public static CanvasGeometry CreateGeometry(
Character selectedChar,
CharacterRenderingOptions options)
{
CanvasDevice device = Utils.CanvasDevice;
/* SVG Exports render at fixed size - but a) they're vectors, and b) they're
* inside an auto-scaling viewport. So render-size is *largely* pointless */
float canvasH = options.FontSize, canvasW = options.FontSize, fontSize = options.FontSize;
using var typography = options.CreateCanvasTypography();
using (CanvasTextLayout layout = new CanvasTextLayout(device, $"{selectedChar.Char}", new CanvasTextFormat
{
FontSize = fontSize,
FontFamily = options.Variant.Source,
FontStretch = options.Variant.FontFace.Stretch,
FontWeight = options.Variant.FontFace.Weight,
FontStyle = options.Variant.FontFace.Style,
HorizontalAlignment = CanvasHorizontalAlignment.Center
}, canvasW, canvasH))
{
layout.SetTypography(0, 1, typography);
layout.Options = options.Analysis.GlyphFormats.Contains(GlyphImageFormat.Svg) ? CanvasDrawTextOptions.EnableColorFont : CanvasDrawTextOptions.Default;
return(CanvasGeometry.CreateText(layout));
}
}
public static async Task <ExportResult> ExportSvgAsync(
ExportStyle style,
InstalledFont selectedFont,
CharacterRenderingOptions options,
Character selectedChar)
{
try
{
// We want to prepare geometry at 1024px, so force this
options = options with {
FontSize = 1024
};
using var typography = options.CreateCanvasTypography();
// Get save file
string name = GetFileName(selectedFont, options.Variant, selectedChar, "svg");
if (await PickFileAsync(name, "SVG", new[] { ".svg" }) is StorageFile file)
{
try
{
CachedFileManager.DeferUpdates(file);
// Generate SVG doc and write to file
await Utils.WriteSvgAsync(GetSVG(style, options, selectedChar), file);
return(new ExportResult(true, file));
}
finally
{
await CachedFileManager.CompleteUpdatesAsync(file);
}
}
}
catch (Exception ex)
{
await Ioc.Default.GetService <IDialogService>()
.ShowMessageAsync(ex.Message, Localization.Get("SaveImageError"));
}
return(new ExportResult(false, null));
}
public static string GetSVG(
ExportStyle style,
CharacterRenderingOptions options,
Character selectedChar)
{
// We want to prepare geometry at 1024px, so force this
options = options with {
FontSize = 1024
};
using var typography = options.CreateCanvasTypography();
CanvasDevice device = Utils.CanvasDevice;
Color textColor = style == ExportStyle.Black ? Colors.Black : Colors.White;
// If COLR format (e.g. Segoe UI Emoji), we have special export path.
if (style == ExportStyle.ColorGlyph && options.Analysis.HasColorGlyphs && !options.Analysis.GlyphFormats.Contains(GlyphImageFormat.Svg))
{
NativeInterop interop = Utils.GetInterop();
List <string> paths = new List <string>();
Rect bounds = Rect.Empty;
// Try to find the bounding box of all glyph layers combined
foreach (var thing in options.Analysis.Indicies)
{
var path = interop.GetPathDatas(options.Variant.FontFace, thing.ToArray()).First();
paths.Add(path.Path);
if (!path.Bounds.IsEmpty)
{
var left = Math.Min(bounds.Left, path.Bounds.Left);
var top = Math.Min(bounds.Top, path.Bounds.Top);
var right = Math.Max(bounds.Right, path.Bounds.Right);
var bottom = Math.Max(bounds.Bottom, path.Bounds.Bottom);
bounds = new Rect(
left,
top,
right - left,
bottom - top);
}
}
using CanvasSvgDocument document = Utils.GenerateSvgDocument(device, bounds, paths, options.Analysis.Colors, invertBounds: false);
return(document.GetXml());
}
var data = GetGeometry(selectedChar, options);
string GetMonochrome()
{
using CanvasSvgDocument document = string.IsNullOrWhiteSpace(data.Path)
? new CanvasSvgDocument(Utils.CanvasDevice)
: Utils.GenerateSvgDocument(device, data.Bounds, data.Path, textColor);
return(document.GetXml());
}
// If the font uses SVG glyphs, we can extract the raw SVG from the font file
if (options.Analysis.GlyphFormats.Contains(GlyphImageFormat.Svg))
{
string str = null;
IBuffer b = GetGlyphBuffer(options.Variant.FontFace, selectedChar.UnicodeIndex, GlyphImageFormat.Svg);
if (b.Length > 2 && b.GetByte(0) == 31 && b.GetByte(1) == 139)
{
using var stream = b.AsStream();
using var gzip = new GZipStream(stream, CompressionMode.Decompress);
using var reader = new StreamReader(gzip);
str = reader.ReadToEnd();
}
else
{
using var dataReader = DataReader.FromBuffer(b);
dataReader.UnicodeEncoding = Windows.Storage.Streams.UnicodeEncoding.Utf8;
str = dataReader.ReadString(b.Length);
}
if (str.StartsWith("<?xml"))
{
str = str.Remove(0, str.IndexOf(">") + 1);
}
str = str.TrimStart();
try
{
using (CanvasSvgDocument document = CanvasSvgDocument.LoadFromXml(Utils.CanvasDevice, str))
{
// We need to transform the SVG to fit within the default document bounds, as characters
// are based *above* the base origin of (0,0) as (0,0) is the Baseline (bottom left) position for a character,
// so by default a will appear out of bounds of the default SVG viewport (towards top left).
