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core: Allow mapping shared memory graphics buffer

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Shared memory graphics buffers can be mapped, so implement
GraphicsBuffer::map() and GraphicsBuffer::unmap().
This commit is contained in:
Vlad Zahorodnii 2023-06-20 11:20:32 +03:00 committed by David Edmundson
parent d8029e461e
commit 80a3fea9f8
2 changed files with 32 additions and 1 deletions
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27
src/core/shmgraphicsbufferallocator.cpp
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@ -21,6 +21,33 @@ ShmGraphicsBuffer::ShmGraphicsBuffer(ShmAttributes &&attributes)
{
}
void *ShmGraphicsBuffer::map(MapFlags flags)
{
if (m_memoryMap.isValid()) {
return m_memoryMap.data();
}
int prot = 0;
if (flags & MapFlag::Read) {
prot |= PROT_READ;
}
if (flags & MapFlag::Write) {
prot |= PROT_WRITE;
}
m_memoryMap = MemoryMap(m_attributes.stride * m_attributes.size.height(), prot, MAP_SHARED, m_attributes.fd.get(), m_attributes.offset);
if (m_memoryMap.isValid()) {
return m_memoryMap.data();
}
return nullptr;
}
void ShmGraphicsBuffer::unmap()
{
m_memoryMap = MemoryMap{};
}
QSize ShmGraphicsBuffer::size() const
{
return m_attributes.size;

6
src/core/shmgraphicsbufferallocator.h
View file

@ -8,7 +8,7 @@
#include "core/graphicsbuffer.h"
#include "core/graphicsbufferallocator.h"
#include "utils/filedescriptor.h"
#include "utils/memorymap.h"
namespace KWin
{
@ -20,12 +20,16 @@ class KWIN_EXPORT ShmGraphicsBuffer : public GraphicsBuffer
public:
explicit ShmGraphicsBuffer(ShmAttributes &&attributes);
void *map(MapFlags flags) override;
void unmap() override;
QSize size() const override;
bool hasAlphaChannel() const override;
const ShmAttributes *shmAttributes() const override;
private:
ShmAttributes m_attributes;
MemoryMap m_memoryMap;
bool m_hasAlphaChannel;
};