/// <summary>
/// Maps a given style to a specific typeface
/// </summary>
/// <param name="style">The style to be mapped</param>
/// <param name="ignoreFontVariants">Indicates the mapping should ignore font variants (use to get font for ellipsis)</param>
/// <returns>A mapped typeface</returns>
public virtual SKTypeface TypefaceFromStyle(IStyle style, bool ignoreFontVariants)
{
// Extra weight for superscript/subscript
int extraWeight = 0;
if (!ignoreFontVariants && (style.FontVariant == FontVariant.SuperScript || style.FontVariant == FontVariant.SubScript))
{
extraWeight += 100;
}
// Get the typeface
return(SKTypeface.FromFamilyName(
style.FontFamily,
(SKFontStyleWeight)(style.FontWeight + extraWeight),
0,
style.FontItalic ? SKFontStyleSlant.Italic : SKFontStyleSlant.Upright
) ?? SKTypeface.CreateDefault());
}
static Font()
{
//TODO:编译条件确认是否使用默认中文字体
var typeface = SKFontManager.Default.MatchCharacter('中');
if (typeface == null)
{
//使用默认Noto字体
typeface = SKFontManager.Default.CreateTypeface(NotoFont);
if (typeface == null)
{
typeface = SKTypeface.CreateDefault();
}
else
{
DefaultFontIsNoto = true;
}
}
DefaultFontFamilyName = typeface.FamilyName;
typeface.Dispose();
}
private static string CreateDefaultFamilyName()
{
var defaultTypeface = SKTypeface.CreateDefault();
return(defaultTypeface.FamilyName);
}
private SKBitmap BuildThumbCollageBitmap(string[] paths, int width, int height, string?libraryName)
{
var bitmap = new SKBitmap(width, height);
using var canvas = new SKCanvas(bitmap);
canvas.Clear(SKColors.Black);
using var backdrop = GetNextValidImage(paths, 0, out _);
if (backdrop == null)
{
return(bitmap);
}
// resize to the same aspect as the original
var backdropHeight = Math.Abs(width * backdrop.Height / backdrop.Width);
using var residedBackdrop = SkiaEncoder.ResizeImage(backdrop, new SKImageInfo(width, backdropHeight, backdrop.ColorType, backdrop.AlphaType, backdrop.ColorSpace));
// draw the backdrop
canvas.DrawImage(residedBackdrop, 0, 0);
// draw shadow rectangle
var paintColor = new SKPaint
{
Color = SKColors.Black.WithAlpha(0x78),
Style = SKPaintStyle.Fill
};
canvas.DrawRect(0, 0, width, height, paintColor);
var typeFace = SKTypeface.FromFamilyName("sans-serif", SKFontStyleWeight.Bold, SKFontStyleWidth.Normal, SKFontStyleSlant.Upright) ?? SKTypeface.CreateDefault();
// use the system fallback to find a typeface for the given CJK character
var nonCjkPattern = @"[^\p{IsCJKUnifiedIdeographs}\p{IsCJKUnifiedIdeographsExtensionA}\p{IsKatakana}\p{IsHiragana}\p{IsHangulSyllables}\p{IsHangulJamo}]";
var filteredName = Regex.Replace(libraryName ?? string.Empty, nonCjkPattern, string.Empty);
if (!string.IsNullOrEmpty(filteredName))
{
typeFace = SKFontManager.Default.MatchCharacter(null, SKFontStyleWeight.Bold, SKFontStyleWidth.Normal, SKFontStyleSlant.Upright, null, filteredName[0]);
}
// draw library name
var textPaint = new SKPaint
{
Color = SKColors.White,
Style = SKPaintStyle.Fill,
TextSize = 112,
TextAlign = SKTextAlign.Center,
Typeface = typeFace,
IsAntialias = true
};
// scale down text to 90% of the width if text is larger than 95% of the width
var textWidth = textPaint.MeasureText(libraryName);
if (textWidth > width * 0.95)
{
textPaint.TextSize = 0.9f * width * textPaint.TextSize / textWidth;
}
canvas.DrawText(libraryName, width / 2f, (height / 2f) + (textPaint.FontMetrics.XHeight / 2), textPaint);
return(bitmap);
}