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libtxt: insert a placeholder paint record representing the font metrics of an empty run (flutter/engine#4272)

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Jason Simmons 2017-10-24 14:35:02 -07:00 committed by GitHub
parent 848dc59f89
commit e4c9fad5ae
1 changed files with 11 additions and 0 deletions
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11
engine/src/flutter/third_party/txt/src/txt/paragraph.cc vendored
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@ -380,6 +380,17 @@ void Paragraph::Layout(double width, bool force) {
layout.doLayout(text_ptr, 0, text_count, text_count, bidiFlags, font,
minikin_paint, minikin_font_collection);
if (layout.nGlyphs() == 0) {
// This run is empty, so insert a placeholder paint record that captures
// the current font metrics.
SkPaint::FontMetrics metrics;
paint.getFontMetrics(&metrics);
paint_records.emplace_back(run.style, SkPoint::Make(run_x_offset, 0),
builder.make(), metrics, line_number,
layout.getAdvance());
continue;
}
// Break the layout into blobs that share the same SkPaint parameters.
std::vector<Range> glyph_blobs;
for (size_t blob_start = 0; blob_start < layout.nGlyphs();) {