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Improve stroke handling in DrawingTracer by simulating line join.

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This commit is contained in:
Duan Yao 2014-06-19 11:06:54 +08:00
parent b9899d8d4a
commit 5fdc4cbb36
1 changed files with 4 additions and 0 deletions
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4
src/DrawingTracer.cc
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@ -141,6 +141,10 @@ void DrawingTracer::stroke(GfxState * state)
// 1. path steps that are not vertical or horizontal lines may still falsely "cover" many chars, // 1. path steps that are not vertical or horizontal lines may still falsely "cover" many chars,
// can we slice those steps further? // can we slice those steps further?
// 2. if the line width is small, can we just ignore the path? // 2. if the line width is small, can we just ignore the path?
// 3. line join feature can't be retained. We use line-cap-square to minimize the problem that
// some chars actually covered by a line join are missed. However chars covered by a acute angle
// with line-join-miter may be still recognized as not covered.
cairo_set_line_cap(cairo, CAIRO_LINE_CAP_SQUARE);
GfxPath * path = state->getPath(); GfxPath * path = state->getPath();
for (int i = 0; i < path->getNumSubpaths(); ++i) { for (int i = 0; i < path->getNumSubpaths(); ++i) {
GfxSubpath * subpath = path->getSubpath(i); GfxSubpath * subpath = path->getSubpath(i);