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      1 /*
      2  * Copyright (C) 2015 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_DRM_FRAMEBUFFER_
     18 #define ANDROID_DRM_FRAMEBUFFER_
     19 
     20 #include <stdint.h>
     21 
     22 #include <sync/sync.h>
     23 
     24 #include <ui/GraphicBuffer.h>
     25 
     26 namespace android {
     27 
     28 struct DrmFramebuffer {
     29   DrmFramebuffer() : release_fence_fd_(-1) {
     30   }
     31 
     32   ~DrmFramebuffer() {
     33     if (release_fence_fd() >= 0)
     34       close(release_fence_fd());
     35   }
     36 
     37   bool is_valid() {
     38     return buffer_ != NULL;
     39   }
     40 
     41   sp<GraphicBuffer> buffer() {
     42     return buffer_;
     43   }
     44 
     45   int release_fence_fd() {
     46     return release_fence_fd_;
     47   }
     48 
     49   void set_release_fence_fd(int fd) {
     50     if (release_fence_fd_ >= 0)
     51       close(release_fence_fd_);
     52     release_fence_fd_ = fd;
     53   }
     54 
     55   bool Allocate(uint32_t w, uint32_t h) {
     56     if (is_valid()) {
     57       if (buffer_->getWidth() == w && buffer_->getHeight() == h)
     58         return true;
     59 
     60       if (release_fence_fd_ >= 0) {
     61         if (sync_wait(release_fence_fd_, kReleaseWaitTimeoutMs) != 0) {
     62           ALOGE("Wait for release fence failed\n");
     63           return false;
     64         }
     65       }
     66       Clear();
     67     }
     68     buffer_ = new GraphicBuffer(w, h, PIXEL_FORMAT_RGBA_8888,
     69                                 GRALLOC_USAGE_HW_FB | GRALLOC_USAGE_HW_RENDER |
     70                                     GRALLOC_USAGE_HW_COMPOSER);
     71     release_fence_fd_ = -1;
     72     return is_valid();
     73   }
     74 
     75   void Clear() {
     76     if (!is_valid())
     77       return;
     78 
     79     if (release_fence_fd_ >= 0) {
     80       close(release_fence_fd_);
     81       release_fence_fd_ = -1;
     82     }
     83 
     84     buffer_.clear();
     85   }
     86 
     87   int WaitReleased(int timeout_milliseconds) {
     88     if (!is_valid())
     89       return 0;
     90     if (release_fence_fd_ < 0)
     91       return 0;
     92 
     93     int ret = sync_wait(release_fence_fd_, timeout_milliseconds);
     94     return ret;
     95   }
     96 
     97   // Somewhat arbitrarily chosen, but wanted to stay below 3000ms, which is the
     98   // system timeout
     99   static const int kReleaseWaitTimeoutMs = 1500;
    100 
    101  private:
    102   sp<GraphicBuffer> buffer_;
    103   int release_fence_fd_;
    104 };
    105 }
    106 
    107 #endif  // ANDROID_DRM_FRAMEBUFFER_
    108