private bool LoadGlyphDataCached()
{
string glyphPath = Path.Combine(Program.cachePath, GetCacheFilename() + ".bin");
if (!File.Exists(glyphPath))
{
return(false);
}
using (Stream stream = File.Open(glyphPath, FileMode.Open))
{
using (BinaryReader reader = new BinaryReader(stream))
{
int fileVersion = reader.ReadInt32();
if (fileVersion != version)
{
return(false);
}
int length = reader.ReadInt32();
glyphs = new FontGlyph[length];
for (int i = 0; i < glyphs.Length; ++i)
{
glyphs[i].BinaryRead(reader);
}
}
}
return(true);
}
private byte[] GetGlyphData(IntPtr surfacePtr, FontGlyph glyph, out int width, out int height)
{
SDL.SDL_Surface surface = Marshal.PtrToStructure <SDL.SDL_Surface>(surfacePtr);
SDL.SDL_PixelFormat surfaceFormat = Marshal.PtrToStructure <SDL.SDL_PixelFormat>(surface.format);
IntPtr surfaceData = surface.pixels;
int surfacePitch = surface.pitch;
int ascent = GetAscent();
int descent = GetDescent();
byte[] data = new byte[glyph.width * glyph.height * surfaceFormat.BytesPerPixel];
unsafe
{
byte *src = (byte *)surfaceData;
int rowBytes = glyph.width * surfaceFormat.BytesPerPixel;
int offsetX = glyph.minX;
int offsetY = -glyph.minY + (ascent - glyph.height);
// bug in SDL_ttf?:
// some glyphs have parts rendered outside the surface area
if (offsetY < 0)
{
offsetY = 0;
}
if (offsetX < 0)
{
offsetX = 0;
}
src += offsetY * surfacePitch;
src += offsetX * surfaceFormat.BytesPerPixel;
for (int i = 0; i < glyph.height; i++)
{
Marshal.Copy((IntPtr)src, data, i * rowBytes, rowBytes);
src += surfacePitch;
}
}
width = glyph.width;
height = glyph.height;
return(data);
}
private void GenerateGlyphData(ushort characterCount)
{
Log.Info("Font: Generating glyph data for {0} characters", characterCount);
glyphs = new FontGlyph[characterCount];
for (ushort i = 0; i < characterCount; ++i)
{
if (SDL_ttf.TTF_GlyphIsProvided(handle, i) == 0)
{
continue;
}
if (SDL_ttf.TTF_GlyphMetrics(handle, i,
out glyphs[i].minX, out glyphs[i].maxX, out glyphs[i].minY, out glyphs[i].maxY,
out glyphs[i].advance) != 0)
{
throw new ApplicationException("Failed to get glyph metrics for glyph " + i + " : " + SDL.SDL_GetError());
}
}
}
