/// <inheritdoc/>
public override void AppendTo(ShapedStringBuilder builder, UltravioletFontFace fontFace, Int32 start, Int32 length, Int32 sourceIndexOffset = 0)
{
Contract.Require(builder, nameof(builder));
Contract.Require(fontFace, nameof(fontFace));
Contract.EnsureRange(start >= 0 && start < rawstr.Length, nameof(start));
Contract.EnsureRange(length >= 0 && start + length <= rawstr.Length, nameof(length));
Contract.EnsureNotDisposed(this, Disposed);
unsafe
{
Shape(fontFace, out var glyphInfo, out var glyphPosition, out var glyphCount);
var end = start + length;
for (var i = 0; i < glyphCount; i++)
{
var cluster = (Int32)glyphInfo->cluster;
if (cluster >= start)
{
if (cluster >= end)
{
break;
}
CreateShapedChar(glyphInfo, glyphPosition, sourceIndexOffset + cluster, out var sc);
builder.Append(sc);
}
glyphInfo++;
glyphPosition++;
}
}
}
/// <summary>
/// Performs shaping on the native buffer using the specified font..
/// </summary>
private unsafe void Shape(UltravioletFontFace fontFace, out hb_glyph_info_t *infos, out hb_glyph_position_t *positions, out UInt32 count)
{
ValidateUnicodeProperties();
var ftFontFace = fontFace as FreeTypeFontFace;
if (ftFontFace == null)
{
throw new NotSupportedException(FreeTypeStrings.TextShaperRequiresFreeTypeFont);
}
PopulateNativeBuffer();
if (lastUsedFont != ftFontFace && lastUsedFontNative != IntPtr.Zero)
{
hb_font_destroy(lastUsedFontNative);
lastUsedFont = null;
lastUsedFontNative = IntPtr.Zero;
}
var fontNative = (lastUsedFontNative == IntPtr.Zero) ? hb_ft_font_create(ftFontFace.NativePointer, IntPtr.Zero) : lastUsedFontNative;
var fontLoadFlags = ftFontFace.IsStroked ? FT_LOAD_NO_BITMAP : FT_LOAD_COLOR;
hb_ft_font_set_load_flags(fontNative, fontLoadFlags);
lastUsedFont = ftFontFace;
lastUsedFontNative = fontNative;
hb_shape(fontNative, native, IntPtr.Zero, 0);
var glyphCount = 0u;
infos = (hb_glyph_info_t *)hb_buffer_get_glyph_infos(native, (IntPtr)(&glyphCount));
positions = (hb_glyph_position_t *)hb_buffer_get_glyph_positions(native, IntPtr.Zero);
count = glyphCount;
}
/// <summary>
/// Gets the absolute position of the text when rendered.
/// </summary>
/// <param name="font">The font with which the command is being rendered.</param>
/// <param name="x">The x-coordinate of the top-left corner of the line of text that is being rendered.</param>
/// <param name="y">The y-coordinate of the top-left corner of the line of text that is being rendered.</param>
/// <param name="lineHeight">The height of the line of text that is being rendered.</param>
/// <returns>A <see cref="Vector2"/> that describes the absolute position of the text.</returns>
public Vector2 GetAbsolutePositionVector(UltravioletFontFace font, Single x, Single y, Int32 lineHeight)
{
var lineHeightSansDescender = lineHeight + font.Descender;
var textHeightSansDescender = textHeight + font.Descender;
return(new Vector2(x + textX, (y - font.Descender) + textY + ((lineHeightSansDescender - textHeightSansDescender) / 2)));
}
/// <summary>
/// Gets the absolute bounds of the text when rendered.
