/// <summary>
/// Internal function returning the text element character for the given unicode value taking into consideration the font style and weight.
/// Function searches the source font asset, list of font assets assigned as alternative typefaces and list of fallback font assets.
/// </summary>
private static TMP_Character GetCharacterFromFontAsset_Internal(uint unicode, TMP_FontAsset sourceFontAsset, bool includeFallbacks, FontStyles fontStyle, FontWeight fontWeight, out bool isAlternativeTypeface, out TMP_FontAsset fontAsset)
{
fontAsset = null;
isAlternativeTypeface = false;
TMP_Character characterData = null;
#region FONT WEIGHT AND FONT STYLE HANDLING
// Determine if a font weight or style is used. If so check if an alternative typeface is assigned for the given weight and / or style.
bool isItalic = (fontStyle & FontStyles.Italic) == FontStyles.Italic;
if (isItalic || fontWeight != FontWeight.Regular)
{
// Get reference to the font weight pairs of the given font asset.
TMP_FontWeightPair[] fontWeights = sourceFontAsset.fontWeightTable;
int fontWeightIndex = 4;
switch (fontWeight)
{
case FontWeight.Thin:
fontWeightIndex = 1;
break;
case FontWeight.ExtraLight:
fontWeightIndex = 2;
break;
case FontWeight.Light:
fontWeightIndex = 3;
break;
case FontWeight.Regular:
fontWeightIndex = 4;
break;
case FontWeight.Medium:
fontWeightIndex = 5;
break;
case FontWeight.SemiBold:
fontWeightIndex = 6;
break;
case FontWeight.Bold:
fontWeightIndex = 7;
break;
case FontWeight.Heavy:
fontWeightIndex = 8;
break;
case FontWeight.Black:
fontWeightIndex = 9;
break;
}
fontAsset = isItalic ? fontWeights[fontWeightIndex].italicTypeface : fontWeights[fontWeightIndex].regularTypeface;
if (fontAsset != null)
{
if (fontAsset.characterLookupTable.TryGetValue(unicode, out characterData))
{
isAlternativeTypeface = true;
return(characterData);
}
else if (fontAsset.atlasPopulationMode == AtlasPopulationMode.Dynamic)
{
if (fontAsset.TryAddCharacterInternal(unicode, out characterData))
{
isAlternativeTypeface = true;
return(characterData);
}
// Check if the source font file contains the requested character.
//if (TryGetCharacterFromFontFile(unicode, fontAsset, out characterData))
//{
// isAlternativeTypeface = true;
// return characterData;
//}
// If we find the requested character, we add it to the font asset character table
// and return its character data.
// We also add this character to the list of characters we will need to add to the font atlas.
// We assume the font atlas has room otherwise this font asset should not be marked as dynamic.
// Alternatively, we could also add multiple pages of font atlas textures (feature consideration).
}
// At this point, we were not able to find the requested character in the alternative typeface
// so we check the source font asset and its potential fallbacks.
}
}
#endregion
// Search the source font asset for the requested character.
if (sourceFontAsset.characterLookupTable.TryGetValue(unicode, out characterData))
{
// We were able to locate the requested character in the given font asset.
fontAsset = sourceFontAsset;
return(characterData);
}
else if (sourceFontAsset.atlasPopulationMode == AtlasPopulationMode.Dynamic)
{
if (sourceFontAsset.TryAddCharacterInternal(unicode, out characterData))
{
fontAsset = sourceFontAsset;
return(characterData);
}
//// Check if the source font file contains the requested character.
//if (TryGetCharacterFromFontFile(unicode, sourceFontAsset, out characterData))
//{
// fontAsset = sourceFontAsset;
// //fontAsset.AddCharacterToRasterList(unicode);
// return characterData;
//}
// If we find the requested character, we add it to the font asset character table
// and return its character data.
// We also add this character to the list of characters we will need to add to the font atlas.
// We assume the font atlas has room otherwise this font asset should not be marked as dynamic.
// Alternatively, we could also add multiple pages of font atlas textures (feature consideration)
}
// Search fallback font assets if we still don't have a valid character and include fallback is set to true.
if (characterData == null && includeFallbacks && sourceFontAsset.fallbackFontAssetTable != null)
{
// Get reference to the list of fallback font assets.
List <TMP_FontAsset> fallbackFontAssets = sourceFontAsset.fallbackFontAssetTable;
int fallbackCount = fallbackFontAssets.Count;
if (fallbackFontAssets != null && fallbackCount > 0)
{
for (int i = 0; i < fallbackCount && characterData == null; i++)
{
TMP_FontAsset temp = fallbackFontAssets[i];
if (temp == null)
{
continue;
}
int id = temp.GetInstanceID();
// Skip over the fallback font asset in the event it is null or if already searched.
if (k_SearchedFontAssets.Contains(id))
{
continue;
}
// Add to list of font assets already searched.
k_SearchedFontAssets.Add(id);
characterData = GetCharacterFromFontAsset_Internal(unicode, temp, includeFallbacks, fontStyle, fontWeight, out isAlternativeTypeface, out fontAsset);
if (characterData != null)
{
return(characterData);
}
}
}
}
return(null);
}
