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      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 ANDROID_UI_PRIVATE_SW_GRALLOC_HANDLE_H
     18 #define ANDROID_UI_PRIVATE_SW_GRALLOC_HANDLE_H
     19 
     20 #include <stdint.h>
     21 #include <limits.h>
     22 #include <sys/cdefs.h>
     23 #include <hardware/gralloc.h>
     24 #include <errno.h>
     25 
     26 #include <cutils/native_handle.h>
     27 
     28 namespace android {
     29 
     30 /*****************************************************************************/
     31 
     32 struct sw_gralloc_handle_t : public native_handle
     33 {
     34     // file-descriptors
     35     int     fd;
     36     // ints
     37     int     magic;
     38     int     size;
     39     int     base;
     40     int     prot;
     41     int     pid;
     42 
     43     static const int sNumInts = 5;
     44     static const int sNumFds = 1;
     45     static const int sMagic = '_sgh';
     46 
     47     sw_gralloc_handle_t() :
     48         fd(-1), magic(sMagic), size(0), base(0), prot(0), pid(getpid())
     49     {
     50         version = sizeof(native_handle);
     51         numInts = sNumInts;
     52         numFds = sNumFds;
     53     }
     54     ~sw_gralloc_handle_t() {
     55         magic = 0;
     56     }
     57 
     58     static int validate(const native_handle* h) {
     59         const sw_gralloc_handle_t* hnd = (const sw_gralloc_handle_t*)h;
     60         if (!h || h->version != sizeof(native_handle) ||
     61                 h->numInts != sNumInts || h->numFds != sNumFds ||
     62                 hnd->magic != sMagic)
     63         {
     64             return -EINVAL;
     65         }
     66         return 0;
     67     }
     68 
     69     static status_t alloc(uint32_t w, uint32_t h, int format,
     70             int usage, buffer_handle_t* handle, int32_t* stride);
     71     static status_t free(sw_gralloc_handle_t* hnd);
     72     static status_t registerBuffer(sw_gralloc_handle_t* hnd);
     73     static status_t unregisterBuffer(sw_gralloc_handle_t* hnd);
     74     static status_t lock(sw_gralloc_handle_t* hnd, int usage,
     75             int l, int t, int w, int h, void** vaddr);
     76     static status_t unlock(sw_gralloc_handle_t* hnd);
     77 };
     78 
     79 /*****************************************************************************/
     80 
     81 }; // namespace android
     82 
     83 #endif /* ANDROID_UI_PRIVATE_SW_GRALLOC_HANDLE_H */
     84