/// </summary>
/// <param name="font">The font with which the command is being rendered.</param>
/// <param name="x">The x-coordinate of the top-left corner of the line of text that is being rendered.</param>
/// <param name="y">The y-coordinate of the top-left corner of the line of text that is being rendered.</param>
/// <param name="lineHeight">The height of the line of text that is being rendered.</param>
/// <returns>A <see cref="Rectangle"/> that describes the absolute bounds of the text.</returns>
public Rectangle GetAbsoluteBounds(UltravioletFontFace font, Int32 x, Int32 y, Int32 lineHeight)
{
var lineHeightSansDescender = lineHeight + font.Descender;
var textHeightSansDescender = textHeight + font.Descender;
return(new Rectangle(x + textX, (y - font.Descender) + textY + ((lineHeightSansDescender - textHeightSansDescender) / 2), textWidth, textHeight));
}
/// <summary>
/// Gets the absolute position of the text when rendered.
/// </summary>
/// <param name="font">The font with which the command is being rendered.</param>
/// <param name="x">The x-coordinate of the top-left corner of the line of text that is being rendered.</param>
/// <param name="y">The y-coordinate of the top-left corner of the line of text that is being rendered.</param>
/// <param name="lineHeight">The height of the line of text that is being rendered.</param>
/// <returns>A <see cref="Point2"/> that describes the absolute position of the text.</returns>
public Point2 GetAbsolutePosition(UltravioletFontFace font, Int32 x, Int32 y, Int32 lineHeight)
{
var lineHeightSansDescender = lineHeight + font.Descender;
var textHeightSansDescender = textHeight + font.Descender;
return(new Point2(x + textX, (y - font.Descender) + textY + ((lineHeightSansDescender - textHeightSansDescender) / 2)));
}
/// <summary>
/// Appends the contents of the specified <see cref="TextShaper"/> to the end of the
/// current <see cref="ShapedStringBuilder"/> instance.
/// </summary>
/// <param name="shaper">The <see cref="TextShaper"/> instance from which to append values.</param>
/// <param name="fontFace">The font face with which to shape the string.</param>
/// <returns>A reference to this instance after the append operation has completed.</returns>
public ShapedStringBuilder Append(TextShaper shaper, UltravioletFontFace fontFace)
{
Contract.Require(shaper, nameof(shaper));
shaper.AppendTo(this, fontFace);
return(this);
}
/// <summary>
/// Gets the absolute bounds of the text when rendered.
/// </summary>
/// <param name="font">The font with which the command is being rendered.</param>
/// <param name="x">The x-coordinate of the top-left corner of the line of text that is being rendered.</param>
/// <param name="y">The y-coordinate of the top-left corner of the line of text that is being rendered.</param>
/// <param name="lineWidth">The width of the line of text that is being rendered.</param>
/// <param name="lineHeight">The height of the line of text that is being rendered.</param>
/// <param name="direction">The direction in which the text is oriented.</param>
/// <returns>A <see cref="Rectangle"/> that describes the absolute bounds of the text.</returns>
public Rectangle GetAbsoluteBounds(UltravioletFontFace font, Int32 x, Int32 y, Int32 lineWidth, Int32 lineHeight, TextDirection direction)
{
var lineHeightSansDescender = lineHeight + font.Descender;
var textHeightSansDescender = TextHeight + font.Descender;
var absX = (direction == TextDirection.RightToLeft) ? (x + lineWidth) - (TextX + TextWidth) : x + TextX;
var absY = (y - font.Descender) + TextY + ((lineHeightSansDescender - textHeightSansDescender) / 2);
return(new Rectangle(absX, absY, TextWidth, TextHeight));
}
/// <summary>
/// Gets the absolute position of the text when rendered.
