commit 3f37b7b1d750190f15afd0d6c0a54e1ea76cbd40
author Prabir Pradhan <prabirmsp@google.com> Tue Nov 10 16:50:18 2020 -0800
committer Prabir Pradhan <prabirmsp@google.com> Tue Nov 17 14:55:52 2020 -0800
tree 6da90b8365b50b4502f2d544c538d1cd8c45358d
parent 7e186182c8181458ec9d0072bc1f3d7f34ba88a6

SyncPointerCapture (3/n): Add Capture event to InputChannel

This CL adds the ability to send a CAPTURE event through the
InputChannel, and adds the appropriate processing logic to
InputPublisher and InputConsumer.

This will be used by the InputDispatcher to notify windows when they
have either lost or gained Pointer Capture.

Bug: 141749603
Test: atest libinput_tests
Change-Id: I102833e6f0fd1e8e9c4b3c12e7a5a737eeda2377

libs/input/InputTransport.cpp

diff --git a/libs/input/InputTransport.cpp b/libs/input/InputTransport.cpp
index 85df405..acea473 100644
--- a/libs/input/InputTransport.cpp
+++ b/libs/input/InputTransport.cpp
@@ -105,6 +105,8 @@
                 return true;
             case Type::FOCUS:
                 return true;
+            case Type::CAPTURE:
+                return true;
         }
     }
     return false;
@@ -120,6 +122,8 @@
             return sizeof(Header) + body.finished.size();
         case Type::FOCUS:
             return sizeof(Header) + body.focus.size();
+        case Type::CAPTURE:
+            return sizeof(Header) + body.capture.size();
     }
     return sizeof(Header);
 }
@@ -238,6 +242,11 @@
             msg->body.focus.inTouchMode = body.focus.inTouchMode;
             break;
         }
+        case InputMessage::Type::CAPTURE: {
+            msg->body.capture.eventId = body.capture.eventId;
+            msg->body.capture.pointerCaptureEnabled = body.capture.pointerCaptureEnabled;
+            break;
+        }
     }
 }
 
@@ -571,6 +580,23 @@
     return mChannel->sendMessage(&msg);
 }
 
+status_t InputPublisher::publishCaptureEvent(uint32_t seq, int32_t eventId,
+                                             bool pointerCaptureEnabled) {
+    if (ATRACE_ENABLED()) {
+        std::string message =
+                StringPrintf("publishCaptureEvent(inputChannel=%s, pointerCaptureEnabled=%s)",
+                             mChannel->getName().c_str(), toString(pointerCaptureEnabled));
+        ATRACE_NAME(message.c_str());
+    }
+
+    InputMessage msg;
+    msg.header.type = InputMessage::Type::CAPTURE;
+    msg.header.seq = seq;
+    msg.body.capture.eventId = eventId;
+    msg.body.capture.pointerCaptureEnabled = pointerCaptureEnabled ? 1 : 0;
+    return mChannel->sendMessage(&msg);
+}
+
 status_t InputPublisher::receiveFinishedSignal(uint32_t* outSeq, bool* outHandled) {
     if (DEBUG_TRANSPORT_ACTIONS) {
         ALOGD("channel '%s' publisher ~ receiveFinishedSignal", mChannel->getName().c_str());
@@ -739,6 +765,16 @@
                 *outEvent = focusEvent;
                 break;
             }
+
+            case InputMessage::Type::CAPTURE: {
+                CaptureEvent* captureEvent = factory->createCaptureEvent();
+                if (!captureEvent) return NO_MEMORY;
+
+                initializeCaptureEvent(captureEvent, &mMsg);
+                *outSeq = mMsg.header.seq;
+                *outEvent = captureEvent;
+                break;
+            }
         }
     }
     return OK;
@@ -1171,6 +1207,10 @@
                       msg->body.focus.inTouchMode == 1);
 }
 
+void InputConsumer::initializeCaptureEvent(CaptureEvent* event, const InputMessage* msg) {
+    event->initialize(msg->body.capture.eventId, msg->body.capture.pointerCaptureEnabled == 1);
+}
+
 void InputConsumer::initializeMotionEvent(MotionEvent* event, const InputMessage* msg) {
     uint32_t pointerCount = msg->body.motion.pointerCount;
     PointerProperties pointerProperties[pointerCount];
@@ -1274,6 +1314,12 @@
                                                        toString(msg.body.focus.inTouchMode));
                     break;
                 }
+                case InputMessage::Type::CAPTURE: {
+                    out += android::base::StringPrintf("hasCapture=%s",
+                                                       toString(msg.body.capture
+                                                                        .pointerCaptureEnabled));
+                    break;
+                }
             }
             out += "\n";
         }