BufferItem.cpp revision 063121849890da78b1ad7fb96c54c795de5d1fd6 
1/*
2 * Copyright 2014 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#include <gui/BufferItem.h>
18
19#include <ui/Fence.h>
20#include <ui/GraphicBuffer.h>
21
22#include <system/window.h>
23
24namespace android {
25
26BufferItem::BufferItem() :
27    mGraphicBuffer(NULL),
28    mFence(NULL),
29    mCrop(Rect::INVALID_RECT),
30    mTransform(0),
31    mScalingMode(NATIVE_WINDOW_SCALING_MODE_FREEZE),
32    mTimestamp(0),
33    mIsAutoTimestamp(false),
34    mDataSpace(HAL_DATASPACE_UNKNOWN),
35    mFrameNumber(0),
36    mSlot(INVALID_BUFFER_SLOT),
37    mIsDroppable(false),
38    mAcquireCalled(false),
39    mTransformToDisplayInverse(false),
40    mSurfaceDamage(),
41    mSingleBufferMode(false),
42    mQueuedBuffer(true) {
43}
44
45BufferItem::~BufferItem() {}
46
47template <typename T>
48static void addAligned(size_t& size, T /* value */) {
49    size = FlattenableUtils::align<sizeof(T)>(size);
50    size += sizeof(T);
51}
52
53size_t BufferItem::getPodSize() const {
54    size_t size = 0;
55    addAligned(size, mCrop);
56    addAligned(size, mTransform);
57    addAligned(size, mScalingMode);
58    addAligned(size, mTimestampLo);
59    addAligned(size, mTimestampHi);
60    addAligned(size, mIsAutoTimestamp);
61    addAligned(size, mDataSpace);
62    addAligned(size, mFrameNumberLo);
63    addAligned(size, mFrameNumberHi);
64    addAligned(size, mSlot);
65    addAligned(size, mIsDroppable);
66    addAligned(size, mAcquireCalled);
67    addAligned(size, mTransformToDisplayInverse);
68    return size;
69}
70
71size_t BufferItem::getFlattenedSize() const {
72    size_t size = sizeof(uint32_t); // Flags
73    if (mGraphicBuffer != 0) {
74        size += mGraphicBuffer->getFlattenedSize();
75        FlattenableUtils::align<4>(size);
76    }
77    if (mFence != 0) {
78        size += mFence->getFlattenedSize();
79        FlattenableUtils::align<4>(size);
80    }
81    size += mSurfaceDamage.getFlattenedSize();
82    size = FlattenableUtils::align<8>(size);
83    return size + getPodSize();
84}
85
86size_t BufferItem::getFdCount() const {
87    size_t count = 0;
88    if (mGraphicBuffer != 0) {
89        count += mGraphicBuffer->getFdCount();
90    }
91    if (mFence != 0) {
92        count += mFence->getFdCount();
93    }
94    return count;
95}
96
97template <typename T>
98static void writeAligned(void*& buffer, size_t& size, T value) {
99    size -= FlattenableUtils::align<alignof(T)>(buffer);
100    FlattenableUtils::write(buffer, size, value);
101}
102
103status_t BufferItem::flatten(
104        void*& buffer, size_t& size, int*& fds, size_t& count) const {
105
106    // make sure we have enough space
107    if (size < BufferItem::getFlattenedSize()) {
108        return NO_MEMORY;
109    }
110
111    // content flags are stored first
112    uint32_t& flags = *static_cast<uint32_t*>(buffer);
113
114    // advance the pointer
115    FlattenableUtils::advance(buffer, size, sizeof(uint32_t));
116
117    flags = 0;
118    if (mGraphicBuffer != 0) {
119        status_t err = mGraphicBuffer->flatten(buffer, size, fds, count);
120        if (err) return err;
121        size -= FlattenableUtils::align<4>(buffer);
122        flags |= 1;
123    }
124    if (mFence != 0) {
125        status_t err = mFence->flatten(buffer, size, fds, count);
126        if (err) return err;