/// </summary>
/// <param name="font">The font with which the command is being rendered.</param>
/// <param name="x">The x-coordinate of the top-left corner of the line of text that is being rendered.</param>
/// <param name="y">The y-coordinate of the top-left corner of the line of text that is being rendered.</param>
/// <param name="lineWidth">The width of the line of text that is being rendered.</param>
/// <param name="lineHeight">The height of the line of text that is being rendered.</param>
/// <param name="direction">The direction in which the text is oriented.</param>
/// <returns>A <see cref="Vector2"/> that describes the absolute position of the text.</returns>
public Vector2 GetAbsolutePositionVector(UltravioletFontFace font, Single x, Single y, Int32 lineWidth, Int32 lineHeight, TextDirection direction)
{
var lineHeightSansDescender = lineHeight + font.Descender;
var textHeightSansDescender = TextHeight + font.Descender;
var absX = (direction == TextDirection.RightToLeft) ? (x + lineWidth) - (TextX + TextWidth) : x + TextX;
var absY = (y - font.Descender) + TextY + ((lineHeightSansDescender - textHeightSansDescender) / 2);
return(new Vector2(absX, absY));
}
/// <summary>
/// Initializes a new instance of the <see cref="TextLayoutToken"/> structure.
/// </summary>
/// <param name="text">The token's text.</param>
/// <param name="bounds">The token's bounds relative to its layout region.</param>
/// <param name="fontFace">The token's font face.</param>
/// <param name="icon">The token's icon.</param>
/// <param name="glyphShader">The token's glyph shader.</param>
/// <param name="color">The token's color.</param>
internal TextLayoutToken(StringSegment text, Rectangle bounds, UltravioletFontFace fontFace, TextIconInfo?icon, GlyphShader glyphShader, Color?color)
{
this.text = text;
this.bounds = bounds;
this.fontFace = fontFace;
this.icon = icon;
this.glyphShader = glyphShader;
this.color = color;
}
/// <summary>
/// Initializes a new instance of the <see cref="ShapedString"/> class.
/// </summary>
/// <param name="fontFace">The font face with which the string was created.</param>
/// <param name="language">The name of the language which this string contains.</param>
/// <param name="script">A <see cref="TextScript"/> value specifying which script which this string contains.</param>
/// <param name="direction">A <see cref="TextDirection"/> value specifying the direction in which this string should be written.</param>
/// <param name="value">An array of <see cref="ShapedChar"/> values.</param>
/// <param name="startIndex">The starting position within <paramref name="value"/>.</param>
/// <param name="count">The number of characters within <paramref name="value"/> to use.</param>
public ShapedString(UltravioletFontFace fontFace, String language, TextScript script, TextDirection direction, ShapedChar[] value, Int32 startIndex, Int32 count)
{
Contract.Require(fontFace, nameof(fontFace));
Contract.Require(language, nameof(language));
Contract.Require(value, nameof(value));
this.FontFace = fontFace;
this.Language = language;
this.Script = script;
this.Direction = direction;
this.buffer = CreateShapedString(value, startIndex, count);
}
/// <summary>
/// Initializes a new instance of the <see cref="ShapedString"/> class.
/// </summary>
/// <param name="fontFace">The font face with which the string was created.</param>
/// <param name="language">The name of the language which this string contains.</param>
/// <param name="script">A <see cref="TextScript"/> value specifying which script which this string contains.</param>
/// <param name="direction">A <see cref="TextDirection"/> value specifying the direction in which this string should be written.</param>
/// <param name="value">An array of <see cref="ShapedChar"/> values.</param>
public ShapedString(UltravioletFontFace fontFace, String language, TextScript script, TextDirection direction, ShapedChar[] value)
{
Contract.Require(fontFace, nameof(fontFace));
Contract.Require(language, nameof(language));
Contract.Require(value, nameof(value));
this.FontFace = fontFace;
this.Language = language;
this.Script = script;
this.Direction = direction;
this.buffer = CreateShapedString(value, 0, value?.Length ?? 0);
}
/// <inheritdoc/>
