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LibDraw: Add Painter::clear_rect() for filling a rect without blending

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Sometimes you want to fill a rect with a specific color without alpha
blending it with whatever's already there.
This commit is contained in:
Andreas Kling 2019-11-25 11:34:55 +01:00
parent 029455cb40
commit c645d9fe4a
Notes: sideshowbarker 2024-07-19 11:05:42 +09:00
2 changed files with 24 additions and 8 deletions
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31
Libraries/LibDraw/Painter.cpp
View file

@ -54,6 +54,24 @@ void Painter::fill_rect_with_draw_op(const Rect& a_rect, Color color)
}
}
void Painter::clear_rect(const Rect& a_rect, Color color)
{
auto rect = a_rect.translated(translation()).intersected(clip_rect());
if (rect.is_empty())
return;
ASSERT(m_target->rect().contains(rect));
RGBA32* dst = m_target->scanline(rect.top()) + rect.left();
const size_t dst_skip = m_target->pitch() / sizeof(RGBA32);
for (int i = rect.height() - 1; i >= 0; --i) {
fast_u32_fill(dst, color.value(), rect.width());
dst += dst_skip;
}
}
void Painter::fill_rect(const Rect& a_rect, Color color)
{
if (color.alpha() == 0)
@ -64,6 +82,11 @@ void Painter::fill_rect(const Rect& a_rect, Color color)
return;
}
if (color.alpha() == 0xff) {
clear_rect(a_rect, color);
return;
}
auto rect = a_rect.translated(translation()).intersected(clip_rect());
if (rect.is_empty())
return;
@ -73,14 +96,6 @@ void Painter::fill_rect(const Rect& a_rect, Color color)
RGBA32* dst = m_target->scanline(rect.top()) + rect.left();
const size_t dst_skip = m_target->pitch() / sizeof(RGBA32);
if (color.alpha() == 0xff) {
for (int i = rect.height() - 1; i >= 0; --i) {
fast_u32_fill(dst, color.value(), rect.width());
dst += dst_skip;
}
return;
}
for (int i = rect.height() - 1; i >= 0; --i) {
for (int j = 0; j < rect.width(); ++j)
dst[j] = Color::from_rgba(dst[j]).blend(color).value();

1
Libraries/LibDraw/Painter.h
View file

@ -19,6 +19,7 @@ class Painter {
public:
explicit Painter(GraphicsBitmap&);
~Painter();
void clear_rect(const Rect&, Color);
void fill_rect(const Rect&, Color);
void fill_rect_with_gradient(const Rect&, Color gradient_start, Color gradient_end);
void draw_rect(const Rect&, Color, bool rough = false);