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      1 /*
      2 * Copyright (c) 2016, The Linux Foundation. All rights reserved.
      3 *
      4 * Redistribution and use in source and binary forms, with or without modification, are permitted
      5 * provided that the following conditions are met:
      6 *    * Redistributions of source code must retain the above copyright notice, this list of
      7 *      conditions and the following disclaimer.
      8 *    * Redistributions in binary form must reproduce the above copyright notice, this list of
      9 *      conditions and the following disclaimer in the documentation and/or other materials provided
     10 *      with the distribution.
     11 *    * Neither the name of The Linux Foundation nor the names of its contributors may be used to
     12 *      endorse or promote products derived from this software without specific prior written
     13 *      permission.
     14 *
     15 * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     16 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
     17 * NON-INFRINGEMENT ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
     18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
     19 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
     20 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
     21 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     22 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     23 */
     24 
     25 #include <hardware/hwcomposer_defs.h>
     26 #include <utils/constants.h>
     27 #include <utils/debug.h>
     28 #include "hwc_display_null.h"
     29 
     30 #define __CLASS__ "HWCDisplayNull"
     31 
     32 namespace sdm {
     33 
     34 int HWCDisplayNull::Create(CoreInterface *core_intf, hwc_procs_t const **hwc_procs,
     35                            HWCDisplay **hwc_display) {
     36   int status;
     37 
     38   DLOGI("Null display is being created");
     39   HWCDisplayNull *hwc_display_null = new HWCDisplayNull(core_intf, hwc_procs);
     40 
     41   status = hwc_display_null->Init();
     42   if (status) {
     43     delete hwc_display_null;
     44     return status;
     45   }
     46 
     47   *hwc_display = hwc_display_null;
     48 
     49   return 0;
     50 }
     51 
     52 void HWCDisplayNull::Destroy(HWCDisplay *hwc_display) {
     53   DLOGI("Null display is being destroyed");
     54   hwc_display->Deinit();
     55   delete hwc_display;
     56 }
     57 
     58 // We pass the display type as HWC_DISPLAY_PRIMARY to HWCDisplay, but since we override
     59 // and don't chain to HWCDisplay::Init(), that type does not actually get used.
     60 HWCDisplayNull::HWCDisplayNull(CoreInterface *core_intf, hwc_procs_t const **hwc_procs)
     61   : HWCDisplay(core_intf, hwc_procs, kPrimary, HWC_DISPLAY_PRIMARY, false, NULL,
     62                DISPLAY_CLASS_NULL) {
     63 }
     64 
     65 int HWCDisplayNull::Init() {
     66   // Don't call HWCDisplay::Init() for null display, we don't want the chain of
     67   // DisplayPrimary / HWPrimary etc objects to be created.
     68   return 0;
     69 }
     70 
     71 int HWCDisplayNull::Deinit() {
     72   return 0;
     73 }
     74 
     75 int HWCDisplayNull::Prepare(hwc_display_contents_1_t *content_list) {
     76   for (size_t i = 0; i < content_list->numHwLayers; i++) {
     77     if (content_list->hwLayers[i].compositionType == HWC_FRAMEBUFFER_TARGET ||
     78         content_list->hwLayers[i].compositionType == HWC_BACKGROUND) {
     79       continue;
     80     }
     81 
     82     content_list->hwLayers[i].compositionType = HWC_OVERLAY;
     83   }
     84 
     85   return 0;
     86 }
     87 
     88 int HWCDisplayNull::Commit(hwc_display_contents_1_t *content_list) {
     89   // HWCSession::Commit (from where this is called) already closes all the acquire
     90   // fences once we return from here. So no need to close acquire fences here.
     91   for (size_t i = 0; i < content_list->numHwLayers; i++) {
     92     content_list->hwLayers[i].releaseFenceFd = -1;
     93   }
     94 
     95   return 0;
     96 }
     97 
     98 #define NULL_DISPLAY_FPS 60
     99 
    100 int HWCDisplayNull::GetDisplayAttributes(uint32_t config, const uint32_t *display_attributes,
    101                                          int32_t *values) {
    102   for (int i = 0; display_attributes[i] != HWC_DISPLAY_NO_ATTRIBUTE; i++) {
    103     // We fake display resolution as 1080P by default, though it can be overriden through a call to
    104     // SetResolution(), and DPI as 160, though what the DPI value does is not clear
    105     switch (display_attributes[i]) {
    106     case HWC_DISPLAY_VSYNC_PERIOD:
    107       values[i] = INT32(1000000000L / NULL_DISPLAY_FPS);
    108       break;
    109     case HWC_DISPLAY_WIDTH:
    110       values[i] = static_cast<int32_t>(x_res_);
    111       break;
    112     case HWC_DISPLAY_HEIGHT:
    113       values[i] = static_cast<int32_t>(y_res_);
    114       break;
    115     }
    116   }
    117   return 0;
    118 }
    119 
    120 }  // namespace sdm
    121