/// <summary>
/// Initializes a new instance of the XRect class.
/// </summary>
public XRect(XPoint location, XSize size)
{
if (size.IsEmpty)
{
this = s_empty;
}
else
{
_x = location.X;
_y = location.Y;
_width = size.Width;
_height = size.Height;
}
}
/// <summary>
/// Measure string directly from font data.
/// </summary>
public static XSize MeasureString(string text, XFont font, XStringFormat stringFormat)
{
XSize size = new XSize();
OpenTypeDescriptor descriptor = FontDescriptorCache.GetOrCreateDescriptorFor(font) as OpenTypeDescriptor;
if (descriptor != null)
{
// Height is the sum of ascender and descender.
size.Height = (descriptor.Ascender + descriptor.Descender) * font.Size / font.UnitsPerEm;
Debug.Assert(descriptor.Ascender > 0);
bool symbol = descriptor.FontFace.cmap.symbol;
int length = text.Length;
int width = 0;
for (int idx = 0; idx < length; idx++)
{
char ch = text[idx];
// HACK: Unclear what to do here.
if (ch < 32)
{
continue;
}
if (symbol)
{
// Remap ch for symbol fonts.
ch = (char)(ch | (descriptor.FontFace.os2.usFirstCharIndex & 0xFF00)); // @@@ refactor
// Used | instead of + because of: http://pdfsharp.codeplex.com/workitem/15954
}
int glyphIndex = descriptor.CharCodeToGlyphIndex(ch);
width += descriptor.GlyphIndexToWidth(glyphIndex);
}
// What? size.Width = width * font.Size * (font.Italic ? 1 : 1) / descriptor.UnitsPerEm;
size.Width = width * font.Size / descriptor.UnitsPerEm;
// Adjust bold simulation.
if ((font.GlyphTypeface.StyleSimulations & XStyleSimulations.BoldSimulation) == XStyleSimulations.BoldSimulation)
{
// Add 2% of the em-size for each character.
// Unsure how to deal with white space. Currently count as regular character.
size.Width += length * font.Size * Const.BoldEmphasis;
}
}
Debug.Assert(descriptor != null, "No OpenTypeDescriptor.");
return(size);
}
/// <summary>
/// Returns the rectangle that results from expanding the specified rectangle by the specified Size, in all directions.
/// </summary>
public static XRect Inflate(XRect rect, XSize size)
{
rect.Inflate(size.Width, size.Height);
return(rect);
}
/// <summary>
/// Expands the rectangle by using the specified Size, in all directions.
/// </summary>
public void Inflate(XSize size)
{
Inflate(size.Width, size.Height);
}
static XSize()
{
s_empty = CreateEmptySize();
}
/// <summary>
/// Indicates whether this instance and a specified size are equal.
/// </summary>
public bool Equals(XSize value)
{
return(Equals(this, value));
}
