RGBCube/serenity
1
Fork 0
mirror of https://github.com/RGBCube/serenity synced 2025-07-25 06:07:34 +00:00
Code Issues Activity Actions

LibGfx: Skip horizontal edges in path rasterizer

Browse source 
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
parent 4380be9d01
commit 2fa488cfa9
1 changed files with 7 additions and 4 deletions
Download patch file Download diff file Expand all files Collapse all files

11
Userland/Libraries/LibGfx/EdgeFlagPathRasterizer.cpp
View file

@ -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) {