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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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8
Applications/FileManager/DirectoryView.cpp
View file

@ -12,9 +12,9 @@
DirectoryView::DirectoryView(GWidget* parent)
: GWidget(parent)
{
m_directory_icon = GraphicsBitmap::load_from_file("/res/icons/folder16.rgb", { 16, 16 });
m_file_icon = GraphicsBitmap::load_from_file("/res/icons/file16.rgb", { 16, 16 });
m_symlink_icon = GraphicsBitmap::load_from_file("/res/icons/link16.rgb", { 16, 16 });
m_directory_icon = GraphicsBitmap::load_from_file(GraphicsBitmap::Format::RGBA32, "/res/icons/folder16.rgb", { 16, 16 });
m_file_icon = GraphicsBitmap::load_from_file(GraphicsBitmap::Format::RGBA32, "/res/icons/file16.rgb", { 16, 16 });
m_symlink_icon = GraphicsBitmap::load_from_file(GraphicsBitmap::Format::RGBA32, "/res/icons/link16.rgb", { 16, 16 });
m_scrollbar = new GScrollBar(Orientation::Vertical, this);
m_scrollbar->set_step(4);
@ -142,7 +142,7 @@ void DirectoryView::paint_event(GPaintEvent&)
Rect name_rect(icon_rect.right() + horizontal_padding, y, 100, item_height());
Rect size_rect(name_rect.right() + horizontal_padding, y, 64, item_height());
painter.fill_rect(row_rect(painted_item_index), i % 2 ? Color(210, 210, 210) : Color::White);
painter.blit_with_alpha(icon_rect.location(), icon_for(entry), { 0, 0, icon_size, icon_size });
painter.blit(icon_rect.location(), icon_for(entry), { 0, 0, icon_size, icon_size });
painter.draw_text(name_rect, entry.name, TextAlignment::CenterLeft, Color::Black);
if (should_show_size_for(entry))
painter.draw_text(size_rect, pretty_byte_size(entry.size), TextAlignment::CenterRight, Color::Black);