/// <summary>
/// Adds <i>fontFile</i> to this private font collection.
/// </summary>
/// <param name="fontFile">
/// Absolute path to a TrueType font or collection.
/// </param>
/// <exception cref="FileNotFoundException">
/// If <i>fontFile</i> does not exist.
/// </exception>
/// <exception cref="ArgumentException">
/// If <i>fontFile</i> has already been added.
/// </exception>
/// <exception cref="ArgumentException">
/// If <i>fontFile</i> cannot be added to the system font collection.
/// </exception>
public void AddFontFile(FileInfo fontFile)
{
if (fontFile == null)
{
throw new ArgumentNullException("fontFile", "Parameter cannot be null");
}
if (!fontFile.Exists)
{
throw new FileNotFoundException("Font file does not exist", fontFile.FullName);
}
if (fonts.Contains(fontFile.FullName))
{
throw new ArgumentException("Font file already exists", "fontFile");
}
// Dispose needs the font filename to remove it from the system
string absolutePath = fontFile.FullName;
fonts.Add(absolutePath, String.Empty);
// AddFontResourceEx returns the number of fonts added which
// may be greater than 1 if adding a TrueType collection.
if (LibWrapper.AddFontResourceEx(absolutePath, FR_PRIVATE, 0) == 0)
{
throw new ArgumentException("Unable to add font file: " + absolutePath, "fontFile");
}
}
internal GdiFontMetrics(GdiDeviceContent dc, GdiFont currentFont)
{
if (dc.Handle == IntPtr.Zero)
{
throw new ArgumentNullException("dc", "Handle to device context cannot be null");
}
if (dc.GetCurrentObject(GdiDcObject.Font) == IntPtr.Zero)
{
throw new ArgumentException("dc", "No font selected into supplied device context");
}
this.dc = dc;
this.currentFont = currentFont;
// FontFileReader requires the font facename because the font may exist in
// a TrueType collection.
StringBuilder builder = new StringBuilder(255);
LibWrapper.GetTextFace(dc.Handle, builder.Capacity, builder);
faceName = builder.ToString();
ranges = new GdiUnicodeRanges(dc);
reader = new FontFileReader(new MemoryStream(GetFontData()), faceName);
converter = new PdfUnitConverter(EmSquare);
// After we have cached the font data, we can safely delete the resource
currentFont.Dispose();
}
/// <summary>
/// Gets font metric data for a TrueType font or TrueType collection.
/// </summary>
/// <returns></returns>
public byte[] GetFontData()
{
if (data == null)
{
try {
// Check if this is a TrueType font collection
uint ttcfTag = TableNames.ToUint(TableNames.Ttcf);
uint ttcfSize = LibWrapper.GetFontData(dc.Handle, ttcfTag, 0, null, 0);
if (ttcfSize != 0 && ttcfSize != 0xFFFFFFFF)
{
data = ReadFontFromCollection();
}
else
{
data = ReadFont();
}
}
catch (Exception e) {
throw new Exception(
String.Format("Failed to load data for font {0}", FaceName), e);
}
}
return(data);
}
/// <summary>
/// Populates the <i>indices</i> array with the glyph index of each
/// character represented by this rnage starting at <see cref="Start"/>.
/// </summary>
private void LoadGlyphIndices()
{
string characters = BuildString();
indices = new ushort[characters.Length];
LibWrapper.GetGlyphIndices(dc.Handle, characters, characters.Length, indices, 0);
}
protected virtual void Dispose(bool disposing)
{
if (hFont != IntPtr.Zero)
{
//Console.WriteLine("Dispoing of font {0}, {1}pt ({2})", faceName, height, hFont);
LibWrapper.DeleteObject(hFont);
hFont = IntPtr.Zero;
}
}
/// <summary>
/// Returns a list of font styles associated with <i>familyName</i>.
/// </summary>
/// <param name="familyName"></param>
/// <returns></returns>
public FontStyles GetStyles(string familyName)
{
styles.Clear();
FontEnumDelegate font = new FontEnumDelegate(EnumFontMethod);
LibWrapper.EnumFontFamilies(dc.Handle, familyName, font, ExtractStyles);
return(styles);
}
/// <summary>
/// Delete the device context freeing the associated memory.
