// ###############################################################################
// ### M E T H O D S
// ###############################################################################
#region Methods
/// <summary>Prepare a font or fonteset for utilization with Xrw.</summary>
/// <param name="fontSpecification">The font specification, that identifies a font/fontset.<see cref="System.String"/></param>
/// <param name="x11display">The display pointer, that specifies the connection to the X server.<see cref="IntPtr"/></param>
/// <param name="useFontset">The flag defining whether to use a fontset or a single font.<see cref="System.Boolean"/></param>
/// <param name="fontData">The resulting font data on success, or null otherwise.<see cref="X11.X11FontData"/></param>
/// <returns>True on success, or false otherwise.<see cref="System.Boolean"/></returns>
public static bool PrepareFont(string fontSpecification, IntPtr x11display, bool useFontset, ref X11.X11FontData fontData)
{
fontData = null;
foreach (KeyValuePair <FontDataKey, X11FontData> loadedFont in _loadedFonts)
{
if (loadedFont.Key.FontSpecification == fontSpecification && loadedFont.Key.X11Display == x11display && loadedFont.Key.UseFontset)
{
fontData = loadedFont.Value;
return(true);
}
}
FontDataKey key = new FontDataKey(fontSpecification, x11display, useFontset);
if (useFontset)
{
IntPtr missingCharsetList;
TInt missingCharsetCount;
X11.XID fontsetResourceId = X11lib.XCreateFontSet(x11display, fontSpecification, out missingCharsetList,
out missingCharsetCount, IntPtr.Zero);
// Check whether directly matching fontset has been loaded, and - if not - load the most similar fontset (fuzzy).
int fuzzyFactor = 0;
string fuzzyFontSpecification = (fontsetResourceId == (X11.XID) 0 ? fontSpecification : null);
while (fontsetResourceId == (X11.XID) 0 && fuzzyFactor < 3)
{
string lastFuzzyFontSpecification = fuzzyFontSpecification;
if (fuzzyFactor == 0)
{
fuzzyFontSpecification = X11FontData.ModifyFontSpecificationStretch(fuzzyFontSpecification, "*");
}
if (fuzzyFactor == 1)
{
fuzzyFontSpecification = X11FontData.ModifyFontSpecificationWieght(fuzzyFontSpecification, "*");
}
if (fuzzyFactor == 2)
{
fuzzyFontSpecification = X11FontData.ModifyFontSpecificationSlant(fuzzyFontSpecification, "*");
}
fuzzyFactor++;
// Safe time if no change has been made.
if (lastFuzzyFontSpecification == fuzzyFontSpecification)
{
continue;
}
if (!string.IsNullOrEmpty(lastFuzzyFontSpecification) && lastFuzzyFontSpecification.Trim() != "")
{
fontsetResourceId = X11lib.XCreateFontSet(x11display, fuzzyFontSpecification, out missingCharsetList,
out missingCharsetCount, IntPtr.Zero);
if (fontsetResourceId != (X11.XID) 0)
{
SimpleLog.LogLine(TraceEventType.Information, CLASS_NAME +
"::PrepareFont () Fuzzy load fontset with specification '" + fuzzyFontSpecification + "' " +
"instead of '" + fontSpecification + "' succeeded.");
}
}
}
// Check whether directly matching or most similar fontset has been loaded, and - if not - load a fallback fontset.
string extFontSpecification = null;
if (fontsetResourceId == (X11.XID) 0)
{
// Let the font server guess a fallback fontset.
if (!string.IsNullOrEmpty(fontSpecification) && fontSpecification.Trim() != "" && !fontSpecification.Trim().EndsWith(",*"))
{
extFontSpecification = fontSpecification + ",*";
SimpleLog.LogLine(TraceEventType.Warning, CLASS_NAME +
"::PrepareFont () Can not load a fontset with specification '" + fontSpecification + "'.");
SimpleLog.LogLine(TraceEventType.Information, CLASS_NAME +
"::PrepareFont () Retry to load a fontset with specification '" + extFontSpecification + "'.");
fontsetResourceId = X11lib.XCreateFontSet(x11display, extFontSpecification, out missingCharsetList,
out missingCharsetCount, IntPtr.Zero);
}
// The font specification already includs a joker to guess a fallback fontset.
else
{
SimpleLog.LogLine(TraceEventType.Error, CLASS_NAME +
"::PrepareFont () Can not load a fontset with specification '" + fontSpecification + "'.");
// No success at all - even with a guess of a fallback fontset!
return(false);
}
}
// Check whether matching fontset has been loaded.
