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https://github.com/RGBCube/serenity
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935f401714
This screen backend is just memory-backed and doesn't connect to any screen hardware. That way, we can boot Serenity without video hardware but in full graphical mode :^) To create a virtual screen, put something like this in your WindowServer.ini. There's no way yet to do this through Display Settings, though an existing virtual screen's settings can be changed there. ```ini [Screen0] Mode=Virtual Left=1024 Top=0 Width=1920 Height=1080 ScaleFactor=1 ```
81 lines
2.2 KiB
C++
81 lines
2.2 KiB
C++
/*
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* Copyright (c) 2018-2020, the SerenityOS developers.
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* Copyright (c) 2022, kleines Filmröllchen <filmroellchen@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include "VirtualScreenBackend.h"
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#include "ScreenBackend.h"
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#include <AK/Try.h>
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#include <AK/kmalloc.h>
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#include <LibGfx/Color.h>
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namespace WindowServer {
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VirtualScreenBackend::~VirtualScreenBackend()
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{
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MUST(unmap_framebuffer());
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}
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ErrorOr<void> VirtualScreenBackend::open()
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{
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m_can_device_flush_buffers = true;
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m_can_set_head_buffer = true;
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return {};
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}
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void VirtualScreenBackend::set_head_buffer(int index)
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{
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VERIFY(index <= 1 && index >= 0);
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m_first_buffer_active = index == 0;
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}
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ErrorOr<void> VirtualScreenBackend::set_head_resolution(FBHeadResolution resolution)
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{
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if (resolution.head_index != 0)
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return Error::from_string_literal("Only head index 0 is supported."sv);
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m_height = resolution.height;
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if (resolution.pitch == 0)
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resolution.pitch = static_cast<int>(resolution.width * sizeof(Gfx::ARGB32));
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m_pitch = resolution.pitch;
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if (static_cast<int>(resolution.width * sizeof(Gfx::ARGB32)) != resolution.pitch)
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return Error::from_string_literal("Unsupported pitch"sv);
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m_width = resolution.width;
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return {};
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}
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ErrorOr<FBHeadProperties> VirtualScreenBackend::get_head_properties()
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{
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return FBHeadProperties {
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.head_index = 0,
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.pitch = static_cast<unsigned>(m_pitch),
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.width = static_cast<unsigned>(m_width),
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.height = static_cast<unsigned>(m_height),
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.offset = static_cast<unsigned>(m_first_buffer_active ? 0 : m_back_buffer_offset),
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.buffer_length = static_cast<unsigned>(m_size_in_bytes),
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};
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}
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ErrorOr<void> VirtualScreenBackend::map_framebuffer()
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{
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m_size_in_bytes = static_cast<unsigned long>(m_pitch) * m_height * 2;
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m_framebuffer = new Gfx::ARGB32[static_cast<unsigned long>(m_width) * m_height * 2];
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if (m_framebuffer == nullptr)
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return Error::from_errno(ENOMEM);
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m_back_buffer_offset = m_size_in_bytes / 2;
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m_first_buffer_active = true;
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return {};
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}
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ErrorOr<void> VirtualScreenBackend::unmap_framebuffer()
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{
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delete[] m_framebuffer;
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return {};
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}
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}
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