public static int FT_Open_Face(IntPtr library, FreeTypeStreamWrapper streamWrapper, long face_index, out FT_Face aface)
{
var args = streamWrapper.FT_Open_ArgsWin32;
var result = _FT_Open_Face_Win32(library, ref args, (Win32Long)face_index, out var afacePointer);
aface = new FT_Face(afacePointer);
return(result);
}
public static Font RenderFromStream(GraphicsContext graphics, Stream stream, uint fontSize, IEnumerable <char> characters, byte alpha = 0)
{
if (graphics == null)
{
throw new ArgumentNullException(nameof(graphics));
}
if (stream == null)
{
throw new ArgumentNullException(nameof(stream));
}
int fontWidth = 0;
int fontHeight = 0;
int fontLineHeight = 0;
var characterSurfaces = new Dictionary <char, Surface>();
var characterData = new Dictionary <char, Font.Character>();
FT_Init_FreeType(out IntPtr library);
using (var streamWrapper = new FreeTypeStreamWrapper(stream))
{
if (FT_Open_Face(library, streamWrapper, 0, out var face) != 0)
{
throw new PixelCannonException("Could not open font.");
}
FT_Set_Pixel_Sizes(face, 0, fontSize);
if (FT_Load_Char(face, 'M', FT_LOAD_RENDER) != 0)
{
throw new PixelCannonException($"Could not load character 'M'.");
}
var glyph = face.Glyph();
var metrics = glyph.Metrics();
var bitmap = glyph.Bitmap();
fontWidth = (int)bitmap.width;
fontHeight = (int)bitmap.rows;
fontLineHeight = (int)(metrics.height / 64);
foreach (var ch in characters)
{
if (FT_Load_Char(face, ch, FT_LOAD_RENDER) != 0)
{
throw new PixelCannonException($"Could not load character '{ch}'.");
}
glyph = face.Glyph();
metrics = glyph.Metrics();
bitmap = glyph.Bitmap();
var width = (int)(metrics.width / 64);
var height = (int)(metrics.height / 64);
var offsetX = (int)(metrics.horiBearingX / 64);
var offsetY = fontLineHeight - (int)(metrics.horiBearingY / 64);
var advance = glyph.Advance();
characterSurfaces[ch] = RenderGlyph(bitmap, alpha);
var data = new Character()
{
Width = width,
Height = height,
OffsetX = offsetX,
OffsetY = offsetY,
AdvanceX = (int)(advance.x / 64),
AdvanceY = (int)(advance.y / 64),
};
characterData[ch] = data;
}
FT_Done_FreeType(library);
}
var surface = RenderSheet(characterSurfaces, characterData, fontWidth, fontHeight, alpha);
return(new Font(surface.ToTexture(graphics), characterData, fontLineHeight));
}
