Mirrored_Repos/LookingGlass
1
0
Fork 0
mirror of https://github.com/gnif/LookingGlass.git synced 2024-11-22 13:37:22 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

[host] use a local copy of the header and then update it all in one go

Browse Source 
Writing to shared memory is much faster then reading as the shared
memory is not cached, this change ensures we are using a local copy
of the header performing the final update all in one go.
This commit is contained in:
Geoffrey McRae 2017-12-16 10:04:56 +11:00
parent b89a8fee04
commit 758b7af754
2 changed files with 41 additions and 32 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

70
host/Service.cpp
View File

@ -40,7 +40,7 @@ Service::Service() :
m_memory(NULL),
m_timer(NULL),
m_capture(NULL),
m_header(NULL),
m_shmHeader(NULL),
m_frameIndex(0),
m_cursorDataSize(0),
m_cursorData(NULL),
@ -92,15 +92,15 @@ bool Service::Initialize(ICapture * captureDevice)
}
// update everything except for the hostID
memcpy(m_header->magic, KVMFR_HEADER_MAGIC, sizeof(KVMFR_HEADER_MAGIC));
m_header->version = KVMFR_HEADER_VERSION;
m_header->guestID = m_ivshmem->GetPeerID();
m_header->updateCount = 0;
memcpy(m_shmHeader->magic, KVMFR_HEADER_MAGIC, sizeof(KVMFR_HEADER_MAGIC));
m_shmHeader->version = KVMFR_HEADER_VERSION;
m_shmHeader->guestID = m_ivshmem->GetPeerID();
m_shmHeader->updateCount = 0;
// clear but retain the restart flag if it was set by the client
INTERLOCKED_AND8((char *)&m_header->flags, KVMFR_HEADER_FLAG_RESTART);
ZeroMemory(&m_header->frame , sizeof(KVMFRFrame ));
ZeroMemory(&m_header->cursor, sizeof(KVMFRCursor));
INTERLOCKED_AND8((char *)&m_shmHeader->flags, KVMFR_HEADER_FLAG_RESTART);
ZeroMemory(&m_shmHeader->frame , sizeof(KVMFRFrame ));
ZeroMemory(&m_shmHeader->cursor, sizeof(KVMFRCursor));
m_initialized = true;
return true;
@ -108,7 +108,7 @@ bool Service::Initialize(ICapture * captureDevice)
bool Service::InitPointers()
{
m_header = reinterpret_cast<KVMFRHeader *>(m_memory);
m_shmHeader = reinterpret_cast<KVMFRHeader *>(m_memory);
m_frame[0] = (uint8_t *)(((uintptr_t)m_memory + sizeof(KVMFRHeader *) + 0x7F) & ~0x7F);
m_frameSize = ((m_ivshmem->GetSize() - (m_frame[0] - m_memory)) & ~0x7F) >> 1;
m_frame[1] = m_frame[0] + m_frameSize;
@ -142,7 +142,7 @@ void Service::DeInitialize()
m_cursorData = NULL;
}
m_header = NULL;
m_shmHeader = NULL;
m_frame[0] = NULL;
m_frame[1] = NULL;
m_dataOffset[0] = 0;
@ -171,7 +171,7 @@ bool Service::Process()
frame.buffer = m_frame[m_frameIndex];
frame.bufferSize = m_frameSize;
volatile uint8_t *flags = &m_header->flags;
volatile uint8_t *flags = &m_shmHeader->flags;
// wait for the host to notify that is it is ready to proceed
while (true)
@ -181,7 +181,7 @@ bool Service::Process()
// check if the client has flagged a restart
if (f & KVMFR_HEADER_FLAG_RESTART)
{
m_header->updateCount = 0;
m_shmHeader->updateCount = 0;
INTERLOCKED_AND8((volatile char *)flags, ~(KVMFR_HEADER_FLAG_RESTART));
