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WindowServer: Support windows with alpha channels. And per-WSWindow opacity.

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This patch also adds a Format concept to GraphicsBitmap. For now there are
only two formats: RGB32 and RGBA32. Windows with alpha channel have their
backing stores created in the RGBA32 format.

Use this to make Terminal windows semi-transparent for that comfy rice look.
There is one problem here, in that window compositing overdraw incurs
multiple passes of blending of the same pixels. This leads to a mismatch in
opacity which is obviously not good. I will work on this in a later patch.

The alpha blending is currently straight C++. It should be relatively easy
to optimize this using SSE instructions.

For now I'm just happy with the cute effect. :^)
This commit is contained in:
Andreas Kling 2019-02-19 01:42:53 +01:00
parent d4973842c9
commit 9b71307d49
25 changed files with 244 additions and 71 deletions
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16
Applications/Terminal/Terminal.cpp
View file

@ -143,7 +143,7 @@ unsigned parse_uint(const String& str, bool& ok)
static inline Color lookup_color(unsigned color)
{
return xterm_colors[color];
return Color::from_rgb(xterm_colors[color]);
}
void Terminal::escape$m(const Vector<unsigned>& params)
@ -668,10 +668,14 @@ void Terminal::keydown_event(GKeyEvent& event)
}
void Terminal::paint_event(GPaintEvent&)
{
Rect rect { 0, 0, m_pixel_width, m_pixel_height };
{
Painter painter(*this);
if (m_needs_background_fill) {
m_needs_background_fill = false;
painter.fill_rect(rect(), Color(Color::Black).with_alpha(255 * m_opacity));
}
if (m_rows_to_scroll_backing_store && m_rows_to_scroll_backing_store < m_rows) {
int first_scanline = m_inset;
int second_scanline = m_inset + (m_rows_to_scroll_backing_store * m_line_height);
@ -695,7 +699,7 @@ void Terminal::paint_event(GPaintEvent&)
line.dirty = false;
bool has_only_one_background_color = line.has_only_one_background_color();
if (has_only_one_background_color) {
painter.fill_rect(row_rect(row), lookup_color(line.attributes[0].background_color));
painter.fill_rect(row_rect(row), lookup_color(line.attributes[0].background_color).with_alpha(255 * m_opacity));
}
for (word column = 0; column < m_columns; ++column) {
bool should_reverse_fill_for_cursor = m_in_active_window && row == m_cursor_row && column == m_cursor_column;
@ -704,7 +708,7 @@ void Terminal::paint_event(GPaintEvent&)
auto character_rect = glyph_rect(row, column);
if (!has_only_one_background_color || should_reverse_fill_for_cursor) {
auto cell_rect = character_rect.inflated(0, m_line_spacing);
painter.fill_rect(cell_rect, lookup_color(should_reverse_fill_for_cursor ? attribute.foreground_color : attribute.background_color));
painter.fill_rect(cell_rect, lookup_color(should_reverse_fill_for_cursor ? attribute.foreground_color : attribute.background_color).with_alpha(255 * m_opacity));
}
if (ch == ' ')
continue;
@ -718,7 +722,7 @@ void Terminal::paint_event(GPaintEvent&)
}
if (m_belling)
painter.draw_rect(rect, Color::Red);
painter.draw_rect(rect(), Color::Red);
}
void Terminal::set_window_title(String&& title)