1 /*
2  * Copyright (C) 2008 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_PRIV_H_
18 #define GRALLOC_PRIV_H_
19 
20 #include <stdint.h>
21 #include <limits.h>
22 #include <sys/cdefs.h>
23 #include <hardware/gralloc.h>
24 #include <pthread.h>
25 #include <errno.h>
26 #include <unistd.h>
27 
28 #include <cutils/native_handle.h>
29 
30 #include <linux/fb.h>
31 
32 /*****************************************************************************/
33 
34 struct private_module_t;
35 struct private_handle_t;
36 
37 struct private_module_t {
38     gralloc_module_t base;
39 
40     private_handle_t* framebuffer;
41     uint32_t flags;
42     uint32_t numBuffers;
43     uint32_t bufferMask;
44     pthread_mutex_t lock;
45     buffer_handle_t currentBuffer;
46     int pmem_master;
47     void* pmem_master_base;
48 
49     struct fb_var_screeninfo info;
50     struct fb_fix_screeninfo finfo;
51     float xdpi;
52     float ydpi;
53     float fps;
54 };
55 
56 /*****************************************************************************/
57 
58 #ifdef __cplusplus
59 struct private_handle_t : public native_handle {
60 #else
61 struct private_handle_t {
62     struct native_handle nativeHandle;
63 #endif
64 
65     enum {
66         PRIV_FLAGS_FRAMEBUFFER = 0x00000001
67     };
68 
69     // file-descriptors
70     int     fd;
71     // ints
72     int     magic;
73     int     flags;
74     int     size;
75     int     offset;
76 
77     // FIXME: the attributes below should be out-of-line
78     uint64_t base __attribute__((aligned(8)));
79     int     pid;
80 
81 #ifdef __cplusplus
sNumIntsprivate_handle_t82     static inline int sNumInts() {
83         return (((sizeof(private_handle_t) - sizeof(native_handle_t))/sizeof(int)) - sNumFds);
84     }
85     static const int sNumFds = 1;
86     static const int sMagic = 0x3141592;
87 
private_handle_tprivate_handle_t88     private_handle_t(int fd, int size, int flags) :
89         fd(fd), magic(sMagic), flags(flags), size(size), offset(0),
90         base(0), pid(getpid())
91     {
92         version = sizeof(native_handle);
93         numInts = sNumInts();
94         numFds = sNumFds;
95     }
~private_handle_tprivate_handle_t96     ~private_handle_t() {
97         magic = 0;
98     }
99 
validateprivate_handle_t100     static int validate(const native_handle* h) {
101         const private_handle_t* hnd = (const private_handle_t*)h;
102         if (!h || h->version != sizeof(native_handle) ||
103                 h->numInts != sNumInts() || h->numFds != sNumFds ||
104                 hnd->magic != sMagic)
105         {
106             ALOGE("invalid gralloc handle (at %p)", h);
107             return -EINVAL;
108         }
109         return 0;
110     }
111 #endif
112 };
113 
114 #endif /* GRALLOC_PRIV_H_ */
115