if (fontsetResourceId == (X11.XID) 0)
{
SimpleLog.LogLine(TraceEventType.Error, CLASS_NAME +
"::PrepareFont () Can not load a fontset with specification '" + extFontSpecification + "'.");
// No success at all - even with a guess of a fallback fontset!
return(false);
}
if (!string.IsNullOrEmpty(extFontSpecification))
{
SimpleLog.LogLine(TraceEventType.Information, CLASS_NAME +
"::PrepareFont () Successfully loaded best matching fontset for specification '" + fontSpecification + "' " +
"using specification '" + extFontSpecification + "'.");
}
else if (!string.IsNullOrEmpty(fuzzyFontSpecification))
{
SimpleLog.LogLine(TraceEventType.Information, CLASS_NAME +
"::PrepareFont () Successfully loaded best matching fontset for specification '" + fontSpecification + "' " +
"using specification '" + fuzzyFontSpecification + "'.");
}
else
{
SimpleLog.LogLine(TraceEventType.Information, CLASS_NAME +
"::PrepareFont () Successfully loaded best matching fontset for specification '" + fontSpecification + "'.");
}
for (int countCharSet = 0; countCharSet < (int)missingCharsetCount; countCharSet++)
{
IntPtr p = Marshal.ReadIntPtr(missingCharsetList, countCharSet * Marshal.SizeOf(typeof(IntPtr)));
string s = Marshal.PtrToStringAuto(p);
if (!string.IsNullOrEmpty(extFontSpecification))
{
SimpleLog.LogLine(TraceEventType.Warning, CLASS_NAME +
"::PrepareFont () Fontset for specification '" + extFontSpecification + "' is missing font for charset '" + s + "'.");
}
else if (!string.IsNullOrEmpty(fuzzyFontSpecification))
{
SimpleLog.LogLine(TraceEventType.Warning, CLASS_NAME +
"::PrepareFont () Fontset for specification '" + fuzzyFontSpecification + "' is missing font for charset '" + s + "'.");
}
else
{
SimpleLog.LogLine(TraceEventType.Warning, CLASS_NAME +
"::PrepareFont () Fontset for specification '" + fontSpecification + "' is missing font for charset '" + s + "'.");
}
}
// Calculate maximum font height, ascent and descent.
int ascent = 0;
int descent = 0;
X11lib.XFontSetExtents extents = X11lib.XExtentsOfFontSet(fontsetResourceId);
X11lib.XFontStruct[] fontStructArray;
string[] fontNameArray;
int maxFonts;
maxFonts = X11lib.XFontsOfFontSet(fontsetResourceId, out fontStructArray, out fontNameArray);
for (int countFonts = 0; countFonts < maxFonts; countFonts++)
{
if (ascent < (int)fontStructArray[countFonts].ascent)
{
ascent = (int)fontStructArray[countFonts].ascent;
}
if (descent < (int)fontStructArray[countFonts].descent)
{
descent = (int)fontStructArray[countFonts].descent;
}
}
string finalFontSpecification = null;
if (!string.IsNullOrEmpty(extFontSpecification))
{
finalFontSpecification = extFontSpecification;
}
else if (!string.IsNullOrEmpty(fuzzyFontSpecification))
{
finalFontSpecification = fuzzyFontSpecification;
}
else
{
finalFontSpecification = fontSpecification;
}
// Maximum font height, ascent and descent might be frequently used for calculation.
fontData = X11FontData.NewFontSetData(finalFontSpecification, x11display, fontsetResourceId,
(int)extents.max_logical_extent.height, ascent, descent);
IntPtr gc = X11lib.XCreateGC(x11display, X11lib.XDefaultRootWindow(x11display), 0, IntPtr.Zero);
if (gc != IntPtr.Zero)
{
fontData.SetTypicalCharWidth(AverageCharacterWidth(x11display, gc, fontData));
X11lib.XFreeGC(x11display, gc);
}
_loadedFonts.Add(key, fontData);
return(true);
}
// Use font, if fontset isn't supported.
else // of (useFontset)
{
// Load font and query font structure (to get maximum font height, ascent and descent).
