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LibGUI+LibGfx: Paint scollbar tracks with a dithered pattern

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Instead of a solid color, we now paint the track/gutter of scrollbars
using a 2-color dither pattern for a pleasant millennium feel. :^)
This commit is contained in:
Andreas Kling 2020-05-10 01:00:21 +02:00
parent ac701cb589
commit 9e74793ce2
3 changed files with 22 additions and 1 deletions
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2
Libraries/LibGUI/ScrollBar.cpp
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@ -220,7 +220,7 @@ void ScrollBar::paint_event(PaintEvent& event)
Painter painter(*this);
painter.add_clip_rect(event.rect());
painter.fill_rect(rect(), palette().button().lightened(1.1f));
painter.fill_rect_with_dither_pattern(rect(), palette().button().lightened(1.3f), palette().button());
bool decrement_pressed = m_automatic_scrolling_direction == AutomaticScrollingDirection::Decrement;
bool increment_pressed = m_automatic_scrolling_direction == AutomaticScrollingDirection::Increment;

20
Libraries/LibGfx/Painter.cpp
View file

@ -136,6 +136,26 @@ void Painter::fill_rect(const Rect& a_rect, Color color)
}
}
void Painter::fill_rect_with_dither_pattern(const Rect& a_rect, Color color_a, Color color_b)
{
auto rect = a_rect.translated(translation()).intersected(clip_rect());
if (rect.is_empty())
return;
RGBA32* dst = m_target->scanline(rect.top()) + rect.left();
const size_t dst_skip = m_target->pitch() / sizeof(RGBA32);
for (int i = 0; i < rect.height(); ++i) {
for (int j = 0; j < rect.width(); ++j) {
if (i & 1)
dst[j] = (j & 1) ? color_a.value() : color_b.value();
else
dst[j] = (j & 1) ? color_b.value() : color_a.value();
}
dst += dst_skip;
}
}
void Painter::fill_rect_with_checkerboard(const Rect& a_rect, const Size& cell_size, Color color_dark, Color color_light)
{
auto rect = a_rect.translated(translation()).intersected(clip_rect());

1
Libraries/LibGfx/Painter.h
View file

@ -45,6 +45,7 @@ public:
~Painter();
void clear_rect(const Rect&, Color);
void fill_rect(const Rect&, Color);
void fill_rect_with_dither_pattern(const Rect&, Color, Color);
void fill_rect_with_checkerboard(const Rect&, const Size&, Color color_dark, Color color_light);
void fill_rect_with_gradient(Orientation, const Rect&, Color gradient_start, Color gradient_end);
void fill_rect_with_gradient(const Rect&, Color gradient_start, Color gradient_end);