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LibGfx: Skip horizontal edges in path rasterizer

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Only the vertical parts of edges are plotted (then accumulated
horizontally). Fully horizontal edges won't be plotted (and just result
in NaNs).
This commit is contained in:
MacDue 2024-01-02 20:33:34 +00:00 • committed by Andreas Kling
commit 2fa488cfa9
Notes: sideshowbarker 2024-07-17 22:41:14 +09:00
1 changed files with 7 additions and 4 deletions
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11
Userland/Libraries/LibGfx/EdgeFlagPathRasterizer.cpp
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@ -70,16 +70,19 @@ static Vector<Detail::Edge> prepare_edges(ReadonlySpan<FloatLine> lines, unsigne
if (max_y < top_clip)
continue;
float start_x = p0.x();
float end_x = p1.x();
auto start_x = p0.x();
auto end_x = p1.x();
auto dx = end_x - start_x;
auto dy = max_y - min_y;
if (dy == 0)
continue;
auto dxdy = dx / dy;
// Trim off the non-visible portions of the edge.
if (min_y < top_clip) {
start_x += (top_clip - min_y) * dxdy;
start_x += dxdy * (top_clip - min_y);
min_y = top_clip;
}
if (max_y > bottom_clip) {