Exemplo n.º 1
0
 /// <summary>
 /// Construct a character string object by extracting text info from text run
 /// </summary>
 internal CharacterBufferRange(TextRun textRun)
 {
     _charBufferRef = textRun.CharacterBufferReference;
     _length        = textRun.Length;
 }
Exemplo n.º 2
0
        /// <summary>
        /// Break a run of text into individually shape items.
        /// Shape items are delimited by
        ///     Change of writing system
        ///     Change of glyph typeface
        /// </summary>
        IList <TextShapeableSymbols> ITextSymbols.GetTextShapeableSymbols(
            GlyphingCache glyphingCache,
            CharacterBufferReference characterBufferReference,
            int length,
            bool rightToLeft,
            bool isRightToLeftParagraph,
            CultureInfo digitCulture,
            TextModifierScope textModifierScope,
            TextFormattingMode textFormattingMode,
            bool isSideways
            )
        {
            if (characterBufferReference.CharacterBuffer == null)
            {
                throw new ArgumentNullException("characterBufferReference.CharacterBuffer");
            }

            int offsetToFirstChar = characterBufferReference.OffsetToFirstChar - _characterBufferReference.OffsetToFirstChar;

            Debug.Assert(characterBufferReference.CharacterBuffer == _characterBufferReference.CharacterBuffer);
            Debug.Assert(offsetToFirstChar >= 0 && offsetToFirstChar < _length);

            if (length < 0 ||
                offsetToFirstChar + length > _length)
            {
                length = _length - offsetToFirstChar;
            }

            // Get the actual text run properties in effect, after invoking any
            // text modifiers that may be in scope.
            TextRunProperties textRunProperties = _textRunProperties;

            if (textModifierScope != null)
            {
                textRunProperties = textModifierScope.ModifyProperties(textRunProperties);
            }

            if (!rightToLeft)
            {
                // Fast loop early out for run with all non-complex characters
                // which can be optimized by not going thru shaping engine.

                int nominalLength;

                if (textRunProperties.Typeface.CheckFastPathNominalGlyphs(
                        new CharacterBufferRange(characterBufferReference, length),
                        textRunProperties.FontRenderingEmSize,
                        (float)textRunProperties.PixelsPerDip,
                        1.0,
                        double.MaxValue, // widthMax
                        true,            // keepAWord
                        digitCulture != null,
                        CultureMapper.GetSpecificCulture(textRunProperties.CultureInfo),
                        textFormattingMode,
                        isSideways,
                        false, //breakOnTabs
                        out nominalLength
                        ) && length == nominalLength)
                {
                    return(new TextShapeableCharacters[]
                    {
                        new TextShapeableCharacters(
                            new CharacterBufferRange(characterBufferReference, nominalLength),
                            textRunProperties,
                            textRunProperties.FontRenderingEmSize,
                            new MS.Internal.Text.TextInterface.ItemProps(),
                            null,   // shapeTypeface (no shaping required)
                            false,  // nullShape,
                            textFormattingMode,
                            isSideways
                            )
                    });
                }
            }

            IList <TextShapeableSymbols> shapeables = new List <TextShapeableSymbols>(2);

            glyphingCache.GetShapeableText(
                textRunProperties.Typeface,
                characterBufferReference,
                length,
                textRunProperties,
                digitCulture,
                isRightToLeftParagraph,
                shapeables,
                this as IShapeableTextCollector,
                textFormattingMode
                );

            return(shapeables);
        }