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Kernel: Implement fast scrolling for TTY

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Bananymous
2024-06-28 23:15:03 +03:00
parent 010c2c934b
commit 42237a3bc8
6 changed files with 46 additions and 6 deletions
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19
kernel/kernel/Device/FramebufferDevice.cpp
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@@ -135,6 +135,25 @@ namespace Kernel
video_buffer_u8[(y * m_width + x) * (BANAN_FB_BPP / 8) + 3] = rgb >> 24;
}
void FramebufferDevice::scroll(int32_t rows, uint32_t rgb)
{
if (rows == 0)
return;
rows = BAN::Math::clamp<int32_t>(rows, -m_height, m_height);
const uint32_t abs_rows = BAN::Math::abs(rows);
auto* video_buffer_u8 = reinterpret_cast<uint8_t*>(m_video_buffer->vaddr());
uint8_t* src = (rows < 0) ? video_buffer_u8 : &video_buffer_u8[(abs_rows * m_width) * (BANAN_FB_BPP / 8)];
uint8_t* dst = (rows > 0) ? video_buffer_u8 : &video_buffer_u8[(abs_rows * m_width) * (BANAN_FB_BPP / 8)];
memmove(dst, src, (m_height - abs_rows) * m_width * (BANAN_FB_BPP / 8));
uint32_t start_y = (rows < 0) ? 0 : m_height - abs_rows;
uint32_t stop_y = (rows < 0) ? abs_rows : m_height;
for (uint32_t y = start_y; y < stop_y; y++)
for (uint32_t x = 0; x < m_width; x++)
set_pixel(x, y, rgb);
}
void FramebufferDevice::sync_pixels_full()
{
auto* video_memory_u8 = reinterpret_cast<uint8_t*>(m_video_memory_vaddr);