public override ShapedString CreateShapedString(UltravioletFontFace fontFace, Int32 start, Int32 length, Int32 sourceIndexOffset = 0)
{
Contract.Require(fontFace, nameof(fontFace));
Contract.EnsureRange(start >= 0 && start < rawstr.Length, nameof(start));
Contract.EnsureRange(length >= 0 && start + length <= rawstr.Length, nameof(length));
Contract.EnsureNotDisposed(this, Disposed);
unsafe
{
Shape(fontFace, out var glyphInfo, out var glyphPosition, out var glyphCount);
var end = start + length;
var chars = new ShapedChar[glyphCount];
var charsCount = 0;
for (var i = 0; i < glyphCount; i++)
{
var cluster = (Int32)glyphInfo->cluster;
if (cluster >= start)
{
if (cluster >= end)
{
break;
}
switch (rawstr[cluster])
{
case '\n':
chars[i] = new ShapedChar('\n', sourceIndexOffset + cluster, Int16.MaxValue, Int16.MaxValue, Int16.MaxValue);
break;
case '\t':
chars[i] = new ShapedChar('\t', sourceIndexOffset + cluster, Int16.MaxValue, Int16.MaxValue, Int16.MaxValue);
break;
default:
CreateShapedChar(glyphInfo, glyphPosition, sourceIndexOffset + cluster, out chars[i]);
break;
}
charsCount++;
}
glyphInfo++;
glyphPosition++;
}
return(new ShapedString(fontFace, GetLanguage(), GetScript(), GetDirection(), chars, 0, charsCount));
}
}
/// <inheritdoc/> public override void AppendTo(ShapedStringBuilder builder, UltravioletFontFace fontFace, Int32 sourceIndexOffset = 0) => AppendTo(builder, fontFace, 0, rawstr.Length, sourceIndexOffset);
/// <summary> /// Converts the value of the current <see cref="ShapedStringBuilder"/> to a new <see cref="ShapedString"/> instance. /// </summary> /// <param name="fontFace">The font face with which the string was created.</param> /// <param name="language">The name of the language which this string contains.</param> /// <param name="script">A <see cref="TextScript"/> value specifying which script which this string contains.</param> /// <param name="direction">A <see cref="TextDirection"/> value specifying the direction in which this string should be written.</param> /// <returns>The <see cref="ShapedString"/> instance which was created.</returns> public ShapedString ToShapedString(UltravioletFontFace fontFace, String language, TextScript script, TextDirection direction) => new ShapedString(fontFace, language, script, direction, buffer, 0, length);
/// <summary> /// Appends the contents of a subset of this shaping buffer to the specified <see cref="ShapedStringBuilder"/> instance. /// </summary> /// <param name="builder">The <see cref="ShapedStringBuilder"/> instance to which to append this shaper's contents.</param> /// <param name="fontFace">The font face with which to shape the string.</param> /// <param name="start">The offset of the character in the original string which corresponds to the beginning of the shaped substring.</param> /// <param name="length">The number of characters in the raw substring from which to create the shaped substring.</param> /// <param name="sourceIndexOffset">The offset which is applied to the source indices assigned to shaped characters in the resulting string.</param> public abstract void AppendTo(ShapedStringBuilder builder, UltravioletFontFace fontFace, Int32 start, Int32 length, Int32 sourceIndexOffset = 0);
/// <summary> /// Creates a new <see cref="ShapedString"/> instance from a subset of the current contents of the shaping buffer. /// </summary> /// <param name="fontFace">The font face with which to shape the string.</param> /// <param name="start">The offset of the character in the original string which corresponds to the beginning of the shaped substring.</param> /// <param name="length">The number of characters in the raw substring from which to create the shaped substring.</param> /// <param name="sourceIndexOffset">The offset which is applied to the source indices assigned to shaped characters in the resulting string.</param> /// <returns>A new shaped string instance.</returns> public abstract ShapedString CreateShapedString(UltravioletFontFace fontFace, Int32 start, Int32 length, Int32 sourceIndexOffset = 0);
/// <inheritdoc/> public override ShapedString CreateShapedString(UltravioletFontFace fontFace, Int32 sourceIndexOffset = 0) => CreateShapedString(fontFace, 0, rawstr.Length, sourceIndexOffset);