IntPtr fontStructure = X11lib.XLoadQueryFont(x11display, fontSpecification);
// Check whether directly matching font has been loaded, and - if not - load the most similar font (fuzzy).
int fuzzyFactor = 0;
string fuzzyFontSpecification = (fontStructure == IntPtr.Zero ? fontSpecification : null);
while (fontStructure == IntPtr.Zero && fuzzyFactor < 3)
{
string lastFuzzyFontSpecification = fuzzyFontSpecification;
if (fuzzyFactor == 0)
{
fuzzyFontSpecification = X11FontData.ModifyFontSpecificationStretch(fuzzyFontSpecification, "*");
}
if (fuzzyFactor == 1)
{
fuzzyFontSpecification = X11FontData.ModifyFontSpecificationWieght(fuzzyFontSpecification, "*");
}
if (fuzzyFactor == 2)
{
fuzzyFontSpecification = X11FontData.ModifyFontSpecificationSlant(fuzzyFontSpecification, "*");
}
fuzzyFactor++;
// Safe time if no change has been made.
if (lastFuzzyFontSpecification == fuzzyFontSpecification)
{
continue;
}
if (!string.IsNullOrEmpty(lastFuzzyFontSpecification) && lastFuzzyFontSpecification.Trim() != "")
{
fontStructure = X11lib.XLoadQueryFont(x11display, lastFuzzyFontSpecification);
if (fontStructure != IntPtr.Zero)
{
SimpleLog.LogLine(TraceEventType.Information, CLASS_NAME +
"::PrepareFont () Fuzzy load font with specification '" + fuzzyFontSpecification + "' " +
"instead of '" + fontSpecification + "' succeeded.");
}
}
}
// Check whether directly matching or most similar font has been loaded, and - if not - load a fallback font.
string extFontSpecification = null;
if (fontStructure != IntPtr.Zero)
{
// Let the font server guess a fallback fontset.
if (!string.IsNullOrEmpty(fontSpecification) && fontSpecification.Trim() != "" && !fontSpecification.Trim().EndsWith(",*"))
{
extFontSpecification = fontSpecification + ",*";
SimpleLog.LogLine(TraceEventType.Warning, CLASS_NAME +
"::PrepareFont () Can not load a fontset with specification '" + fontSpecification + "'.");
SimpleLog.LogLine(TraceEventType.Information, CLASS_NAME +
"::PrepareFont () Retry to load a fontset with specification '" + extFontSpecification + "'.");
fontStructure = X11lib.XLoadQueryFont(x11display, extFontSpecification);
}
// The font specification already includs a joker to guess a fallback fontset.
else
{
SimpleLog.LogLine(TraceEventType.Error, CLASS_NAME +
"::PrepareFont () Can not load a font with specification '" + fontSpecification + "'.");
// No success at all - even with a guess of a fallback font!
return(false);
}
}
// Check whether matching font has been loaded.
if (fontStructure == IntPtr.Zero)
{
SimpleLog.LogLine(TraceEventType.Error, CLASS_NAME +
"::PrepareFont () Can not load a font with specification '" + fontSpecification + "'.");
// No success at all - even with a guess of a fallback font!
return(false);
}
if (!string.IsNullOrEmpty(extFontSpecification))
{
SimpleLog.LogLine(TraceEventType.Information, CLASS_NAME +
"::PrepareFont () Successfully loaded best matching font for specification '" + fontSpecification + "' " +
"using specification '" + extFontSpecification + "'.");
}
else if (!string.IsNullOrEmpty(fuzzyFontSpecification))
{
SimpleLog.LogLine(TraceEventType.Information, CLASS_NAME +
"::PrepareFont () Successfully loaded best matching font for specification '" + fontSpecification + "' " +
"using specification '" + fuzzyFontSpecification + "'.");
}
else
{
SimpleLog.LogLine(TraceEventType.Information, CLASS_NAME +
"::PrepareFont () Successfully loaded best matching font for specification '" + fontSpecification + "'.");
}
X11lib.XFontStruct fs = (X11lib.XFontStruct)Marshal.PtrToStructure(fontStructure, typeof(X11lib.XFontStruct));
string finalFontSpecification = null;
if (!string.IsNullOrEmpty(extFontSpecification))
{
finalFontSpecification = extFontSpecification;
}
else if (!string.IsNullOrEmpty(fuzzyFontSpecification))
{
finalFontSpecification = fuzzyFontSpecification;
}
else
{
finalFontSpecification = fontSpecification;
}
// Maximum font height, ascent and descent might be frequently used for calculation.
fontData = X11FontData.NewSingleFontData(finalFontSpecification, x11display, fs.fid,
(int)fs.ascent + (int)fs.descent, (int)fs.ascent, (int)fs.descent);
IntPtr gc = X11lib.XCreateGC(x11display, X11lib.XDefaultRootWindow(x11display), 0, IntPtr.Zero);
if (gc != IntPtr.Zero)
{
fontData.SetTypicalCharWidth(AverageCharacterWidth(x11display, gc, fontData));
X11lib.XFreeGC(x11display, gc);
}
_loadedFonts.Add(key, fontData);
return(true);
}
}