//if (!document.Root.IsAttributeSpecified("viewBox")) // Specified viewbox requires baseline transform?
{
// We'll regroup all the elements inside a "g" / group tag,
// and apply a transform to the "g" tag to try and put in
// in the correct place. There's probably a more accurate way
// to do this by directly setting the root viewBox, if anyone
// can find the correct calculation...
List <ICanvasSvgElement> elements = new List <ICanvasSvgElement>();
double minTop = 0;
double minLeft = double.MaxValue;
double maxWidth = double.MinValue;
double maxHeight = double.MinValue;
void ProcessChildren(CanvasSvgNamedElement root)
{
CanvasSvgNamedElement ele = root.FirstChild as CanvasSvgNamedElement;
while (true)
{
CanvasSvgNamedElement next = root.GetNextSibling(ele) as CanvasSvgNamedElement;
if (ele.Tag == "g")
{
ProcessChildren(ele);
}
else if (ele.Tag == "path")
{
// Create a XAML geometry to try and find the bounds of each character
// Probably more efficient to do in Win2D, but far less code to do with XAML.
Geometry gm = XamlBindingHelper.ConvertValue(typeof(Geometry), ele.GetStringAttribute("d")) as Geometry;
minTop = Math.Min(minTop, gm.Bounds.Top);
minLeft = Math.Min(minLeft, gm.Bounds.Left);
maxWidth = Math.Max(maxWidth, gm.Bounds.Width);
maxHeight = Math.Max(maxHeight, gm.Bounds.Height);
}
ele = next;
if (ele == null)
{
break;
}
}
}
ProcessChildren(document.Root);
double top = minTop < 0 ? minTop : 0;
double left = minLeft;
document.Root.SetRectangleAttribute("viewBox", new Rect(left, top, data.Bounds.Width, data.Bounds.Height));
}
return(document.GetXml());
}
}
catch
{
// Certain fonts seem to have their SVG glyphs encoded with... I don't even know what encoding.
// for example: https://github.com/adobe-fonts/emojione-color
// In these cases, fallback to monochrome black
return(GetMonochrome());
}
}
else
{
return(GetMonochrome());
}
}
public static async Task <ExportResult> ExportPngAsync(
ExportStyle style,
InstalledFont selectedFont,
CharacterRenderingOptions options,
Character selectedChar,
AppSettings settings)
{
try
{
using var typography = options.CreateCanvasTypography();
string name = GetFileName(selectedFont, options.Variant, selectedChar, "png");
if (await PickFileAsync(name, "PNG Image", new[] { ".png" }) is StorageFile file)
{
CachedFileManager.DeferUpdates(file);
if (options.Analysis.GlyphFormats.Contains(GlyphImageFormat.Png))
{
IBuffer buffer = GetGlyphBuffer(options.Variant.FontFace, selectedChar.UnicodeIndex, GlyphImageFormat.Png);
await FileIO.WriteBufferAsync(file, buffer);
}
else
{
var device = Utils.CanvasDevice;
var localDpi = 96; //Windows.Graphics.Display.DisplayInformation.GetForCurrentView().LogicalDpi;
var canvasH = (float)settings.PngSize;
var canvasW = (float)settings.PngSize;
using var renderTarget = new CanvasRenderTarget(device, canvasW, canvasH, localDpi);
using (var ds = renderTarget.CreateDrawingSession())
{
ds.Clear(Colors.Transparent);
var d = settings.PngSize;
var r = settings.PngSize / 2;
var textColor = style == ExportStyle.Black ? Colors.Black : Colors.White;
var fontSize = (float)d;
using CanvasTextLayout layout = new CanvasTextLayout(device, $"{selectedChar.Char}", new CanvasTextFormat
{
FontSize = fontSize,
FontFamily = options.Variant.Source,
FontStretch = options.Variant.FontFace.Stretch,
FontWeight = options.Variant.FontFace.Weight,
FontStyle = options.Variant.FontFace.Style,
HorizontalAlignment = CanvasHorizontalAlignment.Center,
Options = style == ExportStyle.ColorGlyph ? CanvasDrawTextOptions.EnableColorFont : CanvasDrawTextOptions.Default
}, canvasW, canvasH);
if (style == ExportStyle.ColorGlyph)
{
layout.Options = CanvasDrawTextOptions.EnableColorFont;
}
layout.SetTypography(0, 1, typography);
var db = layout.DrawBounds;
double scale = Math.Min(1, Math.Min(canvasW / db.Width, canvasH / db.Height));
var x = -db.Left + ((canvasW - (db.Width * scale)) / 2d);
var y = -db.Top + ((canvasH - (db.Height * scale)) / 2d);
ds.Transform =
Matrix3x2.CreateTranslation(new Vector2((float)x, (float)y))
* Matrix3x2.CreateScale(new Vector2((float)scale));
ds.DrawTextLayout(layout, new Vector2(0), textColor);
}
using var fileStream = await file.OpenAsync(FileAccessMode.ReadWrite);
fileStream.Size = 0;
await renderTarget.SaveAsync(fileStream, CanvasBitmapFileFormat.Png, 1f);
}
await CachedFileManager.CompleteUpdatesAsync(file);
return(new ExportResult(true, file));
}
}
catch (Exception ex)
{
await Ioc.Default.GetService <IDialogService>()
.ShowMessageAsync(ex.Message, Localization.Get("SaveImageError"));
}
return(new ExportResult(false, null));
}