restart = true;
break;
@ -252,17 +252,17 @@ bool Service::Process()
}
uint8_t updateFlags = 0;
m_header->cursor.flags = 0;
m_header.cursor.flags = 0;
if (!cursorOnly)
{
// signal a frame update
updateFlags |= KVMFR_HEADER_FLAG_FRAME;
m_header->frame.type = m_capture->GetFrameType();
m_header->frame.width = frame.width;
m_header->frame.height = frame.height;
m_header->frame.stride = frame.stride;
m_header->frame.dataPos = m_dataOffset[m_frameIndex];
m_header.frame.type = m_capture->GetFrameType();
m_header.frame.width = frame.width;
m_header.frame.height = frame.height;
m_header.frame.stride = frame.stride;
m_header.frame.dataPos = m_dataOffset[m_frameIndex];
if (++m_frameIndex == 2)
m_frameIndex = 0;
}
@ -280,11 +280,11 @@ bool Service::Process()
// tell the host where the cursor is
updateFlags |= KVMFR_HEADER_FLAG_CURSOR;
m_header->cursor.flags |= KVMFR_CURSOR_FLAG_POS;
m_header.cursor.flags |= KVMFR_CURSOR_FLAG_POS;
if (m_cursor.visible)
m_header->cursor.flags |= KVMFR_CURSOR_FLAG_VISIBLE;
m_header->cursor.x = m_cursor.x;
m_header->cursor.y = m_cursor.y;
m_header.cursor.flags |= KVMFR_CURSOR_FLAG_VISIBLE;
m_header.cursor.x = m_cursor.x;
m_header.cursor.y = m_cursor.y;
}
if (frame.cursor.hasShape || m_shapePending || (m_cursor.hasShape && restart))
@ -323,15 +323,15 @@ bool Service::Process()
{
// give the host the new cursor shape
updateFlags |= KVMFR_HEADER_FLAG_CURSOR;
m_header->cursor.flags |= KVMFR_CURSOR_FLAG_SHAPE;
m_header.cursor.flags |= KVMFR_CURSOR_FLAG_SHAPE;
if (m_cursor.visible)
m_header->cursor.flags |= KVMFR_CURSOR_FLAG_VISIBLE;
m_header.cursor.flags |= KVMFR_CURSOR_FLAG_VISIBLE;
m_header->cursor.type = m_cursor.type;
m_header->cursor.w = m_cursor.w;
m_header->cursor.h = m_cursor.h;
m_header->cursor.pitch = m_cursor.pitch;
m_header->cursor.dataPos = m_dataOffset[m_frameIndex];
m_header.cursor.type = m_cursor.type;
m_header.cursor.w = m_cursor.w;
m_header.cursor.h = m_cursor.h;
m_header.cursor.pitch = m_cursor.pitch;
m_header.cursor.dataPos = m_dataOffset[m_frameIndex];
memcpy(m_frame[m_frameIndex], m_cursorData, m_cursor.dataSize);
m_shapePending = false;
@ -344,8 +344,16 @@ bool Service::Process()
INTERLOCKED_AND8((volatile char *)flags, KVMFR_HEADER_FLAG_RESTART);
INTERLOCKED_OR8 ((volatile char *)flags, updateFlags);
// increment the update count to resume the host
++m_header->updateCount;
// update the shared header but don't touch the setup fields
const size_t offset = (uintptr_t)&m_header.frame - (uintptr_t)&m_header;
memcpy(
(uint8_t *)m_shmHeader + offset,
(uint8_t *)&m_header + offset,
sizeof(KVMFRHeader) - offset
);
// increment the update count so the guest stops waiting
++m_shmHeader->updateCount;
return true;
}

3
host/Service.h
View File

@ -54,7 +54,8 @@ private:
HANDLE m_timer;
ICapture * m_capture;
KVMFRHeader * m_header;
KVMFRHeader m_header;
KVMFRHeader * m_shmHeader;
uint8_t * m_frame[2];
size_t m_frameSize;
uint64_t m_dataOffset[2];