public static async Task <ExportResult> ExportSvgAsync(
ExportStyle style,
InstalledFont selectedFont,
FontVariant selectedVariant,
Character selectedChar,
CanvasTextLayoutAnalysis analysis,
CanvasTypography typography)
{
try
{
string name = GetFileName(selectedFont, selectedVariant, selectedChar, "svg");
if (await PickFileAsync(name, "SVG", new[] { ".svg" }) is StorageFile file)
{
CachedFileManager.DeferUpdates(file);
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 && analysis.HasColorGlyphs && !analysis.GlyphFormats.Contains(GlyphImageFormat.Svg))
{
NativeInterop interop = Utils.GetInterop();
List <string> paths = new List <string>();
Rect bounds = Rect.Empty;
foreach (var thing in analysis.Indicies)
{
var path = interop.GetPathDatas(selectedVariant.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, analysis.Colors, invertBounds: false))
{
await Utils.WriteSvgAsync(document, file);
}
return(new ExportResult(true, file));
}
var data = GetGeometry(1024, selectedVariant, selectedChar, analysis, typography);
async Task SaveMonochromeAsync()
{
using CanvasSvgDocument document = Utils.GenerateSvgDocument(device, data.Bounds, data.Path, textColor);
await Utils.WriteSvgAsync(document, file);
}
// If the font uses SVG glyphs, we can extract the raw SVG from the font file
if (analysis.GlyphFormats.Contains(GlyphImageFormat.Svg))
{
string str = null;
IBuffer b = GetGlyphBuffer(selectedVariant.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));
}
await Utils.WriteSvgAsync(document, file);
}
}
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
await SaveMonochromeAsync();
}
}
else
{
await SaveMonochromeAsync();
}
await CachedFileManager.CompleteUpdatesAsync(file);
return(new ExportResult(true, file));
}
}
catch (Exception ex)
{
await SimpleIoc.Default.GetInstance <IDialogService>()
.ShowMessageBox(ex.Message, Localization.Get("SaveImageError"));
}
return(new ExportResult(false, null));
}
public static async Task ExportSvgAsync(
ExportStyle style,
InstalledFont selectedFont,
FontVariant selectedVariant,
Character selectedChar,
CanvasTypography typography)
{
try
{
string name = GetFileName(selectedFont, selectedVariant, selectedChar, "svg");
if (await PickFileAsync(name, "SVG", new[] { ".svg" }) is StorageFile file)
{
CachedFileManager.DeferUpdates(file);
var device = Utils.CanvasDevice;
var textColor = style == ExportStyle.Black ? Colors.Black : Colors.White;
/* SVG Exports render at fixed size - but a) they're vectors, and b) they're
* inside an auto-scaling viewport. So rendersize is *largely* pointless */
float canvasH = 1024f, canvasW = 1024f, fontSize = 1024f;
using (CanvasTextLayout layout = new CanvasTextLayout(device, $"{selectedChar.Char}", new CanvasTextFormat
{
FontSize = fontSize,
FontFamily = selectedVariant.Source,
FontStretch = selectedVariant.FontFace.Stretch,
FontWeight = selectedVariant.FontFace.Weight,
FontStyle = selectedVariant.FontFace.Style,
HorizontalAlignment = CanvasHorizontalAlignment.Center
}, canvasW, canvasH))
{
layout.SetTypography(0, 1, typography);
using (CanvasGeometry temp = CanvasGeometry.CreateText(layout))
{
var b = temp.ComputeBounds();
double scale = Math.Min(1, Math.Min(canvasW / b.Width, canvasH / b.Height));
Matrix3x2 transform =
Matrix3x2.CreateTranslation(new Vector2((float)-b.Left, (float)-b.Top))
* Matrix3x2.CreateScale(new Vector2((float)scale));
using (CanvasGeometry geom = temp.Transform(transform))
{
/*
* Unfortunately this only constructs a monochrome path, if we want color
* Win2D does not yet expose the neccessary API's to get the individual glyph
* layers that make up a colour glyph.
*
* We'll need to handle this in C++/CX if we want to do this at some point.
*/
SVGPathReciever rc = new SVGPathReciever();
geom.SendPathTo(rc);
Rect bounds = geom.ComputeBounds();
using (CanvasSvgDocument document = Utils.GenerateSvgDocument(device, bounds.Width, bounds.Height, rc))
{
((CanvasSvgNamedElement)document.Root.FirstChild).SetColorAttribute("fill", textColor);
await Utils.WriteSvgAsync(document, file);
}
}
}
}
await CachedFileManager.CompleteUpdatesAsync(file);
}
}
catch (Exception ex)
{
await SimpleIoc.Default.GetInstance <IDialogService>()
.ShowMessageBox(ex.Message, Localization.Get("SaveImageError"));
}
}