GraphicBuffer.cpp revision 5e14010b1fc066dfcbc0a577d59492687c99667d 
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
31#include <pixelflinger/pixelflinger.h>
32
33namespace android {
34
35// ===========================================================================
36// Buffer and implementation of android_native_buffer_t
37// ===========================================================================
38
39GraphicBuffer::GraphicBuffer()
40    : BASE(), mOwner(ownData), mBufferMapper(GraphicBufferMapper::get()),
41      mInitCheck(NO_ERROR), mIndex(-1)
42{
43    width  =
44    height =
45    stride =
46    format =
47    usage  = 0;
48    handle = NULL;
49}
50
51GraphicBuffer::GraphicBuffer(uint32_t w, uint32_t h,
52        PixelFormat reqFormat, uint32_t reqUsage)
53    : BASE(), mOwner(ownData), mBufferMapper(GraphicBufferMapper::get()),
54      mInitCheck(NO_ERROR), mIndex(-1)
55{
56    width  =
57    height =
58    stride =
59    format =
60    usage  = 0;
61    handle = NULL;
62    mInitCheck = initSize(w, h, reqFormat, reqUsage);
63}
64
65GraphicBuffer::GraphicBuffer(uint32_t w, uint32_t h,
66        PixelFormat inFormat, uint32_t inUsage,
67        uint32_t inStride, native_handle_t* inHandle, bool keepOwnership)
68    : BASE(), mOwner(keepOwnership ? ownHandle : ownNone),
69      mBufferMapper(GraphicBufferMapper::get()),
70      mInitCheck(NO_ERROR), mIndex(-1)
71{
72    width  = w;
73    height = h;
74    stride = inStride;
75    format = inFormat;
76    usage  = inUsage;
77    handle = inHandle;
78}
79
80GraphicBuffer::~GraphicBuffer()
81{
82    if (handle) {
83        free_handle();
84    }
85}
86
87void GraphicBuffer::free_handle()
88{
89    if (mOwner == ownHandle) {
90        native_handle_close(handle);
91        native_handle_delete(const_cast<native_handle*>(handle));
92    } else if (mOwner == ownData) {
93        GraphicBufferAllocator& allocator(GraphicBufferAllocator::get());
94        allocator.free(handle);
95    }
96}
97
98status_t GraphicBuffer::initCheck() const {
99    return mInitCheck;
100}
101
102android_native_buffer_t* GraphicBuffer::getNativeBuffer() const
103{
104    return static_cast<android_native_buffer_t*>(
105            const_cast<GraphicBuffer*>(this));
106}
107
108status_t GraphicBuffer::reallocate(uint32_t w, uint32_t h, PixelFormat f,
109        uint32_t reqUsage)
110{
111    if (mOwner != ownData)
112        return INVALID_OPERATION;
113
114    if (handle && w==width && h==height && f==format && reqUsage==usage)
115        return NO_ERROR;
116
117    if (handle) {
118        GraphicBufferAllocator& allocator(GraphicBufferAllocator::get());
119        allocator.free(handle);
120        handle = 0;
121    }
122    return initSize(w, h, f, reqUsage);
123}
124
125status_t GraphicBuffer::initSize(uint32_t w, uint32_t h, PixelFormat format,
126        uint32_t reqUsage)
127{
128    GraphicBufferAllocator& allocator = GraphicBufferAllocator::get();
129    status_t err = allocator.alloc(w, h, format, reqUsage, &handle, &stride);
130
131    if (err<0 && format == PIXEL_FORMAT_RGBX_8888) {
132        /*
133         * There is currently a bug with some gralloc implementations
134         * not supporting RGBX_8888. In this case, we revert to using RGBA_8888
135         * which is not exactly the same, as GL_REPLACE will yield a different
136         * result.
