/// <summary>
/// Performs shaping on the native buffer using the specified font..
/// </summary>
private unsafe void Shape(UltravioletFontFace fontFace, out hb_glyph_info_t *infos, out hb_glyph_position_t *positions, out UInt32 count)
{
ValidateUnicodeProperties();
var ftFontFace = fontFace as FreeTypeFontFace;
if (ftFontFace == null)
{
throw new NotSupportedException(FreeTypeStrings.TextShaperRequiresFreeTypeFont);
}
PopulateNativeBuffer();
if (lastUsedFont != ftFontFace && lastUsedFontNative != IntPtr.Zero)
{
hb_font_destroy(lastUsedFontNative);
lastUsedFont = null;
lastUsedFontNative = IntPtr.Zero;
}
var fontNative = (lastUsedFontNative == IntPtr.Zero) ? hb_ft_font_create(ftFontFace.NativePointer, IntPtr.Zero) : lastUsedFontNative;
var fontLoadFlags = ftFontFace.IsStroked ? FT_LOAD_NO_BITMAP : FT_LOAD_COLOR;
hb_ft_font_set_load_flags(fontNative, fontLoadFlags);
lastUsedFont = ftFontFace;
lastUsedFontNative = fontNative;
hb_shape(fontNative, native, IntPtr.Zero, 0);
var glyphCount = 0u;
infos = (hb_glyph_info_t *)hb_buffer_get_glyph_infos(native, (IntPtr)(&glyphCount));
positions = (hb_glyph_position_t *)hb_buffer_get_glyph_positions(native, IntPtr.Zero);
count = glyphCount;
}
private unsafe void CreateShapedChar(hb_glyph_info_t *info, hb_glyph_position_t *position, Int32 cluster, out ShapedChar result)
{
var cGlyphIndex = (Int32)info->codepoint;
var cOffsetX = (Int16)Math.Round(position->x_offset / 64f, MidpointRounding.AwayFromZero);
var cOffsetY = (Int16)Math.Round(position->y_offset / 64f, MidpointRounding.AwayFromZero);
var cAdvance = (Int16)Math.Round((position->x_advance == 0 ? position->y_advance : position->x_advance) / 64f, MidpointRounding.AwayFromZero);
result = new ShapedChar(cGlyphIndex, cluster, cOffsetX, cOffsetY, cAdvance);
}