private static extern uint GetGlyphOutline(IntPtr hdc, uint ch, uint format, out GLYPHMETRICS gm, uint cb, IntPtr buffer, ref MAT2 mat2);
public GlyphDescriptorCollection CollectGlyphs(IAtlasDescriptor descriptor, Action<float> progress, CancellationTokenSource cts)
{
ValidateSettings(descriptor);
GlyphDescriptorCollection glyphs = new GlyphDescriptorCollection();
HashSet<char> chars = null;
if (descriptor.UseFonts)
{
chars = new HashSet<char>();
// build set of characters
foreach (ICharSet charSet in descriptor.CharSets)
{
foreach (char ch in charSet.Characters)
{
chars.Add(ch);
}
}
}
int count = 0;
count += (descriptor.UseImages) ? descriptor.Images.Count : 0;
count += (chars != null) ? chars.Count : 0;
int current = 0;
if (descriptor.UseImages)
{
int ch = descriptor.StartCode;
foreach (ImageInfo ii in descriptor.Images)
{
int width = ii.Image.Width;
int height = ii.Image.Height;
Vec2i offset;
Image image = CropImage(ii.Image, out offset);
ABC abc = new ABC();
abc.abcA = -(int)ii.Offset.X;
abc.abcB = (uint)(width + ii.Offset.X);
abc.abcC = 0;
ii.SortCode = ii.HasCustomCode ? ii.Code : UniqueCode(ref ch, descriptor.Images);
var gi = new GlyphDescriptor((char)ii.SortCode, abc, image, descriptor.Spacing * 2);
gi.Offset = offset - (Vec2i)ii.Offset;
gi.ImageInfo = ii;
glyphs.Add(gi);
if (progress != null)
{
progress((float)(++current) / count);
}
if (cts != null)
{
cts.Token.ThrowIfCancellationRequested();
}
}
}
if (descriptor.UseFonts)
{
// build image for each glyph
var gm = new GLYPHMETRICS();
foreach (char ch in chars)
{
Image image = null;
try
{
if (ch == 159)
{
}
image = TextHelper.GetGlyphOutlineImage(descriptor.Font, ch, out gm);
if (image == null)
{
continue;
}
}
catch
{
if (image != null)
{
image.Dispose();
}
// skip glyph
continue;
}
// flip Y offset
ABC abc = new ABC();
TextHelper.GetCharABCWidths(descriptor.Font, ch, out abc);
GlyphDescriptor glyph = new GlyphDescriptor(ch, abc, image, descriptor.Spacing * 2);
glyph.Offset = new Vec2i(gm.gmptGlyphOrigin.X, -gm.gmptGlyphOrigin.Y);
glyphs.Add(glyph);
if (progress != null)
{
progress((float)(++current) / count);
}
if (cts != null)
{
cts.Token.ThrowIfCancellationRequested();
}
}
if (descriptor.ForceSpace && glyphs.Find(32) == null)
{
ABC abc = new ABC();
TextHelper.GetCharABCWidths(descriptor.Font, (char)32, out abc);
abc.abcB = (uint)(abc.abcA + abc.abcB + abc.abcC);
abc.abcC = 0;
glyphs.Add(new GlyphDescriptor((char)32, abc));
}
}
return glyphs;
}
public static Image GetGlyphOutlineImage(Font font, char ch, out GLYPHMETRICS gm)
{
byte[] alpha;
int size;
using (FontDC dc = new FontDC(font))
{
MAT2 mat = new MAT2();
mat.eM11.value = 1;
mat.eM22.value = 1;
size = (int)GetGlyphOutline(dc.handle, ch, (uint)GlyphOutline.GGO_GRAY8_BITMAP, out gm, 0, IntPtr.Zero, ref mat);
if (size <= 0)
{
return null;
}
IntPtr bufptr = Marshal.AllocHGlobal(size);
try
{
alpha = new byte[size];
GetGlyphOutline(dc.handle, ch, (uint)GlyphOutline.GGO_GRAY8_BITMAP, out gm, (uint)size, bufptr, ref mat);
Marshal.Copy(bufptr, alpha, 0, size);
}
finally
{
Marshal.FreeHGlobal(bufptr);
}
}
int stride = (int)(gm.gmBlackBoxX + 3) & ~3; // dword alinged
Bitmap bmp = new Bitmap(stride, (int)gm.gmBlackBoxY, PixelFormat.Format32bppArgb);
BitmapData bd = bmp.LockBits(new Rectangle(0, 0, bmp.Width, bmp.Height), ImageLockMode.WriteOnly, PixelFormat.Format32bppArgb);
int bmpSize = bd.Stride * bd.Height;
byte[] bmpValues = new byte[bmpSize];
Marshal.Copy(bd.Scan0, bmpValues, 0, bmpSize);
const int bias = 0x40;
for (int i = 0; i < size; i++)
{
byte v = (byte)((int)alpha[i] * 255 / bias);
bmpValues[i * 4 + 0] = 0xff;
bmpValues[i * 4 + 1] = 0xff;
bmpValues[i * 4 + 2] = 0xff;
bmpValues[i * 4 + 3] = v;
}
Marshal.Copy(bmpValues, 0, bd.Scan0, bmpSize);
bmp.UnlockBits(bd);
return bmp;
}