| #pragma once |
| /* |
| * Copyright (C) 2017 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include <errno.h> |
| #include <cutils/native_handle.h> |
| #include <hardware/gralloc.h> |
| #include <log/log.h> |
| |
| struct vsoc_alloc_device_t { |
| alloc_device_t device; |
| }; |
| |
| struct vsoc_gralloc_module_t { |
| gralloc_module_t base; |
| }; |
| |
| static_assert(sizeof(int) >= 4, "At least 4 bytes are needed for offsets"); |
| |
| struct vsoc_buffer_handle_t : public native_handle { |
| // File descriptors |
| int fd; |
| // ints |
| int magic; |
| int format; |
| int x_res; |
| int y_res; |
| int stride_in_pixels; |
| int size; |
| // buffer offset in bytes divided by PAGE_SIZE |
| int offset; |
| |
| static inline int sNumInts() { |
| return ((sizeof(vsoc_buffer_handle_t) - sizeof(native_handle_t)) / |
| sizeof(int) - |
| sNumFds); |
| } |
| static const int sNumFds = 1; |
| static const int sMagic = 0xc63752f4; |
| |
| vsoc_buffer_handle_t(int fd, |
| int offset, |
| int size, |
| int format, |
| int x_res, |
| int y_res, |
| int stride_in_pixels) |
| : fd(fd), |
| magic(sMagic), |
| format(format), |
| x_res(x_res), |
| y_res(y_res), |
| stride_in_pixels(stride_in_pixels), |
| size(size), |
| offset(offset) { |
| version = sizeof(native_handle); |
| numInts = sNumInts(); |
| numFds = sNumFds; |
| } |
| |
| ~vsoc_buffer_handle_t() { |
| magic = 0; |
| } |
| |
| static int validate(const native_handle* handle) { |
| const vsoc_buffer_handle_t* hnd = |
| reinterpret_cast<const vsoc_buffer_handle_t*>(handle); |
| if (!hnd || hnd->version != sizeof(native_handle) || |
| hnd->numInts != sNumInts() || hnd->numFds != sNumFds || |
| hnd->magic != sMagic) { |
| ALOGE("Invalid gralloc handle (at %p)", handle); |
| return -EINVAL; |
| } |
| return 0; |
| } |
| }; |
| |
| // These functions are to be used to map/unmap gralloc buffers. They are thread |
| // safe and ensure that the same buffer never gets mapped twice. |
| void* reference_buffer(const vsoc_buffer_handle_t* hnd); |
| int unreference_buffer(const vsoc_buffer_handle_t* hnd); |
| |
| // TODO(jemoreira): Move this to a place where it can be used by the gralloc |
| // region as well. |
| inline int align(int input, int alignment) { |
| return (input + alignment - 1) & -alignment; |
| } |