormat(mHwc.getFormat(disp));
67 mConsumer->setDefaultBufferSize(mHwc.getWidth(disp), mHwc.getHeight(disp));
68 mConsumer->setDefaultMaxBufferCount(NUM_FRAMEBUFFER_SURFACE_BUFFERS);
69 }
70
beginFrame()71 status_t FramebufferSurface::beginFrame() {
72 return NO_ERROR;
73 }
74
prepareFrame(CompositionType compositionType)75 status_t FramebufferSurface::prepareFrame(CompositionType compositionType) {
76 return NO_ERROR;
77 }
78
advanceFrame()79 status_t FramebufferSurface::advanceFrame() {
80 // Once we remove FB HAL support, we can call nextBuffer() from here
81 // instead of using onFrameAvailable(). No real benefit, except it'll be
82 // more like VirtualDisplaySurface.
83 return NO_ERROR;
84 }
85
nextBuffer(sp<GraphicBuffer> & outBuffer,sp<Fence> & outFence)86 status_t FramebufferSurface::nextBuffer(sp<GraphicBuffer>& outBuffer, sp<Fence>& outFence) {
87 Mutex::Autolock lock(mMutex);
88
89 BufferQueue::BufferItem item;
90 status_t err = acquireBufferLocked(&item, 0);
91 if (err == BufferQueue::NO_BUFFER_AVAILABLE) {
92 outBuffer = mCurrentBuffer;
93 return NO_ERROR;
94 } else if (err != NO_ERROR) {
95 ALOGE("error acquiring buffer: %s (%d)", strerror(-err), err);
96 return err;
97 }
98
99 // If the BufferQueue has freed and reallocated a buffer in mCurrentSlot
100 // then we may have acquired the slot we already own. If we had released
101 // our current buffer before we call acquireBuffer then that release call
102 // would have returned STALE_BUFFER_SLOT, and we would have called
103 // freeBufferLocked on that slot. Because the buffer slot has already
104 // been overwritten with the new buffer all we have to do is skip the
105 // releaseBuffer call and we should be in the same state we'd be in if we
106 // had released the old buffer first.
107 if (mCurrentBufferSlot != BufferQueue::INVALID_BUFFER_SLOT &&
108 item.mBuf != mCurrentBufferSlot) {
109 // Release the previous buffer.
110 err = releaseBufferLocked(mCurrentBufferSlot, mCurrentBuffer,
111 EGL_NO_DISPLAY, EGL_NO_SYNC_KHR);
112 if (err < NO_ERROR) {
113 ALOGE("error releasing buffer: %s (%d)", strerror(-err), err);
114 return err;
115 }
116 }
117 mCurrentBufferSlot = item.mBuf;
118 mCurrentBuffer = mSlots[mCurrentBufferSlot].mGraphicBuffer;
119 outFence = item.mFence;
120 outBuffer = mCurrentBuffer;
121 return NO_ERROR;
122 }
123
124 // Overrides ConsumerBase::onFrameAvailable(), does not call base class impl.
onFrameAvailable()125 void FramebufferSurface::onFrameAvailable() {
126 sp<GraphicBuffer> buf;
127 sp<Fence> acquireFence;
128 status_t err = nextBuffer(buf, acquireFence);
129 if (err != NO_ERROR) {
130 ALOGE("error latching nnext FramebufferSurface buffer: %s (%d)",
131 strerror(-err), err);
132 return;
133 }
134 err = mHwc.fbPost(mDisplayType, acquireFence, buf);
135 if (err != NO_ERROR) {
136 ALOGE("error posting framebuffer: %d", err);
137 }
138 }
139
freeBufferLocked(int slotIndex)140 void FramebufferSurface::freeBufferLocked(int slotIndex) {
141 ConsumerBase::freeBufferLocked(slotIndex);
142 if (slotIndex == mCurrentBufferSlot) {
143 mCurrentBufferSlot = BufferQueue::INVALID_BUFFER_SLOT;
144 }
145 }
146
onFrameCommitted()147 void FramebufferSurface::onFrameCommitted() {
148 sp<Fence> fence = mHwc.getAndResetReleaseFence(mDisplayType);
149 if (fence->isValid() &&
150 mCurrentBufferSlot != BufferQueue::INVALID_BUFFER_SLOT) {
151 status_t err = addReleaseFence(mCurrentBufferSlot,
152 mCurrentBuffer, fence);
153 ALOGE_IF(err, "setReleaseFenceFd: failed to add the fence: %s (%d)",
154 strerror(-err), err);
155 }
156 }
157
compositionComplete()158 status_t FramebufferSurface::compositionComplete()
159 {
160 return mHwc.fbCompositionComplete();
161 }
162
163 // Since DisplaySurface and ConsumerBase both have a method with this
164 // signature, results will vary based on the static pointer type the caller is
165 // using:
166 // void dump(FrameBufferSurface* fbs, String8& s) {
167 // // calls FramebufferSurface::dump()
168 // fbs->dump(s);
169 //
170 // // calls ConsumerBase::dump() since it is non-virtual
171 // static_cast<ConsumerBase*>(fbs)->dump(s);
172 //
173 // // calls FramebufferSurface::dump() since it is virtual
174 // static_cast<DisplaySurface*>(fbs)->dump(s);
175 // }
176 // To make sure that all of these end up doing the same thing, we just redirect
177 // to ConsumerBase::dump() here. It will take the internal lock, and then call
178 // virtual dumpLocked(), which is where the real work happens.
dump(String8 & result) const179 void FramebufferSurface::dump(String8& result) const {
180 ConsumerBase::dump(result);
181 }
182
dumpLocked(String8 & result,const char * prefix) const183 void FramebufferSurface::dumpLocked(String8& result, const char* prefix) const
184 {
185 mHwc.fbDump(result);
186 ConsumerBase::dumpLocked(result, prefix);
187 }
188
189 // ----------------------------------------------------------------------------
190 }; // namespace android
191 // ----------------------------------------------------------------------------
192