protected override void ReleaseResource()
{
IntPtr ptr = this.pointer;
if (ptr != IntPtr.Zero)
{
FreeTypeAPI.FT_Done_FreeType(ptr);
this.pointer = IntPtr.Zero;
}
}
/// <summary>
/// 初始化FreeType库
/// </summary>
public FreeTypeLibrary()
{
int ret = FreeTypeAPI.FT_Init_FreeType(out this.pointer);
if (ret != 0)
{
throw new Exception("Could not init freetype library!");
}
this.obj = (FT_Library)Marshal.PtrToStructure(this.pointer, typeof(FT_Library));
}
/// <summary>
/// 初始化字体库
/// </summary>
/// <param name="library"></param>
/// <param name="fontFullname"></param>
/// <param name="size"></param>
public FreeTypeFace(FreeTypeLibrary library, string fontFullname)//, int size)
{
int ret = FreeTypeAPI.FT_New_Face(library.pointer, fontFullname, 0, out pointer);
if (ret != 0)
{
throw new Exception("Could not open font");
}
this.obj = (FT_Face)Marshal.PtrToStructure(pointer, typeof(FT_Face));
}
/// <summary>
/// 把字形转换为纹理
/// </summary>
/// <param name="face"></param>
/// <param name="c"></param>
public FreeTypeBitmapGlyph(FreeTypeFace face, char c, int size)
{
// Freetype measures the font size in 1/64th of pixels for accuracy
// so we need to request characters in size*64
// 设置字符大小？
FreeTypeAPI.FT_Set_Char_Size(face.pointer, size << 6, size << 6, 96, 96);
// Provide a reasonably accurate estimate for expected pixel sizes
// when we later on create the bitmaps for the font
// 设置像素大小？
FreeTypeAPI.FT_Set_Pixel_Sizes(face.pointer, size, size);
// We first convert the number index to a character index
// 根据字符获取其编号
//int index = FreeTypeAPI.FT_Get_Char_Index(face.pointer, Convert.ToChar(c));
int index = FreeTypeAPI.FT_Get_Char_Index(face.pointer, c);
// Here we load the actual glyph for the character
// 加载此字符的字形
{
int ret = FreeTypeAPI.FT_Load_Glyph(face.pointer, index, FT_LOAD_TYPES.FT_LOAD_DEFAULT);
if (ret != 0)
{
throw new Exception(string.Format("Could not load character '{0}'", Convert.ToChar(c)));
}
}
{
int ret = FreeTypeAPI.FT_Get_Glyph(face.obj.glyphrec, out this.pointer);
if (ret != 0)
{
return;
}
this.glyphRec = (FT_GlyphRec)Marshal.PtrToStructure(face.obj.glyphrec, typeof(FT_GlyphRec));
}
FreeTypeAPI.FT_Glyph_To_Bitmap(out this.pointer, FT_RENDER_MODES.FT_RENDER_MODE_NORMAL, 0, 1);
this.obj = (FT_BitmapGlyph)Marshal.PtrToStructure(this.pointer, typeof(FT_BitmapGlyph));
}
