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Kernel: Add a simple shared memory API for two processes only.

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And use this to implement shared bitmaps between WindowServer and clients.
This commit is contained in:
Andreas Kling 2019-02-16 12:13:43 +01:00
parent 4db78dabd3
commit 4ea28bf0a5
13 changed files with 240 additions and 48 deletions
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59
SharedGraphics/GraphicsBitmap.cpp
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@ -15,31 +15,6 @@
#endif
#ifdef KERNEL
RetainPtr<GraphicsBitmap> GraphicsBitmap::create(Process& process, const Size& size)
{
return adopt(*new GraphicsBitmap(process, size));
}
GraphicsBitmap::GraphicsBitmap(Process& process, const Size& size)
: m_size(size)
, m_pitch(size.width() * sizeof(RGBA32))
, m_client_process(process.make_weak_ptr())
{
InterruptDisabler disabler;
size_t size_in_bytes = size.width() * size.height() * sizeof(RGBA32);
auto vmo = VMObject::create_anonymous(size_in_bytes);
m_client_region = process.allocate_region_with_vmo(LinearAddress(), size_in_bytes, vmo.copy_ref(), 0, "GraphicsBitmap (client)", true, true);
m_client_region->set_shared(true);
m_client_region->set_is_bitmap(true);
m_client_region->commit();
auto& server = WSMessageLoop::the().server_process();
m_server_region = server.allocate_region_with_vmo(LinearAddress(), size_in_bytes, move(vmo), 0, "GraphicsBitmap (server)", true, false);
m_server_region->set_shared(true);
m_server_region->set_is_bitmap(true);
m_data = (RGBA32*)m_server_region->laddr().as_ptr();
}
RetainPtr<GraphicsBitmap> GraphicsBitmap::create_kernel_only(const Size& size)
{
return adopt(*new GraphicsBitmap(size));
@ -115,11 +90,32 @@ GraphicsBitmap::GraphicsBitmap(const Size& size, RGBA32* data)
{
}
RetainPtr<GraphicsBitmap> GraphicsBitmap::create_with_shared_buffer(int shared_buffer_id, const Size& size, RGBA32* data)
{
if (!data) {
#ifdef KERNEL
void* shared_buffer = current->sys$get_shared_buffer(shared_buffer_id);
#else
void* shared_buffer = get_shared_buffer(shared_buffer_id);
#endif
if (!shared_buffer || shared_buffer == (void*)-1)
return nullptr;
data = (RGBA32*)shared_buffer;
}
return adopt(*new GraphicsBitmap(shared_buffer_id, size, data));
}
GraphicsBitmap::GraphicsBitmap(int shared_buffer_id, const Size& size, RGBA32* data)
: m_size(size)
, m_data(data)
, m_pitch(size.width() * sizeof(RGBA32))
, m_shared_buffer_id(shared_buffer_id)
{
}
GraphicsBitmap::~GraphicsBitmap()
{
#ifdef KERNEL
if (m_client_region && m_client_process)
m_client_process->deallocate_region(*m_client_region);
if (m_server_region)
WSMessageLoop::the().server_process().deallocate_region(*m_server_region);
#else
@ -128,6 +124,15 @@ GraphicsBitmap::~GraphicsBitmap()
ASSERT(rc == 0);
}
#endif
if (m_shared_buffer_id != -1) {
int rc;
#ifdef KERNEL
rc = current->sys$release_shared_buffer(m_shared_buffer_id);
#else
rc = release_shared_buffer(m_shared_buffer_id);
#endif
ASSERT(rc == 0);
}
m_data = nullptr;
}