C++字体库开发之可变字体路径获取十五

本文作者原创，首发在本博客；CSDN 上的同名文章已标注为转载并回链到本页：https://blog.csdn.net/qq_30220519/article/details/144888119

skia

auto data
	= SkData::MakeFromFileName("D:\\可变字体woff\\DecovarAlpha-VF.ttf");
auto typefaceTest = SkTypeface::MakeFromData(data);
SkFontArguments::VariationPosition::Coordinate coordinates[15];
auto ret = typefaceTest->getVariationDesignPosition(coordinates, 15);

SkPath path;
SkFont font(typefaceTest, 1);
font.getPath(21, &path);	// 'T'
path.dump();

SkFontArguments skFontArguments;
SkFontArguments::VariationPosition::Coordinate coordinate;
coordinate.axis = 1414679875;	// 'T' 'R' 'M' 'C'
coordinate.value = 1000;
SkFontArguments::VariationPosition variationPosition;
variationPosition.coordinates = &coordinate;
variationPosition.coordinateCount = 1;
skFontArguments.setVariationDesignPosition(variationPosition);
auto newTypeFace = typefaceTest->makeClone(skFontArguments);
ret = newTypeFace->getVariationDesignPosition(coordinates, 15);

SkFont fontVariant(newTypeFace, 1);
fontVariant.getPath(21, &path); // 'T'
path.dump();

freetype

auto fontMgr = SkFontMgr_New_Custom_Empty();
auto freetypeTypeface = fontMgr->makeFromData(skData);
SkPath            pathFreetype;
SkFont           fontFreetype(freetypeTypeface, 1);
fontFreetype.getPath(129, &pathFreetype);
pathFreetype.dump();

SkAutoSTMalloc<4, FT_Fixed> coords(data.getAxisCount());
for (int i = 0; i < data.getAxisCount(); ++i) {
	coords[i] = data.getAxis()[i];
}
if (FT_Set_Var_Design_Coordinates(rec->fFace.get(), data.getAxisCount(), coords.get())) {
	LOG_INFO("INFO: font %s has variations, but specified variations could not be set.\n",
			 rec->fFace->family_name);
	return;
}

参考

Variable Fonts

Axis-Praxis: Variable Fonts in the browser

C++字体库开发之freetype vs harfbuzz sfnt表，字体名称，可变轴八_c++ 使用的freetype库-CSDN博客

C++字体库开发之WOFF字体解析十四-CSDN博客

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