public static string GetFontFamilyName(this IDWriteTextLayout format, uint currentPosition = 0, DWRITE_TEXT_RANGE?range = null)
{
if (format == null)
{
throw new ArgumentNullException(nameof(format));
}
if (range == null)
{
return(call(IntPtr.Zero));
}
using (var mem = new ComMemory(range.Value))
{
return(call(mem.Pointer));
}
string call(IntPtr ptr)
{
format.GetFontFamilyNameLength(currentPosition, out var len, ptr).ThrowOnError();
var s = new string('\0', (int)len);
format.GetFontFamilyName(currentPosition, s, len + 1, ptr).ThrowOnError();
return(s);
}
}
public static void DrawTextLayout(this ID2D1RenderTarget context,
D2D_POINT_2F origin,
IDWriteTextLayout layout,
ID2D1Brush defaultFillBrush = null,
D2D1_DRAW_TEXT_OPTIONS options = D2D1_DRAW_TEXT_OPTIONS.D2D1_DRAW_TEXT_OPTIONS_NONE)
{
if (context == null)
{
throw new ArgumentNullException(nameof(context));
}
if (layout == null)
{
throw new ArgumentNullException(nameof(layout));
}
context.DrawTextLayout(origin, layout, defaultFillBrush, options);
}
public static DWRITE_TEXT_METRICS1 GetMetrics1(this IDWriteTextLayout layout)
{
if (layout == null)
{
throw new ArgumentNullException(nameof(layout));
}
DWRITE_TEXT_METRICS1 metrics1;
if (layout is IDWriteTextLayout2 layout2)
{
layout2.GetMetrics(out metrics1).ThrowOnError();
}
else
{
layout.GetMetrics(out var metrics).ThrowOnError();
metrics1.height = metrics.height;
metrics1.heightIncludingTrailingWhitespace = metrics.height;
metrics1.layoutHeight = metrics.layoutHeight;
metrics1.layoutWidth = metrics.layoutWidth;
metrics1.left = metrics.left;
metrics1.lineCount = metrics.lineCount;
metrics1.maxBidiReorderingDepth = metrics.maxBidiReorderingDepth;
metrics1.top = metrics.top;
metrics1.width = metrics.width;
metrics1.widthIncludingTrailingWhitespace = metrics.widthIncludingTrailingWhitespace;
}
// sometimes, there's a bug where widthIncludingTrailingWhitespace is 0 while width is not...
if (metrics1.widthIncludingTrailingWhitespace < metrics1.width)
{
metrics1.widthIncludingTrailingWhitespace = metrics1.width;
}
if (metrics1.heightIncludingTrailingWhitespace < metrics1.height)
{
metrics1.heightIncludingTrailingWhitespace = metrics1.height;
}
return(metrics1);
}
public static IComObject <IDWriteFontCollection> GetFontCollection(this IDWriteTextLayout format, uint currentPosition = 0, DWRITE_TEXT_RANGE?range = null)
{
if (format == null)
{
throw new ArgumentNullException(nameof(format));
}
if (range == null)
{
return(call(IntPtr.Zero));
}
using (var mem = new ComMemory(range.Value))
{
return(call(mem.Pointer));
}
ComObject <IDWriteFontCollection> call(IntPtr ptr)
{
format.GetFontCollection(currentPosition, out var coll, ptr).ThrowOnError();
return(new ComObject <IDWriteFontCollection>(coll));
}
}
internal DWriteTextLayout(IDWriteTextLayout handle)
{
this.handle = handle;
}
public static void DrawTextLayout(this IComObject <ID2D1RenderTarget> context,
D2D_POINT_2F origin,
IDWriteTextLayout layout,
ID2D1Brush defaultFillBrush = null,
D2D1_DRAW_TEXT_OPTIONS options = D2D1_DRAW_TEXT_OPTIONS.D2D1_DRAW_TEXT_OPTIONS_NONE) => DrawTextLayout(context?.Object, origin, layout, defaultFillBrush, options);
internal DWriteTextLayout(IDWriteTextLayout handle)
{
this.handle = handle;
}
/// <summary>
/// Draws the formatted text described by the specified <see cref="IDWriteTextLayout"/> object.
/// </summary>
/// <param name="origin">The point, described in device-independent pixels, at which the upper-left corner of the text described by textLayout is drawn. </param>
/// <param name="textLayout">The formatted text to draw. Any drawing effects that do not inherit from <see cref="ID2D1Resource" /> are ignored. If there are drawing effects that inherit from <see cref="ID2D1Resource"/> that are not brushes, this method fails and the render target is put in an error state. </param>
/// <param name="defaultForegroundBrush">The <see cref="ID2D1Brush"/> used to paint any text in textLayout that does not already have a brush associated with it as a drawing effect (specified by the <see cref="IDWriteTextLayout.SetDrawingEffect(IUnknown, TextRange)"/> method).</param>
public void DrawTextLayout(Vector2 origin, IDWriteTextLayout textLayout, ID2D1Brush defaultForegroundBrush)
{
DrawTextLayout(origin, textLayout, defaultForegroundBrush, DrawTextOptions.None);
}
private void Release()
{
if (comObject != null)
{
Marshal.ReleaseComObject(comObject);
comObject = null;
setMaxWidth = null;
setMaxHeight = null;
getMaxWidth = null;
getMaxHeight = null;
draw = null;
}
}
internal TextLayout(IntPtr objPtr)
{
Handle = objPtr;
comObject =
(IDWriteTextLayout) Marshal.GetObjectForIUnknown(objPtr);
InitComMethods();
}