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libtxt: support fake italic text (flutter/engine#5191)

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The text skew value is based on Blink's implementation.

Fixes https://github.com/flutter/flutter/issues/17351
This commit is contained in:
Jason Simmons
2018-05-07 17:12:03 -07:00
committed by GitHub
parent e36f92ec65
commit ddb2f2ab8f
1 changed files with 6 additions and 2 deletions
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8
engine/src/flutter/third_party/txt/src/txt/paragraph.cc vendored
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@@ -48,11 +48,13 @@ namespace {
class GlyphTypeface {
public:
GlyphTypeface(sk_sp<SkTypeface> typeface, minikin::FontFakery fakery)
: typeface_(std::move(typeface)), fake_bold_(fakery.isFakeBold()) {}
: typeface_(std::move(typeface)),
fake_bold_(fakery.isFakeBold()),
fake_italic_(fakery.isFakeItalic()) {}
bool operator==(GlyphTypeface& other) {
return other.typeface_.get() == typeface_.get() &&
other.fake_bold_ == fake_bold_;
other.fake_bold_ == fake_bold_ && other.fake_italic_ == fake_italic_;
}
bool operator!=(GlyphTypeface& other) { return !(*this == other); }
@@ -60,11 +62,13 @@ class GlyphTypeface {
void apply(SkPaint& paint) {
paint.setTypeface(typeface_);
paint.setFakeBoldText(fake_bold_);
paint.setTextSkewX(fake_italic_ ? -SK_Scalar1 / 4 : 0);
}
private:
sk_sp<SkTypeface> typeface_;
bool fake_bold_;
bool fake_italic_;
};
GlyphTypeface GetGlyphTypeface(const minikin::Layout& layout, size_t index) {