1 /* 2 * Copyright 2011 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 #ifndef __GRALLOC_CB_H__ 18 #define __GRALLOC_CB_H__ 19 20 #include <hardware/hardware.h> 21 #include <hardware/gralloc.h> 22 #include <cutils/native_handle.h> 23 24 #define BUFFER_HANDLE_MAGIC ((int)0xabfabfab) 25 #define CB_HANDLE_NUM_INTS(nfds) (int)((sizeof(cb_handle_t) - (nfds)*sizeof(int)) / sizeof(int)) 26 27 // 28 // Our buffer handle structure 29 // 30 struct cb_handle_t : public native_handle { 31 cb_handle_tcb_handle_t32 cb_handle_t(int p_fd, int p_ashmemSize, int p_usage, 33 int p_width, int p_height, 34 int p_glFormat, int p_glType) : 35 fd(p_fd), 36 magic(BUFFER_HANDLE_MAGIC), 37 usage(p_usage), 38 width(p_width), 39 height(p_height), 40 glFormat(p_glFormat), 41 glType(p_glType), 42 ashmemSize(p_ashmemSize), 43 ashmemBase(NULL), 44 ashmemBasePid(0), 45 mappedPid(0), 46 lockedLeft(0), 47 lockedTop(0), 48 lockedWidth(0), 49 lockedHeight(0), 50 hostHandle(0) 51 { 52 version = sizeof(native_handle); 53 numFds = 0; 54 numInts = CB_HANDLE_NUM_INTS(numFds); 55 } 56 ~cb_handle_tcb_handle_t57 ~cb_handle_t() { 58 magic = 0; 59 } 60 setFdcb_handle_t61 void setFd(int p_fd) { 62 if (p_fd >= 0) { 63 numFds = 1; 64 } 65 else { 66 numFds = 0; 67 } 68 fd = p_fd; 69 numInts = CB_HANDLE_NUM_INTS(numFds); 70 } 71 validatecb_handle_t72 static bool validate(cb_handle_t * hnd) { 73 return (hnd && 74 hnd->version == sizeof(native_handle) && 75 hnd->magic == BUFFER_HANDLE_MAGIC && 76 hnd->numInts == CB_HANDLE_NUM_INTS(hnd->numFds)); 77 } 78 canBePostedcb_handle_t79 bool canBePosted() { 80 return (0 != (usage & GRALLOC_USAGE_HW_FB)); 81 } 82 83 // file-descriptors 84 int fd; // ashmem fd (-1 of ashmem region did not allocated, i.e. no SW access needed) 85 86 // ints 87 int magic; // magic number in order to validate a pointer to be a cb_handle_t 88 int usage; // usage bits the buffer was created with 89 int width; // buffer width 90 int height; // buffer height 91 int glFormat; // OpenGL format enum used for host h/w color buffer 92 int glType; // OpenGL type enum used when uploading to host 93 int ashmemSize; // ashmem region size for the buffer (0 unless is HW_FB buffer or 94 // s/w access is needed) 95 int ashmemBase; // CPU address of the mapped ashmem region 96 int ashmemBasePid; // process id which mapped the ashmem region 97 int mappedPid; // process id which succeeded gralloc_register call 98 int lockedLeft; // region of buffer locked for s/w write 99 int lockedTop; 100 int lockedWidth; 101 int lockedHeight; 102 uint32_t hostHandle; 103 }; 104 105 106 #endif //__GRALLOC_CB_H__ 107