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GrTessellator (AA): simplify boundary extraction.

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Perform boundary simplification and meshing inline with extraction.

Removed EdgeList::fNext (don't need to concatenate edge lists).
Removed new_contour() (don't need to heap-allocate them either).

BUG=skia:

Change-Id: I0f89bad105c03f3021b0d2f021064f408a361b59
Reviewed-on: https://skia-review.googlesource.com/8794
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Stephen White <senorblanco@chromium.org>
This commit is contained in:
Stephen White 2017-02-23 16:50:47 -05:00 committed by Skia Commit-Bot
parent c777b88c63
commit 5ad721e946
1 changed files with 11 additions and 24 deletions
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35
src/gpu/GrTessellator.cpp
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@ -417,10 +417,9 @@ struct Edge {
};
struct EdgeList {
EdgeList() : fHead(nullptr), fTail(nullptr), fNext(nullptr) {}
EdgeList() : fHead(nullptr), fTail(nullptr) {}
Edge* fHead;
Edge* fTail;
EdgeList* fNext;
void insert(Edge* edge, Edge* prev, Edge* next) {
list_insert<Edge, &Edge::fLeft, &Edge::fRight>(edge, prev, next, &fHead, &fTail);
}
@ -607,13 +606,6 @@ Poly* new_poly(Poly** head, Vertex* v, int winding, SkArenaAlloc& alloc) {
return poly;
}
EdgeList* new_contour(EdgeList** head, SkArenaAlloc& alloc) {
EdgeList* contour = alloc.make<EdgeList>();
contour->fNext = *head;
*head = contour;
return contour;
}
Vertex* append_point_to_contour(const SkPoint& p, Vertex* prev, Vertex** head,
SkArenaAlloc& alloc) {
Vertex* v = alloc.make<Vertex>(p, 255);
@ -1621,20 +1613,19 @@ void extract_boundary(EdgeList* boundary, Edge* e, SkPath::FillType fillType, Sk
}
}
// Stage 5b: Extract boundary edges.
// Stage 5b: Extract boundaries from mesh, simplify and stroke them into a new mesh.
EdgeList* extract_boundaries(const VertexList& mesh, SkPath::FillType fillType,
SkArenaAlloc& alloc) {
LOG("extracting boundaries\n");
remove_non_boundary_edges(mesh, fillType, alloc);
EdgeList* boundaries = nullptr;
for (Vertex* v = mesh.fHead; v != nullptr; v = v->fNext) {
void extract_boundaries(const VertexList& inMesh, VertexList* outMesh, SkPath::FillType fillType,
Comparator& c, SkArenaAlloc& alloc) {
remove_non_boundary_edges(inMesh, fillType, alloc);
for (Vertex* v = inMesh.fHead; v; v = v->fNext) {
while (v->fFirstEdgeBelow) {
EdgeList* boundary = new_contour(&boundaries, alloc);
extract_boundary(boundary, v->fFirstEdgeBelow, fillType, alloc);
EdgeList boundary;
extract_boundary(&boundary, v->fFirstEdgeBelow, fillType, alloc);
simplify_boundary(&boundary, c, alloc);
boundary_to_aa_mesh(&boundary, outMesh, c, alloc);
}
}
return boundaries;
}
// This is a driver function which calls stages 2-5 in turn.
@ -1685,12 +1676,8 @@ Poly* contours_to_polys(Vertex** contours, int contourCnt, SkPath::FillType fill
contours_to_mesh(contours, contourCnt, antialias, &mesh, c, alloc);
sort_and_simplify(&mesh, c, alloc);
if (antialias) {
EdgeList* boundaries = extract_boundaries(mesh, fillType, alloc);
VertexList aaMesh;
for (EdgeList* boundary = boundaries; boundary != nullptr; boundary = boundary->fNext) {
simplify_boundary(boundary, c, alloc);
boundary_to_aa_mesh(boundary, &aaMesh, c, alloc);
}
extract_boundaries(mesh, &aaMesh, fillType, c, alloc);
sort_and_simplify(&aaMesh, c, alloc);
return tessellate(aaMesh, alloc);
} else {