127        size -= FlattenableUtils::align<4>(buffer);
128        flags |= 2;
129    }
130
131    status_t err = mSurfaceDamage.flatten(buffer, size);
132    if (err) return err;
133    FlattenableUtils::advance(buffer, size, mSurfaceDamage.getFlattenedSize());
134
135    // Check we still have enough space
136    if (size < getPodSize()) {
137        return NO_MEMORY;
138    }
139
140    writeAligned(buffer, size, mCrop);
141    writeAligned(buffer, size, mTransform);
142    writeAligned(buffer, size, mScalingMode);
143    writeAligned(buffer, size, mTimestampLo);
144    writeAligned(buffer, size, mTimestampHi);
145    writeAligned(buffer, size, mIsAutoTimestamp);
146    writeAligned(buffer, size, mDataSpace);
147    writeAligned(buffer, size, mFrameNumberLo);
148    writeAligned(buffer, size, mFrameNumberHi);
149    writeAligned(buffer, size, mSlot);
150    writeAligned(buffer, size, mIsDroppable);
151    writeAligned(buffer, size, mAcquireCalled);
152    writeAligned(buffer, size, mTransformToDisplayInverse);
153
154    return NO_ERROR;
155}
156
157template <typename T>
158static void readAligned(const void*& buffer, size_t& size, T& value) {
159    size -= FlattenableUtils::align<alignof(T)>(buffer);
160    FlattenableUtils::read(buffer, size, value);
161}
162
163status_t BufferItem::unflatten(
164        void const*& buffer, size_t& size, int const*& fds, size_t& count) {
165
166    if (size < sizeof(uint32_t)) {
167        return NO_MEMORY;
168    }
169
170    uint32_t flags = 0;
171    FlattenableUtils::read(buffer, size, flags);
172
173    if (flags & 1) {
174        mGraphicBuffer = new GraphicBuffer();
175        status_t err = mGraphicBuffer->unflatten(buffer, size, fds, count);
176        if (err) return err;
177        size -= FlattenableUtils::align<4>(buffer);
178    }
179
180    if (flags & 2) {
181        mFence = new Fence();
182        status_t err = mFence->unflatten(buffer, size, fds, count);
183        if (err) return err;
184        size -= FlattenableUtils::align<4>(buffer);
185    }
186
187    status_t err = mSurfaceDamage.unflatten(buffer, size);
188    if (err) return err;
189    FlattenableUtils::advance(buffer, size, mSurfaceDamage.getFlattenedSize());
190
191    // Check we still have enough space
192    if (size < getPodSize()) {
193        return NO_MEMORY;
194    }
195
196    readAligned(buffer, size, mCrop);
197    readAligned(buffer, size, mTransform);
198    readAligned(buffer, size, mScalingMode);
199    readAligned(buffer, size, mTimestampLo);
200    readAligned(buffer, size, mTimestampHi);
201    readAligned(buffer, size, mIsAutoTimestamp);
202    readAligned(buffer, size, mDataSpace);
203    readAligned(buffer, size, mFrameNumberLo);
204    readAligned(buffer, size, mFrameNumberHi);
205    readAligned(buffer, size, mSlot);
206    readAligned(buffer, size, mIsDroppable);
207    readAligned(buffer, size, mAcquireCalled);
208    readAligned(buffer, size, mTransformToDisplayInverse);
209
210    return NO_ERROR;
211}
212
213const char* BufferItem::scalingModeName(uint32_t scalingMode) {
214    switch (scalingMode) {
215        case NATIVE_WINDOW_SCALING_MODE_FREEZE: return "FREEZE";
216        case NATIVE_WINDOW_SCALING_MODE_SCALE_TO_WINDOW: return "SCALE_TO_WINDOW";
217        case NATIVE_WINDOW_SCALING_MODE_SCALE_CROP: return "SCALE_CROP";
218        default: return "Unknown";
219    }
220}
221
222} // namespace android
223