/// </summary>
protected virtual void Dispose(bool disposing)
{
if (hDC != IntPtr.Zero)
{
LibWrapper.DeleteDC(hDC);
// Mark as deleted
hDC = IntPtr.Zero;
}
}
/// <summary>
/// Delete the device context freeing the associated memory.
/// </summary>
protected virtual void Dispose(bool disposing)
{
if (this.hDC != IntPtr.Zero)
{
//LibWrapper.DeleteDC(hDC);
LibWrapper.ReleaseDC(IntPtr.Zero, this.hDC);
// Mark as deleted
this.hDC = IntPtr.Zero;
}
}
/// <summary>
/// Creates a font based on the supplied typeface name and size.
/// </summary>
/// <param name="faceName">The typeface name of a font.</param>
/// <param name="height">
/// The height, in logical units, of the font's character
/// cell or character.
/// </param>
/// <returns></returns>
public static GdiFont CreateFont(string faceName, int height, bool bold, bool italic)
{
LogFont lf = new LogFont();
lf.lfCharSet = 1; // Default charset
lf.lfFaceName = faceName;
lf.lfHeight = height;
lf.lfWeight = (bold) ? 700 : 0;
lf.lfItalic = Convert.ToByte(italic);
return(new GdiFont(LibWrapper.CreateFontIndirect(lf), faceName, height));
}
private byte[] ReadTableData(string tableName)
{
uint tag = TableNames.ToUint(tableName);
uint size = LibWrapper.GetFontData(dc.Handle, tag, 0, null, 0);
byte[] data = new byte[size];
uint rv = LibWrapper.GetFontData(dc.Handle, tag, 0, data, (uint)data.Length);
if (rv == GdiFontMetrics.GDI_ERROR)
{
throw new Exception("Failed to retrieve table " + tableName);
}
return(data);
}
/// <summary>
/// Loads all the unicode ranges.
/// </summary>
private void LoadRanges(GdiDeviceContent dc)
{
GlyphSet glyphSet = new GlyphSet();
uint size = LibWrapper.GetFontUnicodeRanges(dc.Handle, glyphSet);
if (size == 0)
{
throw new Exception("Unable to retrieve unicode ranges.");
}
unicodeRanges = new UnicodeRange[glyphSet.cRanges];
for (int i = 0, offset = 0; i < glyphSet.cRanges; i++)
{
ushort wcLow = (ushort)(glyphSet.ranges[offset++] + (glyphSet.ranges[offset++] << 8));
ushort cGlyphs = (ushort)(glyphSet.ranges[offset++] + (glyphSet.ranges[offset++] << 8));
unicodeRanges[i] = new UnicodeRange(dc, wcLow, (ushort)(wcLow + cGlyphs - 1));
}
}
private byte[] ReadFont()
{
uint bufferSize = LibWrapper.GetFontData(dc.Handle, 0, 0, null, 0);
if (bufferSize == 0xFFFFFFFF)
{
throw new InvalidOperationException("No font selected into device context");
}
byte[] buffer = new byte[bufferSize];
uint rv = LibWrapper.GetFontData(dc.Handle, 0, 0, buffer, bufferSize);
if (rv == GDI_ERROR)
{
throw new Exception("Failed to retrieve table data for font " + FaceName);
}
return(buffer);
}
/// <summary>
/// Gets a handle to an object of the specified type that has been
/// selected into this device context.
/// </summary>
public IntPtr GetCurrentObject(GdiDcObject objectType)
{
return(LibWrapper.GetCurrentObject(hDC, objectType));
}
/// <summary>
/// Selects a font into a device context (DC). The new object
/// replaces the previous object of the same type.
/// </summary>
/// <param name="font">Handle to object.</param>
/// <returns>A handle to the object being replaced.</returns>
public IntPtr SelectFont(GdiFont font)
{
return(LibWrapper.SelectObject(hDC, font.Handle));
}
/// <summary>
/// Creates a new device context that matches the desktop display surface
/// </summary>
public GdiDeviceContent()
{
//this.hDC = LibWrapper.CreateDC("Display", String.Empty, null, IntPtr.Zero);
this.hDC = LibWrapper.GetDC(IntPtr.Zero);
}
