private bool PopulateGlyphCache(uint ch, out Glyph glyph, Color?defaultColor)
{
var resolution = (uint)(BaseDPI * Font.DPIPercent / 100);
var size = Font.GetFTSize(_SizePoints, resolution);
uint index;
if (ch == '\t')
{
index = Font.Face.GetCharIndex(' ');
}
else
{
index = Font.Face.GetCharIndex(ch);
}
if (index <= 0)
{
glyph = default(Glyph);
return(false);
}
var flags = LoadFlags.Render;
if (!Font.EnableBitmaps)
{
flags |= LoadFlags.NoBitmap;
}
if (!Font.Hinting)
{
flags |= LoadFlags.NoHinting;
}
if (Font.Monochrome)
{
flags |= LoadFlags.Monochrome;
}
else
{
flags |= LoadFlags.Color;
}
Font.Face.LoadGlyph(
index, flags, Font.Monochrome ? LoadTarget.Mono : LoadTarget.Normal
);
var sizeMetrics = size.Metrics;
var ftgs = Font.Face.Glyph;
var scaleX = sizeMetrics.ScaleX;
var scaleY = sizeMetrics.ScaleY;
var bitmap = ftgs.Bitmap;
DynamicAtlas <Color> .Reservation texRegion = default(DynamicAtlas <Color> .Reservation);
if ((bitmap.Width > 0) && (bitmap.Rows > 0))
{
texRegion = Upload(bitmap);
}
var ascender = sizeMetrics.Ascender.ToSingle();
var glyphMetrics = ftgs.Metrics;
var advance = glyphMetrics.HorizontalAdvance.ToSingle();
if (ch == '\t')
{
advance *= Font.TabSize;
}
var scaleFactor = 100f / Font.DPIPercent;
var widthMetric = glyphMetrics.Width.ToSingle();
var bearingXMetric = glyphMetrics.HorizontalBearingX.ToSingle();
var rect = texRegion.Rectangle;
glyph = new SrGlyph {
Character = ch,
Width = widthMetric,
LeftSideBearing = bearingXMetric,
RightSideBearing = (
advance -
widthMetric -
glyphMetrics.HorizontalBearingX.ToSingle()
),
XOffset = ftgs.BitmapLeft - bearingXMetric - Font.GlyphMargin,
YOffset = -ftgs.BitmapTop + ascender - Font.GlyphMargin + Font.VerticalOffset + VerticalOffset,
RectInTexture = rect,
// FIXME: This will become invalid if the extra spacing changes
// FIXME: Scale the spacing appropriately based on ratios
LineSpacing = sizeMetrics.Height.ToSingle() + ExtraLineSpacing,
DefaultColor = defaultColor,
Baseline = sizeMetrics.Ascender.ToSingle()
};
if (texRegion.Atlas != null)
{
glyph.Texture = texRegion.Atlas;
glyph.BoundsInTexture = texRegion.Atlas.BoundsFromRectangle(in rect);
}
// HACK
if (ch <= 0xCFFF)
{
// Some fonts have weirdly-sized space characters
if (char.IsWhiteSpace((char)ch))
{
glyph.RightSideBearing = (float)Math.Round(glyph.RightSideBearing);
}
}
if (ch < LowCacheSize)
{
LowCache[ch] = glyph;
}
Cache[ch] = glyph;
return(true);
}
