public static unsafe void BlockCopy(BitmapContext src, int srcOffset, BitmapContext dest, int destOffset, int count)
{
NativeMethods.CopyUnmanagedMemory((byte *)src.Pixels, srcOffset, (byte *)dest.Pixels, destOffset, count);
}
public static unsafe GrayScaleLetterGlyph CreateGlyph(Typeface typeface, GlyphTypeface glyphTypeface, double size, char ch)
{
if (ch == ' ')
{
return(CreateSpaceGlyph(glyphTypeface, size));
}
FormattedText text = new FormattedText(string.Empty + ch,
CultureInfo.InvariantCulture,
FlowDirection.LeftToRight,
typeface,
size,
Brushes.White);
int width = (int)Math.Ceiling(DpiDetector.DpiXKoef * text.Width);
int height = (int)Math.Ceiling(DpiDetector.DpiYKoef * text.Height);
if (width == 0 || height == 0)
{
return(null);
}
DrawingVisual drawingVisual = new DrawingVisual();
DrawingContext drawingContext = drawingVisual.RenderOpen();
drawingContext.DrawRectangle(Brushes.Black, new Pen(), new Rect(0, 0, width, height));
drawingContext.DrawText(text, new Point(0, 0));
drawingContext.Close();
RenderTargetBitmap bmp = new RenderTargetBitmap(width, height, DpiDetector.DpiXKoef * 96, DpiDetector.DpiYKoef * 96, PixelFormats.Pbgra32);
bmp.Render(drawingVisual);
var res = new List <Item>();
var pixbmp = new WriteableBitmap(bmp);
using (var ctx = new BitmapContext(pixbmp))
{
var pixels = ctx.Pixels;
for (int y = 0; y < height; y++)
{
for (int x = 0; x < width; x++)
{
int color = pixels[(y * width) + x];
byte r, g, b;
double avg;
r = (byte)((color >> 16) & 0xFF);
g = (byte)((color >> 8) & 0xFF);
b = (byte)((color) & 0xFF);
avg = (0.299 * r) + (0.587 * g) + (0.114 * b);
if (avg >= 1)
{
res.Add(new Item
{
X = (short)x,
Y = (short)y,
Alpha = (int)Math.Round(avg / 255.0 * 0x1000),
});
}
}
}
}
return(new GrayScaleLetterGlyph
{
Width = width,
Height = height,
Ch = ch,
Items = res.ToArray(),
});
}
