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 // ----------------------------------------------------------------------------
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
nextBuffer(sp<GraphicBuffer> & outBuffer,sp<Fence> & outFence)71 status_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.
onFrameAvailable()110 void 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
freeBufferLocked(int slotIndex)125 void FramebufferSurface::freeBufferLocked(int slotIndex) {
126 ConsumerBase::freeBufferLocked(slotIndex);
127 if (slotIndex == mCurrentBufferSlot) {
128 mCurrentBufferSlot = BufferQueue::INVALID_BUFFER_SLOT;
129 }
130 }
131
setReleaseFenceFd(int fenceFd)132 status_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
setUpdateRectangle(const Rect & r)145 status_t FramebufferSurface::setUpdateRectangle(const Rect& r)
146 {
147 return INVALID_OPERATION;
148 }
149
compositionComplete()150 status_t FramebufferSurface::compositionComplete()
151 {
152 return mHwc.fbCompositionComplete();
153 }
154
dump(String8 & result)155 void FramebufferSurface::dump(String8& result) {
156 mHwc.fbDump(result);
157 ConsumerBase::dump(result);
158 }
159
160 // ----------------------------------------------------------------------------
161 }; // namespace android
162 // ----------------------------------------------------------------------------
163