137         */
138        format = PIXEL_FORMAT_RGBA_8888;
139        err = allocator.alloc(w, h, format, reqUsage, &handle, &stride);
140    }
141
142    if (err == NO_ERROR) {
143        this->width  = w;
144        this->height = h;
145        this->format = format;
146        this->usage  = reqUsage;
147    }
148    return err;
149}
150
151status_t GraphicBuffer::lock(uint32_t usage, void** vaddr)
152{
153    const Rect lockBounds(width, height);
154    status_t res = lock(usage, lockBounds, vaddr);
155    return res;
156}
157
158status_t GraphicBuffer::lock(uint32_t usage, const Rect& rect, void** vaddr)
159{
160    if (rect.left < 0 || rect.right  > this->width ||
161        rect.top  < 0 || rect.bottom > this->height) {
162        LOGE("locking pixels (%d,%d,%d,%d) outside of buffer (w=%d, h=%d)",
163                rect.left, rect.top, rect.right, rect.bottom,
164                this->width, this->height);
165        return BAD_VALUE;
166    }
167    status_t res = getBufferMapper().lock(handle, usage, rect, vaddr);
168    return res;
169}
170
171status_t GraphicBuffer::unlock()
172{
173    status_t res = getBufferMapper().unlock(handle);
174    return res;
175}
176
177status_t GraphicBuffer::lock(GGLSurface* sur, uint32_t usage)
178{
179    void* vaddr;
180    status_t res = GraphicBuffer::lock(usage, &vaddr);
181    if (res == NO_ERROR && sur) {
182        sur->version = sizeof(GGLSurface);
183        sur->width = width;
184        sur->height = height;
185        sur->stride = stride;
186        sur->format = format;
187        sur->data = static_cast<GGLubyte*>(vaddr);
188    }
189    return res;
190}
191
192size_t GraphicBuffer::getFlattenedSize() const {
193    return (8 + (handle ? handle->numInts : 0))*sizeof(int);
194}
195
196size_t GraphicBuffer::getFdCount() const {
197    return handle ? handle->numFds : 0;
198}
199
200status_t GraphicBuffer::flatten(void* buffer, size_t size,
201        int fds[], size_t count) const
202{
203    size_t sizeNeeded = GraphicBuffer::getFlattenedSize();
204    if (size < sizeNeeded) return NO_MEMORY;
205
206    size_t fdCountNeeded = GraphicBuffer::getFdCount();
207    if (count < fdCountNeeded) return NO_MEMORY;
208
209    int* buf = static_cast<int*>(buffer);
210    buf[0] = 'GBFR';
211    buf[1] = width;
212    buf[2] = height;
213    buf[3] = stride;
214    buf[4] = format;
215    buf[5] = usage;
216    buf[6] = 0;
217    buf[7] = 0;
218
219    if (handle) {
220        buf[6] = handle->numFds;
221        buf[7] = handle->numInts;
222        native_handle_t const* const h = handle;
223        memcpy(fds,     h->data,             h->numFds*sizeof(int));
224        memcpy(&buf[8], h->data + h->numFds, h->numInts*sizeof(int));
225    }
226
227    return NO_ERROR;
228}
229
230status_t GraphicBuffer::unflatten(void const* buffer, size_t size,
231        int fds[], size_t count)
232{
233    if (size < 8*sizeof(int)) return NO_MEMORY;
234
235    int const* buf = static_cast<int const*>(buffer);
236    if (buf[0] != 'GBFR') return BAD_TYPE;
237
238    const size_t numFds  = buf[6];
239    const size_t numInts = buf[7];
240
241    const size_t sizeNeeded = (8 + numInts) * sizeof(int);
242    if (size < sizeNeeded) return NO_MEMORY;
243
244    size_t fdCountNeeded = 0;
245    if (count < fdCountNeeded) return NO_MEMORY;
246
247    if (handle) {
248        // free previous handle if any
249        free_handle();
250    }
251
252    if (numFds || numInts) {
253        width  = buf[1];
254        height = buf[2];
255        stride = buf[3];
256        format = buf[4];
257        usage  = buf[5];
258        native_handle* h = native_handle_create(numFds, numInts);
259        memcpy(h->data,          fds,     numFds*sizeof(int));
260        memcpy(h->data + numFds, &buf[8], numInts*sizeof(int));
261        handle = h;
262    } else {
263        width = height = stride = format = usage = 0;
264        handle = NULL;
265    }
266
267    mOwner = ownHandle;
268    return NO_ERROR;
269}
270
271
272void GraphicBuffer::setIndex(int index) {
273    mIndex = index;
274}
275
276int GraphicBuffer::getIndex() const {
277    return mIndex;
278}
279
280// ---------------------------------------------------------------------------
281
282}; // namespace android
283