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Fix linewidth transformations

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The transformation determinant is signed, but we're only interested in
the absolute scale for transforming linewidths.

Signed-off-by: Elias Naur <mail@eliasnaur.com>
This commit is contained in:
Elias Naur 2020-08-24 16:09:43 +02:00
parent 72e2dfab3d
commit cfd57361c4
1 changed files with 1 additions and 1 deletions
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2
piet-gpu/shader/elements.comp
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@ -373,7 +373,7 @@ void main() {
anno_stroke.rgba_color = stroke.rgba_color;
vec2 lw = get_linewidth(st);
anno_stroke.bbox = st.bbox + vec4(-lw, lw);
anno_stroke.linewidth = st.linewidth * sqrt(st.mat.x * st.mat.w - st.mat.y * st.mat.z);
anno_stroke.linewidth = st.linewidth * sqrt(abs(st.mat.x * st.mat.w - st.mat.y * st.mat.z));
AnnotatedRef out_ref = AnnotatedRef((st.path_count - 1) * Annotated_size);
Annotated_Stroke_write(out_ref, anno_stroke);
break;