/// <summary>Loads the character array (<see cref="Css.TextRenderingProperty.Characters"/>) from the given text string.</summary>
internal void LoadCharacters(string text, RenderableData renderable)
{
if (Characters != null && Visible)
{
// Make sure each char goes offscreen:
NowOffScreen();
// Clear visible:
Visible = false;
}
// Get the computed style:
ComputedStyle computedStyle = renderable.computedStyle;
// No longer dirty:
Dirty = false;
char[] characters = text.ToCharArray();
// Get text transform:
int textTransform = computedStyle.ResolveInt(Css.Properties.TextTransform.GlobalProperty);
if (textTransform != TextTransformMode.None && characters.Length > 0)
{
switch (textTransform)
{
case TextTransformMode.Capitalize:
// Uppercase the first character:
characters[0] = char.ToUpper(characters[0]);
break;
case TextTransformMode.Lowercase:
// Lowercase the whole string:
for (int i = 0; i < characters.Length; i++)
{
characters[i] = char.ToLower(characters[i]);
}
break;
case TextTransformMode.Uppercase:
// Uppercase the whole string:
for (int i = 0; i < characters.Length; i++)
{
characters[i] = char.ToUpper(characters[i]);
}
break;
}
}
// Get the whitespace mode:
int whiteSpaceMode = computedStyle.WhiteSpaceX;
// Purge characters that we don't want:
if ((whiteSpaceMode & WhiteSpaceMode.NormalOrNoWrap) != 0)
{
// Dump breaks and repeated whitespace.
bool dumpWhiteSpace = false;
for (int i = 0; i < characters.Length; i++)
{
char character = characters[i];
if (character == '\t')
{
// Dump:
characters[i] = '\0';
}
else if (character == '\r' || character == '\n')
{
// Dump:
characters[i] = '\0';
// Dump whitespaces immediately after these:
dumpWhiteSpace = true;
continue;
}
else if (character == '\u00A0')
{
// NBSP:
characters[i] = ' ';
}
else if (character == ' ')
{
if (dumpWhiteSpace)
{
// Dump:
characters[i] = '\0';
}
else
{
// Dump any consecutive whitespace (except for ):
dumpWhiteSpace = true;
}
continue;
}
dumpWhiteSpace = false;
}
}
else if (whiteSpaceMode == WhiteSpaceMode.PreLine)
{
// Dump repeated whitespace (and \r) only.
bool dumpWhiteSpace = false;
for (int i = 0; i < characters.Length; i++)
{
char character = characters[i];
if (character == ' ')
{
if (dumpWhiteSpace)
{
// Dump:
characters[i] = '\0';
}
else
{
dumpWhiteSpace = true;
}
continue;
}
else if (character == '\u00A0')
{
// NBSP:
characters[i] = ' ';
}
else if (character == '\r')
{
characters[i] = '\0';
dumpWhiteSpace = true;
continue;
}
else if (character == '\n')
{
dumpWhiteSpace = true;
continue;
}
dumpWhiteSpace = false;
}
}
else
{
// \r and nbsp only.
for (int i = 0; i < characters.Length; i++)
{
char character = characters[i];
if (character == '\r')
{
characters[i] = '\0';
}
else if (character == '\u00A0')
{
// NBSP:
characters[i] = ' ';
}
}
}
// Create characters if they're needed:
if (Characters == null || Characters.Length != characters.Length)
{
Characters = new Glyph[characters.Length];
Kerning = null;
}
// Considered all empty until shown otherwise.
AllEmpty = true;
// Next, for each character, find its dynamic character.
// At the same time we want to find out what dimensions this word has so it can be located correctly.
