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Kernel: Make VirtIO GPU buffer flipping more spec compliant

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The spec requires a flush after setting the new buffer resource id,
which is required by QEMUs SDL backend but not the GTK backend. This
brings us in line with the spec and makes it work for the SDL backend.
This commit is contained in:
Tom 2021-07-10 10:42:04 -06:00 • committed by Andreas Kling
parent e718de454e
commit 02651f8dc6
2 changed files with 15 additions and 0 deletions
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14
Kernel/Graphics/VirtIOGPU/VirtIOFrameBufferDevice.cpp
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@ -128,6 +128,8 @@ void VirtIOFrameBufferDevice::set_buffer(int buffer_index)
return;
m_current_buffer = &buffer;
m_gpu.set_scanout_resource(m_scanout.value(), buffer.resource_id, display_info().rect);
m_gpu.flush_displayed_image(buffer.dirty_rect, buffer.resource_id); // QEMU SDL backend requires this (as per spec)
buffer.dirty_rect = {};
}
int VirtIOFrameBufferDevice::ioctl(FileDescription&, unsigned request, FlatPtr arg)
@ -196,6 +198,18 @@ int VirtIOFrameBufferDevice::ioctl(FileDescription&, unsigned request, FlatPtr a
if (&buffer == m_current_buffer) {
// Flushing directly to screen
flush_displayed_image(dirty_rect, buffer);
buffer.dirty_rect = {};
} else {
if (buffer.dirty_rect.width == 0 || buffer.dirty_rect.height == 0) {
buffer.dirty_rect = dirty_rect;
} else {
auto current_dirty_right = buffer.dirty_rect.x + buffer.dirty_rect.width;
auto current_dirty_bottom = buffer.dirty_rect.y + buffer.dirty_rect.height;
buffer.dirty_rect.x = min(buffer.dirty_rect.x, dirty_rect.x);
buffer.dirty_rect.y = min(buffer.dirty_rect.y, dirty_rect.y);
buffer.dirty_rect.width = max(current_dirty_right, dirty_rect.x + dirty_rect.width) - buffer.dirty_rect.x;
buffer.dirty_rect.height = max(current_dirty_bottom, dirty_rect.y + dirty_rect.height) - buffer.dirty_rect.y;
}
}
}
}