/// <summary>
/// Renders the <see cref="Duality.Resources.Font"/> using the specified system font.
/// This method assumes that the system font's size and style match the one specified in
/// the specified Duality font.
/// </summary>
private RenderedFontData RenderGlyphs(SysDrawFont internalFont, FontCharSet charSet, bool antialiazing, bool monospace)
{
DualityFont.GlyphData[] glyphs = new DualityFont.GlyphData[charSet.Chars.Length];
for (int i = 0; i < glyphs.Length; i++)
{
glyphs[i].Glyph = charSet.Chars[i];
}
int bodyAscent = 0;
int baseLine = 0;
int descent = 0;
int ascent = 0;
TextRenderingHint textRenderingHint;
if (antialiazing)
{
textRenderingHint = TextRenderingHint.AntiAliasGridFit;
}
else
{
textRenderingHint = TextRenderingHint.SingleBitPerPixelGridFit;
}
int cols;
int rows;
cols = rows = (int)Math.Ceiling(Math.Sqrt(glyphs.Length));
PixelData pixelLayer = new PixelData(
MathF.RoundToInt(cols * internalFont.Size * 1.2f),
MathF.RoundToInt(rows * internalFont.Height * 1.2f),
ColorRgba.TransparentBlack);
PixelData glyphTemp;
PixelData glyphTempTypo;
Bitmap bm;
Bitmap measureBm = new Bitmap(1, 1);
Rect[] atlas = new Rect[glyphs.Length];
using (Graphics measureGraphics = Graphics.FromImage(measureBm))
{
Brush fntBrush = new SolidBrush(Color.Black);
StringFormat formatDef = StringFormat.GenericDefault;
formatDef.LineAlignment = StringAlignment.Near;
formatDef.FormatFlags = 0;
StringFormat formatTypo = StringFormat.GenericTypographic;
formatTypo.LineAlignment = StringAlignment.Near;
int x = 1;
int y = 1;
for (int i = 0; i < glyphs.Length; ++i)
{
string str = glyphs[i].Glyph.ToString(CultureInfo.InvariantCulture);
bool isSpace = str == " ";
SizeF charSize = measureGraphics.MeasureString(str, internalFont, pixelLayer.Width, formatDef);
// Rasterize a single glyph for rendering
bm = new Bitmap((int)Math.Ceiling(Math.Max(1, charSize.Width)), internalFont.Height + 1);
using (Graphics glyphGraphics = Graphics.FromImage(bm))
{
glyphGraphics.Clear(Color.Transparent);
glyphGraphics.TextRenderingHint = textRenderingHint;
glyphGraphics.DrawString(str, internalFont, fntBrush, new RectangleF(0, 0, bm.Width, bm.Height), formatDef);
}
glyphTemp = new PixelData();
glyphTemp.FromBitmap(bm);
// Rasterize a single glyph in typographic mode for metric analysis
if (!isSpace)
{
Point2 glyphTempOpaqueTopLeft;
Point2 glyphTempOpaqueSize;
glyphTemp.GetOpaqueBoundaries(out glyphTempOpaqueTopLeft, out glyphTempOpaqueSize);
glyphTemp.SubImage(glyphTempOpaqueTopLeft.X, 0, glyphTempOpaqueSize.X, glyphTemp.Height);
if (charSet.CharBodyAscentRef.Contains(glyphs[i].Glyph))
{
bodyAscent += glyphTempOpaqueSize.Y;
}
if (charSet.CharBaseLineRef.Contains(glyphs[i].Glyph))
{
baseLine += glyphTempOpaqueTopLeft.Y + glyphTempOpaqueSize.Y;
}
if (charSet.CharDescentRef.Contains(glyphs[i].Glyph))
{
descent += glyphTempOpaqueTopLeft.Y + glyphTempOpaqueSize.Y;
}
bm = new Bitmap((int)Math.Ceiling(Math.Max(1, charSize.Width)), internalFont.Height + 1);
using (Graphics glyphGraphics = Graphics.FromImage(bm))
{
glyphGraphics.Clear(Color.Transparent);
glyphGraphics.TextRenderingHint = textRenderingHint;
glyphGraphics.DrawString(str, internalFont, fntBrush, new RectangleF(0, 0, bm.Width, bm.Height), formatTypo);
}
glyphTempTypo = new PixelData();
glyphTempTypo.FromBitmap(bm);
glyphTempTypo.Crop(true, false);
}
else
{
glyphTempTypo = glyphTemp;
}
// Update xy values if it doesn't fit anymore
if (x + glyphTemp.Width + 2 > pixelLayer.Width)
{
x = 1;
y += internalFont.Height + MathF.Clamp((int)MathF.Ceiling(internalFont.Height * 0.1875f), 3, 10);
}
// Memorize atlas coordinates & glyph data
glyphs[i].Width = glyphTemp.Width;
glyphs[i].Height = glyphTemp.Height;
glyphs[i].OffsetX = glyphTemp.Width - glyphTempTypo.Width;
glyphs[i].OffsetY = 0; // ttf fonts are rendered on blocks that are the whole size of the height - so no need for offset
if (isSpace)
{
glyphs[i].Width /= 2;
glyphs[i].OffsetX /= 2;
}
atlas[i].X = x;
atlas[i].Y = y;
atlas[i].W = glyphTemp.Width;
atlas[i].H = (internalFont.Height + 1);
// Draw it onto the font surface
glyphTemp.DrawOnto(pixelLayer, BlendMode.Solid, x, y);
x += glyphTemp.Width + MathF.Clamp((int)MathF.Ceiling(internalFont.Height * 0.125f), 2, 10);
}
}
// White out texture except alpha channel.
for (int i = 0; i < pixelLayer.Data.Length; i++)
{
pixelLayer.Data[i].R = 255;
pixelLayer.Data[i].G = 255;
pixelLayer.Data[i].B = 255;
}
// Monospace offset adjustments
if (monospace)
{
int maxGlyphWidth = 0;
for (int i = 0; i < glyphs.Length; i++)
{
maxGlyphWidth = Math.Max(maxGlyphWidth, glyphs[i].Width);
}
for (int i = 0; i < glyphs.Length; ++i)
{
glyphs[i].OffsetX -= (int)Math.Round((maxGlyphWidth - glyphs[i].Width) / 2.0f);
}
}
// Determine Font properties
{
float lineSpacing = internalFont.FontFamily.GetLineSpacing(internalFont.Style);
float emHeight = internalFont.FontFamily.GetEmHeight(internalFont.Style);
float cellAscent = internalFont.FontFamily.GetCellAscent(internalFont.Style);
float cellDescent = internalFont.FontFamily.GetCellDescent(internalFont.Style);
ascent = (int)Math.Round(cellAscent * internalFont.Size / emHeight);
bodyAscent /= charSet.CharBodyAscentRef.Length;
baseLine /= charSet.CharBaseLineRef.Length;
descent = (int)Math.Round(((float)descent / charSet.CharDescentRef.Length) - (float)baseLine);
}
// Aggregate rendered and generated data into our return value
FontMetrics metrics = new FontMetrics(
size: internalFont.SizeInPoints,
height: (int)internalFont.Height,
ascent: ascent,
bodyAscent: bodyAscent,
descent: descent,
baseLine: baseLine,
monospace: monospace);
return(new RenderedFontData
{
Bitmap = pixelLayer,
Atlas = atlas,
GlyphData = glyphs,
Metrics = metrics
});
}
