SkPlainTextEditor Namespace Reference

Classes
class	Editor
struct	ShapeResult
struct	Span
class	StringSlice

Typedefs
using	StringView = Span< const char >

Functions
ShapeResult	Shape (const char *ut8text, size_t textByteLen, const SkFont &font, sk_sp< SkFontMgr > fontMgr, const char *locale, float width)

Typedef Documentation

StringView

using SkPlainTextEditor::StringView = typedef Span<const char>

Definition at line 16 of file stringview.h.

Function Documentation

Shape()

ShapeResult SkPlainTextEditor::Shape	(	const char *	ut8text,
		size_t	textByteLen,
		const SkFont &	font,
		sk_sp< SkFontMgr >	fontMgr,
		const char *	locale,
		float	width
	)

Definition at line 301 of file shape.cpp.

{
    ShapeResult result;
    if (SkUTF::CountUTF8(utf8Text, textByteLen) < 0) {
        utf8Text = nullptr;
        textByteLen = 0;
    }
    std::unique_ptr<SkShaper> shaper = nullptr;
#if defined(SK_SHAPER_HARFBUZZ_AVAILABLE) && defined(SK_SHAPER_UNICODE_AVAILABLE)
    auto unicode = get_unicode();
    shaper = SkShapers::HB::ShaperDrivenWrapper(unicode, fontMgr);
#else
    shaper = SkShapers::Primitive::PrimitiveText();
#endif
    SkASSERT(shaper);
 
    float height = font.getSpacing();
    RunHandler runHandler(utf8Text, textByteLen);
    if (textByteLen) {
        result.glyphBounds.resize(textByteLen);
        for (SkRect& c : result.glyphBounds) {
            c = SkRect{-FLT_MAX, -FLT_MAX, -FLT_MAX, -FLT_MAX};
        }
        runHandler.setRunCallback(set_character_bounds, result.glyphBounds.data());
 
        static constexpr uint8_t kBidiLevelLTR = 0;
        std::unique_ptr<SkShaper::BiDiRunIterator> bidi = nullptr;
#if defined(SK_SHAPER_HARFBUZZ_AVAILABLE) && defined(SK_SHAPER_UNICODE_AVAILABLE)
        bidi = SkShapers::unicode::BidiRunIterator(
                unicode, utf8Text, textByteLen, kBidiLevelLTR);
#endif
        if (!bidi) {
            bidi = std::make_unique<SkShaper::TrivialBiDiRunIterator>(kBidiLevelLTR, textByteLen);
        }
        SkASSERT(bidi);
 
        std::unique_ptr<SkShaper::LanguageRunIterator> language =
                SkShaper::MakeStdLanguageRunIterator(utf8Text, textByteLen);
        SkASSERT(language);
 
        std::unique_ptr<SkShaper::ScriptRunIterator> script =
                SkShaper::MakeScriptRunIterator(utf8Text, textByteLen, SkSetFourByteTag('Z','z','z','z'));
        SkASSERT(script);
 
        std::unique_ptr<SkShaper::FontRunIterator> fontRuns =
                SkShaper::MakeFontMgrRunIterator(utf8Text, textByteLen, font, fontMgr);
        SkASSERT(fontRuns);
 
        shaper->shape(utf8Text,
                      textByteLen,
                      *fontRuns,
                      *bidi,
                      *script,
                      *language,
                      nullptr,
                      0,
                      width,
                      &runHandler);
        if (runHandler.lineEndOffsets().size() > 1) {
            result.lineBreakOffsets = runHandler.lineEndOffsets();
            SkASSERT(result.lineBreakOffsets.size() > 0);
            result.lineBreakOffsets.pop_back();
        }
        height = std::max(height, runHandler.endPoint().y());
        result.blob = runHandler.makeBlob();
    }
    result.glyphBounds.push_back(runHandler.finalRect(font));
    result.verticalAdvance = (int)ceilf(height);
    result.wordBreaks = GetUtf8WordBoundaries(utf8Text, textByteLen, locale);
    return result;
}