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WindowServer: Alpha blend background image in fullscreen mode

This commit is contained in:
Bananymous 2024-11-17 03:13:48 +02:00
parent 5e8fdc997a
commit df613775b6
1 changed files with 36 additions and 19 deletions
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43
userspace/programs/WindowServer/WindowServer.cpp
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@ -20,7 +20,10 @@ WindowServer::WindowServer(Framebuffer& framebuffer, int32_t corner_radius)
, m_cursor({ framebuffer.width / 2, framebuffer.height / 2 })
, m_font(MUST(LibFont::Font::load("/usr/share/fonts/lat0-16.psfu"_sv)))
{
MUST(m_pages_to_sync_bitmap.resize(BAN::Math::div_round_up<size_t>(m_framebuffer.width * m_framebuffer.height * sizeof(uint32_t), 4096 * 8), 0));
BAN::Vector<LibImage::Image::Color> bitmap;
MUST(bitmap.resize(m_framebuffer.width * m_framebuffer.height, { 0x10, 0x10, 0x10, 0xFF }));
m_background_image = MUST(BAN::UniqPtr<LibImage::Image>::create(m_framebuffer.width, m_framebuffer.height, BAN::move(bitmap)));
invalidate(m_framebuffer.area());
}
@ -574,6 +577,9 @@ static uint32_t alpha_blend(uint32_t color_a, uint32_t color_b)
void WindowServer::invalidate(Rectangle area)
{
ASSERT(m_background_image->width() == (uint64_t)m_framebuffer.width);
ASSERT(m_background_image->height() == (uint64_t)m_framebuffer.height);
const auto get_cursor_pixel =
[](int32_t rel_x, int32_t rel_y) -> BAN::Optional<uint32_t>
{
@ -605,11 +611,28 @@ void WindowServer::invalidate(Rectangle area)
return;
area = focused_overlap.release_value();
const bool should_alpha_blend = m_focused_window->get_attributes().alpha_channel;
if (client_area == m_framebuffer.area())
{
if (!should_alpha_blend)
{
for (int32_t y = area.y; y < area.y + area.height; y++)
for (int32_t x = area.x; x < area.x + area.width; x++)
m_framebuffer.mmap[y * m_framebuffer.width + x] = m_focused_window->framebuffer()[y * m_focused_window->client_width() + x];
}
else
{
for (int32_t y = area.y; y < area.y + area.height; y++)
{
for (int32_t x = area.x; x < area.x + area.width; x++)
{
const uint32_t src_pixel = m_focused_window->framebuffer()[y * m_focused_window->client_width() + x];
const uint32_t bg_pixel = m_background_image->get_color(x, y).as_argb();
m_framebuffer.mmap[y * m_framebuffer.width + x] = alpha_blend(src_pixel, bg_pixel);
}
}
}
mark_pending_sync(area);
}
else
@ -630,7 +653,12 @@ void WindowServer::invalidate(Rectangle area)
{
const int32_t src_x = BAN::Math::clamp<int32_t>(dst_x * m_focused_window->client_width() / m_framebuffer.width, 0, m_focused_window->client_width());
const int32_t src_y = BAN::Math::clamp<int32_t>(dst_y * m_focused_window->client_height() / m_framebuffer.height, 0, m_focused_window->client_height());
m_framebuffer.mmap[dst_y * m_framebuffer.width + dst_x] = m_focused_window->framebuffer()[src_y * m_focused_window->client_width() + src_x];
const uint32_t src_pixel = m_focused_window->framebuffer()[src_y * m_focused_window->client_width() + src_x];
const uint32_t bg_pixel = m_background_image->get_color(dst_x, dst_y).as_argb();
uint32_t& dst_pixel = m_framebuffer.mmap[dst_y * m_framebuffer.width + dst_x];
dst_pixel = should_alpha_blend ? alpha_blend(src_pixel, bg_pixel) : src_pixel;
}
}
@ -682,20 +710,9 @@ void WindowServer::invalidate(Rectangle area)
return;
area = fb_overlap.release_value();
if (m_background_image)
{
ASSERT(m_background_image->width() == (uint64_t)m_framebuffer.width);
ASSERT(m_background_image->height() == (uint64_t)m_framebuffer.height);
for (int32_t y = area.y; y < area.y + area.height; y++)
for (int32_t x = area.x; x < area.x + area.width; x++)
m_framebuffer.mmap[y * m_framebuffer.width + x] = m_background_image->get_color(x, y).as_argb();
}
else
{
for (int32_t y = area.y; y < area.y + area.height; y++)
for (int32_t x = area.x; x < area.x + area.width; x++)
m_framebuffer.mmap[y * m_framebuffer.width + x] = 0xFF101010;
}
// FIXME: this loop should be inverse order and terminate
// after window without alpha channel is found