GraphicBuffer.cpp revision 2f3dca149a2bcae96f18e38f7ba99a95c3e1b08c 
1/*
2 * Copyright (C) 2007 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#define LOG_TAG "GraphicBuffer"
18
19#include <stdlib.h>
20#include <stdint.h>
21#include <sys/types.h>
22
23#include <utils/Errors.h>
24#include <utils/Log.h>
25
26#include <ui/GraphicBuffer.h>
27#include <ui/GraphicBufferAllocator.h>
28#include <ui/GraphicBufferMapper.h>
29#include <ui/PixelFormat.h>
30
31namespace android {
32
33// ===========================================================================
34// Buffer and implementation of ANativeWindowBuffer
35// ===========================================================================
36
37static uint64_t getUniqueId() {
38    static volatile int32_t nextId = 0;
39    uint64_t id = static_cast<uint64_t>(getpid()) << 32;
40    id |= static_cast<uint32_t>(android_atomic_inc(&nextId));
41    return id;
42}
43
44GraphicBuffer::GraphicBuffer()
45    : BASE(), mOwner(ownData), mBufferMapper(GraphicBufferMapper::get()),
46      mInitCheck(NO_ERROR), mId(getUniqueId())
47{
48    width  =
49    height =
50    stride =
51    format =
52    usage  = 0;
53    handle = NULL;
54}
55
56GraphicBuffer::GraphicBuffer(uint32_t w, uint32_t h,
57        PixelFormat reqFormat, uint32_t reqUsage)
58    : BASE(), mOwner(ownData), mBufferMapper(GraphicBufferMapper::get()),
59      mInitCheck(NO_ERROR), mId(getUniqueId())
60{
61    width  =
62    height =
63    stride =
64    format =
65    usage  = 0;
66    handle = NULL;
67    mInitCheck = initSize(w, h, reqFormat, reqUsage);
68}
69
70GraphicBuffer::GraphicBuffer(uint32_t w, uint32_t h,
71        PixelFormat inFormat, uint32_t inUsage,
72        uint32_t inStride, native_handle_t* inHandle, bool keepOwnership)
73    : BASE(), mOwner(keepOwnership ? ownHandle : ownNone),
74      mBufferMapper(GraphicBufferMapper::get()),
75      mInitCheck(NO_ERROR), mId(getUniqueId())
76{
77    width  = w;
78    height = h;
79    stride = inStride;
80    format = inFormat;
81    usage  = inUsage;
82    handle = inHandle;
83}
84
85GraphicBuffer::GraphicBuffer(ANativeWindowBuffer* buffer, bool keepOwnership)
86    : BASE(), mOwner(keepOwnership ? ownHandle : ownNone),
87      mBufferMapper(GraphicBufferMapper::get()),
88      mInitCheck(NO_ERROR), mWrappedBuffer(buffer), mId(getUniqueId())
89{
90    width  = buffer->width;
91    height = buffer->height;
92    stride = buffer->stride;
93    format = buffer->format;
94    usage  = buffer->usage;
95    handle = buffer->handle;
96}
97
98GraphicBuffer::~GraphicBuffer()
99{
100    if (handle) {
101        free_handle();
102    }
103}
104
105void GraphicBuffer::free_handle()
106{
107    if (mOwner == ownHandle) {
108        mBufferMapper.unregisterBuffer(handle);
109        native_handle_close(handle);
110        native_handle_delete(const_cast<native_handle*>(handle));
111    } else if (mOwner == ownData) {
112        GraphicBufferAllocator& allocator(GraphicBufferAllocator::get());
113        allocator.free(handle);
114    }
115    mWrappedBuffer = 0;
116}
117
118status_t GraphicBuffer::initCheck() const {
119    return mInitCheck;
120}
121
122void GraphicBuffer::dumpAllocationsToSystemLog()
123{
124    GraphicBufferAllocator::dumpToSystemLog();
125}
126
127ANativeWindowBuffer* GraphicBuffer::getNativeBuffer() const
128{
129    return static_cast<ANativeWindowBuffer*>(
130            const_cast<GraphicBuffer*>(this));
131}
132
133status_t GraphicBuffer::reallocate(uint32_t w, uint32_t h, PixelFormat f,
134        uint32_t reqUsage)
135{
136    if (mOwner != ownData)
137        return INVALID_OPERATION;
138
139    if (handle && w==width && h==height && f==format && reqUsage==usage)
140        return NO_ERROR;
141
142    if (handle) {
143        GraphicBufferAllocator& allocator(GraphicBufferAllocator::get());
144        allocator.free(handle);
145        handle = 0;
146    }
147    return initSize(w, h, f, reqUsage);
148}
149
150status_t GraphicBuffer::initSize(uint32_t w, uint32_t h, PixelFormat format,
151        uint32_t reqUsage)
152{
153    GraphicBufferAllocator& allocator = GraphicBufferAllocator::get();
154    status_t err = allocator.alloc(w, h, format, reqUsage, &handle, &stride);
155    if (err == NO_ERROR) {
156        this->width  = w;
157        this->height = h;
158        this->format = format;
159        this->usage  = reqUsage;
160    }
161    return err;
162}
163
164status_t GraphicBuffer::lock(uint32_t usage, void** vaddr)
165{
166    const Rect lockBounds(width, height);
167    status_t res = lock(usage, lockBounds, vaddr);
168    return res;
169}
170
171status_t GraphicBuffer::lock(uint32_t usage, const Rect& rect, void** vaddr)
172{
173    if (rect.left < 0 || rect.right  > this->width ||
