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LibGfx: Fix clipping in fill_ellipse

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fill_ellipse used to clip the bounding box, so instead of drawing a
part of an ellipse it drew a smaller ellipse. This commit fixes this
behaviour.
This commit is contained in:
Egor Ananyin 2021-05-08 20:15:03 +03:00 committed by Linus Groh
parent 5eb062d8d3
commit 782dc348fd
Notes: sideshowbarker 2024-07-18 18:26:10 +09:00 
Author: https://github.com/Cleverking2003
Commit: https://github.com/SerenityOS/serenity/commit/782dc348fd2
Pull-request: https://github.com/SerenityOS/serenity/pull/6956
Issue: https://github.com/SerenityOS/serenity/issues/6920
Reviewed-by: https://github.com/linusg
1 changed files with 4 additions and 8 deletions
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12
Userland/Libraries/LibGfx/Painter.cpp
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@ -255,14 +255,10 @@ void Painter::fill_ellipse(const IntRect& a_rect, Color color)
VERIFY(m_target->rect().contains(rect));
RGBA32* dst = m_target->scanline(rect.top()) + rect.left() + rect.width() / 2;
const size_t dst_skip = m_target->pitch() / sizeof(RGBA32);
for (int i = 0; i < rect.height(); i++) {
double y = rect.height() * 0.5 - i;
double x = rect.width() * sqrt(0.25 - y * y / rect.height() / rect.height());
fast_u32_fill(dst - (int)x, color.value(), 2 * (int)x);
dst += dst_skip;
for (int i = 1; i < a_rect.height(); i++) {
double y = a_rect.height() * 0.5 - i;
double x = a_rect.width() * sqrt(0.25 - y * y / a_rect.height() / a_rect.height());
draw_line({ a_rect.x() + a_rect.width() / 2 - (int)x, a_rect.y() + i }, { a_rect.x() + a_rect.width() / 2 + (int)x - 1, a_rect.y() + i }, color);
}
}