/// <summary>
/// Returns the text element (character) for the given unicode value taking into consideration the requested font style and weight.
/// Function searches the provided list of font assets, the list of font assets assigned as alternative typefaces to them as well as their fallbacks.
/// The font asset out parameter contains a reference to the font asset containing the character.
/// The typeface type indicates whether the returned font asset is the source font asset, an alternative typeface or fallback font asset.
/// </summary>
/// <param name="unicode">The unicode value of the requested character</param>
/// <param name="sourceFontAsset">The font asset originating the search query</param>
/// <param name="fontAssets">The list of font assets to search</param>
/// <param name="includeFallbacks">Determines if the fallback of each font assets on the list will be searched</param>
/// <param name="fontStyle">The font style</param>
/// <param name="fontWeight">The font weight</param>
/// <param name="isAlternativeTypeface">Determines if the OUT font asset is an alternative typeface or fallback font asset</param>
/// <returns></returns>
public static Character GetCharacterFromFontAssets(uint unicode, FontAsset sourceFontAsset, List <FontAsset> fontAssets, bool includeFallbacks, FontStyles fontStyle, TextFontWeight fontWeight, out bool isAlternativeTypeface)
{
isAlternativeTypeface = false;
// Make sure font asset list is valid
if (fontAssets == null || fontAssets.Count == 0)
{
return(null);
}
if (includeFallbacks)
{
if (k_SearchedAssets == null)
{
k_SearchedAssets = new HashSet <int>();
}
else
{
k_SearchedAssets.Clear();
}
}
int fontAssetCount = fontAssets.Count;
for (int i = 0; i < fontAssetCount; i++)
{
FontAsset fontAsset = fontAssets[i];
if (fontAsset == null)
{
continue;
}
// Add reference to this search query
//sourceFontAsset.FallbackSearchQueryLookup.Add(fontAsset.instanceID);
Character character = GetCharacterFromFontAsset_Internal(unicode, fontAsset, includeFallbacks, fontStyle, fontWeight, out isAlternativeTypeface);
if (character != null)
{
return(character);
}
}
return(null);
}
/// <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 Character GetCharacterFromFontAsset_Internal(uint unicode, FontAsset sourceFontAsset, bool includeFallbacks, FontStyles fontStyle, TextFontWeight fontWeight, out bool isAlternativeTypeface)
{
isAlternativeTypeface = false;
Character character = 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 != TextFontWeight.Regular)
{
// Get reference to the font weight pairs of the given font asset.
FontWeightPair[] fontWeights = sourceFontAsset.fontWeightTable;
int fontWeightIndex = 4;
switch (fontWeight)
{
case TextFontWeight.Thin:
fontWeightIndex = 1;
break;
case TextFontWeight.ExtraLight:
fontWeightIndex = 2;
break;
case TextFontWeight.Light:
fontWeightIndex = 3;
break;
case TextFontWeight.Regular:
fontWeightIndex = 4;
break;
case TextFontWeight.Medium:
fontWeightIndex = 5;
break;
case TextFontWeight.SemiBold:
fontWeightIndex = 6;
break;
case TextFontWeight.Bold:
fontWeightIndex = 7;
break;
case TextFontWeight.Heavy:
fontWeightIndex = 8;
break;
case TextFontWeight.Black:
fontWeightIndex = 9;
break;
}
FontAsset temp = isItalic ? fontWeights[fontWeightIndex].italicTypeface : fontWeights[fontWeightIndex].regularTypeface;
if (temp != null)
{
if (temp.characterLookupTable.TryGetValue(unicode, out character))
{
isAlternativeTypeface = true;
return(character);
}
if (temp.atlasPopulationMode == AtlasPopulationMode.Dynamic || temp.atlasPopulationMode == AtlasPopulationMode.DynamicOS)
{
if (temp.TryAddCharacterInternal(unicode, out character))
{
isAlternativeTypeface = true;
return(character);
}
// 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 character))
{
return(character);
}
if (sourceFontAsset.atlasPopulationMode == AtlasPopulationMode.Dynamic || sourceFontAsset.atlasPopulationMode == AtlasPopulationMode.DynamicOS)
{
if (sourceFontAsset.TryAddCharacterInternal(unicode, out character))
{
return(character);
}
}
// Search fallback font assets if we still don't have a valid character and include fallback is set to true.
if (character == null && includeFallbacks && sourceFontAsset.fallbackFontAssetTable != null)
{
// Get reference to the list of fallback font assets.
List <FontAsset> fallbackFontAssets = sourceFontAsset.fallbackFontAssetTable;
int fallbackCount = fallbackFontAssets.Count;
if (fallbackCount == 0)
{
return(null);
}
for (int i = 0; i < fallbackCount; i++)
{
FontAsset temp = fallbackFontAssets[i];
if (temp == null)
{
continue;
}
int id = temp.instanceID;
// Try adding font asset to search list. If already present skip to the next one otherwise check if it contains the requested character.
if (k_SearchedAssets.Add(id) == false)
{
continue;
}
// Add reference to this search query
//sourceFontAsset.FallbackSearchQueryLookup.Add(id);
character = GetCharacterFromFontAsset_Internal(unicode, temp, true, fontStyle, fontWeight, out isAlternativeTypeface);
if (character != null)
{
return(character);
}
}
}
return(null);
}
internal static Character GetCharacterFromFontAsset(uint unicode, FontAsset sourceFontAsset, bool includeFallbacks, FontStyles fontStyle, TextFontWeight fontWeight, out bool isAlternativeTypeface)
{
if (includeFallbacks)
{
if (k_SearchedAssets == null)
{
k_SearchedAssets = new HashSet <int>();
}
else
{
k_SearchedAssets.Clear();
}
}
return(GetCharacterFromFontAsset_Internal(unicode, sourceFontAsset, includeFallbacks, fontStyle, fontWeight, out isAlternativeTypeface));
}