174        rect.top  < 0 || rect.bottom > this->height) {
175        ALOGE("locking pixels (%d,%d,%d,%d) outside of buffer (w=%d, h=%d)",
176                rect.left, rect.top, rect.right, rect.bottom,
177                this->width, this->height);
178        return BAD_VALUE;
179    }
180    status_t res = getBufferMapper().lock(handle, usage, rect, vaddr);
181    return res;
182}
183
184status_t GraphicBuffer::lockYCbCr(uint32_t usage, android_ycbcr *ycbcr)
185{
186    const Rect lockBounds(width, height);
187    status_t res = lockYCbCr(usage, lockBounds, ycbcr);
188    return res;
189}
190
191status_t GraphicBuffer::lockYCbCr(uint32_t usage, const Rect& rect,
192        android_ycbcr *ycbcr)
193{
194    if (rect.left < 0 || rect.right  > this->width ||
195        rect.top  < 0 || rect.bottom > this->height) {
196        ALOGE("locking pixels (%d,%d,%d,%d) outside of buffer (w=%d, h=%d)",
197                rect.left, rect.top, rect.right, rect.bottom,
198                this->width, this->height);
199        return BAD_VALUE;
200    }
201    status_t res = getBufferMapper().lockYCbCr(handle, usage, rect, ycbcr);
202    return res;
203}
204
205status_t GraphicBuffer::unlock()
206{
207    status_t res = getBufferMapper().unlock(handle);
208    return res;
209}
210
211size_t GraphicBuffer::getFlattenedSize() const {
212    return (10 + (handle ? handle->numInts : 0))*sizeof(int);
213}
214
215size_t GraphicBuffer::getFdCount() const {
216    return handle ? handle->numFds : 0;
217}
218
219status_t GraphicBuffer::flatten(void*& buffer, size_t& size, int*& fds, size_t& count) const {
220    size_t sizeNeeded = GraphicBuffer::getFlattenedSize();
221    if (size < sizeNeeded) return NO_MEMORY;
222
223    size_t fdCountNeeded = GraphicBuffer::getFdCount();
224    if (count < fdCountNeeded) return NO_MEMORY;
225
226    int32_t* buf = static_cast<int32_t*>(buffer);
227    buf[0] = 'GBFR';
228    buf[1] = width;
229    buf[2] = height;
230    buf[3] = stride;
231    buf[4] = format;
232    buf[5] = usage;
233    buf[6] = static_cast<int32_t>(mId >> 32);
234    buf[7] = static_cast<int32_t>(mId & 0xFFFFFFFFull);
235    buf[8] = 0;
236    buf[9] = 0;
237
238    if (handle) {
239        buf[8] = handle->numFds;
240        buf[9] = handle->numInts;
241        native_handle_t const* const h = handle;
242        memcpy(fds,     h->data,             h->numFds*sizeof(int));
243        memcpy(&buf[10], h->data + h->numFds, h->numInts*sizeof(int));
244    }
245
246    buffer = reinterpret_cast<void*>(static_cast<int*>(buffer) + sizeNeeded);
247    size -= sizeNeeded;
248    if (handle) {
249        fds += handle->numFds;
250        count -= handle->numFds;
251    }
252
253    return NO_ERROR;
254}
255
256status_t GraphicBuffer::unflatten(
257        void const*& buffer, size_t& size, int const*& fds, size_t& count) {
258    if (size < 8*sizeof(int)) return NO_MEMORY;
259
260    int const* buf = static_cast<int const*>(buffer);
261    if (buf[0] != 'GBFR') return BAD_TYPE;
262
263    const size_t numFds  = buf[8];
264    const size_t numInts = buf[9];
265
266    const size_t sizeNeeded = (10 + numInts) * sizeof(int);
267    if (size < sizeNeeded) return NO_MEMORY;
268
269    size_t fdCountNeeded = 0;
270    if (count < fdCountNeeded) return NO_MEMORY;
271
272    if (handle) {
273        // free previous handle if any
274        free_handle();
275    }
276
277    if (numFds || numInts) {
278        width  = buf[1];
279        height = buf[2];
280        stride = buf[3];
281        format = buf[4];
282        usage  = buf[5];
283        native_handle* h = native_handle_create(numFds, numInts);
284        memcpy(h->data,          fds,     numFds*sizeof(int));
285        memcpy(h->data + numFds, &buf[10], numInts*sizeof(int));
286        handle = h;
287    } else {
288        width = height = stride = format = usage = 0;
289        handle = NULL;
290    }
291
292    mId = static_cast<uint64_t>(buf[6]) << 32;
293    mId |= static_cast<uint32_t>(buf[7]);
294
295    mOwner = ownHandle;
296
297    if (handle != 0) {
298        status_t err = mBufferMapper.registerBuffer(handle);
299        if (err != NO_ERROR) {
300            width = height = stride = format = usage = 0;
301            handle = NULL;
302            ALOGE("unflatten: registerBuffer failed: %s (%d)",
303                    strerror(-err), err);
304            return err;
305        }
306    }
307
308    buffer = reinterpret_cast<void const*>(static_cast<int const*>(buffer) + sizeNeeded);
309    size -= sizeNeeded;
310    fds += numFds;
311    count -= numFds;
312
313    return NO_ERROR;
314}
315
316// ---------------------------------------------------------------------------
317
318}; // namespace android
319