Glyph previous = null;
for (int i = 0; i < characters.Length; i++)
{
char rawChar = characters[i];
if (rawChar == '\0')
{
// It got dumped.
continue;
}
Glyph character = null;
// Is it a unicode high/low surrogate pair?
if (char.IsHighSurrogate(rawChar) && i != characters.Length - 1)
{
// Low surrogate follows:
char lowChar = characters[i + 1];
// Get the full charcode:
int charcode = char.ConvertToUtf32(rawChar, lowChar);
// Grab the surrogate pair char:
character = FontToDraw.GetGlyphOrEmoji(charcode);
// Make sure there is no char in the low surrogate spot:
Characters[i + 1] = null;
// Update this character:
Characters[i] = character;
// Skip the low surrogate:
i++;
}
else if (rawChar == '\n')
{
// Special case for newlines (They don't show up in host fonts).
if (NEWLINE_GLYPH == null)
{
NEWLINE_GLYPH = new Glyph();
NEWLINE_GLYPH.RawCharcode = (int)'\n';
}
Characters[i] = NEWLINE_GLYPH;
}
else
{
character = FontToDraw.GetGlyphOrEmoji((int)rawChar);
Characters[i] = character;
}
if (character == null)
{
continue;
}
if (previous != null)
{
// Look for a kern pair:
if (character.Kerning != null)
{
float offset;
if (character.Kerning.TryGetValue(previous, out offset))
{
// Got a kern!
if (Kerning == null)
{
Kerning = new float[characters.Length];
}
Kerning[i] = offset;
}
}
}
previous = character;
AllEmpty = false;
}
}
/// <summary>Runs before reflow.</summary>
public override void UpdateCss(Renderman renderer)
{
// Clear the blocks:
FirstBox = null;
LastBox = null;
// Get the text renderer (or create it):
Css.TextRenderingProperty text = RequireTextProperty();
// Get computed style:
ComputedStyle cs = computedStyle;
// Get the first box as it contains the fontface/ size:
LayoutBox box = cs.FirstBox;
// Colour too:
Color fontColour = cs.Resolve(Css.Properties.ColorProperty.GlobalProperty).GetColour(this, Css.Properties.ColorProperty.GlobalProperty);
// Colour:
text.BaseColour = fontColour;
// Font size update:
float fontSize = box.FontSize;
text.FontSize = fontSize;
// Spacing:
float wordSpacing = cs.ResolveDecimal(Css.Properties.WordSpacing.GlobalProperty);
float letterSpacing = cs.ResolveDecimal(Css.Properties.LetterSpacing.GlobalProperty);
// If word spacing is not 'normal', remove 1em from it (Note that letter spacing is always additive):
if (wordSpacing == -1f)
{
wordSpacing = 0f;
}
else
{
wordSpacing -= fontSize;
}
text.WordSpacing = wordSpacing;
text.LetterSpacing = letterSpacing;
// Decoration:
int decoration = cs.ResolveInt(Css.Properties.TextDecorationLine.GlobalProperty);
if (decoration == 0)
{
// Remove a line if we have one:
text.TextLine = null;
}
else
{
// Got a line!
if (text.TextLine == null)
{
text.TextLine = new TextDecorationInfo(decoration);
}
// Get the colour:
Css.Value lineColour = cs.Resolve(Css.Properties.TextDecorationColor.GlobalProperty);
if (lineColour == null || lineColour.IsType(typeof(Css.Keywords.CurrentColor)))
{
// No override:
text.TextLine.ColourOverride = false;
}
else
{
// Set the colour:
text.TextLine.SetColour(lineColour.GetColour(this, Css.Properties.TextDecorationColor.GlobalProperty));
}
}
// Get the font face:
text.FontToDraw = box.FontFace;
// Overflow-wrap mode (only active for 'break-word' which is just '1'):
text.OverflowWrapActive = (cs.ResolveInt(Css.Properties.OverflowWrap.GlobalProperty) == 1);
// Check if the text is 'dirty'.
// If it is, that means we'll need to rebuild the TextRenderingProperty's Glyph array.
if (text.Dirty)
{
// Setup text now:
// (Resets text.Characters based on all the text related CSS properties like variant etc).
text.LoadCharacters((Node as RenderableTextNode).characterData_, this);
}
if (text.Characters == null || text.AllEmpty)
{
text.FontSize = 0f;
return;
}
}